Cooperative Relaying Based Non-Orthogonal Multiple Access (NOMA) With Relay Selection

Yu, Zhiyuan; Zhai, Chao; Liu, Ju; Xu, Hongji

doi:10.1109/tvt.2018.2872828

Cited by 41 publications

(30 citation statements)

References 41 publications

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“…The relay aids communication between the source and two users (near and far users) due to the high signal attenuation of the direct link. This is in contrast to the system model studied in References [21,24], where a direct link exists between the source and the near user. We study the system model under a log-normal fading assumption with impulsive noise characteristic to PLC networks [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 75%

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

2019

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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.

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Section: Introductionmentioning

confidence: 75%

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

2019

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“…The above approximation is obtained by replacing w = Γ in Finally, the unconditional PDF of Γ 3 b is obtained by averaging (36) over (21) which gives:…”

Section: Methodsmentioning

confidence: 99%

“…Through outage analysis, the authors showed that deploying more relays enhanced the performance gain and proper selection of power allocation factor improved the ergodic capacity of weak user. Throughput analysis of two-phase cooperative NOMA system with relay selection was performed in [21]. A decodable relay was selected to forward the far user's signal and it was verified that cooperative NOMA with relay selection achieved higher system throughput than non-cooperative NOMA and conventional OMA networks.…”

Section: A Related Workmentioning

confidence: 97%

“…Besides cognitive radio technique, NOMA being the latest technology trend is promising to realize the aggressive 5G goal through multiplexing multiple users in power domain over the same resource block (frequency/time/code). Conventional mobile networks have been relying on OMA techniques that follow the principle of user orthogonality in frequency/time/code domain and enable single user in each resource block [9]- [10]. The disjoint resource allocation in OMA minimizes inter-user interference however does not hold the spectral efficiency required to support the demands of future generation networks.…”

Section: Introductionmentioning

confidence: 99%

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Best Relay Selection Schemes for NOMA Based Cognitive Relay Networks in Underlay Spectrum Sharing

Sultan

2020

IEEE Access

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Cognitive Radio and the emerging Non-Orthogonal Multiple Access (NOMA) techniques hold the potential to fulfill the increasing demands of radio spectrum by 5G-and-B5G wireless systems. It is a usual practice in underlay cognitive radio networks to take assistance from intermediate relays to reach the remote destination. Putting together, NOMA based Cognitive Relay Networks (NCRNs) have recently gained tremendous research attention to improve the spectrum utilization efficiency. This article studies the application of best relay selection (BRS) in downlink scenario of NCRNs in which a base station (BS) being unable to communicate directly with the far user U 2 takes assistance from the near user U 1 and from the best Decode-and-Forward (DF) relay selected from the potential NCRN operating in underlay environment. Three BRS schemes are proposed selecting a relay which (i) maximizes signal-to-noise ratio (SNR) on relay-U 2 link, (ii) minimizes interference on relay-primary user (PU) link, (iii) maximizes the quotient of relay-U 2 link's SNR and relay-PU link's interference power. Scheme 3 considers the existence of U 1 − U 2 link as well whereas the other two schemes do not. To characterize the performance of the proposed schemes assuming Rayleigh channel model, closed-form expressions of probability distribution function (PDF) of received SNR at U 2 , average number of reliable relays, outage probability and bit error rate are obtained. For insight analysis, analytical results are validated through simulations which reveal that relay selection in NCRNs is different from non-cognitive networks and is feasible in low-to-medium SNR regions. The signal from near user further improved the outage performance.

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“…Later, the key features, opportunities, and challenges of this kind of cooperative NOMA networks are reviewed and summarized in [14]. The authors in [15]- [18] considered the relay selection problem in NOMA-based relay networks, while those in [19]- [22] examined the related power-allocation problem. In practice, both problems are of great importance since the relay location and power allocation both have a significant effect on the NOMA/relaying behavior, and thus also impact the overall performance of the network.…”

Section: Introductionmentioning

confidence: 99%

Joint Power Allocation for NOMA-Based Diamond Relay Networks With and Without Cooperation

Huang

Lee

Sou

2020

IEEE Open J. Commun. Soc.

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Non-orthogonal multiple access (NOMA)-based diamond relaying (NDR) is an efficient approach for combining NOMA and relaying techniques in such a way as to enhance the achievable rate from the source to the destination in the network. This paper examines the problem of joint power allocation among all the transmission phases during the operation of such networks. Based on the Karush-Kuhn-Tucker (KKT) condition and the second-order sufficient condition (SOSC), at least the local optimal solution is derived and analyzed. In addition, a new protocol for NDR networks based on cooperative communications is introduced and the associated joint power-allocation problem is examined. It is shown that this cooperative NDR (C-NDR) network further improves the achievable rate in some typical placements of the relays. Simulation results verify the correctness of the deviation and confirm the effectiveness of the proposed joint power-allocation method for both NDR and C-NDR networks. INDEX TERMS Non-orthogonal multiple access (NOMA), relay networks, NOMA-based diamond relaying (NDR), cooperative communications, Karush-Kuhn-Tucker (KKT) condition, second-order sufficient condition (SOSC), joint power allocation, achievable rate.

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Cooperative Relaying Based Non-Orthogonal Multiple Access (NOMA) With Relay Selection

Cited by 41 publications

References 41 publications

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

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

Best Relay Selection Schemes for NOMA Based Cognitive Relay Networks in Underlay Spectrum Sharing

Joint Power Allocation for NOMA-Based Diamond Relay Networks With and Without Cooperation

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