An Effective Design Approach to Implementation of MIMO-SDM-PNC Relay Stations on FPGA

This paper presents an effective design approach to implementing the signal processing unit in the relay node in a two-way relay MIMO spatial division multiplexing (MIMO-SDM) system using physical-layer network coding (PNC), referred to as MIMO-SDM-PNC. The structure of the proposed MIMO-SDM-PNC relay node is based on a proven low-complexity algorithm that is rigorously optimized at a micro-architectural level for FPGA implementation. The final digital implemented MIMO-SDM-PNC has been evaluated using Vivado 2019.2. The implementation results show that in a case study of a 4 × 4 MIMO system, the relay node achieves up to 7 Gbps, quasi-ML BER performance with reasonable hardware cost on typical commercial FPGA devices.