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在系统带宽一定的直接序列扩频系统中,不可能通过无限制地增大扩频增益提高系统的抗干扰容限,因此有必要引入其他的干扰抑制措施提高系统的抗干扰能力。介绍了传统的干扰抑制算法频域干扰抑制技术进行,提出了一种利用输出信噪比反馈进行自适应参数调整的置零陷波干扰抑制算法,并详细给出了算法的理论依据和算法流程。最后通过计算机仿验证了此算法恒优于传统频域干扰抑制算法中的几何平均门限法。
In direct sequence spread spectrum systems with a certain system bandwidth, it is impossible to increase the anti-interference tolerance of the system by increasing the spreading gain indefinitely. Therefore, it is necessary to introduce other interference suppression measures to improve the anti-interference ability of the system. The traditional interference suppression algorithm based on frequency domain interference suppression technology is introduced. A null-notch interference suppression algorithm based on output signal-to-noise ratio feedback is proposed, and the theoretical basis and algorithm flow of the algorithm are given in detail. . Finally, by computer simulation, this algorithm is proved to be better than the geometric mean threshold method in traditional frequency-domain interference suppression algorithm.