modulate

(/tools/hpmatlab/toolbox/signal/modulate.m)

Function Synopsis

[y,t_out] = modulate(x,Fc,Fs,method,P1,P2)

Help text

MODULATE  Signal modulation for communications simulations.
	Y = MODULATE(X,Fc,Fs,METHOD,OPT) modulates the message signal X with a 
	carrier frequency Fc and sampling frequency Fs, using the modulation
	scheme in METHOD.  OPT is an extra sometimes optional parameter whose
	purpose depends on the modulation scheme you choose.

        METHOD              MODULATION SCHEME
	 'am',      Amplitude modulation, double side-band, suppressed carrier
	 'amdsb-sc' OPT not used.
	 'amdsb-tc' Amplitude modulation, double side-band, transmitted carrier
	            OPT is a scalar which is subtracted from X prior to 
	            multiplication by the carrier cosine.  It defaults to
	            min(min(X)) so the offset message signal is positive and
	            has a minimum value of zero.
	 'amssb'    Amplitude modulation, single side-band
	            OPT not used.
	 'fm'       Frequency modulation
	            OPT is a scalar which specifies the constant of frequency 
	            modulation kf.  kf = (Fc/Fs)*2*pi/max(max(abs(X))) by 
	            default for a maximum frequency excursion of Fc Hertz.
	 'pm'       Phase modulation
	            OPT is a scalar which specifies the constant of phase 
	            modulation kp.  kp = pi/max(max(abs(x))) by default for a 
	            maximum phase excursion of +/-pi radians.
	 'pwm'      Pulse width modulation
	            If you let OPT = 'centered', the pulses are centered on the
	            carrier period rather than being "left justified".
	 'ptm'      Pulse time modulation
	            OPT is a scalar between 0 and 1 which specifies the pulse 
	            width in fractions of the carrier period. It defaults to .1.
	 'qam'      Quadrature amplitude modulation
	            OPT is a matrix the same size as X which is modulated in 
	            quadrature with X.

	If X is a matrix, its columns are modulated.

	[Y,T] = MODULATE(...) returns a time vector the same length as Y.

	See also DEMOD, VCO.

Cross-Reference Information

abs            /tools/hpmatlab/toolbox/matlab/elfun/abs.m
any            /tools/hpmatlab/toolbox/matlab/ops/any.m
ceil           /tools/hpmatlab/toolbox/matlab/elfun/ceil.m
cos            /tools/hpmatlab/toolbox/matlab/elfun/cos.m
cumsum         /tools/hpmatlab/toolbox/matlab/datafun/cumsum.m
disp           /tools/hpmatlab/toolbox/matlab/general/disp.m
else           /tools/hpmatlab/toolbox/matlab/lang/else.m
elseif         /tools/hpmatlab/toolbox/matlab/lang/elseif.m
end            /tools/hpmatlab/toolbox/matlab/lang/end.m
error          /tools/hpmatlab/toolbox/matlab/lang/error.m
floor          /tools/hpmatlab/toolbox/matlab/elfun/floor.m
for            /tools/hpmatlab/toolbox/matlab/lang/for.m
hilbert        /tools/hpmatlab/toolbox/signal/hilbert.m
i              /tools/hpmatlab/toolbox/matlab/elmat/i.m
if             /tools/hpmatlab/toolbox/matlab/lang/if.m
imag           /tools/hpmatlab/toolbox/matlab/elfun/imag.m
input          /tools/hpmatlab/toolbox/matlab/lang/input.m
length         /tools/hpmatlab/toolbox/matlab/general/length.m
max            /tools/hpmatlab/toolbox/matlab/datafun/max.m
min            /tools/hpmatlab/toolbox/matlab/datafun/min.m
nargchk        /tools/hpmatlab/toolbox/matlab/lang/nargchk.m
nargin         /tools/hpmatlab/toolbox/matlab/elmat/nargin.m
nargout        /tools/hpmatlab/toolbox/matlab/elmat/nargout.m
ones           /tools/hpmatlab/toolbox/matlab/elmat/ones.m
pi             /tools/hpmatlab/toolbox/matlab/elmat/pi.m
rem            /tools/hpmatlab/toolbox/matlab/elfun/rem.m
return         /tools/hpmatlab/toolbox/matlab/lang/return.m
sin            /tools/hpmatlab/toolbox/matlab/elfun/sin.m
size           /tools/hpmatlab/toolbox/matlab/general/size.m
zeros          /tools/hpmatlab/toolbox/matlab/elmat/zeros.m

moddemo        /tools/hpmatlab/toolbox/signal/moddemo.m
vco            /tools/hpmatlab/toolbox/signal/vco.m