CA2036423A1 - Method of reducing the influence of fading of a viterbi receiver having at least two antennas - Google Patents

Method of reducing the influence of fading of a viterbi receiver having at least two antennas

Info

Publication number
CA2036423A1
CA2036423A1 CA2036423A CA2036423A CA2036423A1 CA 2036423 A1 CA2036423 A1 CA 2036423A1 CA 2036423 A CA2036423 A CA 2036423A CA 2036423 A CA2036423 A CA 2036423A CA 2036423 A1 CA2036423 A1 CA 2036423A1
Authority
CA
Canada
Prior art keywords
tij
delta
viterbi
signals
antennas
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
CA2036423A
Other languages
French (fr)
Other versions
CA2036423C (en
Inventor
Tomas Olof Backstrom
Ragnar Erik Kahre
Jan-Erik Stjernvall
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.)
Telefonaktiebolaget LM Ericsson AB
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 CA2036423A1 publication Critical patent/CA2036423A1/en
Application granted granted Critical
Publication of CA2036423C publication Critical patent/CA2036423C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/23—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using convolutional codes, e.g. unit memory codes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/39—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
    • H03M13/41—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors
    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • 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
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03184—Details concerning the metric
    • 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
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03331—Arrangements for the joint estimation of multiple sequences
    • 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
    • H04L25/0204—Channel estimation of multiple channels

Abstract

Signals in synchronizing sequences and data sequences are transmitted over a fading channel to a Viterbi-receiver (11, 12). The signals are received by antennas and sampled to received antenna signals (sin,r(k)). Part channel estimates (hest,r) for the individual antennas are formed. For Viterbi-analysis, assumed input signals (sa,r( DELTA Tij,k)) for the data sequence are produced with the aid of the part channel estimates (hest,r). Part metric values (mr( DELTA Tij,k)) are formed as a difference between the received antenna signal (s,in,r(k)) and corresponding assumed input signals (sa,r( DELTA Tij,k)) for Viterbi state transitions ( DELTA Tij). For one state transition there is formed a metric value such as the sum of a metric value ((M(Tj,k-1)) for an old state (Tj) at a preceding sampling time point (k-1) increased with a weighted (Kr) sum of the part metric values (mr( DELTA Tij,k)) belonging to individual part channel estimates (hest,r). Corresponding metric values are formed for all state transitions to the new state (Ti) and the smallest of these metric values is chosen in accordance with the Viterbi-algorithm.
CA002036423A 1990-02-16 1991-02-15 Method of reducing the influence of fading of a viterbi receiver having at least two antennas Expired - Lifetime CA2036423C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9000566A SE465597B (en) 1990-02-16 1990-02-16 PROCEDURE TO REDUCE THE EFFECT OF BREATHING ON A WHITE RECEIVER WITH AT LEAST TWO ANTENNA
SE9000566-1 1990-02-16

Publications (2)

Publication Number Publication Date
CA2036423A1 true CA2036423A1 (en) 1991-08-17
CA2036423C CA2036423C (en) 1996-12-17

Family

ID=20378589

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002036423A Expired - Lifetime CA2036423C (en) 1990-02-16 1991-02-15 Method of reducing the influence of fading of a viterbi receiver having at least two antennas

Country Status (15)

Country Link
US (1) US5191598A (en)
EP (1) EP0443997B1 (en)
JP (1) JP3113293B2 (en)
KR (1) KR960013962B1 (en)
CN (1) CN1025400C (en)
AT (1) ATE114906T1 (en)
AU (1) AU634629B2 (en)
CA (1) CA2036423C (en)
DE (1) DE69105298T2 (en)
DK (1) DK0443997T3 (en)
ES (1) ES2064981T3 (en)
HK (1) HK34495A (en)
MY (1) MY104741A (en)
NZ (1) NZ236924A (en)
SE (1) SE465597B (en)

