ask_help_begin
DMODCE Complex envelope of M-ary ASK modulation.
       Y = DMODCE(X, Fd, Fs, METHOD), METHOD = 'ask', outputs Y, the complex
       envelope of M-ary ASK modulated signal. The sample frequency for X is
       Fd (Hz). The sample frequency for Y is Fs (Hz). Fs / Fd must be a
       positive integer. The row size of the resulting signal Y is Fs / Fd
       times that of the original signal X. All elements in X are non-negative
       integers. The range of input integers is in [0, M-1]. M = 2^K such that
       max(X) < 2^K, where K is the minimum integer satisfies max(X) < 2^K.
       The peak value of the modulated signal is 1. When Fs is a two element
       vector, the second element is the initial phase in the modulation. 

       Y = DMODCE(X, Fd, Fs, METHOD, M), METHOD = 'ask', specifies that the 
       input digits are in range [0, M-1].

       DMODCE(METHOD, M), METHOD = 'ask', plots the ASK constellation.
ask_help_end

psk_help_begin
DMODCE Complex envelope of M-ary PSK modulation.
       Y = DMODCE(X, Fd, Fs, METHOD), METHOD = 'psk', outputs Y, the complex
       envelope of M-ary PSK modulated signal. The sample frequency for X is Fd (Hz).
       The sample frequency for Y is Fs (Hz). Fs / Fd must be a positive
       integer. The row size of the resulting signal Y is Fs / Fd times that 
       of the original signal X. All elements in X are non-negative integers.
       The range of input integers are in [0, M-1]. M = 2^K such that 
       max(X) < 2^K, where K is the minimum integer satisfies max(X) < 2^K.
       The peak value of the modulated signal is 1. When Fs is a two element
       vector, the second element is the initial phase in the modulation. 

       Y = DMODCE(X, Fd, Fs, METHOD, M), METHOD = 'psk', specifies that the 
       input digits are in range [0, M-1].

       DMODCE(METHOD, M), METHOD = 'psk', plots the PSK constellation.
psk_help_end

qask_help_begin
DMODCE Complex envelope of M-ary QASK modulation.
       Y = DMOD(X, Fd, Fs, METHOD), METHOD = 'qask', outputs Y, the 
       complex envelope of M-ary the QASK, square constellation modulated signal.
       X has sample frequency Fd (Hz). The function output Y has sample
       frequency Fs (Hz). Fs / Fd should be a positive integer. The row size
       of the resulting signal Y is Fs / Fd times that of the original signal
       X. All elements in X are non-negative integers. The range of input
       integers are in [0, M-1]. In which, M equals 2^K such that 
       max(X) < 2^K, where K is the minimum integer satisfies max(X) < 2^K.
       The peak value of the modulated signal is listed in the table below.
       When Fs is a two element vector, the second element is the initial
       phase in the modulation. 

       Y = DMODCE(X, Fd, Fs, METHOD, M), METHOD = 'qask', specifies that
       the input digits are in range [0, M-1].

       DMODCE(METHOD, M), METHOD = 'qask', plots the QASK square
       constellation. The maximum amplitudes in the constellation are as
       follows:
           M = 2,   maximum = 1;   M = 4,   maximum = 1;
           M = 8,   maximum = 3;   M = 16,  maximum = 3;
           M = 32,  maximum = 5;   M = 64,  maximum = 7;
           M = 128, maximum = 11;  M = 256, maximum = 15;

       Y = DMODCE(X, Fd, Fs, METHOD, In_Phase, Quad), METHOD = 'qask/arb',
       outputs Y, the complex envelope of a QASK arbitrary constellation
       modulated signal. The arbitrary constellation is defined in the
       variables In_Phase and Quad. The constellation point for message I is 
       defined by In_Phase(I+1) and Quad(I+1), which specify the in-phase 
       and quadrature component respectively.

       The user-defined arbitrary constellation of the QASK can be plotted by
       using DMODCE('qask/arb', In_phase, Quad).

       Y = DMODCE(X, Fd, Fs, METHOD, NIC, AIC, PIC), METHOD = 'qask/cir'
       outputs Y, the complex envelope of M-ary QASK circle constellation
       modulated signal. The number in circle, amplitude in circle, and
       a signature phase in circle are defined in NIC, AIC, and PIC
       respectively. The three vectors NIC, AIC and PIC have the same
       length. The constellation in each circle is evenly distributed in
       each circle with one of the points having its phase as the signature
       phase. When PIC is not given, PIC is assumed to be an all zero vector.
       When AIC is not given, the default value AIC = [1:length(NIC)] is
       used.

       The circle constellation of the QASK can be plotted by using
       DMODCE(METHOD, NIC, AIC, PIC).
qask_help_end

fsk_help_begin
DMODCE Complex envelope of M-ary FSK modulation.
       Y = DMODCE(X, Fd, Fs,METHOD), METHOD = 'fsk', outputs Y, the complex
       envelope of a FSK modulated signal. The sample frequency for X is
       Fd (Hz). The sample frequency for Y is Fs (Hz). Fs / Fd should be a
       positive integer. The row size of the resulting signal Y is Fs / Fd
       times that of the original signal X. All elements in X are non-negative
       integers. The range of input integers is in [0, M-1], in which M equals
       2^K such that max(X) < 2^K, where K is the minimum integer satisfies
       max(X) < 2^K. The peak value of the modulated signal is 1. When Fs
       is a two element vector, the second element is the initial phase in
       the modulation. The default tone space is TOEN = 2*Fd/M. The tone
       space is the frequency separation between successive frequencies.

       Y = DMODCE(X, Fd, Fs, METHOD, M), METHOD = 'fsk', specifies that the
       input digits is in range [0, M-1]. 

       Y = DMODCE(X, Fd, Fs, METHOD, M, TONE), METHOD = 'fsk', specifies the
       tone space TONE, the frequency separations between successive frequency
       in FSK.

       DMODCE(METHOD, M, TONE), METHOD = 'fsk', plots FSK constellation.
fsk_help_end

msk_help_begin
DMODCE Complex envelope MSK modulation.
       Y = DMODCE(X, Fd, Fs, METHOD), METHOD = 'msk', outputs Y, the complex
       envelope of the MSK modulated signal. The sample frequency for the
       input signal X is Fd (Hz). The sample frequency for the output signal
       Y is Fs (Hz). Fs / Fd must be a positive integer. The row size of the
       resulting signal Y is Fs / Fd times that of the input signal X. All
       elements in X are binary numbers. The peak value of the modulated
       signal is 1. When Fs is a two element vector, the second element is the
       initial phase in the modulation. The tone space is Fd. MSK is a special
       case of FSK. 

       Y = DMODCE(METHOD, Fd), METHOD = 'msk', plots msk constellation.
msk_help_end
sam_help_begin
DMODCE Map a sample frequency Fd column signal to a sample frequency Fs signal.
       Y = DMODCE(X, Fd, Fs, METHOD), METHOD = 'sample', takes the input
       signal X with sample frequency Fd (Hz) and outputs signal Y with sample
       frequency Fs (Hz). When X is a matrix, the function takes each column
       as individual signals. The output Y will have the same number of column
       numbers as X. Fs must be larger than Fd and Fs/Fd should be an integer.
       When Fd is a two element vector, the second element should be an
       integer, which means the offset timing is Fd(2)/Fs. The default offset
       is zero.
sam_help_end

Wes Wang 10/5/95