一种认知无线电的联合频谱检测算法

A collaborative spectrum sensing method for cognitive radio

为了改善信噪比不同的认知无线电(cognitive radio)用户的联合频谱检测性能,提出了一种基于能量检测的两个用户合作频谱检测算法。在联合虚警概率一定的条件下,根据接收信号能量对各个用户的判决门限进行调整,增大高信噪比用户对联合检测的影响,同时减小低信噪比用户的影响,来提高联合检测概率;判决结果只占用少量比特的信息,减少了通信开销。实验结果表明,所提算法很好地逼近了搜索解,提高了联合检测性能。

In order to improve the performance of collaborative spectrum sensing in cognitive radios, we propose a spectrum sensing method based on energy detection. With a constant joint probability of false alarm, cognitive radio users change their thresh-old according to SNRs to increase the high-SNR users＇ contributions to the performance of collaborative spectrum sensing and con- strain the bad effects caused by Iow-SNR uses. The judgment results can be transmitted with one bit which can decrease the communication costs, The simulation results illustrate that proposed method has a good performance approximating to the searching one.