On the performance of bit-interleaved coded DAPSK over Rayleigh fading channels

We analyze the achievable performance of the coded differential amplitude and phase shift keying (DAPSK) over a frequency non-selective Rayleigh fading channel with ideal bit interleaving. The bit metrics based on the exact probability density of detector output and the average mutual information of the system with conventional differential detection are derived and compared with that of multiple-symbol differential detection (MSDD). It is shown that by suitably incorporating the amplitude statistics of transmitted signals into bit metrics, the performance of conventional DAPSK can be significantly improved without increasing complexity. Theoretical framework developed above is also justified by the comparative simulation results using convolutional and turbo codes.