Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Intercluster Connection in Cognitive Wireless Mesh Networks Based on Intelligent Network Coding | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 141097 11 pages doi 2009 141097 Research Article Intercluster Connection in Cognitive Wireless Mesh Networks Based on Intelligent Network Coding Xianfu Chen 1 2 Zhifeng Zhao 1 2 Tao Jiang 3 David Grace 3 and Honggang Zhang1 2 1 Key Laboratory of Integrate Information Network Technology Zhejiang University Zheda Road 38 310027 Hangzhou China 2 Department of Information Science and Electronic Engineering Zhejiang University Zheda Road 38 310027 Hangzhou China 3 Communication Research Group Department of Electronics University of York YorkYO10 5DD UK Correspondence should be addressed to Zhifeng Zhao zhaozf@ Received 10 July 2009 Accepted 12 August 2009 Recommended by K. Subbalakshmi Cognitive wireless mesh networks have great flexibility to improve spectrum resource utilization within which secondary users SUs can opportunistically access the authorized frequency bands while being complying with the interference constraint as well as the QoS Quality-of-Service requirement of primary users PUs . In this paper we consider intercluster connection between the neighboring clusters under the framework of cognitive wireless mesh networks. Corresponding to the collocated clusters data flow which includes the exchanging of control channel messages usually needs four time slots in traditional relaying schemes since all involved nodes operate in half-duplex mode resulting in significant bandwidth efficiency loss. The situation is even worse at the gateway node connecting the two colocated clusters. A novel scheme based on network coding is proposed in this paper which needs only two time slots to exchange the same amount of information mentioned above. Our simulation shows that the network coding-based intercluster connection has the advantage of higher bandwidth efficiency compared with the traditional strategy. Furthermore how to choose an optimal relaying
