On the Performance of Downlink NOMA in Underlay Spectrum Sharing

Kumar, Vaibhav; Ding, Zhiguo; Flanagan, Mark F.

doi:10.1109/tvt.2021.3069440

“…Moreover, Yue et al and Lei et al studied the downlink NOMA systems in terms of the relationship between reliability and security [17], [18]. The authors in [19] presented the performance analysis of a downlink underlay CR-NOMA system, where closed-form expressions for the outage probability and average achievable sum-rate of the SUs were derived considering various scenarios of the CSI availability.…”

Section: Related Workmentioning

confidence: 99%

Hardware and Interference Limited Cooperative CR-NOMA Networks Under Imperfect SIC and CSI

Arzykulov

¹

,

Nauryzbayev

²

,

Çelik

³

et al. 2021

IEEE Open J. Commun. Soc.

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The conflation of cognitive radio (CR) and non-orthogonal multiple access (NOMA) concepts is a promising approach to fulfill the massive connectivity goals of future networks given the spectrum scarcity. Accordingly, this paper investigates the performance of a cooperative CR-NOMA network in the presence of system impairments and interference. Our analysis is involved with the derivation of the end-to-end outage probability for primary and secondary networks by accounting for channel state information (CSI), hardware imperfections, and residual interference caused by successive interference cancellation errors as well as coexisting primary/secondary users. Moreover, a mathematically tractable upper bound on spectral efficiency (SE) with its high-SNR approximations are derived. Besides, we propose an optimal power allocation scheme for CR-NOMA users to guarantee their outage and SE fairness. The numerical results validated by Monte Carlo simulations show that the CR-NOMA network provides a superior outage performance over orthogonal multiple access. Furthermore, the higher level of system imperfections leads to the performance degradation of the CR-NOMA networks. As imperfections become more severe, the CR-NOMA is observed to deliver relatively inferior outage and SE performance as compared to the perfect system scenario.

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“…( 7), ( 10), ( 11), (21), and ( 22)]. On the other hand, the analytical expression for the ER of the weak user will be the same as given by (10). The sum ER, R sum = R s + R w , is then obtained by combining ( 11) and (10).…”

Section: Case S-s: Statistical Il-csi and Statistical Sl-csimentioning

confidence: 99%

On the Effective Rate of NOMA in Underlay Spectrum Sharing

Kumar

¹

,

Ding

²

,

Flanagan

³

2021

IEEE Trans. Veh. Technol.

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3

0

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In this paper, we present the delay-constrained performance analysis of a multi-antenna-assisted multiuser nonorthogonal multiple access (NOMA) based spectrum sharing system over Rayleigh fading channels. We derive analytical expressions for the sum effective rate (ER) for the downlink NOMA system under a peak interference constraint. In particular, we show the effect of the availability of different levels of channel state information (instantaneous and statistical) on the system performance. We also show the effect of different parameters of interest, including the peak tolerable interference power, the delay exponent, the number of antennas and the number of users, on the sum ER of the system under consideration. An excellent agreement between simulation and theoretical results confirms the accuracy of the analysis. I. INTRODUCTIONW ITH an explosive growth in the number of wireless communication devices and users, along with an unprecedented growth in internet traffic, one of the major challenges for the development of beyond-fifth-generation (B5G) systems is to accommodate a massive number of devices into a congested spectrum. Moreover, with the development of new wireless services, there is a new wave of applications which are extremely delay sensitive. Such applications include live video streaming, online gaming, vehicle-to-everything (V2X) communications and tactile Internet. NOMA and spectrum sharing are two major technologies that can mitigate the problem of spectrum scarcity while also providing massive connectivity with low latency. It is well-known that NOMA facilitates spectrum sharing and can also enhance the secrecy performance of unmanned aerial vehicle (UAV) aided simultaneous wireless information and power transfer (SWIPT) [1] as well as that of the primary/licensed network [2].The average achievable rate is one of the commonly used metrics to evaluate the performance of a wireless communication system. However, it is important to note that this metric is based on Shannon's channel capacity formula, which does not take into account the queuing delay at the transmitter. In order to quantify the delay-constrained performance of a wireless communications system, the concept of effective rate (also known as effective capacity 1 or link-layer capacity)

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“…( 7), ( 10), ( 11), (21), and ( 22)]. On the other hand, the analytical expression for the ER of the weak user will be the same as given by (10). The sum ER, R sum = R s + R w , is then obtained by combining ( 11) and (10).…”

Section: Case S-s: Statistical Il-csi and Statistical Sl-csimentioning

confidence: 99%

On the Effective Rate of NOMA in Underlay Spectrum Sharing

Kumar¹,

Ding²,

Flanagan³

2021

Preprint

Self Cite

0

View full text Add to dashboard Cite

In this paper, we present the delay-constrained performance analysis of a multi-antenna-assisted multiuser nonorthogonal multiple access (NOMA) based spectrum sharing system over Rayleigh fading channels. We derive analytical expressions for the sum effective rate (ER) for the downlink NOMA system under a peak interference constraint. In particular, we show the effect of the availability of different levels of channel state information (instantaneous and statistical) on the system performance. We also show the effect of different parameters of interest, including the peak tolerable interference power, the delay exponent, the number of antennas and the number of users, on the sum ER of the system under consideration. An excellent agreement between simulation and theoretical results confirms the accuracy of the analysis.

show abstract

On the Performance of Downlink NOMA in Underlay Spectrum Sharing

Cited by 30 publications

References 20 publications

Hardware and Interference Limited Cooperative CR-NOMA Networks Under Imperfect SIC and CSI

Hardware and Interference Limited Cooperative CR-NOMA Networks Under Imperfect SIC and CSI

On the Effective Rate of NOMA in Underlay Spectrum Sharing

On the Effective Rate of NOMA in Underlay Spectrum Sharing

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