An Efficient Multiple Relay Selection Scheme for Cognitive Radio Systems

Naeem, Muhammad; Lee, D. C.; Pareek, Udit

doi:10.1109/iccw.2010.5503967

Cited by 30 publications

(24 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the systems studied in [6,7] require the overlay approachthat is secondary users to sense the spectrum to determine spectrum holes. In [8,9], iterative greedy algorithms are investigated for multiple relay assignment in cognitive radio network. In [10], optimal power is allocated to the relays in a cognitive radio system comprising a single sourcedestination pair and multiple relays.…”

Section: Introductionmentioning

confidence: 99%

Max–min fairness aware joint power, subcarrier allocation and relay assignment in multicast cognitive radio

2012

Self Cite

View full text Add to dashboard Cite

The authors presented low-complexity schemes for jointly deciding subcarrier assignment, power allocation and relay assignment (JSPARA) for multiuser non-regenerative relaying in a multigroup, multicast cognitive radio system (MMCRS). The authors considered two different optimisation problems. In one optimisation problem, the authors studied the problem of maximising the sum-rate of an MMCRS. In another optimisation problem, the authors considered the problem of maximising the rate of the worst multicast group of users. And also the authors proposed low-complexity iterative algorithms for JSPARA. The proposed algorithms have low-computational complexity, and their effectiveness is verified through simulation results.

show abstract

Section: Introductionmentioning

confidence: 99%

Max–min fairness aware joint power, subcarrier allocation and relay assignment in multicast cognitive radio

2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the analyzed performance metric was the outage probability. In [10], the authors consider a multiple relay CR without considering the PU. In addition, only the interference from the relays is considered, and the SU interference was not analyzed.…”

Section: Introductionmentioning

confidence: 99%

Achievable Rate of Multi-relay Cognitive Radio MIMO Channel with Space Alignment

Sboui

Ghazzai

Rezki

et al. 2015

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

View full text Add to dashboard Cite

Abstract-We study the impact of multiple relays on the primary user (PU) and secondary user (SU) rates of underlay MIMO cognitive radio. Both users exploit amplify-and-forward relays to communicate with the destination. A space alignment technique and a special linear precoding and decoding scheme are applied to allow the SU to use the resulting free eigenmodes. In addition, the SU can communicate over the used eigenmodes under the condition of respecting an interference constraint tolerated by the PU. At the destination, a successive interference cancellation (SIC) is performed to estimate the secondary signal. We present the explicit expressions of the optimal PU and SU powers that maximize their achievable rates. In the numerical results, we show that our scheme provides cognitive rate gain even in absence of tolerated interference. In addition, we show that increasing the number of relays enhances the PU and SU rates at low power regime and/or when the relays power is sufficiently high.Index Terms-Underlay cognitive radio, MIMO space alignment, amplify-and-forward multiple-relay.

show abstract

“…The authors in [10] presented a low-complexity relay selection scheme to maximize the received signal-to-noise ratio (SNR) under the constraint of acceptable interference to the primary users. As the secondary user network is highly dynamic, we adopt the partial selection scheme to choose the best relay according to the instantaneous SNR of the relay link in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies mainly focus on how to reduce or limit the interference caused by the secondary user [10,12], or the cooperation of the primary users and secondary users to achieve double wins [13]. In this paper, we study the effects of the primary user traffic on the BER of adaptive transmission of the secondary user in a cognitive relay system with partial relay selection.…”

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.

View full text Add to dashboard Cite

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.

show abstract

An Efficient Multiple Relay Selection Scheme for Cognitive Radio Systems

Cited by 30 publications

References 11 publications

Max–min fairness aware joint power, subcarrier allocation and relay assignment in multicast cognitive radio

Max–min fairness aware joint power, subcarrier allocation and relay assignment in multicast cognitive radio

Achievable Rate of Multi-relay Cognitive Radio MIMO Channel with Space Alignment

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

Contact Info

Product

Resources

About