CA2108233A1 - Method and apparatus for reducing the peak-to-average power in multi-carrier rf communication systems - Google Patents

Method and apparatus for reducing the peak-to-average power in multi-carrier rf communication systems

Info

Publication number
CA2108233A1
CA2108233A1 CA2108233A CA2108233A CA2108233A1 CA 2108233 A1 CA2108233 A1 CA 2108233A1 CA 2108233 A CA2108233 A CA 2108233A CA 2108233 A CA2108233 A CA 2108233A CA 2108233 A1 CA2108233 A1 CA 2108233A1
Authority
CA
Canada
Prior art keywords
peak
carrier
reducing
average power
communication systems
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
Application number
CA2108233A
Other languages
French (fr)
Other versions
CA2108233C (en
Inventor
Bernard James Arntz
William Allen Nitz
Josef Ocenasek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2108233A1 publication Critical patent/CA2108233A1/en
Application granted granted Critical
Publication of CA2108233C publication Critical patent/CA2108233C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2621—Reduction thereof using phase offsets between subcarriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2637—Modulators with direct modulation of individual subcarriers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

Therefore a method and apparatus for controlling a linear amplifier processing a plurality of carrier signals of a multi channel carrier system alters the phases of one or more sources of the multi-channel signals in response to a detected peak envelope power or of a peak to average power ratio at regular scheduled intervals. This reduces the peak envelope power to average envelope power ratio and enables the reduction in the power rating required by the amplifiers handling the multi-channel signal.
CA002108233A 1992-10-20 1993-10-12 Method and apparatus for reducing the peak-to-average power in multi-carrier rf communication systems Expired - Fee Related CA2108233C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US964,596 1992-10-20
US07/964,596 US5302914A (en) 1992-10-20 1992-10-20 Method and apparatus for reducing the peak-to-average power in multi-carrier RF communication systems

Publications (2)

Publication Number Publication Date
CA2108233A1 true CA2108233A1 (en) 1994-04-21
CA2108233C CA2108233C (en) 1999-09-28

Family

ID=25508742

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002108233A Expired - Fee Related CA2108233C (en) 1992-10-20 1993-10-12 Method and apparatus for reducing the peak-to-average power in multi-carrier rf communication systems

Country Status (9)

Country Link
US (1) US5302914A (en)
EP (1) EP0594358B1 (en)
JP (1) JP2735469B2 (en)
AU (1) AU655375B2 (en)
CA (1) CA2108233C (en)
DE (1) DE69317202T2 (en)
ES (1) ES2114009T3 (en)
SG (1) SG42324A1 (en)
TW (1) TW225620B (en)

