Non-Orthogonal Multiple Access for Cooperative Communications: Challenges, Opportunities, and Trends

Wan, Dehuan; Wen, Miaowen; Ji, Fei; Yu, Hua; Chen, Fangjiong

doi:10.1109/mwc.2018.1700134

Cited by 153 publications

(100 citation statements)

References 16 publications

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“…Notice that it is required that µ 0.1 ( 10% of the co-interference is not canceled) so that NOMA is preferable to OMA. This is 7 This behavior can be corroborated by checking that indeed d illustrated in Fig. 8b, where the gains of NOMA over OMA are of 39%, 38% and 42% when µ → 0 for the benchmark and CSI-free schemes with ǫ i = 10 −1 and ǫ i = 10 −2 , respectively; while when µ → 1, OMA offers a performance gain around of 72%, 81% and 71%.…”

Section: Methodssupporting

confidence: 68%

“…Particularly, the work in [6] studies the tradeoff between data rate performance and energy consumption by examining the problem of energy-efficient user scheduling and power optimization in 5G NOMA heterogeneous networks. The scenario of NOMA-based cooperative relay network is explored in [7], while coordinated multipoint transmissions in downlink NOMA cellular systems are analyzed in [8].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodssupporting

confidence: 68%

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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“…2 that the SOP is enhanced by increasing K due to the improved diversity of the cooperative NOMA systems. One can also find that the 5 We omit the results for TSRS scheme since it is exactly the same as that for OSRS. SOP depends merely on the RS scheme and is independent of K in the high-ρ region.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Secrecy Outage Analysis for Cooperative NOMA Systems With Relay Selection Schemes

Lei

Yang

Park

et al. 2019

IEEE Trans. Commun.

130

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This paper considers the secrecy outage performance of a multiple-relay assisted non-orthogonal multiple access (NOMA) network over Nakagami-m fading channels. Two slots are utilized to transmit signals from the base station to destination. At the first slot, the base station broadcasts the superposition signal of the two users to all decode-and-forward relays by message mapping strategy. Then the selected relay transmits superposition signal to the two users via power-domain NOMA technology. Three relay selection (RS) schemes, i.e., optimal single relay selection (OSRS) scheme, two-step single relay selection (TSRS) scheme, and optimal dual relay selection (ODRS) scheme, are proposed and the secrecy outage performance are analyzed. As a benchmark, we also examine the secrecy outage performance of the NOMA systems with traditional multiple relays combining (TMRC) scheme in which all the relay that successfully decode signals from the source forward signals to the NOMA users with equal power. Considering the correlation between the secrecy capacity of two users and different secrecy requirement for two NOMA users, the closed-form expressions for the security outage probability (SOP) of the proposed OSRS, TSRS, and ODRS schemes along with the TMRC scheme are derived and validated via simulations. To get more insights, we also derive the closedform expressions for the asymptotic SOP for all the schemes with fixed and dynamic power allocations. Furthermore, the secrecy diversity order (SDO) of cooperative NOMA systems is obtained. The results demonstrate that our proposed schemes can significantly enhance the secrecy performance compared to the TMRC scheme and that all the RS schemes with fixed power allocation obtain zero SDO and the OSRS scheme with dynamic power allocation obtains the same SDO as TMRC.

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“…Non-orthogonal multiple access (NOMA) has been recently shown as one of potential candidates for 5G and beyond based wireless networks to overcome the limitations of the current technologies such as energy efficiency, latency and user fairness [1]- [4]. The critical feature of NOMA technique is that multiple users are permitted to use the same resources in terms of time and frequency and the power allocation for these users is based on their channel conditions [2].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Power-Splitting Relaying Protocol in SWIPT Based Cooperative NOMA Systems

Tran

Phan

Vien³

2020

Preprint

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This paper investigates a relay assisted simultaneous wireless information and power transfer (SWIPT) for downlink in cellular systems. Cooperative non-orthogonal multiple access (C-NOMA) is employed along with power splitting (PS) protocol to enable both energy harvesting (EH) and information processing (IP). A downlink model consisting of a base station (BS) and two users is considered, in which the near user (NU) is selected as a relay to forward the received signal from the BS to the far user (FU). Maximum ratio combining is then employed at the FU to combine both the signals received from the BS and NU. Closed form expressions of outage probability (OP), throughput, ergodic rate and energy efficiency (EE) are firstly derived for the SWIPT based C-NOMA considering both scenarios of having and without having direct link between the BS and FU. The impacts of EH time, EH efficiency, power-splitting ratio, source data rate and distance between different nodes on the performance are then investigated. The simulation results show that the C-NOMA with direct link achieves an outperformed performance over C-NOMA without direct link. Moreover, the performance of C-NOMA with direct link is also higher than that for OMA. Specifically, (i) the outage probability for C-NOMA in both direct and relaying link cases is always lower than that for OMA. (ii) the outage probability, throughput and ergodic rate vary according to b, (iii) the EE of both users can obtain in SNR range of from -10 to 5 dB and it decreases linearly as SNR increases. Numerical results are provided to verify the findings.

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Non-Orthogonal Multiple Access for Cooperative Communications: Challenges, Opportunities, and Trends

Cited by 153 publications

References 16 publications

Distributed Rate Control in Downlink NOMA Networks With Reliability Constraints

Distributed Rate Control in Downlink NOMA Networks With Reliability Constraints

Secrecy Outage Analysis for Cooperative NOMA Systems With Relay Selection Schemes

Performance Analysis of Power-Splitting Relaying Protocol in SWIPT Based Cooperative NOMA Systems

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