Outage analysis of mmWave-NOMA transmission in the presence of LOS and NLOS paths

Abstract

Non-orthogonal multiple access (NOMA) as an enabling technology can be integrated with millimeter-Wave (mmWave) communication to achieve massive connectivity and better spectral efficiency in future wireless cellular networks. In this work, to reduce the system overhead, random beamforming is employed in the mmWave-NOMA networks where we optimized the power allocation factors to improve the random beamforming performance. Also, the impact of the non-line-of-sight (NLOS) path alongside the line-of-sight (LOS) path is analyzed under the outage probability term. Based on the distance between the base station (BS) and machine type communication (MTC) device, novel clustering schemes involving the near, mid-cell and far device are proposed. The proposed clustering schemes are named as (1) RRR consisting of one random device from each section, (2) NNN involving the nearest device from each region, and (3) NFF containing the nearest device to the BS from the near section, and the farthest device to the BS from both middle and far parts. The clustering schemes can be considered as a trade-off between the system overhead and outage performance. Finally, computer simulation results are presented to show the accuracy of the developed analytical and approximation results.