Interference-Avoiding RFSoC-based MIMO Links

We consider the problem of dynamically optimizing multi-antenna wireless links that may or may not be directional for immunity against co-channel interference over a fixed frequency band. In this demo, we present a 4x4 multi-antenna link implemented on the field-programmable-gate-array (FPGA) fabric of the AMD/Xilinx Zynq Ultrascale RFSoC ZCU111 evaluation board to demonstrate dynamic interference avoidance in the presence of either narrowband or wideband co-channel interferers. We demonstrate two modes of operation for the link of interest: (i) beamforming mode with beam steering at Tx and conventional/adaptive null-steering beamformer at Rx, and (ii) diversity mode with no beamforming at either side of the link. We use MATLAB App designer to build a standalone application to visualize the beamforming response and control the configuration of co-channel interferers such as number, modulation, and bandwidth and monitor link parameters including error vector magnitude (EVM), direction-of-arrival (DoA), and received constellation.