WO1997048219A3 - Transmitter for qam encoded data - Google Patents

Transmitter for qam encoded data Download PDF

Info

Publication number
WO1997048219A3
WO1997048219A3 PCT/US1997/008318 US9708318W WO9748219A3 WO 1997048219 A3 WO1997048219 A3 WO 1997048219A3 US 9708318 W US9708318 W US 9708318W WO 9748219 A3 WO9748219 A3 WO 9748219A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
data bits
qpsk
encoding
oqpsk
Prior art date
Application number
PCT/US1997/008318
Other languages
French (fr)
Other versions
WO1997048219A2 (en
Inventor
Paul W Dent
Original Assignee
Ericsson Ge Mobile Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ericsson Ge Mobile Inc filed Critical Ericsson Ge Mobile Inc
Priority to BRPI9709696-2A priority Critical patent/BR9709696B1/en
Priority to CA002257930A priority patent/CA2257930C/en
Priority to EP97925603A priority patent/EP0904650B1/en
Priority to DE69738130T priority patent/DE69738130T2/en
Priority to AU30692/97A priority patent/AU739232B2/en
Priority to JP50159898A priority patent/JP3887022B2/en
Publication of WO1997048219A2 publication Critical patent/WO1997048219A2/en
Publication of WO1997048219A3 publication Critical patent/WO1997048219A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03184—Details concerning the metric
    • H04L25/03197—Details concerning the metric methods of calculation involving metrics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03248—Arrangements for operating in conjunction with other apparatus
    • H04L25/03292—Arrangements for operating in conjunction with other apparatus with channel estimation circuitry
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of 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
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
    • H04L27/2017—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3488—Multiresolution systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se

Abstract

Quadrature Amplitude Modulated signals are generated from data bits by using a first Quadrature Phase Shift Keying (QPSK) modulator for encoding a first pair of the data bits into one of four carrier signal phases, thereby producing a firs QPSK signal. A second QPSK modulator encodes a second pair of the data bits into one of four carrier signal phases, thereby producing a second QPSK signal. The first QPSK signal is amplified to a first power level, and the second QPSK signal is amplified to a second power level. The first and second amplified signals are then combined to produce a signal in which four data bits are encoded. In another aspect of the invention, a new type of modulation, called Offset Quadrature Phase Shift Keying (OQPSK), is used in place of the first and second QPSK modulators, so that an Offset Quadrature Amplitude Modulation (OQAM) transmitter is formed. An OQPSK modulator encodes data bits by encoding a first sub-group of the data bits into a real part of a complex signal at an odd instant of a clock, and by encoding a second sub-group of the data bits into an imaginary part of the complex signal at an even instant of the clock. OQPSK modulation provides the benefit of having all signal transitions being constrained to trajectories around constant radius circles, thereby producing spectral efficiency.
PCT/US1997/008318 1996-06-12 1997-05-19 Transmitter for qam encoded data WO1997048219A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BRPI9709696-2A BR9709696B1 (en) 1996-06-12 1997-05-19 process and apparatus for generating a modulated signal.
CA002257930A CA2257930C (en) 1996-06-12 1997-05-19 Transmitter for qam encoded data
EP97925603A EP0904650B1 (en) 1996-06-12 1997-05-19 Transmitter for qam encoded data
DE69738130T DE69738130T2 (en) 1996-06-12 1997-05-19 TRANSMITTER FOR QAM-CODED DATA
AU30692/97A AU739232B2 (en) 1996-06-12 1997-05-19 Transmitter for QAM encoded data
JP50159898A JP3887022B2 (en) 1996-06-12 1997-05-19 Transmitter for quadrature amplitude modulation data

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/662,940 US5815531A (en) 1996-06-12 1996-06-12 Transmitter for encoded data bits
US08/662,940 1996-06-12

Publications (2)

Publication Number Publication Date
WO1997048219A2 WO1997048219A2 (en) 1997-12-18
WO1997048219A3 true WO1997048219A3 (en) 1998-02-05

Family

ID=24659851

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/008318 WO1997048219A2 (en) 1996-06-12 1997-05-19 Transmitter for qam encoded data

Country Status (13)

