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Phase modulation
y = pmmod(x,Fc,Fs,phasedev)
y = pmmod(x,Fc,Fs,phasedev,ini_phase)
y = pmmod(x,Fc,Fs,phasedev) modulates the message signal x using phase modulation.
y
x
Fc
Fs
phasedev
example
y = pmmod(x,Fc,Fs,phasedev,ini_phase) specifies the initial phase of the modulated signal in radians.
ini_phase
collapse all
Set the sample rate. To plot the signals, create a time vector.
fs = 50; t = (0:2*fs+1)'/fs;
Create a sinusoidal input signal.
x = sin(2*pi*t) + sin(4*pi*t);
Set the carrier frequency and phase deviation.
fc = 10; phasedev = pi/2;
Modulate the input signal.
tx = pmmod(x,fc,fs,phasedev);
Pass the signal through an AWGN channel.
rx = awgn(tx,10,'measured');
Demodulate the noisy signal.
y = pmdemod(rx,fc,fs,phasedev);
Plot the original and recovered signals.
figure; plot(t,[x y]); legend('Original signal','Recovered signal'); xlabel('Time (s)') ylabel('Amplitude (V)')
Input signal, specified as a vector or matrix of positive integers. If x is a matrix, pmmod processes the columns independently.
pmmod
Example: sin(2*pi*t) + sin(6*pi*t)
sin(2*pi*t) + sin(6*pi*t)
Data Types: double
double
Carrier frequency, specified as a positive scalar.
Sample rate, specified as a positive scalar. Fs must be at least 2*Fc.
[]
Initial phase of the modulated signal (in radians), specified as a real scalar.
Example: pi/4
pi/4
Phase deviation, specified as a positive scalar in radians.
PM-modulated signal, returned as a vector or a matrix. The columns of y represent independent channels.
Data Types: double | single Complex Number Support: Yes
single
Introduced before R2006a
pmdemod | fmmod | fmdemod
pmdemod
fmmod
fmdemod
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