function?[transmit_signal?training]?=?add_training（transmit_signalPrefixRatio...
????N_subcN_used?Idx_usedcp_len?N_Tx_antN_tran_sym）

%?1024點FFT的前導序列
%?多條天線的訓練序列（同步幀）各兩個OFDM符號
training?=?zeros（N_subcN_tran_symN_Tx_ant）;
%?產生偽隨機序列，放在訓練OFDM符號的導頻位置.
PN_seq?=?mseq（10?[1?2?6?10]?ones（110）?N_Tx_ant*3）;
PN_seq?=?2*PN_seq?-?1;

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?產生第1個訓練OFDM符號
Repeat?=?8;?%?為保證在時域上重復Repeat次?在頻域上兩個有數據的子載波間插（Repeat-1）個零
for?ant?=?1:N_Tx_ant
????real_part?=?PN_seq（?（ant-1）*N_Tx_ant?+?11:N_used/Repeat?）;?%?截取PN序列
????imag_part?=?PN_seq（?（ant-1）*N_Tx_ant?+?21:N_used/Repeat?）;
????
????tran_tmp1?=??sqrt（Repeat/2）?*?（?real_part?+?j?*?imag_part?）;
????tmp1?=?[?tran_tmp1?;?zeros（Repeat-1N_used/Repeat）?];
????tmp2?=?reshape（tmp1?N_used?1）;
????tmp3?=?[?tmp2（1:N_used/2）?;?flipud（tmp2（N_used/2?+?1:end））];
????training（Idx_used1ant）?=?tmp3;
end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?產生第2個訓練OFDM符號?在偶數的子載波上放偽隨機序列

Repeat?=?2;
for?ant?=?1:N_Tx_ant
????tran_tmp1?=?PN_seq（?2*N_Tx_ant?+?ant1:N_used/Repeat?）;?%?截取PN序列????
????tmp1?=?[?tran_tmp1?;?zeros（Repeat-1N_used/Repeat）?];
????tmp2?=?reshape（tmp1?N_used?1）;
????tmp3?=?[?tmp2（1:N_used/2）?;?flipud（tmp2（N_used/2?+?1:end））];
????training（Idx_used2ant）?=?tmp3;
end


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?產生時域訓練序列

syn_frame?=?sqrt（N_subc）?*?ifft（?fftshift（?training??1?）?）;
cp?=?syn_frame（N_subc?-?cp_len?+?1:N_subc?::）;
training_frame?=?[cp;syn_frame];
training_frame?=?reshape（training_frame[1?（N_subc?+?cp_len）*N_tran_sym?N_Tx_ant]）;

transmit_signal?=?[?training_frame?transmit_signal?];