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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。
In order to accurately describe the characteristics of multiple input multiple output (MIMO) broadband wireless channel, a 7 × 7 MIMO wireless channel detector with a 3.52 GHz radio frequency center and 20 MHz bandwidth was designed. In order to reduce the influence of the directional characteristics of the antenna array radiation in the wireless channel detector on the measurement and analysis results, the directional characteristics of the antenna array are measured in a dark room, and the antenna size can not be neglected in a smaller darkroom , The model of the antenna pattern is corrected. In addition, an analytical model for calculating the direction of arrival of electromagnetic waves (DOA) is established when the distance between the indoor reflector and the receiving antenna array is short, and examples of measurement and analysis are given. The simulation results and measurement results show that the established indoor close-range model is more accurate than the long-range model.