认知无线电中基于能量检测的协作频谱感知，考虑信噪比和检测概率的关系。分别 输出单结点和3结点的理论值与仿真值。-Cognitive radio based on energy detection cooperative spectrum sensing, consider the relationship between SNR and probability of detection. Respectively output nodes and three single-node theoretical values ​ ​ and simulation values.