CAJ | 학술논문

认知无线电中，快速有效的频谱感知是一项关键技术。传统的能量检测算法不能抵抗低信噪比的影响，高阶循环谱检测又有着较高的算法复杂度。将二者进行结合，提出一种双门限三级联合频谱感知算法，有效提高了系统的检测性能并降低了算法复杂度。对传统的能量检测算法进行了仿真，并对检测概率的影响因素进行了分析和仿真；对高阶循环谱检测算法进行了理论分析，并对三级联合感知算法的性能进行了详细分析。最终得出结论，三级联合感知算法不但大大提高了认知用户的检测性能，而且并没有增加过多的运算量，因此是一种高效、快速的频谱感知算法。
인지무선전중，쾌속유효적빈보감지시일항관건기술。전통적능량검측산법불능저항저신조비적영향，고계순배보검측우유착교고적산법복잡도。장이자진행결합，제출일충쌍문한삼급연합빈보감지산법，유효제고료계통적검측성능병강저료산법복잡도。대전통적능량검측산법진행료방진，병대검측개솔적영향인소진행료분석화방진；대고계순배보검측산법진행료이론분석，병대삼급연합감지산법적성능진행료상세분석。최종득출결론，삼급연합감지산법불단대대제고료인지용호적검측성능，이차병몰유증가과다적운산량，인차시일충고효、쾌속적빈보감지산법。
In cognitive radio, fast and effective spectrum sensing method is a key technology. The conventional energy detection algorithm can’t resist the influence of low SNR, and high-order cyclic spectrum detection algorithm is of high complexity. This paper combines the two algorithms, and presents a double threshold three level joint spectrum sensing algorithm. This algorithm can effectively improve the detection performance and decrease the algorithm complexity. It simulates the traditional energy detection algorithm and analyzes the influence factors of this system. It also makes a theo-retical analysis of high-order cyclic spectrum detection, and makes a detailed analysis of the performance of three level joint spectrum sensing algorithm. It reaches a conclusion that three level joint sensing algorithm not only promotes the detec-tion performance of cognitive users, but also just has a small increase in computation complexity. So, it is an effective and fast spectrum sensing algorithm.