Abstract
Rate-1/2 180° phase-invariant convolutional coding and unquantised maximum-likelihood Viterbi decoding with differentially-encoded coherent QPSK (DE-QPSK) for bandlimited additive white Gaussian noise (AWGN) channels are considered. The simulated bit error probability performance of the trellis-coded modulation is presented for four- and eight-state convolutional codes of constraint lengths three and four, respectively.
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