CA2490529C - Repeater with digital channelizer - Google Patents
Repeater with digital channelizer Download PDFInfo
- Publication number
- CA2490529C CA2490529C CA2490529A CA2490529A CA2490529C CA 2490529 C CA2490529 C CA 2490529C CA 2490529 A CA2490529 A CA 2490529A CA 2490529 A CA2490529 A CA 2490529A CA 2490529 C CA2490529 C CA 2490529C
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- signal
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0294—Variable filters; Programmable filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
- H04B1/001—Channel filtering, i.e. selecting a frequency channel within the SDR system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
Abstract
In order to retransmit a communication channel at a specific frequency, a receiver (100) may receive a signal including the communication channel's specific frequency. An analog to digital converter (130) may generate a digital signal correlated to the received signal and the digital signal may be passed through a digital filter(140) configured to filter the digital signal and pass frequency components at or around the frequency of the communication channel's specific frequency. A digital to analog converter (150) may generate an analog signal correlated to the filtered digital signal and a transmitter may transmit the analog signal.
Description
REPEATER WITH DIGITAL CHANNELIZER
FIELD OF THE INVENTION
The present invention relates generally to the field of communications.
More specifically, the present invention relates to a repeater for a communication or transmission system (e.g. bi-directional cellular communication systems).
BACKGROUND
Degradation of signal-to-noise ratio ("SNR") occurs to a signal carried io along a transmission medium (e.g. coax, unshielded conductor, wave guide, open air or even optical fiber). SNR degradation is one factor which may limit bandwidth over a transmission medium. In order to improve the SNR of signals being transmitted over long distances, and accordingly to augment the transmission distance and/or data rate, signal repeaters may be placed at intervals along the transmitting path. Repeaters are well known and may be used for optical, microwave and radio frequency (RF) communication systems.
Repeaters have been used as part of cellular transmission systems to extend the range of coverage between a cellular base station and a cellular handset.
However, the use of a repeater for one or more channels at one or more frequencies within a shared frequency range of the spectrum (e.g. 800 MHz to 830 Mhz) may produce interference. Turning now to Fig. 1A, there is shown a spectral diagram exemplifying the channel frequencies a first cellular operator may be using within the frequency range of 800 to 830 MHz. Turning now to Fig.
1 B, there is shown a spectral diagram exemplifying the channel frequencies a second cellular operator in the same geographic location as the first may be using within the same frequency range, 800 to 830 MHz. As can be seen from the Figs. 1A and 113, each operator's channel frequencies may be distinct from the other. However, two or more channel frequencies of one operator may either be between two or more channel frequencies of the other operator or may be on either side one or more of the other operator's channel frequencies.
In order for an operator to use a repeater in the situation described above and exemplified in Figs. 1A and 113, the operator would either need a separate response for each channel, or the operator may use a broader band repeater to io cover a frequency range within which several of the operator's channels reside.
However, if a broader band repeater is used, the repeater may inadvertently retransmit one or more channels belonging to both operators. The retransmission of another operator's communication channel(s) has both legal and business implications which a cellular operator may prefer to avoid.
Analog channelized repeaters exist in the prior art. Channelized repeaters of the prior art use analog filters to exclude or filter out all signals or communication channels not belonging to the operator whose channels are to be repeated. For example, if the repeater's band of operation is 800 to 830 MHz, and the operator using the repeater has communication channels at 805 MHz, 807 MHz, and 809 MHz, the repeater may be equipped with analog filters which only allow or pass signals at the frequencies of the operator's channels. The analog channelized repeater thus retransmits only signals at the frequencies of the operator's communication channels.
FIELD OF THE INVENTION
The present invention relates generally to the field of communications.
More specifically, the present invention relates to a repeater for a communication or transmission system (e.g. bi-directional cellular communication systems).
BACKGROUND
Degradation of signal-to-noise ratio ("SNR") occurs to a signal carried io along a transmission medium (e.g. coax, unshielded conductor, wave guide, open air or even optical fiber). SNR degradation is one factor which may limit bandwidth over a transmission medium. In order to improve the SNR of signals being transmitted over long distances, and accordingly to augment the transmission distance and/or data rate, signal repeaters may be placed at intervals along the transmitting path. Repeaters are well known and may be used for optical, microwave and radio frequency (RF) communication systems.
Repeaters have been used as part of cellular transmission systems to extend the range of coverage between a cellular base station and a cellular handset.
However, the use of a repeater for one or more channels at one or more frequencies within a shared frequency range of the spectrum (e.g. 800 MHz to 830 Mhz) may produce interference. Turning now to Fig. 1A, there is shown a spectral diagram exemplifying the channel frequencies a first cellular operator may be using within the frequency range of 800 to 830 MHz. Turning now to Fig.
1 B, there is shown a spectral diagram exemplifying the channel frequencies a second cellular operator in the same geographic location as the first may be using within the same frequency range, 800 to 830 MHz. As can be seen from the Figs. 1A and 113, each operator's channel frequencies may be distinct from the other. However, two or more channel frequencies of one operator may either be between two or more channel frequencies of the other operator or may be on either side one or more of the other operator's channel frequencies.
In order for an operator to use a repeater in the situation described above and exemplified in Figs. 1A and 113, the operator would either need a separate response for each channel, or the operator may use a broader band repeater to io cover a frequency range within which several of the operator's channels reside.
However, if a broader band repeater is used, the repeater may inadvertently retransmit one or more channels belonging to both operators. The retransmission of another operator's communication channel(s) has both legal and business implications which a cellular operator may prefer to avoid.
Analog channelized repeaters exist in the prior art. Channelized repeaters of the prior art use analog filters to exclude or filter out all signals or communication channels not belonging to the operator whose channels are to be repeated. For example, if the repeater's band of operation is 800 to 830 MHz, and the operator using the repeater has communication channels at 805 MHz, 807 MHz, and 809 MHz, the repeater may be equipped with analog filters which only allow or pass signals at the frequencies of the operator's channels. The analog channelized repeater thus retransmits only signals at the frequencies of the operator's communication channels.
