Characterization of mmWave X‐duplex multi‐relay system in 5G mobile network

Abstract

In this paper, we propose a millimeter wave (mmWave) X-duplex (XD) amplify-and-forward (AF) multirelay system for 5G and beyond. Each XD AF relay is equipped with a shared antenna for both transmission and reception radio frequency (RF) chains. Also, the performance of mmWave XD AF multirelay system is analyzed, and a relay selection method in this scenario is suggested, where the best relay and the best operation mode are selected based on maximum end-to-end signal-to-interference-plus-noise ratio (SINR).XD relays can switch adaptively between half-duplex (HD) and full-duplex (FD) operation modes. As a practical channel model, Rician fading, path loss with line-of-sight (LOS) and non-line-of-sight (NLOS) propagation, and blockage effects are considered for mmWave channel model in both source-relay and relay-destination links. We derive closed-form expressions for end-to-end SINR and its distribution, outage probability, energy efficiency (EE), rate, and average symbol error rate (SER) based on the relay selection method. Monte Carlo simulations are performed to validate our analytical derivations, and also, the simulation results depict that XD relays outperform both HD and FD operation modes in terms of outage probability, EE, SER, and rate. Furthermore, the effects of self-interference (SI) cancellation, blockage, and number of XD AF relays over the performance and also the comparison of XD relay selection to different existing relay selection policies are presented. In addition, it is shown that the XD relay selection method in our proposed system eliminates the performance floor of the FD caused by the residual SI that it is considered as a significant advantage of our proposed system.

Improving Performance of the Typical User in the Indoor Cooperative NOMA Millimeter Wave Networks with Presence of Walls

“…The Free Cell Massive Multi-Input Multi-Output (MIMO) performance was also examined under the effects of LoS/nLoS scenarios in References [2,3]. In another work [5], the LoS/nLoS path loss model was utilized to examine the performance of the 5G X-duplex multi-relay system. In recent work [6], the different layouts of walls and their properties such as distribution, length, and penetration loss were studied in terms of modeling and performance evaluation.…”