Abstract

A new simplified trellis decoder (STD) Viterbi-type algorithm is proposed for fast trellis decoding of rate K/K+1 binary convolutional codes. Viterbi algorithm (VA) computation is dominated by add-compare-select (ACS) operations when k/spl ges/2. The STD can substantially reduce the number of ACS operations and allow for a trade-off between the computational load and the performance of the decoder, The STD is analyzed and simulated for a four-dimensional (4-D) rate 4/5 64-state convolutional encoder specified by the ITU-T V.34 modem recommendation.

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