A Novel BICM-ID System Approaching Shannon-Limit at High Spectrum Efficiency

Abstract

A method to construct bit-interleaved coded modulation with iterative demapping and decoding (BICM-ID) is developed that approaches the Shannon limit very closely at high spectrum efficiency, where amplitude-phase shift keying (APSK) constellations are designed and chosen. For 1/2-rate 64APSK, the E_s/N₀ threshold derived through extrinsic information transfer (EXIT) charts is less than 0.55dB away from the Shannon limit of the continuous-input additive white Gaussian noise (AWGN) channel, and exceeds the theoretical limit constrained by standard 64QAM-input.