Performance Simulation of LDPC Codes under OFDM System

By means of the analysis of decoding algorithms in different modulations mode,this paper uses the sum product algorithm unsder high-order modulation to LDPC-OFDM system,in which LDPC code is brought out by the random construction of PEG,and is compared with the Turbo-OFDM system.Simulation result shows that the performance of short length LDPC code is better than Turbo code when the code rate and the SNR is high.