Abstract-This paper presents a performance analysis of bitinterleaved coded-modulation with iterative decoding (BICM-ID) and complex N -dimensional signal space diversity in fading channels to investigate its performance limitation, the choice of the rotation matrix and the design of a low-complexity receiver. The tight error bound is first analytically derived. Based on the design criterion obtained from the error bound, the optimality of the rotation matrix is then established. It is shown that using the class of the optimal rotation matrices, the performance of BICM-ID systems over a Rayleigh fading channel approaches that of the BICM-ID systems over an AWGN channel when the dimension of the signal constellation increases. Furthermore, by exploiting the sigma mapping for any M -ary QAM constellation, a very simple sub-optimal, but yet effective iterative receiver structure suitable for signal constellations with large dimensions is proposed. Simulation results in various cases and conditions indicate that the proposed receiver can achieve the analytical performance bounds with low complexity. Index Terms-Bit-interleaved coded modulation, iterative decoding, signal space diversity, performance analysis, rotation matrix, minimum mean-square error estimation.
Complex multi-dimensional rotations have been used in REF to increase the performance of BICM-ID systems for Rayleigh fading channels.
Performance of BICM-ID with Signal Space Diversity
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Computer Science