function?[recv_signal?]?=?channel（?transmit_signalh_time?ch?N_Tx_ant?N_Rx_ant?...
??????????????????????var_noiseN_subcPrefixRatioN_symTurnOn_Channel）

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?多徑多天線信道
%?得到經過信道后的接收信號recv_signal

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

if?TurnOn_Channel?;%??if?rayleigh?channal
len?=?length（transmit_signal）?+?max（ch.Delay_sample）;%接收信號的長度，包含最大延遲數?（+?PreNoiseLen?+?PostNoiseLen）;
recv_signal?=?zeros（1len?N_Rx_ant）;%每個天線接收到的信號
tmp_recv?=?zeros（1length（transmit_signal）?+?max（ch.Delay_sample）N_Rx_ant）;
%?對每條接收天線的信號?是N_tx_ant個數據的疊加
for?n_r?=?1:N_Rx_ant
????tmp_signal?=?zeros（1length（transmit_signal）?+?max（ch.Delay_sample）?）;
????for?n_t?=?1:N_Tx_ant
???????????????
????????max_d?=?max（ch.Delay_sample）;
????????for?p?=?1:ch.N_path
????????????if?（N_Rx_ant?==?1）?&?（N_Tx_ant?~=?1）%?2X1
????????????????ch_coeff?=?h_time（p:n_t）;
????????????else
????????????????ch_coeff?=?h_time（p:（n_t-1）*N_Tx_ant?+?n_r）;%每一對天線的信道上每條徑的信道系數，每個系數只對應于每個OFDM符號
????????????end
????????????ch_coeff?=?reshape（?repmat（ch_coeff?N_subc*（1?+?PrefixRatio）1）?...
????????????????????????????????1N_subc*（1?+?PrefixRatio）*（N_sym）?）;%每條徑一幀內所含OFDM符號所有樣點對應的衰落系數
?????????????????????????%每一個OFDM符號持續時間內經歷相同的衰落系數，不同符號經歷不同的衰落系數?（多普勒頻移較小（<5Hz）時，一幀內所有符號相同的衰落系數）??????
??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
????????????delay?=?ch.Delay_sample（p）;%每條徑的延時
????????????
????????????%?然后把N_path條路徑延時疊加得到長度為length（transmit_signal）?+?max（ch.Delay_sample）的向量
????????????tmp_signal?=?tmp_signal?+?...
????????????????????[zeros（1?delay）??transmit_signal（1:n_t）.*ch_coeff??zeros（1max_d?-?delay）];%一對天線信道上經歷多徑時延和瑞利衰落后的信號
???????end

????%?把不同發送天線的信號疊加
????tmp_recv（1:n_r）?=?tmp_recv（1:n_r）?+?tmp_signal;%n_r個接收天線的循環
?
????end
end

%?在每條接收天線的信號加噪聲
recv_signal?=?tmp_recv?;
noise?=?sqrt（var_noise）*（?randn（1lenN_Rx_ant）?+?j*randn（1lenN_Rx_ant）?）;%復噪聲序列
recv_signal?=?recv_signal?+?noise;
%recv_signal?=?awgn?（recv_signalSNR）;%直接利用dB信噪比添加高斯白噪聲
else?%?if?AWGN?channal
????recv_signal?=?zeros（1length（transmit_signal）?N_Rx_ant）;%每個天線接收到的信號
????for?n_r?=?1:N_Rx_ant????????
????????for?n_t?=?1:N_Tx_ant
????????recv_signal（1:n_r）?=?recv_signal（1:n_r）?+?transmit_signal（1:n_t）;
????????end
????end
???
???????????????
???noise?=sqrt（var_noise）*（?randn（1length（transmit_signal）N_Rx_ant）?+?j*randn（1length（transmit_signal）N_Rx_ant）?）;%復噪聲序列
???recv_signal?=?recv_signal?+?noise;
end
????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????3398??2009-09-21?18:40??STBC-2X1\BPSK-QPSK-2X1.fig

?????文件???????3034??2009-10-09?10:12??STBC-2X1\channel.m

?????文件???????8281??2009-10-09?10:33??STBC-2X1\main.m

?????文件????????841??2009-10-09?10:12??STBC-2X1\Tap_Rayleigh_Jakes.m

?????文件???????3600??2009-09-16?16:15??STBC-2X1\time_channel_para.m

?????文件???????1541??2009-10-09?09:43??STBC-2X1\to_freq_channel.m

?????目錄??????????0??2009-10-09?09:53??STBC-2X1

-----------?---------??----------?-----??----

????????????????20695????????????????????7