CA2162332A1 - Variable Transmission Bit Rate Discrimination Method and Apparatus - Google Patents

Variable Transmission Bit Rate Discrimination Method and Apparatus

Info

Publication number
CA2162332A1
CA2162332A1 CA2162332A CA2162332A CA2162332A1 CA 2162332 A1 CA2162332 A1 CA 2162332A1 CA 2162332 A CA2162332 A CA 2162332A CA 2162332 A CA2162332 A CA 2162332A CA 2162332 A1 CA2162332 A1 CA 2162332A1
Authority
CA
Canada
Prior art keywords
transmission
bit rate
data
transmission bit
mobile station
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
CA2162332A
Other languages
French (fr)
Other versions
CA2162332C (en
Inventor
Tetsuya Takaki
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Publication of CA2162332A1 publication Critical patent/CA2162332A1/en
Application granted granted Critical
Publication of CA2162332C publication Critical patent/CA2162332C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • 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
    • H04L25/0262—Arrangements for detecting the data rate of an incoming signal
    • 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
    • H03M13/3961—Arrangements of methods for branch or transition metric calculation
    • 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
    • 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
    • H03M13/65—Purpose and implementation aspects
    • H03M13/6502—Reduction of hardware complexity or efficient processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H04B7/264—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for data rate control
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0046—Code rate detection or code type detection
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
    • 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
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system

Abstract

The invention provides a variable bit rate discrimination method and apparatus wherein a transmission bit rate of data received by a mobile station in a mobile communication which employs a spectrum spreading method can be discriminated readily to realize reduction in time required for decoding processing and miniaturization in circuit scale. A
variable bit rate including four different transmission bit rates is used as a transmission rate of a traffic channel from a base station to a mobile station, and transmission data are encoded using convolutional encoder for error correction and transmitted.
In the mobile station, received data are decoded for the four individual transmission bit rates using Viterbi decoders, and the decoded received data are compared with coded data sequences generated from the convolution codes to obtain path metric values which are sum totals of errors of the received data. Then, one of the transmission bit rates which exhibits a lowest one of the path metric values is selected as a bit rate used for transmission of the transmission data.
Consequently, after Viterbi decoding, no further encoding is required.
CA 2162332 1994-11-14 1995-11-07 Variable transmission bit rate discrimination method and apparatus Expired - Fee Related CA2162332C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP304363/1994 1994-11-14
JP30436394A JP2605641B2 (en) 1994-11-14 1994-11-14 Variable bit rate determination method and device

Publications (2)

Publication Number Publication Date
CA2162332A1 true CA2162332A1 (en) 1996-05-15
CA2162332C CA2162332C (en) 1999-12-28

Family

ID=17932125

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2162332 Expired - Fee Related CA2162332C (en) 1994-11-14 1995-11-07 Variable transmission bit rate discrimination method and apparatus

Country Status (7)

Country Link
US (1) US5638408A (en)
EP (1) EP0712219B1 (en)
JP (1) JP2605641B2 (en)
KR (1) KR0171208B1 (en)
AU (1) AU689967B2 (en)
CA (1) CA2162332C (en)
DE (1) DE69535458T2 (en)

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Also Published As

Publication number Publication date
AU689967B2 (en) 1998-04-09
US5638408A (en) 1997-06-10
EP0712219A3 (en) 1998-01-28
KR960020039A (en) 1996-06-17
KR0171208B1 (en) 1999-03-30
CA2162332C (en) 1999-12-28
EP0712219B1 (en) 2007-04-11
JPH08139695A (en) 1996-05-31
DE69535458T2 (en) 2007-12-13
AU3774495A (en) 1996-05-23
DE69535458D1 (en) 2007-05-24
EP0712219A2 (en) 1996-05-15
JP2605641B2 (en) 1997-04-30

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Effective date: 20021107