Analog channelized repeaters of the prior art have numerous drawbacks which the present invention aims to address.
SUMMARY OF THE INVENTION
As part of the present invention, a receiver may receive a signal associated with a certain communication channel at a specific frequency. An analog to digital converter may generate a digital signal correlated to the received signal and the digital signal may be passed through a digital filter configured to filter the digital signal and pass frequency components at or around 1o the frequency of the communication channel's specific frequency. A digital to analog converter may generate an analog signal correlated to the filtered digital signal and a transmitter may transmit the analog signal.
According to some embodiments of the present invention, there may be included a second digital filter configured to pass frequency components at or around a second frequency associated with a second communication channel.
According to some embodiments of the present invention, there may be included a down-converter to down-convert a received signal to an intermediate signal. An up-converter may also be included to up-convert to a transmission frequency an analog signal correlated to the filtered digital signal.
BRIEF DESCRIPTION OF THE DRAWINGS
The subject matter regarded as the invention is particularly pointed out and distinctly claimed in the concluding portion of the specification. The invention, however, both as to organization and method of operation, together with objects, features, and advantages thereof, may best be understood by reference to the following detailed description when read with the accompanying drawings in which:
Fig. 1A is a spectral diagram exemplifying four frequencies which may be used by a first cellular operator for four communication channels in a specific geographic region;
Figs. 1 B is a spectral diagram exemplifying three frequencies which may be used by a second cellular operator for three communication channels in a specific geographic region;
Fig. 2 is a block diagram showing an example of a bi-directional repeater with a digital channelizer according to some embodiment of the present invention;
Fig. 3 is a block diagram showing a more detailed view of the filter bank in Fig.
3;
Figs. 4A to 4D spectral diagrams showing examples of frequency responses of the digital filters 140A through 140D in Fig. 3; and Fig. 5 is a block diagram showing another example of a bi-directional repeater with a digital channelizer according to some embodiment of the present invention.
It will be appreciated that for simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous elements.
SUMMARY OF THE INVENTION
As part of the present invention, a receiver may receive a signal associated with a certain communication channel at a specific frequency. An analog to digital converter may generate a digital signal correlated to the received signal and the digital signal may be passed through a digital filter configured to filter the digital signal and pass frequency components at or around 1o the frequency of the communication channel's specific frequency. A digital to analog converter may generate an analog signal correlated to the filtered digital signal and a transmitter may transmit the analog signal.
According to some embodiments of the present invention, there may be included a second digital filter configured to pass frequency components at or around a second frequency associated with a second communication channel.
According to some embodiments of the present invention, there may be included a down-converter to down-convert a received signal to an intermediate signal. An up-converter may also be included to up-convert to a transmission frequency an analog signal correlated to the filtered digital signal.
BRIEF DESCRIPTION OF THE DRAWINGS
The subject matter regarded as the invention is particularly pointed out and distinctly claimed in the concluding portion of the specification. The invention, however, both as to organization and method of operation, together with objects, features, and advantages thereof, may best be understood by reference to the following detailed description when read with the accompanying drawings in which:
Fig. 1A is a spectral diagram exemplifying four frequencies which may be used by a first cellular operator for four communication channels in a specific geographic region;
Figs. 1 B is a spectral diagram exemplifying three frequencies which may be used by a second cellular operator for three communication channels in a specific geographic region;
Fig. 2 is a block diagram showing an example of a bi-directional repeater with a digital channelizer according to some embodiment of the present invention;
Fig. 3 is a block diagram showing a more detailed view of the filter bank in Fig.
3;
Figs. 4A to 4D spectral diagrams showing examples of frequency responses of the digital filters 140A through 140D in Fig. 3; and Fig. 5 is a block diagram showing another example of a bi-directional repeater with a digital channelizer according to some embodiment of the present invention.
It will be appreciated that for simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous elements.
DETAILED DESCRIPTION
In the following detailed, description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Unless specifically stated otherwise, as apparent from the following discussions, it is appreciated that throughout the specification discussions 1o utilizing terms such as "processing", "computing", "calculating", "determining", or the like, refer to the action and/or processes of a computer or computing system, or similar electronic computing device, that manipulate and/or transform data represented as physical, such as electronic, quantities within the computing system's registers and/or memories into other data similarly represented as physical quantities within the computing system's memories, registers or other such information storage, transmission or display devices.
Embodiments of the present invention may include apparatuses for performing the operations herein. This apparatus may be specially constructed for the desired purposes, or it may comprise a general purpose computer selectively activated or reconfigured by a computer program stored in the computer. Such a computer program may be stored in a computer readable storage medium, such as, but is not limited to, any type of disk including floppy disks, optical disks, CD-ROMs, magnetic-optical disks, read-only memories (ROMs), random access memories (RAMS) electrically programmable read-only memories (EPROMs), electrically erasable and programmable read only memories (EEPROMs), magnetic or optical cards, or any other type of media suitable for storing electronic instructions,-and capable of being coupled to a computer system bus.
The processes and displays presented herein are not inherently related to any particular computer or other apparatus. Various general purpose systems may be used with programs in accordance with the teachings herein, or it may prove convenient to construct a more specialized apparatus to perform the desired method. The desired structure for a variety of these systems will appear 1o from the description below. In addition, embodiments of the present invention are not described with reference to any particular programming language. It will be appreciated that a variety of programming languages may be used to implement the teachings of the inventions as described herein.
As part of the present invention, a receiver may receive a signal associated with a communication channel at a specific frequency. An analog to digital converter may generate a digital signal correlated to the received signal and the digital signal may be passed through a digital filter configured to filter the digital signal and pass frequency components at or around the frequency of the communication channel's specific frequency. A digital to analog converter may generate an analog signal correlated to the filtered digital signal and a transmitter may transmit the analog signal.
According to some embodiments of the present invention, there may be included a second digital filter configured to pass frequency components at or around a second frequency associated with a second communication channel.
