Mismatched decoding of intersymbol interference using a parallel concatenated scheme

A turbo-type scheme that uses parallel concatenation and soft-output iterative detection is proposed for transmission over linear intersymbol interference channels. When the receiver has perfect knowledge of the channel, the scheme offers only marginal improvement in performance over optimum linear...

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Bibliographic Details
Published inIEEE journal on selected areas in communications Vol. 16; no. 2; pp. 255 - 259
Main Authors Balachandran, K., Anderson, J.B.
Format Journal Article
LanguageEnglish
Published IEEE 01.02.1998
Subjects
Additive white noise
Concatenated codes
Convolutional codes
Degradation
Detectors
Filters
Intersymbol interference
Iterative decoding
Phase estimation
Viterbi algorithm
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ISSN0733-8716
DOI10.1109/49.661113

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Summary:A turbo-type scheme that uses parallel concatenation and soft-output iterative detection is proposed for transmission over linear intersymbol interference channels. When the receiver has perfect knowledge of the channel, the scheme offers only marginal improvement in performance over optimum linear coded modulation with Viterbi or reduced search detection. However, the improvement is significantly higher when the detector is mismatched, i.e., if it uses an imperfect channel estimate. The delay is low since the block sizes are small, and the performance improvement is achieved with few iterations. The technique may be applied as a retransmission strategy in order to save power for systems that suffer from losses due to ISI and channel mismatch.
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ISSN:0733-8716
DOI:10.1109/49.661113