Abstract—This paper investigates the performance of Energy Harvesting (EH) relaying with link adaptation for two combining schemes based on amplify-and-forward relaying systems. The first scheme defined as All Relay Participate (ARP), where the destination combines the received signals from all the relays, while the second scheme is known as Best Relay Selection (BRS) scheme, which used the relay that has the maximum Signal to Noise Ratio (SNR) at the destination. To simplify comparisons between the two schemes, total Probability Density Function (PDF) and moment generating function (MGF) for each scheme are derived and the spectral efficiency (SE) with link adaptation is presented. The trade-off between performance and complexity is compared by using the average number of active relays that participate in the cooperative diversity and Cumulative Distribution Function (CDF) of the link adaptation. The results show that the wireless EH relay performance at its maximum when utilize ARP scheme rather than BRS. However, the link adaptation performance is achieved at the expense of degradation in the spectral efficiency. In terms of practicality, the simulation results shown that the BRS performs better than ARP, since BRS requires a small number of active relay implementation for the wireless EH relay system.


Index Terms—Energy harvesting relaying, spectral efficiency, adaptive modulation, all relay participate, best relay selection.

Cite: Admoon Andrawes, Rosdiadee Nordin, and Mahamod Ismail, " Energy Harvesting with Link Adaptation under Different Wireless Relaying Schemes," Journal of Communications, vol. 13, no. 9, pp. 482-489, 2018. Doi: 10.12720/jcm.13.9.482-489.