WO2009098166A3 - Whitening channel estimate by cholesky factorization - Google Patents

Whitening channel estimate by cholesky factorization Download PDF

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Publication number
WO2009098166A3
WO2009098166A3 PCT/EP2009/051018 EP2009051018W WO2009098166A3 WO 2009098166 A3 WO2009098166 A3 WO 2009098166A3 EP 2009051018 W EP2009051018 W EP 2009051018W WO 2009098166 A3 WO2009098166 A3 WO 2009098166A3
Authority
WO
WIPO (PCT)
Prior art keywords
channel estimates
whitening
whitened
received signal
squares problem
Prior art date
Application number
PCT/EP2009/051018
Other languages
French (fr)
Other versions
WO2009098166A2 (en
Inventor
Douglas Cairns
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
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 Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to EP09707254A priority Critical patent/EP2250776B1/en
Publication of WO2009098166A2 publication Critical patent/WO2009098166A2/en
Publication of WO2009098166A3 publication Critical patent/WO2009098166A3/en

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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
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
    • H04L25/0246—Channel estimation channel estimation algorithms using matrix methods with factorisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7105—Joint detection techniques, e.g. linear detectors
    • H04B1/71052—Joint detection techniques, e.g. linear detectors using decorrelation matrix
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/712—Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/7097—Direct sequence modulation interference
    • H04B2201/709727—GRAKE type RAKE receivers
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

Teachings presented herein present a 'whitening' channel estimation method and apparatus that produce high-quality net channel estimates for processing a received signal, such as a received CDMA signal. Processing includes forming an initial least squares problem (for medium channel estimates) using known pilot values and corresponding pilot observations for the received signal, transforming the initial least squares problem using a whitening transformation term, and solving the transformed least squares problem to obtain whitened medium channel estimates. The whitening transformation term may be determined, for example, by carrying out a Cholesky factorization of a (traffic) data correlation matrix, which can be obtained from traffic data values for the received signal. Processing further includes converting the whitened medium channel estimates into whitened net channel estimates, which consider the effects of transmit/receive filtering.
PCT/EP2009/051018 2008-02-07 2009-01-29 A method and apparatus for channel estimation for communications signal processing WO2009098166A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09707254A EP2250776B1 (en) 2008-02-07 2009-01-29 Whitening channel estimate by Cholesky factorization

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/027,492 US7929629B2 (en) 2008-02-07 2008-02-07 Method and apparatus for improved channel estimation for communications signal processing
US12/027,492 2008-02-07

Publications (2)

Publication Number Publication Date
WO2009098166A2 WO2009098166A2 (en) 2009-08-13
WO2009098166A3 true WO2009098166A3 (en) 2010-02-18

Family

ID=40938855

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/051018 WO2009098166A2 (en) 2008-02-07 2009-01-29 A method and apparatus for channel estimation for communications signal processing

Country Status (3)

Country Link
US (1) US7929629B2 (en)
EP (1) EP2250776B1 (en)
WO (1) WO2009098166A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8259864B2 (en) * 2009-02-06 2012-09-04 Qualcomm Incorporated Methods and systems for fourier-quadratic basis channel estimation in OFDMA systems
US8306165B2 (en) * 2009-04-29 2012-11-06 Qualcomm Incorporated Traffic-to-pilot ratio estimation for MIMO-OFDM system
US8879657B2 (en) * 2012-09-07 2014-11-04 Samsung Electronics Co., Ltd. Communication system with whitening feedback mechanism and method of operation thereof
CN103902762B (en) * 2014-03-11 2016-11-16 复旦大学 A kind of carry out the circuit structure that least squares equation solves for positive definite symmetric matrices

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WO2006067258A1 (en) * 2004-12-20 2006-06-29 Nokia Siemens Networks Oy Interference suppression in radio receivers
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EP1821445A1 (en) * 2006-02-16 2007-08-22 Siemens S.p.A. Method to improve the channel estimate in broadband simo/mimo cellular radio networks during abrupt interference variations

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US6363104B1 (en) * 1998-10-02 2002-03-26 Ericsson Inc. Method and apparatus for interference cancellation in a rake receiver
US6470044B1 (en) 1999-01-15 2002-10-22 Sharp Laboratories Of America, Inc. Computationally parsimonious forward link receiver for DS-CDMA systems and method for same
US6792052B1 (en) 2000-11-22 2004-09-14 Telefonaktiebolaget Lm Ericsson Joint least-square synchronization, channel estimation and noise estimation
GB0107113D0 (en) * 2001-03-21 2001-05-09 Nokia Networks Oy Interference rejection in a receiver
EP1300999A1 (en) 2001-10-05 2003-04-09 Siemens Information and Communication Networks S.p.A. Channel estimation
US6757321B2 (en) * 2002-05-22 2004-06-29 Interdigital Technology Corporation Segment-wise channel equalization based data estimation
KR100983297B1 (en) * 2003-01-10 2010-09-24 인터디지탈 테크날러지 코포레이션 Generalized Two-stage Data Estimation
FI20031609A0 (en) * 2003-11-06 2003-11-06 Nokia Corp Communication method, receiver and base station
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US7536158B2 (en) * 2004-03-29 2009-05-19 Telefonaktiebolaget Lm Ericsson (Publ) Impairment correlation estimation in a spread spectrum system
US8867676B2 (en) * 2004-09-17 2014-10-21 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for controlling interference suppressing receivers
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WO2006067258A1 (en) * 2004-12-20 2006-06-29 Nokia Siemens Networks Oy Interference suppression in radio receivers
WO2007000620A1 (en) * 2005-06-28 2007-01-04 Telefonaktiebolaget Lm Ericsson (Publ) Method and device for synchronization and channel estimation in a radio receiver
EP1821445A1 (en) * 2006-02-16 2007-08-22 Siemens S.p.A. Method to improve the channel estimate in broadband simo/mimo cellular radio networks during abrupt interference variations

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Also Published As

Publication number Publication date
WO2009098166A2 (en) 2009-08-13
EP2250776B1 (en) 2012-12-26
US7929629B2 (en) 2011-04-19
US20090202005A1 (en) 2009-08-13
EP2250776A2 (en) 2010-11-17

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