现代电子技术
現代電子技術
현대전자기술
Modern Electronics Technique
2015年
22期
12-13,16
,共3页
自适应滤波%归一化最小均方误差算法%变步长%稳态误差
自適應濾波%歸一化最小均方誤差算法%變步長%穩態誤差
자괄응려파%귀일화최소균방오차산법%변보장%은태오차
adaptive filtering%normalized least mean square error algorithm%variable step size%steady-state error
针对传统NLMS使用固定步长而出现的收敛速度和稳态误差的矛盾,提出一种改进的变步长NLMS算法.该算法建立了步长与误差的函数关系,使步长随着输出误差和噪声误差的变化而动态更新,从而降低稳态误差.理论分析和仿真结果表明,与现有NLMS算法相比,改进的算法具有更快的收敛速度和更低的稳态误差.
針對傳統NLMS使用固定步長而齣現的收斂速度和穩態誤差的矛盾,提齣一種改進的變步長NLMS算法.該算法建立瞭步長與誤差的函數關繫,使步長隨著輸齣誤差和譟聲誤差的變化而動態更新,從而降低穩態誤差.理論分析和倣真結果錶明,與現有NLMS算法相比,改進的算法具有更快的收斂速度和更低的穩態誤差.
침대전통NLMS사용고정보장이출현적수렴속도화은태오차적모순,제출일충개진적변보장NLMS산법.해산법건립료보장여오차적함수관계,사보장수착수출오차화조성오차적변화이동태경신,종이강저은태오차.이론분석화방진결과표명,여현유NLMS산법상비,개진적산법구유경쾌적수렴속도화경저적은태오차.
Aiming at the contradiction between convergence speed and steady state error of the traditional NLMS,an im-proved variable-step NLMS algorithm is proposed,in which the functional relationship between step-length and error is estab-lished,which makes dynamic update of step length changed with variation of output error and noise error to reduce steady-state error. The theoretical analysis and simulation results show that,compared with the existing NLMS algorithm,the improved algo-rithm has faster convergence speed and lower steady-state error.
