function?[x2x20]=bpskdemod（yfbfcfs）?%BPSK?demodulate
%y?is?input?signal?needed?demodulated
%fb?is?bits?frequency?of?s
%fc?is?carrier?frequency
%fs?is?sampling?frequency
%x2?is?output?of?modulated
%x20?is?x2?for?figure?in?MATLAB
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Tb=1/fb;?%a?code?period
Ts=1/fs;?%sampling?period
Ns=Tb/Ts;?%the?sample?number?of?a?code?period
t0=[0:Ns-1]*Ts;??%the?sampling?time?point?in?a?code?period
x1=cos（2*pi*fc*t0）;?%?1?corresponding
x0=cos（2*pi*fc*t0+pi）;%?0?corresponding
x2=[?];
x20=[?];
bitsnum=length（y）/Ns;
for?i=1:bitsnum?%%%%%%%%%%?相關解調
????b1=（i-1）*Ns;
????b2=（i*Ns-1）;
????yt=y（b1+1:b2+1）;
????d1=sum（yt.*x1）;
????d0=sum（yt.*x0）;
????if?d1>=d0?%%%%%%%%%%判決
????????x2=[x2?1];
????????x20=[x20ones（1Ns）];
????else
????????x2=[x20];
????????x20=[x20zeros（1Ns）];
????end
end

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

?????文件????????844??2010-03-31?11:29??ray\bpskdemod.m

?????文件????????158??2010-03-31?12:03??ray\getrandbits.m

?????文件???????1682??2010-04-06?11:04??ray\bpsk_ray.m

?????文件???????1211??2010-04-06?10:30??ray\bpsk_agwn.m

?????文件???????1774??2010-04-06?11:03??ray\qpsk_ray.m

?????文件???????1382??2010-04-05?21:12??ray\qpsk_ray.asv

?????文件???????1275??2010-04-05?21:15??ray\qpskdemod.m

?????文件???????1255??2010-04-05?21:07??ray\qpskdemod.asv

?????文件???????1673??2010-04-06?10:56??ray\bpsk_ray.asv

?????文件???????1510??2010-04-06?11:06??ray\qpsk_agwn.m

?????文件???????1494??2010-04-06?11:06??ray\qpsk_agwn.asv

?????文件???????1967??2010-04-06?19:05??ray\qam_ray.m

?????文件???????2133??2010-04-06?12:50??ray\qam_ray.asv

?????文件???????1811??2010-04-06?19:01??ray\qamdemod.m

?????文件???????1811??2010-04-06?19:00??ray\qamdemod.asv

?????文件???????1684??2010-04-06?19:12??ray\qam_agwn.m

?????文件????????861??2010-04-06?19:48??ray\main.m

?????文件????????759??2010-04-06?19:37??ray\main.asv

?????文件??????38148??2010-04-06?19:47??ray\snr_ber.jpg

?????目錄??????????0??2010-04-05?19:51??ray

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????????????????63432????????????????????20