MIMO-OFDM系统中LDPC编码和自适应比特功率分配算法研究  

Study of LDPC Coding and Adaptive Bit Power Allocation in MIMO-OFDM System

作　　者：霍永青[1] 彭启琮[1] 

机构地区：[1]电子科技大学通信学院,成都610054

出　　处：《电子与信息学报》2008年第2期404-407,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金重大项目(60496313)

摘　　要：该文提出了将LDPC码与自适应比特功率分配相结合应用于MIMO-OFDM系统中的算法。文中分别对两种不同码率的LDPC码与自适应OFDM,自适应MIMO-OFDM相结合的算法进行了仿真,同时还对未编码的自适应OFDM以及MIMO-OFDM进行了仿真。仿真结果显示,在相同的传输带宽以及相同的传输信息量(即数据"净码率")情况下,采用低码率LDPC编码的自适应OFDM系统的性能要比未编码的自适应OFDM以及自适应MIMO-OFDM系统的性能好;采用高码率LDPC编码的自适应OFDM系统的性能比未编码的自适应OFDM系统性能好,但比未编码的自适应MIMO-OFDM系统性能差。In this paper, an algorithm of LDPC codes and adaptive bit power allocation in MIMO-OFDM system is proposed. The algorithms of LDPC codes with two different code rate and adaptive OFDM/MIMO-OFDM are simulated, at the same time, the adaptive algorithms of OFDM/MIMO-OFDM without coding are simulated. The simulation results show that, with the same transmission bandwidth and the same transmission entropy, the performance of adaptive OFDM system with lower rate LDPC codes is better than that without coding. Furthermore, the performance of adaptive OFDM system with high rate LDPC codes is better than that of adaptive OFDM, but worse than that of adaptive MIMO-OFDM.

关 键 词：MIMO—OFDM LDPC编码 自适应分配 频率选择性衰落 

分 类 号：TN92[电子电信—通信与信息系统]