Jointly iterative decoding of low-density parity check codes (ldpc) coded continues phase modulation (cpm)
Nan Zhang, Xiao Rong Gao, Yemao Xu · 2011
This paper investigates the performance of a Low-Density Parity Check codes (LDPC)-coded system transmitted over A WGN channels using octal partial response Continuous Phase Modulation (CPM). The system provides an attractive option for spectral efficient communications systems. The CPM modulator can be decomposed into a ring continuous-phase encoder (CPE) followed by a memoryless modulator (MM), where the CPE is as the same algebra as convolutional code. With a pragmatic approach, The LDPC codes are designed through the use of the proposed analysis technique based on extrinsic information transfer (EXIT) charts. We propose a belief propagation (BP)-based iterative decoding algorithm at the receiver. The hybrid design combined with iterative decoding yield very good performances compare with the conventional communication schemes. The results show the considerable superiority of the iterative algorithm.