摘要： 在DSSS系统中，提出一种基于修正离散Chirp-Fourier变换(MDCFT)的扫频干扰自适应时变抑制算法。该算法采用MDCFT估计扫频干扰的参数，构造了实时性强的自适应时变干扰剔除器，推导了MDCFT检测扫频干扰的输出信噪比的闭合表达式。与Wigner-Hough变换(WHT)估计扫频干扰时的非线性损失相比，输出信噪比提高了3 dB，并给出了误码率的闭合表达式。数值仿真表明了理论分析的正确性和该方法的有效性。
关键词:
离散Chirp-Fourier变换,
自适应时变剔除器,
扫频干扰
Abstract: In DSSS communications system, this paper proposes an adaptive method for suppressing frequency sweeping interferences. The adaptive time-varying interference excision filter is constructed based on the interference parameter estimated by MDCFT. A closed form expression is found for the output of signal-to-noise ratio. Compared with the nonlinear loss of WHT, 3-dB is improved. The error probability in a closed form is expressed, and numerical simulation shows the exactness of the theoretical analysis and the validity of the method.
Key words:
discrete Chirp-Fourier transform,
adaptive time-varying excision,
sweeping interference
中图分类号:
夏彩杰;王爱华;安建平.
扫频干扰的自适应时变抑制研究
[J]. 计算机工程, 2008, 34(4): 37-39.
XIA Cai-jie; WANG Ai-hua; AN Jian-ping. Research on Adaptive Time-varying Suppression of Frequency Sweeping Interference[J]. Computer Engineering, 2008, 34(4): 37-39.