%main_STBC_MIMO_OFDM.m
%這是一個基于空時分組編碼的MIMO_OFDM通信系統的仿真設計。
%此系統包括QPSK調制解調，IFFT調制，空時編解碼，基于訓
%練符號的信道估計等通信模塊。

clear?all
close?all
clc

%+++++++++++++++++++++++++++變量++++++++++++++++++++++++++++++?
i=sqrt（-1）;?
IFFT_bin_length=512;?????????%傅立葉變換抽樣點數目??
carrier_count=100;???????????%子載波數目?
symbols_per_carrier=66;??????%符號數/載波?
cp_length=10;????????????????%循環前綴長度?
addprefix_length=IFFT_bin_length+cp_length;?
M_psk=4;?
bits_per_symbol=log2（M_psk）;?%位數/符號?
%[x1?x2;-x2*?x1*]?二天線發送矩陣??
%?O=[1?2;-2+j?1+j];???
%[x1?-x2?-x3;x2*?x1*?0;x3*?0?x1*;0?-x3*?x2*]?三天線發送矩陣
O=[1?-2?-3;2+j?1+j?0;3+j?0?1+j;0?-3+j?2+j];???
co_time=size（O1）;???????????????????????????????????????????????????????????????????
Nt=size（O2）;????????????????%發射天線數目??
Nr=2;????????????????????????%接收天線數目?
%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

%+++++++++++++++++++++++++++發射機++++++++++++++++++++++++++++++?
disp（‘--------------start-------------------‘）;
num_X=1;?
for?cc_ro=1:co_time?
????for?cc_co=1:Nt?
????????num_X=max（num_Xabs（real（O（cc_rocc_co））））;?
????end?
end?
?
co_x=zeros（num_X1）;?
?
for?con_ro=1:co_time????
????for?con_co=1:Nt?????%用于確定矩陣“O”中元素的位置，符號以及共軛情況?
????????if?abs（real（O（con_rocon_co）））~=0?
????????????delta（con_roabs（real（O（con_rocon_co））））=sign（real（O（con_rocon_co）））;??
????????????epsilon（con_roabs（real（O（con_rocon_co））））=con_co;?
????????????co_x（abs（real（O（con_rocon_co）））1）=co_x（abs（real（O（con_rocon_co）））1）+1;?
????????????eta（abs（real（O（con_rocon_co）））co_x（abs（real（O（con_rocon_co）））1））=con_ro;?
????????????coj_mt（con_roabs（real（O（con_rocon_co））））=imag（O（con_rocon_co））;?
????????end?
????end?
end?
?
eta=eta.‘;????????????????????????????????????????????????????????????????????????????
eta=sort（eta）;?
eta=eta.‘;?
?
%?坐標：?（1?to?100）?+?14=（15:114）
carriers?=?（1:?carrier_count）?+?（floor（IFFT_bin_length/4）?-?floor（carrier_count/2））;
%?坐標?：256?-?（15:114）?+?1=?257?-?（15:114）?=?（242:143）?
conjugate_carriers=IFFT_bin_length-carriers+2;??????????????????????????????????????????
tx_training_symbols=training_symbol（Ntcarrier_count）;?
baseband_out_length?=?carrier_count?*?symbols_per_carrier;?
?
snr_min=3;?????????????????????????????????????%最小信噪比????
snr_max=15;????????????????????????????????????%最大信噪比?
graph_inf_bit=zeros（snr_max-snr_min+12Nr）;???%繪圖信息存儲矩陣?
graph_inf_sym=zeros（snr_max-snr_min+12Nr）;??
?
for?SNR=snr_min:snr_max??????????????????????
??clc?
??disp（‘Wait?until?SNR=‘）;disp（snr_max）;?
??SNR?
??n_err_sym=zeros（1Nr）;?
??n_err_bit=zeros（1Nr）;?
??Perr_sym=zeros（1Nr）;?
??Perr_bit=zeros（1Nr）;?
??re_met_sym_buf=zeros（carrier_countsymbols_per_carrierNr）;?
??re_met_bit=zeros（baseband_out_lengthbits_per_symbolNr）;??
??
??%生成隨機數用于仿真
??baseband_out=round（rand（baseband_out_lengthbits_per_symbol））;??
??%二進制向十進制轉換?
??de_data=bi2de（baseband_out）;?
??%PSK調制?
??data_buf=pskmod（de_dataM_psk0）;??????????????????????????????
??carrier_matrix=reshap

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2009-04-08?13:11??MIMO通信系統\
?????文件???????10803??2009-03-22?23:14??MIMO通信系統\main_STBC_MIMO_OFDM.m
?????文件???????62976??2009-03-22?10:55??MIMO通信系統\STBC_MIMO_OFDM?源程序.doc
?????文件?????????933??2009-03-21?13:24??MIMO通信系統\training_symbol.m