Decode-and-Forward Relaying for Cooperative NOMA Systems With Direct Links

Liu, Hongwu; Ding, Zhiguo; Kim, Kyeong Jin; Kwak, Kyung Sup; Poor, H. Vincent

doi:10.1109/twc.2018.2873999

Cited by 94 publications

(82 citation statements)

References 42 publications

(66 reference statements)

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“…It can be also explained according to Eqs. (32), (34), (36), (38). Besides, the ergodic rate of User 2 for C-NOMA with direct link is the highest as compared to that of User 2 in cases of C-NOMA and OMA.…”

Section: Simulation Resultsmentioning

confidence: 99%

Performance Analysis of Power-Splitting Relaying Protocol in SWIPT Based Cooperative NOMA Systems

Tran

Phan

Vien³

2020

Preprint

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This paper investigates a relay assisted simultaneous wireless information and power transfer (SWIPT) for downlink in cellular systems. Cooperative non-orthogonal multiple access (C-NOMA) is employed along with power splitting (PS) protocol to enable both energy harvesting (EH) and information processing (IP). A downlink model consisting of a base station (BS) and two users is considered, in which the near user (NU) is selected as a relay to forward the received signal from the BS to the far user (FU). Maximum ratio combining is then employed at the FU to combine both the signals received from the BS and NU. Closed form expressions of outage probability (OP), throughput, ergodic rate and energy efficiency (EE) are firstly derived for the SWIPT based C-NOMA considering both scenarios of having and without having direct link between the BS and FU. The impacts of EH time, EH efficiency, power-splitting ratio, source data rate and distance between different nodes on the performance are then investigated. The simulation results show that the C-NOMA with direct link achieves an outperformed performance over C-NOMA without direct link. Moreover, the performance of C-NOMA with direct link is also higher than that for OMA. Specifically, (i) the outage probability for C-NOMA in both direct and relaying link cases is always lower than that for OMA. (ii) the outage probability, throughput and ergodic rate vary according to b, (iii) the EE of both users can obtain in SNR range of from -10 to 5 dB and it decreases linearly as SNR increases. Numerical results are provided to verify the findings.

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Section: Simulation Resultsmentioning

confidence: 99%

Performance Analysis of Power-Splitting Relaying Protocol in SWIPT Based Cooperative NOMA Systems

Tran

Phan

Vien³

2020

Preprint

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“…Previous studies on the NOMA system used a cooperative relay to improve system performance compared to a direct transmission system. The contributions of previous studies [30][31][32] are the motivation for this research to continue to improve system performance.…”

Section: N − 1 Df Relaying Nodes Scenariomentioning

confidence: 99%

Multi-Points Cooperative Relay in NOMA System with N-1 DF Relaying Nodes in HD/FD Mode for N User Equipments with Energy Harvesting

Tran

Vozňák

2019

Electronics

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Non-Orthogonal Multiple Access (NOMA) is the key technology promised to be applied in next-generation networks in the near future. In this study, we propose a multi-points cooperative relay (MPCR) NOMA model instead of just using a relay as in previous studies. Based on the channel state information (CSI), the base station (BS) selects a closest user equipment (UE) and sends a superposed signal to this UE as a first relay node. We have assumed that there are N UEs in the network and the N-th UE, which is farthest from BS, has the poorest quality signal transmitted from the BS compared the other UEs. The N-th UE received a forwarded signal from N - 1 relaying nodes that are the UEs with better signal quality. At the i-th relaying node, it detects its own symbol by using successive interference cancellation (SIC) and will forward the superimposed signal to the next closest user, namely the ( i + 1 ) -th UE, and include an excess power which will use for energy harvesting (EH) intention at the next UE. By these, the farthest UE in network can be significantly improved. In addition, closed-form expressions of outage probability for users over both the Rayleigh and Nakagami-m fading channels are also presented. Analysis and simulation results performed by Matlab software, which are presented accurately and clearly, show that the effectiveness of our proposed model and this model will be consistent with the multi-access wireless network in the future.

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“…While the relay selection in overlay CR NOMA networks was investigated in [11], which have reliability-oriented and fairness-oriented schemes, it was derived the outage probabilities of PR and SR. More recently, the outage probabilities of the PR and SR in cooperative overlay CR NOMA network with channel errors and SIC errors are studied in [12]. Even though it is not a CR system, there was a study on considering the direct link for a NOMA system, but it does not include a relay selection [13].…”

Section: Introductionmentioning

confidence: 99%

“…International Journal of Intelligent Engineering and Systems, Vol. 13 In this paper, we proposed an overlay CR NOMA system with direct link and selection relay, which improves the performance of the PR and the SR. And the performance of the PR and the SR have been derived in closed-form and the analytical results were confirmed with the simulation. At the given condition, the performance of the PR with MRC is better than the PR with SC.…”

mentioning

confidence: 99%

Overlay Cognitive Radio NOMA Networks with Selected Relay and Direct Link

Kim¹

2020

IJIES

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In this paper, we propose an overlay cognitive radio (CR) non-orthogonal multiple access (NOMA) network to improve the performance of the primary receiver (PR) as well as the secondary receiver (SR). To accomplish the purpose, firstly, we adapt combining technology, selection combining (SC) and maximal ratio combining (MRC) which utilizing both signals from an indirect path and a direct path for the PR. Secondly, we select a relay which provides the spatial diversity gain among the candidate secondary sources (SSs) for the SR. The performance of the PR and the SR is derived in closed-form and verified through simulation. Numerical results demonstrate that the performance of the PR with SC or MRC always better than that of the PR of a conventional overlay CR NOMA system which receives from the indirect path only. Also, to maintain the same outage probability of the PR with MRC compared to that with SC at the given condition, 2 dB less transmit power is noticed. Furthermore, the performance of the SR with the selected relay improves with the increase of the number of the SSs. Consequently, we show that the proposed network, which assumes a direct link and adapts a selected relay, has better performance than the conventional overlay CR NOMA network.

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Decode-and-Forward Relaying for Cooperative NOMA Systems With Direct Links

Cited by 94 publications

References 42 publications

Performance Analysis of Power-Splitting Relaying Protocol in SWIPT Based Cooperative NOMA Systems

Performance Analysis of Power-Splitting Relaying Protocol in SWIPT Based Cooperative NOMA Systems

Multi-Points Cooperative Relay in NOMA System with N-1 DF Relaying Nodes in HD/FD Mode for N User Equipments with Energy Harvesting

Overlay Cognitive Radio NOMA Networks with Selected Relay and Direct Link

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