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Optimal Relay Selection Scheme with Multiantenna Power Beacon for Wireless-Powered Cooperation Communication Networks
Oussama Messadi1, Aduwati Sali1, Vahid Khodamoradi1
1Wireless and Photonic Networks Research Centre of Excellence (WiPNET), Department of Computer and Communication Systems Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia.
Sensors (Basel, Switzerland)
|January 1, 2021
Summary
A new two-round relay selection (2-RRS) scheme significantly improves wireless-powered cooperative communication networks by enhancing throughput and reducing outage probability. This novel approach optimizes relay selection for better performance compared to existing methods.
Area of Science:
- Wireless communication networks
- Cooperative communication systems
- Energy harvesting and wireless power transfer
Background:
- Traditional cooperative networks rely on reception reliability for relay selection.
- Wireless-powered cooperative communication networks (WPCCNs) require consideration of both reliability and transmission requirements.
- Efficient transmission techniques are needed to overcome radio frequency (RF) signal attenuation without increasing power.
Purpose of the Study:
- To propose a novel relay selection scheme for wireless-powered cooperative communication networks assisted by a multi-antenna power beacon (PB-WPCCN).
- To analyze and compare the performance of the proposed scheme against existing methods in terms of outage probability and system throughput.
Main Methods:
- Introduction of a two-round relay selection (2-RRS) scheme: first round selects relays that decode information, second round selects the optimal relay.
- Derivation of analytical closed-form expressions for outage probability and average system throughput.
- Validation of analytical results through numerical simulations and comparison with Partial Relay Selection (PRS) and Opportunistic Relay Selection (ORS) schemes.
Main Results:
- The proposed 2-RRS scheme achieves approximately 17% higher throughput than ORS and 40% higher than PRS, especially at 10 dB PB transmit power.
- 2-RRS guarantees the lowest outage probability, particularly when the PB uses multi-antenna beamforming.
- Optimal PB localization is scheme-dependent, and 2-RRS requires shorter energy harvesting time for maximum throughput, indicating necessary tradeoffs.
Conclusions:
- The 2-RRS scheme offers superior performance in wireless-powered cooperative communication networks.
- The study highlights the importance of considering transmission requirements alongside reliability in relay selection for WPCCNs.
- Tradeoffs between energy harvesting time, number of relays, and system throughput must be carefully considered for optimal network design.
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