function [indata_est,training1_est, training2_est]=detector(inphase_symbols,training_length1,training_length2,model)%   [indata_est,training1_est, training2_est]=detector(inphase_symbols,training_length1,training_length2,model)   %%	Output:%	indata_est          - Estimated bits {0,1}%   training1_est       - Estimated training bits sequence 1%   training2_est	    - Estimated training bits sequence 2
%
%   Input:
%   inphase_symbols     - Downsampled inphase component %   training_length1    - Length of training sequence 1%   training_length2 	- Length of training sequence 2
%   model			    - 0: no Alamouti (only 1 antenna), 1: Alamouti	 
%%   Short Theoretical Background for the Function:%   %   Estimates the received bits from the inphase-component of %   the received BPSK-symbols. %   symbols < 0 => data_est = 0%   symbols > 0 => data_est = 1%   this is done by taking sign of inphase_symbols which gives%   -ones and ones. By adding one and dividing by two zeros and ones are achieved.  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     %%% Function part of simulation for Space-Time%%% coding project, group Grey-2001.%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   Author:  Fredrik Hansson%   Date:    2001-03-22%   Version: 1.1%   Revision (Name & Date & Comment):%		SU 2001-03-25 Added parameteres: model and training_length2 for
%							the case of having two antennas sending with
%							one train-sequence each.%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%data_est = floor((sign(inphase_symbols)+1)/2);   if model == 0                                   % no alamouti coding 
   training1_est = data_est(1:training_length1);
   training2_est = 0;
   indata_est = data_est(training_length1+1:end);       elseif model == 1                               % alamouti coding
   training1_est = data_est(1:training_length1);
   training2_est = data_est(training_length1+1:training_length1+training_length2);
   indata_est = data_est(training_length1+training_length2+1:end);
end