Country Link
US (1) US5815531A (en)
EP (1) EP0904650B1 (en)
JP (1) JP3887022B2 (en)
CN (1) CN1183730C (en)
AU (1) AU739232B2 (en)
BR (1) BR9709696B1 (en)
CA (1) CA2257930C (en)
DE (1) DE69738130T2 (en)
MY (1) MY132622A (en)
SA (1) SA97180141B1 (en)
SG (1) SG143061A1 (en)
TW (1) TW329582B (en)
WO (1) WO1997048219A2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7647030B2 (en) 2004-10-22 2010-01-12 Parkervision, Inc. Multiple input single output (MISO) amplifier with circuit branch output tracking
US8884694B2 (en) 2007-06-28 2014-11-11 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification
US9166528B2 (en) 2004-10-22 2015-10-20 Parkervision, Inc. RF power transmission, modulation, and amplification embodiments
US9419692B2 (en) 2005-10-24 2016-08-16 Parkervision, Inc. Antenna control

Families Citing this family (93)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6185259B1 (en) * 1996-06-12 2001-02-06 Ericsson Inc. Transmitter/receiver for GMSK and offset-QAM
US6456627B1 (en) * 1997-08-29 2002-09-24 Telefonaktiebolaget Lm Ericsson (Publ) Method for communicating information in a communication system that supports multiple modulation schemes
US5909469A (en) * 1997-08-29 1999-06-01 Telefonaktoebolaget Lm Ericsson Link adaptation method for links using modulation schemes that have different symbol rates
US6889034B1 (en) 1998-04-02 2005-05-03 Ericsson Inc. Antenna coupling systems and methods for transmitters
US6285251B1 (en) 1998-04-02 2001-09-04 Ericsson Inc. Amplification systems and methods using fixed and modulated power supply voltages and buck-boost control
US6133788A (en) * 1998-04-02 2000-10-17 Ericsson Inc. Hybrid Chireix/Doherty amplifiers and methods
US5930128A (en) * 1998-04-02 1999-07-27 Ericsson Inc. Power waveform synthesis using bilateral devices
US6311046B1 (en) 1998-04-02 2001-10-30 Ericsson Inc. Linear amplification systems and methods using more than two constant length vectors
KR100379451B1 (en) * 1998-12-04 2003-09-19 엘지전자 주식회사 Digital Television Transmission System and Operation Method
US6201452B1 (en) * 1998-12-10 2001-03-13 Ericsson Inc. Systems and methods for converting a stream of complex numbers into a modulated radio power signal
US6301310B1 (en) * 1998-12-14 2001-10-09 Hughes Electronics Corporation Efficient implementation for systems using CEOQPSK
US6411655B1 (en) 1998-12-18 2002-06-25 Ericsson Inc. Systems and methods for converting a stream of complex numbers into an amplitude and phase-modulated radio power signal
US6181199B1 (en) 1999-01-07 2001-01-30 Ericsson Inc. Power IQ modulation systems and methods
US6560296B1 (en) * 1999-05-04 2003-05-06 Lucent Technologies Inc. Method and apparatus for modulating digital data
EP1232623B1 (en) * 1999-11-23 2005-10-19 Thomson Licensing A hierarchical qam transmission system with varying grouping factor
US6567477B1 (en) * 2000-03-14 2003-05-20 Lockheed Martin Corporation Two-dimensional constellation generation, pruning, and partial gray coding for bandwidth and power efficiency
US6694147B1 (en) * 2000-09-15 2004-02-17 Flarion Technologies, Inc. Methods and apparatus for transmitting information between a basestation and multiple mobile stations
US6577199B2 (en) 2000-12-07 2003-06-10 Ericsson, Inc. Harmonic matching network for a saturated amplifier
US6512799B2 (en) * 2001-02-06 2003-01-28 University Of South Alabama Digital communication system and method for increased bit rates
JP3565175B2 (en) * 2001-03-16 2004-09-15 株式会社村田製作所 Wireless communication equipment
US7184489B2 (en) 2001-04-27 2007-02-27 The Directv Group, Inc. Optimization technique for layered modulation
US7778365B2 (en) 2001-04-27 2010-08-17 The Directv Group, Inc. Satellite TWTA on-line non-linearity measurement
US7209524B2 (en) 2001-04-27 2007-04-24 The Directv Group, Inc. Layered modulation for digital signals
US7423987B2 (en) 2001-04-27 2008-09-09 The Directv Group, Inc. Feeder link configurations to support layered modulation for digital signals
