MIMO系统的信道容量研究

多输入多输出技术能够有效提高信道容量和频谱效率,已成为下一代无线通信系统的关键技术之一。文中首先分析了空时信道的模型,在SVD分解的基础上得出了MIMO系统的信道等效于独立并行信道,即随着天线数目的增加,信道容量线性增长,然后针对高斯广播信道和多址接入信道,讨论了MIMO多天线系统的多维信道容量区域,并且着重分析了两者之间的对偶性关系。

A Study on the Channel Capacity of Multiple Input Multiple Output Systems

Multiple Input Multiple Output (MIMO) technique,which can increase the channel capacity and spectral efficiency,has become one of the key techniques of the next generation of wireless communication system.This article first studies the space-time channel models.Based on the singular value decomposition,the MIMO channel is equivalent to independent parallel channel,i.e.with the number of antenna increase,the channel capacity increases linearly.Then the paper discusses in detail the multi-dimensional channel capacity region of MIMO systems in the case of Gaussian multiple-access channels and Gaussian broadcast channels,where the duality of the two channels is emphatically analyzed.