In this paper, we employ multiple wireless-powered relays to assist information transmission from a multi-antenna access point single-antenna receiver. The wireless can operate in either the passive mode via backscatter communications or active RF communications, depending on their channel conditions and energy states. We aim maximize overall throughput by jointly optimizing transmit beamformin...

Visible light communication (VLC) has been deemed to be one promising technique for the sixth-generation wireless network. However, due attenuation properties, VLC ranges are usually limited. To unlock advantage of multiple light-emitting diodes (LEDs) and extend coverage systems, a relay-aided system with non-orthogonal access (NOMA) is proposed in this paper. Specifically, decode-and-forward ...

This paper investigates the performance of a new framework for low-outage downlink non-orthogonal multiple access (NOMA) using coordinated direct and relay transmission (CDRT) scheme with links to both near-user (NU) far-user (FU). Both amplify-and-forward decode-and-forward relays are considered. In this framework, NU combines signals from base-station at each stage successive interference can...

Cognitive radio (CR) is one of the emerging technologies for 4G/5G applications. Cooperative relay communications and network coding are some techniques that helped in enhancing CR This paper considers a primary broadcasting system multimedia video streaming applications broadcasts data to users an aiding cooperative secondary system. The overlay can use many error control point-to-point retran...

Multi-User scheduling is a challenging problem under the relaying scenarios. Traditional schemes, which are based on the instantaneous signal-to-interference-plus-noises ratios (SINRs), cannot solve the inherent disparities of the qualities between different links. Hence, the system performance is always limited by the weaker links. In this paper, from the whole system throughput view, we propo...

The authors investigate the relay-aided multicell multiple-input–multiple-output (MIMO) cellular network by comparing both the signal forwarding and interference forwarding relaying paradigms, each employing the adaptive MIMO relay scheme. The spectral, energy and economic efficiency values are utilised as key performance metrics. Furthermore, both radio frequency and circuit power consumption ...

In this paper, an interval approach is presented to achieve perfect selectivity and maximum sensitivity in distance relay zones, considering uncertainties. For this purpose, first, the uncertainties affecting the settings of the three zones of a distance relay are discussed. Then, by using the Monte-Carlo simulation, the uncertainties are modelled and the impedances seen by the distance relay a...