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讨论了当利用灰色频谱进行认知无线电通信时,第二用户对授权用户频谱所造成的干扰,并对这种干扰进行了计算。进一步分析中,以授权用户的信号干扰噪声比余量为基础,讨论并仿真了第二用户在保证授权用户正常通信时自身的信噪比受到来自授权用户的影响。结果表明,在灰色频谱区域进行认知无线电通信时,为改善第二用户信号干扰噪声比,其发射功率与通信距离将会是动态调整的。
The interference caused by the second user to the spectrum of the authorized user when using gray spectrum for cognitive radio communication is discussed and the interference is calculated. In the further analysis, based on the signal-to-interference ratio of the authorized users, the second user’s own SNR is affected by the authorized users when guaranteeing the normal communication between authorized users. The results show that the transmit power and communication distance will be dynamically adjusted in order to improve the signal to interference and noise ratio of the second user when performing cognitive radio communication in gray spectrum.