摘要
在采用自适应技术抑制直接序列扩频通信窄带干扰过程中,针对频域快速(FastLMS,FLMS)算法收敛速度较慢的缺点,将频域快速算法与变步长技术相结合,提出了一种基于改进的Sigmoid函数的变步长频域自适应BLMS(Variablestep-sizeFLMS,VFLMS)算法.理论分析和计算机仿真结果表明:VFLMS算法除具有FLMS算法的优点外,还具有较快的收敛速度和良好的收敛精度,可以有效地抑制直扩系统中的窄带干扰.
In the process of suppressing narrowband interference in DS-SS system by using adaptive technique, aiming at the disadvantage of slow convergence rate in frequency domain BLMS algorithm, combining frequency domain BLMS fast algorithm with variable step-size technique, a variable step-size adaptive BLMS algorithm in frequency domain is presented based on an improved Sigmoid function. Theoretic analysis and compute simulation indicate that the new algorithm not only has advantages of original frequency domain BLMS algorithm but also has fast convergence rate and better convergence precision, and can effectively suppress narrowband interference.
出处
《大庆石油学院学报》
CAS
北大核心
2006年第2期103-104,108,共3页
Journal of Daqing Petroleum Institute
关键词
直接序列扩频
频域BLMS算法
变步长
窄带干扰
direct-sequence spread-spectrum
frequency domain BLMS algorithm
variable step size
narrowband interference
