Optimized Irregular LDPC Codes Design for OFDM System
Xiaofeng Tao · Beijing Youdian Xueyuan xuebao · 2006
A simplified and optimized low density parity check(LDPC) codes for orthogonal frequency division multiplexing(OFDM) transmission is proposed.Making consideration of the channel fading characteristic and iterative decoding principle,high variable degree is used in deep fading sub-channel and low variable degree in light fading sub-channel.Simulation results show that the scheme exhibits a gain of 3?dB at bit error rate(BER) of 10~(-5) when code length is 1?024 and code rate is 1/2 compared to regular codes and reduces the complexity of optimization design.