A novel energy detection algorithm based on power distribution difference

Aim at the shortcoming of energy detection under low SNR, a novel energy detection algorithm based on power distribution difference (NED-BPDD)is proposed. The article analyzes the power distribution difference of frequency signal, defines the ratio of the some sub-band power to the reference sub-band power which has the minor power as the decision statistic and then derives the closed form expression of decision threshold based on constant false alarm probability criterion (CFAR). The simulation results show that NED-BPDD is robustness to noise uncertainty and has low computational complexity.