awgnbase.m

MATLAB-functions used in Space-Time Project Simulation

function [received]=awgnbase(trans,EbN0)

%   [received]=awgnbase(trans,EbN0)
%
%	Output:
%	received   - Received baseband signal
%   
%   trans      - Transmitted baseband signal
%   EbN0       - Eb/N0 
%   
%   Short Theoretical Background for the Function:
%
%   AWGN baseband channel. Adds complex-valued additive 
%   white gaussian noise.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
%%% Function part of simulation for Space-Time
%%% coding project, group Grey-2001.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%   Author:     Fredrik Hansson
%   Date:       2001-03-28
%   Version:    1.0
%   Revision (Name & Date):
%   1.1         FH 2001-04-01  EbN0 in normal scale (not dB!!!) 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%SNR = 2*(10^(EbN0/10));

pnorm = 1;               % normalized pulsshape?

sigma2 = pnorm * 1/(2*EbN0); % noise variance
n = sqrt(sigma2/2) * randn(size(trans)) +...
    j * sqrt(sigma2/2) * randn(size(trans)) ;
received = trans + n;