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Mathematical Problems in Engineering
Volume 2014, Article ID 106106, 7 pages
Research Article

A Hybrid Combination Scheme for Cooperative Spectrum Sensing in Cognitive Radio Networks

Institute of Communications Engineering, PLA University of Science and Technology, Nanjing, China

Received 23 October 2013; Revised 20 January 2014; Accepted 22 January 2014; Published 6 March 2014

Academic Editor: Linying Xiang

Copyright © 2014 Changhua Yao and Qihui Wu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We propose a novel hybrid combination scheme in cooperative spectrum sensing (CSS), which utilizes the diversity of reporting channels to achieve better throughput performance. Secondary users (SUs) with good reporting channel quality transmit quantized local observation statistics to fusion center (FC), while others report their local decisions. FC makes the final decision by carrying out hybrid combination. We derive the closed-form expressions of throughput and detection performance as a function of the number of SUs which report local observation statistics. The simulation and numerical results show that the hybrid combination scheme can achieve better throughput performance than hard combination scheme and soft combination scheme.