In the following detailed, description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Unless specifically stated otherwise, as apparent from the following discussions, it is appreciated that throughout the specification discussions 1o utilizing terms such as "processing", "computing", "calculating", "determining", or the like, refer to the action and/or processes of a computer or computing system, or similar electronic computing device, that manipulate and/or transform data represented as physical, such as electronic, quantities within the computing system's registers and/or memories into other data similarly represented as physical quantities within the computing system's memories, registers or other such information storage, transmission or display devices.
Embodiments of the present invention may include apparatuses for performing the operations herein. This apparatus may be specially constructed for the desired purposes, or it may comprise a general purpose computer selectively activated or reconfigured by a computer program stored in the computer. Such a computer program may be stored in a computer readable storage medium, such as, but is not limited to, any type of disk including floppy disks, optical disks, CD-ROMs, magnetic-optical disks, read-only memories (ROMs), random access memories (RAMS) electrically programmable read-only memories (EPROMs), electrically erasable and programmable read only memories (EEPROMs), magnetic or optical cards, or any other type of media suitable for storing electronic instructions,-and capable of being coupled to a computer system bus.
The processes and displays presented herein are not inherently related to any particular computer or other apparatus. Various general purpose systems may be used with programs in accordance with the teachings herein, or it may prove convenient to construct a more specialized apparatus to perform the desired method. The desired structure for a variety of these systems will appear 1o from the description below. In addition, embodiments of the present invention are not described with reference to any particular programming language. It will be appreciated that a variety of programming languages may be used to implement the teachings of the inventions as described herein.
As part of the present invention, a receiver may receive a signal associated with a communication channel at a specific frequency. An analog to digital converter may generate a digital signal correlated to the received signal and the digital signal may be passed through a digital filter configured to filter the digital signal and pass frequency components at or around the frequency of the communication channel's specific frequency. A digital to analog converter may generate an analog signal correlated to the filtered digital signal and a transmitter may transmit the analog signal.
According to some embodiments of the present invention, there may be included a second digital filter configured to pass frequency components at or around a second frequency associated with a second communication channel.
According to some embodiments of the present invention, there may be included a down-converter to down-convert a received signal to an intermediate signal. An up-converter may also be included to up-convert to a transmission frequency an analog signal correlated to the filtered digital signal.
Turning now to Fig. 2, there is shown a block diagram of a bi-directional repeater 100 with a digital channelizer according to the present invention.
The bi-directional repeater 100 may include two basic sections: (A) an upstream or up-link section which receives signals from a mobile device (e.g. cell phone) and retransmits the signal to a base-station; and (B) a downstream or down-link 1o section which receives signals from a base-station and retransmits the signals to a mobile device.
Looking first at the up-link section (A) from left to right on Fig. 2, there may be an input filter 110U, which for this example, may be a radio frequency ("RF") filter, or more specifically, may be a filter tuned to pass frequencies in the range of 800 to 830 MHz, for example. The input RF filter 110U may receive signals from an antenna and may pass frequencies in the frequency range of one or more communication channels to be repeated to a down.converter 120U. The down converter 120U may mix a received signal with a sine or cosine wave of a given frequency such that the received signal is down-converted to an intermediate frequency ("IF"). Either the input RF filter 110U or the down converter 120U may include a signal amplifier (Not shown in Fig. 2). An analog to digital ("AID") converter 130U may sample the IF signal and may generate a digital signal representing the sampled IF signal. The digital signal representing the IF signal may enter digital filter bank 140U. Fig. 3 shows a more detailed view of digital filter bank 140U including digital filters 140a to 140d.
Turning now to Fig. 3, there is shown a block diagram of a digital filter bank 140U including digital filters 140a to 140d. A digital signal entering digital filter bank 140U may be applied to each of the digital filters 140a through 140d and the output of each of the digital filters may be combined by an adder 142 or by a functionally equivalent device. Each of the filters within the filter bank 140U
may have a separate and distinct frequency response. Digital filters are well known in the field of communications. Implementation of a digital filter bank may 1o be performed on a single or multiple processors (e.g. DSP) or may be implemented on a single or multiple dedicated digital filtering circuits. In the example of Fig. 3, there is shown four discrete digital filter circuits. As part of some embodiment of the present invention, digital filters 140a through 140d may be field programmable digital filters ("FPDF"). That is, each filter's transfer function, along with its frequency response, may be reprogrammed or adjusted.
Turning now to Figs. 4A through 4B, there are shown examples of possible frequency responses for digital filters 140a through 140d of Fig. 3, where digital filters 140a through 140b correspond to the first through the fourth communication channels exemplified in Fig. 1A, respectively. That is, the impulse response or frequency transfer characteristic for each digital filter 140a through 140d may be separately set or adjusted to pass frequency components of a digital signal that are at or around the carrier frequency of the filter's corresponding communication channel. For example; digital filter 140a may be programmed with a transfer function having a band pass frequency response peaking at or around the carrier frequency of the first communication channel shown in Fig. 1A; Digital filter 140b may be programmed with a transfer function having a band pass frequency response peaking at or around the carrier frequency of the second communication channel shown in Fig. 1A, etc...
The design of digital filters and digital filter transfer functions is well known. Although specific filters and transfer functions are mentioned above, any digital filter and transfer function combination, currently known or to be devised in the future, may be used as part of the present invention.
Now turning back to Fig. 2, there is shown, directly after the digital filter bank 140U, a digital to analog converter ("D/A") 150U. The D/A 150U may convert the filtered digital signal output of the digital filter bank 140U to an analog signal, which analog signal may then be up-converted by up-converter 160U to the original frequency which was received at input RF filter 110U. An output filter 170U may be used to remove any harmonics which may have been introduced into the signal by the up-converter 160U. Either the up-converter 160U or the output RF filter 170U may include a signal amplifier (not shown in Fig. 2).
The filtered signal may then propagate to and out of a transmission antenna.
