| 查看: 1578 | 回复: 5 | ||||
| 当前主题已经存档。 | ||||
zzbei木虫 (正式写手)
|
[交流]
自适应matlab程序（LMS和RLS）
|
|||
|
%lms算法源程序 clear all close all %channel system order sysorder = 5 ; % Number of system points N=2000; inp = randn(N,1); n = randn(N,1); [b,a] = butter(2,0.25); Gz = tf(b,a,-1); %This function is submitted to make inverse Z-transform (Matlab central file exchange) %The first sysorder weight value %h=ldiv(b,a,sysorder)'; % if you use ldiv this will give h :filter weights to be h= [0.0976; 0.2873; 0.3360; 0.2210; 0.0964;]; y = lsim(Gz,inp); %add some noise n = n * std(y)/(10*std(n)); d = y + n; totallength=size(d,1); %Take 60 points for training N=60 ; %begin of algorithm w = zeros ( sysorder , 1 ) ; for n = sysorder : N u = inp(n:-1:n-sysorder+1) ; y(n)= w' * u; e(n) = d(n) - y(n) ; % Start with big mu for speeding the convergence then slow down to reach the correct weights if n < 20 mu=0.32; else mu=0.15; end w = w + mu * u * e(n) ; end %check of results for n = N+1 : totallength u = inp(n:-1:n-sysorder+1) ; y(n) = w' * u ; e(n) = d(n) - y(n) ; end hold on plot(d) plot(y,'r'); title('System output') ; xlabel('Samples') ylabel('True and estimated output') figure semilogy((abs(e))) ; title('Error curve') ; xlabel('Samples') ylabel('Error value') figure plot(h, 'k+') hold on plot(w, 'r*') legend('Actual weights','Estimated weights') title('Comparison of the actual weights and the estimated weights') ; axis([0 6 0.05 0.35]) % RLS 算法 randn('seed', 0) ; rand('seed', 0) ; NoOfData = 8000 ; % Set no of data points used for training Order = 32 ; % Set the adaptive filter order Lambda = 0.98 ; % Set the forgetting factor Delta = 0.001 ; % R initialized to Delta*I x = randn(NoOfData, 1) ;% Input assumed to be white h = rand(Order, 1) ; % System picked randomly d = filter(h, 1, x) ; % Generate output (desired signal) % Initialize RLS P = Delta * eye ( Order, Order ) ; w = zeros ( Order, 1 ) ; % RLS Adaptation for n = Order : NoOfData ; u = x(n:-1:n-Order+1) ; pi_ = u' * P ; k = Lambda + pi_ * u ; K = pi_'/k; e(n) = d(n) - w' * u ; w = w + K * e(n) ; PPrime = K * pi_ ; P = ( P - PPrime ) / Lambda ; w_err(n) = norm(h - w) ; end ; % Plot results figure ; plot(20*log10(abs(e))) ; title('Learning Curve') ; xlabel('Iteration Number') ; ylabel('Output Estimation Error in dB') ; figure ; semilogy(w_err) ; title('Weight Estimation Error') ; xlabel('Iteration Number') ; ylabel('Weight Error in dB') ; [ Last edited by 幻影无痕 on 2006-10-26 at 07:47 ] |
回复此楼» 收录本帖的淘帖专辑推荐
 source |
» 猜你喜欢
FileCode能看出啥？
已经有23人回复
-
应该是93bebmhtak前后十一个字符比较关键
已经有36人回复
-
关于Filecode分析方法
已经有9人回复
-
2019年青年基金涵评意见，大家看看几个A，几个B?
已经有10人回复
-
不应该看fileCode
已经有6人回复
-
好奇怪的filecode
已经有6人回复
-
长年满屏的广告，版主太不责任了。基金也等的急
已经有4人回复
-
filecode
已经有15人回复
-
职称评审，求友友推荐见刊最快的期刊
已经有4人回复
-
奇怪，两个人的filecode固定段从头到尾一模一样
已经有10人回复
太好了 2楼2006-05-09 07:56:42
0.5
 |
3楼2006-05-09 17:21:55
wanglong
铁杆木虫 (正式写手)
- 应助: 1 (幼儿园)
- 金币: 5612.6
- 红花: 1
- 帖子: 640
- 在线: 236小时
- 虫号: 92438
- 注册: 2005-09-09
- 性别: GG
- 专业: 大气与海洋光学
4楼2006-05-11 12:51:08
wanglong
铁杆木虫 (正式写手)
- 应助: 1 (幼儿园)
- 金币: 5612.6
- 红花: 1
- 帖子: 640
- 在线: 236小时
- 虫号: 92438
- 注册: 2005-09-09
- 性别: GG
- 专业: 大气与海洋光学
5楼2006-05-11 12:52:37
6楼2006-05-16 23:02:49
