MISMATCHED DECODING OF INTERSYMBOL INTERFERENCE USING A PARALLEL CONCATENATED SCHEME

A turbo-type scheme that uses parallel concatenation and soft-output i terative detection is proposed for transmission over linear intersymbo l interference channels, When the receiver has perfect knowledge of th e channel, the scheme offers only marginal improvement in performance over optimum linear coded modulation with Viterbi or reduced search de tection, However, the improvement is significantly higher when the det ector is mismatched, i.e., if it uses an imperfect channel estimate, T he delay is low since the block sizes are small, and the performance i mprovement is achieved with few iterations, The technique may be appli ed as a retransmission strategy in order to save power for systems tha t suffer from losses due to ISI and channel mismatch.