Spatially-Correlated Hardware-Impaired Massive MIMO FD Relaying with MIMO Users

A practical massive multi-input multi-output (mMIMO) relay, due to limited antenna spacing and the use of cost-effective equipment, usually experiences spatially correlated channels and hardware impairments, respectively. We consider a hardware-impaired two-way full-duplex (FD) spatially-correlated mMIMO relaying with multi-antenna FD user-pairs, and derive a closed-form spectral efficiency (SE) expression which is valid for a practical number of finite relay antennas. We next use this closed-form SE result to obtain asymptotic hardware and power scaling laws, which are not present in the existing literature. We also numerically validate the closed-form SE expression and study the impact of spatial correlation and hardware impairments on SE.