HK34495A - A method of reducing the influence of fading of a viterbi-receiver having at least two antennas - Google Patents

A method of reducing the influence of fading of a viterbi-receiver having at least two antennas Download PDF

Info

Publication number
HK34495A
HK34495A HK34495A HK34495A HK34495A HK 34495 A HK34495 A HK 34495A HK 34495 A HK34495 A HK 34495A HK 34495 A HK34495 A HK 34495A HK 34495 A HK34495 A HK 34495A
Authority
HK
Hong Kong
Prior art keywords
viterbi
signals
metric values
antennas
state
Prior art date
Application number
HK34495A
Other languages
German (de)
English (en)
Inventor
Tomas Olof Baeckstroem
Ragnar Erik Kahre
Jan-Erik Stoernvall
Original Assignee
Telefonaktiebolaget L M Ericsson
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 filed Critical Telefonaktiebolaget L M Ericsson
Publication of HK34495A publication Critical patent/HK34495A/en

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Probability & Statistics with Applications (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Error Detection And Correction (AREA)
  • Radio Transmission System (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Details Of Aerials (AREA)
  • Noise Elimination (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Claims (5)

  1. Un procédé pour réduire l'influence de l'évanouissement dans un récepteur de Viterbi ayant au moins deux antennes, ce récepteur recevant des signaux radioélectriques sur un canal qui est sujet à des perturbations, ce procédé comprenant les étapes suivantes :
    - on reçoit les signaux sur les antennes, qui sont mutuellement espacées,
    - on échantillonne les signaux reçus à partir des antennes, pour donner des signaux d'antenne reçus,
    - on forme une estimation de canal, qui est une estimation de la fonction de transmission du canal, et
    - on effectue dans l'égaliseur du récepteur de Viterbi un traitement de signal, conformément à l'algorithme de Viterbi, dans lequel on suppose des symboles pour les transitions d'états de l'algorithme de Viterbi, caractérisé en ce que l'estimation de canal comprend au moins deux (R) estimations de canal partielles (hest,r) appartenant à des antennes individuelles (4), le procédé comprenant les étapes supplémentaires suivantes, à un instant d'échantillonnage indiqué (k) :
    - on forme des signaux d'entrée supposés (sa,r(ΔTij,k)) à partir des symboles supposés (S(ΔTij)), à l'aide des estimations de canal partielles (hest,r), un signal d'entrée supposé (sa,r(ΔTij, k)) pour les estimations de canal partielles individuelles (hest,r) étant formé pour chaque transition d'états (ΔTij) de l'algorithme de Viterbi,
    - on forme des valeurs de métrique partielle (mr(ΔTij,k)) pour les estimations de canal partielles individuelles (hest,r), sous la dépendance du signal d'antenne reçu (sin,r(k)) qui correspond à l'estimation de canal partielle et aux signaux d'entrée supposés correspondants (sa,r(ΔTij,k)),
    - on forme pour une transition d'états indiquée (ΔTij) entre un ancien état (Tj) et un nouvel état (Ti) dans l'algorithme de Viterbi, une valeur de métrique M(ΔTij,k)), telle qu'une valeur de métrique (M(Tj,k-1)) choisie conformément à l'algorithme de Viterbi pour l'ancien état (Tj) à un instant d'échantillonnage (k-1) qui précède l'instant d'échnantillonnage indiqué (k), augmentée par une somme pondérée (Kr) des valeurs de métrique partielle (mr(ΔTij,k)) correspondant aux estimations de canal partielles individuelles (hest,r), et
    - on forme des valeurs de métrique, correspondant à la valeur de métrique (M(ΔTij,k)) pour la transition d'états indiquée (ΔTij), pour toutes les transitions d'états (ΔTij) vers le nouvel état (Ti) et on sélectionne, conformément à l'algorithme de Viterbi, la plus petite (M(Tj,k)) de ces valeurs de métrique (M(ΔTij,k)) à la transition vers le nouvel état (Ti).
  2. Un procédé selon la revendication 1, caractérisé en ce qu'on forme les valeurs de métrique partielle individuelles (mr(Δ Tij,k)) sous la dépendance d'une valeur absolue de la différence entre le signal d'antenne reçu (sin,r(k)) et les signaux d'entrée supposés correspondants (sa,r(ΔTij,k)).
  3. Un procédé selon la revendication 1 ou la revendication 2, caractérisé en ce que tous les coefficients (Kr) pour la pondération des valeurs de métrique partielle (mr(ΔTij,k)) ont mutuellement les mêmes valeurs (Kr=P/R).
  4. Un procédé selon la revendication 1 ou la revendication 2, caractérisé en ce qu'on choisit les coefficients (Kr) pour la pondération des valeurs de métrique partielle (mr(ΔTij,k)) sous la dépendance de l'amplitude des signaux d'antenne reçus correspondants (sin,r(k)).
  5. Un procédé selon la revendication 4, caractérisé en ce que les coefficients (Kr) pour la pondération des valeurs de métrique partielle (mr(ΔTij,k)) sont proportionnelles (c) à l'énergie des signaux d'antenne reçus (sin,r(k)).
HK34495A 1990-02-16 1995-03-09 A method of reducing the influence of fading of a viterbi-receiver having at least two antennas HK34495A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9000566A SE465597B (sv) 1990-02-16 1990-02-16 Foerfarande att reducera inverkan av faedning hos en viterbimottagare med minst tvaa antenner

