MX9404754A - Metodo y dispositivo para estimar las señales transmitidas en un receptoren operaciones de transmision de señales digitales. - Google Patents

Metodo y dispositivo para estimar las señales transmitidas en un receptoren operaciones de transmision de señales digitales.

Info

Publication number
MX9404754A
MX9404754A MX9404754A MX9404754A MX9404754A MX 9404754 A MX9404754 A MX 9404754A MX 9404754 A MX9404754 A MX 9404754A MX 9404754 A MX9404754 A MX 9404754A MX 9404754 A MX9404754 A MX 9404754A
Authority
MX
Mexico
Prior art keywords
signal
symbols
filter
channel
estimate
Prior art date
Application number
MX9404754A
Other languages
English (en)
Inventor
Karim Jamal
Bjorn Gudmundson
Gustav Brismark
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of MX9404754A publication Critical patent/MX9404754A/es

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • 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
    • 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
    • H04L25/03248—Arrangements for operating in conjunction with other apparatus
    • H04L25/03254—Operation with other circuitry for removing intersymbol interference
    • H04L25/03261—Operation with other circuitry for removing intersymbol interference with impulse-response shortening filters
    • 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
    • H04L25/0212—Channel estimation of impulse response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/042—Detectors therefor, e.g. correlators, state machines

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Error Detection And Correction (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Noise Elimination (AREA)

Abstract

En un sistema de transmisión de señales digitales, un receptor (14) recibeuna señal (R(T)), donde lo ancho de banda del sistema rebasa la frecuenciade símbolos del sistema. Un circuito de muestreo y correlación (15) recibeuna señal de banda de base (y (T)), muestrea (21) la señal ocho veces (y(K/8)) por tiempo de símbolo (TS), correlaciona (23), genera unaestimación de canal (¬HF) y reduce la señal muestreada (y (K/8)) paraformar una señal observada (y (K/2)). Esta señal se filtra en un prefiltro(26), cuya salida se muestrea a la frecuencia de símbolo (27, TS/1) y laseñal obtenida (z (k)) se suministra a un igualador de canal (17) queefectúa un algoritmo viterbi con una calculación métrica no cuadrática ygenera símbolos estimados (¬SD (K)). Un filtro de estimación de canal(31) recibe una secuencia de símbolos que contiene símbolos alternos convalor cero (omega) y los símbolos estimados (¬SD (K)) y genera una señalestimada (¬y (k/2)). una señal de error (e(k/2)=y(k/2)-¬y(k/2)) se generay se emplea para adaptar (34) la estimación de canal (¬H(K/2)) y tambiénpara generar (35) factores ponderales (alfa (k/2)). Los coeficientes(¬G(K/2)) del prefiltro (26) se generan en función de la estimación decanal (¬H(k/2)) y de los factores de peso (alfa(k/2)). Los coeficientes segeneran en un filtro de cálculo métrico (39, ¬W(k)) mediante laconvulación de la estimación del canal (¬H(k/2)) con el prefiltro(¬G(k/2)) y se emplean para generar los símbolos estimados (¬SD(k)). Elcanal de transmisión, excluyendo el prefiltro (26), se estimaexplícitamente en la medida en que permite el seguimiento de cambiosrápidos de canal. El uso de los factores de peso (alfa(k/2)) permite elempleo de una estimación de canal corto. La insersión de los símbolos convalor cero (omega) simplifica la adaptación (34) de la estimación de canal(¬H(k/2)).
MX9404754A 1993-06-24 1994-06-23 Metodo y dispositivo para estimar las señales transmitidas en un receptoren operaciones de transmision de señales digitales. MX9404754A (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9302204A SE513657C2 (sv) 1993-06-24 1993-06-24 Sätt och anordning att vid digital signalöverföring estimera överförda symboler hos en mottagare

Publications (1)

Publication Number Publication Date
MX9404754A true MX9404754A (es) 1995-01-31

Family

ID=20390418

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9404754A MX9404754A (es) 1993-06-24 1994-06-23 Metodo y dispositivo para estimar las señales transmitidas en un receptoren operaciones de transmision de señales digitales.

Country Status (8)

Country Link
US (2) US5533067A (es)
KR (1) KR950002303A (es)
CN (3) CN1041985C (es)
CA (2) CA2478539C (es)
MX (1) MX9404754A (es)
SE (1) SE513657C2 (es)
TW (1) TW260852B (es)
UY (1) UY23796A1 (es)

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Also Published As

Publication number Publication date
CN1041985C (zh) 1999-02-03
CA2478539A1 (en) 1994-12-25
CN1110029A (zh) 1995-10-11
CN1191351A (zh) 1998-08-26
SE9302204L (sv) 1994-12-25
UY23796A1 (es) 1994-07-22
US5727032A (en) 1998-03-10
CA2478539C (en) 2006-04-18
KR950002303A (ko) 1995-01-04
US5533067A (en) 1996-07-02
SE513657C2 (sv) 2000-10-16
CA2126604C (en) 2005-04-12
CN1191353A (zh) 1998-08-26
SE9302204D0 (sv) 1993-06-24
CA2126604A1 (en) 1994-12-25
TW260852B (es) 1995-10-21

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