基于快速遗传算法的固定阶H_2/H_∞自适应噪声抵消器  

Genetic Algorithm Approach to Mixed Fixed H_2/H_∞ Optimal Adaptive Noise Cancellation

作　　者：伦淑娴[1] 张化光[1] 

机构地区：[1]东北大学信息科学与工程学院

出　　处：《仪表技术与传感器》2003年第11期16-18,共3页Instrument Technique and Sensor

基　　金：国家自然科学基金 (6 0 2 740 1 7);沈阳市科技攻关项目(1 0 2 3 0 90 -2 -0 0 )资助

摘　　要：讨论了混合型固定阶H2/H∞自适应噪声抵消器的设计方法。其不仅能充分利用H2设计的最优性,而且能利用H∞设计的鲁棒性,克服了信号处理中存在模型扰动和噪声的不确定性等问题。固定阶次的H2/H∞自适应噪声抵消器的设计方法是从工程实践的观点出发,不仅实现简单,而且节省运行时间。采用快速遗传算法获取自适应噪声抵消器的系数。仿真结果表明:该方法设计的噪声抵消器即使噪声特性发生改变,而滤波器的结构及参数不变时,其去噪效果仍然良好;同时,该方法可以用于多路信号和复杂信号的噪声消除。The mixed H2/H∞ optimal adaptive noise cancellation is proposed to achieve the H2 optimal recontruction and a desired robust against the effect of uncertainties in signal processing from the H∞ norm perspective.However,the conventional mixed H2/H∞ optimal adaptive noise cancellation are very complicated and are not practical for industrial applications.For simplicity of implementation and conservation of operation time,the fixedorder mixed H2/H∞ optimal adaptive noise cancellation is design from the practical design perspective.In order to avoid the trap of local minima when using other searching algorithm such as the gradientbased algorithm and the random searching algorithm,a design method based on the genetic algorithm is introduced to treat the nonlinear optimization of the the fixedorder mixed H2/H∞ optimal adaptive noise cancellation.Simulation results indicate that the geneticbased design algorithm converge exponentially,and the reconstruction perfomance is acceptable even if the coefficients of the noise cancellation is fixed.At the same time,the niose cancellation based on this method can also be used in muitisensor signals and complicated signal processing.

关 键 词：噪声抵消 自适应滤波 遗传算法 H2/H∞滤波 信号处理 自适应滤波器 

分 类 号：TN713[电子电信—电路与系统]