Publications (1)

Publication Number Publication Date
HK34495A true HK34495A (en) 1995-03-17

Family

ID=20378589

Family Applications (1)

Application Number Title Priority Date Filing Date
HK34495A HK34495A (en) 1990-02-16 1995-03-09 A method of reducing the influence of fading of a viterbi-receiver having at least two antennas

Country Status (15)

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

Families Citing this family (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5436928A (en) * 1991-04-08 1995-07-25 Nippon Telegraph And Telephone Corporation Method and apparatus for equalizing transmission line characteristics which vary at high speed in mobile radio communication
DE4135953A1 (de) * 1991-10-31 1993-05-06 Rohde & Schwarz Gmbh & Co Kg, 8000 Muenchen, De Verfahren zum bestimmen der komplexen impulsantwort eines funkkanals
DE59208453D1 (de) * 1991-12-07 1997-06-12 Philips Patentverwaltung Mobilfunkempfänger dessen verbesserte Anfangssysnchronisation mit einer Feststation durch Frequenzschätzung mittels Impulserkennung erreicht wird
US5862192A (en) * 1991-12-31 1999-01-19 Lucent Technologies Inc. Methods and apparatus for equalization and decoding of digital communications channels using antenna diversity
CA2083304C (fr) * 1991-12-31 1999-01-26 Stephen R. Huszar Egalisation et decodage pour canal de communication numerique
US5319677A (en) * 1992-05-12 1994-06-07 Hughes Aircraft Company Diversity combiner with MLSE for digital cellular radio
US5577068A (en) * 1992-06-08 1996-11-19 Ericsson Ge Mobile Communications Inc. Generalized direct update viterbi equalizer
US5621769A (en) * 1992-06-08 1997-04-15 Novatel Communications Ltd. Adaptive-sequence-estimation apparatus employing diversity combining/selection
SE470371B (sv) * 1992-06-23 1994-01-31 Ericsson Telefon Ab L M Sätt och anordning vid digital signalöverföring att hos en mottagare estimera överförda symboler
DE4224214C2 (de) * 1992-07-22 1995-02-09 Deutsche Forsch Luft Raumfahrt Verfahren zur quellengesteuerten Kanaldecodierung durch Erweiterung des Viterbi-Algorithmus
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
US5465412A (en) * 1993-05-19 1995-11-07 Motorola, Inc. Apparatus and method for determining a point in time for detecting a sampled signal in a receiver
SG43121A1 (en) * 1993-10-14 1997-10-17 Ericsson Ge Mobile Inc Adaptive bandwidth receiver
US5668837A (en) * 1993-10-14 1997-09-16 Ericsson Inc. Dual-mode radio receiver for receiving narrowband and wideband signals
US5563918A (en) * 1993-12-17 1996-10-08 Rockwell International Method of selecting optimum frequency in skywave communication apparatus
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
US6201801B1 (en) 1994-03-24 2001-03-13 Ericsson Inc. Polarization diversity phased array cellular base station and associated methods