The downstream or down-link (B) section of the bi-directional repeater 100 may almost mirror the up-stream section (A) discussed above. A difference being that the input RF filter 11 OD, digital filter bank 140D filters and output RF
filter 170D may be tuned to receive and pass frequencies of downstream communication channels, as opposed to passing frequencies at or around upstream communication channels.
Turning now to Fig. 2, there is shown a block diagram of a bi-directional repeater 100 with a digital channelizer according to the present invention.
The bi-directional repeater 100 may include two basic sections: (A) an upstream or up-link section which receives signals from a mobile device (e.g. cell phone) and retransmits the signal to a base-station; and (B) a downstream or down-link 1o section which receives signals from a base-station and retransmits the signals to a mobile device.
Looking first at the up-link section (A) from left to right on Fig. 2, there may be an input filter 110U, which for this example, may be a radio frequency ("RF") filter, or more specifically, may be a filter tuned to pass frequencies in the range of 800 to 830 MHz, for example. The input RF filter 110U may receive signals from an antenna and may pass frequencies in the frequency range of one or more communication channels to be repeated to a down.converter 120U. The down converter 120U may mix a received signal with a sine or cosine wave of a given frequency such that the received signal is down-converted to an intermediate frequency ("IF"). Either the input RF filter 110U or the down converter 120U may include a signal amplifier (Not shown in Fig. 2). An analog to digital ("AID") converter 130U may sample the IF signal and may generate a digital signal representing the sampled IF signal. The digital signal representing the IF signal may enter digital filter bank 140U. Fig. 3 shows a more detailed view of digital filter bank 140U including digital filters 140a to 140d.
Turning now to Fig. 3, there is shown a block diagram of a digital filter bank 140U including digital filters 140a to 140d. A digital signal entering digital filter bank 140U may be applied to each of the digital filters 140a through 140d and the output of each of the digital filters may be combined by an adder 142 or by a functionally equivalent device. Each of the filters within the filter bank 140U
may have a separate and distinct frequency response. Digital filters are well known in the field of communications. Implementation of a digital filter bank may 1o be performed on a single or multiple processors (e.g. DSP) or may be implemented on a single or multiple dedicated digital filtering circuits. In the example of Fig. 3, there is shown four discrete digital filter circuits. As part of some embodiment of the present invention, digital filters 140a through 140d may be field programmable digital filters ("FPDF"). That is, each filter's transfer function, along with its frequency response, may be reprogrammed or adjusted.
Turning now to Figs. 4A through 4B, there are shown examples of possible frequency responses for digital filters 140a through 140d of Fig. 3, where digital filters 140a through 140b correspond to the first through the fourth communication channels exemplified in Fig. 1A, respectively. That is, the impulse response or frequency transfer characteristic for each digital filter 140a through 140d may be separately set or adjusted to pass frequency components of a digital signal that are at or around the carrier frequency of the filter's corresponding communication channel. For example; digital filter 140a may be programmed with a transfer function having a band pass frequency response peaking at or around the carrier frequency of the first communication channel shown in Fig. 1A; Digital filter 140b may be programmed with a transfer function having a band pass frequency response peaking at or around the carrier frequency of the second communication channel shown in Fig. 1A, etc...
The design of digital filters and digital filter transfer functions is well known. Although specific filters and transfer functions are mentioned above, any digital filter and transfer function combination, currently known or to be devised in the future, may be used as part of the present invention.
Now turning back to Fig. 2, there is shown, directly after the digital filter bank 140U, a digital to analog converter ("D/A") 150U. The D/A 150U may convert the filtered digital signal output of the digital filter bank 140U to an analog signal, which analog signal may then be up-converted by up-converter 160U to the original frequency which was received at input RF filter 110U. An output filter 170U may be used to remove any harmonics which may have been introduced into the signal by the up-converter 160U. Either the up-converter 160U or the output RF filter 170U may include a signal amplifier (not shown in Fig. 2).
The filtered signal may then propagate to and out of a transmission antenna.
The downstream or down-link (B) section of the bi-directional repeater 100 may almost mirror the up-stream section (A) discussed above. A difference being that the input RF filter 11 OD, digital filter bank 140D filters and output RF
filter 170D may be tuned to receive and pass frequencies of downstream communication channels, as opposed to passing frequencies at or around upstream communication channels.
The specific frequency bands to which each of the filters is set may depend on the specific frequencies of the communication channels, upstream and downstream, an operator may wish to repeat within a specific geographic location. The frequencies shown in Fig. 1A and 1B are only examples of such communication channel frequencies. No distinction is made between upstream and downstream channels in Figs. 1A and I B. However, it will be understood by one of ordinary skill in the art that in a cellular system, there may be a corresponding upstream communication channel for each down stream communication channel. The relation between upstream channel frequency and 1o downstream channel frequency may be fixed, or each may be negotiated separately between a mobile device and a base station.
Turning now to Fig. 5, there is shown another possible embodiment of a bi-directional repeater 100 according to the present invention. As in the bi-directional repeater of Fig. 2, there are two sections; (A) an upstream or up-link section, and (B) a downstream or down-link section. Also, as in the embodiment of Fig. 2, the up-link and down-link sections may substantially mirror one another except for the frequencies they are tuned to pass and retransmit.
Looking at the downstream or down-link section (B) of the bi-directional repeater 100 of Fig. 5, there may be a duplexer including an input RF filter 11 OD.
The input RF filter IIOD may lead to a pre-filtering stage 115D which may include a low noise amplifier ("LNA") and an attenuator. The output of the pre-filtering block 115D may enter an RF unit 125D which may down convert the output and may also include an A/D converter. Digital filters in digital filter block 140D may be similar to the ones described for Figs. 2, 3 or 4A through 4D, or may be any other digital filters suitable to the present invention. The output of the digital filter block 140D may enter the RF unit 125D which may up convert the output and may also include a D/A converter. A power amplifier block 1458-may include an attenuator, a high-power amplifier, and a power monitor. An automatic gain control circuit ("AGC") may adjust the attenuator such that the output signal from the power amplifier block 145D remains substantially steady.
