Multi-hop Diversity-Based Collaborative Spectrum Sensing in Cognitive Radio
In cognitive radio systems, the collaborative spectrum sensing has been put forward to combat shadowing or fading effects of the channel. However, when the detection results are sent to the fusion center through imperfect reporting channels, the performance of collaborative spectrum sensing is affected duo to the reporting errors. The performance of OR-rule over imperfect reporting channels was analyzed in this paper. And a collaborative spectrum sensing was proposed to improve the spectrum sensing performance, which is based on multi-hop diversity. The proposed method reduces the bit error of the reporting channel, and increases the lower bound of false-alarm probability of the system. The simulation results showed that the sensing performance is improved by an order of magnitude in the false alarm probability.
Keywordscognitive radio cooperative sensing reporting channels multi-hop diversity
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