function?output_frame?=?demodulation（input_modu?index）
%?demodulation?for?IEEE802.11a
%?Input:????input_modu?complex?values?representing?constellation?points
%???????????index
%?Output:???output_frame?output?bit?stream?（data?unit?is?one?bit）

%?In?this?version?increase?the?quatilization?levels?into?8.
%?note:?Matlab?index?starts?from?1
QAM_input_I?=?real（input_modu）;
QAM_input_Q?=?imag（input_modu）;
output_frame?=?zeros（1length（input_modu）*index）;
switch?index
case?1
????BPSK_Demodu_I?=?[0?1];??????%f（m）=（m+1）/2?+?1?so?I=-1?--->?1?I=1?--->?2
????idx?=?find（QAM_input_I>1）;
????QAM_input_I（idx）?=?1;
????idx?=?find（QAM_input_I<-1）;
????QAM_input_I（idx）?=?-1;
????output_frame?=?BPSK_Demodu_I（round（（QAM_input_I+1）/2）?+?1）;
case?2
????QPSK_Demodu_IQ?=?[0?1];?????%f（m）=（m+1）/2?+?1?so?I=-1?--->?1?I=1?--->?2
????idx?=?find（QAM_input_I>1）;
????QAM_input_I（idx）?=?1;
????idx?=?find（QAM_input_I<-1）;
????QAM_input_I（idx）?=?-1;
????idx?=?find（QAM_input_Q>1）;
????QAM_input_Q（idx）?=?1;
????idx?=?find（QAM_input_Q<-1）;
????QAM_input_Q（idx）?=?-1;
????output_frame（1:2:end）?=?QPSK_Demodu_IQ（round（（QAM_input_I+1）/2）?+?1）;
????output_frame（2:2:end）?=?QPSK_Demodu_IQ（round（（QAM_input_Q+1）/2）?+?1）;
case?4
????QAM_16_Demodu_IQ?=?[0?1?3?2];???%f（m）=（m+3）/2?+?1?so?I=-3?--->?1?I=1?--->?3
????idx?=?find（QAM_input_I>3）;
????QAM_input_I（idx）?=?3;
????idx?=?find（QAM_input_I<-3）;
????QAM_input_I（idx）?=?-3;
????idx?=?find（QAM_input_Q>3）;
????QAM_input_Q（idx）?=?3;
????idx?=?find（QAM_input_Q<-3）;
????QAM_input_Q（idx）?=?-3;
????tmp?=?round（（QAM_input_I+3）/2）?+?1;
????output_frame（1:4:end）?=?bitget（QAM_16_Demodu_IQ（tmp）2）;
????output_frame（2:4:end）?=?bitget（QAM_16_Demodu_IQ（tmp）1）;
????tmp?=?round（（QAM_input_Q+3）/2）?+?1;
????output_frame（3:4:end）?=?bitget（QAM_16_Demodu_IQ（tmp）2）;
????output_frame（4:4:end）?=?bitget（QAM_16_Demodu_IQ（tmp）1）;
case?6
????QAM_64_Demodu_IQ?=?[0?1?3?2?6?7?5?4];???%f（m）=（m+7）/2?+?1?so?I=-7?--->?1?I=1?--->?5
????idx?=?find（QAM_input_I>7）;
????QAM_input_I（idx）?=?7;
????idx?=?find（QAM_input_I<-7）;
????QAM_input_I（idx）?=?-7;
????idx?=?find（QAM_input_Q>7）;
????QAM_input_Q（idx）?=?7;
????idx?=?find（QAM_input_Q<-7）;
????QAM_input_Q（idx）?=?-7;
????tmp?=?round（（QAM_input_I+7）/2）?+?1;
????output_frame（1:6:end）?=?bitget（QAM_64_Demodu_IQ（tmp）3）;
????output_frame（2:6:end）?=?bitget（QAM_64_Demodu_IQ（tmp）2）;
????output_frame（3:6:end）?=?bitget（QAM_64_Demodu_IQ（tmp）1）;
????tmp?=?round（（QAM_input_Q+7）/2）?+?1;
????output_frame（4:6:end）?=?bitget（QAM_64_Demodu_IQ（tmp）3）;
????output_frame（5:6:end）?=?bitget（QAM_64_Demodu_IQ（tmp）2）;
????output_frame（6:6:end）?=?bitget（QAM_64_Demodu_IQ（tmp）1）;
end

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

?????文件???????2693??2004-10-03?22:04??V-BLAST程序\demodulation.m

?????文件???????1237??2004-10-03?22:04??V-BLAST程序\modulation.m

?????文件????????134??2007-04-20?21:53??V-BLAST程序\read?me.txt

?????文件???????3714??2007-04-20?21:44??V-BLAST程序\vblast.m

?????文件???????1524??2007-04-20?20:58??V-BLAST程序\vblast1.m

?????文件???????3015??2007-04-20?21:15??V-BLAST程序\vblast3.m

?????文件???????1590??2007-04-20?21:39??V-BLAST程序\vblast4.m

?????目錄??????????0??2007-04-20?21:53??V-BLAST程序

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

????????????????13907????????????????????8