多天线无线信道探测器及室内信道分析模型

MIMO wireless channel sounder and models for indoor channel analyses

为了准确描述多天线(multiple input multipleoutput,MIMO)宽带无线信道特性,设计了射频中心频率为3.52 GHz,带宽为20MHz的7×7 MIMO无线信道探测器。为了减小无线信道探测器中天线阵列辐射的方向特性对测量分析结果的影响,该文在暗室中对天线阵列的方向特性进行了测量,并建立了在使用较小的暗室、天线尺寸不可忽略的情况下,校正天线方向图的模型。此外,还建立了当室内反射物与接收天线阵列距离较近时,计算电磁波到达方向(DOA)的分析模型,给出了测量与分析的示例。仿真结果与测量结果表明,所建立的室内近距离模型比远距离模型估计更为准确。

A radio propagation measurement system was developed to measure the channel characteristics of a 7 ×7 multiple-inputmultiple output （MIMO） system at 3.52 GHz with a bandwidth of 20 MHz. The directional characteristics of the antenna array were calibrated in an anechoic chamber to minimize the directional effects bought by the attenna array. A calibration model is given using data measured in a small anechoic chamber where the antenna dimensions cannot be ignored. A direction of arrival （DOA） analysis model is given using data measured when the scatterer is near the receiver. Estimation results and indoor measurement results show that the estimation results of the short distance model are more accurate.