ip_06_08.m
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上传日期:2013-03-02
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- % MATLAB script for Illustrative Problem 6.8.
- echo on
- N=31;
- T=1;
- W=1/(2*T);
- n=-(N-1)/2:(N-1)/2; % the indices for g_T
- % The expression for g_T is obtained next.
- for i=1:length(n),
- g_T(i)=0;
- for m=-(N-1)/2:(N-1)/2,
- if ( abs((4*m)/(N*T)) <= W ),
- g_T(i)=g_T(i)+sqrt((1/W)*cos((2*pi*m)/(N*T*W)))*exp(j*2*pi*m*n(i)/N);
- end;
- echo off ;
- end;
- end;
- echo on ;
- g_T=real(g_T) ; % The imaginary part is due to the finite machine precision
- % Obtain g_T(n-(N-1)/2).
- n2=0:N-1;
- % Obtain the frequency response characteristics.
- [G_T,W]=freqz(g_T,1);
- % normalized magnitude response
- magG_T_in_dB=20*log10(abs(G_T)/max(abs(G_T)));
- % impulse response of the cascade of the transmitter and the receiver filters
- g_R=g_T;
- imp_resp_of_cascade=conv(g_R,g_T);
- % Plotting commands follow.