Lens Assisted Massive Antenna for mm-Wave Communication Systems

Abstract

It is believed that the massive multiple-input multiple-outputs (mMIMO) paradigms are a considerably favorable approach for the upcoming generation of communication systems (with high spectral efficiency) that have aided through the mm-wave (millimeter-wave) technique. However, due to the large number of components (i.e., chains of radio-frequency, a.k.a. RF for short), such paradigm schemes (i.e., mmWave mMIMO) face challenges in terms of energy and hardware implementation costs. In this context, the Lens Antenna technique can help reduce the number of radio-frequency components needed while maintaining considerable performance.
In addition, increasing the number of uses that can be served within the same beam and frequency/ time resource element can be achieved through the idea of non-orthogonal multiple access (NOMA for short) to overcome the number of radio frequency components employed in the system, such that the entire number of supported users will be more than the available radio frequency components. This research considers enhancing the throughput metric for a Lens-Assisted Massive Antenna NOMA system. In particular, the work introduces an uncomplicated iterative approach with sub-optimal spectral performance via a simple Block Diagonalization and a mid-point optimization method. The bandwidth efficiency gains for the suggested approach, if compared to the classical orthogonal multiple access technique and interference nulling beamforming, are about 13.5 % enhancement.