Abstract
One of the most notable challenges in wireless communications is energy scarcity, which has attracted considerable attention in Fifth Generation (5G) wireless network research. This paper investigates the performance of energy harvesting (EH) relays under the best relay selection (BRS) scheme. The results show degradation of spectral efficiency (SE) due to EH relaying compared with conventional cooperative relaying (CR). Conversely, EH relaying provides a positive gain compared with conventional CR, increasing the lifetime of the network and decreasing energy consumption (EC) and operational cost. Moreover, the EH relaying network has better energy efficiency (EE) compared with conventional relaying networks. Results show that when EH relaying is applied, EE is improved through an increased number of relays. Finally, the SE-EE metric is presented for both conventional and EH relays. Results show that the performance of the proposed technique was able to achieve a maximum SE of 1.4 bits/s/Hz and maximum EE at 0.6 bits/s/Hz, and for the case of conventional relays, a maximum SE of 2 bits/s/Hz and EE at 1.1 bits/s/Hz. This result implies that the proposed EH scheme provides an optimum solution for energy-constrained wireless CR systems.
Highlights
Cooperative relaying (CR) provides a significant enhancement of energy-efficient transmission techniques by mitigating fading [1]
The simulation results have shown that the wireless energy harvesting (WEH) relaying performs better than conventional relaying especially at low signal to noise ratio (SNR), which leads to optimum solutions for energy-constrained systems
The spectral efficiency (SE)-EE trade-off metric is shown for both non-WEH and WEH relaying systems
Summary
Cooperative relaying (CR) provides a significant enhancement of energy-efficient transmission techniques by mitigating fading [1]. Wireless networks have developed considerably in terms of energy efficiency (EE). This development is driven by the needs of subscribers, design issues, satisfaction, and recently, the impact on the environment. The use of RF signals for SWIPT has recently become a valuable EH source due to its capability to carry information and energy simultaneously. The proposed system is considered in which the source, relays and destination are located in a small territory In this case, outage probability will be beneficial due to the restrictions decreed on the relays by the energy constraints. (iii) Derivation of the energy efficiency (EE) for AF-EH relaying, taking into account the outage probability factor and compare the results with conventional cooperative relaying with a different number of relays. Following notations is used in this manuscript: γm is the SNR thresholds for link adaptation, γsi is instantaneous SNR between S and Ri , γid is the instantaneous SNR between Ri and D, γsd is the SNR of the direct path between S and D, γbrs is the SNR of the best relay selection, γT is the combined SNR at the D, Γth is the SNR threshold
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