On the performance of multi‐hop wireless relay networks

Jaafar, Wael; Ajib, Wessam; Haccoun, D.

doi:10.1002/wcm.1246

Cited by 14 publications

(12 citation statements)

References 28 publications

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“…Recently, cooperative diversity [7]- [9] has been investigated as a promising way to improve secondary transmissions in underlay CRNs (called Cognitive Relay Networks, CReN). In [10], a cooperative scheme with best-relay selection is proposed to improve the secondary outage probability with respect to a primary outage probability threshold.…”

Section: Introductionmentioning

confidence: 99%

Impact of the CSI on the Performance of Cognitive Relay Networks With Partial Relay Selection

Jaafar

Ohtsuki

Ajib

et al. 2016

IEEE Trans. Veh. Technol.

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In a cognitive relay network, a secondary cooperative transmission, sharing the same spectrum band with N primary transmissions, is considered. Assuming imperfect channel state knowledge of the interference channels (from secondary transmitters to primary receivers) at the secondary nodes, we investigate the problem of secondary achievable rate maximization under a constraint on the interference caused at the primary receivers. Different scenarios are defined based on the accuracy of estimating the interference channels at the primary receivers and the number of feedback quantization bits. For each scenario, we derive expressions for both the secondary achievable rate and the primary interference probability. Then, we investigate the associated power allocation problem and provide a sub-optimal solution. Finally, analytical and simulation results illustrate the efficiency of the provided solution in terms of secondary achievable rate and primary interference probability.Index Terms-Cognitive Radio, Amplify-and-Forward, partial relay selection, quantization.

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Section: Introductionmentioning

confidence: 99%

Impact of the CSI on the Performance of Cognitive Relay Networks With Partial Relay Selection

Jaafar

Ohtsuki

Ajib

et al. 2016

IEEE Trans. Veh. Technol.

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“…Also, user cooperative diversity transmission is being used as a new technique to form virtual antenna arrays, i.e. without using multiple antennas at each transceiver in order to obtain a diversity gain [3], [4]. This emerging technique was shown to provide dramatic gains in slow fading environments.…”

Section: Introductionmentioning

confidence: 99%

On the Performance of Relay Selection in Cognitive Radio Networks

Mlika

Ajib

Jaafar

et al. 2012

2012 IEEE Vehicular Technology Conference (VTC Fall)

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In this paper, we investigate several relaying schemes for cooperative communications in Cognitive Radio Networks (CRNs) in order to improve the performances of secondary transmissions while respecting a certain Quality of Service (QoS) requirement at the primary transmissions. We propose relaying schemes where a number of relay nodes, randomly located, may help either the primary or the secondary transmission. By defining proper relay selection criteria and power allocation schemes, we illustrate the secondary outage probability performance while guaranteeing the primary QoS. Using simulations, we present the impact of different parameters, such as the QoS requirement, the chosen relay selection criteria, the number of available relays, the positions of the relays, etc., on the secondary transmission performance. The obtained results show the potential of the proposed relaying schemes, and provide guidelines about the expected secondary performance under the impact of several parameters.

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“…The spatial diversity is provided by several paths between the source and destination through the relay nodes (RE) [3,4].…”

Section: Introductionmentioning

confidence: 99%

Adaptive relaying scheme for cognitive radio networks

Jaafar¹,

Ajib²,

Haccoun³

2013

IET Communications

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Cognitive radio (CR) systems allow unlicensed secondary users to transmit on the licensed frequency bands without degrading the licensed primary transmissions. Combining CR with other emerging transmission techniques, such as user cooperation may have many benefits on both the primary and secondary transmissions. In this study, the authors propose and investigate an adaptive relay-based cooperation scheme for CR networks that improves the secondary outage performance, while respecting a primary outage probability threshold. The proposed adaptive scheme considers one multi-antenna relay node that, by selecting the antenna(s) to use, can assist either the primary, the secondary or both transmissions simultaneously. Expressions of the conditional primary outage probability for Rayleigh fading channels are derived and used to investigate the associated power allocation problem. Simulation results show that both primary and secondary outage probabilities of the proposed scheme are significantly improved and outperform non-cooperative and cooperative schemes given in the literature.

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On the performance of multi‐hop wireless relay networks

Cited by 14 publications

References 28 publications

Impact of the CSI on the Performance of Cognitive Relay Networks With Partial Relay Selection

Impact of the CSI on the Performance of Cognitive Relay Networks With Partial Relay Selection

On the Performance of Relay Selection in Cognitive Radio Networks

Adaptive relaying scheme for cognitive radio networks

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