anaqpsk

Purpose

Quaternary Phase Shift Keyed (QPSK) signal.

Synopsis

[y,pm0] = anaqpsk(N)
[y,pm0] = anaqpsk(N,ncomp)
[y,pm0] = anaqpsk(N,ncomp,f0)

Description

anaqpsk returns a complex phase modulated signal of normalized frequency f0, whose phase changes every ncomp point according to a discrete uniform law, between the values (0, pi/2, pi, 3*pi/2). Such signal is only 'quasi'-analytic.

Name	Description	Default value
N	number of points
ncomp	number of points of each component	N/5
f0	normalized frequency	0.25
y	signal
pm0	initial phase of each component

Example

         [signal,pm0]=anaqpsk(512,64,0.05); 
         subplot(211); plot(real(signal)); 
         subplot(212); plot(pm0);

See Also

anafsk, anabpsk, anaask.

Reference

[1] W. Gardner Introduction to Random Processes, with Applications to Signals and Systems, 2nd Edition, McGraw-Hill, New-York, p. 362 ,1990.

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