Noncoherent detection of factor graph codes over fading channels

In this paper we consider noncoher ent multi symbol detection of factor graph codes over Rayleigh fading channels We use block di erential encoding together with a joint demodulation and it erative decoding algorithm to eliminate the pilot over head required for coherent detection Simulations us ing turbo codes and repeat accumulate codes show that as the length of the coherence interval increases performance of the proposed noncoherent detector approaches that of the coherent detector