The encoding, decoding, and the construction methods of generator matrix of LDPC codes with reduced complexity have matured, and the theoretical analysis, approximation methods, optimization work of LDPC codes have finished in single user AWGN Channel. The results obtained by the methods used in single user AWGN channel are not ideal in AWGN multiple access channel. The paper is focused on the optimization of LDPC codes in multiple access channel, it includes the following:
1、Enhancing the performance o...