my_pskmod(x , m)

function y = my_pskmod(x , m)

%this is function for generating the phase shift keying modulation, where x
%is the signal to be modulated, and m is the type of modulation, like
%M-PSK, and m is a integer power of 2, y should be row vector. x is a row
%or coulmn integer vector and in between 0 to M-1.

%santosh shah, The LNM IIT Jaipur (India)([e-mail]) 24/04/07

%i have to check if M is equal to the power of 2 and x is in between 0 to
%M-1 so..
if log2(m)~= floor(log2(m))
    error('Please check the value of m that you have provided for type M-QAM.');
end

% i need to remove (x == floor(x)), if we want the value of x is in between anywhere 0 to M-1
if ~all(x >= 0 & x < m & x == floor(x))
    error('Please check the messege vector it must be in between 0 to M-1.');
end

%now generating the cancellation points
t = (0:m-1);
s  = exp(2*pi*t*(m-1)/m*(-i)); % taking the concept of cosx + i*sinx
y = s(x+1);