多径衰落信道MIMO-OFDM系统容量分析与仿真  

Analysis and Simulation of Capacity for MIMO-OFDM System in Multipath Fading Channel

作　　者：李莉[1] 王珂[1] 韩力[2] 

机构地区：[1]吉林大学通信工程学院,吉林长春130012 [2]吉林大学物理学院,吉林长春130012

出　　处：《计算机仿真》2008年第2期141-144,共4页Computer Simulation

基　　金：国家通信与抗干扰重点实验室研究项目

摘　　要：为了分析MIMO-OFDM系统性能,研究了MIMO-OFDM系统在瑞利多径信道下的容量。首先,就可识别路径数及信道相关性对MIMO-OFDM系统容量影响进行了分析与仿真,仿真结果表明,MIMO-OFDM系统的容量随着多径数的增加而增加,但当多径数较大时,容量增加量逐渐减小;相关性给MIMO-OFDM系统带来容量损失,随着相关程度的增加,容量损失急剧增加。其次,对MIMO及MIMO-OFDM系统容量进行了比较,研究表明,MIMO-OFDM系统的容量集中度比MIMO系统好,并且,信噪比为10dB时,MIMO-OFDM系统的容量比MIMO系统容量大4bit/s/Hz左右。For analysing MIMO - OFDM system performance, the capacity of MIMO - OFDM system in Rayleigh multipath channel is investigated. The effects of the number of resolvable paths and channel correlation on the capacity of broadband MIMO - OFDM systems are analyzed and simulated. Simulation results show that the c-apaeity of MIMO - OFDM systems is increasing with the numbers of resolvable paths, but when the number of resolvable paths is bigger, increase is samll. The amount of correlation strongly influences the capacity of MIMO- OFDM systems, and the capacity is rapidly reduced along with correlation coefficient increasing. In additio - n,the capacity of MIMO is compared with that of MIMO - OFDM system. It shows that the variation of the capacity of MIMO - OFDM system is smaller than that of MIMO system,and MIMO - OFDM system outperforms MIMO system with respect to the capacity by 4 bit/s/Hz if the SNR is 10dB.

关 键 词：容量 多输入多输出 正交频分复用 多径衰落信道 相关 

分 类 号：TN929[电子电信—通信与信息系统]