Performance Analysis and Optimization in Two-Way Cooperative NOMA Under Two-Phase Transmission Protocol

Ma, Long; Li, Enyu; Yang, Qianqian; Wang, Xinjie; Song, Chang Yong

doi:10.1109/jsyst.2022.3178074

Cited by 7 publications

(5 citation statements)

References 32 publications

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“…In [16], the superposition of two symbols in each transceiver, antenna selection, and RS have been studied for the 2T-NOMA-TWRN scheme. In [17] and [18], by using the NOMA technique, two users, i.e. a near user and a far user, communicate with a BS at the same time.…”

Section: Introduction a Background And Related Workmentioning

confidence: 99%

“…The near user communicates with the BS through the direct link, whereas the information exchange between the BS and the far user is based on the 2T-NOMA-TWRN scheme. A dedicated relay node [17] or the near user [18] are employed to realize the 2T-NOMA-TWRN scheme. In [19], two heavily blocked users simultaneously communicate with a BS based on the 2T-NOMA-TWRN scheme, where a dedicated relay node is considered for each user.…”

Section: Introduction a Background And Related Workmentioning

confidence: 99%

“…The outage probability and the ergodic rate are the suitable metrics to evaluate and compare the performance of different schemes. Therefore, in the literature, the cooperative NOMA schemes have been analyzed in terms of the outage probability [8], [12]- [14], [16], [18], [20], [21], the ergodic rate [9], [17], [19], or both [10], [11], [15]. Also, the power allocation has been considered in [9], [14]- [18], and [21] to further improve the system performance.…”

Section: Introduction a Background And Related Workmentioning

confidence: 99%

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Performance Analysis of NOMA-Based Transmission in Two-Way Relay Network

Hesam,

Bastami,

Abdel-Hafez

2024

IEEE Access

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In this paper, we study the performance of the two-way relay network (TWRN) with NOMAbased transmission, where the information is exchanged during three time slots. To provide a fair comparison, we also examine the performance of a three-time-slot (3T) OMA-based transmission scheme. In the following, these schemes are referred to as 3T-NOMA-TWRN and 3T-OMA-TWRN. In the 3T-NOMA-TWRN scheme, each transceiver simultaneously transmits two symbols with different powers to exploit the multiplexing gain, implemented through the power-domain NOMA technique. The performance of both schemes is analyzed in terms of the outage probability, the ergodic sum-rate, and their asymptotic behaviors. The outage and rate performances of the schemes are enhanced by optimizing the power allocation coefficients, especially in the NOMA-based scheme. The proposed power allocation algorithm imposes negligible overhead because of considering the closed-form expressions of the outage probability and the ergodic sum-rate as the objective function. For the NOMA-based scheme, we propose sub-optimal power allocation strategies that closely approximate the optimal solution. The validity of the analytical results is confirmed by extensive numerical examples. The results show that the 3T-NOMA-TWRN scheme outperforms its OMAbased counterpart in terms of the outage probability and the ergodic sum-rate, especially in the high-rate and high-SNR regimes. Additionally, the 3T-NOMA-TWRN scheme significantly outperforms the existing twotime-slot (2T)-NOMA-TWRN scheme in the high-SNR regime. However, in the low-SNR regime, only in some cases, the situation changes in favor of the 2T-NOMA-TWRN scheme. Surprisingly, the performance of the 3T-OMA-TWRN scheme can significantly surpass that of the 2T-NOMA-TWRN scheme in certain situations, depending on the rate and SNR regimes and the network geometry. Furthermore, the 3T-NOMA-TWRN scheme significantly reduces the TWRN performance sensitivity to the location of relay node, which is a critical concern in both the 3T-OMA-TWRN and 2T-NOMA-TWRN schemes, especially in the latter case.INDEX TERMS Non-orthogonal multiple access (NOMA), power allocation, superposition coding, successive interference cancelation, two-way relay network (TWRN).

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Section: Introduction a Background And Related Workmentioning

confidence: 99%

Section: Introduction a Background And Related Workmentioning

confidence: 99%

Section: Introduction a Background And Related Workmentioning

confidence: 99%

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Performance Analysis of NOMA-Based Transmission in Two-Way Relay Network

Hesam,

Bastami,

Abdel-Hafez

2024

IEEE Access

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“…In the past years, the performances of NOMA schemes have been evaluated in terms of outage probability (OP) and ergodic capacity (EC) to prove the superiority of NOMA over OMA [8][9][10][11][12][13]. Also, to increase the system capacity, a nearly comprehensive analysis of CNOMA issues in terms of EC, OP with full-duplex (FD)/half-duplex (HD) in the presence of imperfect channel state information (ICSI), imperfect successive interference cancellation (ISIC) and imperfection of the hardware impairment has been performed [14][15][16][17][18][19][20][21][22]. Multiple relays scheme (e.g., selection and multi-hop relays) is one of the promising directions for increasing the system performance and expanding coverage area.…”

Section: Introductionmentioning

confidence: 99%

An efficient hybrid energy harvesting protocol for cooperative NOMA systems: Error and outage performance

Khennoufa

Khelil

Rabie

et al. 2023

Physical Communication

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“…In recent literature, cooperative NOMA has been well investigated regarding outage probability and throughput [4][5][6]. It is proven that in a perfect scenario, this scheme perfectly outperforms the other multiple access techniques.…”

Section: Introductionmentioning

confidence: 99%

Throughput performance optimization of NOMA-assisted cooperative relay system with realistic impairments

Bachan,

Shukla,

Bansal

2023

Journal of Electrical Engineering

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This work aims to investigate the outage and throughput performance of non-orthogonal multiple access assisted cooperative relay system (CRS-NOMA) considering the realistic impairments caused due to in-phase and quadrature-phase imbalance (IQI), channel estimation errors (CEE), and successive interference cancellation (SIC) errors. More specifically, we investigate a model in which two-phase downlink transmission is carried out in two different modes: (i) CRS-NOMA without direct links and (ii) CRS-NOMA with direct links (CRS-DLNOMA). In CRS-NOMA mode, the source broadcasts a composite NOMA signal to destination users with the assistance of a decode-and-forward (DF) relay. In contrast, in CRS-DLNOMA, direct and cooperative links are available for transmission. We derive the analytical expressions of outage probability and throughput for both the NOMA destinations to evaluate the system performance of both CRS-NOMA and CRS-DLNOMA modes of transmission. Furthermore, numerical simulations also study and validate the influence of IQI, CEE, and SIC errors on the outage and throughput performance. The simulation results verify that realistic impairments degrade the system performance, but the presence of direct link has a positive impact on outage and throughput. Additionally, we use the golden search method to optimize the power allocation factor (PAF) and transmission rate to maximize the throughput at the near user while ensuring the throughput constraint at the far user.

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Performance Analysis and Optimization in Two-Way Cooperative NOMA Under Two-Phase Transmission Protocol

Cited by 7 publications

References 32 publications

Performance Analysis of NOMA-Based Transmission in Two-Way Relay Network

Performance Analysis of NOMA-Based Transmission in Two-Way Relay Network

An efficient hybrid energy harvesting protocol for cooperative NOMA systems: Error and outage performance

Throughput performance optimization of NOMA-assisted cooperative relay system with realistic impairments

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