Iterative decision-feedback differential demodulation of bit-interleaved coded MDPSK for flat Rayleigh fading channels

| A simple receiver structure recently proposed by the authors [1] for convolutional coded M{ary di erential phase shift keying (MDPSK) transmission over at Rayleigh fading channels without channel state information is analyzed in detail. We present a thorough discussion of the iterative decoding procedure, which is referred to as iterative decision{feedback di erential demodulation (iterative DF{DM) [1]. The convergence behavior of iterative DF{DM is theoretically examined. The analysis supports the observation that the iterative decoding scheme works well for target bit error rates which are usually of interest. Furthermore, the associated cuto rate for error{free decision feedback is studied. Judging from this performance parameter remarkable gains in power efciency compared to conventional di erential demodulation are indicated, while the computational complexity of the decoding remains low. The results from information theory are in good agreement with the given simulation results.