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function Datatx = genrand(NumSymb,wordsize,NumCarr,seed) 
%GENRAND Generates random data to transmit 
%	 Datatx = genrand(NumSymb,wordsize,NumCarr) 
% 
%	 Datatx = genrand(NumSymb,wordsize,NumCarr,seed) 
%	 If a seed is given the the random data will always 
%	 be the same when the same seed is given. 
%	 Note : the previous random seed is unaffected. 
 
if nargin == 4, 
	prevseed = rand('seed');	%Save the old random seed 
	rand('seed',seed);		%Set to new seed 
	Datatx = floor(rand(NumSymb,NumCarr)*(2^wordsize)); %Generate the data 
	rand('seed',prevseed);		%Restore the old seed 
else 
	Datatx = floor(rand(NumSymb,NumCarr)*(2^wordsize)); %Generate the data 
end