A Novel Relay-Aided Transmission Scheme in Cognitive Radio Networks

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

doi:10.1109/glocom.2011.6133927

Cited by 23 publications

(39 citation statements)

References 11 publications

(22 reference statements)

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“…The authors in [3] studied the outage probability of the cognitive relay networks, in which the secondary users cooperate based on the underlay approach with limited interference constraints on the primary users. In [4], the authors proposed a new cooperative transmission scheme for cognitive radio networks where a relay node is able to help both the primary and secondary transmissions. In the secondary network, the relay is acted by the secondary user.…”

Section: Introductionmentioning

confidence: 99%

Impact of Primary User Traffic on Adaptive Transmission for Cognitive Radio with Partial Relay Selection

Rao

Alouini

et al. 2013

IEEE Trans. Wireless Commun.

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In a cognitive relay system, the secondary user is permitted to transmit data via a relay when licensed frequency bands are detected to be free. Previous studies mainly focus on reducing or limiting the interference of the secondary transmission on the primary users. On the other hand, however, the primary user traffic will also affect the data transmission performance of the secondary users. In this paper, we investigate the impact of the primary user traffic on the bit error rate (BER) of the secondary transmission, when the secondary user adopts adaptive transmission with a relay partially selected. From the numerical results, we can see that the primary user traffic seriously degrades average BER. The worse-link partial selection can perform almost as well as the global selection when the channel conditions of the source-relay links and the relay-destination links differ a lot. In addition, although the relay selection improves the spectral efficiency of the secondary transmission, numerical results show that it only has slight impact on the overall average BER, so that the robustness of the system will not be affected by the relay selection.

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Section: Introductionmentioning

confidence: 99%

Impact of Primary User Traffic on Adaptive Transmission for Cognitive Radio with Partial Relay Selection

Rao

Alouini

et al. 2013

IEEE Trans. Wireless Commun.

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“…However, when SU TX goes on vacation, it informs the PU TX being available to relay the primary signal. The works of [12], [13] have revealed that with the assistance of SU TX in forwarding the primary signal, the performance of the primary transmission is significantly enhanced. Thus, we do not delve into analyzing the performance of the primary network any more.…”

Section: System and Channel Modelmentioning

confidence: 99%

“…The idea of letting the secondary user forward the primary signal has been shown as a means of providing significant spatial diversity for the primary user [12], [13]. In the considered system, we assume that the secondary transmitter is subject to the interference power threshold of the primary receiver.…”

Section: Introductionmentioning

confidence: 99%

Performance of cognitive radio networks with finite buffer using multiple vacations and exhaustive service

Phan

Chu

Zepernick

et al. 2014

2014 8th International Conference on Signal Processing and Communication Systems (ICSPCS)

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Abstract-In this paper, we analyze the performance of a cognitive radio network where the secondary transmitter, besides its own transmission, occasionally relays the primary signal. It is assumed that the secondary transmitter employs the exhaustive service mode to transmit the secondary signal and multiple vacations to relay the primary signal. When assisting the primary transmitter, we assume that the secondary transmitter utilizes the decode-and-forward protocol to process the primary signal and forwards it to the primary receiver. Furthermore, the secondary transmitter has a finite buffer, the arriving packets of the secondary network are modeled as a Poisson process, and all channels are subject to Nakagami-fading. Modeling the system as an M/G/1/K queueing system with exhaustive service and multiple vacations, using an embedded Markov chain approach to analyze the system, we obtain several key queueing performance indicators, i.e., the channel utilization, blocking probability, mean number of packets, and mean serving time of a packet in the system. The derived formulas are then utilized to evaluate the performance of the considered system.

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“…To maintain a reasonable QoS for the SU even though the interference constraint may not be favorable, selective cooperative relaying has recently been incorporated into cognitive radio systems to achieve a desirable secondary system outage performance [2]- [7]. Indeed, we differentiate between two relay selection criterions depending on which relaying protocol is being adopted.…”

Section: Introductionmentioning

confidence: 99%

Exact Outage Probability Analysis for Relay-Aided Underlay Cognitive Communications

El-Moutaouakkil

Tourki

Qaraqe

et al. 2012

2012 IEEE Vehicular Technology Conference (VTC Fall)

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Abstract-In a spectrum sharing underlay context, we investigate the exact derivation of the outage probability for relay-aided cognitive radio communications. To give more degrees of freedom to the secondary system in acquiring a targeted quality-of-service (QoS) under the primary system interference constraint, the secondary link is assisted by a set of relays acting in a two-hop decode-and-forward selective relaying mode. By means of the cumulative distribution functions of the received signal-to-noise ratio (SNR) at the secondary receiver, we derive the end-to-end outage probability of the secondary system in its closed form. The analytical and simulation results are then compared and interestingly shown to perfectly match over the entire interference threshold region.

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A Novel Relay-Aided Transmission Scheme in Cognitive Radio Networks

Cited by 23 publications

References 11 publications

Impact of Primary User Traffic on Adaptive Transmission for Cognitive Radio with Partial Relay Selection

Impact of Primary User Traffic on Adaptive Transmission for Cognitive Radio with Partial Relay Selection

Performance of cognitive radio networks with finite buffer using multiple vacations and exhaustive service

Exact Outage Probability Analysis for Relay-Aided Underlay Cognitive Communications

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