Families Citing this family (121)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1256225B (en) * 1992-12-23 1995-11-29 Sits Soc It Telecom Siemens PROCEDURE AND CIRCUIT FOR THE ADAPTIVE COMPENSATION OF THE GAIN DISTORTIONS OF A MICROWAVE AMPLIFIER WITH LINEARIZER
US5551070A (en) * 1993-01-28 1996-08-27 Telefonaktiebolaget Lm Ericsson Cartesian multicarrier feedback
US5854571A (en) * 1993-10-28 1998-12-29 Motorola Inc. Method and apparatus for controlling a peak envelope power of a power amplifier
TW280064B (en) * 1994-09-29 1996-07-01 Radio Frequency Systems Inc
TW293968B (en) * 1994-09-29 1996-12-21 Radio Frequency Systems Inc
US5625871A (en) * 1994-09-30 1997-04-29 Lucent Technologies Inc. Cellular communications system with multicarrier signal processing
US5570350A (en) * 1994-09-30 1996-10-29 Lucent Technologies Inc. CDMA cellular communications with multicarrier signal processing
KR960027576A (en) * 1994-12-01 1996-07-22 리차드 탤런 Wireless Signal Scanning and Targeting System for Land Mobile Wireless Base Sites
US5701596A (en) * 1994-12-01 1997-12-23 Radio Frequency Systems, Inc. Modular interconnect matrix for matrix connection of a plurality of antennas with a plurality of radio channel units
DE69534422T2 (en) * 1994-12-05 2006-07-06 Ntt Mobile Communications Network Inc. Signal multiplexer
EP0719001A1 (en) * 1994-12-22 1996-06-26 ALCATEL BELL Naamloze Vennootschap DMT modulator
US5835536A (en) * 1995-02-02 1998-11-10 Motorola, Inc. Method and apparatus for reducing peak-to-average requirements in multi-tone communication circuits
CA2188455C (en) * 1995-02-23 2003-07-15 Yukihiko Okumura Variable rate transmission method, transmitter and receiver using the same
EP0735731B1 (en) * 1995-03-31 2004-05-12 Victor Company Of Japan, Limited Multicarrier modulator demodulator, with arrangements for reducing peak power
GB2301751B (en) 1995-06-02 2000-02-09 Dsc Communications Control message transmission in telecommunications systems
US5745846A (en) * 1995-08-07 1998-04-28 Lucent Technologies, Inc. Channelized apparatus for equalizing carrier powers of multicarrier signal
US5872481A (en) * 1995-12-27 1999-02-16 Qualcomm Incorporated Efficient parallel-stage power amplifier
US5974041A (en) * 1995-12-27 1999-10-26 Qualcomm Incorporated Efficient parallel-stage power amplifier
US5694431A (en) * 1996-01-17 1997-12-02 Motorola, Inc. Method and apparatus for average power control
GB2309363B (en) * 1996-01-17 2000-07-12 Motorola Ltd Multicarrier communication system and method for peak power control
US5710990A (en) * 1996-03-21 1998-01-20 Motorola, Inc. Transmitter which adjusts peak-to-average power of a multicarrier signal by switching between a group of channels and a phase-adjusted group of channels
US5778307A (en) * 1996-03-29 1998-07-07 Motorola, Inc. Amplifier with adaptive output allocation and method thereof
US5815532A (en) * 1996-05-01 1998-09-29 Glenayre Electronics, Inc. Method and apparatus for peak-to-average ratio control in an amplitude modulation paging transmitter
GB2313525B (en) * 1996-05-24 2000-06-07 Motorola Ltd Filter for multicarrier communication system and method for peak power control therein
AU3567997A (en) * 1996-07-05 1998-02-02 Paulo Correa Controller-based radio frequency amplifier module and method
US6185182B1 (en) 1996-07-26 2001-02-06 Radio Frequency Systems, Inc. Power sharing amplifier system for a cellular communications system
DE19635813A1 (en) * 1996-09-04 1998-03-05 Johannes Prof Dr Ing Huber Process for reducing the peak value factor in digital transmission processes
US5862466A (en) * 1997-01-09 1999-01-19 Hewlett-Packard Company Method and apparatus for automatically balancing a radio-frequency mixer
US6018644A (en) * 1997-01-28 2000-01-25 Northrop Grumman Corporation Low-loss, fault-tolerant antenna interface unit
US5933421A (en) 1997-02-06 1999-08-03 At&T Wireless Services Inc. Method for frequency division duplex communications
US6085114A (en) 1997-02-06 2000-07-04 At&T Wireless Systems Inc. Remote wireless unit having reduced power operating mode
US6501771B2 (en) 1997-02-11 2002-12-31 At&T Wireless Services, Inc. Delay compensation
US6584144B2 (en) * 1997-02-24 2003-06-24 At&T Wireless Services, Inc. Vertical adaptive antenna array for a discrete multitone spread spectrum communications system
US6408016B1 (en) * 1997-02-24 2002-06-18 At&T Wireless Services, Inc. Adaptive weight update method and system for a discrete multitone spread spectrum communications system
US6359923B1 (en) * 1997-12-18 2002-03-19 At&T Wireless Services, Inc. Highly bandwidth efficient communications
US6859828B1 (en) * 1997-02-25 2005-02-22 Agilent Technologies, Inc. Bi-directional test system for network analysis
US6069525A (en) * 1997-04-17 2000-05-30 Qualcomm Incorporated Dual-mode amplifier with high efficiency and high linearity
JP4874449B2 (en) * 1997-06-17 2012-02-15 クゥアルコム・インコーポレイテッド Reduced maximum and average amplitude of multichannel links
US6175551B1 (en) * 1997-07-31 2001-01-16 Lucent Technologies, Inc. Transmission system and method employing peak cancellation to reduce the peak-to-average power ratio
