Non-Orthogonal Multiple Access With Coordinated Direct and User-Assisted Transmission

Yang, Mengqi; Chen, Jian; Hu, Rose Qingyang; Yang, Long

doi:10.1109/lcomm.2020.3026368

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…We aim to improve system capacity by designing a multi‐phase coordinated direct and user‐assisted transmission strategy, the main contributions of this work are outlined as follows: (i)We propose a novel MP‐CDUAT strategy for applying cooperative NOMA to improve the EC of the system, and a user scheduling scheme is designed to cooperate with the MP‐CDUAT strategy implementation to eliminate interference between users and improve the spectrum efficiency of FU. (ii)To evaluate the throughput of the proposed MP‐CDUAT strategy, the analytical expression is derived for EC of served NUs and FU. With the derived results, it is theoretically demonstrated that the capacity scaling of served NUs and FU, respectively, are

\log _2 \rho

and

{\frac{{L - 1}}{L}{{\log _2 }}({\frac{1}{\beta }} )}

in the high ρ regime. (iii)Additionally, simulation results demonstrate the EC enhancement of the proposed strategy over the H‐CDRT [23], NOMA‐CDUT [24] and MP‐CDUAT‐OMA strategies, meanwhile, this superiority can be further expended as the increasing transmission phases L . …”

Section: Introductionmentioning

confidence: 87%

“…To evaluate the performance of the MP‐CDUAT, we compare the proposed transmission strategy with the H‐CDRT [23], NOMA‐CDUT [24] and MP‐CDUAT‐OMA strategies, where the user scheduling scheme in NOMA‐CDUT and MP‐CDUAT‐OMA follows our proposed scheme.…”

Section: Capacity Analysismentioning

confidence: 99%

“…To evaluate the performance of the MP-CDUAT, we compare the proposed transmission strategy with the H-CDRT [23], NOMA-CDUT [24] and MP-CDUAT-OMA strategies, where the user scheduling scheme in NOMA-CDUT and MP-CDUAT-OMA follows our proposed scheme. The H-CDRT strategy has studied a four-phase hybrid uplink and downlink transmission model to improve the spectral efficiency of the system.…”

Section: Benchmark Strategiesmentioning

confidence: 99%

See 2 more Smart Citations

Capacity enhancement for cooperative NOMA systems by successive user relaying

et al. 2022

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This paper proposes a novel multi-phase coordinated direct and user-assisted transmission (MP-CDUAT) strategy for a non-orthogonal multiple access system consisting of a base station (BS), K near users (NUs) and a far user (FU). In the first phase, the BS directly serves an opportunistically scheduled NU. For the rest phases, an NU scheduling scheme is developed to jointly select two NUs in each phase, where one receives desired message from the BS and the other one serves as a relay to help FU's receiving. To evaluate the performance of the proposed MP-CDUAT strategy, the analytical expression of the ergodic capacity (EC) for both NU and FU is derived. With the derived results, the EC scaling of NU and FU are, respectively, derived in the high 𝜌 regime, where the EC scaling of FU increases with the transmission phase, while the EC scaling of NU remains the same. Finally, the numerical and simulation results show that (a) our proposed strategy can improve the performance of FU without affecting the capacity scaling of served NUs; (b) the performance gain achieved by the proposed strategy is more prominent with the increasing number of the transmission phases.

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\log _2 \rho

and

{\frac{{L - 1}}{L}{{\log _2 }}({\frac{1}{\beta }} )}

Section: Introductionmentioning

confidence: 87%

Section: Capacity Analysismentioning

confidence: 99%

Section: Benchmark Strategiesmentioning

confidence: 99%

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Capacity enhancement for cooperative NOMA systems by successive user relaying

et al. 2022

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show abstract

“…Moreover, the power allocation coefficient was optimized to maximize the ergodic sum-rate. Yang et al extended NOMA-CDRT with multiple NUs and a best-NU scheduling scheme in which the NU with minimum OP was selected to forward the signals for the FU in [12]. The closed-form expressions for the exact and asymptotic OP were derived.…”

Section: A Backgroud and Related Workmentioning

confidence: 99%

On Secure NOMA-CDRT Systems with Physical Layer Network Coding

Lei¹,

Xusheng²,

Park³

et al. 2022

Preprint

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This paper proposes a new scheme to enhance the secrecy performance of a NOMA-based coordinated direct relay transmission system (NOMA-CDRT) with an untrusted relay. The physical-layer network coding and the non-orthogonal multiple access scheme are combined to improve the spectrum efficiency. Furthermore, the inter-user interference and friendly jamming signals are utilized to suppress the eavesdropping ability of the untrusted relay without affecting the acceptance quality of legitimate users. Specifically, the far user in the first slot and the near user in the second slot act as jammers to generate jamming signals to ensure secure transmissions of the confidential signals. We investigate the secrecy performance of the proposed scheme in NOMA-CDRT systems and derive the closedform expression for the ergodic secrecy sum rate. The asymptotic analysis at high signal-to-noise ratio is performed to obtain more insights. Finally, simulation results are presented to demonstrate the effectiveness of the proposed scheme and the correctness of the theoretical analysis.

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“…There are many outstanding works on the performance analysis of CDRT systems, such as outage probability (OP) [4]- [9], ergodic sum rate [5], [6], [10]- [13], and average bit error rate (ABER) [11], [14]. Liu et al studied the outage performance of a satellite-assisted CDRT system and derived the closed-form expression for the exact and asymptotic OP in [4].…”

mentioning

confidence: 99%

On Secure CDRT With NOMA and Physical-Layer Network Coding

Lei

Xusheng

Park

et al. 2023

IEEE Trans. Commun.

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This paper proposes a new scheme to enhance the secrecy performance of non-orthogonal multiple access (NOMA)based coordinated direct relay transmission (CDRT) systems with an untrusted relay. The physical-layer network coding (PNC) and the NOMA schemes are combined to improve spectrum efficiency. Furthermore, inter-user interference and friendly jamming signals are utilized to suppress the eavesdropping ability of the untrusted relay without compromising the acceptance quality of legitimate users. Specifically, the far user in the first slot and the near user in the second slot act as jammers that generate jamming signals to ensure secure transmissions of confidential messages. We investigate the secrecy performance of the NOMA-based CDRT systems with the PNC scheme and derive the closed-form expression for the ergodic secrecy sum rate. The asymptotic analysis at a high signal-to-noise ratio is performed to obtain more insights. Finally, simulation results are presented to demonstrate the proposed scheme's effectiveness and the theoretical analysis's correctness.

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Non-Orthogonal Multiple Access With Coordinated Direct and User-Assisted Transmission

Cited by 9 publications

References 11 publications

Capacity enhancement for cooperative NOMA systems by successive user relaying

Capacity enhancement for cooperative NOMA systems by successive user relaying

On Secure NOMA-CDRT Systems with Physical Layer Network Coding

On Secure CDRT With NOMA and Physical-Layer Network Coding

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