Simple iterative decoding for bit-interleaved coded orthogonal modulation

This paper considers bit-interleaved coded modulation with iterative decoding (BICM-ID) using M-ary orthogonal signaling. Simplified algorithms for hard-decision feedback iterative decoding for coherent and noncoherent M-FSK are studied, resulting in low complexity implementation. A performance comparison between BICM-ID systems employing M-FSK modulation in AWGN and Rayleigh flat fading channels is presented, using the proposed iterative decoder