The output signal of the power amplifier block 145D may propagate to and through a duplexer including an output filter 170D.
As for the bi-directional repeater 100 in Fig. 2, the bi-directional repeater 100 of Fig. 5 may be configured to repeat specific sets of communication channels, at or around specific carrier frequencies, in the upstream direction, and to repeat specific sets of communication channels, at or around specific carrier frequencies, in the downstream direction. Digital filters in the digital filter banks or block, 140U and 140D, may be adjusted to pass only frequencies at or around the carrier frequencies of the relevant communication channels. Carrier frequency offsets due to up-conversion or down-conversion may be taken into account and compensated for within the digital filters. Furthermore, the bi-directional repeater 100 of the present invention may be adjusted to notch out narrow band noise interference within the communication channels' frequency band.
Turning now to Fig. 5, there is shown another possible embodiment of a bi-directional repeater 100 according to the present invention. As in the bi-directional repeater of Fig. 2, there are two sections; (A) an upstream or up-link section, and (B) a downstream or down-link section. Also, as in the embodiment of Fig. 2, the up-link and down-link sections may substantially mirror one another except for the frequencies they are tuned to pass and retransmit.
Looking at the downstream or down-link section (B) of the bi-directional repeater 100 of Fig. 5, there may be a duplexer including an input RF filter 11 OD.
The input RF filter IIOD may lead to a pre-filtering stage 115D which may include a low noise amplifier ("LNA") and an attenuator. The output of the pre-filtering block 115D may enter an RF unit 125D which may down convert the output and may also include an A/D converter. Digital filters in digital filter block 140D may be similar to the ones described for Figs. 2, 3 or 4A through 4D, or may be any other digital filters suitable to the present invention. The output of the digital filter block 140D may enter the RF unit 125D which may up convert the output and may also include a D/A converter. A power amplifier block 1458-may include an attenuator, a high-power amplifier, and a power monitor. An automatic gain control circuit ("AGC") may adjust the attenuator such that the output signal from the power amplifier block 145D remains substantially steady.
The output signal of the power amplifier block 145D may propagate to and through a duplexer including an output filter 170D.
As for the bi-directional repeater 100 in Fig. 2, the bi-directional repeater 100 of Fig. 5 may be configured to repeat specific sets of communication channels, at or around specific carrier frequencies, in the upstream direction, and to repeat specific sets of communication channels, at or around specific carrier frequencies, in the downstream direction. Digital filters in the digital filter banks or block, 140U and 140D, may be adjusted to pass only frequencies at or around the carrier frequencies of the relevant communication channels. Carrier frequency offsets due to up-conversion or down-conversion may be taken into account and compensated for within the digital filters. Furthermore, the bi-directional repeater 100 of the present invention may be adjusted to notch out narrow band noise interference within the communication channels' frequency band.
Claims (54)
1. A method of retransmitting radio signals comprising:
receiving signals each having a frequency within a frequency range;
generating a digital signal correlated to each received signal;
filtering the digital signals with a digital filter bank configured to pass a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels;
generating an analog signal correlated to each filtered digital signal; and transmitting the analog signal correlated to each filtered digital signal.
receiving signals each having a frequency within a frequency range;
generating a digital signal correlated to each received signal;
filtering the digital signals with a digital filter bank configured to pass a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels;
generating an analog signal correlated to each filtered digital signal; and transmitting the analog signal correlated to each filtered digital signal.
2. The method according to claim 1, further comprising down-converting the received signal to an intermediate frequency prior to generating a digital signal.
3. The method according to claim 2, further comprising up-converting the analog signal correlated to the filtered digital signal prior to transmitting the analog signal.
4. A method of retransmitting radio signals comprising:
receiving in an uplink section signals each having a frequency within a first frequency range;
generating a digital signal correlated to each received signal;
filtering the digital signals with a first digital filter bank configured to pass a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said first digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels;
generating an analog signal correlated to each filtered digital signal;
transmitting the analog signal correlated to each filtered digital signal; and in a downlink section filtering digital signals with a second digital filter bank configured to pass a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within a second frequency range, associated with said first frequency range, wherein said second digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels, and wherein the downlink section is a mirror of the uplink section except to the associated frequency ranges.
receiving in an uplink section signals each having a frequency within a first frequency range;
generating a digital signal correlated to each received signal;
filtering the digital signals with a first digital filter bank configured to pass a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said first digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels;
generating an analog signal correlated to each filtered digital signal;
transmitting the analog signal correlated to each filtered digital signal; and in a downlink section filtering digital signals with a second digital filter bank configured to pass a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within a second frequency range, associated with said first frequency range, wherein said second digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels, and wherein the downlink section is a mirror of the uplink section except to the associated frequency ranges.
5. A system for retransmitting radio signals within a predetermined frequency range, said system comprising:
a receiver to receive signals each having a frequency within the frequency range;
an analog to digital converter to generate a digital signal correlated to each received signal;
a digital filter bank configured to filter the digital signals by passing a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct frequency transfer function for each of at least some of said channels;
a digital to analog converter to generate an analog signal correlated to each filtered digital signal;
a transmitter to transmit the analog signal correlated to each filtered digital signal;
and wherein said digital filter bank is configured to notch out narrow band interference within the frequency band of at least one of said plurality of communication channels.
a receiver to receive signals each having a frequency within the frequency range;
an analog to digital converter to generate a digital signal correlated to each received signal;
a digital filter bank configured to filter the digital signals by passing a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct frequency transfer function for each of at least some of said channels;
a digital to analog converter to generate an analog signal correlated to each filtered digital signal;
a transmitter to transmit the analog signal correlated to each filtered digital signal;
and wherein said digital filter bank is configured to notch out narrow band interference within the frequency band of at least one of said plurality of communication channels.
6. The system according to claim 5, further comprising a down converter to convert the received signal to an intermediate frequency.
7. The system according to claim 6, further comprising an up converter to convert the analog signal correlated to the filtered digital signal to a transmission frequency.