US5499272A (en) * 1994-05-31 1996-03-12 Ericsson Ge Mobile Communications Inc. Diversity receiver for signals with multipath time dispersion
US6081566A (en) * 1994-08-02 2000-06-27 Ericsson, Inc. Method and apparatus for interference rejection with different beams, polarizations, and phase references
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
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
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
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
US5889827A (en) 1996-12-12 1999-03-30 Ericsson Inc. Method and apparatus for digital symbol detection using medium response estimates
US6067295A (en) * 1997-01-13 2000-05-23 Lucent Technologies, Inc. Method and apparatus for reducing error in recovering information bits in a wireless system
US5933421A (en) * 1997-02-06 1999-08-03 At&T Wireless Services Inc. Method for frequency division duplex communications
US6108517A (en) * 1997-07-28 2000-08-22 Ericsson Inc. Methods and apparatus for joint demodulation of adjacent channel signals in digital communications systems
US5907582A (en) * 1997-08-11 1999-05-25 Orbital Sciences Corporation System for turbo-coded satellite digital audio broadcasting
US6470192B1 (en) 1999-08-16 2002-10-22 Telefonaktiebolaget Lm Ericcson (Publ) Method of an apparatus for beam reduction and combining in a radio communications system
US6487259B1 (en) 1999-08-24 2002-11-26 Motorola, Inc. Partially-parrallel trellis decoder apparatus and method
EP1152576B8 (fr) * 2000-05-05 2009-12-23 Agere Systems, Inc. Estimation conjointe par l'utilisation des algorithmes M ou T, dans des systèmes à plusieurs antennes
US7515659B2 (en) 2001-05-04 2009-04-07 Agere Systems Inc. Decoding techniques for multi-antenna systems
US6847690B1 (en) 2000-11-22 2005-01-25 Telefonaktiebolaget Lm Ericsson (Publ) Determinant-based synchronization techniques and systems
US6771705B2 (en) * 2001-02-01 2004-08-03 Nokia Corporation Turbo encoder with transmitter diversity
US7149258B2 (en) * 2001-11-28 2006-12-12 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for estimation of phase offset between communication channels
US7346126B2 (en) * 2001-11-28 2008-03-18 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for channel estimation using plural channels
US8116259B2 (en) * 2006-09-29 2012-02-14 Broadcom Corporation Method and system for diversity processing based on antenna switching
US7689188B2 (en) * 2006-09-29 2010-03-30 Broadcom Corporation Method and system for dynamically tuning and calibrating an antenna using antenna hopping
US8346091B2 (en) 2009-04-29 2013-01-01 Andrew Llc Distributed antenna system for wireless network systems
CN104782093B (zh) 2012-10-31 2018-02-27 康普技术有限责任公司 远程通信分配系统中的数字基带传输
EP2979410B1 (fr) * 2013-03-28 2018-04-25 Nokia Solutions and Networks Oy Estimation de canal dans les communications mobiles avec beamforming

