amodce.hlp

数字通信第四版原书的例程

amdsb-tc_help_begin
AMODCE Complex envelope of AM double sideband with transmission carrier.
       Y = AMODCE(X, Fs, METHOD), METHOD = 'am' or 'amdsb-tc', outputs the
       complex envelope of the modulation for signal X by using AM-DSB-TC
       method. The input signal X and the output signal Y have sample 
       frequency Fs (Hz). An offset signal OFFSET = abs(min(X)) will be
       subtracted before the modulation. When Fs is a two element vector,
       the second element is the initial phase in the carrier signal.

       Y = AMODCE(X, Fs, METHOD, OFFSET), METHOD = 'am' or 'amdsb-tc'
       specifies the offset value.
amdsb-tc_help_end

amdsb-sc_help_begin
AMODCE Complex envelope of AM double sideband suppressed carrier.
       Y = AMODCE(X, Fs, METHOD), METHOD = 'amdsb-sc', outputs complex
       envelope of the modulation for signal X by using AM-DSB-SC method.
       The input signal X and the output signal Y have sample frequency Fs.
       When Fs is a two element vector, the second element is the initial
       phase in the carrier signal.
amdsb-sc_help_end

amssb_help_begin
AMODCE Complex envelope of AM single sideband suppressed carrier.
       Y = AMODCE(X, Fs, METHOD), METHOD = 'amssb', outputs complex envelope
       of the modulation for signal X by using AM-SSB method. The input
       signal X and the output signal Y have sample frequency Fs (Hz). When Fs
       is a two element vector, the second element is the initial phase in the
       carrier signal. 

       Y = AMODCE(X, Fs, METHOD), METHOD = 'amssb/time' uses the time domain
       Hilbert filter. The Hilbert filter used in this format is the default
       filter in using [num, den] = hilbiir(1/Fs).

       Y = AMODCE(X, Fs, METHOD, NUM, DEN), METHOD = 'amssb/time' specifies
       the numerator NUM and denominator DEN of the Hilbert filter. A Hilbert
       filter can be designed by using
             [NUM, DEN] = HILBIIR(1/Fs, DELAY, BANDWIDTH, TOL)
       Please see HILBIIR for more information.
amssb_help_end

qam_help_begin
AMODCE Complex envelope of QAM.
       Y = AMODCE(X, Fs, METHOD), METHOD = 'qam', outputs complex envelope of
       the modulation for signal X by using QAM method. The input signal X and
       the output signal Y have sample frequency Fs (Hz). When Fs is a two
       element vector, the second element is the initial phase in the carrier
       signal. The input signal X must be a matrix with even number of columns.
       Output Y(:, i) is the modulated output of the in-phase Y(:, 2*i-1) and
       quadrature Y(:, 2*i) components of the signal.
qam_help_end

fm_help_begin
AMODCE Complex envelope of FM.
       Y = AMODCE(X, Fs, METHOD), METHOD = 'fm', outputs complex envelope of 
       the modulation for signal X by using FM method. The input signal X and
       the output signal Y have sample frequency Fs (Hz). When Fs is a two
       element vector, the second element is the initial phase in the carrier
       signal. Note that the modulated signal has bandwidth max(X).
fm_help_end

pm_help_begin
AMODCE Complex envelope of PM
       Y = AMODCE(X, Fs, METHOD), METHOD = 'pm', outputs complex envelope of
       the modulation for signal X by using PM method. The input signal X and
       the output signal Y have sample frequency Fs (Hz). When Fs is a two
       element vector, the second element is the initial phase in the carrier
       signal.
pm_help_end

Wes Wang 9/30/95