Multi-bit judgment cooperation self-adaptation spectrum sensing method based on confidence degrees in cognition OFDM system

The invention relates to the technical field of information and communication, in particular to a multi-bit judgment cooperation self-adaptation spectrum sensing method based on confidence degrees in a cognition OFDM system to solve the problem that all cognition user local detection results are not fully utilized. The confidence degree concept is introduced into a multi-bit judgment model for the probably existing situation that malicious user attack and the inconsistent signal to noise ratio exist and several users are in the deep fading scene in the actual application scene. According to the multi-bit judgment cooperation self-adaptation spectrum sensing method, the cognition users carry out local judgment firstly, a fusion center carries out weight fusion and comparison judgment, the confidence degree increment is calculated according to the weighted average difference between the cognition user local judgment results and all cognition node judgment results, and the confidence degrees of all cognition users are updated and are utilized to solve respective weights for next time detection. The multi-bit judgment cooperation self-adaptation spectrum sensing method is suitable for information and communication occasions.