Exact Outage Probability of Cooperative Diversity with Opportunistic Spectrum Access

Suraweera, Himal A.; Smith, Peter J.; Surobhi, Nusrat Ahmed

doi:10.1109/iccw.2008.20

Cited by 45 publications

(25 citation statements)

References 15 publications

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“…Ref. [10] considered the same cognitive relay network architecture described in [9] and derived exact expressions for the outage probability of the repetition-based scheme and selection cooperation. Meanwhile, refs.…”

Section: Introductionmentioning

confidence: 99%

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Optimal power allocation for cognitive relay networks: amplify-and-forward versus selection relay

Yue

Zheng

Meng

et al. 2010

Sci. China Inf. Sci.

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We consider a cognitive relay network which is defined by a source, a destination, and cognitive relay nodes and primary user nodes. In this network, a source is assisted by cognitive relay nodes which allow coexisting with primary user nodes by imposing severe constraints on the transmission power so that they operate below the noise floor of primary user nodes. In this paper, we mainly study the power allocation strategies of this system to minimize the outage probability subject to total and individual power constraints for cognitive relay nodes and subject to interference constraints for primary user nodes. A relay transmission scheme, namely amplify-and-forward (AF), is considered. We first present an optimal power allocation (OPA) scheme to minimize the system outage probability, based on instantaneous channel state information among the source, destination and relay nodes and mean channel gains between primary user nodes and cognitive relays. Next, we propose a selection AF scheme (S-AF) where the single best relay is chosen to assist in the transmission and study power allocation strategy for S-AF to minimize outage probability. The analytical power allocation strategies have been validated through numerical simulations. The results indicate that the AF with OPA and S-AF with OPA have significantly better outage behavior and average throughput than AF and S-AF schemes respectively. We also find that S-AF with OPA achieves a higher throughput, and hence lower outage probability than AF with OPA.Keywords cognitive radio (CR), relay networks, power allocation, outage probability CitationYue W J, Zheng B Y, Meng Q M, et al. Optimal power allocation for cognitive relay networks: amplify-and-forward versus selection relay.

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Section: Introductionmentioning

confidence: 99%

“…However, the extension of these algorithms to cognitive relay networks is not obvious. Recently, the combination of relaying and cognitive radio techniques has been investigated [9][10][11]. Ref.…”

Section: Introductionmentioning

confidence: 99%

Optimal power allocation for cognitive relay networks: amplify-and-forward versus selection relay

Yue

Zheng

Meng

et al. 2010

Sci. China Inf. Sci.

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“…Specifically, when multiple relays are available to assist the service, the performance of the transmission can be significantly improved [4], [5]. As a result, cognitive relay networks (CRN) have been of huge interest [6]- [11].…”

Section: Introductionmentioning

confidence: 99%

“…The outage probabilities of the CRNs have been derived with considering the impact of the spectrum sensing accuracy in overlay coexistence [6], [12]. In addition, the performances of both PUs and SUs are studied in a CRN in comparison to the conventional relay networks [7].…”

Section: Introductionmentioning

confidence: 99%

Outage probability of a multi-relay cognitive network with an uncertain number of forwarding relays

Gross

Schmeink

2014

2014 11th International Symposium on Wireless Communications Systems (ISWCS)

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Abstract-In this paper, we focus on a Cognitive Relay Network (CRN) where only the information of the average channel gains is available at the secondary source. A distributed multiple relay selection scheme is proposed for the secondary transmission. Since the secondary source does not fully control the selection but lets each secondary relay decide by itself, it doesn't know which and how many relays will participate in the forwarding. This brings a serious uncertainty in the number of forwarding relays. We analyze this uncertainty and derive the closed-form expression of the outage probability of the secondary transmission under the uncertainty. Finally, we evaluate the proposed relay selection scheme by means of simulation. The simulation shows the appropriateness of our analytical model. In addition, although having lower interference constraint at each relay, the performances of the proposed multi-relay CRN scheme are shown to be strictly superior to the single relay CRN. Moreover, the simulation results suggest that it is necessary to spend the general overhead for secondary networks on knowing the exact QoS requirement of the primary user (i.e. the interference violation probability) to apply our proposed relay selection scheme with the statistical total interference constraint.

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“…In [5], the approximate outage probability and diversity order of repetition-based cognitive relay networks were studied, in which cognitive relays operate in unused frequency bands only. For a similar scenario, the closed-form expression of outage probability for cognitive opportunistic networks was derived, showing that the inability of relays to sense unoccupied spectrum can cause a larger drop in the network performance, especially in high signal-to-noise ratio (SNR) regime [6]. Considering the maximum allowable interference level at the PU, the performance of relay-assisted cognitive radio networks in terms of outage probability was provided in [7].…”

Section: Introductionmentioning

confidence: 99%

Outage Analysis of Cognitive Multihop Networks under Interference Constraints

Bao

Duong

2012

IEICE Trans. Commun.

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SUMMARYIn this letter, we consider a cognitive radio based multihop network under the spectrum sharing underlay paradigm. By taking into account the interference constraints, we present an exact closed-form expression for outage probability, which is valid for the whole signal-to-noise ratio regime. In addition, some numerical examples of interest that study the effect of the number of hops and/or the interferer threshold on primary users are illustrated and discussed. Numerical results show that multihop systems still offer a considerable gain as compared to direct transmission under the same limit of interference.

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Exact Outage Probability of Cooperative Diversity with Opportunistic Spectrum Access

Cited by 45 publications

References 15 publications

Optimal power allocation for cognitive relay networks: amplify-and-forward versus selection relay

Optimal power allocation for cognitive relay networks: amplify-and-forward versus selection relay

Outage probability of a multi-relay cognitive network with an uncertain number of forwarding relays

Outage Analysis of Cognitive Multihop Networks under Interference Constraints

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