Substitutions in the Digital Example
Modification of Process
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Modifications in the Code
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Set the carrier signal's initial phase to phs, measured in radians.
| y = dmodce(x,Fd,[Fs phs],'psk',M);
z = ddemodce(y,Fd,[Fs phs],'psk',M);
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Use a lowpass filter after demodulating but before demapping. num and den are row vectors that give the coefficients, in descending order, of the numerator and denominator of the filter's transfer function.
| z = ddemodce(y,Fd,Fs,'psk',M,num,den);
(See also Filter Design Issues if you plan to use filters.)
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(ASK only) Use a Costas phase-locked loop.
| y = dmodce(x,Fd,Fs,'ask',M);
z = ddemodce(y,Fd,Fs,'ask/costas',M);
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(FSK only) Use noncoherent demodulation.
| y = dmodce(x,Fd,Fs,'fsk',M);
z = ddemodce(y,Fd,Fs,'fsk/noncoherence',M);
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