Cooperative Spectrum Sensing for Cognitive Radio in Flat-Fading Environment
نویسنده
چکیده
In cognitive radio system, the secondary users can use the frequency bands when the primary users are not present. Therefore, the secondary users need to sense the channel periodically. When the primary users are detected, the secondary users have to stop using that channel. This makes the probability of detection important to the cognitive radio system. However, detection is compromised when a secondary user experiences fading. The simulation results show that the detection probability of Rayleigh fading channel is 10dB worse than the additive white Gaussian noise channel. The cooperative schemes have been shown to improve the performance in MIMO system. In this paper, we will discover weather the cooperative scheme can improve the probability of detection. The results indicate that with only a few users in cooperation, the detection probability can be increased by 40% in fading channel at low SNR.
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