US7471735B2 (en) 2001-04-27 2008-12-30 The Directv Group, Inc. Maximizing power and spectral efficiencies for layered and conventional modulations
US7184473B2 (en) * 2001-04-27 2007-02-27 The Directv Group, Inc. Equalizers for layered modulated and other signals
US7483505B2 (en) 2001-04-27 2009-01-27 The Directv Group, Inc. Unblind equalizer architecture for digital communication systems
US7583728B2 (en) 2002-10-25 2009-09-01 The Directv Group, Inc. Equalizers for layered modulated and other signals
US7502430B2 (en) 2001-04-27 2009-03-10 The Directv Group, Inc. Coherent averaging for measuring traveling wave tube amplifier nonlinearity
US7639759B2 (en) 2001-04-27 2009-12-29 The Directv Group, Inc. Carrier to noise ratio estimations from a received signal
US7173981B1 (en) 2001-04-27 2007-02-06 The Directv Group, Inc. Dual layer signal processing in a layered modulation digital signal system
US8005035B2 (en) 2001-04-27 2011-08-23 The Directv Group, Inc. Online output multiplexer filter measurement
US7151807B2 (en) 2001-04-27 2006-12-19 The Directv Group, Inc. Fast acquisition of timing and carrier frequency from received signal
US7822154B2 (en) 2001-04-27 2010-10-26 The Directv Group, Inc. Signal, interference and noise power measurement
US7245671B1 (en) 2001-04-27 2007-07-17 The Directv Group, Inc. Preprocessing signal layers in a layered modulation digital signal system to use legacy receivers
US7085500B2 (en) * 2001-04-30 2006-08-01 Lockheed Martin Corp. Programmable optical vector modulator and method for use in coherent optical communications
AU2003280499A1 (en) 2002-07-01 2004-01-19 The Directv Group, Inc. Improving hierarchical 8psk performance
ES2604453T3 (en) 2002-07-03 2017-03-07 The Directv Group, Inc. Method and apparatus for layered modulation
US8190163B2 (en) 2002-08-08 2012-05-29 Qualcomm Incorporated Methods and apparatus of enhanced coding in multi-user communication systems
US7363039B2 (en) 2002-08-08 2008-04-22 Qualcomm Incorporated Method of creating and utilizing diversity in multiple carrier communication system
US6961595B2 (en) 2002-08-08 2005-11-01 Flarion Technologies, Inc. Methods and apparatus for operating mobile nodes in multiple states
WO2004017590A1 (en) * 2002-08-19 2004-02-26 The Regents Of The University Of California Fpga implementation of a digital qam modulator
CA2503530C (en) 2002-10-25 2009-12-22 The Directv Group, Inc. Lower complexity layered modulation signal processor
US7230480B2 (en) 2002-10-25 2007-06-12 The Directv Group, Inc. Estimating the operating point on a non-linear traveling wave tube amplifier
US7474710B2 (en) 2002-10-25 2009-01-06 The Directv Group, Inc. Amplitude and phase matching for layered modulation reception
US7529312B2 (en) 2002-10-25 2009-05-05 The Directv Group, Inc. Layered modulation for terrestrial ATSC applications
US7463676B2 (en) 2002-10-25 2008-12-09 The Directv Group, Inc. On-line phase noise measurement for layered modulation
AU2003282854A1 (en) * 2002-10-25 2004-05-25 The Directv Group, Inc. Method and apparatus for tailoring carrier power requirements according to availability in layered modulation systems
EP1418723A1 (en) * 2002-11-05 2004-05-12 Siemens Aktiengesellschaft Method of modulating a binary data stream
BRPI0407606A (en) 2003-02-19 2006-02-21 Flarion Technologies Inc improved coding methods and apparatus in multi-user communication systems
US8593932B2 (en) 2003-05-16 2013-11-26 Qualcomm Incorporated Efficient signal transmission methods and apparatus using a shared transmission resource
US7925291B2 (en) 2003-08-13 2011-04-12 Qualcomm Incorporated User specific downlink power control channel Q-bit
US7502429B2 (en) 2003-10-10 2009-03-10 The Directv Group, Inc. Equalization for traveling wave tube amplifier nonlinearity measurements
US8014405B2 (en) * 2004-03-10 2011-09-06 At&T Intellectual Property I, L.P. Upgrading ATM embedded networks to carry IP signals
