Dynamic Interference Avoidance in the Joint Space-Time Domain with Arbitrary Antenna Formations

We design, implement, and demonstrate a hardware-reconfigurable multiple-input multiple-output (MIMO) transceiver that computes in real-time the transmit multi-antenna beam weight vector and time-domain coded waveform that maximize the signal-to-interference-plus-noise ratio (SINR) at the output of the maximum SINR joint space-time receiver filter. To the best of our knowledge, this is the first demonstration of autonomous hands-free high-throughput communications by jointly optimizing the space and time domain shape of waveforms in heavily congested or contested spectrum environments. Implementation of the self-optimized interference-avoiding MIMO wireless link is carried out on a Radio-Frequency System-on-Chip (RFSoC) software-defined radio (SDR) using the Xilinx Zynq Ultrascale+ RFSoC ZCU111 platform. We experimentally evaluate the performance of the proposed dynamic waveform in a 4x4 MIMO wireless link in terms of pre-detection SINR in the presence of different levels of co-channel interference and arbitrary antenna formations in an indoor laboratory environment.