Iterative decoding for coded noncoherent MPSK communications over phase-noisy AWGN channel

A family of interleaved systems for communicating over the additive white G aussian noise (AWGN) channel with noisy or unknown phase is investigated. E ach system comprises convolutional code or turbo code, interleaver, binary phase shift keying or quaternary phase shift keying modulation and differen tial or similar encoding. The receiver performs jointly and iteratively the decoding and the channel demodulation in the presence of unknown phase uti lising an observation interval exceeding two symbols. AU systems exhibit go od performance with various levels of phase noise. The convolutional code, achieving bit error rate (BER) below 10(-3) at bit energy over noise spectr al density ratio (E-b/N-o) of 2.4dB with no phase noise, outperforms the tu rbo code slightly over AWGN channels due to limited capability of the itera tive algorithm in this setting. The turbo code is superior in bursty channe ls, modelling for example a block erasures fading environment. When the car rier phase is unknown but constant over an interval of ten symbols, the tur bo coded system achieves BER lower than 10(-3) at E-b/N-o of 2.6dB, that is 1.3dB away from the capacity limit of this channel.