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Front. Inform. Technol. Electron. Eng.  2010, Vol. 11 Issue (3): 175-186    DOI: 10.1631/jzus.C0910027
    
Cooperative spectrum sensing in cognitive radio systems with limited sensing ability
Hui HUANG1, Zhao-yang ZHANG*,1, Peng CHENG2, Ai-ping HUANG1, Pei-liang QIU1
1 Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China 2 Intel China Research Center, Intel Lab, Beijing 100191, China
Cooperative spectrum sensing in cognitive radio systems with limited sensing ability
Hui HUANG1, Zhao-yang ZHANG*,1, Peng CHENG2, Ai-ping HUANG1, Pei-liang QIU1
1 Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China 2 Intel China Research Center, Intel Lab, Beijing 100191, China  
 全文: PDF(199 KB)  
摘要： In cognitive radio systems, the design of spectrum sensing has to face the challenges of radio sensitivity and wide-band frequency agility. It is difficult for a single cognitive user to achieve timely and accurate wide-band spectrum sensing because of hardware limitations. However, cooperation among cognitive users may provide a way to do so. In this paper, we consider such a cooperative wide-band spectrum sensing problem with each of the cognitive users able to imperfectly sense only a small portion of spectrum at a time. The goal is to maximize the average throughput of the cognitive network, given the primary network’s collision probability thresholds in each spectrum sub-band. The solution answers the essential questions: to what extent should each cognitive user cooperate with others and which part of the spectrum should the user choose to sense? An exhaustive search is used to find the optimal solution and a heuristic cooperative sensing algorithm is proposed to simplify the computational complexity. Inspired by this optimization problem, two practical cooperative sensing strategies are then presented for the centralized and distributed cognitive network respectively. Simulation results are given to demonstrate the promising performance of our proposed algorithm and strategies.
关键词： Cognitive radio;  Cooperative spectrum sensing;  Limited sensing ability;  Throughput    
Abstract: In cognitive radio systems, the design of spectrum sensing has to face the challenges of radio sensitivity and wide-band frequency agility. It is difficult for a single cognitive user to achieve timely and accurate wide-band spectrum sensing because of hardware limitations. However, cooperation among cognitive users may provide a way to do so. In this paper, we consider such a cooperative wide-band spectrum sensing problem with each of the cognitive users able to imperfectly sense only a small portion of spectrum at a time. The goal is to maximize the average throughput of the cognitive network, given the primary network’s collision probability thresholds in each spectrum sub-band. The solution answers the essential questions: to what extent should each cognitive user cooperate with others and which part of the spectrum should the user choose to sense? An exhaustive search is used to find the optimal solution and a heuristic cooperative sensing algorithm is proposed to simplify the computational complexity. Inspired by this optimization problem, two practical cooperative sensing strategies are then presented for the centralized and distributed cognitive network respectively. Simulation results are given to demonstrate the promising performance of our proposed algorithm and strategies.
Key words: Cognitive radio    Cooperative spectrum sensing    Limited sensing ability    Throughput
收稿日期: 2009-01-10 出版日期: 2010-03-01
CLC:  TN914.51  
基金资助: Project supported in part by the National Basic Research Program (973)  of  China  (No.  2009CB320405),  the  National  Natural  Science
Foundation  of  China  (No.  60972057),  and  the  National  High-Tech Research  and  Development  Program  (863)  of  China  (No.  2007AA
01Z257)
通讯作者: Zhao-yang ZHANG     E-mail: ning_ming@zju.edu.cn
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引用本文:

Hui HUANG, Zhao-yang ZHANG, Peng CHENG, Ai-ping HUANG, Pei-liang QIU. Cooperative spectrum sensing in cognitive radio systems with limited sensing ability. Front. Inform. Technol. Electron. Eng., 2010, 11(3): 175-186.

链接本文:

http://www.zjujournals.com/xueshu/fitee/CN/10.1631/jzus.C0910027    或    http://www.zjujournals.com/xueshu/fitee/CN/Y2010/V11/I3/175

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