US5966048A (en) * 1997-11-25 1999-10-12 Hughes Electronics Corporation Low IMD amplification method and apparatus
US6314146B1 (en) 1998-06-05 2001-11-06 The Board Of Trustees Of The Leland Stanford Junior University Peak to average power ratio reduction
US6512797B1 (en) * 1998-04-20 2003-01-28 The Board Of Trustees Of The Leland Stanford Junior University Peak to average power ratio reduction
US6424681B1 (en) * 1998-04-20 2002-07-23 The Board Of Trustees Of The Leland Stanford Junior University Peak to average power ratio reduction
JP3462388B2 (en) * 1998-04-28 2003-11-05 松下電器産業株式会社 Wireless communication device
US6381212B1 (en) 1998-06-17 2002-04-30 Radio Frequency Systems, Inc. Power sharing amplifier system for amplifying multiple input signals with shared power amplifiers
AU8730698A (en) * 1998-06-29 2000-01-17 Nokia Networks Oy Power control in a multi-carrier radio transmitter
US6445747B1 (en) 1998-07-14 2002-09-03 At&T Corporation Method and apparatus to reduce peak to average power ratio in multi-carrier modulation
US6069526A (en) * 1998-08-04 2000-05-30 Qualcomm Incorporated Partial or complete amplifier bypass
US6757299B1 (en) * 1998-09-24 2004-06-29 Silicon Automation Systems Limited Peak power to average power ratio reduction in multicarrier communication systems using error-correcting code
KR20000039982A (en) * 1998-12-16 2000-07-05 김영환 Apparatus for generating local frequency of base station in cdma communication system
US6166601A (en) * 1999-01-07 2000-12-26 Wiseband Communications Ltd. Super-linear multi-carrier power amplifier
JP2000269919A (en) * 1999-03-16 2000-09-29 Matsushita Electric Ind Co Ltd Ofdm communication unit
DE69939979D1 (en) 1999-04-06 2009-01-08 Mitsubishi Electric Corp SYSTEM AND DEVICE FOR MULTIPLEX TRANSMISSION IN A CDMA SYSTEM
US6166598A (en) * 1999-07-22 2000-12-26 Motorola, Inc. Power amplifying circuit with supply adjust to control adjacent and alternate channel power
US6438360B1 (en) 1999-07-22 2002-08-20 Motorola, Inc. Amplifier system with load control to produce an amplitude envelope
US6160449A (en) * 1999-07-22 2000-12-12 Motorola, Inc. Power amplifying circuit with load adjust for control of adjacent and alternate channel power
US6349216B1 (en) 1999-07-22 2002-02-19 Motorola, Inc. Load envelope following amplifier system
US6128350A (en) * 1999-08-24 2000-10-03 Usa Digital Radio, Inc. Method and apparatus for reducing peak to average power ratio in digital broadcasting systems
US6434135B1 (en) * 1999-08-31 2002-08-13 Interdigital Technology Corporation Adaptive RF amplifier prelimiter
GB2357647A (en) * 1999-12-24 2001-06-27 Nokia Networks Oy Multi-carrier TDMA base station where uniform transmission power across time slots is achieved by a method of allocation of new calls
US6825719B1 (en) * 2000-05-26 2004-11-30 Intel Corporation RF power amplifier and methods for improving the efficiency thereof
GB0015236D0 (en) * 2000-06-21 2000-08-16 Element 14 Inc Processing of multi-carrier signal
US7061990B2 (en) 2000-07-21 2006-06-13 Pmc-Sierra Inc. Systems and methods for the dynamic range compression of multi-bearer single-carrier and multi-carrier waveforms
US6957087B1 (en) 2000-10-19 2005-10-18 Telefonaktiebolaget Lm Ericsson (Publ) Power control in MCPA equipped base stations
GB2368737B (en) 2000-10-31 2004-11-10 Roke Manor Research Method and apparatus for controlling an amplifier
US6587511B2 (en) * 2001-01-26 2003-07-01 Intel Corporation Radio frequency transmitter and methods thereof
US6990153B1 (en) * 2001-02-06 2006-01-24 Agency For Science, Technology And Research Method and apparatus for semi-blind communication channel estimation
ATE471618T1 (en) 2001-02-27 2010-07-15 Huawei Tech Co Ltd METHOD AND DEVICE FOR MULTI CARRIER POWER CONTROL OF A BASE STATION IN A DIGITAL BROADBAND MOBILE COMMUNICATIONS SYSTEM
EP1365606A4 (en) * 2001-02-27 2010-05-05 Huawei Tech Co Ltd The apparatus and method for power control in digital mobile communication system broadband multi-carrier base station
WO2003003685A2 (en) * 2001-05-01 2003-01-09 Binj Technologies, Inc. Constant amplitude modulation for dsl
US7266354B2 (en) * 2001-06-25 2007-09-04 Telefonaktiebolaget Lm Ericsson (Publ) Reducing the peak-to-average power ratio of a communication signal
KR100547843B1 (en) * 2001-07-13 2006-02-01 삼성전자주식회사 Apparatus and method for controling transmission power in mobile telecommunications system
US7397860B1 (en) 2001-10-04 2008-07-08 Brooktree Broadband Holding, Inc. Fractional local peak detection and mitigation for PAR reduction
US7136423B1 (en) 2001-10-04 2006-11-14 Conexant, Inc. Side tones packets injection (STPI) for PAR reduction
US7054385B2 (en) * 2001-10-22 2006-05-30 Tropian, Inc. Reduction of average-to-minimum power ratio in communications signals
US20070211829A1 (en) * 2001-10-22 2007-09-13 Matsushita Electric Industrial Co., Ltd. Method and apparatus for pulse optimization for non-linear filtering
US8331490B2 (en) * 2001-10-22 2012-12-11 Panasonic Corporation Methods and apparatus for conditioning communications signals based on detection of high-frequency events in polar domain
