opt_dfe.m

来自「基于Matlab」· M 代码 · 共 68 行

% opt_dfe Computes MMSE of T/2-spaced feedforward equalizers (FSE) 
%                 and T-spaced decision feedback equalizers  (DFE) 
%                 for a T/2-spaced complex FIR channel at a certain 
%                 SNR (dB) of AWGN and a unit power iid source given 
%                 cursor delays for various choices of FSE/DFE length  
%                 adding up to a total length Nfd 
% 
%                 [mmse] = opt_dfe(c,snrdb,Nfd,delay,pdelay,spacing,fig_menu,h_msg)
%   
%                 returns:
%                            mmse   :   Biased Minimum Mean Square Error
%                                       for every design attempted
%                 given:    
%                            c      :   channel
%                            snrdb  :   SNR in dB
%                            Nfd    :   FSE+DFE length
%                            Nf     :   FSE length
%                            Nd     :   DFE length
%                            delay  :   range of cursor delay 
%                                       -1 for match channel cursor 
%                            pdelay :   processing delay
%                            spacing:   1 for BSE
%                                       1/2 for FSE
%                            fig_menu:  figure handle to update message
%                            h_msg:      message box 

function [MSE] = opt_dfe(c,snrdb,Nfd,Nf,Nd,delay,pdelay,spacing,fig_menu,h_msg)

if (isempty(Nfd))
   MSE=zeros(length(delay),1);
   i=1;
   for DELAY=delay,
      [h,f,dd,delta,m]=mmse_dfe(c,snrdb,Nf,Nd,DELAY,pdelay,0,spacing);
      MSE(i)=m;

      pdone=['SNR ', num2str(snrdb), '(dB): ',...
              num2str(round(100*i/length(delay))) '% done'];
      set(fig_menu,'HandleVisibility','on'); drawnow;
      set(h_msg,'BackgroundColor', [0 1 0]);
      set(h_msg,'FontAngle','normal', 'String',pdone); drawnow;
   
      i=i+1;
   end;

else 

   MSE=zeros(length(delay),Nfd);
   i=1;
   for DELAY=delay,
      j=1;
      for Nf=1:Nfd,
         Nd=Nfd-Nf;
         [h,f,dd,delta,m]=mmse_dfe(c,snrdb,Nf,Nd,DELAY,pdelay,0,spacing);
         MSE(i,j)=m;
         j=j+1;
      end;

      pdone=['SNR ', num2str(snrdb), '(dB): ',...
              num2str(round(100*i/length(delay))) '% done'];
      set(fig_menu,'HandleVisibility','on'); drawnow;
      set(h_msg,'BackgroundColor', [0 1 0]);
      set(h_msg,'FontAngle','normal', 'String',pdone); drawnow;

      i=i+1;
   end;

end;