AU2001223770A1 - Method of clipping signal amplitudes in a modulation system - Google Patents

Method of clipping signal amplitudes in a modulation system

Info

Publication number
AU2001223770A1
AU2001223770A1 AU2001223770A AU2377001A AU2001223770A1 AU 2001223770 A1 AU2001223770 A1 AU 2001223770A1 AU 2001223770 A AU2001223770 A AU 2001223770A AU 2377001 A AU2377001 A AU 2377001A AU 2001223770 A1 AU2001223770 A1 AU 2001223770A1
Authority
AU
Australia
Prior art keywords
vector
limit
rotated
original
signals
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.)
Abandoned
Application number
AU2001223770A
Inventor
Kimmo Taskinen
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.)
Nokia Oyj
Original Assignee
Nokia Oyj
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 Nokia Oyj filed Critical Nokia Oyj
Publication of AU2001223770A1 publication Critical patent/AU2001223770A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • 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
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set

Abstract

Amplitudes of signals produced by a digital modulator can be clipped so that instead of processing the output vector of the digital modulator or it's component vectors, processing is applied to the base band I and Q signals prior to modulation. The I- and Q signals are applied to an input of a clipping circuit. Predetermined limit values are also applied to another input of the clipping circuit. The clipping circuit rotates on the I-Q vector towards the limit vector. At the same time the limit vector is rotated towards the I-Q vector. Rotations are performed by using Cordic algorithm. After rotations have been completed, the rotated I-Q vector is aligned with the original limit vector, and the rotated limit is aligned with the original I-Q vector. Then the length of the rotated I-Q vector will be compared with the original limit vector. If the rotated I-Q vector is shorter than the limit vector, then the original I-Q signals are output signals from the clipping circuit. But if the rotated original I-Q vector is longer than the limit vector, then the original I-Q signals will be rejected and substituted by the coordinate values of the rotated limit vector.
AU2001223770A 2000-12-14 2000-12-14 Method of clipping signal amplitudes in a modulation system Abandoned AU2001223770A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2000/001099 WO2002049308A1 (en) 2000-12-14 2000-12-14 Method of clipping signal amplitudes in a modulation system

Publications (1)

Publication Number Publication Date
AU2001223770A1 true AU2001223770A1 (en) 2002-06-24

Family

ID=8555886

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2001223770A Abandoned AU2001223770A1 (en) 2000-12-14 2000-12-14 Method of clipping signal amplitudes in a modulation system

Country Status (10)

Country Link
US (1) US6879642B2 (en)
EP (1) EP1252751B1 (en)
JP (1) JP3638585B2 (en)
CN (1) CN1158826C (en)
AT (1) ATE318518T1 (en)
AU (1) AU2001223770A1 (en)
BR (1) BR0016858A (en)
DE (1) DE60026605T2 (en)
ES (2) ES2260076T3 (en)
WO (1) WO2002049308A1 (en)

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KR20040028301A (en) * 2002-09-30 2004-04-03 주식회사 현대시스콤 Magnitude calculate method for clipping in a IMT-2000 system
US7161975B2 (en) * 2002-11-27 2007-01-09 International Business Machines Corporation Enhancing CDMA multiuser detection by constraining soft decisions
US7545874B1 (en) 2004-04-05 2009-06-09 National Semiconductor Corporation Apparatus for pre-scaling data packets with multiple signal gain coefficients in a SIMO/MISO transceiver for communication with a SISO transceiver
US7394861B1 (en) * 2004-04-05 2008-07-01 National Semiconductor Corporation Apparatus for generating signal gain coefficients for a SIMO/MISO transceiver for providing packet data communication with a SISO transceiver
JP4424081B2 (en) * 2004-06-14 2010-03-03 ミツミ電機株式会社 Amplitude modulation apparatus, amplitude limiting method, and computer-readable program
GB2432981B (en) * 2005-11-30 2007-12-27 Motorola Inc Apparatus and method for amplitude variation reduction of a signal
CN101237435B (en) * 2007-01-30 2012-03-28 中兴通讯股份有限公司 A method and device for reducing multi-carrier signal peak equal ratio
CN101483627B (en) * 2008-01-07 2011-05-11 中兴通讯股份有限公司 Method for reducing PAR of carrier signal
JP2009281883A (en) * 2008-05-22 2009-12-03 Toshiba Mach Co Ltd Speed detector and servomotor
US8059697B2 (en) * 2008-07-02 2011-11-15 Telefonaktiebolaget L M Ericsson (Publ) Reduced peak-to-RMS ratio multicode signal
KR20120028915A (en) * 2009-05-11 2012-03-23 아키타 블루, 인크. Extraction of common and unique components from pairs of arbitrary signals
US8774315B2 (en) * 2009-08-25 2014-07-08 The Aerospace Corporation Phase-optimized constant envelope transmission (POCET) method, apparatus and system
KR101704021B1 (en) * 2009-12-22 2017-02-07 에릭슨 엘지 주식회사 Method for clipping of digital signal and apparatus for the same
CN101917164A (en) * 2010-07-16 2010-12-15 航天恒星科技有限公司 CORDIC algorithm-based signal processing method
CN104954094B (en) * 2014-03-28 2018-01-23 华为技术有限公司 Signal limiter method and apparatus
DE102014113922B4 (en) 2014-09-25 2021-10-14 Apple Inc. Digital-to-analog converter circuits, transmitters and methods for generating a radio frequency transmission signal and methods of digital-to-analog conversion
US9985811B2 (en) * 2016-09-23 2018-05-29 Intel IP Corporation PAPR reduction for IQ RFDAC
CN110800264A (en) 2017-06-09 2020-02-14 纳诺塞米有限公司 Crest factor reduction
WO2019094713A1 (en) 2017-11-13 2019-05-16 Nanosemi, Inc. Spectrum shaping crest factor reduction
US10826739B1 (en) 2019-08-01 2020-11-03 Nanosemi, Inc. Systems and methods for efficient clipping in crest factor reduction processes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19824233B4 (en) * 1998-05-29 2005-10-06 Telefonaktiebolaget Lm Ericsson (Publ) amplitude limiting
US6192089B1 (en) * 1998-08-07 2001-02-20 Motorola, Inc. Electronic circuit and method for automatic frequency control
SE514948C2 (en) * 1999-03-29 2001-05-21 Ericsson Telefon Ab L M Method and apparatus for reducing crosstalk
DE19947019A1 (en) * 1999-09-30 2001-06-07 Infineon Technologies Ag Method and device for generating spread-coded signals

Also Published As

Publication number Publication date
ES2260087T3 (en) 2006-11-01
CN1387718A (en) 2002-12-25
EP1252751B1 (en) 2006-03-08
US6879642B2 (en) 2005-04-12
ATE318518T1 (en) 2006-03-15
JP3638585B2 (en) 2005-04-13
WO2002049308A1 (en) 2002-06-20
DE60026605T2 (en) 2006-08-10
BR0016858A (en) 2002-10-01
JP2004516716A (en) 2004-06-03
ES2260076T3 (en) 2006-11-01
EP1252751A1 (en) 2002-10-30
DE60026605D1 (en) 2006-05-04
CN1158826C (en) 2004-07-21
US20020197966A1 (en) 2002-12-26

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