【摘要】 视距环境下的MIMO系统无法获得空间自由度增益.为了在视距环境下充分发挥MIMO系统的性能,提出了一种次优的中继节点布置策略,能够在增加少量中继节点后获得较佳的系统性能.在该策略中,根据MIMO系统能提供的最大空间自由度确定中继节点的数量,并且根据收发天线阵列的波束主瓣方向确定各个中继节点的位置.仿真结果表明,在较高信噪比时,系统容量优于加入中继节点前,随着信噪声比增加,优势愈明显.并且中继节点位置出现偏差时,系统性能仅存在很小的波动.更多还原

【Abstract】 No spatial degree-of freedom gain is obtained for MIMO system in Line-of-Sight(LOS) environments.A suboptimal deploying strategy of relay nodes is developed to improve performance in LOS MIMO system,which require only a few relay nodes.In this strategy,the number of relay nodes is determined by the maximum number of spatial degree of freedom provided by MIMO system.And the location of relay nodes is determined by direction of main lobes of transmit and receive antennas.Simulation results indicate that,compared to LOS MIMO system,the system based the scheme obtains capacity gain in large SNR which become larger as SNR become larger.Moreover,system capacity only fluctuates a little when the positional deviation of relay nodes happens.更多还原