US20030123566A1 (en) * 2001-12-27 2003-07-03 Jaime Hasson Transmitter having a sigma-delta modulator with a non-uniform polar quantizer and methods thereof
US20030125065A1 (en) * 2001-12-27 2003-07-03 Ilan Barak Method and apparatus for generating an output signal
US7336753B2 (en) 2003-06-26 2008-02-26 Marvell International Ltd. Transmitter
US7912145B2 (en) * 2003-12-15 2011-03-22 Marvell World Trade Ltd. Filter for a modulator and methods thereof
US7356315B2 (en) * 2003-12-17 2008-04-08 Intel Corporation Outphasing modulators and methods of outphasing modulation
US7391713B2 (en) * 2003-12-30 2008-06-24 Kiomars Anvari Phase rotation technique to reduce Crest Factor of multi-carrier signals
TWI249297B (en) * 2004-01-20 2006-02-11 Realtek Semiconductor Corp Method and apparatus for peak to average power ratio reduction
US7542517B2 (en) 2004-02-02 2009-06-02 Ibiquity Digital Corporation Peak-to-average power reduction for FM OFDM transmission
JP4429795B2 (en) * 2004-05-06 2010-03-10 株式会社エヌ・ティ・ティ・ドコモ Wireless communication system, wireless transmitter and wireless receiver
JP4469685B2 (en) * 2004-08-25 2010-05-26 富士通株式会社 Output power error absorption circuit and multi-carrier transmitter having the same
US7327803B2 (en) 2004-10-22 2008-02-05 Parkervision, Inc. Systems and methods for vector power amplification
US7355470B2 (en) 2006-04-24 2008-04-08 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including embodiments for amplifier class transitioning
US8334722B2 (en) 2007-06-28 2012-12-18 Parkervision, Inc. Systems and methods of RF power transmission, modulation and amplification
US7911272B2 (en) 2007-06-19 2011-03-22 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including blended control embodiments
EP2005580B1 (en) * 2006-04-10 2010-07-07 Telefonaktiebolaget LM Ericsson (PUBL) A method for compensating signal distortions in composite amplifiers
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
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
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
US7620129B2 (en) 2007-01-16 2009-11-17 Parkervision, Inc. RF power transmission, modulation, and amplification, including embodiments for generating vector modulation control signals
EP2147322B1 (en) * 2007-05-14 2013-03-06 Hittite Microwave Corporation Rf detector with crest factor measurement
WO2008156800A1 (en) 2007-06-19 2008-12-24 Parkervision, Inc. Combiner-less multiple input single output (miso) amplification with blended control
US7595688B2 (en) * 2007-10-31 2009-09-29 Raytheon Company High power commutating multiple output amplifier system
JP5049305B2 (en) * 2008-03-10 2012-10-17 アンリツ株式会社 Frequency converter
WO2009145887A1 (en) 2008-05-27 2009-12-03 Parkervision, Inc. Systems and methods of rf power transmission, modulation, and amplification
JP4996644B2 (en) * 2009-03-30 2012-08-08 アンリツ株式会社 Frequency converter
WO2012030319A2 (en) * 2009-06-26 2012-03-08 Hypres, Inc. System and method for controlling combined radio signals
US8536950B2 (en) 2009-08-03 2013-09-17 Qualcomm Incorporated Multi-stage impedance matching
US8102205B2 (en) 2009-08-04 2012-01-24 Qualcomm, Incorporated Amplifier module with multiple operating modes
EP2487790B1 (en) * 2009-10-06 2015-04-01 Fujitsu Limited Papr (peak-to-average power ratio) determining apparatus and communication apparatus
US9461688B2 (en) * 2010-03-12 2016-10-04 Sunrise Micro Devices, Inc. Power efficient communications
WO2012139126A1 (en) 2011-04-08 2012-10-11 Parkervision, Inc. Systems and methods of rf power transmission, modulation, and amplification
WO2012167111A2 (en) 2011-06-02 2012-12-06 Parkervision, Inc. Antenna control
US9577855B1 (en) * 2011-07-13 2017-02-21 Softronics, Ltd. Channelized multicarrier digitizer
CN102255699B (en) * 2011-08-22 2013-06-26 宁波大学 Method for framing and modulating anti-fading wireless multimedia broadcast signals
US8787873B1 (en) 2011-11-04 2014-07-22 Plusn Llc System and method for communicating using bandwidth on demand
JP5949781B2 (en) * 2011-12-19 2016-07-13 日本電気株式会社 Transmitting apparatus and radio signal transmitting method
EP2745484A4 (en) * 2012-01-12 2015-07-15 Ericsson Telefon Ab L M Adaptive phase shift apparatus and method
KR20160058855A (en) 2013-09-17 2016-05-25 파커비전, 인크. Method, apparatus and system for rendering an information bearing function of time
CN105814856B (en) 2013-11-26 2019-02-12 普鲁斯恩公司 Method, apparatus and system, the equipment of the multiple signals of combination of control combination waveform
GB201518859D0 (en) * 2015-10-23 2015-12-09 Airbus Defence & Space Ltd High-efficiency amplifier
WO2018132110A1 (en) * 2017-01-15 2018-07-19 Ecosense Lighting Inc. Lighting systems, and systems for determining periodic values of a phase angle of a waveform power input
US10483850B1 (en) 2017-09-18 2019-11-19 Ecosense Lighting Inc. Universal input-voltage-compatible switched-mode power supply
US11032112B2 (en) * 2019-10-18 2021-06-08 Motorola Solutions, Inc. Multi-carrier crest factor reduction
CN112422093A (en) * 2020-11-20 2021-02-26 成都沃特塞恩电子技术有限公司 Power synthesis method and device, electronic equipment and storage medium

