QAM.rar_MATLAB 实现qam_qaM MATLAB_qam matlab实现

Ts = 1; % tinc = The number of points every Ts seconds tinc = 20; dt = Ts/tinc; t = 0:dt:16*Ts; wc = 2*pi*5; n = 4; % Generating x(t), a staircase waveform that repeats every 4Ts seconds x = zeros(length(t),1); for (i = 1:1:n) for (j = 1:1:n) x = x + (2*i-5)*(u_step(t,(i-1)*Ts+(j-1)*4*Ts) - u_step(t,i*Ts+(j-1)*4*Ts)); end; end; x(length(t)) = x(length(t)-1); x = x(:); % Generating y(t) t1 = 0.24*t; y = zeros(length(t),1); for (i = 1:1:n); y = y + (2*i-5)*(u_step(t1,(i-1)*Ts) - u_step(t1,i*Ts)); end; temp1 = cos(wc*t + pi/4); temp2 = sin(wc*t + pi/4); temp1 = temp1(:); temp2 = temp2(:); s = x.*temp1 - y.*temp2; % Plotting x(t) versus y(t) plot_pr(3); axis([-4 4 -4 4]); plot(x,y,'x'); xlabel('x(t)'); ylabel('y(t)'); axis; pause; % Plotting x(t) & y(t) subplot(211) plot(t,x); xlabel('t'); ylabel('x(t)'); subplot(212); plot(t,y); xlabel('t'); ylabel('y(t)'); pause; subplot(111); plot(t,s); xlabel('t'); ylabel('s(t)')