Non-Orthogonal Multiple Access: A Unified Perspective

Wang, Qi; Zhang, Rong; Yang, Lie‐Liang; Hanzo, Lajos

doi:10.1109/mwc.2018.1700070

Cited by 82 publications

(39 citation statements)

References 14 publications

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“…7 plots the SOP of a pair of NOMA users (the n-th user and the m-th user) versus the transmit SNR, where ρ e = 10 dB, λ e = 10 −3 , K = 2 and ̟= 1. The exact analytical curves of SOP for CD/PD-NOMA networks are plotted based on (25) and (26), respectively. It can be seen that simulation results well match the theoretical results perfectly.…”

Section: A External Eavesdropping Scenariomentioning

confidence: 99%

Secure Communications in a Unified Non-Orthogonal Multiple Access Framework

Yue

Liu

Yao

et al. 2020

IEEE Trans. Wireless Commun.

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This paper investigates the impact of physical layer secrecy on the performance of a unified non-orthogonal multiple access (NOMA) framework, where both external and internal eavesdropping scenarios are examined. The spatial locations of legitimate users (LUs) and eavesdroppers are modeled by invoking stochastic geometry. To characterize the security performance, new exact and asymptotic expressions of secrecy outage probability (SOP) are derived for both code-domain NOMA (CD-NOMA) and power-domain NOMA (PD-NOMA), in which imperfect successive interference cancellation (ipSIC) and perfect SIC (pSIC) are taken into account. For the external eavesdropping scenario, the secrecy diversity orders by a pair of LUs (the n-th user and m-th user) for CD/PD-NOMA are obtained. Analytical results make known that the diversity orders of the n-th user with ipSIC/pSIC for CD-NOMA and PD-NOMA are equal to zero/K and zero/one, respectively. The diversity orders of the m-th user are equal to K/one for CD/PD-NOMA. For the internal eavesdropping scenario, we examine the analysis of secrecy diversity order and observe that the m-th user to wiretap the n-th user with ipSIC/pSIC for CD-NOMA and PD-NOMA provide the diversity orders of zero/K and zero/one, respectively, which is consistent with external eavesdropping scenario. Numerical results are present to confirm the accuracy of the analytical results developed and show that: i) The secrecy outage behavior of the n-th user is superior to that of the m-th user; ii) By increasing the number of subcarriers, CD-NOMA is capable of achieving a larger secrecy diversity gain compared to PD-NOMA.

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Section: A External Eavesdropping Scenariomentioning

confidence: 99%

Secure Communications in a Unified Non-Orthogonal Multiple Access Framework

Yue

Liu

Yao

et al. 2020

IEEE Trans. Wireless Commun.

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“…Thus, long-term fairness is ensured to all the network terminals. The long-term average spectral efficiency of any user is therefore a fraction 1/K of the aggregate spectral efficiency (7). Moreover, the normalized throughput, which is a traditional performance metric in the random access literature, is given by the product of (7) and the constant factor 1/(R c ↵).…”

Section: Problem Statementmentioning

confidence: 99%

Decentralized Random Energy Allocation for Massive Non-Orthogonal Code-Division Multiple Access

et al. 2019

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This work studies the spectral efficiency achievable when a very large number of terminals are connected simultaneously to a central node (uplink) through independent and identically-distributed flat-fading channels. Assuming that terminals only have statistical channel state information (CSI), the optimum random transmitted-energy allocation is formulated considering a non-orthogonal direct-sequence codedivision multiple access (DS-CDMA) where all users transmit using the same modulation and error correcting code and the receiver implements successive interference cancellation (SIC). Focusing on low-power terminals, optimization is carried out by imposing constraints on both the average and peak peruser transmitted energy. Simulations have revealed that a limited number of random energy levels, whose number is determined by the channel power gain variance, is sufficient to achieve approximately the maximum spectral efficiency that would be obtained under direct optimization of the received energy profile.

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“…Compared to OMA, NOMA can exploit the channel diversity more efficiently via smart interference management techniques such as successive interference cancellation (SIC) [3], thus, achieving the performance enhancements. A unified framework for NOMA is provided in [4] where the authors review the principles of various NOMA schemes in different domains. As one of the dominant NOMA schemes, power-domain NOMA, where different users are allocated different power levels according to their channel conditions, has become a strong candidate.…”

Section: Introductionmentioning

confidence: 99%

Distributed Rate Control in Downlink NOMA Networks With Reliability Constraints

López

Alves

2019

IEEE Trans. Wireless Commun.

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Non-orthogonal multiple access (NOMA) has been identified as a promising technology for future wireless systems due to its performance gains in spectral efficiency when compared to conventional orthogonal schemes (OMA). This gain can be easily translated to an increasing number of served users, but imposes a challenge in the system reliability which is of vital importance for new services and applications of coming cellular systems. To cope with these issues we propose a NOMA rate control strategy that makes use only of topological characteristics of the scenario and the reliability constraint. We attain the necessary conditions so that NOMA overcomes the OMA alternative, while we discuss the optimum allocation strategies for the 2-user NOMA setup when operating with equal rate or maximum sumrate goals. In such scenario we show that the user with the largest target error probability times the ratio between the average receive signal power and the average interference power, should be scheduled to be decoded first for optimum performance. We compare numerically the performance of our allocation scheme with its ideal counterpart requiring full CSI at the BSs and infinitely long blocklength, and show how the gap increases as the reliability constraint becomes more stringent. Results also evidence the benefits of NOMA when the co-interference can be efficiently canceled, specially when the goal is to maximize the sum-rate.

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Non-Orthogonal Multiple Access: A Unified Perspective

Cited by 82 publications

References 14 publications

Secure Communications in a Unified Non-Orthogonal Multiple Access Framework

Secure Communications in a Unified Non-Orthogonal Multiple Access Framework

Decentralized Random Energy Allocation for Massive Non-Orthogonal Code-Division Multiple Access

Distributed Rate Control in Downlink NOMA Networks With Reliability Constraints

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