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讨论了转发器实现收发不间断的方法,提出了在自适应噪声相消的系统上,将简化的分数阶傅里叶变换理论应用于时延估计,进而将干扰信号重构抵消。推导了该算法,并提出基于该算法实现收发同时进行的转发器系统,即透明转发器。给出本系统模型框图,该透明转发器采用最小均方(LMS)算法建立自适应系统控制结构,能够通过自适应滤波器将自发干扰信号减除,并将不相关的背景噪声抵消。最后利用MATLAB软件仿真了基于该算法的透明转发器在具体信号上的运用,实验结果表明该方法实现了不间断转发功能,并且系统结构简单、易实现。
This paper discusses the method of transponder to keep sending and receiving uninterrupted. On the system of adaptive noise cancellation, a simplified Fractional Fourier Transform theory is applied to time delay estimation, and then the interference signal is reconstructed. The algorithm is deduced and a transponder system, that is, a transparent transponder, is proposed based on the algorithm. The block diagram of the system is given. The transparent transponder uses the least mean square (LMS) algorithm to establish the adaptive system control structure, which can reduce the spontaneous interference signal through the adaptive filter and cancel the irrelevant background noise. At last, the application of the transparent transponder based on this algorithm is simulated by MATLAB software. The experimental results show that the method achieves the function of uninterrupted forwarding, and the system is simple and easy to implement.