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010426A (en) * 1975-11-12 1977-03-01 The United States Of America As Represented By The Secretary Of The Air Force Rf power amplifier parallel redundant system
US4064464A (en) * 1976-04-13 1977-12-20 Westinghouse Electric Corporation Amplitude stabilized power amplifier
US4370622A (en) * 1981-03-23 1983-01-25 Rockwell International Corporation IMD Limiter
US4546313A (en) * 1983-03-14 1985-10-08 The United States Of America As Represented By The United States Department Of Energy Peak power ratio generator
US5043673A (en) * 1989-03-31 1991-08-27 Mitsubishi Denki Kabushiki Kaisha Compensating circuit for a high frequency amplifier
JP2875811B2 (en) * 1989-05-19 1999-03-31 日本電信電話株式会社 Signal multiplexing circuit
US5045799A (en) * 1989-09-28 1991-09-03 Rockwell International Corporation Peak to average power ratio reduction in a power amplifier with multiple carrier input
JPH03198407A (en) * 1989-12-26 1991-08-29 Mitsubishi Electric Corp Linear amplifier
CA2046413C (en) * 1990-07-11 1994-01-04 Shoichi Narahashi Feed-forward amplifier
US5101211A (en) * 1991-01-10 1992-03-31 Hughes Aircraft Company Closed loop RF power amplifier output correction circuit
JPH05130191A (en) * 1991-10-31 1993-05-25 Nippon Motoroola Kk Peak/average value ratio reduction method by phase control of a multi-subchannel signal

