基于FFT的DSSS系统变换域窄带干扰抑制技术的研究

为了消除直接扩频系统中的窄带干扰，采用变换域中的频域抗窄带干扰方法。根据直接序列扩频信号与窄带干扰信号在频域能量分布不同这一特性，利用快速傅里叶变换实现窄带干扰信号的实时检测和抑制。采用Verilog HDL硬件描述语言对算法进行基于FPGA实现的可综合的描述，最后在硬件测试平台上进行性能测试，测试结果表明带有窄带干扰的扩频序列通过窄带抑制模块后能够有效抑制窄带干扰。

Research of the Narrowband Interference Suppression algorithm for DSSS systems based on FFT

To overcome the narrowband interference (NBI) in the direct sequence spread spectrum (DSSS) system, an anti jam algorithm based on Fast Fourier Transform (FFT) is introduced. The narrowband interference is detected and suppressed by FFT based on its power distribution different from the DSSS signal in frequency domain. And the synthesizable algorithm is implemented by Verilog HDL to achieve in the FPGA. Simulation and hardware test show that anti-jam block can suppress NBI and get back the original signal.