多输入多输出系统信道容量研究
On Channel Capacity of MIMO Systems
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摘要: 该文研究接收端采用均圆阵天线阵放置空间有限的条件下，存在相关衰落时MIMO系统的信道容量。建立了衰落相关模型，分析了散射角大小及天线数对信道容量的影响，采用随机理论推导了MN的MIMO系统信道容量的闭式解。分析结果表明，MIMO系统信道容量主要由衰落相关矩阵的特征值决定。仿真结果表明，在接收端空间有限的情况下，天线数增大到一定程度时，信道容量达到饱和，再增加天线数，对信道容量的影响很小。
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关键词:
- 移动通信;MIMO;信道容量
Abstract: The paper studies the capacity of a Multiple Input Multiple Output (MIMO) system with correlated fading under the constrain of fixed space for the receiver UCA antennas. The fading correlation model is established and the impacts of the number of antennas and scattering angle on the channel system capacity are investigated. Based on the random theory, a closed-form expression for the channel capacity of an M by N MIMO system is derived. Analysis shows that the channel capacity of a MIMO system is mainly determined by eigenvalues of the fading correlated matrix. Simulation shows that the channel capacity is saturated when the number of antennas increases to a certain point. -
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