A LDPC and Turbo Codes Hybrid Coding Scheme Based on OFDM System

In this paper, we employ to provide a method which combines Turbo codes and Low-Density Parity-Check (LDPC) codes based on Orthogonal Frequency Division Multiplexing (OFDM) system by adaptive encoding. The technique of channel estimation is used. The code rate and encoding scheme are all adaptive selection in the light of different channel conditions, so that we can make good use of these two types of codes' respective advantages. This new method can guarantee the quality of service and pursuit of maximum useful bit rate. Through analysis and simulation, we show the better bit error rate (BER) performance compared to conventional method.