Performance of Analog Network Coding with Asymmetric Traffic Requirements

Upadhyay, Prabhat K.; Prakriya, Shankar

doi:10.1109/lcomm.2011.041411.110388

Cited by 59 publications

(39 citation statements)

References 9 publications

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“…where P out;1 and P out;2 are expressed in (8) and (9). Clearly, as P out;1 and P out;2 are outage probability functions, they are convex (when drawn in a linear scale) [12].…”

Section: Optimal Power Allocation Schemementioning

confidence: 99%

“…Therefore, it makes more sense to investigate the impact of traffic asymmetry in practical system. The authors in [8,9] study the system performance of ANC with asymmetric traffic requirements and propose power allocation and relay selection methods which can achieve significant performance gains in terms of outage probability. In [10], the authors analyze the outage performance and propose a fairness-aware power allocation scheme for asymmetric two-way AF relaying network.…”

Section: Introductionmentioning

confidence: 99%

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Power Allocation for Cognitive Two-Way AF Relay Networks with Asymmetric Traffic Requirements

Shi

2015

Wireless Pers Commun

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In this paper, we study the power allocation for two-way amplify-and-forward relay networks with asymmetric traffic requirements in cognitive radio. The proposed power allocation scheme is achieved by minimizing the weaker link's individual outage probability under the sum-power constraint and interference power threshold (IPT) constraints of the primary user (PU). Particularly, for the purpose of accomplishing the power allocation more realistically, the interference to each other between PU and secondary user (SU) and relay is taken into consideration. And the closed-form solution is derived for the optimum power allocation scheme of each case. Numerical results confirm that the proposed scheme improves the system performance compared with the equal power allocation scheme under various traffic requirements. The outage probability of SU communication is limited by the IPT constraints of PU and is affected significantly by the IPT level of PU. Furthermore, regardless of the symmetric or asymmetric traffic requirements, the proposed power allocation scheme is more suitable for cognitive two-way relaying networks.

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“…where P out;1 and P out;2 are expressed in (8) and (9). Clearly, as P out;1 and P out;2 are outage probability functions, they are convex (when drawn in a linear scale) [12].…”

Section: Optimal Power Allocation Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Power Allocation for Cognitive Two-Way AF Relay Networks with Asymmetric Traffic Requirements

Shi

2015

Wireless Pers Commun

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“…This completes the proof that there is always a unique intersection point in (0,1) at which both the SINRs become equal. Hence, there is an admissible solution to the optimisation problem (10). □…”

Section: System Modelmentioning

confidence: 99%

“…Extensive studies on the performance (outage, bit error rate, sum-rate, etc.) of 2P-TWR have been reported in [1, 2, [5][6][7][8][9][10][11] and references therein for different configurations and channel-fading distributions. In this work, we focus our attention on 3P-TWR systems.…”

Section: Introductionmentioning

confidence: 99%

Performance of optimal three‐phase two‐way system with relay interference

Mandpura¹,

Prakriya

2014

IET Communications

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In this work, the authors consider an amplify-and-forward (AF)-based three-phase two-way system with interference at the relay. An optimum scheme to minimise the outage probability is formulated, and a closed form expression for the 'channeldependent' combining coefficient 'α' at the relay is derived. A novel approach is presented to derive an expression for the overall outage probability of the proposed three-phase outage-optimal two-way relaying (3P-OTWR) system. The authors also perform finite signal-to-noise (SNR) diversity-multiplexing tradeoff and throughput analysis of the system. Furthermore, the problem of outage-optimum power allocation is investigated. Using the asymptotic expression for the outage probability, it is shown that there is loss of diversity owing to interference at the relay. The authors perform Monte Carlo simulations to demonstrate that the 3P-OTWR system outperforms a conventional three-phase two-way scheme. With outage-optimum power allocation, the proposed scheme achieves a gain of approximately 3 dB in the medium-to-high SNR regime over a conventional scheme with α = 0.5 and equal power at terminals. The proposed three-phase scheme in presence of co-channel interference can provide a better throughput for higher transmission rates as compared with a two-phase scheme when operated in the high SNR regime. Numerical results demonstrate accuracy of the derived expressions.

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“…This implies that (7) -(9) is the generalised power allocation form for two-way AF relaying networks. Moreover, the overall system outage probability, defined as P out,sys = Pr[R a 4 R tha or R b 4 R thb ] [10], is another important index to evaluate system performance. Simulation results later will show that the proposed power allocation can also improve the overall system outage performance, since the overall system outage probability is dominated by the weaker link that the proposed power allocation is going to enhance.…”

mentioning

confidence: 99%

Fairness-aware power allocation for asymmetric two-way AF relaying networks

Zhang

et al. 2012

Electron. Lett.

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The outage performance fairness on asymmetric two-way amplify-andforward (AF) relaying networks is investigated. Power allocation is proposed to minimise maximum individual outage probability so as to maintain the balance between the two end nodes. It is shown that the outage performance fairness is finally achieved under various traffic requirements. Furthermore, the proposed power allocation can also obtain the system balance and improve the overall system outage performance compared with conventional uniform power allocation.Introduction: Recently there have been increasing research activities towards two-way relaying [1], which has been recognised as a promising approach to mitigate the spectral efficiency loss of conventional one-way relaying systems [2]. Of particular interest is two-way amplify-andforward (AF) relaying networks [3,4]. Specifically, for a more efficient use of the power resources, considerable attention has been concentrated on the power allocation [5,6]. In [5], the power allocation is employed to achieve the trade-off of outage probability between two terminals under a total power constraint. In [6], optimal power allocation is carried out to obtain data rate fairness on the two-way relay channel. However, most of the research contexts of the above works are limited to the idealistic assumption that the system operates in the symmetric traffic mode. In asymmetric traffic mode, one direction transmission may face outage with the other direction transmission at a certain data rate, even though data rate fairness [6] is achieved. Therefore, to ensure that both nodes play an identical role in the transmission, it makes more sense to study the outage performance fairness for asymmetric twoway AF relaying networks.In this Letter, we extend the existing work in [6], and consider outage performance fairness on asymmetric two-way AF relaying networks. We address the problem of power allocation for improving the poorer one's outage performance under a total power constraint so as to obtain an outage balance between the two end nodes. Unlike [6], only statistical information of the channel is needed in the proposed power allocation rather than the instantaneous channel information, thus lowering the implementation complexity.Notations: We use x CN (a, b) to denote a complex Gaussian random variable x with mean a and variance b. Pr[·] and | · | denote probability and absolute value, respectively.

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Performance of Analog Network Coding with Asymmetric Traffic Requirements

Cited by 59 publications

References 9 publications

Power Allocation for Cognitive Two-Way AF Relay Networks with Asymmetric Traffic Requirements

Power Allocation for Cognitive Two-Way AF Relay Networks with Asymmetric Traffic Requirements

Performance of optimal three‐phase two‐way system with relay interference

Fairness-aware power allocation for asymmetric two-way AF relaying networks

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