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% Program 2-4 
% comb.m 
% 
% Generate additive white gausian noise 
%  
% Programmed by H.Harada	 	 
%  
 
function [iout,qout] = comb (idata,qdata,attn) 
 
%****************** variables ************************* 
% idata : input Ich data 
% qdata : input Qch data 
% iout   output Ich data 
% qout   output Qch data 
% attn : attenuation level caused by Eb/No or C/N 
%****************************************************** 
 
iout = randn(1,length(idata)).*attn; 
qout = randn(1,length(qdata)).*attn; 
  
iout = iout+idata(1:length(idata)); 
qout = qout+qdata(1:length(qdata)); 
 
% ************************end of file***********************************