Joint Power and Time Allocation for Two-Way Cooperative NOMA

Bae, Joongmyeon; Han, Youngnam

doi:10.1109/tvt.2019.2949129

Cited by 35 publications

(20 citation statements)

References 7 publications

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“…It has advantages in the utilization of wireless networks' resources, improving spectral efficiency and enhancing network quality with regards to network throughput and error rate performance [16]. In [17], the authors proposed a scheme of jointly optimizing power and time allocations to minimize outage probability for a TWR C-NOMA network. To increase the system throughput and to ensure secure communications, the authors in [18] derived closed-form expressions of the ergodic secrecy rates under both non-colluding and colluding eavesdroppers in a TWR C-NOMA network.…”

mentioning

confidence: 99%

I/Q Imbalance and Imperfect SIC on Two-Way Relay NOMA Systems

Tian

et al. 2020

Electronics

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Non-orthogonal multiple access (NOMA) system can meet the demands of ultra-high data rate, ultra-low latency, ultra-high reliability and massive connectivity of user devices (UE). However, the performance of the NOMA system may be deteriorated by the hardware impairments. In this paper, the joint effects of in-phase and quadrature-phase imbalance (IQI) and imperfect successive interference cancellation (ipSIC) on the performance of two-way relay cooperative NOMA (TWR C-NOMA) networks over the Rician fading channels are studied, where two users exchange information via a decode-and-forward (DF) relay. In order to evaluate the performance of the considered network, analytical expressions for the outage probability of the two users, as well as the overall system throughput are derived. To obtain more insights, the asymptotic outage performance in the high signal-to-noise ratio (SNR) region and the diversity order are analysed and discussed. Throughout the paper, Monte Carlo simulations are provided to verify the accuracy of our analysis. The results show that IQI and ipSIC have significant deleterious effects on the outage performance. It is also demonstrated that the outage behaviours of the conventional OMA approach are worse than those of NOMA. In addition, it is found that residual interference signals (IS) can result in error floors for the outage probability and zero diversity orders. Finally, the system throughput can be limited by IQI and ipSIC, and the system throughput converges to a fixed constant in the high SNR region.Electronics 2020, 9, 249 2 of 16 signals of other users with lower channel gains before decoding their own signals based on the SIC technique [7]. Hence, NOMA can support multiple users with limited resources and improve spectral efficiency, which has attracted considerable attention from academia and industry. For instance, in [8,9], the authors discussed power allocation under various criteria for a downlink NOMA system. In order to improve the system throughput, a network NOMA technique was proposed and analysed for the uplink coordinated multi-point transmission (CoMP) in [10].Cooperative communications is another solution to mitigate the fading effects of wireless environments [11]. NOMA in cooperative communication systems is commonly referred to as cooperative-NOMA (C-NOMA), which is able to enhance the system reliability [12]. The authors analysed the effect of the power allocation coefficient on the error performance under a one-way relay C-NOMA system in [13]. The authors in [14] presented a new system detection scheme for a one-way relay C-NOMA system, which used the maximal ratio combining (MRC) and SIC to decode signals. Sheng Luo et al. in [15] proposed an adaptive transmission scheme based on a one-way relay C-NOMA network with a dedicated relay, which could temporarily store the received information. Recently, two-way relaying (TWR) has attracted a great deal of research attention because of its ability to achieve higher spectral efficiency in comparison to one-way relayin...

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confidence: 99%

I/Q Imbalance and Imperfect SIC on Two-Way Relay NOMA Systems

Tian

et al. 2020

Electronics

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“…It is noted that the product term can be rewritten into the following finite sum via decomposition such that Applying the identity [34,Eq. (3.352.4)], into the above integrals, one then can obtain (20). This is the end of the proof.…”

Section: Appendix C Proof Of Propositionmentioning

confidence: 71%

“…On the other hand, full-duplex mode is applied in CNOMA and such a network benefits from combining the application of TWR into a relevant approach to enhance the spectral efficiency of systems. The authors in [20] proposed a two-way cooperative relay scheme employing NOMA in which two users operating in three phases benefits from bidirectional communication scheme. They showed that its performance is better than a conventional one way CNOMA system in terms of outage probability and ergodic rate.…”

Section: Introductionmentioning

confidence: 99%

“…It is noted that these unfavorable factors are the reasons of errors in the decoding process. In [20], [22], hard problem of multiple users in two-way NOMA are still not addressed, and open problem need be addressed in terms of ability of multiple pairs of users served by principle of NOMA and practical scenario of imperfect CSI. Motivated by these, to concentrate on the two-way NOMA and imperfect CSI, it is indicated that the degraded outage performance happens due to existence of channel estimation error in this considered NOMA system.…”

Section: Introductionmentioning

confidence: 99%

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Throughput Analysis of Multipair Two-Way Replaying Networks With NOMA and Imperfect CSI

Nguyen

Rabie

et al. 2020

IEEE Access

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To improve the utilization of spectrum and system capacity, non-orthogonal multiple access (NOMA) is considered as a promising multiple access method for emerging communication technologies. Its advantageous benefits are implemented in two-way wireless networks. Power allocation factors assigned to multiple users play a key role in the successful deployment of fairness balance in NOMA. This paper considers fixed power allocation, and performance degradation is predicted in worse situation in which non-optimal power scheme and the imperfect channel state information (CSI) happen. More challenging issue happens in this system, and this paper addresses the situation of NOMA supporting multi-pair of users, in which group of users can communicate to other users to achieve acceptable throughout in two kinds of mode, i.e. delay-limited mode and delay-tolerant mode. Two performance metrics have been considered, namely, ergodic rate and outage probability. For both metrics, we derived closed-form analytical expressions as well as asymptotic performance. Numerical results show that the proposed system presents benefits to cellular networks by extending ability to serve more users who have different demands on data communication. Monte Carlo simulations are provided throughout to validate the accuracy of the derived analytical expressions. INDEX TERMS two-way relaying networks, non-orthogonal multiple access, imperfect channel state information, outage probability, ergodic rate

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“…e programming problem is a common problem in wireless communication systems, including optimal parameter setting and optimal power allocation (OPA). Bae and Han joined power and time allocation to minimize system outage probability for two-way cooperative NOMA [14]. Cao et al [15] presented two PA schemes to improve the secrecy of wireless transmissions in a NOMA system.…”

Section: Introductionmentioning

confidence: 99%

Optimal Power Allocation for Cooperative Pattern Division Multiple Access Systems

Zhang

Kang²,

2021

Mathematical Problems in Engineering

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This study focuses on the power allocation (PA) problem in code division multiple access (PDMA) networks with amplify-and-forward (AF) relays. We provide two wireless communication technical performance indexes, which are system throughput and outage probability. A multiobjective version of particle swarm optimization is proposed to solve Pareto-optimal solutions for optimal PA problems. A novel programming model is built based on improvement of constraint functions, and the accuracy and efficiency of solution can be improved via compact constraints. The technique for order preference by similarity to an ideal solution is proposed to balance the performance indicators, which include outage probability and system throughput. It has been calculated that the proposed approach for optimal PA is verified and performs better than a genetic algorithm approach.

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Joint Power and Time Allocation for Two-Way Cooperative NOMA

Cited by 35 publications

References 7 publications

I/Q Imbalance and Imperfect SIC on Two-Way Relay NOMA Systems

I/Q Imbalance and Imperfect SIC on Two-Way Relay NOMA Systems

Throughput Analysis of Multipair Two-Way Replaying Networks With NOMA and Imperfect CSI

Optimal Power Allocation for Cooperative Pattern Division Multiple Access Systems

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