The simulation results and analysis indicate that such construction algorithm is of the advantages as follows: The performance of irregular QC-LDPC codes constructed by the proposed methods in the paper not only be better than the regular QC-LDPC codes by the direct construction algorithm,but also be closed to the random-like LDPC codes;They have lower error floors compare with the random-lik.

This paper presents a decoding method for regular QC-LDPC codes.

This paper designs a kind of circulant-shift permutation matrix called Q matrix,replacing identity matrix I as partitioned matrix,which fills in parity-check matrix H to form irregular QC-LDPC codes,based on the integration of 4G and WiMAX in technology.

Since the parity-check matrix of the QC-LDPC code is composed of blocks of circulant matrices,the required memory for storing it can be significantly reduced,compared with randomly constructed LDPC codes.

Moreover,when dimension of the extended matrix of the parity check matrix of a QC-LDPC code is a prime number,approaches fo.

Performance Analysis of LDPC Decoding Algorithm;

Study and Development of LDPC Coding;

Analysis of LDPC Decoding Algorithm Based on Serial Schedule;