Improvement of Encoding Algorithm Based on Rate Variable Code Modulation RCM

This paper proposed a higher rate adaptive coding method, LDPC-RCM, which is based on the rate variable modulation RCM. The encoding matrix is different from the structure of the encoding matrix in RCM, but rather similar to the construction of the binary LDPC code parity check matrix. It replaces the non-zero elements in the parity check matrix with the weight set elements of the arithmetic field. This approach can effectively reduce the number of short loop in the corresponding bipartite graph, accelerate the process of BP decoding, and increase the transmission rate. In LDPC-RCM, the weight set of the arithmetic domain ensures the rate adaptive transmission characteristics of RCM, the positions of non-zero elements retain the high rate characteristic of LDPC.