稳态噪声背景下加权Myriad滤波的遗传算法实现
Weighted Myriad Filter Implementation with Genetic Algorithm in -Stable Noise Environments
-
摘要: 该文利用遗传算法具有全局最优搜索的特点,同时,考虑到运算复杂度问题,提出了用十进制代替传统的二进制进行算子操作的遗传算法,来获得加权Myriad滤波器输出。另外,针对在原自适应权值训练算法中权值处于稳定区后波动仍较大的问题,分析了波动存在的原因并对其进行了改进.仿真结果表明,该方法在较多极值点的情况下,所有染色体均可快速收敛至全局极值点,并且改进后权值估计可使滤波效果有明显改善。Abstract: A novel algorithm is proposed based on the genetic theory, which has global optimum searching characteristic. Meanwhile, considering its computational cost, decimal code, not binary one is used in operation of the operators. Moreover, a modified adaptive weights training algorithm is also used to resolve the weights fluctuant problem in stable range. Numerical simulations demonstrate that tlie genetic algorithm can converge at the global extremum quickly, and that weights estimation with the modified adaptive weights training algorithm have a more stable range, and the filtering performance has been improved obviously.
-
Gonzalez J G, Arce G R. Weighted Myriad filters, a robust filtering framework derived from alpha-stable distribution. IEEE Proc., ICASSP, Atlanta, GA, 1996: 216-220.[2]Tsakalides P, Nikias C L. Maximum likelihood localization of sources in noise modeled as a stable process. IEEE Trans. on Signal Processing, 1995, SP-43(2): 2700-2713.[3]Tsihrintzis G A, Nikias C L. Performance of optimum and suboptimum receivers in the presence of impulsive noise modeled as an alpha-stable process. IEEE Trans. on Comm., 1995, COM-43(2):904-914.[4]Tsihrintzis G A, Nikias C L. Fast estimation of the parameters of alpha stable impulsive interference. IEEE Trans. on Signal Processing, 1996, SP-44(6): 1492-1503.[5]Kalluri S, Arce G R. Fast algorithms for weighted Myriad computation by fixed point search.IEEE Trans. on Signal Processing, 2000, SP-48(1): 159-171.[6]Yan K K, Lu Y L. Sidelobe reduction in array-pattern synthesis using genetic algorithm. IEEE Trans. on Antennas Propagation, 1997, AP-45(3): 1011-1016.[7]Kalluri S, Arce G R. Adaptive weighted Myriad filter algorithms for robust signal processing in a-stable noise environments. IEEE Trans. on Signal Processing, 1998, SP-46(2): 322-332. -
计量
- 文章访问数: 2248
- HTML全文浏览量: 103
- PDF下载量: 656
- 被引次数: 0
下载:
