A Unified Framework for HS-UAV NOMA Networks: Performance Analysis and Location Optimization

Li, Xingwang; Wang, Qunshu; Peng, Hongxing; Zhang, Hui; Do, Dinh‐Thuan; Rabie, Khaled M.; Kharel, Rupak; Cavalcante, Charles C.

doi:10.1109/access.2020.2964730

Cited by 64 publications

(38 citation statements)

References 31 publications

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“…latency [1]- [5]. In addition, the non-orthogonal resource allocation is explored in NOMA to implement emerging networks such as satellite hybrid relaying network, unmanned aerial vehicle [6]. The challenging models are developed by the authors in [7]- [9], in which combination between relay schemes and NOMA is introduced as novel scheme, namely cooperative NOMA.…”

Section: Introductionmentioning

confidence: 99%

NOMA in Cooperative Underlay Cognitive Radio Networks Under Imperfect SIC

Lee

2020

IEEE Access

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113

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In conventional cognitive radio (CR), the users in secondary network (SN) can only access the idle spectrum when users in primary network (PN) are absent. This novel strategy provides higher spectrum efficiency when detecting the presence of the PN. Hence, spectrum utilization of the traditional scheme can be further improved as exploiting application of non-orthogonal multiple access (NOMA). As combination of CR and NOMA, such CR-NOMA has been proposed to improve spectrum efficiency to adapt to requirements in 5G communications. In this study, the relaying scheme is employed in the SN of the proposed CR-NOMA and the relay is allowed to energy harvesting (EH) from the secondary transmitter to serve signal forwarding to distant secondary users. With this regard, the complex model of EH-assisted CR-NOMA is explored in outage behavior and throughput performance as awareness on imperfect successive interference cancellation (SIC) at the receiver. As most important results, the exact closed-form of the exact outage probability is derived for each NOMA destination by assuming that the channel coefficients among considered links follow Rayleigh distribution. Furthermore, performance gap between two NOMA users can be controlled by various parameters such as transmit power, energy harvesting coefficients and levels of imperfect SIC. Simulation results verify our analytical results. INDEX TERMS Energy harvesting, imperfect SIC, NOMA, outage probability, underlay cognitive radio.

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Section: Introductionmentioning

confidence: 99%

NOMA in Cooperative Underlay Cognitive Radio Networks Under Imperfect SIC

Lee

2020

IEEE Access

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113

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“…We have obtain the outage probability of D 2 for AF-based ICN system as shown in (21), which can be rewritten as P ICN 2,AF = Pr γ 2 < γ th2 ð Þ P r γ AF 2 < γ th2 ′ : ðC:1Þ…”

Section: Proof Of Remarkmentioning

confidence: 99%

“…Additionally, the performance of the cooperative NOMA system with dedicated DF relay has been researched by evaluating outage probability and sum rate over Nakagamim fading [20]. The authors of [21] have researched a unified framework for hybrid satellite/unmanned aerial vehicle (UAV) terrestrial NOMA networks, where satellite communicated with ground users with the aid of a DF-UAV relay. In [22], the CSI was available in the cooperative NOMA system to determine the decoding order of cell-edge users data, where the outage behaviors have been analyzed under considering DF and AF relaying protocols.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Cooperative NOMA Systems with Incremental Relaying

Wang

Peng

Pei

et al. 2020

Wireless Communications and Mobile Computing

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In this paper, we investigate the performance of the non-orthogonal multiple access (NOMA) system with incremental relaying, where the relay is employed with amplify-and-forward (AF) or decode-and-forward (DF) protocols. To characterize the outage behaviors of the incremental cooperative NOMA (ICN) system, new closed-form expressions of both exact and asymptotic outage probability for two users are derived. In addition, the performance of the conventional cooperative NOMA (CCN) system is analyzed as a benchmark for the the purpose of comparison. We confirm that the outage performance of the distant user is enhanced when ICN system is employed. Numerical results are presented to demonstrate that (1) the near user of the ICN system achieves better outage behavior than that of the CCN system in the low signal-to-noise ratio (SNR) region; (2) the outage performance of distant user for the DF-based ICN system is superior to that of the AF-based ICN system when the system works in cooperative NOMA transmission mode; and (3) in the low SNR, the throughput of the ICN system is higher than that of the CCN system. authors of [9] have researched the performance of a downlink single-cell NOMA network when assuming imperfect channel state information (CSI) and second-order statistics. Furthermore, the authors in [10] consider the scenario that each user only feedback one bit of its CSI to a base station (BS) and analyzed the outage performance. Apart from these researches, there are a lot of studies on improving the secrecy performance of multiple users [11,12], where the external and internal eavesdropping scenarios have been considered. Up to now, NOMA has been extended to cooperative communication systems [13, 14], as the higher diversity and extended coverage can be obtained in wireless networks. The authors have analyzed the outage performance of NOMA system with decode and forward (DF) relay employing full-duplex (FD) and half-duplex (HD) mode, where the near user was selected as a relay to deliver information and improve transmission reliability of distance users [15]. Inspired by this, simultaneous wireless information and

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“…The work in [ 15 ] studied the CR-NOMA system based on energy harvesting assistance and analyzed the impact of the receiver’s imperfect successive interference cancellation on outage behavior and throughput performance. The authors in [ 16 ] studied the NOMA system throughput and the optimal position optimization of the UAV in the delay-constrained transmission mode. The work in [ 17 ] introduced the NOMA scheme into a multi-beam satellite system and proposed a scheduling strategy to enhance system performance.…”

Section: Introductionmentioning

confidence: 99%

Performance Optimization of Hybrid Satellite-Terrestrial Relay Network Based on CR-NOMA

Zhao

Liang

2020

Sensors

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The non-orthogonal multiple access (NOMA) scheme realizes the transmission of multiple user signals at the same time and frequency resource block through power domain multiplexing, which improves the system transmission rate and user fairness. In this paper, we propose a joint relay-and-antenna selection scheme based on the cognitive radio scenario. This scheme can achieve the maximum communication rate of the secondary user when the primary user maintains the optimal outage performance. In the considered system both terrestrial relays and users are deployed with multi-antenna configurations and the terrestrial relays adopt the decode-and-forward (DF) strategy to achieve communication between satellites and users. Then, we derive the exact outage probability expression of each user in the system and the asymptotic probability expression under high signal-to-noise ratio (SNR). Numeric results demonstrate that increasing the number of relays and antennas on the terrestrial nodes can both improve system outage performance. Moreover, the number of relays imposes a more obvious effect on the achievable system performance.

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A Unified Framework for HS-UAV NOMA Networks: Performance Analysis and Location Optimization

Cited by 64 publications

References 31 publications

NOMA in Cooperative Underlay Cognitive Radio Networks Under Imperfect SIC

NOMA in Cooperative Underlay Cognitive Radio Networks Under Imperfect SIC

Performance Analysis of Cooperative NOMA Systems with Incremental Relaying

Performance Optimization of Hybrid Satellite-Terrestrial Relay Network Based on CR-NOMA

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