Implementation issues in MAP joint source/channel coding

Khalid Sayood, Jerry D. Gibson, Fuling Liu

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

A MAP (maximum a posteriori) approach to joint source/channel coding has been proposed which uses a MAP decoder and a modification of the souce coder to provide error correction. The authors present various implementation strategies for this approach and provide results for an image coding application. It is shown that, while the previously proposed approach achieves the objective of increasing the error-correcting capability, it also results in a variable-rate system. For this situation the previously proposed branch metric becomes difficult to implement. The authors explain these difficulties and propose implementable approximations of the metrics in the next section. Simulation results are given which demonstrate the viability of these approximations. The use of a variable-rate coder also complicates the structure of the decoder. The authors present a modified Viterbi decoder which can be used with variable-rate codes.

Original languageEnglish (US)
Pages (from-to)102-106
Number of pages5
JournalConference Record - Asilomar Conference on Circuits, Systems & Computers
Volume1
StatePublished - Dec 1 1988
Eventv 1 (of 2) - Pacific Grove, CA, USA
Duration: Oct 31 1988Nov 2 1988

Fingerprint

Channel coding
Error correction
Image coding

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Implementation issues in MAP joint source/channel coding. / Sayood, Khalid; Gibson, Jerry D.; Liu, Fuling.

In: Conference Record - Asilomar Conference on Circuits, Systems & Computers, Vol. 1, 01.12.1988, p. 102-106.

Research output: Contribution to journalConference article

@article{657632794e7c410aaf1da337dd77dc44,
title = "Implementation issues in MAP joint source/channel coding",
abstract = "A MAP (maximum a posteriori) approach to joint source/channel coding has been proposed which uses a MAP decoder and a modification of the souce coder to provide error correction. The authors present various implementation strategies for this approach and provide results for an image coding application. It is shown that, while the previously proposed approach achieves the objective of increasing the error-correcting capability, it also results in a variable-rate system. For this situation the previously proposed branch metric becomes difficult to implement. The authors explain these difficulties and propose implementable approximations of the metrics in the next section. Simulation results are given which demonstrate the viability of these approximations. The use of a variable-rate coder also complicates the structure of the decoder. The authors present a modified Viterbi decoder which can be used with variable-rate codes.",
author = "Khalid Sayood and Gibson, {Jerry D.} and Fuling Liu",
year = "1988",
month = "12",
day = "1",
language = "English (US)",
volume = "1",
pages = "102--106",
journal = "Conference Record - Asilomar Conference on Circuits, Systems & Computers",
issn = "0736-5861",

}

TY - JOUR

T1 - Implementation issues in MAP joint source/channel coding

AU - Sayood, Khalid

AU - Gibson, Jerry D.

AU - Liu, Fuling

PY - 1988/12/1

Y1 - 1988/12/1

N2 - A MAP (maximum a posteriori) approach to joint source/channel coding has been proposed which uses a MAP decoder and a modification of the souce coder to provide error correction. The authors present various implementation strategies for this approach and provide results for an image coding application. It is shown that, while the previously proposed approach achieves the objective of increasing the error-correcting capability, it also results in a variable-rate system. For this situation the previously proposed branch metric becomes difficult to implement. The authors explain these difficulties and propose implementable approximations of the metrics in the next section. Simulation results are given which demonstrate the viability of these approximations. The use of a variable-rate coder also complicates the structure of the decoder. The authors present a modified Viterbi decoder which can be used with variable-rate codes.

AB - A MAP (maximum a posteriori) approach to joint source/channel coding has been proposed which uses a MAP decoder and a modification of the souce coder to provide error correction. The authors present various implementation strategies for this approach and provide results for an image coding application. It is shown that, while the previously proposed approach achieves the objective of increasing the error-correcting capability, it also results in a variable-rate system. For this situation the previously proposed branch metric becomes difficult to implement. The authors explain these difficulties and propose implementable approximations of the metrics in the next section. Simulation results are given which demonstrate the viability of these approximations. The use of a variable-rate coder also complicates the structure of the decoder. The authors present a modified Viterbi decoder which can be used with variable-rate codes.

UR - http://www.scopus.com/inward/record.url?scp=0024179658&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0024179658&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0024179658

VL - 1

SP - 102

EP - 106

JO - Conference Record - Asilomar Conference on Circuits, Systems & Computers

JF - Conference Record - Asilomar Conference on Circuits, Systems & Computers

SN - 0736-5861

ER -