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function sim_state = SimulateOutage( sim_param, sim_state, code_param )
% SimulateOutage runs a single information outage probability simulation.
%
% The calling syntax is:
% sim_state = SimulateOutage( sim_param, sim_state, code_param )
%
% sim_param = A structure containing simulation parameters.
% sim_state = A structure containing the simulation state.
% code_param = A structure contining derived information.
%
% Copyright (C) 2005-2007, Matthew C. Valenti and Tarik Ghanim
%
% Last updated on December 7, 2007
%
% Function SimulateOutage is part of the Iterative Solutions Coded Modulation
% Library (ISCML).
%
% The Iterative Solutions Coded Modulation Library is free software;
% you can redistribute it and/or modify it under the terms of
% the GNU Lesser General Public License as published by the
% Free Software Foundation; either version 2.1 of the License,
% or (at your option) any later version.
%
% This library is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
% Lesser General Public License for more details.
%
% You should have received a copy of the GNU Lesser General Public
% License along with this library; if not, write to the Free Software
% Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
% load AWGN simulation
if(sim_param.mod_order > 0)
input_file = load(code_param.input_filename); % changed 12/7/07
capacity_AWGN = input_file.save_state.capacity_avg * log2(sim_param.mod_order);
EsNodB_AWGN = input_file.save_param.SNR; % assume SNR is Es/No in dB
EsNo_AWGN = 10.^(EsNodB_AWGN/10);
% Determine the slope of the capacity curve
last_index = length( capacity_AWGN );
slope = ( capacity_AWGN(2:last_index) - capacity_AWGN(1:last_index-1) )./( EsNo_AWGN(2:last_index) - EsNo_AWGN(1:last_index-1) );
end
% Initialize variables
rate = sim_param.rate;
if ( sim_param.SNR_type(2) == 'b' ) % Eb/No
EbNo = 10.^(sim_param.SNR/10);
EsNo = EbNo.*rate;
else % Es/No
EsNo = 10.^(sim_param.SNR/10);
end
L = sim_param.blocks_per_frame;
LL = L;
if ( sim_param.mod_order == -1)
% mod_order == -1 corresponds to 1-D Gaussian input
LL = L*2; % account for real symbols only
end
% determine combining type used
type = 0; % 'diversity'
if(strcmpi( sim_param.combining_type, 'code' ))
type = 1;
end
% temporary filename
tempfile = 'tempsave.mat';
% simulate
for snrpoint = 1:size(EsNo,2)
fprintf( strcat( '\n', sim_param.SNR_type, ' = %f dB\n'), sim_param.SNR(snrpoint) );
save_counter = 0;
while (( sim_state.trials( snrpoint ) < sim_param.max_trials( snrpoint ) )...
&( sim_state.frame_errors(snrpoint) < sim_param.max_frame_errors(snrpoint)))
% increment the trials counter
sim_state.trials(snrpoint) = sim_state.trials(snrpoint) + sim_param.trial_size;
save_counter = save_counter + sim_param.trial_size;
% Generate i.i.d. exponential SNRs (changed 12/7/07)
% gamma = EsNo(snrpoint)*exprnd(1,sim_param.trial_size,L);
gamma = -EsNo(snrpoint)*log(rand(sim_param.trial_size,L));
% If this is diversity combining, add the SNRs.
if ( type == 0 )
gamma = sum( gamma, 2 );
end
if(sim_param.mod_order > 0) % Modulation Constrained Input
inst_cap = 1/LL*CapacityTableLookup( EsNo_AWGN, capacity_AWGN, slope, gamma );
else % Unconstrained Gaussian Input
inst_cap = 1/LL*sum( log2( 1 + gamma ), 2 );
end
outages = sum(inst_cap<rate);
sim_state.frame_errors(snrpoint) = sim_state.frame_errors(snrpoint) + outages;
sim_state.FER(snrpoint) = sim_state.frame_errors(snrpoint)./sim_state.trials(snrpoint);
if outages
fprintf('x');
end
% determine if it is time to save (either (1) last error, (2) last
% frame, or (3) once per save_rate
condition1 = ( sim_state.trials(snrpoint ) >= sim_param.max_trials( snrpoint ) );
condition2 = ( sim_state.frame_errors(1, snrpoint) >= sim_param.max_frame_errors(snrpoint) );
% condition3 = ~mod( sim_state.trials(snrpoint), sim_param.save_rate );
condition3 = (save_counter > sim_param.save_rate );
time_to_save = condition1|condition2|condition3;
if ( time_to_save )
fprintf('.');
save_state = sim_state;
save_param = sim_param;
% Aded on April 22, 2006 in case system crashes during save
save( tempfile, code_param.save_flag, 'save_state', 'save_param');
% Store into local directory (if running locally)
if ( sim_param.compiled_mode )
copyfile( tempfile, sim_param.filename, 'f' );
end
movefile( tempfile, code_param.filename, 'f');
save_counter = 0;
end
end % Averaging loop over transmitted codewords(frames)
% halt if FER is low enough
if ( sim_state.FER(1, snrpoint) < sim_param.minFER )
break;
end
end % SNR loop
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