Joint source channel coding over frequency selective fading channels with feedback using OFDM

Venceslav Kafedziski, Darryl Morrell

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

In this paper we investigate joint source-channel coding for frequency selective fading channels with feedback. We use multicarrier modulation (also called OFDM -orthogonal frequency division multiplexing) as modulation procedure to reduce the effects of ISI. We model the time variation of a stationary and ergodic frequency selective fading channel as a finite state Markov chain and we perform optimal power allocation for channel states and subchannels. In the case when the number of sub carriers is small, equalization is required; we use a recursive block MAP receiver that provides soft decisions and accounts for the residual redundancy at the vector quantizer output. This decoder is used in conjunction with a channel optimized vector quantization (COVQ) or channel matched tree structured vector quantization (CM-TSVQ) in which the VQ design is performed with respect to channel error matrices computed by simulation. When using TSVQ, the indices of the first stages of the TSVQ are transmitted on the subchannels with higher power. Results are presented for codebooks designed by using COVQ and CM-TSVQ for a Markov source; we consider a two subchannel case with equalization, and a fading channel with two equiprobable states and flat fading.

Original languageEnglish (US)
Title of host publicationIEEE Vehicular Technology Conference
Editors Anon
PublisherIEEE
Pages1390-1394
Number of pages5
Volume3
StatePublished - 1997
EventProceedings of the 1997 47th IEEE Vehicular Technology Conference. Part 1 (of 3) - Phoenix, AZ, USA
Duration: May 4 1997May 7 1997

Other

OtherProceedings of the 1997 47th IEEE Vehicular Technology Conference. Part 1 (of 3)
CityPhoenix, AZ, USA
Period5/4/975/7/97

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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