计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2014年
6期
210-212,218
,共4页
Fast独立分量分析(ICA)%牛顿法%弦截法%最速下降法%负熵
Fast獨立分量分析(ICA)%牛頓法%絃截法%最速下降法%負熵
Fast독립분량분석(ICA)%우돈법%현절법%최속하강법%부적
Fast Independent Component Analysis(ICA)%Newton method%string section method%the steepest descent method%negative entropy
独立分量分析是目前盲源分离算法中最常用的一种方法,其中快速独立分量分析(FastICA)以其收敛速度快而被广泛应用,但FastICA对初始值的选择比较敏感,而且在使用牛顿迭代法时,每迭代一步都需要计算一次函数值和一次导数值,当函数比较复杂时,计算它的导数值往往不方便,用单点弦截法进行迭代,将最速下降法与单点弦截法结合,在保证分离效果的同时使FastICA的迭代次数减少,同时使计算式更加简洁,而且减小了对初始值的敏感性,仿真实验验证了其有效性。
獨立分量分析是目前盲源分離算法中最常用的一種方法,其中快速獨立分量分析(FastICA)以其收斂速度快而被廣汎應用,但FastICA對初始值的選擇比較敏感,而且在使用牛頓迭代法時,每迭代一步都需要計算一次函數值和一次導數值,噹函數比較複雜時,計算它的導數值往往不方便,用單點絃截法進行迭代,將最速下降法與單點絃截法結閤,在保證分離效果的同時使FastICA的迭代次數減少,同時使計算式更加簡潔,而且減小瞭對初始值的敏感性,倣真實驗驗證瞭其有效性。
독립분량분석시목전맹원분리산법중최상용적일충방법,기중쾌속독립분량분석(FastICA)이기수렴속도쾌이피엄범응용,단FastICA대초시치적선택비교민감,이차재사용우돈질대법시,매질대일보도수요계산일차함수치화일차도수치,당함수비교복잡시,계산타적도수치왕왕불방편,용단점현절법진행질대,장최속하강법여단점현절법결합,재보증분리효과적동시사FastICA적질대차수감소,동시사계산식경가간길,이차감소료대초시치적민감성,방진실험험증료기유효성。
Independent Component Analysis(ICA)is the blind source separation algorithm which is one of the most com-monly used methods. And the Fast Independent Component Analysis(FastICA)with its convergence speed is widely used. But FastICA is sensitive to the choice of initial value, and in the use of Newton iterative method, each iteration step is needed to calculate a function value and a derivative value. When the function is more complex, computing its derivatives is often not convenient. This paper uses the single point string section method to iterate. Combining the steepest descent method with the single point string section method, while ensuring the separation effect, it makes FastICA iterative times reduce. At the same time it makes the calculation type more concise, and reduces the sensitivity to the initial value.