CA2214061A1 - Differential psk signalling in cdma networks - Google Patents
Differential psk signalling in cdma networksInfo
- Publication number
- CA2214061A1 CA2214061A1 CA002214061A CA2214061A CA2214061A1 CA 2214061 A1 CA2214061 A1 CA 2214061A1 CA 002214061 A CA002214061 A CA 002214061A CA 2214061 A CA2214061 A CA 2214061A CA 2214061 A1 CA2214061 A1 CA 2214061A1
- Authority
- CA
- Canada
- Prior art keywords
- signal
- phase
- bit group
- message bit
- demodulated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
- H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
- H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
- H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
- H04L27/2071—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the carrier phase, e.g. systems with differential coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
- H04L27/2332—Demodulator circuits; Receiver circuits using non-coherent demodulation using a non-coherent carrier
Abstract
A method and a system for detecting a user signal in a CDMA network.
(Coded) user message bits are grouped into successive groups. A differential phase is generated for each message bit group by mapping each message bit group on to a predetermined PSK constellation. An absolute phase is generated for each message bit group based on the differential phase for the current message bit group and the absolute phase for the preceding message bit group. The absolute phase signal is phase keyed to an RF carrier to form an RF signal. The RF signal is spread using two code sequences and the spread RF signal is transmitted. At the receiver, the RF signal is received and non-coherently demodulated. The demodulated RF signal is despread using the codesequences. Successive blocks of the demodulated, despread RF signal are phase compared for extracting the differential phase signal carrying the (coded) user message.
(Coded) user message bits are grouped into successive groups. A differential phase is generated for each message bit group by mapping each message bit group on to a predetermined PSK constellation. An absolute phase is generated for each message bit group based on the differential phase for the current message bit group and the absolute phase for the preceding message bit group. The absolute phase signal is phase keyed to an RF carrier to form an RF signal. The RF signal is spread using two code sequences and the spread RF signal is transmitted. At the receiver, the RF signal is received and non-coherently demodulated. The demodulated RF signal is despread using the codesequences. Successive blocks of the demodulated, despread RF signal are phase compared for extracting the differential phase signal carrying the (coded) user message.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US808,776 | 1997-03-04 | ||
US08/808,776 US6072785A (en) | 1997-03-04 | 1997-03-04 | Differential PSK signalling in CDMA networks |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2214061A1 true CA2214061A1 (en) | 1998-09-04 |
CA2214061C CA2214061C (en) | 2001-08-14 |
Family
ID=25199709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002214061A Expired - Fee Related CA2214061C (en) | 1997-03-04 | 1997-08-21 | Differential psk signalling in cdma networks |
Country Status (4)
Country | Link |
---|---|
US (1) | US6072785A (en) |
EP (1) | EP0863643A3 (en) |
JP (1) | JPH10294719A (en) |
CA (1) | CA2214061C (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999059280A1 (en) * | 1998-05-14 | 1999-11-18 | Masahichi Kishi | Code division multiple access (cdma) transmission system |
ES2308796T3 (en) * | 1998-08-21 | 2008-12-01 | Lucent Technologies Inc. | CDMA MULTI-CODE SYSTEM THAT USES AN ITERATIVE DECODIFICATION. |
FR2822001B1 (en) * | 2001-03-06 | 2003-06-27 | France Telecom | DEVICE FOR EQUALIZING AND DECODING FREQUENCY SELECTIVE CHANNELS |
KR100439220B1 (en) * | 2002-03-26 | 2004-07-05 | 엘지전자 주식회사 | Circuit and operation method for keeping quality of signal in CDMA system |
US7292547B1 (en) * | 2002-05-22 | 2007-11-06 | The Directv Group, Inc. | Device and method for nodal multiple access into communications channels |
KR100600828B1 (en) * | 2003-12-09 | 2006-07-14 | 한국전자통신연구원 | Receiving apparatus of wake-up information |
US20090273439A1 (en) * | 2008-05-01 | 2009-11-05 | Richard Selsor | Micro-chip ID |
KR101647922B1 (en) * | 2015-04-10 | 2016-08-11 | 재단법인대구경북과학기술원 | System and method for symbol repetition of non-coherent dpsk |
FR3085568B1 (en) * | 2018-08-31 | 2020-08-07 | Zodiac Data Systems | METHOD OF DATETING TELEMETRY SIGNALS |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4651320A (en) * | 1984-12-24 | 1987-03-17 | American Telephone And Telegraph Company | Inband coding of secondary data |
US5023889A (en) * | 1988-05-31 | 1991-06-11 | California Institute Of Technology | Trellis coded multilevel DPSK system with doppler correction for mobile satellite channels |
US5038341A (en) * | 1989-12-01 | 1991-08-06 | Hughes Aircraft Company | Relay communication system |
US5103459B1 (en) * | 1990-06-25 | 1999-07-06 | Qualcomm Inc | System and method for generating signal waveforms in a cdma cellular telephone system |
US5329547A (en) * | 1993-03-11 | 1994-07-12 | Motorola, Inc. | Method and apparatus for coherent communication in a spread-spectrum communication system |
CA2121934A1 (en) * | 1993-06-14 | 1994-12-15 | Gordon Bremer | Simultaneous analog and digital communication with improved phase immunity |
MY112371A (en) * | 1993-07-20 | 2001-05-31 | Qualcomm Inc | System and method for orthogonal spread spectrum sequence generation in variable data rate systems |
US5506861A (en) * | 1993-11-22 | 1996-04-09 | Ericsson Ge Mobile Comminications Inc. | System and method for joint demodulation of CDMA signals |
JP3421880B2 (en) * | 1994-10-05 | 2003-06-30 | ソニー株式会社 | Demodulator |
US5608722A (en) * | 1995-04-03 | 1997-03-04 | Qualcomm Incorporated | Multi-user communication system architecture with distributed receivers |
US5767738A (en) * | 1996-10-21 | 1998-06-16 | Motorola, Inc. | Apparatus and method for demodulating a modulated signal |
US6072770A (en) * | 1997-03-04 | 2000-06-06 | At&T Corporation | Method and system providing unified DPSK-PSK signalling for CDMA-based satellite communications |
-
1997
- 1997-03-04 US US08/808,776 patent/US6072785A/en not_active Expired - Lifetime
- 1997-08-15 EP EP97306233A patent/EP0863643A3/en not_active Withdrawn
- 1997-08-21 CA CA002214061A patent/CA2214061C/en not_active Expired - Fee Related
-
1998
- 1998-03-04 JP JP10051185A patent/JPH10294719A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0863643A2 (en) | 1998-09-09 |
EP0863643A3 (en) | 2000-03-08 |
CA2214061C (en) | 2001-08-14 |
US6072785A (en) | 2000-06-06 |
JPH10294719A (en) | 1998-11-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |
Effective date: 20170821 |
|
MKLA | Lapsed |
Effective date: 20170821 |