time domain plot from built in 'fskmod' function

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roopa bayareddy
roopa bayareddy 2012-2-16
编辑： Walter Roberson 2015-8-19
hi.....
am trying for obtaining time domain plot of the results from the built in 'fskmod'function.....
M = 4; freqsep = 8; nsamp = 8; Fs = 32;
x = randint(1000,1,M); % Random signal
y = fskmod(x,M,freqsep,nsamp,Fs); % Modulate.
ly = length(y);
% Create an FFT plot.
freq = [-Fs/2 : Fs/ly : Fs/2 - Fs/ly];
Syy = 10*log10(fftshift(abs(fft(y))));
plot(freq,Syy)
i want the plot of modulated signal.....i.e. QFSK with 4 distinct carriers.

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