Cooperative Hybrid-NOMA / Dynamic SWIPT - Pairing Mechanism for 6G THz Communications

Abstract

The simultaneous wireless information and power transfer (SWIPT) technique is adopted to alleviate the coverage limitation of terahertz (THz) communications and increase spectral and energy efficiencies. However, previous proposals for fixed relaying devices are still insufficient. Thus, it is critical to developing a qualified SWIPT-pairing mechanism to select the relaying non-orthogonal multiple-access (NOMA) users to provide THz transmission assistance for the obstructed or cell-edged receivers that receive attenuated signals, considering the infrastructure dynamism and relaying users’ mobility. The work in this paper presented a simplified automated strategy for the selection of the optimal relaying user-equipment out of the line of sight (LOS) users to the targeted user. It optimized a scalable two-user cooperative SWIPT pairing scheme using hybrid-NOMA and terahertz frequency bands. Its objective was to enhance the performance of modern wireless communications in terms of reliability, robustness, capacity, technical resourcefulness, and user fairness. Users’ performance is investigated based on the manipulation of the developed mechanism. The conducted results demonstrated a noticeable development of energy and spectral efficiencies in contrast with the state-of-the-art by more than 70%. This promising system/mechanism reduced system hardware (i.e., replaced fixed relays) and complexity (i.e., two-user clusters) with evolving THz coverage area, reliability, cost-effectiveness, simplicity, and dynamism.