Opportunistic Adaptive Non-Orthogonal Multiple Access in Multiuser Wireless Systems: Probabilistic User Scheduling and Performance Analysis

Yang, Long; Jiang, Hai; Ye, Qiang; Ding, Zhiguo; Fang, Fang; Shi, Jia; Chen, Jian; Xue, Xuan

doi:10.1109/twc.2020.2999814

Cited by 16 publications

(11 citation statements)

References 35 publications

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“…In addition, both satellite and terrestrial nodes apply multiple antennas and all terrestrial nodes are located in the same satellite beam, while omnidirectional antenna is equipped at B due to power constraint (it is assumed that perfect CSI can be achieved through feedback and training, and it has been adopted in DVE-S2). Moreover, the K primary users are divided into K/2 twouser pairs, which have been adopted in many former works [33,40] (too many users will lead to heavy interference or high receiver complexity, so this paper adopts two-user pair scheme to balance performance gain and communication cost). us, we assume C 1 and C 2 are assigned to the same pair.…”

Section: System Model and Problem Formulationmentioning

confidence: 99%

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NOMA-Based Overlay Cognitive Satellite-UAV-Terrestrial Networks with Multiple Primary Users

Liu

Guo

et al. 2022

Wireless Communications and Mobile Computing

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Satellite communication is becoming more and more significant in present and future communication systems for its unique advantages of strong survivability and seamless coverage, which can offset the defects of terrestrial communication such as being restricted by terrain and little coverage. Moreover, unmanned aerial vehicle (UAV)-assisted communication is considered as a promising development direction due to its flexibility and expansibility in the integrated satellite-terrestrial networks (ISTN). In addition, to overcome the spectrum shortage and low spectrum utilization problems, cognitive radio and nonorthogonal multiple access (NOMA) has been widely utilized to enhance spectrum efficiency, which is considered as the key technologies of the next generation communication. In this regard, our paper investigates the performance of cognitive satellite-UAV-terrestrial networks with NOMA scheme and multiple primary users. Specifically, the exact expressions of outage probability (OP) and ergodic capacity for both primary network and secondary network are derived. To gain further views, the asymptotic expression of OP and diversity orders for the two networks are provided. Finally, through numerical simulations, the correctness of the theoretical derivations is verified and the influences of critical variables on system indexes are also analyzed.

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Section: System Model and Problem Formulationmentioning

confidence: 99%

“…In ISTN, the utilization of NOMA is able to save valuable time/frequency/code resources by sacrificing a little complexity of the receivers [33][34][35]. In [35], the authors applied bandwidth compression (BC) in NOMA-based ISTN to enhance spectrum utilization.…”

Section: Introductionmentioning

confidence: 99%

NOMA-Based Overlay Cognitive Satellite-UAV-Terrestrial Networks with Multiple Primary Users

Liu

Guo

et al. 2022

Wireless Communications and Mobile Computing

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“…In [10] and [11], co-channel interference is included and the ABEP is derived considering binary-phase-shift-keying (BPSK) modulation and squarequadrature-amplitude-modulations (S-QAM), respectively. In [17], OpT is used in a power-domain non-orthogonal multiple access (NOMA) system to reduce the interference levels in Rayleigh fading channels. An scheduling is performed based on the fading amplitude.…”

Section: Introductionmentioning

confidence: 99%

On the Bit Error Probability and the Spectral Efficiency of Opportunistic Wireless Transmissions in Rician Fading Channels

et al. 2021

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Opportunistic systems take advantage of the wireless communication channel random behavior, since transmission is made only when fading amplitude is above a threshold value, which is calculated based on a transmission probability. This type of transmission draws attention because improves the system performance, and it is an interesting scheme for primary users in cognitive radio networks or is also an option for physical layer security. In this paper, we analyze the performance of opportunistic transmissions in Rician fading channels considering square-quadrature-amplitude-modulation (S-QAM) and nonsquare-quadrature-amplitude-modulation (NS-QAM). Exact closed-form expressions and approximations are derived to evaluate the average bit error probability (ABEP). An expression to calculate the mean spectral efficiency (SE) is also derived considering that a target ABEP must be guaranteed. The SE is calculated using the coverage radius obtained for each modulation used in the system. Hence, an algorithm for the radii calculation is also presented, which considers that the parameters of the Rician fading channel change in the cellular area. The results show that opportunistic transmission (OpT) mitigates the fading effects once the ABEP decays exponentially as the signal to noise ratio (SNR) is increased. Additionally, the proposed algorithm, along with the derived expressions, determine the scenarios where the SE is maximized. INDEX TERMS Opportunistic system, Rician fading channel, modulations, bit error probability, spectral efficiency.

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“…Relay cooperative communication techniques have been introduced to NOMA in [ 8 , 9 , 10 , 11 ]. Some suboptimal power allocation strategies are proposed and system performance, e.g., OP and achievable average rate, is analyzed in the cooperative relay NOMA system [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…Some suboptimal power allocation strategies are proposed and system performance, e.g., OP and achievable average rate, is analyzed in the cooperative relay NOMA system [ 8 , 9 ]. The work [ 10 ] adopts user pairing selection opportunistically to operate in direct NOMA mode or cooperative NOMA mode to guarantee transmission reliability and fairness. Additionally, an adaptive switching approach between OMA mode and cooperative NOMA mode is realized to improve the far-end node’s performance in [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Time Switching Based Wireless Powered Relay Transmission with Uplink NOMA

Zhou

Cao

2021

Sensors

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Non-orthogonal multiple access (NOMA) utilizes power domain multiplexing to improve spectrum efficiency compared with orthogonal multiple access (OMA). In the Internet of Things (IoT) uplink NOMA networks, if the channel between the far-end node and the base station is in deep fading, allocating larger transmitting power for this node cannot achieve higher spectrum efficiency and overall system throughput. Relay cooperative communication reduces the transmitting power at the far-end node but leads to extra energy expenditure at the relay node. Fortunately, simultaneous wireless information and power transfer (SWIPT) is advocated in energy-constrained IoT networks to save energy consumption. However, early works all focus on energy harvesting (EH) from one source node or one dedicated power supply station. In this paper, we propose a time switching based wireless powered relay transmission model with uplink NOMA where our EH technique can harvest energy from two simultaneously transmitting nodes. More importantly, by optimizing relay position more energy is harvested from the near-end node at the relay and relay signal attenuation to the destination is reduced as well. Furthermore, the closed-form expressions of outage probability and overall system throughput are derived, and numerical results prove that NOMA in our EH scheme achieves better performance compared to the traditional EH scheme and OMA by optimizing the position of the relay node, time switching factor and so on.

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Opportunistic Adaptive Non-Orthogonal Multiple Access in Multiuser Wireless Systems: Probabilistic User Scheduling and Performance Analysis

Abstract: Xue, Xuan (2020) 'Opportunistic adaptive non-orthogonal multiple access in multiuser wireless systems : probabilistic user scheduling and performance analysis.', IEEE transactions on wireless communications., 19 (9). pp. 6065-6082.

Cited by 16 publications

References 35 publications

NOMA-Based Overlay Cognitive Satellite-UAV-Terrestrial Networks with Multiple Primary Users

NOMA-Based Overlay Cognitive Satellite-UAV-Terrestrial Networks with Multiple Primary Users

On the Bit Error Probability and the Spectral Efficiency of Opportunistic Wireless Transmissions in Rician Fading Channels

Time Switching Based Wireless Powered Relay Transmission with Uplink NOMA

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