舰船电子工程
艦船電子工程
함선전자공정
Ship Electronic Engineering
2015年
9期
68-71
,共4页
自适应算法%回声消除%滤波器
自適應算法%迴聲消除%濾波器
자괄응산법%회성소제%려파기
adaptive algorithm%echo cancellation%filter
针对归一化最小均方（NLMS）算法应用在回声消除中的缺点，即收敛速度慢，对非平稳信号的自适应能力差等。论文引入成比例归一化最小均方（PNLMS）算法、成比例归一化最小均方改进型（PNLMS ＋＋）算法、仿射投影（APA）算法以及成比例仿射投影（PAPA）算法，仿真得到这几种算法的均方误差和系数误差曲线，比较这几种算法均方误差和系数误差曲线的收敛速度以及收敛水平，分析得出 PNLMS 算法、PNLMS ＋＋算法以及 PAPA 算法收敛速度最快，收敛水平最低，在回声消除应用中效果更好。
針對歸一化最小均方（NLMS）算法應用在迴聲消除中的缺點，即收斂速度慢，對非平穩信號的自適應能力差等。論文引入成比例歸一化最小均方（PNLMS）算法、成比例歸一化最小均方改進型（PNLMS ＋＋）算法、倣射投影（APA）算法以及成比例倣射投影（PAPA）算法，倣真得到這幾種算法的均方誤差和繫數誤差麯線，比較這幾種算法均方誤差和繫數誤差麯線的收斂速度以及收斂水平，分析得齣 PNLMS 算法、PNLMS ＋＋算法以及 PAPA 算法收斂速度最快，收斂水平最低，在迴聲消除應用中效果更好。
침대귀일화최소균방（NLMS）산법응용재회성소제중적결점，즉수렴속도만，대비평은신호적자괄응능력차등。논문인입성비례귀일화최소균방（PNLMS）산법、성비례귀일화최소균방개진형（PNLMS ＋＋）산법、방사투영（APA）산법이급성비례방사투영（PAPA）산법，방진득도저궤충산법적균방오차화계수오차곡선，비교저궤충산법균방오차화계수오차곡선적수렴속도이급수렴수평，분석득출 PNLMS 산법、PNLMS ＋＋산법이급 PAPA 산법수렴속도최쾌，수렴수평최저，재회성소제응용중효과경호。
According to the defects of the normalized least mean square(NLMS) algorithm when it is applied in the echo elimination ,the proportionate normalized least mean square(PNLMS ) algorithm ,the proportionate normalized least mean square(PNLMS + + ) algorithm ,the improved affine projection(APA) algorithm and the proportionate affine projection(PA‐PA) algorithm were introduced in this paper ,which were applied in the echo elimination .Firstly ,the derivations of formulas among these algorithms and the connections with each other were introduced .Then ,by setting the orders of FIR filters and different input signals ,the mean squared error and the coefficient error curve could be get by the simulation .The PNLMS al‐gorithm ,the PNLMS + + algorithm and the PAPA algorithm can be better applied in the echo cancellation ,which was veri‐fied by the comparison of the performance and the convergence speed of those algorithms .
