平坦瑞利衰落信道下MIMO系统性能

分析了瑞利衰落对普通无线系统的影响,在此基础上重点从空间复用提高容量和空间分集对抗衰落两方面研究了瑞利衰落信道下MIMO系统的性能。分析和仿真结果表明,采用V-BLAST算法实现空间复用增益时,随着收发天线数目的增加,复用系统的符号错误概率增加;不同的分集结合方式对分集系统性能的影响不一样,随着天线数目的增加,分集系统的符号错误概率都递减。

Performance of MIMO System In Slow Flat Rayleigh Fading Channels

The channel model of MIMO system is introduced first,then the effect of Rayleigh fading on the symbol error probability for 16-QAM and the performance on the capacity of MIMO system are analyzed based on this.The performance of MIMO system in slow flat Rayleigh fading channel is studied from these two aspects including spatial multiplexing and spatial diversity.The results of analysis and simulation show that the symbol error probabilities of spatial multiplexing system realized by V-BLAST algorithm increase with the increase of the number of transmitting and receiving antennas.And different diversity combing techniques have different influence on the system performance in which MRC is the best,EGC takes second place and SC is bad;and the symbol error probabilities of spatial diversity system decrease with the increase of the number of transmitting and receiving antennas.