Quaternary Phase Shift Keying (QPSK) signal.
[Y,PM]=anaqpsk(N) [Y,PM]=anaqpsk(N,NCOMP) [Y,PM]=anaqpsk(N,NCOMP,F0)
number of points
number of points of each component (default: N/5)
normalized frequency. (default: 0.25)
signal
initial phase of each component (optional).
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.