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3633107A (en) * 1970-06-04 1972-01-04 Bell Telephone Labor Inc Adaptive signal processor for diversity radio receivers
US4283788A (en) * 1976-06-25 1981-08-11 Cselt - Centro Studi E Laboratori Telecomunicazioni S.P.A. Equalization system with preshaping filter
US4847871A (en) * 1987-01-28 1989-07-11 Matsushita Electric Industrial Co., Ltd. Viterbi detector for digital signal
US4733402A (en) * 1987-04-23 1988-03-22 Signatron, Inc. Adaptive filter equalizer systems
NO163120C (no) * 1987-05-19 1990-04-04 Sintef Fremgangsmaate ved demodulasjon i digitale kommunikasjonssystemer med flerbane-propagasjon.
US4881241A (en) * 1988-02-24 1989-11-14 Centre National D'etudes Des Telecommunications Method and installation for digital communication, particularly between and toward moving vehicles
GB2215567B (en) * 1988-03-05 1992-11-18 Plessey Co Plc Improvements in or relating to equalisers
US5031193A (en) * 1989-11-13 1991-07-09 Motorola, Inc. Method and apparatus for diversity reception of time-dispersed signals

Also Published As

Publication number Publication date
AU634629B2 (en) 1993-02-25
AU7107491A (en) 1991-08-22
ES2064981T3 (es) 1995-02-01
JP3113293B2 (ja) 2000-11-27
KR960013962B1 (ko) 1996-10-10
CN1025400C (zh) 1994-07-06
SE9000566D0 (sv) 1990-02-16
ATE114906T1 (de) 1994-12-15
EP0443997B1 (fr) 1994-11-30
DE69105298D1 (de) 1995-01-12
NZ236924A (en) 1993-03-26
SE9000566L (sv) 1991-08-17
CN1054156A (zh) 1991-08-28
CA2036423C (fr) 1996-12-17
MY104741A (en) 1994-05-31
JPH04215334A (ja) 1992-08-06
SE465597B (sv) 1991-09-30
KR910016163A (ko) 1991-09-30
EP0443997A1 (fr) 1991-08-28
DK0443997T3 (da) 1995-05-08
CA2036423A1 (fr) 1991-08-17
DE69105298T2 (de) 1995-04-13
US5191598A (en) 1993-03-02

Similar Documents

Publication Publication Date Title
EP0443997B1 (fr) Méthode pour réduire la cause du fading dans un récepteur Viterbi ayant au moins deux antennes
US5481572A (en) Method of and apparatus for reducing the complexitiy of a diversity combining and sequence estimation receiver
US5164961A (en) Method and apparatus for adapting a viterbi algorithm to a channel having varying transmission properties
US5465276A (en) Method of forming a channel estimate for a time-varying radio channel
US5353307A (en) Automatic simulcast alignment
AU638785B2 (en) Diversity reception of time-dispersed signals
CA2083304C (fr) Egalisation et decodage pour canal de communication numerique
US5202903A (en) Noise-immune space diversity receiver
EP0715440B1 (fr) Detecteur synchrone et procede de synchronisation pour un recepteur numerique de telecommunications
JP2556179B2 (ja) ダイバーシティ受信方式
US5727032A (en) Method and device for estimating transmitted signals in a receiver in digital signal transmission operations
CA2097152C (fr) Dispositif adaptatif d'evaluation de sequences a combinaison-selection en diversite
US6246732B1 (en) Demodulator including adaptive equalizer and demodulating method in digital communications
EP3264701B1 (fr) Démodulateurs de modulation par déplacement de fréquence (fsk)
US5029186A (en) Method of demodulation in digital communication systems with multipath propagation
US6952570B2 (en) Wireless communication receiver that determines frequency offset
US6205170B1 (en) Transmission/reception unit with bidirectional equalization
EP0453814B1 (fr) Système adaptatif d'estimation de réponses impulsionnelles de canal au moyen d'estimation de séquence ayant un maximum de vraisemblance
US5313495A (en) Demodulator for symbols transmitted over a cellular channel
US5027371A (en) Self-adaptive equalizer circuit for a differentially coherent demodulation installation
US7274715B2 (en) Method and apparatus for automatic delay compensation in space diversity radio transmissions
JPH10336083A (ja) アダプティブアレイ受信機
JPH0372725A (ja) ダイバーシティ受信装置
JPH06177928A (ja) 検波器
JPH10178373A (ja) 干渉キャンセラ

Legal Events

Date Code Title Description
PF Patent in force
PE Patent expired

Effective date: 20110128