Multiple antennas and multiple radio frequency (RF) chains in both the transmitter and receiver are required in conventional radio systems employing the multiple-input multiple-output (MIMO) method. This paper presents an experimental investigation of a beam-steering time-modulated MIMO receiver with a single RF chain. Implementation of the receiver is based on a time-modulated antenna array (TMAA) and a software-defined radio. The sidebands generated inherently by the TMAA are utilized as virtual spatial channels with the beam-steering functionality. Performance of the system is investigated experimentally. The bit error rate and condition number of the channel matrix are examined for different radiation patterns in order to determine favorable configurations in a given multipath environment. Obtained results show a considerable impact of the beam-steering on the performance of MIMO transmission.

中文翻译：

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应用于具有单接收射频链和时间调制天线阵列的 2 × 2 MIMO 系统的波束控制的实验研究

在采用多输入多输出 (MIMO) 方法的传统无线电系统中，发射器和接收器中都需要多个天线和多个射频 (RF) 链。本文介绍了对具有单个 RF 链的波束控制时间调制 MIMO 接收器的实验研究。接收器的实现基于时间调制天线阵列 (TMAA) 和软件定义无线电。TMAA 固有生成的边带被用作具有波束控制功能的虚拟空间通道。系统的性能进行了实验研究。针对不同的辐射方向图检查信道矩阵的误码率和条件数，以确定给定多径环境中的有利配置。