MIMO-OFDM系统在选择性衰落信道下的容量分析  

Capacity analysis of the MIMO-OFDM system over frequency and time-selectivity fading channels

作　　者：吕卓[1] 李建东[1] 李维英[1] 

机构地区：[1]西安电子科技大学综合业务网理论与关键技术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：《西安电子科技大学学报》2005年第6期935-939,共5页Journal of Xidian University

基　　金：国家自然科学基金和微软亚洲研究院联合资助项目(60372048);高等学校优秀青年教师教学科研奖励计划;国家自然科学重大项目60496316第6子课题;教育部科学技术研究重点项目(104171);国家863计划课题(2005AA123910)

摘　　要：构造了M IMO-OFDM系统在频率和时间选择性衰落信道下的系统模型,分析了信道容量和选择性衰落分集的关系,得到了系统的中断概率和中断容量只和频率选择性分集数与时间选择性分集数的乘积有关.提出了一种等效的分析方法,得出了各态历经容量的一个紧密下界,随着发送天线数的增加,该下界会愈加紧密.通过Monte Carlo仿真,给出了在双重选择性衰落信道下系统的中断概率和中断容量的仿真结果.This paper first constructs the MIMO-OFDM system model over frequency- and time-selectivity fading channels. Then the connection between selective-fading diversity and capacity is analyzed, which shows that the product of the time-selectivity order and the frequency-selectivity order is the key parameter for characterizing the outage probability and outage capacity. An equivalent analysis method is proposed to give a tight low bound of ergodic capacity. It is also shown that this low bound becomes tighter with the increasing number of transmitter antennas. Finally numerical results of outage probability and outage capacity are shown by Monte Carlo simulation.

关 键 词：MIMO OFDM 选择性衰落 信道容量 

分 类 号：TN911.22[电子电信—通信与信息系统]