An improved united domain spectral analysis in cognitive radio

Cognitive radio technology provides a strong technical support for addressing the shortage of spectrum resources, implementing dynamic spectrum management and improving spectrum efficiency. For the difference in the cognitive user terminals´ environment will lead to the difference of each node´s test reliability, this paper advances a new type of space-time-frequency domain multi-dimensional spectrum sensing method, which introduces the evidence theory to the decision fusion. We take energy detection as an example, derived the testing expression under Additive White Gaussian Noise (AWGN) channel. The simulation results show that the proposed algorithm is better than the traditional multi-node spectrum sensing algorithm in the performance.