The Simulation Of LDPC Code In The OFDM System

With the sharp increasement of the amount of mobile subscribers,the data communication and multimedia service has increased. It has been the target to achieve ubiquitous,high quality,high data transfer rate,low power comsumption wireless mobile multimedia transfer,which make the orthogonal frequency division multipelxing(OFDM) wireless communicate system technology based on channel coding researchers' hotpot.In OFDM system,error correcton coding is essential to ensure the effective and reliable transmission in channels of various types of data.Especially,with the development of wireless digital communication and the emergency of high speed,sudden business,it is becoming more and more necessary to study and make use of error correction coding technology,and comparing with the Turbo code,LDPC code has a more systemic optimization design method,more powerful error correction capability and a lower floor effect,at the same time, as iterative decoding algorithm of the LDPC codes is parallel algorithm,time delay is far less than the serial iterative decoding algorithm of the Turbo code.All of these provide a broad prospect for LDPC code application.This article has programmed and simulated the OFDM wireless communication system and low-density parity-check code using matlab software.The structure of OFDM system and the performance of LDPC code is studied and frequency synchronization channel estimation are simulated. LDPC-COFDM system composed of LDPC code,which is used as the channel coding technology of OFDM wireless communication system, is simulated and studied.The result has shown the promotion of the performance of PDPC-COFDM compared with OFDM.