clear;?
SNRindB1=0:2:8;?????????????????????????????????????%?設置SNR范圍?
SNRindB2=0:0.1:8;?
for?ii=1:length（SNRindB1）?
?
counter=0;??????????????????????????????????????????%?計數器置0?
numofsymbolerror=0;?
numofbiterror=0;?
while?（numofbiterror<100）?
?
N=1000;?
E=1;????????????????????????????????????????????????%?碼元能量?
snr=10^（SNRindB1（ii）/10）;???????????????????????????%?信噪比?
sgma=sqrt（E/snr）/2;?????????????????????????????????%?噪聲功率?
s00=[1?0];?s01=[0?-1];?s11=[-1?0];?s10=[0?1];???????%?雙比特碼元映射?
?
%?信源產生?
for?i=1:N?
????temp=rand;??????????????????????????????????????%?生成取值在0和1之間的服從均勻分布的隨機變量?
????if?（temp<0.25）?????????????????????????????????%?信源輸出00，10，11，01的概率均為1/4?
????????dsource1（i）=0;?dsource2（i）=0;?
????????tt（iii）=complex（s00（1）s00（2））;?
????elseif?（temp<0.5）???????????????????????????????
????????dsource1（i）=0;?dsource2（i）=1;?
????????tt（iii）=complex（s01（1）s01（2））;?
????elseif?（temp<0.75）??????????????????????????????
????????dsource1（i）=1;?dsource2（i）=0;?
????????tt（iii）=complex（s10（1）s10（2））;?
????else?????????????????????????????????????????????
????????dsource1（i）=1;?dsource2（i）=1;?
????????tt（iii）=complex（s11（1）s11（2））;?
????end;?
end;?
?
%?差錯檢測及誤碼率計算?
?
for?i=1:N?
????????mm=raylrnd（0.7）;??
????n=sgma*randn（12）;??????????????????????????????%?生成兩個服從N（0sgma）的隨機變量?
????if?（（dsource1（i）==0）?&?（dsource2（i）==0））??
????????r=mm*s00+n;????????????????????????????????????%?加入噪聲?
????elseif?（（dsource1（i）==0）?&?（dsource2（i）==1））??
????????r=mm*s01+n;?
????elseif?（（dsource1（i）==1）?&?（dsource2（i）==0））??
????????r=mm*s10+n;?
????else??
????????r=mm*s11+n;?
????end;?
?????
????%?判決?
????rr（iii）=complex（r（1）r（2））;?
????c00=dot（rs00）;?c01=dot（rs01）;?c10=dot（rs10）;?c11=dot（rs11）;?
????c_max=max（[c00c01c10c11]）;?
????if?（c00==c_max）?decis1=0;?decis2=0;?
????elseif?（c01==c_max）?decis1=0;?decis2=1;?
????elseif?（c10==c_max）?decis1=1;?decis2=0;?
????else?decis1=1;?decis2=1;?
????end;?
????%?計算誤碼率及誤符號率?
?????
????symbolerror=0;?
????if?（decis1~=dsource1（i））?numofbiterror=numofbiterror+1;?symbolerror=1;??
????end;?
????if?（decis2~=dsource2（i））?numofbiterror=numofbiterror+1;?symbolerror=1;??
????end;?
????if?（symbolerror==1）?numofsymbolerror=numofsymbolerror+1;??
????end;?
end;?
counter=counter+1;?
end;?
ps=numofsymbolerror/（N*counter）;?????????????????????
pb=numofbiterror/（2*N*counter）;??????????????????????
?
????smld_bit_err_prb（ii）=pb;?
????smld_symbol_err_prb（ii）=ps;?
????disp（[pspb]）;?
end;?
?
%?理論值?
for?i=1:length（SNRindB2）?
????SNR=10^（SNRindB2（i）/10）;????????????????????????%?信噪比?
????theo_err_prb（i）=0.5*erfc（sqrt（SNR））;????????????%?AWGN信道下的誤碼率理論值?
????theo_err_ray（i）=0.5*（1-1/sqrt（1+1/SNR））;????????%?Rayleigh衰落信道下的誤碼率理論值?
end;?
?
%?畫圖?
figure（1）???????????????????????????????????????????%?BER圖?
semilogy（SNRindB1smld_bit_err_prb‘bs‘）;?
%?legend（‘AWGN?Simulation‘）;?
hold?on;?
semilogy（SNRindB1smld_symbol_err_prb‘ro‘）;?

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

?????文件???????3473??2010-09-09?09:37??QPSK\AWGN信道，BER?.m

?????文件???????3046??2010-09-06?19:36??QPSK\QPSK調制完整仿真\QPSK_Modulation.m

?????文件???????3048??2010-09-06?20:28??QPSK\QPSK調制完整仿真\QPSK_Modulation.asv

?????文件???????1991??2010-09-07?15:01??QPSK\wang無干擾算法的QPSK仿真\qpsksim.m

?????文件???????1625??2010-09-06?19:26??QPSK\QPSK定時恢復程序\QPSK4_Weitongbu.rar

?????文件???????4031??2008-06-23?16:46??QPSK\QPSK定時恢復程序\QPSK4_Weitongbu.m

?????文件??????56674??2010-09-06?19:34??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\ASK-OOK-FSK-BPSK.rar

?????文件???????5282??2008-06-15?22:13??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN.zip

?????文件????????545??2008-03-28?18:32??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\trabajos_MATLAB.txt

?????文件????????999??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\askd.m

?????文件???????1048??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\bpskd.m

?????文件???????2662??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\epsk.m

?????文件???????1218??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\fskd.m

?????文件???????1045??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\ookd.m

?????文件???????1751??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\qpskd.m

?????文件?????267264??2010-09-09?16:52??QPSK\QPSK系統仿真\QPSK系統仿真.doc

?????文件????????895??2010-09-07?21:42??QPSK\QPSK信號源的M文件\QPSK_source.m

?????文件?????203104??2010-09-07?17:01??QPSK\QPSK+Rayleigh（AWGN）仿真MATLAB程序\81404616QPSK+Rayleigh（AWGN）Simulation.zip

?????文件???????3402??2006-12-06?21:43??QPSK\QPSK+Rayleigh（AWGN）仿真MATLAB程序\BER.m

?????文件???????5398??2010-09-09?10:12??QPSK\QPSK+Rayleigh（AWGN）仿真MATLAB程序\QPSK.m

?????文件?????308736??2010-09-08?08:58??QPSK\QPSK+Rayleigh（AWGN）仿真MATLAB程序\分析報告.doc

?????文件???????5398??2010-09-09?10:09??QPSK\QPSK+Rayleigh（AWGN）仿真MATLAB程序\QPSK.asv

?????目錄??????????0??2010-12-08?13:29??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN

?????目錄??????????0??2010-12-08?13:29??QPSK\QPSK調制完整仿真

?????目錄??????????0??2010-12-08?13:29??QPSK\wang無干擾算法的QPSK仿真

?????目錄??????????0??2010-12-08?13:29??QPSK\QPSK定時恢復程序

?????目錄??????????0??2010-12-08?13:29??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制

?????目錄??????????0??2010-12-08?13:29??QPSK\QPSK系統仿真

?????目錄??????????0??2010-12-08?13:29??QPSK\QPSK信號源的M文件

?????目錄??????????0??2010-12-08?13:29??QPSK\QPSK+Rayleigh（AWGN）仿真MATLAB程序

............此處省略5個文件信息