8. The system according to claim 5, wherein said digital filter bank operates in an uplink section and further comprising in a downlink section a second digital filter bank configured to pass a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals having a band of frequency components within a second frequency range, wherein said second digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels; and wherein the downlink section is a mirror of the uplink section.
9. A system for retransmitting radio signals within a predetermined frequency range, said system comprising:
a receiver to receive signals each having a frequency within the frequency range;
an analog to digital converter to generate a digital signal correlated to each received signal;
a field programmable digital filter bank configured to filter the digital signals by passing a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said frequency components;
a digital to analog converter to generate an analog signal correlated to each filtered digital signal; and a transmitter to transmit the analog signal correlated to each filtered digital signal.
a receiver to receive signals each having a frequency within the frequency range;
an analog to digital converter to generate a digital signal correlated to each received signal;
a field programmable digital filter bank configured to filter the digital signals by passing a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said frequency components;
a digital to analog converter to generate an analog signal correlated to each filtered digital signal; and a transmitter to transmit the analog signal correlated to each filtered digital signal.
10. A system for retransmitting radio signals within a predetermined frequency range, said system comprising:
a receiver to receive signals each having a frequency within the frequency range;
an analog to digital converter to generate a digital signal correlated to each received signal;
a field programmable digital filter bank configured to filter the digital signals by passing a plurality of signals corresponding to a plurality of communication channels, each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of the channels;
a digital to analog converter to generate an analog signal correlated to each filtered digital signal; and a transmitter to transmit the analog signals correlated to each filtered digital signal;
wherein said filter bank is programmed to adjust to an optimal transfer function for each of said plurality of frequency components.
a receiver to receive signals each having a frequency within the frequency range;
an analog to digital converter to generate a digital signal correlated to each received signal;
a field programmable digital filter bank configured to filter the digital signals by passing a plurality of signals corresponding to a plurality of communication channels, each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of the channels;
a digital to analog converter to generate an analog signal correlated to each filtered digital signal; and a transmitter to transmit the analog signals correlated to each filtered digital signal;
wherein said filter bank is programmed to adjust to an optimal transfer function for each of said plurality of frequency components.
11. The system according to claim 10, wherein a relation between signals received by the receiver and signals transmitted by the transmitter is at least partly negotiable by a mobile device.
12. The system according to claim 10, wherein a relation between signals received by the receiver and signals transmitted by the transmitter is at least partly negotiable by a base station.
13. A system for retransmitting radio signals within a predetermined frequency range, said system comprising:
a receiver to receive signals each having a frequency within the frequency range;
a first gain control unit including an RF amplifier and variable attenuator to adjust said signal level;
an RF down converter unit to produce an input signal;
an analog to digital converter to generate a digital signal correlated to each input signal;
a digital filter bank configured to filter the digital signals by passing a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels;
a digital to analog converter to generate an analog signal correlated to each filtered digital signal;
an RF up converter;
a second gain control unit including an RF amplifier and a variable attenuator to adjust said analog signals such that the power of the output signal remains substantially steady to produce a desired output signal; and a transmitter to transmit the output signals correlated to each filtered digital signal.
a receiver to receive signals each having a frequency within the frequency range;
a first gain control unit including an RF amplifier and variable attenuator to adjust said signal level;
an RF down converter unit to produce an input signal;
an analog to digital converter to generate a digital signal correlated to each input signal;
a digital filter bank configured to filter the digital signals by passing a plurality of signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels;
a digital to analog converter to generate an analog signal correlated to each filtered digital signal;
an RF up converter;
a second gain control unit including an RF amplifier and a variable attenuator to adjust said analog signals such that the power of the output signal remains substantially steady to produce a desired output signal; and a transmitter to transmit the output signals correlated to each filtered digital signal.
14. The system according to claim 13, wherein said second gain control unit comprises an automatic gain control circuit.
15. The system according to claim 13, wherein said digital filter is further configured to generate a separate and distinct filter gain for each of at least some of said channels.
16. The method of claim 1, wherein said digital filter bank is programmed to generate a separate and distinct transfer function respectively for each channel.
17. The method of claim 1, wherein at least one transfer function notches out narrowband interference within the frequency band of its communication channel.
18. The method of claim 1, wherein said digital filter bank is programmed to adjust to an optimal transfer function for each of said plurality of frequency components.
19. The method of claim 1, further comprising the step of variably attenuating the received signal to adjust it; and RF down converting the attenuated signal to an IF down converted frequency, prior to generating the digital signal.
20. The method of claim 19, further comprising the step of up converting to RF
the analog signals generated, and variably attenuating the RF signals to adjust them such that the power of the signals transmitted remains substantially steady.
the analog signals generated, and variably attenuating the RF signals to adjust them such that the power of the signals transmitted remains substantially steady.
21. The method of claim 4, wherein said digital filter bank is programmed to generate a separate and distinct transfer function respectively for each channel.
22. The method of claim 4, wherein at least one transfer function notches out narrow band interference within the frequency band of its communication channel.
23. The method of claim 4, wherein said digital filter bank is programmed to adjust to an optimal transfer function for each of said plurality of frequency components.
24. The method of claim 4, further comprising the step of variably attenuating the received signal to adjust its level, and RF down converting the attenuated signal to an IF frequency prior to generating the digital signal.
25. The method of claim 24, further comprising the step of up converting to RF
the analog signals generated, and variably attenuating the RF signals to adjust them such that the power of the signals transmitted remains substantially steady.
the analog signals generated, and variably attenuating the RF signals to adjust them such that the power of the signals transmitted remains substantially steady.
26. The system of claim 5, wherein said digital filter bank is programmed to generate a separate and distinct frequency transfer function for each of said channels.
27. The system of claim 5, wherein said filter bank is programmed to adjust to an optimal transfer function for each of said plurality of frequency components.
