穩(wěn)態(tài)噪聲背景下加權(quán)Myriad濾波的遺傳算法實(shí)現(xiàn)
Weighted Myriad Filter Implementation with Genetic Algorithm in -Stable Noise Environments
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摘要: 該文利用遺傳算法具有全局最優(yōu)搜索的特點(diǎn),同時(shí),考慮到運(yùn)算復(fù)雜度問題,提出了用十進(jìn)制代替?zhèn)鹘y(tǒng)的二進(jìn)制進(jìn)行算子操作的遺傳算法,來獲得加權(quán)Myriad濾波器輸出。另外,針對在原自適應(yīng)權(quán)值訓(xùn)練算法中權(quán)值處于穩(wěn)定區(qū)后波動(dòng)仍較大的問題,分析了波動(dòng)存在的原因并對其進(jìn)行了改進(jìn).仿真結(jié)果表明,該方法在較多極值點(diǎn)的情況下,所有染色體均可快速收斂至全局極值點(diǎn),并且改進(jìn)后權(quán)值估計(jì)可使濾波效果有明顯改善。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.
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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. -
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