CAJ | 학술논문

多进制低密度奇偶校验（Low-Density Parity-Check,LDPC）码作为一种现代高效纠错码将会是RS码的一个很好替代码型。现代通信系统需要可靠且频谱有效的数据传输,针对多进制LDPC编码调制系统,文章分析和讨论了多进制LDPC编码调制系统在Ray-leigh和Rice衰落信道下的性能。引入了Rayleigh和Rice衰落信道模型,在此基础上建立了多进制LDPC编码调制系统,给出了迭代译码的初始化条件。仿真结果表明多进制LDPC码本身具有很好的交织和抗衰落特性,相比于二进制LDPC编码调制系统,多进制LDPC编码调制系统在衰落信道下的性能非常优良。
다진제저밀도기우교험（Low-Density Parity-Check,LDPC）마작위일충현대고효규착마장회시RS마적일개흔호체대마형。현대통신계통수요가고차빈보유효적수거전수,침대다진제LDPC편마조제계통,문장분석화토론료다진제LDPC편마조제계통재Ray-leigh화Rice쇠락신도하적성능。인입료Rayleigh화Rice쇠락신도모형,재차기출상건립료다진제LDPC편마조제계통,급출료질대역마적초시화조건。방진결과표명다진제LDPC마본신구유흔호적교직화항쇠락특성,상비우이진제LDPC편마조제계통,다진제LDPC편마조제계통재쇠락신도하적성능비상우량。
Nonbinary low-density parity-check（LDPC） codes,as modern efficient error correcting codes,may be used to replace RS codes properly.A reliable and bandwidth-efficient data transmission with reasonable delay and good error performance is required in modern communication systems.The performances of nonbinary LDPC coded modulation systems over Rayleigh and Rice channels are analyzed and discussed.The Rayleigh and Rice fading channel models are introduced.The nonbinary LDPC coded modulation system is established based on the models,and the initialization of iterative decoding is presented.Simulation results show that nonbinary LDPC codes have good interleaving performance and anti-fading capability.Nonbinary LDPC coded modulations can achieve a better performance than binary LDPC coded modulations over fading channels.