US7680213B2 (en) 2004-04-14 2010-03-16 Nokia Corporation Generating higher order modulation using QPSK modulations
US7508884B2 (en) * 2005-03-24 2009-03-24 Harris Corporation System and method for communicating data using constant amplitude equalized waveform
US7352795B2 (en) * 2005-05-04 2008-04-01 Harris Corporation System and method for communicating data using constant amplitude waveform with hybrid orthogonal and MSK or GMSK modulation
US20070009064A1 (en) * 2005-07-07 2007-01-11 Zhijun Cai Method and apparatus to facilitate transmission of multiple data streams
US7961813B2 (en) * 2005-09-06 2011-06-14 Nihon University Multi-value modulation/demodulation method and multi-value modulation/demodulation device
JP4677590B2 (en) * 2005-09-06 2011-04-27 学校法人日本大学 Phased array antenna
US7911272B2 (en) 2007-06-19 2011-03-22 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including blended control embodiments
KR101100209B1 (en) * 2005-12-27 2011-12-28 엘지전자 주식회사 apparatus and method for transmitting data using a plurality of carriers
US7869542B2 (en) * 2006-02-03 2011-01-11 Quantance, Inc. Phase error de-glitching circuit and method of operating
CN101401261B (en) * 2006-02-03 2012-11-21 匡坦斯公司 Power amplifier controller circuit
US7761065B2 (en) * 2006-02-03 2010-07-20 Quantance, Inc. RF power amplifier controller circuit with compensation for output impedance mismatch
US8032097B2 (en) * 2006-02-03 2011-10-04 Quantance, Inc. Amplitude error de-glitching circuit and method of operating
US8095090B2 (en) * 2006-02-03 2012-01-10 Quantance, Inc. RF power amplifier controller circuit
US7917106B2 (en) * 2006-02-03 2011-03-29 Quantance, Inc. RF power amplifier controller circuit including calibrated phase control loop
US7933570B2 (en) * 2006-02-03 2011-04-26 Quantance, Inc. Power amplifier controller circuit
US20070211669A1 (en) * 2006-03-07 2007-09-13 Bhupesh Manoharlal Umatt Method and apparatus for searching radio technologies
US8031804B2 (en) 2006-04-24 2011-10-04 Parkervision, Inc. Systems and methods of RF tower transmission, modulation, and amplification, including embodiments for compensating for waveform distortion
US7937106B2 (en) 2006-04-24 2011-05-03 ParkerVision, Inc, Systems and methods of RF power transmission, modulation, and amplification, including architectural embodiments of same
US20070297533A1 (en) * 2006-06-26 2007-12-27 Interdigital Technology Corporation Apparatus and methods for implementing hierarchical modulation and demodulation for geran evolution
US8315336B2 (en) 2007-05-18 2012-11-20 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including a switching stage embodiment
PL2515587T3 (en) 2007-01-11 2021-04-19 Qualcomm Incorporated Using dtx and drx in a wireless communication system
WO2008156800A1 (en) 2007-06-19 2008-12-24 Parkervision, Inc. Combiner-less multiple input single output (miso) amplification with blended control
US8331471B1 (en) * 2007-07-05 2012-12-11 Xilinx, Inc. Low bit-rate feedback for wireless communication systems with reduced computational complexity
CN101370160B (en) * 2007-08-13 2011-12-21 电信科学技术研究院 TFCI information modulation method and apparatus
JP5579070B2 (en) * 2007-11-01 2014-08-27 アルカテル−ルーセント Method and apparatus for transmitting / receiving audio / video content in a wireless access network
WO2009145887A1 (en) 2008-05-27 2009-12-03 Parkervision, Inc. Systems and methods of rf power transmission, modulation, and amplification
CN102171980B (en) * 2008-07-31 2014-01-29 爱立信电话股份有限公司 Optical signal modulation
US8995568B1 (en) * 2008-09-05 2015-03-31 Marvell International Ltd. Phase transformation of repeated signals
WO2012139126A1 (en) 2011-04-08 2012-10-11 Parkervision, Inc. Systems and methods of rf power transmission, modulation, and amplification
EP2697948A4 (en) * 2011-04-14 2014-09-10 Alcatel Lucent Method and apparatus for implementing high-order modulation schemes using low-order modulators
