On the Performance of Relay Selection in Cognitive Radio Networks

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

doi:10.1109/vtcfall.2012.6399090

Cited by 7 publications

(13 citation statements)

References 11 publications

(19 reference statements)

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“…3, we compare the secondary outage probability for the three schemes, used in the same network configuration. All schemes present a cutoff point at approximatively g PT ≃ 18.7 dB (This exact value of the cutoff point is obtained using ((11), [10]). ).…”

Section: Simulation Results and Discussionmentioning

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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Section: Simulation Results and Discussionmentioning

confidence: 99%

Adaptive relaying scheme for cognitive radio networks

Jaafar¹,

Ajib²,

Haccoun³

2013

IET Communications

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“…Cooperative diversity [2]- [4] has been recently introduced in the CR transmissions in order to improve the access of secondary nodes to the primary spectrum resource [5]- [11]. Indeed, the authors in [5]- [7] propose to assist the primary transmission using a CR relay node [5]- [6] or using the secondary transmitter [7].…”

Section: Introductionmentioning

confidence: 99%

“…In [8], best relay selection among a set of co-located relay nodes is used to increase the diversity gain of the secondary communication, while in [9] a set of relay nodes is chosen to assist the secondary users. In [10]- [11], we propose cooperation schemes for Cognitive Radio Networks (CRNs) where relay nodes may either assist the primary and/or secondary transmissions in order to improve the secondary access to the spectrum while respecting a QoS requirement at the primary communication. In [10], we propose a scheme that assists both primary and secondary systems using one relay node.…”

Section: Introductionmentioning

confidence: 99%

“…We show that the secondary outage performance is significantly improved at the expense of an increased transmit relay power. In [11], we investigate the impact of several parameters on the secondary outage probability when best selected relay nodes are used to assist either primary, secondary or both transmissions simultaneously. The obtained results present insights and a guideline about the impact of cooperative transmission schemes and their parameters such as the relay selection criterion, the network topology and the relay nodes location on the secondary outage performance.…”

Section: Introductionmentioning

confidence: 99%

“…Typically, access of secondary users to the licensed spectrum is blocked in CRNs when the constraint on the performance requirement of primary communication is not respected, in other words, whenever the primary SNR is below a cut-off value [8]- [11]. In [12], we attempt to increase the access opportunities of the secondary users to the spectrum by setting the secondary transmitter's minimum power to a nonnull value.…”

Section: Introductionmentioning

confidence: 99%

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A new cooperative transmission scheme with relay selection for cognitive radio networks

Jaafar

Ajib

Haccoun

2013

2013 IEEE Global Communications Conference (GLOBECOM)

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Secondary access to the licensed primary spectrum band at the same time as the primary nodes is generally conditioned on the satisfaction of a Quality-of-Service (QoS) requirement at the primary transmission (such as a Signal-toNoise-Ratio -SNR-threshold or a primary outage probability threshold). Consequently, at low primary SNR that is below a cut-off value, secondary transmissions are totally blocked. In this paper, we propose a new cooperative scheme for cognitive radio networks, where secondary access to the primary spectrum band is granted whether or not the primary transmission satisfies its QoS requirement thanks to the utilization of secondary relay nodes. Using relay selection and proper power allocation at the secondary nodes, we show that the proposed scheme allows secondary access with low secondary outage performance without degrading the primary outage performance. We also compare the proposed scheme to other ones presented in the literature and we study the impact of the number of available relay nodes and the primary outage threshold value on the primary and secondary outage probabilities.

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Outage performance of cognitive radio networks with multiple decode‐and‐forward relays

Wang

Lin

et al. 2016

Int J Communication

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This paper considers the cognitive radio network with one primary user (PU), one secondary user (SU), and multiple decode-and-forward relays. We propose a relaying scheme to ensure the priority of primary transmission, where the relays are used to forward PU's message and sometimes also SU's message. First, SU is allowed to use the spectrum to transmit only when its transmission would not affect the decoding status of PU's message at all relays. Second, once the secondary transmission happens, the relays that successively decode SU's message are allowed to retransmit this message when it would not affect the decoding status of PU's message at primary receiver. The interference from PU to SU and the interference from SU to PU are both considered. By analyzing the decoding status of primary message and secondary message at different relays, we formulate the outage probabilities of both primary transmission and secondary transmission. When all channels follow Rayleigh distributions, we derive the analytical expressions for the general case of any number of relays, which are validated by means of Monte Carlo simulations. or improving PU's transmission by applying sophisticated signal processing and coding. In the interweave approach, SU utilizes the spectrum not currently being used by PU.A number of transmission schemes for CRN have emerged in literature. In particular, to improve the spatial diversity order, the technique of relaying has been introduced into CRN. Authors in [6-9] considered one-relay scenario, and authors in [10-13] considered multi-relay scenario, where in the latter only one appropriate relay node is selected to forward the received signals. However, in [14], multiple relays may be selected to forward SU's signals, and SU does not know which and how many secondary relays will be selected and participate in the second phase. In these papers, [7][8][9][10]12] analyzed the performance when considering the interference from PU to SU, and [12] is the first paper analyzing the outage probability in underlay cognitive networks with multiple relays when considering this interference.In the aforementioned works, that is, [6][7][8][9][10][11][12][13], the relays are only deployed for secondary transmission. Nevertheless, some other papers discussed the case when the relays may assist the primary or/and secondary transmission. In [15][16][17], the relays would forward PU's or SU's message depending on the decoding status in the first phase. In [18][19][20], a relay node could help simultaneously the primary and the secondary transmissions. Actually, primary system stands for the existing communication systems, which have been studied widely when deployed with multiple relays. All what we can do is the designs based on the existing framework; thus, it is reasonable to investigate the CRN when relays are deployed mainly for primary transmission. When the resources at the relays are redundant for primary system, the relays might also be used for secondary transmission on the premise that this operation would n...

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On the Performance of Relay Selection in Cognitive Radio Networks

Cited by 7 publications

References 11 publications

Adaptive relaying scheme for cognitive radio networks

Adaptive relaying scheme for cognitive radio networks

A new cooperative transmission scheme with relay selection for cognitive radio networks

Outage performance of cognitive radio networks with multiple decode‐and‐forward relays

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