基于频域预加窗的差分跳频接收机设计与实现

Design and implementation of differential frequency hopping system based on frequency domain pre-windowing

在传统的差分跳频接收机的基础上,采用前置频域相关预加窗抗干扰的方法,根据G函数的相关性对下一跳可能出现的频点进行频域预加窗,把宽带接收的所有频点缩小到当前可能的几个频点,仅对差分跳频下一跳可能使用的频点进行选择性接收,可以有效提高接收机的抗干扰性能,实现起来较为简单。以软件无线电思想,在现场可编程门阵列(FP-GA)的Spartan6开发板上,采用Xilinx公司的System Generator工具进行建模设计仿真,加入干扰噪声,验证方案的可行性和设计的正确性。

In order to combat DFI （different frequency interference） a new DFH receiver based on frequency domain correlation pre-windowing is designed. Frequency domain pre-windowing is performed on the basis of G-function correlation, and all of thewideband receiving frequencies can be limited to several frequencies such that the receiver only needs to receive selectively signals at these frequencies that next hoping may use, which reduces the DFI and improves significantly the receiver anti interferenceperformance. Moreover, this new DFH receiver can be easily implemented. At last, with the idea of SDR, the engineering pro ject is modeled and simulated in the System Generator for Spartan6 launched by Xilinx. The simulation results show that the scheme is feasible and the model is correct by adding noise jamming.