Also Published As

Publication number Publication date
JP2735469B2 (en) 1998-04-02
TW225620B (en) 1994-06-21
EP0594358A3 (en) 1994-06-22
SG42324A1 (en) 1997-08-15
DE69317202T2 (en) 1998-06-25
AU655375B2 (en) 1994-12-15
AU4902193A (en) 1994-05-05
US5302914A (en) 1994-04-12
EP0594358B1 (en) 1998-03-04
DE69317202D1 (en) 1998-04-09
EP0594358A2 (en) 1994-04-27
CA2108233C (en) 1999-09-28
ES2114009T3 (en) 1998-05-16
JPH06204959A (en) 1994-07-22

Similar Documents

Publication Publication Date Title
CA2108233A1 (en) Method and apparatus for reducing the peak-to-average power in multi-carrier rf communication systems
AU1919392A (en) Method and system for calculating channel gain
AU6349386A (en) Radio telephone system and method for controlling same
AU4426396A (en) Wireless signal transmission systems, method and apparatus
AU5672294A (en) System and method for multiplexing data transmissions
AU583652B2 (en) Radio telephone system control apparatus and method
EP0660631A3 (en) Channel allocation system for communication systems and an apparatus thereof.
AU579717B2 (en) Hydraulic control system for cvt
AU4337900A (en) Methods, systems, and terminals for assigning control channel time slots for group and individual pages
AU557144B2 (en) Multi-channel access radio telephone system
AU6188486A (en) Radio telephone system control apparatus and method
AU5167896A (en) Method and apparatus for providing high bandwidth, low noise mechanical i/o for computer systems
AU3539089A (en) Ligase-based amplification method
AU4012789A (en) Channel ligament clamp and system
AU2003225815A1 (en) System and method for eliminating signal zero crossings in single and multiple channel communication systems
EP0599132A3 (en) System for processing an audio signal.
GB9217679D0 (en) Combiners for r.f.power amplifiers
AU584456B2 (en) Radio telephone system control apparatus and method
CA2094052A1 (en) System and method for transmission of bursts of digital information
AU3289893A (en) A system and method for combining multiple transmitters in a multi-channel cellular telephone communication system
EP0601888A3 (en) Variable gain RF amplifier with linear gain control.
AU1394788A (en) Rail transportation system with switches, especially a mono rail overhead system for cyclic conveyance of one or more carriers, e.g. in feeding systems
EP1176714A3 (en) Analog power control system for a multi-carrier transmitter
EP0778200A3 (en) Multi-stage space transport system and method for horizontal-takeoff
EP0910179A3 (en) Method and apparatus for spacecraft amplication of multichannel signals

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20021015