?? tx_gen_preamble.m
字號:
function preamble = tx_gen_preamble(sim_options);
global sim_consts;
%Generate first ten short training symbols
short_tr = sim_consts.ShortTrainingSymbols;
% generate four short training symbols
short_tr_symbols = tx_freqd_to_timed(short_tr);
% Pick one short training symbol
Strs = short_tr_symbols(1:16);
% extend to ten short training symbols
short_trs=[Strs Strs Strs Strs Strs Strs Strs Strs Strs Strs];
short_trs_len=length(short_trs);
% next generate the two long training symbols
long_tr = sim_consts.LongTrainingSymbols;
long_tr_symbol = tx_freqd_to_timed(long_tr);
if ~sim_options.UseTxDiv
% single antenna preamble
% extend with the 2*guard interval in front and then two long training symbols
long_trs_signal = [long_tr_symbol(64-2*16+1:64) long_tr_symbol long_tr_symbol];
else
% generate the two antenna preamble,
% long training symbols are not transmitted simultaneously from both antennas to allow
% channel estimation in receiver
long_trs_signal(1,:) = sqrt(2)*[long_tr_symbol(64-16+1:64) long_tr_symbol ...
zeros(1,80)];
long_trs_signal(2,:) = sqrt(2)*[zeros(1,80) ...
long_tr_symbol(64-16+1:64) long_tr_symbol];
end
% concatenate first short training symbols and long training symbols
preamble(1,:) = [short_trs(1,:) long_trs_signal(1,:)];
% add the second antenna preamble
if sim_options.UseTxDiv
preamble(2,:) = [short_trs(1,:) long_trs_signal(2,:)];
end
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