瑞利信道下多门限频谱合作感知方法研究

Multi-Threshold Energy Detection of Cooperative Spectrum Sensing in Fading Channel

随着通信方式由语音转向多媒体应用,人们对高速无线传送的需求与日俱增。然而由于有限的自然频谱,现行的静态频率分配机制不能满足快速激增的高速通信设备的要求。因此,需要能够提高频谱利用效率的创新技术,认知无线电的出现解决了这种频谱拥塞的问题,本文将研究在能量探测频谱感知过程中使用多门限判决方法,在认知无线电网络中,决策中心接收多个认知无线电的观测数值,做出决定判断是否存在主用户。研究表明在瑞利信道下进行能量探测的合作频谱感知,采用多门限的判决方法能使感知效果的到提升。

As the communication is developing from voice to multimedia applications, the demand of people for high speed wireless transport grows day by day. However, due to the limited natural frequency spectrum, the existing static frequency distribution mechanism can＇t meet the rapid surge of high-speed communication equipment requirements. Therefore, improvement of spectrum efficiency innovation technology is urgent. The emergence of the cognitive radio can solve the frequency spectrum congestion problem. This paper will study in energy detection spectrum perception process using multi threshold judgment method. In the cognitive radio network, fusion center receives cognitive radio observation value, and makes a decision judge whether there are primary users. Research shows that in the Rayleigh channel under the energy detection cooperation spectrum perception, the multi threshold judgment method can make the perception effect to ascend.