EXIT-Chart Based Labeling Design for Type-I HARQ in BICM-ID Systems

This paper investigates the issue of labeling design in the BICM-ID (bitinterleaved coded modulation-iterative decoding) systems with Type-I HARQ (hybrid auto-retransmission request). Based on the EXIT (extrinsic information transfer) chart, an algorithm is developed in search of good labelings that well match with the outer code. The concept of link adaptation is realized by using different labelings at different SINR (signal-to-noise ratio) to achieve a better performance. Numerical results show that the new design outperforms the existing ones. Keywords— BICM-ID, HARQ, Labelling Design, EXIT Chart