Abstract: Distributed MIMO system combines the characteristics of MIMO channel and distributed antenna system, which is believed a very promising technology in the future of 4G, because of its large capacity, large coverage and less power loss from shadow and distance. A compound channel model considering path loss, lognormal shadow fading and small scale fading for distributed MIMO system model is adopted, the capacity of which is analyzed. Besides channel capacity between distributed MIMO system and centralized MIMO system is compared by Monte Carlo simulations. At the same time, the impact of spatial fading correlation and path loss on the capacity is also investigated. The simulation results prove that distributed MIMO system can effectually reduce the impact of small scale fading, and achieve a better channel capacity.

Key words: Multiple Input Multiple Ouput（MIMO）, distributed antenna system, channel capacity, wireless communication

摘要： 分布式MIMO系统结合了MIMO技术和分布式天线系统两者的特点，具有高容量、大覆盖范围、低损耗的优势，在未来4G通信中具有很好的应用前景。基于包含了路径损耗、阴影衰落和相关小尺度衰落的分布式MIMO信道模型，通过Monte Carlo仿真比较分析了分布式MIMO系统和集中式MIMO系统的信道容量，研究了空间相关性和路径损耗对信道容量的影响。仿真实验结果表明，分布式MIMO系统能有效降低小尺度衰落相关性的影响，可以获得更好的平均信道容量。

关键词: 多输入多输出, 分布式天线系统, 信道容量, 无线通信