A Simplified-AEV Stopping Criterion for BICM-ID System

Abstract

Bit-interleaved coded modulation (BICM) is a remarkable scheme through maximizing the code diversity to achieve better reliability over Rayleigh fading channel. However, it causes performance degradation in AWGN channel because of the reducing of the free (squared) Euclidean distance. Thus, the iterative decoding algorithm in BICM system (BICM-ID) is proposed, which can get unexceptionable BER performance both in AWGN channels and in Rayleigh fading channels. However, the iteration process increases the complexity at the receiver and leads to much decoding delay. Thus, the stopping criterions, which can timely stop the unnecessary iterations, are put forward. In this paper, we propose a Simplified-AEV stopping criterion based on the conventional AEV scheme. Simulation results have shown that the Simplified-AEV scheme can take a better trade off between the average iteration numbers and the performance degradation than the other existing stopping criterions, which makes it a more optional choice for BICM-ID system.