WO2008112587A3 - Quadrature imbalance mitigation using unbiased training sequences - Google Patents

Quadrature imbalance mitigation using unbiased training sequences Download PDF

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Publication number
WO2008112587A3
WO2008112587A3 PCT/US2008/056327 US2008056327W WO2008112587A3 WO 2008112587 A3 WO2008112587 A3 WO 2008112587A3 US 2008056327 W US2008056327 W US 2008056327W WO 2008112587 A3 WO2008112587 A3 WO 2008112587A3
Authority
WO
WIPO (PCT)
Prior art keywords
unbiased
training sequence
unbiased training
quadrature
training sequences
Prior art date
Application number
PCT/US2008/056327
Other languages
French (fr)
Other versions
WO2008112587A2 (en
Inventor
Rabih Chrabieh
Original Assignee
Qualcomm Inc
Rabih Chrabieh
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
Priority claimed from US11/684,566 external-priority patent/US8428175B2/en
Priority claimed from US11/755,719 external-priority patent/US8290083B2/en
Priority claimed from US11/853,809 external-priority patent/US8081695B2/en
Priority claimed from US11/853,808 external-priority patent/US8064550B2/en
Priority to KR1020097021111A priority Critical patent/KR101109797B1/en
Priority to BRPI0808676-1A priority patent/BRPI0808676A2/en
Priority to CA2678126A priority patent/CA2678126C/en
Priority to JP2009553707A priority patent/JP5123324B2/en
Application filed by Qualcomm Inc, Rabih Chrabieh filed Critical Qualcomm Inc
Priority to CN200880007614.5A priority patent/CN101641926B/en
Priority to EP08731756A priority patent/EP2130341A2/en
Publication of WO2008112587A2 publication Critical patent/WO2008112587A2/en
Publication of WO2008112587A3 publication Critical patent/WO2008112587A3/en

Links

Classifications

    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • 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
    • H04L25/05—Electric or magnetic storage of signals before transmitting or retransmitting for changing the transmission rate
    • 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
    • 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
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
    • H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
    • H04L27/3863—Compensation for quadrature error in the received signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0016—Stabilisation of local oscillators
    • 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

A system and method are provided for transmitting an unbiased communications training sequence. The method generates an unbiased training sequence in a quadrature modulation transmitter. The unbiased training sequence represents a uniform accumulated power evenly distributed in the complex plane. As a result, training information in the time domain is sent via an in-phase (I) modulation path having an accumulated power. Training information in the time domain is sent via a quadrature (Q) modulation path having an accumulated power equal to the I modulation path power. Also provided are system and method for calculating an unbiased channel estimate from a received unbiased training sequence.
PCT/US2008/056327 2007-03-09 2008-03-07 Quadrature imbalance mitigation using unbiased training sequences WO2008112587A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP08731756A EP2130341A2 (en) 2007-03-09 2008-03-07 Quadrature imbalance mitigation using unbiased training sequences
CN200880007614.5A CN101641926B (en) 2007-03-09 2008-03-07 Quadrature imbalance mitigation using unbiased training sequences
KR1020097021111A KR101109797B1 (en) 2007-03-09 2008-03-07 Quadrature imbalance mitigation using unbiased training sequences
JP2009553707A JP5123324B2 (en) 2007-03-09 2008-03-07 Orthogonal imbalance relaxation using unbiased training sequences
BRPI0808676-1A BRPI0808676A2 (en) 2007-03-09 2008-03-07 MITIGATION OF FRAMEWORK INSTABILITY USING BALANCED TRAINING SEQUENCES
CA2678126A CA2678126C (en) 2007-03-09 2008-03-07 Quadrature imbalance mitigation using unbiased training sequences

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US11/684,566 2007-03-09
US11/684,566 US8428175B2 (en) 2007-03-09 2007-03-09 Quadrature modulation rotating training sequence
US11/755,719 US8290083B2 (en) 2007-03-09 2007-05-30 Quadrature imbalance mitigation using unbiased training sequences
US11/755,719 2007-05-30
US11/853,808 2007-09-11
US11/853,808 US8064550B2 (en) 2007-03-09 2007-09-11 Quadrature imbalance estimation using unbiased training sequences
US11/853,809 US8081695B2 (en) 2007-03-09 2007-09-11 Channel estimation using frequency smoothing
US11/853,809 2007-09-11

Publications (2)

Publication Number Publication Date
WO2008112587A2 WO2008112587A2 (en) 2008-09-18
WO2008112587A3 true WO2008112587A3 (en) 2009-02-05

Family

ID=39760329

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2008/056327 WO2008112587A2 (en) 2007-03-09 2008-03-07 Quadrature imbalance mitigation using unbiased training sequences
PCT/US2008/056321 WO2008112585A2 (en) 2007-03-09 2008-03-07 Quadrature modulation rotating training sequence

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/US2008/056321 WO2008112585A2 (en) 2007-03-09 2008-03-07 Quadrature modulation rotating training sequence

Country Status (7)

Country Link
EP (2) EP2130341A2 (en)
JP (3) JP5290209B2 (en)
KR (2) KR101075288B1 (en)
BR (2) BRPI0808676A2 (en)
CA (3) CA2678592C (en)
TW (2) TWI393399B (en)
WO (2) WO2008112587A2 (en)

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US8385387B2 (en) * 2010-05-20 2013-02-26 Harris Corporation Time dependent equalization of frequency domain spread orthogonal frequency division multiplexing using decision feedback equalization
GB2492168A (en) 2011-06-24 2012-12-26 Penny & Giles Controls Ltd Inductive position sensor with datum adjustment
IL214096A (en) 2011-07-14 2016-02-29 Gideon Mor System for detection of meconium in amniotic fluid
US8971465B2 (en) 2012-03-30 2015-03-03 Qualcomm Incorporated Receiver-side estimation of and compensation for signal impairments
US9143365B2 (en) 2013-01-30 2015-09-22 Qualcomm Incorporated Channel estimation using averaging and interpolation
US9781612B2 (en) * 2014-03-31 2017-10-03 Intel IP Corporation Correlation-based self-interference suppression

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Also Published As

Publication number Publication date
CA2790073C (en) 2016-01-12
JP2010521124A (en) 2010-06-17
WO2008112585A3 (en) 2009-02-05
EP2130340A2 (en) 2009-12-09
TWI446758B (en) 2014-07-21
KR101109797B1 (en) 2012-04-06
JP5726939B2 (en) 2015-06-03
KR20090119002A (en) 2009-11-18
JP2010521123A (en) 2010-06-17
TW200901692A (en) 2009-01-01
CA2678126C (en) 2013-06-25
KR101075288B1 (en) 2011-10-19
TW200904093A (en) 2009-01-16
CA2678592A1 (en) 2008-09-18
CA2678126A1 (en) 2008-09-18
EP2130341A2 (en) 2009-12-09
TWI393399B (en) 2013-04-11
CA2678592C (en) 2013-06-18
JP5290209B2 (en) 2013-09-18
BRPI0808676A2 (en) 2014-08-12
KR20090118114A (en) 2009-11-17
JP5123324B2 (en) 2013-01-23
WO2008112585A2 (en) 2008-09-18
CA2790073A1 (en) 2008-09-18
JP2013176085A (en) 2013-09-05
BRPI0808669A2 (en) 2014-08-26
WO2008112587A2 (en) 2008-09-18

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