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

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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
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HK
Hong Kong
Prior art keywords
viterbi
signals
metric values
antennas
state
Prior art date
Application number
HK34495A
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English (en)
French (fr)
Inventor
Tomas Olof Baeckstroem
Ragnar Erik Kahre
Jan-Erik Stoernvall
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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.)
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Publication date
Application filed by Telefonaktiebolaget L M Ericsson filed Critical Telefonaktiebolaget L M Ericsson
Publication of HK34495A publication Critical patent/HK34495A/en

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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)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Probability & Statistics with Applications (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (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. Verfahren zur Verminderung des Fadingeinflusses auf einen Viterbi-Empfänger mit mindestens zwei Antennen, wobei der Empfänger Funksignale über einen Kanal empfängt, der Störungen unterworfen ist und das Verfahren die Schritte aufweist:
    - Empfangen des Signals an den Antennen die wechselseitig beabstandet sind,
    - Abtasten von den Antennen empfangener Signale in empfangene Antennensignale,
    - Bilden einer Kanalabschätzung, einer Abschätzung der Kanalübertragungsfunktion, und    Verarbeiten des Signals in dem Entzerrer des Viterbi-Empfängers nach dem Viterbi-Algorithmus, wobei Symbole für die Zustandsübergänge des Viterbi-Algorithmus angenommen werden,    dadurch gekennzeichnet, daß die Kanalabschätzung mindestens zwei (R) zu individuellen Antennen (4) zugehörige Teil-Kanalabschätzungen (hest,r) einschließt, wobei das Verfahren zu einem angegebenen Abtastzeitpunkt (k) die weiteren Schritte einschließt:
    - Bilden angenommener Eingangssignale (sa,r(ΔTij,k)) aus den angenommen Symbolen (s(ΔTij)) mit Hilfe der Teil-Kanalabschätzungen (hest,r), wobei ein angenommenes Eingangssignal (sa,r(ΔTij,k)) für die individuellen Teil-Kanalabschätzungen (hest,r) für jeden Zustandsübergang (ΔTij) des Viterbi-Algorithmus gebildet wird,
    - Bilden teilmetrischer Werte (mr(ΔTij,k)) für die individuellen Kanalabschätzungen (hest,r) in Abhängigkeit von dem empfangenen Antennensignal Sin,r(k), welches zu der Teil-Kanalabschätzung und den entsprechenden angenommenen Eingangssignalen (sa,r(ΔTij,k)) gehört,
    - Bilden eines metrischen Wertes (M((ΔTij,k)) für einen angegebenen Zustandsübergang (ΔTij) zwischen einem alten (Tj) und einem neuen (Ti) Zustand im Viterbi-Algorithmus, wie beispielsweise eines metrischen Wertes (M((ΔTj,k-1)), der gemäß dem Viterbi-Algorithmus für den alten Zustand (Tj) zu einem Abtastzeitpunkt (k-1), der dem angegebenen Abtastzeitpunkt (k) vorhergeht, gewählt wurde, der mit einer gewichteten (Kr) Summe der teilmetrischen Werte (mr(ΔTij,k)), welche zu den individuellen Teil-Kanalabschätzungen (hest,r) gehören, vergrößert ist, und
    - Bilden metrischer Werte, welche dem metrischen Wert (M(ΔTj,k)) für den angegebenen Zustandsübergang (ΔTij) entsprechen, für alle Zustandsübergänge (ΔTij) auf den neuen Zustand (Ti) und Auswählen des kleinsten Wertes (M(Tj,k)) dieser metrischen Werte (M(ΔTj,k)) am Übergang zu dem neuen Zustand (Ti) nach dem Viterbi-Algorithmus.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die individuellen teilmetrischen Werte (mr(ΔTij,k)) in Abhängigkeit von einem absoluten Wert der Differenz zwischen dem empfangenen Antennensignal (sin,r(k)) und den entsprechenden angenommenen Eingangssignalen (sa,r(ΔTij,k)) gebildet werden.
  3. Verfahren nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß alle Koeffizienten (Kr) für die Wichtung der teilmetrischen Werte (mr(ΔTij,k)) wechselseitig dieselben Werte (Kr = P/R) aufweisen.
  4. Verfahren nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß die Koeffizienten (Kr) für die Wichtung der teilmetrischen Werte (mr(ΔTij,k)) in Abhängigkeit von der Amplitude des entsprechenden empfangenen Antennensignals Sin,r(k) gewählt werden.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Koeffizienten (Kr) für die Wichtung der teilmetrischen Werte (mr(ΔTij,k)) proportional (c) zu der Energie des empfangenen Antennensignals sin,r(k) sind.
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

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

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Also Published As

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

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