SE9002664D0 - SETTING AND DEVICING IN A RADIO SYSTEM TO DETERMINE A RECEIVED INFORMATION-BEING DATA SEQUENCE - Google Patents

SETTING AND DEVICING IN A RADIO SYSTEM TO DETERMINE A RECEIVED INFORMATION-BEING DATA SEQUENCE

Info

Publication number
SE9002664D0
SE9002664D0 SE9002664A SE9002664A SE9002664D0 SE 9002664 D0 SE9002664 D0 SE 9002664D0 SE 9002664 A SE9002664 A SE 9002664A SE 9002664 A SE9002664 A SE 9002664A SE 9002664 D0 SE9002664 D0 SE 9002664D0
Authority
SE
Sweden
Prior art keywords
signal
sequence
vcircumflex
sequences
transmitter
Prior art date
Application number
SE9002664A
Other languages
Swedish (sv)
Other versions
SE9002664L (en
SE466828B (en
Inventor
Dent P Wilkinson
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
Priority to SE9002664A priority Critical patent/SE466828B/en
Publication of SE9002664D0 publication Critical patent/SE9002664D0/en
Publication of SE9002664L publication Critical patent/SE9002664L/en
Publication of SE466828B publication Critical patent/SE466828B/en

Links

Classifications

    • 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
    • H03M13/4138—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors soft-output Viterbi algorithm based decoding, i.e. Viterbi decoding with weighted decisions
    • H03M13/4146—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors soft-output Viterbi algorithm based decoding, i.e. Viterbi decoding with weighted decisions soft-output Viterbi decoding according to Battail and Hagenauer in which the soft-output is determined using path metric differences along the maximum-likelihood path, i.e. "SOVA" decoding
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/02—Delta modulation, i.e. one-bit differential modulation

Abstract

A received radio signal S has been coded differentially in a transmitter and transmitted over a radio channel with multi-wave propagation and random phase displacement. The radio signal is sampled A/D and a signal sequence R(i) so obtained is decoded differentially to an observed signal sequence V(i) = R(i).R(i-1)* by delay and complex conjugation 10 and multiplication 11. By correlation 12 with a known synchronization sequence the delay coefficients C0, C1 of the radio channel are estimated. A Viterbi analyser 15 sets trial sequences D(i) of symbols and using the delay coefficients C0, C1 predicted signal sequences Vcircumflex(i) are generated depending upon the differential coding procedure of the transmitter. Error signals deltaM are generated between the observed signal sequences V(i) and the predicted signal sequences Vcircumflex(i). The Viterbi analyser 15 accumulates the error signals deltaM and selects the one of the predicted signal sequences Vcircumflex(i) which has the lowest accumulated error signal. The corresponding assumed trial sequence D(i)1 is most probably the data sequence the transmitter generated before the differential coding. <IMAGE>
SE9002664A 1990-08-15 1990-08-15 Method and device for determining a received information- carrying data sequence in a radio system SE466828B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9002664A SE466828B (en) 1990-08-15 1990-08-15 Method and device for determining a received information- carrying data sequence in a radio system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9002664A SE466828B (en) 1990-08-15 1990-08-15 Method and device for determining a received information- carrying data sequence in a radio system

Publications (3)

Publication Number Publication Date
SE9002664D0 true SE9002664D0 (en) 1990-08-15
SE9002664L SE9002664L (en) 1992-02-16
SE466828B SE466828B (en) 1992-04-06

Family

ID=20380164

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9002664A SE466828B (en) 1990-08-15 1990-08-15 Method and device for determining a received information- carrying data sequence in a radio system

Country Status (1)

Country Link
SE (1) SE466828B (en)

Also Published As

Publication number Publication date
SE9002664L (en) 1992-02-16
SE466828B (en) 1992-04-06

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