两种典型的MIMO系统信道容量分析与仿真

Capacity Analysis and Simulation for Two Typical MIMO Systems

为了研究多输入多输出系统的信息论基础 ,从信息理论的角度给出其理论依据 ,本文通过从信息论角度对使用多个发射、多个接收天线的MIMO系统的信道容量进行的理论推导 ,得到了MIMO系统在输入信号向量为循环对称复高斯输入信号向量且平均分配发射功率条件下 ,可以达到比传统单发单收无线通信系统高的多的信道容量的结论 ,得到了信道容量公式 ,并据此分析研究了全 1和单位传输矩阵所对应的两种典型的MIMO系统的信道容量 ,给出了一种更容易理解的信道容量的虚拟等效实现结构 ,以便理解其取得高信道容量的原因及条件 ;

In order to form a solid information theory and application foundation for the hot-research MIMO system, which is the most suitable candidate for future high-data-rate wireless communication systems, MIMO channel's capacity formula was studied. With a circularly symmetric complex Gaussian input signal vector and equally-distributed signal power through all the transmit antennas, a much higher capacity can be achieved compared to the traditional SISO system. Furthermore, two typical MIMO systems of the channel matrix with all 1's elements channel matrix and the unit channel matrix were analyzed thoroughly for their capacity, followed by our proposed virtual equivalent structures. Finally simulation results were presented to verify the significant MIMO capacity.