Stable Throughput of Cognitive Radios With and Without Relaying Capability

Simeone, Osvaldo; Bar-Ness, Y.; Spagnolini, Umberto

doi:10.1109/tcomm.2007.910699

Cited by 338 publications

(272 citation statements)

References 16 publications

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“…However, these existing cooperative solutions assume time division multi-access (TDMA) policies where the primary users transmit in dedicated orthogonal channels, resulting in the suboptimal use of the available bandwidth [4], [5]. These systems have been analyzed in a cross-layer fashion, using tools from information theory (Physical layer) and queueing theory (Network layer) [3]- [5].…”

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confidence: 99%

Stability analysis for cognitive radio with multi-access primary transmission

Krikidis

Devroye

Thompson

2010

IEEE Trans. Wireless Commun.

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Abstract-This letter analyzes the impact, from a networklayer perspective, of having a single cognitive radio transmitterreceiver pair share the spectrum with multiple primary users wishing to communicate to a single receiver in a multi-access channel (MAC). In contrast to previous work which assumes a time division multi-access strategy, here, we assume the set of primary users simultaneously access the channel to deliver their packets to a common destination. We derive the symmetric stable throughput regions, consisting of maximal arrival rates for primary and secondary (or cognitive radio) users under two investigated protocols. The first protocol is a conventional MAC scheme where the primary and secondary nodes operate independenly. The second protocol corresponds to a multi-access relay channel (MARC) which exploits user cooperation between primary and secondary nodes. We prove that cooperation is beneficial in the considered MARC as it enables higher throughputs for both primary and secondary users.Index Terms-Cooperative diversity, cognitive radio, multiaccess relay channel, queueing theory.

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confidence: 99%

Stability analysis for cognitive radio with multi-access primary transmission

Krikidis

Devroye

Thompson

2010

IEEE Trans. Wireless Commun.

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“…Since the cognitive principle is based on the idea that the presence of the secondary system should be "transparent" to the primary, and since we are interested in the stable throughput of primary and secondary networks, we define the secondary system "transparency" as not affecting the primary system's stability [41]. In other words, for a given stable primary system with arrival rate , secondary activity will be considered transparent if the primary system maintains its stability in the presence of the secondary system.…”

Section: B Symmetric Network Casementioning

confidence: 99%

Joint Design of Spectrum Sensing and Channel Access in Cognitive Radio Networks

El-Sherif

Liu

2011

IEEE Trans. Wireless Commun.

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Abstract-Spectrum sensing is an essential functionality of cognitive radio networks. However, the effect of errors in the spectrum sensing process on the performance of the multiple access layer of both primary and secondary networks has not gained much attention. This paper aims at bridging the gap between the study of spectrum sensing and the multiple access of cognitive radio networks. To achieve this goal we pose and answer the question how the spectrum sensing errors affects the performance of cognitive radio networks from a multiple access protocol design point of view. The negative effects of the spectrum sensing errors on the throughput of both primary and secondary networks are characterized through queuing theory analysis of both networks. To alleviate these negative effects a novel joint design of the spectrum sensing and channel access mechanisms is proposed. This design is based on the observation that, in a binary hypothesis testing problem, the value of the test statistics could be used as a confidence measure for the test outcome. Therefore, this value will be used to define different channel access probabilities for secondary users. Results reveal a significant performance improvement in the maximum stable throughput of both primary and secondary networks by virtue of the proposed technique.

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“…In [10], the authors proposed a cognitive space-time-frequency coding to maximize the spectrum opportunities in the CWRN. In [11], the CR users perform the role of a relay to assist the data transmission of the PU to increase their opportunities in spectrum access. In [12], a cooperative diversity scheme was proposed for CWRN where the CR users cooperatively send both the signal of the PU and their own signals.…”

Section: Introductionmentioning

confidence: 99%

Efficient cooperative spectrum sensing for three‐hop cognitive wireless relay networks

et al. 2013

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Copyright and moral rights to this thesis/research project are retained by the author and/or other copyright owners. The work is supplied on the understanding that any use for commercial gain is strictly forbidden. A copy may be downloaded for personal, non-commercial, research or study without prior permission and without charge. Any use of the thesis/research project for private study or research must be properly acknowledged with reference to the work's full bibliographic details.This thesis/research project may not be reproduced in any format or medium, or extensive quotations taken from it, or its content changed in any way, without first obtaining permission in writing from the copyright holder(s).If you believe that any material held in the repository infringes copyright law, please contact the Repository Team at Middlesex University via the following email address:The item will be removed from the repository while any claim is being investigated. Copyright:Middlesex University Research Repository makes the University's research available electronically.Copyright and moral rights to this work are retained by the author and/or other copyright owners. No part of the work may be sold or exploited commercially in any format or medium without the prior written permission of the copyright holder(s). A copy may be downloaded for personal, noncommercial, research or study without prior permission and without charge. Any use of the work for private study or research must be properly acknowledged with reference to the work's full bibliographic details.This work may not be reproduced in any format or medium, or extensive quotations taken from it, or its content changed in any way, without first obtaining permission in writing from the copyright holder(s).If you believe that any material held in the repository infringes copyright law, please contact the Repository Team at Middlesex University via the following email address: eprints@mdx.ac.ukThe item will be removed from the repository while any claim is being investigated. This paper is concerned with cooperative spectrum sensing (CSS) mechanisms in three-hop cognitive wireless relay networks (CWRNs). The data transmission from a source to a destination is realised with the aid of two layers of cognitive radio (CR) users which are in the transmission coverage of two primary users. In this paper, we first propose a new CSS scheme for a layer of CR users to improve the spectrum sensing performance by exploiting both local decisions at the CR users and global decisions at the fusion centre. Particularly, we derive the probabilities of missed detection and false alarm for a practical scenario where all sensing, reporting, and backward channels suffer from Rayleigh fading.The derived expressions not only show that our proposed CSS achieves a better sensing performance than the conventional scheme but also characterise the effects of the fading channels on the sensing reliability. Furthermore, we propose a CSS scheme for two CR layers in a three-hop CWRN using binary XOR...

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Stable Throughput of Cognitive Radios With and Without Relaying Capability

Cited by 338 publications

References 16 publications

Stability analysis for cognitive radio with multi-access primary transmission

Stability analysis for cognitive radio with multi-access primary transmission

Joint Design of Spectrum Sensing and Channel Access in Cognitive Radio Networks

Efficient cooperative spectrum sensing for three‐hop cognitive wireless relay networks

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