Optimized low-density parity-check (LDPC) codes for bandwidth efficient modulation

In this paper, we implement an efficient MLC/PDL system for AWGN channels. In terms of the tradeoff between hardware implementation and system performance, proposed LDPC code is optimized by Gaussian approximation (GA) according to the rate of each level assigned by the capacity rule and chosen as the component code. System performance with Ungerboeck Partitioning (UP), Mixed Partitioning (MP) and Gray Mapping (GM) of 8PSK are evaluated, respectively. Many results are presented in this paper; they indicate that the proposed MLC/PDL system based on the optimized LDPC code, capacity rule and Gray Mapping (GM) can bring the very good performance.