Phase Locked Loop I-Analog Communication-Matlab Codes, Exercises of Analog Communication

Download Phase Locked Loop I-Analog Communication-Matlab Codes and more Exercises Analog Communication in PDF only on Docsity! % Phase Locked Loop: close all % Input Arguments: t = 0:0.002:2; A = 10; % Amplitude of Message Signal wm = 2*pi*20; % Frequency of message signal fs = 500; % Corresponding Sampling frequency oi = 2; % phase shift in input filter_order = 70; % filter order of LPF wcut = (2*5)/(fs); % Cutoff frequency of LPF wc = 2*pi*40; % Free Running frequency of VCO e0 = 10 ; % Initialization for loop with a random value c = 1; % Constant multiple of e0 B = 10; % Amplitude of the signal generated by VCO % Working: % u --->(x)---->[ H(s) ]---+--> y % | | % ------[ VCO ]<----- % H(s) = Low Pass loop filter % VCO = Voltage Controlled Oscillator % (x) = A multiplier working as a phase detector % Input Signal: u=A*sin(wm*t); w=-250:(2*250)/1000:250; U=fftshift(abs(fft(u))); figure, plot(t(1:20),u(1:20)), title('Message Signal'),xlabel('time'),ylabel('Amplitude') figure, plot(w(501:1001),U(501:1001)), title('Spectrum of Message Signal'),xlabel('frequency (Hz)'),ylabel('Amplitude') a = length(u); for k=1:1000 % VCO: wt = wc*t(c*(e0)); v = B*cos(wt); % for plot of e0: x(k) = (oi-(c*e0)); y(k) = e0; % Multiplier: m0 = u.*v; % Low Pass Filter: Filter = fir1(filter_order,wcut,'low'); docsity.com