摘要
在接收端通过频域干扰抑制技术,去除窄带干扰能量,从而使直接扩频调制的抗窄带干扰能力得到明显的改善。在直接扩频通信系统中,基于傅里叶变换的门限估计常用的有N-sigma法、λ算法和中值滤波3种。对其进行了详细的理论分析,并进行了MATLAB仿真对比,其结果表明3种方法都能使窄带干扰得到一定抑制,但其硬件实现的难易不同。
The capacity of direct-sequence spread-spectrum modulation to reject narrow-band interference can be significantly improved by eliminating narrow-band energy at the receiver in a process called frequency excision. In the Direct Spread Spectrum System, there are three usual algorithms for estimating the weighting based on DFT： N-sigma, algorithms, median filter. Theoretical analysis and MATLAB simulations prove that the three methods all can suppress the narrow-band interference in a certain extent, but they are differ from the difficulties of hardware implementing.
出处
《无线电工程》
2007年第6期35-36,59,共3页
Radio Engineering
