function [msg_bit] = source
%

[K,D,N,G,N_t,N_r,L,C]= header;

% Qpsk M=2;N_t = 2;
M=2;
msg_bit =  randint(1,M*N*D);

% msg_bit = zeros(1,M*N*D);
% msg_bit(1,1:M*N*D) = randint(1,M*N*D);