一种基于MIMO系统的三维空时无线信道仿真模型

提出一种基于多输入多输出(MIMO)系统的三维空时无线信道仿真模型。针对双发射/双接收天线情况,利用频率-延迟-角度的联合统计相关函数,推导含有散射体、波达角、角度延展及时延等信道参数的无线信道响应模型。模型具有能够通过仰角和方位角观察多普勒频移的变化,能够精确地描述不同接收天线的相位延迟,空时特征容易参数化等特点。利用Matlab仿真软件在宏小区和微小区仿真环境下测试该模型,试验结果表明,从任意发射天线到任意接收天线的幅度增益并没有受到固定散射体较大的干扰,基站和移动端空间相关性系数的理论值与仿真值都能较好地匹配。

A 3-D Space-Time Wireless Channel Simulation Model Based on MIMO Systems

This paper proposes a 3-D space-time wireless channel simulation model for MIMO systems,which is based on the correlation of scattering centers,direction of arrival(DOA),azimuth spread and time delay.For simplification,the paper only considers the dual transmitter/dual receiver MIMO system,and gains channel impulse responses with frequency-time delayangle delay correlation.And the model can exactly give the phase delay of wireless channel,and simplify space-time character.The purpose of the model is to analyze the space-time correlation easily.This model analyzes the relation of antenna spacing distance and space correlation coefficient effectively.The results from theory analysis show that antenna gains would not be destroyed by the increasing scatters.By Matlab simulation,the results from simulations show that the model could describe the space correlation based on the macro area and the micro area.The theoretical values of the space correlation coefficients of the base station and the mobile terminal agree well with simulation values.