Research And Simulation Of LDPC Encoding And Decoding Technology

Channel coding technology can improve the reliability of communication system,this paper mainly to the current best performance of error correction coding technology-and conduct the thorough research to the LDPC code.Value of different LDPC codes based on the sparse check matrix elements can be divided into binary LDPC code and LDPC code.Firstly,to check matrix structure of binary LDPC codes and decoding algorithm theory research.Using BPSK modulation way,under white gaussian noise channel to establish binary LDPC-BPSK code modulation system,and simulation analysis was carried out on the factors affecting the performance of LDPC codes,to determine the optimum parameters of the system.Secondly,analyzed the CPM modulation technology,and established the binary LDPC encoding technology and CPM modulation technology of cascade system,to binary LDPC-CPM system simulation,the results and the binary LDPC-BPSK system performance comparison.Finally,the principle of multivariate LDPC codes,on the basis of theoretical analysis,studies the different construction method of multivariate calibration matrix of LDPC codes,decoding algorithm,and the multiple LDPC-BPSK compiled code modulation system for simulation analysis.A multi-LDPC-CPM compiled code modulation system was established and simulated.