Underlay Cognitive NOMA-Based Coordinated Direct and Relay Transmission

Nguyen, Sang Quang; Vu, Thai-Hoc; Nguyen, Toan-Van; Costa, Daniel Benevides da; Ho, Chung Duc

doi:10.1109/lwc.2020.3046779

Cited by 34 publications

(26 citation statements)

References 11 publications

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“…Eventually, the incorporation of NOMA into CR, referred to as cognitive NOMA (CNOMA), has demonstrated a potential attribute of fulfilling the criteria of 5G wireless networks such as maximum throughput, broad connectivity, and low latency [14]. With the applicability of CNOMA, several research studies have been coordinated using the underlay [15]- [19] and overlay [20]- [25] approaches. Particularly, authors in [15] have investigated the outage performance of the large-scale underlay CNOMA network using stochastic geometry.…”

Section: A Literature Reviewmentioning

confidence: 99%

“…Various relay selection schemes have been explored in [18] for an underlay CNOMA system operating with multiple DF relays. A cooperative underlay CNOMA-based coordinated direct and relay transmission has been investigated in [19]. In contrast to the underlay CNOMA, authors in [20], [21] have studied the overlay CNOMA model which deputes the secondary transmitter (ST) to act as a relay for the PU and also allows it to communicate with its secondary receivers (SRs) using the NOMA principle.…”

Section: A Literature Reviewmentioning

confidence: 99%

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Performance Analysis of Energy Harvesting-Assisted Overlay Cognitive NOMA Systems With Incremental Relaying

Shukla

Singh

Upadhyay

et al. 2021

IEEE Open J. Commun. Soc.

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In this paper, we analyze the performance of an energy harvesting (EH)-assisted overlay cognitive non-orthogonal multiple access (NOMA) system. The underlying system consists of a primary transmitter-receiver pair accompanied by an energy-constrained secondary transmitter (ST) with its intended receiver. Accordingly, ST employs a time switching (TS) based receiver architecture to harvest energy from radio-frequency signals of the primary transmissions, and thereby uses this energy to relay the primary information and to transmit its own information simultaneously using the NOMA principle. For this, we propose two cooperative spectrum sharing (CSS) schemes based on incremental relaying (IR) protocol using amplify-and-forward (AF) and decode-and-forward (DF) strategies, viz., CSS-IAF and CSS-IDF, and compare their performance with the competitive fixed relaying based schemes. The proposed IR-based schemes adeptly avail the degrees-of-freedom to boost the system performance. Thereby, considering the realistic assumption of the NOMA-based imperfect successive interference cancellation, we derive the expressions of outage probability for the primary and secondary networks under both CSS-IAF and CSS-IDF schemes subject to the Nakagami-m fading. In addition, we quantify the throughput and energy efficiency for the considered system. The obtained theoretical findings are finally validated through numerous analytical and simulation results to reveal the advantages of the proposed CSS schemes over the baseline direct link transmission and orthogonal multiple access schemes.Index Terms-Amplify-and-forward, cognitive radio, decode-and-forward, energy harvesting, incremental relaying, non-orthogonal multiple access (NOMA), overlay spectrum sharing, simultaneous wireless information and power transfer (SWIPT).Recently, the NOMA technique has been commonly debated in the context of cognitive radio (CR), which is another potential This work is carried out under BRICS Multilateral R&D Project with No.

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Section: A Literature Reviewmentioning

confidence: 99%

Section: A Literature Reviewmentioning

confidence: 99%

Performance Analysis of Energy Harvesting-Assisted Overlay Cognitive NOMA Systems With Incremental Relaying

Shukla

Singh

Upadhyay

et al. 2021

IEEE Open J. Commun. Soc.

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“…1 are the first-order modified Bessel function in the zeroth-order, the Rician factor, and the normalized average fading power, respectively. Based on Equation (8.445) in [27], (7) can be rewritten by…”

Section: The Channel Modelmentioning

confidence: 99%

“…Downlink non-orthogonal multiple access (NOMA) enables multiuser communication with the same frequency, which improves bandwidth utilization based on the design of the communication resources [7,8]. A few recent works have investigated the performance improvement of UAV-enabled communications systems based on the use of NOMA.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of UAV-Based NOMA Networks with Hardware Impairment

Duc

Nguyen

et al. 2021

Electronics

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In this paper, we evaluate the outage performance of a non-orthogonal multiple access (NOMA)-enabled unmanned aerial vehicle (UAV) where two users on the ground are simultaneously served by a UAV for a spectral efficiency purpose. In practice, hardware impairments at the transceiver cause distortion noise, which results in the performance loss of wireless systems. As a consequence, hardware impairment is an unavoidable factor in the system design process. Hence, we take into account the effects of hardware impairment (HI) on the performance of the proposed system. In this setting, to evaluate the system performance, the closed-form expressions of the outage probability of two NOMA users and the ergodic capacity are derived as well as their asymptotic expressions for a high signal-to-noise ratio (SNR). Finally, based on Monte-Carlo simulations, we verify the analytical expressions and investigate the effects on the main system parameters, i.e., the transmit SNR and level of HI, on the system performance metrics. The results show that the performance for the near NOMA user is better than of that for the far NOMA user in the case of perfect hardware; however, in the case of hardware impairment, an inversion happens at a high transmit power of the UAV in terms of the ergodic capacity.

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“…In multi-relay networks, relay selection is a low-complexity approach that can achieve the cooperative NOMA and opportunistic relay transmission [26]. Different from the above research, authors in [27,28] considered the coexistence of direct link and relay-cooperative links between the far user and base station, in which relays existed to compensate for the reduction of reliability and coverage of cognitive networks due to power constraints. However, user cooperation is not considered in [23][24][25]27,28].…”

Section: Introductionmentioning

confidence: 99%

Two-Stage Adaptive Relay Selection and Power Allocation Strategy for Cooperative CR-NOMA Networks in Underlay Spectrum Sharing

Liang

Pla

et al. 2021

Applied Sciences

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In this paper, we consider a novel cooperative underlay cognitive radio network based on non-orthogonal multiple access (CR-NOMA) with adaptive relay selection and power allocation. In secondary networks, dedicated relay assistance and user assistance are used to achieve communication between the base station and the far (and near) user. Here, a two-stage adaptive relay selection and power allocation strategy is proposed to maximize the achievable data rate of the far user while ensuring the service quality of near user. Furthermore, the closed-form expressions of outage probability of two secondary users are derived, respectively, under interference power constraints, revealing the impact of transmit power, number of relays, interference threshold and target data rate on system outage probability. Numerical results and simulations validate the advantages of the established cooperation and show that the proposed adaptive relay selection and power allocation strategy has better outage performance.

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Underlay Cognitive NOMA-Based Coordinated Direct and Relay Transmission

Cited by 34 publications

References 11 publications

Performance Analysis of Energy Harvesting-Assisted Overlay Cognitive NOMA Systems With Incremental Relaying

Performance Analysis of Energy Harvesting-Assisted Overlay Cognitive NOMA Systems With Incremental Relaying

Performance Evaluation of UAV-Based NOMA Networks with Hardware Impairment

Two-Stage Adaptive Relay Selection and Power Allocation Strategy for Cooperative CR-NOMA Networks in Underlay Spectrum Sharing

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