相关莱斯信道下MIMO-OFDM系统的容量特性  

Capacity characteristics of MIMO-OFDM systems under correlated Rician fading channels

作　　者：李建东[1] 庞继勇[1] 赵林靖[1] 

机构地区：[1]西安电子科技大学ISN国家重点实验室信息科学研究所宽带无线通信实验室,陕西西安710071

出　　处：《电路与系统学报》2008年第1期40-43,39,共5页Journal of Circuits and Systems

基　　金：国家杰出青年科学基金(60725105;通信网);国家自然科学基金重大项目(60496316);国家自然科学基金(60572146);高等学校博士学科点专项科研基金(20050701007);高等学校优秀青年教师教学科研奖励计划;教育部科学技术研究重点项目(107103)

摘　　要：通过将离散频域表示的信道冲击响应矩阵等效为由多径间相关和收发两端空域相关三者所确定的"Kronecker"相关信道模型,推导出了频率选择性莱斯衰落信道中MIMO-OFDM系统在同时具有这三种相关性条件下的各态历经容量公式。该公式为评估各种相关性对于MIMO-OFDM系统容量的影响提供了一个简单而有效的工具,并由Monte Carlo仿真给出了三种相关性、多径时延扩展对各态历经容量的影响。An explicit formula for the ergodic capacity of orthogonal frequency division multiplexing （OFDM）-based multiple-input multiple-output （MIMO） systems under correlated frequency selective Rician channels is derived, by simplifying the channel response matrix in frequency domain into the so-called ＇Kronecker＇ model composed of three kinds of correlations i.e. multipath tap gain correlation and spatial fading correlations at both transmitter and receiver. The derived formula is very simple and convenient for one to estimate the effects of all three kinds of correlations on MIMO-OFDM capacity. The validity of the new formula is verified. The effects of correlations and delay spread on the ergodic capacity are evaluated via Monte Carlo simulations.

关 键 词：多输入多输出 正交频分复用 KRONECKER乘积 各态历经容量 信道相关性 

分 类 号：TN911.22[电子电信—通信与信息系统]