Full Duplex MIMO Digital Beamforming with Reduced Complexity AUXTX Analog Cancellation

Abstract

In this paper, we present an analog canceller architecture combined with transmit and receive digital beamforming for reduced complexity Full Duplex (FD) Multiple Input Multiple Output (MIMO) systems. Our proposed analog cancellation architecture comprises of AUXiliary (AUX) Transmitters (TX) and a novel use of DEMUltipleXers (DEMUX) that enables flexible signal routing for the signals at the AUXTX outputs. This signal routing allows a reduction in the number of AUXTX that are required for analog cancellation compared to State of the Art (SotA) architectures. We also present a novel transmit and receive beamforming design that takes into account the constraints imposed by the analog canceller architecture. We provide representative simulation results that demonstrate the superiority of our FD MIMO design compared to SotA approaches.