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SE470371B (en) * 1992-06-23 1994-01-31 Ericsson Telefon Ab L M Methods and apparatus for digital signal transmission to estimate transmitted symbols at a receiver
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US5432821A (en) * 1992-12-02 1995-07-11 University Of Southern California System and method for estimating data sequences in digital transmissions
US5289499A (en) * 1992-12-29 1994-02-22 At&T Bell Laboratories Diversity for direct-sequence spread spectrum systems
US5414734A (en) * 1993-01-06 1995-05-09 Glenayre Electronics, Inc. Compensation for multi-path interference using pilot symbols
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US5563918A (en) * 1993-12-17 1996-10-08 Rockwell International Method of selecting optimum frequency in skywave communication apparatus
US6201801B1 (en) 1994-03-24 2001-03-13 Ericsson Inc. Polarization diversity phased array cellular base station and associated methods
US5832389A (en) * 1994-03-24 1998-11-03 Ericsson Inc. Wideband digitization systems and methods for cellular radiotelephones
US6151310A (en) * 1994-03-24 2000-11-21 Ericsson Inc. Dividable transmit antenna array for a cellular base station and associated method
US5499272A (en) * 1994-05-31 1996-03-12 Ericsson Ge Mobile Communications Inc. Diversity receiver for signals with multipath time dispersion
US5680419A (en) * 1994-08-02 1997-10-21 Ericsson Inc. Method of and apparatus for interference rejection combining in multi-antenna digital cellular communications systems
US5481572A (en) * 1994-08-02 1996-01-02 Ericsson Inc. Method of and apparatus for reducing the complexitiy of a diversity combining and sequence estimation receiver
US6081566A (en) * 1994-08-02 2000-06-27 Ericsson, Inc. Method and apparatus for interference rejection with different beams, polarizations, and phase references
US6173014B1 (en) 1994-08-02 2001-01-09 Telefonaktiebolaget Lm Ericsson Method of and apparatus for interference rejection combining and downlink beamforming in a cellular radio communications system
US5550872A (en) * 1994-10-24 1996-08-27 Motorola, Inc. Method and apparatus for Fast Fourier Transform based maximal ratio combining
US5586128A (en) * 1994-11-17 1996-12-17 Ericsson Ge Mobile Communications Inc. System for decoding digital data using a variable decision depth
US5903834A (en) * 1995-10-06 1999-05-11 Telefonaktiebolaget L/M Ericsson Distributed indoor digital multiple-access cellular telephone system
US5905742A (en) * 1995-12-27 1999-05-18 Ericsson Inc. Method and apparauts for symbol decoding
US6421543B1 (en) 1996-01-29 2002-07-16 Ericsson Inc. Cellular radiotelephone base stations and methods using selected multiple diversity reception
US5838739A (en) * 1996-03-29 1998-11-17 Ericsson Inc. Channel estimator circuitry, and associated method, for a digital communication system
US5796788A (en) * 1996-04-19 1998-08-18 Ericsson Inc. Method and apparatus for interference decorrelation in time and space
US5727028A (en) * 1996-07-31 1998-03-10 Motorola, Inc. Method and apparatus for receiving a signal in a digital radio frequency communication system
US5881073A (en) * 1996-09-20 1999-03-09 Ericsson Inc. Convolutional decoding with the ending state decided by CRC bits placed inside multiple coding bursts
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Also Published As

Publication number Publication date
SE465597B (en) 1991-09-30
SE9000566D0 (en) 1990-02-16
AU634629B2 (en) 1993-02-25
KR910016163A (en) 1991-09-30
CN1054156A (en) 1991-08-28
EP0443997B1 (en) 1994-11-30
DE69105298D1 (en) 1995-01-12
DE69105298T2 (en) 1995-04-13
MY104741A (en) 1994-05-31
CN1025400C (en) 1994-07-06
HK34495A (en) 1995-03-17
ATE114906T1 (en) 1994-12-15
ES2064981T3 (en) 1995-02-01
NZ236924A (en) 1993-03-26
JP3113293B2 (en) 2000-11-27
US5191598A (en) 1993-03-02
AU7107491A (en) 1991-08-22
DK0443997T3 (en) 1995-05-08
KR960013962B1 (en) 1996-10-10
JPH04215334A (en) 1992-08-06
CA2036423C (en) 1996-12-17
SE9000566L (en) 1991-08-17
EP0443997A1 (en) 1991-08-28

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