| Complementarity in the direction of technological development makes the interaction of information between the next generation of 4G(4-Generation wireless telephone technology)and WiMAX(World Interoperability for Microwave Access)a trend.The most important technology in 4G is the channel coding technology,and the channel coding technology strives to chase the advanced.Under the IEEE 802.16 e standard,Low Density Parity Check(LDPC)and Turbo codes are very suitable codes.However,because it does not have advanced error correction itself,this paper adopts a relatively simple LDPC code in the decoding process of the 4G mobile communication channel on the uplink and downlink.Due to the limited error correction capability,4G communication is in the downlink LDPC codes and Turbo codes with lower decoding complexity are used on the road.This paper focuses on searching for the structural characteristics of LDPC codes,and carries out corresponding research on its check matrix.On the basis of the research,an improved method is proposed,which uses a cyclic shift matrix as a sub-matrix to create LDPC code.He introduced the principle and performance analysis of block turbo codes and the convolutional turbo code encoding and decoding recommended by the IEEE 802.16 e standard.This paper first introduces the structural characteristics,construction methods and unique attributes of the cyclic shift matrix,and then expands the related decoding algorithms and construction modes for LDPC codes.In the process of research,it was found that the ring would interfere with the simple LDPC code,so the PEG algorithm was adopted to construct a D matrix,and then the creation of the D matrix was combined with the Q matrix to construct a simple LDPC code as It check matrix;based on the IEEE 802.16 e standard,it focuses on the analysis and study of the relevant composition of the check matrix of the LDPC code,and creates a simple check matrix of the LDPC code through the Q matrix,which will greatly Increase the coding and decoding efficiency of LDPC codes.Turbo codes are used in the uplink coding of 4G mobile communication channel coding.The two methods of block turbo code and convolutional turbo code are used to compile and decode.The structure and coding efficiency of these two codes are analyzed by combining the simulation analysis method,and the block turbo code and convolutional turbo code are obtained in the uplink.The code of the road has good efficiency and performance. |
