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This paper proposes a new pre-computation approach based on the auxiliary trellis of the TCM decoder's ACSU (add compare select unit). The suggested method is based on pre-computation of path metrics and resource sharing of the ACSU unit. The Viterbi decoder itself is a power-consuming module of the communication system that comprises the TMU (transition metric unit) and ACSU (add compare select unit). By applying the suggested method, the authors would be able to achieve low dynamic power. The TCM decoder designed accordingly shows better SER/ BER results in comparison to the existing techniques. The 4D 8 PSK TCM encoder and decoder were implemented as per the design specifications given by consultative committee for space data system (CCSDS) for satellite applications. The simulations results are observed on 100 Mbps data for 8PSK modulation and the ¾ code rate of the TCM encoder. The results based on the new method show improved power-speed ratio with improved SER and BER.

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