The CR node in depth fading is possible to have serious false alarm or missed when using conventional collaborative spectrum sensing method. These error messages will be fully included in the final collaborative decision, which will seriously affect the performance of collaborative sensing. So,a new exponential weighted collaborative spectrum sensing based on SNR is proposed and studied as a means to combat such effects. Computer simulation results show that this method can reduce the influence of low SNR where we supposing lower than -23dB in the collaborative sensing and outperforms the conventional method.
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