Abstract
In recent years, although non-orthogonal multiple access (NOMA) has shown its potentials thanks to its ability to enhance the performance of future wireless communication networks, a number of issues emerge related to the improvement of NOMA systems. In this work, we consider a half-duplex (HD) relaying cooperative NOMA network using decode-and-forward (DF) transmission mode with energy harvesting (EH) capacity, where we assume the NOMA destination (D) is able to receive two data symbols in two continuous time slots which leads to the higher transmission rate than traditional relaying networks. To analyse EH, we deploy time-switching (TS) architecture to comprehensively study the optimal transmission time and outage performance at D. In particular, we are going to obtain closed-form expressions for outage probability (OP) with optimal TS ratio for both data symbols with both exact and approximate forms. The given simulation results show that the placement of the relay (R) plays an important role in the system performance.
Highlights
Thanks to the significant rise in the number of mobile devices and the advancement of wireless technologies, they lead to the sustainable demand for better connection [1]
Multiple users in non-orthogonal multiple access (NOMA) systems can be served in a time slot, spreading code, or subcarrier [6]
In order to prove the robustness of the derived expressions, we compare with complementary Monte Carlo-simulated performance results
Summary
Thanks to the significant rise in the number of mobile devices and the advancement of wireless technologies, they lead to the sustainable demand for better connection [1]. Transfer and services from fourth generation (4G) networks This advancement contributes to the information access at anytime and anywhere with more applications and mobile services [2]–[4]. Multiple users in NOMA systems can be served in a time slot, spreading code, or subcarrier [6]. A technique so-called simultaneous wireless information power transfer (SWIPT) can help EH systems harvest energy from radio frequency (RF) signals. NOMA allocates different powers to multiple users [12]–[15]. The authors in [13] focused on a CR-NOMA adopting RS, and power allocation problems for half-duplex (HD) and FD in CR-NOMA systems were investigated in [14] to optimize the achievable data rate. The cumulative distribution function (CDF) and probability density function (PDF) of the random variable (RV) as FA x
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