function [start_sequence,delayvec_length,sync]=add_start_seq(max_delay,window_length,pulsetype,fs,T)%   [start_sequence,delay_length,sync]=add_start_seq(max_delay,window_length,pulsetype,fs,T,sync_factor)%%	Output:%	start_sequence      - the sequence before the first symbolblock %   delayvec_length     - length before the powerburst starts%   sync                - the synchronization sequence               %   %   Input:%	max_delay           - max length before the powerburst starts%   window_length       - length of each block%   pulsetype           - decides wich pulseshape to be used%   fs                  - sampling frequency  %   T                   - symbol period%   %%   Short Theoretical Background for the Function:%   %   Creates a startsequence to be added before the first symbolblock. The startsequence %   begins with a vector of zeros of random length according to delayvec_length. Then %   follows a powerburst, a gardblock, a synchronizationblock and a final gardblock.  %   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     %%% Function part of simulation for Space-Time%%% coding project, group Grey-2001.%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   Author: Fredrik & Karl%   Date: 2001-04-27%   Version: 1.0%   Revision (Name & Date & Comment):%   1.1 2001-05-02      longer sync and no gard after the sync-block%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%delayvec_length = max_delay + fs*T*ceil(max_delay*rand(1));delayvec = zeros(1,delayvec_length);power_burst = ones(1,fs*T*(window_length+10));sync_length = 2*window_length+10;sync_vec = bpsk(random_training(sync_length),0);gard_vec = zeros(1,window_length);%[power,t1]=pulseshape(power_burst,fs,pulsetype,T);power = carrier(power_burst,2500,fs,T);[sync,t1]=pulseshape(sync_vec,fs,pulsetype,T);[gard,t1]=pulseshape(gard_vec,fs,pulsetype,T);start_sequence = [delayvec power gard sync];