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Cooperative Non-Orthogonal Multiple Access over Log-Normal Power Line Communication Channels

Department of Electronics and Control Engineering, Hanbat National University, Daejeon 34158, Korea
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Electronics 2019, 8(11), 1254; https://doi.org/10.3390/electronics8111254
Received: 11 September 2019 / Revised: 9 October 2019 / Accepted: 15 October 2019 / Published: 1 November 2019
(This article belongs to the Special Issue Advances of Power Line Communication (PLC))
In this paper, we analyze the performance of cooperative power domain non-orthogonal multiple access (NOMA) in power line communication (PLC) networks. Due to the high signal attenuation of the source to user links, a relay aids communication from the source to two users. With half-duplex transmission, the source transmits a superimposed symbol in the first phase. The relay utilizes amplify-and-forward (AF) and decode-and-forward (DF) protocol on the received superimposed signal and forwards it to the users in the second phase. We derive analytic expressions for the outage probability and the system throughput of the proposed system under a PLC log-normal channel with impulsive noise. Based on the results for AF NOMA relaying case, we analyze the system performance at high signal-to-noise ratio (SNR) and derive closed-form lower and upper bounds for the outage probability. Simulation results show an improvement in the outage probability and the system throughput performance of the AF and DF NOMA schemes compared to the NOMA without relaying transmission and conventional orthogonal multiple access scheme. Furthermore, the impact of the channel variance is highlighted in the results. It is shown that the DF NOMA has a better outage probability than the AF NOMA scheme for low channel variance scenarios (i.e., less branches and connected loads in the PLC network). However, as the channel variance increases, AF NOMA scheme has similar outage probability performance as the DF NOMA scheme. In addition, it is shown that the system throughput is enhanced when the relay employs DF relaying compared to AF relaying. View Full-Text
Keywords: power line communication; non-orthogonal multiple access; amplify-and-forward relaying; decode-and-forward relaying; outage probability; system throughput power line communication; non-orthogonal multiple access; amplify-and-forward relaying; decode-and-forward relaying; outage probability; system throughput
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MDPI and ACS Style

Ahiadormey, R.K.; Anokye, P.; Lee, K.-J. Cooperative Non-Orthogonal Multiple Access over Log-Normal Power Line Communication Channels. Electronics 2019, 8, 1254.

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