CA2574009A1 - System and method for enlarging amplitude minima in a linear modulation signal - Google Patents

System and method for enlarging amplitude minima in a linear modulation signal Download PDF

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Publication number
CA2574009A1
CA2574009A1 CA002574009A CA2574009A CA2574009A1 CA 2574009 A1 CA2574009 A1 CA 2574009A1 CA 002574009 A CA002574009 A CA 002574009A CA 2574009 A CA2574009 A CA 2574009A CA 2574009 A1 CA2574009 A1 CA 2574009A1
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CA
Canada
Prior art keywords
modulation signal
minimum amplitude
linear modulation
local minimum
amplitude value
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
CA002574009A
Other languages
French (fr)
Other versions
CA2574009C (en
Inventor
Young-Seo Park
Lavanya Dodlatyvenkata
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.)
Motorola Solutions Inc
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 CA2574009A1 publication Critical patent/CA2574009A1/en
Application granted granted Critical
Publication of CA2574009C publication Critical patent/CA2574009C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
    • 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
    • H04L27/2623—Reduction thereof by clipping

Abstract

A system and a method to enlarge the minimum signal of a linear modulation signal (115) including multi-carrier modulation, such as Scalable advanced Modulation or Orthogonal Frequency Division Multiplexing, are disclosed. A
minimum enlarger (120) exploits a simple amplitude limiter (220) so as not to interfere with an existing peak suppression scheme. The amplitude limiter (220) enlarges local minimum amplitude values to a predetermined minimum amplitude threshold if the local minimum amplitude values are less than the predetermined minimum amplitude threshold. While the amplitude limiter (220) adjusts the local minimum amplitude values in the linear modulation signal (115), the phase of the linear modulation signal (115) is maintained. The conditioned linear modulation signal (125) increases the efficiency of a linear power amplifier (130). The spectral change of the linear modulation signal due to the disclosed scheme is negligible because the adjusted signal power is negligible.

Claims (10)

1. A digital transmitter, comprising:

a modulator for providing a linear modulation signal characterized by amplitude and phase; and a minimum enlarger for receiving the linear modulation signal, wherein the minimum enlarger comprises:

a detector for detecting a local minimum amplitude value in the linear modulation signal;

a comparator for comparing the local minimum amplitude value with a predetermined minimum amplitude threshold; and an amplitude limiter for adjusting the local minimum amplitude value to the predetermined minimum amplitude threshold while maintaining the phase of the linear modulation signal, when the local minimum amplitude value is less than the predetermined minimum amplitude threshold, thereby providing an adjusted linear modulation signal.
2. The digital transmitter of claim 1, wherein the amplitude limiter adjusts the local minimum amplitude value by scaling the local minimum amplitude value to the predetermined minimum amplitude threshold.
3. The digital transmitter of claim 1, wherein the amplitude limiter adjusts the local minimum amplitude value by replacing the local minimum amplitude value with the predetermined minimum amplitude threshold.
4. The digital transmitter of claim 3, wherein the amplitude limiter replaces the local minimum amplitude value by applying an amplitude limiter function.
5. The digital transmitter of claim 1, wherein the minimum enlarger further comprises a means for normalizing that divides the adjusted linear modulation signal by a root mean square of the adjusted linear modulation signals to maintain an equivalent total signal power at an input and an output of the amplitude limiter.
6. The digital transmitter of claim 1 further comprising a linear power amplifier requiring a limited dynamic range that is provided by the minimum enlarger.
7. The digital transmitter of claim 1, wherein the linear modulation signal includes a multi-carrier modulation signal.
8. The digital transmitter of claim 7, wherein the multi-carrier modulation signal includes a Scalable Advanced Modulation (SAM) signal.
9. The digital transmitter of claim 7, wherein the multi-carrier modulation signal includes an Orthogonal Frequency Division Multiplexing (OFDM) signal.
10. A method for enlarging a local minimum amplitude value in a linear modulation signal characterized by amplitude and phase, the method comprising:

providing a predetermined minimum amplitude threshold for the linear modulation signal;

detecting a local minimum amplitude value in the linear modulation signal;
comparing the local minimum amplitude value with the predetermined minimum amplitude threshold; and adjusting the local minimum amplitude value to the predetermined minimum amplitude threshold when the local minimum amplitude value is less than the predetermined minimum amplitude threshold while maintaining the phase of the linear modulation signal.
CA2574009A 2005-06-01 2006-05-25 System and method for enlarging amplitude minima in a linear modulation signal Expired - Fee Related CA2574009C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/142,107 US7453953B2 (en) 2005-06-01 2005-06-01 System and method for enlarging amplitude minima in a linear modulation signal
US11/142,107 2005-06-01
PCT/US2006/020438 WO2006130465A2 (en) 2005-06-01 2006-05-25 System and method for enlarging amplitude minima in a linear modulation signal

Publications (2)

Publication Number Publication Date
CA2574009A1 true CA2574009A1 (en) 2006-12-07
CA2574009C CA2574009C (en) 2011-03-08

Family

ID=37482174

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2574009A Expired - Fee Related CA2574009C (en) 2005-06-01 2006-05-25 System and method for enlarging amplitude minima in a linear modulation signal

Country Status (5)

Country Link
US (1) US7453953B2 (en)
EP (1) EP1889437A4 (en)
CN (1) CN101080908B (en)
CA (1) CA2574009C (en)
WO (1) WO2006130465A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8189724B1 (en) * 2005-10-26 2012-05-29 Zenith Electronics Llc Closed loop power normalized timing recovery for 8 VSB modulated signals
US8683527B2 (en) * 2007-04-20 2014-03-25 At&T Intellectual Property I, Lp System and apparatus for supplying media content to portable communication devices
US8583061B2 (en) 2011-11-04 2013-11-12 Motorola Solutions, Inc. Peak suppression on multicarrier
CN104467878B (en) * 2013-09-16 2017-06-16 华为技术有限公司 Signal amplitude adjusting method and communication terminal
US9742608B2 (en) * 2015-05-29 2017-08-22 Huawei Technologies Co., Ltd. Low PAPR waveform for mmW

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5846738A (en) * 1981-09-11 1983-03-18 Sony Corp Amplitude limiter
US5469127A (en) * 1992-08-04 1995-11-21 Acrodyne Industries, Inc. Amplification apparatus and method including modulator component
DE4319315A1 (en) * 1993-06-11 1994-12-15 Sel Alcatel Ag Optical transmitter for the common transmission of analog signals and digital QAM signals
JP2718398B2 (en) * 1995-06-30 1998-02-25 日本電気株式会社 CDMA base station transmitter
JP3548657B2 (en) * 1996-10-17 2004-07-28 株式会社日立製作所 Multiplex signal transmitter
US6005894A (en) * 1997-04-04 1999-12-21 Kumar; Derek D. AM-compatible digital broadcasting method and system
US6242975B1 (en) * 1999-05-25 2001-06-05 Conexant Systems, Inc. Envelope peak and trough limiting to improve amplifier efficiency and distortion characteristics
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
US7065150B2 (en) * 2003-06-16 2006-06-20 Motorola, Inc. System and method for generating a root raised cosine orthogonal frequency division multiplexing (RRC OFDM) modulation

Also Published As

Publication number Publication date
WO2006130465A2 (en) 2006-12-07
EP1889437A4 (en) 2010-06-16
CN101080908A (en) 2007-11-28
CA2574009C (en) 2011-03-08
US20060274851A1 (en) 2006-12-07
US7453953B2 (en) 2008-11-18
WO2006130465A3 (en) 2007-05-03
CN101080908B (en) 2012-03-21
EP1889437A2 (en) 2008-02-20

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Effective date: 20210525