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AU2001275988A1 - Method and apparatus for processing a modulated signal using an equalizer and a rake receiver - Google Patents

Method and apparatus for processing a modulated signal using an equalizer and a rake receiver

Info

Publication number
AU2001275988A1
AU2001275988A1 AU2001275988A AU7598801A AU2001275988A1 AU 2001275988 A1 AU2001275988 A1 AU 2001275988A1 AU 2001275988 A AU2001275988 A AU 2001275988A AU 7598801 A AU7598801 A AU 7598801A AU 2001275988 A1 AU2001275988 A1 AU 2001275988A1
Authority
AU
Australia
Prior art keywords
sample stream
combined
generate
scaled
processing scheme
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
AU2001275988A
Inventor
Ahmad Jalali
John E. Smee
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.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
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 Qualcomm Inc filed Critical Qualcomm Inc
Publication of AU2001275988A1 publication Critical patent/AU2001275988A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03611—Iterative algorithms
    • H04L2025/03617—Time recursive algorithms
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03611—Iterative algorithms
    • H04L2025/03656—Initialisation
    • H04L2025/03662—Initialisation to a fixed value
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Circuits Of Receivers In General (AREA)
  • Selective Calling Equipment (AREA)

Abstract

In a method for achieving higher S/N, one or more signals are received and processed to provide one or more streams of samples. In a first processing scheme, the sample stream(s) are equalized and combined within an equalizer to generate symbol estimates, which maybe subsequently processed (e.g. despread and decovered) to provide a first stream of recovered symbols. The sample stream(s) may be equalized prior to being combined. In this case, each sample stream is filtered with a set of coefficients and may be scaled with a scaling factor. The scaled samples for all streams are then combined to generate the symbol estimates. Alternatively, the sample stream(s) may be combined prior to being equalized. In this case, each sample stream is scaled by a scaling factor. The scaled samples for all streams are then combined to generate summed samples that are further filtered with a set of coefficients to generate the symbol estimates. The sample stream(s) may also be processed by a second processing scheme with one or more rake receivers to provide a second stream of recovered symbols. The signal quality for each processing scheme can be estimated and used to select either the first or second processing scheme.
AU2001275988A 2000-07-24 2001-07-17 Method and apparatus for processing a modulated signal using an equalizer and a rake receiver Abandoned AU2001275988A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/624,319 US7082174B1 (en) 2000-07-24 2000-07-24 Method and apparatus for processing a modulated signal using an equalizer and a rake receiver
US09624319 2000-07-24
PCT/US2001/022756 WO2002009305A2 (en) 2000-07-24 2001-07-17 Method and apparatus for processing a modulated signal using an equalizer and a rake receiver

Publications (1)

Publication Number Publication Date
AU2001275988A1 true AU2001275988A1 (en) 2002-02-05

Family

ID=24501523

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2001275988A Abandoned AU2001275988A1 (en) 2000-07-24 2001-07-17 Method and apparatus for processing a modulated signal using an equalizer and a rake receiver

Country Status (11)

Country Link
US (2) US7082174B1 (en)
EP (2) EP1981174B1 (en)
JP (1) JP4938201B2 (en)
KR (1) KR100809888B1 (en)
CN (1) CN1284308C (en)
AT (1) ATE403977T1 (en)
AU (1) AU2001275988A1 (en)
BR (1) BR0112677A (en)
DE (1) DE60135228D1 (en)
TW (1) TW541813B (en)
WO (1) WO2002009305A2 (en)

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Also Published As

Publication number Publication date
EP1981174A2 (en) 2008-10-15
EP1303920A2 (en) 2003-04-23
US7397844B2 (en) 2008-07-08
KR100809888B1 (en) 2008-03-07
JP4938201B2 (en) 2012-05-23
WO2002009305A3 (en) 2002-05-23
EP1981174B1 (en) 2012-12-05
ATE403977T1 (en) 2008-08-15
HK1056796A1 (en) 2004-02-27
CN1284308C (en) 2006-11-08
EP1981174A3 (en) 2009-10-21
CN1449603A (en) 2003-10-15
EP1303920B1 (en) 2008-08-06
JP2004505491A (en) 2004-02-19
DE60135228D1 (en) 2008-09-18
WO2002009305A2 (en) 2002-01-31
TW541813B (en) 2003-07-11
US7082174B1 (en) 2006-07-25
KR20030017654A (en) 2003-03-03
BR0112677A (en) 2006-09-12
US20060056496A1 (en) 2006-03-16

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