Abstract
In this paper, we investigate the performance of non-orthogonal multiple access (NOMA)-based full-duplex Internet-of-Things (IoT) relay systems with simultaneous wireless information and power transfer (SWIPT) over Nakagami-m fading channels to improve the performance of a cell-edge user under perfect and imperfect successive interference cancellation (SIC). Two scenarios, i.e., direct and non-direct links, between the source node and cell-edge user are examined. The exact closed-form analytical and approximate expressions for the outage probability, system throughput, energy efficiency, and ergodic capacities are derived and validated via Monte Carlo simulations to characterize the proposed system performance. To further improve the system performance, we also provide a low-complexity algorithm to maximize the system throughput over-optimizing the time-switching factor. The results show that our proposed NOMA system can achieve superior performance compared to its orthogonal multiple access (OMA) counterpart under perfect SIC and with a low-to-medium signal-to-noise ratio under imperfect SIC, according to the level of residual self-interference and the quality of links.
Highlights
An exponential growth in the number of devices in the Internet of Things (IoT) network leads to massive connectivity and an increase in demand for spectrum usage [1–3]
Regarding iSIC, the results show that the system throughput performance of the non-direct link (NL) scenario degrades significantly with ψ1 = 0.08 and ψ2 = 0.8, while the system throughput performance of the direct link (DL) scenario is close to the bounded region with a high signal-to-noise ratio (SNR)
We propose a novel FD simultaneous wireless information and power transfer (SWIPT) cooperative Non-orthogonal multiple access (NOMA)-based IoT relay network under the impact of perfect SIC (pSIC) and iSIC processes, where the selection combining (SC) technique is employed at a cell-edge user to improve the performance via IoT relay by adopting the NOMA
Summary
An exponential growth in the number of devices in the Internet of Things (IoT) network leads to massive connectivity and an increase in demand for spectrum usage [1–3]. The performance of hybrid EH in SWIPT NOMA for relaying networks was investigated in [18], where the energy consumption with full channel state information at the transmitter (CSIT) and system outage probability (OP). In [19], Tung et al proposed a novel cooperative direct and relay transmission for a NOMA-based IoT relay network, where one master IoT node simultaneously serves a cell-edge user and IoT user acting as a decode-and-forward (DF) relay in HD mode, aiming to enhance the ergodic sum capacity. Motivated by the above observations, we propose an FD SWIPT cooperative NOMA-based IoT relay network over Nakagami-m fading channels where two scenarios with and without a direct link between the source node and cell-edge user are considered F X (·) and FX (·) denote the probability density function (PDF) and cumulative distribution function (CDF) of a random variable X, respectively
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