28. The system of claim 5, further comprising:
a variable attenuator to adjust the level of the received signals, and an RF down converter to down convert the adjusted signals to IF, the analog to digital converter receiving the output from the down converter.
a variable attenuator to adjust the level of the received signals, and an RF down converter to down convert the adjusted signals to IF, the analog to digital converter receiving the output from the down converter.
29. The system of claim 28, further comprising an up converter unit to up convert to RF the analog signals generated, and a further variable attenuator for attenuating the RF signals to adjust them such that the power of the signals transmitted remains substantially steady.
30. The system of claim 10, wherein said filter bank is programmed to generate a separate and distinct transfer function respectively for each of said channel filters.
31. The system of claim 10, wherein at least one transfer function notches out narrow band interference within the frequency band of its communication channel.
32. The system of claim 10, further comprising:
a variable attenuator to adjust the received signals and an RP down converter to down convert the adjusted signals to RF, the analog to digital converter receiving the output from the down converter.
a variable attenuator to adjust the received signals and an RP down converter to down convert the adjusted signals to RF, the analog to digital converter receiving the output from the down converter.
33. The system of claim 32, further comprising an up converter unit to up convert to RF the analog signals generated, and a further variable attenuator for attenuating the RF signals to adjust them such that the power of the signals transmitted remains substantially steady.
34. The system of claim 13, wherein at least one transfer function notches out narrow band interference within the frequency band of its communication channel.
35. The system of claim 13, wherein said digital filter band is programmed to adjust to an optimal transfer function for each of said plurality of frequency components.
36. A method of transmitting radio signals, comprising:
receiving signals each having a frequency within a frequency range;
attenuating the received signals;
RF down converting the attenuated signals to IF frequency;
generating a digital signal correlated to each received signal;
filtering the digital signals with a digital filter bank configured to pass signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels, at least one transfer function notching out narrow band interference within the frequency band of its communication channel, generating an analog signal correlated to each filtered digital signal, and transmitting the analog signal correlated to each filtered digital signal.
receiving signals each having a frequency within a frequency range;
attenuating the received signals;
RF down converting the attenuated signals to IF frequency;
generating a digital signal correlated to each received signal;
filtering the digital signals with a digital filter bank configured to pass signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels, at least one transfer function notching out narrow band interference within the frequency band of its communication channel, generating an analog signal correlated to each filtered digital signal, and transmitting the analog signal correlated to each filtered digital signal.
37. A method as in claim 36, wherein said digital filter bank is programmed to generate a separate and distinct transfer function respectively for each channel.
38. The method of claim 37, wherein said digital filter bank is programmed to adjust to an optimal transfer function for each of said plurality of frequency components.
39. The method of claim 36, and further comprising the step of up converting to RF
the analog signals generated, and variably attenuating the RF signals to adjust them such that the power of the signals transmitted remains substantially steady.
the analog signals generated, and variably attenuating the RF signals to adjust them such that the power of the signals transmitted remains substantially steady.
40. A system for retransmitting radio signals within a predetermined frequency range, said system comprising:
a receiver to receive signals each having a frequency within the frequency range;
a first variable attenuator unit to adjust said signal level to produce an input signal;
an RF down converter to down convert the input signal to IF;
an analog to digital converter to generate a digital signal correlated to each down converted input signal;
a digital filter bank configured to filter the digital signals by passing signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels, at least one transfer function notching out narrowband interference within the frequency band of its communication channel;
a digital to analog converter to generate an analog signal correlated to each filtered signal, and a transmitter to transmit the analog signal correlated to each filtered digital signal.
a receiver to receive signals each having a frequency within the frequency range;
a first variable attenuator unit to adjust said signal level to produce an input signal;
an RF down converter to down convert the input signal to IF;
an analog to digital converter to generate a digital signal correlated to each down converted input signal;
a digital filter bank configured to filter the digital signals by passing signals corresponding to a plurality of communication channels, wherein each channel is configured to pass multiple signals covering a band of frequency components within said frequency range, wherein said digital filter bank is programmed to generate a separate and distinct transfer function for each of at least some of said channels, at least one transfer function notching out narrowband interference within the frequency band of its communication channel;
a digital to analog converter to generate an analog signal correlated to each filtered signal, and a transmitter to transmit the analog signal correlated to each filtered digital signal.
41. The system of claim 40, wherein said filter bank is programmed to generate a separate and distinct frequency transfer function for each of said channel filters.
42. The system of claim 40, wherein said filter bank is programmed to adjust to an optimal transfer function for each of said plurality of frequency components.
43. The system of claim 40, further comprising an up converter unit to up convert to RF the analog signals generated, and a further variable attenuator for attenuating the RF signals to adjust them such that the power of the signals transmitted remains substantially steady.
44. A method of retransmitting radio signals in a frequency range shared by two or more operators, at least one of the two operators being assigned two or more frequency bands within that frequency range, the method comprising the steps:
receiving the radio signals through an RF filter;
generating a digital signal correlated to each received signal;
filtering the digital signals;
generating an analog signal correlated to each filtered digital signal; and transmitting the analog signal correlated to each filtered digital signal, characterized in that the RF filter passes radio signals within the frequency range of all the frequency bands assigned to said two or more operators, the digital signals are filtered with a digital filter bank which includes a digital filter for each frequency band, the specific bands to which the digital filters of the digital filter bank are set depend on the specific frequency bands the one or more operators wishes to repeat, and each digital filter is adjusted so that its transfer function has a separate and distinct frequency response for each frequency band, each filter is configured to pass multiple of the digital signals within its filter frequency band.
receiving the radio signals through an RF filter;
generating a digital signal correlated to each received signal;
filtering the digital signals;
generating an analog signal correlated to each filtered digital signal; and transmitting the analog signal correlated to each filtered digital signal, characterized in that the RF filter passes radio signals within the frequency range of all the frequency bands assigned to said two or more operators, the digital signals are filtered with a digital filter bank which includes a digital filter for each frequency band, the specific bands to which the digital filters of the digital filter bank are set depend on the specific frequency bands the one or more operators wishes to repeat, and each digital filter is adjusted so that its transfer function has a separate and distinct frequency response for each frequency band, each filter is configured to pass multiple of the digital signals within its filter frequency band.