WO2014100235A1 (en) * 2012-12-18 2014-06-26 Brilliant Points, Inc. System and method for digital signaling and digital storage
US10318158B2 (en) 2012-05-17 2019-06-11 Brilliant Points, Inc. System and method for digital signaling and digital storage
JP5643278B2 (en) * 2012-11-16 2014-12-17 日本電信電話株式会社 RADIO COMMUNICATION SYSTEM, RECEPTION DEVICE, AND RADIO COMMUNICATION METHOD
CN105103511B (en) * 2013-04-12 2019-02-15 太阳专利托管公司 Sending method
KR20160058855A (en) 2013-09-17 2016-05-25 파커비전, 인크. Method, apparatus and system for rendering an information bearing function of time
PT107256B (en) * 2013-10-28 2018-04-06 Faculdade De Ciencias E Tecnologia Da Univ Nova De Lisboa TRANSMISSION METHOD
WO2020028409A1 (en) * 2018-07-30 2020-02-06 The Regents Of The University Of California Transmitter architecture for generating 4n-qam constellation with no digital-to-analog converters (dac) in signal path requirement
US11736320B2 (en) * 2022-02-14 2023-08-22 Ultralogic 6G, Llc Multiplexed amplitude-phase modulation for 5G/6G noise mitigation
US11595237B1 (en) * 2022-05-03 2023-02-28 Qualcomm Incorporated Peak reduction tone allocation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4485357A (en) * 1981-03-09 1984-11-27 U.S. Philips Corporation Circuit for amplitude and phase modulation of carrier signal by two respective input signals
US4737968A (en) * 1985-10-25 1988-04-12 Phillips Petroleum Company QPSK transmission system having phaselocked tracking filter for spectrum shaping
EP0382697A2 (en) * 1989-02-08 1990-08-16 Nokia Mobile Phones Ltd. Control voltage generator in a transmitter arrangement for digitally modulated signals
EP0583059A1 (en) * 1992-07-01 1994-02-16 Loral Aerospace Corporation Adaptive signal modulation system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE465494B (en) * 1990-01-22 1991-09-16 Ericsson Telefon Ab L M PROCEDURE TO COMPENSATE FOR OILARITIES IN A FINAL AMPLIFIER
US5222103A (en) * 1991-01-02 1993-06-22 Gte Laboratories Incorporated Differential quadrature phase shift keying encoder for subcarrier systems
US5354129A (en) * 1993-08-12 1994-10-11 Yowell Donald H Mixing-cutting paddle
US5694433A (en) * 1994-09-14 1997-12-02 Ericsson Inc. Efficient linear power amplification
US5612651A (en) * 1996-01-02 1997-03-18 Loral Aerospace Corp. Modulating array QAM transmitter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4485357A (en) * 1981-03-09 1984-11-27 U.S. Philips Corporation Circuit for amplitude and phase modulation of carrier signal by two respective input signals
US4737968A (en) * 1985-10-25 1988-04-12 Phillips Petroleum Company QPSK transmission system having phaselocked tracking filter for spectrum shaping
EP0382697A2 (en) * 1989-02-08 1990-08-16 Nokia Mobile Phones Ltd. Control voltage generator in a transmitter arrangement for digitally modulated signals
EP0583059A1 (en) * 1992-07-01 1994-02-16 Loral Aerospace Corporation Adaptive signal modulation system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7647030B2 (en) 2004-10-22 2010-01-12 Parkervision, Inc. Multiple input single output (MISO) amplifier with circuit branch output tracking
US9143088B2 (en) 2004-10-22 2015-09-22 Parkervision, Inc. Control modules
US9166528B2 (en) 2004-10-22 2015-10-20 Parkervision, Inc. RF power transmission, modulation, and amplification embodiments
US9197164B2 (en) 2004-10-22 2015-11-24 Parkervision, Inc. RF power transmission, modulation, and amplification, including direct cartesian 2-branch embodiments
US9197163B2 (en) 2004-10-22 2015-11-24 Parkvision, Inc. Systems, and methods of RF power transmission, modulation, and amplification, including embodiments for output stage protection
US9419692B2 (en) 2005-10-24 2016-08-16 Parkervision, Inc. Antenna control
US8884694B2 (en) 2007-06-28 2014-11-11 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification

