Impact of fixed power allocation in wireless energy harvesting NOMA networks

Abstract

The time switching-based relaying (TSR) scheme is considered in energy harvesting protocol to implement with its advantage to nonorthogonal multiple access (NOMA) system. In particular, decode-and-forward (DF) mode is proposed to employ in relay to forward signal to serve two far NOMA users. There are two main metrics including outage probability and ergodic rate, which are derived in exact expressions with respect to varying performance under impacts of energy harvesting fractions. To evaluate system performance, outage event and related capacity are illustrated, and we tailor performance gap among two NOMA users and such gap can be controlled by selecting of appropriate power allocation factors assigned for each user to obtain optimal performance. By examining node arrangement, target rates and varying transmit signal to noise ratio (SNR), it can be further achieved performance in several situations of such NOMA. As important result, the considered NOMA system outperforms than the conventional multiple access scheme, and this expected result is confirmed in numerical result and theoretical results. We also explore impacts of transmit power at source, noise power, the other key parameters of energy harvesting scheme to exhibit outage, and ergodic performance. Simulation results are presented to corroborate the proposed methodology. KEYWORDS decode and forward, energy harvesting, non-orthogonal multiple access, outage probability Int J Commun Syst. 2019;32:e4016.wileyonlinelibrary.com/journal/dac

An efficient hybrid energy harvesting protocol for cooperative NOMA systems: Error and outage performance

“…On the other hand, alternative wireless information and power transfer strategies are significant for the sustainable growth of wireless communications, especially with enormous energy consumption growth with ever-increasing connected devices [5,7]. In order to show the performance gain of EH-CNOMA over CNOMA without EH, the EC and OP of simultaneous wireless information and power transfer (SWIPT) aided CNOMA (SWIPT-CNOMA) have been evaluated [34][35][36][37]. The EH (TS and PS) for FD/HD CNOMA has been evaluated in terms of the OP and compared with conventional OMA [38].…”

“…By substituting (35) and ( 38) into (34), we find the OP of U 1 for EH CNOMA as given in (24). We use the same steps to calculate the OP of U 2 for EH CNOMA.…”

UAV-Enabled Cooperative NOMA with Indoor- Outdoor User-Paring and SWIPT in kappa-mu Channels

“…One for the duration of energy harvesting at the UAV-relay indicated as (τ T ) , where 0 < τ < 1 is the scaling factor for time division, and the remaining duration, i.e (1−τ )T 2 , is evenly distributed between the information processing and energy transmission for the second phase. By performing such a protocol to deploy EH at the UAV node, the harvested energy amount can be calculated as [28],…”

“…whereγ 1,2 is the average power link between the UAV-relay and I. By substituting ( 30) and ( 32) in (28), in order to obtain proposition 1. Hence, the proof is complete.…”

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