%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%LMS自適應濾波器性能分析?
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clear?
clc
close?all
%%%%%%%%%%%%%%參數設置%%%%%%%%%%%%%%%%%%%%%%%
w=3.2;
step_len=0.075;
variance_v=0.001;
repeat_times=200;
iteration_times=500;
filt_len=2;
delay=fix（filt_len/2）-1;
%%%%%%%%%%%%%%%%%%%%變量及數組初始化%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Chan_factor=（1+cos（2*pi*（[1:1:3]-2）/w））/2;
Square_err=zeros（repeat_timesiteration_times）;
%%%%%%%%%%%%%外循環，重復做repeat_timws次實驗，平均值%%%%%%%%%%%%%%%%
for?loop1=1:repeat_times
%%%%%%%%%%%%%%內循環變量及數組初始化%%%%%%%%%%%%%%%%%%%%%%%%
Source=zeros（iteration_times1）;
W=zeros（filt_len1）;
%%%%%%%%%%%%%內循環，做iteration_times次迭代%%%%%%%%%%%%%%%%%%%%%%%%%%%%
???for?i=1:iteration_times
%%%%%%%%%%%%%%信源，產生等概率分布的正負1%%%%%%%%%%%%%%%%%%%%%%%%%%%%
??????if?rand<0.5
??????????Source（i）=-1;
??????else
??????????Source（i）=1;
??????end
???end
%%%%%%%%%%%%%%信道，濾波和加噪聲%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
???Revdata=filter（Chan_factor1Source）+randn（iteration_times1）*sqrt（variance_v）;
%%%%%%%%%%%%%%均衡器，基于LMS算法%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%????
????for?loop2=1:iteration_times-filt_len+1
????????U=Revdata（loop2:loop2+filt_len-1）;
????????d=Source（loop2+delay）;
????????
????????e=d-W‘*U;
????????W=W+step_len*U*e;
????????
????????Square_err（loop1loop2）=e.^2;
????end
end
%%%%%%%%%%%%%%作圖，顯示結果%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Square_err_mean=sum（Square_err（::））/repeat_times;
semilogy（Square_err_mean）;
figure（2）;
stem（W）;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1586??2008-01-10?05:07??RLS與LMS算法分析及比較\LMSnew.m

?????文件???????1749??2007-12-23?22:36??RLS與LMS算法分析及比較\RLSnew.m

?????文件????????732??2007-12-24?04:42??RLS與LMS算法分析及比較\rls_lms.m

?????目錄??????????0??2008-11-27?13:11??RLS與LMS算法分析及比較

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?????????????????4067????????????????????4