Also Published As

Publication number Publication date
US5815531A (en) 1998-09-29
SA97180141B1 (en) 2006-07-30
JP3887022B2 (en) 2007-02-28
TW329582B (en) 1998-04-11
EP0904650B1 (en) 2007-09-12
MY132622A (en) 2007-10-31
JP2000512457A (en) 2000-09-19
CA2257930C (en) 2006-05-09
BR9709696A (en) 1999-08-10
CA2257930A1 (en) 1997-12-18
BR9709696B1 (en) 2010-08-10
EP0904650A2 (en) 1999-03-31
SG143061A1 (en) 2008-06-27
AU739232B2 (en) 2001-10-04
CN1222277A (en) 1999-07-07
WO1997048219A2 (en) 1997-12-18
DE69738130T2 (en) 2008-06-12
DE69738130D1 (en) 2007-10-25
AU3069297A (en) 1998-01-07
CN1183730C (en) 2005-01-05

Similar Documents

Publication Publication Date Title
WO1997048219A3 (en) Transmitter for qam encoded data
CA1211517A (en) Correlated signal processor and modulator
JP2758211B2 (en) Frequency direct modulation PSK method
EP0783218A3 (en) QAM modulator using an array of QPSK modulators
US20030198478A1 (en) Method and system for generating and decoding a bandwidth efficient multi-level signal
JP4946891B2 (en) Signal modulation using fractional phase modulator
WO2000035160A8 (en) Qam modulator for radio communications
US6025758A (en) Method and apparatus for performing digital data signal modulation
US20080019703A1 (en) Optical Transmitter Using Nyquist Pulse Shaping
JP2008172787A (en) Demodulating signal encoded according to ask modulation and psk modulation
JP2008187714A (en) SIGNAL MODULATION ACCORDING TO 2n-PSK MODULATION
CA2504865A1 (en) Transmitter for qam encoded data
JPH06311507A (en) Differential coding quater-phase transition modulation method, and method therefor
CA2121195A1 (en) Digital Signal Transmission Device for Improvement of Anti-Multipath Feature, a Method of the Same and Digital Signal Transmission Waveform
EP1411658A2 (en) Optical MSK transmitter
JP2944040B2 (en) Optical transmission system
US20240039636A1 (en) Two-Dimensional Optical Modulation And Detection Technologies For Optical Communications
US6385256B1 (en) Method and arrangement for signal modulation
KR100558237B1 (en) Transmitter for qam encoded data
WO2001086903A3 (en) Tetrahedron modem
US20020191271A1 (en) Generic optical modulator
JPH10322406A (en) Clock recovery system
TW348351B (en) Quadriphase-shift keying (QPSK) modulator
JPH06350561A (en) Data modulation system
JPH0377703B2 (en)

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 97195491.7

Country of ref document: CN

AK Designated states

Kind code of ref document: A2

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE HU IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TR TT UA UG UZ VN AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): GH KE LS MW SD SZ UG AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG

AK Designated states

Kind code of ref document: A3

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE HU IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TR TT UA UG UZ VN AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): GH KE LS MW SD SZ UG AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 1019980710071

Country of ref document: KR

ENP Entry into the national phase

Ref document number: 2257930

Country of ref document: CA

Ref document number: 2257930

Country of ref document: CA

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 1997925603

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1997925603

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWP Wipo information: published in national office

Ref document number: 1019980710071

Country of ref document: KR

WWG Wipo information: grant in national office

Ref document number: 1019980710071

Country of ref document: KR

WWG Wipo information: grant in national office

Ref document number: 1997925603

Country of ref document: EP