Cooperative communication in wireless networks
IEEE Communications Magazine
Achievable throughput of multiple access spectrum systems based on cognitive relay
Proceedings of the 2009 ACM workshop on Cognitive radio networks
Mining spectrum usage data: a large-scale spectrum measurement study
Proceedings of the 15th annual international conference on Mobile computing and networking
A cooperative MAC protocol with virtual-antenna array support in a multi-AP WLAN system
IEEE Transactions on Wireless Communications
Adaptive unbalanced spectrum usage and power allocation for cognitive OFDM-based relay networks
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
A geometric approach to improve spectrum efficiency for cognitive relay networks
IEEE Transactions on Wireless Communications
Clustering based spectrum allocation scheme using spectral graph partitiol1ing
CAR'10 Proceedings of the 2nd international Asia conference on Informatics in control, automation and robotics - Volume 2
An adaptive cooperation diversity scheme with best-relay selection in cognitive radio networks
IEEE Transactions on Signal Processing
Experimental evaluation of a robust MAC protocol for network coded two-way relaying
NETWORKING'11 Proceedings of the IFIP TC 6th international conference on Networking
Cognitive cross-layer design with QoS provisioning for cooperative wireless networking
Proceedings of the 44th Annual Simulation Symposium
Towards cheat-proof cooperative relay for cognitive radio networks
MobiHoc '11 Proceedings of the Twelfth ACM International Symposium on Mobile Ad Hoc Networking and Computing
A highly available spectrum allocation service model in dynamic spectrum market
Future Generation Computer Systems
Performance Analysis of Partial Relay Selection in Cooperative Spectrum Sharing Systems
Wireless Personal Communications: An International Journal
Joint spectrum allocation and relay selection in cellular cognitive radio networks
Mobile Networks and Applications - Special issue on Wireless and Personal Communications
Exact Outage Probability of Underlay Cognitive Cooperative Networks Over Rayleigh Fading Channels
Wireless Personal Communications: An International Journal
Jointly optimal rate control and relay selection for cooperative wireless video streaming
IEEE/ACM Transactions on Networking (TON)
Wireless Personal Communications: An International Journal
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Recent studies demonstrated that dynamic spectrum access can improve spectrum utilization significantly by allowing secondary unlicensed users to dynamically share the spectrum that is not used by the primary licensed users. Cognitive radio was proposed to promote the spectrum utilization by opportunistically exploiting the existence of spectrum "holes." Meanwhile, cooperative relay technology is regarded widely as a key technology for increasing transmission diversity gain in various types of wireless networks, including cognitive radio networks. In this article, we first give a brief overview of the envisioned applications of: cooperative relay technology to CRNs, cooperative transmission of primary traffic by secondary users, cooperative transmission between secondary nodes to improve spatial diversity, and cooperative relay between secondary nodes to improve spectrum diversity. As the latter is a new direction, in this article we focus on this scenario and investigate a simple wireless network, where a spectrum-rich node is selected as the relay node to improve the performance between the source and the destination. With the introduction of cooperative relay, many unique problems should be considered, especially the issue for relay selection and spectrum allocation. To demonstrate the feasibility and performance of cooperative relay for cognitive radio, a new MAC protocol was proposed and implemented in a universal software radio peripheral-based testbed. Experimental results show that the throughput of the whole system is greatly increased by exploiting the benefit of cooperative relay.