认知无线电中自适应分步合并协作频谱感知算法

doi:10.3969/j.issn.1001-2400.2010.04.015

Abstract

Abstract:

Based on equal gain combination cooperative spectrum sensing, an adaptive step by step combination cooperative spectrum sensing in cognitive radio (CR) network is proposed. With the change of the Signal-to-Noise Ratio received by CR users, this algorithm can adjust automatically the number of CR users which participate in cooperative spectrum sensing in order to decrease the data overhead produced by spectrum sensing in the cognitive radio network. The formula for computing the average data magnitude from the CR users to the central controller over Rayleigh channels is acquired. Theoretical analysis and simulation results show that the method reduces the average data overhead from the CR users to the central controller under the same detection performance compared with the conventional equal gain combination cooperative spectrum sensing.

Key words: communication systems, cognitive radio, spectrum sensing, energy detection, adaptive step by step combination

DING Han-qing;YANG Jia-wei;ZHAO Zhi-yuan. Adaptive step by step combination cooperative spectrum sensing in cognitive radio systems[J].J4, 2010, 37(4): 665-670.

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Adaptive step by step combination cooperative spectrum sensing in cognitive radio systems

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