Trellis coded modulation applied to orthogonal signals.
Stevens, Janet Emerson
Ha, Tri T.
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A method for the design of trellis codes for coherent detection of orthogonal signals in additive white Gaussian noise (AWGN) channels is presented. This method utilizes the landmark works of Ungerboeck in trellis coded modulation (TCM) . After examining the channel capacity, it is shown that a coding method requiring the same bandwidth efficiency for the orthogonal signal space and maximum likelihood (ML) soft decoding using the Viterbi algorithm can achieve large asymptotic coding gains. Several codes are analyzed using Ungerboeck' s technique of set-partitioning and mapping, then applying the analytic code description method of Calderbank and Mazo to M-ary frequency shift keying (M-FSK) . The general finding of this paper is that relative to uncoded modulation, asymptotic coding gains of 3-4 dB can be achieved.
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