Improving the Performance of Cell-Edge Users in NOMA Systems Using Cooperative Relaying

Nhu, Tri; Costa, Daniel Benevides da; Duong, Trung Q.; An, Beongku

doi:10.1109/tcomm.2018.2796611

Cited by 123 publications

(68 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where L is the reference signal power attenuation, XY denotes the distance between X and Y, 0 presents the reference distance, and is the path-loss exponent [33]. And the channel noise is followed by Y ∼ CN(0, 2 Y ).…”

Section: System Modelmentioning

confidence: 99%

“…where = / , = cos(((2 − 1)/2 ) ), and is the number of terms, respectively. Plugging (33) into (34), and after some manipulations, eventually, the tight approximated closed-form expression for SOP of the selected far user can be obtained as…”

Section: The Cumulative Distribution Function (Cdf) and Probability Dmentioning

confidence: 99%

“…complex Gaussian random variable with zero mean and variance XY . Thus, the corresponding channel gain, |ℎ XY | 2 , is an exponential random variable with probability density function (PDF), [32][33][34]. More specifically, the average channel gain can be written as…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Exploiting Opportunistic Scheduling for Physical‐Layer Security in Multitwo User NOMA Networks

Shim

2018

Wireless Communications and Mobile Computing

Self Cite

View full text Add to dashboard Cite

In this paper, we address the opportunistic scheduling in multitwo user NOMA system consisting of one base station, multinear user, multifar user, and one eavesdropper. To improve the secrecy performance, we propose the users selection scheme, called best-secure-near-user best-secure-far-user (BSNBSF) scheme. The BSNBSF scheme aims to select the best near-far user pair, whose data transmission is the most robust against the overhearing of an eavesdropper. In order to facilitate the performance analysis of the BSNBSF scheme in terms of secrecy outage performance, we derive the exact closed-form expression for secrecy outage probability (SOP) of the selected near user and the tight approximated closed-form expression for SOP of the selected far user, respectively. Additionally, we propose the descent-based search method to find the optimal values of the power allocation coefficients that can minimize the total secrecy outage probability (TSOP). The developed analyses are corroborated through Monte Carlo simulation. Comparisons with the random-near-user random-far-user (RNRF) scheme are performed and show that the proposed scheme significantly improves the secrecy performance.

show abstract

Section: System Modelmentioning

confidence: 99%

Section: The Cumulative Distribution Function (Cdf) and Probability Dmentioning

confidence: 99%

See 1 more Smart Citation

Exploiting Opportunistic Scheduling for Physical‐Layer Security in Multitwo User NOMA Networks

Shim

2018

Wireless Communications and Mobile Computing

Self Cite

View full text Add to dashboard Cite

show abstract

“…NOMA was extended to a cooperative scenarios in [13], where users under good channel conditions can be used as relays for other users under poorer channel conditions. Unlike cooperative NOMA [13], a cooperative relay system employing the NOMA scheme to improve the spectral efficiency was proposed in [21,22]. Very recently, a cooperative NOMA with SWIPT has been studied, where NOMA users located near the source act as energy harvesting relays to help further away NOMA users [14].…”

Section: Noma With Prsmentioning

confidence: 99%

Cooperative Non-Orthogonal Multiple Access for Future Wireless Communications

Lee¹

2018

EAI Endorsed Transactions on Industrial Networks and Intelligen

View full text Add to dashboard Cite

There is a huge demand for increased connectivity and reliability of devices in the fifth generation and beyond of wireless communications so as to ensure massive connectivity and high spectral efficiency. Recently, powerdomain non-orthogonal multiple access (NOMA) has received considerable attention as a promising multiple access scheme to improve spectrum efficiency. It allows multiple users to share both time and frequency resources by adjusting the power allocation ratio. However, with ever-increasing mobile users and machines in future wireless environments, NOMA still suffers from some challenges such as a limited connectivity, channel uncertainty and a trade-off between throughput and user fairness. Therefore, an opportunity exists for developing NOMA features in a cooperation of such devices. In this paper, we focuses on exploring cooperative power-domain NOMA systems to maximize potential and develops an effective multiple access for next generation wireless systems. To explore the trade-off of the cooperative NOMA system between its performance and the network complexity, several NOMA systems along with various techniques are introduced. Firstly, a joint NOMA and partial relay selection is introduced to improve both system throughput and user fairness. Secondly, a cooperative NOMA scheme which uses a cognitive radio network as an underlay is also introduced. In this work, a cooperative scheme is used to enhance the outage performance at a cell-edge user for user fairness and NOMA aims to improve spectral efficiency. Finally, an opportunistic NOMA under unreliable wireless backhauls and fronthaul channel uncertainty is introduced and two opportunistic selection rules are applied to a joint NOMA scheme and cooperated transmission. In this work, the impact of unreliable wireless backhauls and fronthaul channel uncertainty on the coordinated NOMA system is examined.

show abstract

“…Recently, to improve the transmission reliability, cooperative NOMA schemes with relay have been widely studied [9], [10], especially for users with long distance or poor channel condition [11]- [17]. In [11], Zhang et al utilized the near user served as the cooperative full-duplex (FD) relay to forward message for the far user in a downlink NOMA system, and the outage probability and ergodic sum rate were derived.…”

mentioning

confidence: 99%

Secrecy Analysis for Cooperative NOMA Networks With Multi-Antenna Full-Duplex Relay

Cao

Zhao

Pan

et al. 2019

IEEE Trans. Commun.

View full text Add to dashboard Cite

Improving the Performance of Cell-Edge Users in NOMA Systems Using Cooperative Relaying

Cited by 123 publications

References 27 publications

Exploiting Opportunistic Scheduling for Physical‐Layer Security in Multitwo User NOMA Networks

Exploiting Opportunistic Scheduling for Physical‐Layer Security in Multitwo User NOMA Networks

Cooperative Non-Orthogonal Multiple Access for Future Wireless Communications

Secrecy Analysis for Cooperative NOMA Networks With Multi-Antenna Full-Duplex Relay

Contact Info

Product

Resources

About