45. The method of claim 44, characterized in that the digital filter bank is configured to notch out narrowband interference within at least one frequency band.
46. The method of any one of claims 44 or 45, wherein the generating the digital signal is by an analog to digital converter and further characterized by attenuating by a variable RF attenuator to adjust the level of the received signals, to the dynamic range requirements of said analog to digital converter, converting by an RF to IF
down converter to down convert the adjusted signals to IF, said analog to digital converter receiving the output from the down converter, and sending it to the digital filter.
down converter to down convert the adjusted signals to IF, said analog to digital converter receiving the output from the down converter, and sending it to the digital filter.
47. The method of claim 46, further characterized by up-converting to RF the analog signals generated, and thereafter variably changing the power level of the RF
signals to adjust them before transmitting them, such that the power of the signals transmitted remains substantially steady.
signals to adjust them before transmitting them, such that the power of the signals transmitted remains substantially steady.
48. The method according to any one of claims 44 to 46, wherein said steps occur in an uplink section, and;
further comprising, in a downlink section, the step of downlink filtering digital signals with a second digital filter bank which includes a digital filter for each frequency band, the specific bands to which the digital filters of the second digital filter bank are set depend on the specific frequency bands the one or more operators wish to repeat, and each digital filter is adjusted so that its transfer function has a separate and distinct frequency response for each frequency band, each filter is configured to pass multiple of the digital signals within its filter frequency band.
further comprising, in a downlink section, the step of downlink filtering digital signals with a second digital filter bank which includes a digital filter for each frequency band, the specific bands to which the digital filters of the second digital filter bank are set depend on the specific frequency bands the one or more operators wish to repeat, and each digital filter is adjusted so that its transfer function has a separate and distinct frequency response for each frequency band, each filter is configured to pass multiple of the digital signals within its filter frequency band.
49. The method according to claim 48, further characterized in that the downlink section is a mirror of the uplink section except for the associated frequency ranges.
50. A system for retransmitting radio signals in a frequency range shared by two or more operators, at least one of the two operators being assigned two or more frequency bands within that frequency range, said system comprising:
a receiver to receive the radio signals through an RF filter;
an analog to digital converter to generate a digital signal correlated to each received signal;
a field programmable digital bank filter to filter said digital signals; a digital to analog converter to generate an analog signal correlated to each filtered digital signal;
and a transmitter to transmit the analog signal correlated to each filtered digital signal;
characterized in that the RF filter passes radio signals within the frequency range of all the frequency bands assigned to said two or more operators, wherein the digital filter is configured to filter the digital signals, and wherein the filter bank includes a digital filter for each frequency band, the specific bands to which the digital filters of the digital filter bank are set depend on the specific frequency bands the operator wishes to repeat, and each digital filter is programmed so that its transfer function has a separate and distinct frequency response for each frequency band, each filter is configured to pass multiple of the digital signals within its filter frequency band.
a receiver to receive the radio signals through an RF filter;
an analog to digital converter to generate a digital signal correlated to each received signal;
a field programmable digital bank filter to filter said digital signals; a digital to analog converter to generate an analog signal correlated to each filtered digital signal;
and a transmitter to transmit the analog signal correlated to each filtered digital signal;
characterized in that the RF filter passes radio signals within the frequency range of all the frequency bands assigned to said two or more operators, wherein the digital filter is configured to filter the digital signals, and wherein the filter bank includes a digital filter for each frequency band, the specific bands to which the digital filters of the digital filter bank are set depend on the specific frequency bands the operator wishes to repeat, and each digital filter is programmed so that its transfer function has a separate and distinct frequency response for each frequency band, each filter is configured to pass multiple of the digital signals within its filter frequency band.
51. The system of claim 50, further characterized in that said field programmable digital filter bank is configured to notch out narrow band interference within at least one frequency band.
52. The system of any one of claims 50 or 51, further characterized by:
a variable RF attenuator to adjust the level of the received signals, to the dynamic range requirements of the analog to digital converters, an RF to IF
down converter, to down convert the adjusted signals to IF, the analog to digital converter receiving the output from the down converter, and sending it to the digital filter, the digital to analog converter converting the analog signals to IF and an up converter unit to up convert to RF the IF analog signals generated, and a further variable amplifier/attenuator for amplifying or attenuating the RF
signals to adjust them such that the power of the signals transmitted remains substantially steady.
a variable RF attenuator to adjust the level of the received signals, to the dynamic range requirements of the analog to digital converters, an RF to IF
down converter, to down convert the adjusted signals to IF, the analog to digital converter receiving the output from the down converter, and sending it to the digital filter, the digital to analog converter converting the analog signals to IF and an up converter unit to up convert to RF the IF analog signals generated, and a further variable amplifier/attenuator for amplifying or attenuating the RF
signals to adjust them such that the power of the signals transmitted remains substantially steady.
53. The system according to any one of claims 50 to 52, wherein said field programmable digital filter bank operates in an uplink section and further comprising a downlink section including a second field programmable filter bank which includes a digital filter for each band, the specific bands to which the digital filters of the digital filter bank are set depend on the specific frequency bands the one or more operators wish to repeat, and each digital filter is programmed so that its transfer function has a separate and distinct frequency response for each frequency band, each filter is configured to pass multiple of the digital signals within its filter frequency band.
54. The system according to claim 53, further characterized in that the downlink section is a mirror of the uplink section except as to the associated frequency range.
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| US10/175,146 US6873823B2 (en) | 2002-06-20 | 2002-06-20 | Repeater with digital channelizer |
| US10/175,146 | 2002-06-20 | ||
| PCT/IL2003/000526 WO2004002015A2 (en) | 2002-06-20 | 2003-06-22 | Repeater with digital channelizer |
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| EP1522155B1 (en) | 2012-07-04 |
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| IL165824A0 (en) | 2006-01-15 |
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