function urate=raw2user(rawrate)
%% ===========================================================================
%raw2user - Calculates the user bit-rate for ADSL given the "raw"
%           line rate
% Parameter:    rawrate   	The line rate before overhead in
%                               coding and transport
%
% Returns:      urate    	User bitrate
% Example(s):
%
% Algorithmic details:
%
% Reference:
%   ETSI TM6 ADSL-EED4
%% ===========================================================================

%% ===========================================================================
% Copyright (C) 
%      2001-2002 by Forschungszentrum Telekommunikation Wien, Austria;
%                                                     All rights reserved. 
% Description   : ADSL performance simulations
%
% Project       : B1, FTW
% Author(s)     : Tomas Nordstrom (Tomas.Nordstrom@FTW.at)
%
% CVS:       $Id: raw2user.m,v 1.2 2002/06/05 15:25:33 tono Exp $
%% ===========================================================================
% Change History
%      2001-08-24 (ToNo) Created
%      2002-03-21 (ToNo) Do not allow the rate to become negative
%% ===========================================================================
    
framingoh                   = 0.032;  % Framing overhead of 32kbit/s
rsoh                        = 1.13;   % Read-Solomon overhead of 16%

lowrateoh                   = 0.064;  % R-S overhead of 32kbit/s + framingoh

rnorm = rawrate/rsoh-framingoh;
rlow  = rawrate-lowrateoh;

urate=min(rnorm,rlow);
urate=max(0,urate);