Since the signal will not really have infinite bandwidth (instantaneous
transitions from one state to the next), the envelope will not be of
constant modulus. The signal will be amplitude modulated with a
component due to the data transitions. Looking at the modulus or
modulus squared will reveal a line in the fft due to this amplitude
modulation.
Bob
David Scaperoth wrote:
hey all,
I am trying to demodulate a CPM (for now I'm doing it with 4-CPFSK
signal with Raised Cosine pusle shaping) signal without knowing the
symbol rate (i.e. the samples per symbol). does anyone know if this is
possible? Papers that I have read on timing recovery for CPM assume
that the symbol period is known.
thanks,
David
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