Title :
Intelligent Cooperative Spectrum Sensing via Hierarchical Dirichlet Process in Cognitive Radio Networks
Author :
Xin-lin Huang ; Fei Hu ; Jun Wu ; Hsiao-Hwa Chen ; Gang Wang ; Tao Jiang
Author_Institution :
Dept. of Inf. & Commun. Eng., Tongji Univ., Shanghai, China
Abstract :
Cognitive radio (CR) is a critical technology for improving spectrum utilization and solving the radio spectrum scarcity problem. In CR devices, spectrum sensing is important to implement opportunistic spectrum access. Many spectrum sensing schemes have been proposed, including uncooperative, cooperative, centralized, and distributed algorithms. However, they aimed to obtain a global consensus sensing result, which may not always be possible in large-scale cognitive radio networks (CRNs) due to heterogeneous spectrum availability in different areas. Hence, some new spectrum sensing schemes should be designed to discover idle heterogeneous spectrum in CRNs. In this paper, we propose an intelligent cooperative spectrum sensing algorithm based on a non-parametric Bayesian learning model, namely the hierarchical Dirichlet process, which groups spectrum sensing data without the need to know the number of hidden spectrum states, and discovers a common sparse spectrum within each group. Furthermore, a concisely distributed information exchange scheme is designed, where intra-cluster and inter-cluster spectrum information is shared for global spectrum cognition. Experimental results show that the proposed algorithm can exploit the spatial relationship among sensed data to achieve a better spectrum sensing performance in terms of detection probability and false alarm probability.
Keywords :
cognitive radio; radio spectrum management; signal detection; CR devices; centralized algorithms; cognitive radio networks; detection probability; distributed algorithms; distributed information exchange scheme; false alarm probability; global spectrum cognition; hierarchical Dirichlet process; hierarchical dirichlet process; intelligent cooperative spectrum sensing algorithm; inter-cluster spectrum information; intra-cluster spectrum information; nonparametric Bayesian learning model; opportunistic spectrum access; radio spectrum scarcity problem; spectrum sensing performance; spectrum sensing schemes; spectrum utilization; Bayes methods; Data models; Educational institutions; Information exchange; Sensors; Wireless communication; Wireless sensor networks; Cognitive radio; distributed information exchange; hierarchical Dirichlet process; intelligent spectrum sensing; non-parametric Bayesian learning;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
DOI :
10.1109/JSAC.2014.2361075