关键词: 认知无线电, 频谱感知, 能量概率分布, 协作

Abstract:

Cooperative spectrum sensing based on energy probability distribution (EPD) is proposed to improve the sensing performance of the cognitive radios. Instead of averaging the energy in the traditional energy detection scheme, each cooperative secondary user in the EPD scheme records the number of the received samples, its energy is over a given threshold. Correlation between the sum of the recorded numbers and the EPD of the noise is used at the data fusion center to reach a final decision. Gaussian approximation is used to analyze the performance of the proposed EPD spectrum sensing method. Simulation demonstrates that with the increase of cooperative users, the proposed scheme is of better performance than the traditional cooperative onebit hard spectrum sensing. No prior information is required in the proposed scheme.

Key words: cognitive radio, spectrum sensing, energy probability distribution, cooperation