資源簡介
通信系統(tǒng)仿真,信源編碼,信道編碼
信源:模擬信源(模擬話音) 自己構(gòu)造一時間函數(shù)
數(shù)字化方式:增量調(diào)制
基帶碼:PST碼
信道碼:漢明碼
調(diào)制方式:FSK
信道類型:AWGN
解調(diào)方式與輸入端對應(yīng)

代碼片段和文件信息
function?[y1?fs?fb?fc1?fc2]?=?fsk(xfs?fb?fc1?fc2flag);
?
%?----------------------------------------------------%
%?x:?bit?stream;????????%
%?(fs:sampling?fre;?fb:bit?rate;?fc:carrier?fre)??????%
%?y:?已調(diào)信號?????????????????????????????????????????%
%-----------------------------------------------------%
if?nargin<5;?
????fc2=2.5;
end;
if?nargin<4;?
????fc1=2;?
end;
if?nargin<3;
????fb=1;???
end;
if?nargin<2;
????fs=32;
end;
if?nargin<1;?
????x=[0?0?1?1?1?0?0?1?0?1?1?0?0?0?1?0];?
end;
T=length(x)/fb;
m=fs/fb;
dt=1/fs;?t=0:dt:T-dt;
xx=2*reshape(repmat(x‘1m)‘1length(x)*m)-1;%RecPulse(x?m?2);????????????%?基帶信號
y1=?(xx>=0).*sin(2*pi*fc1*t)+(xx<0).*sin(2*pi*fc2*t);???????????????????????%?FS
?
%?------------------------圖像-----------------------------------?%
if?flag==1;
????figure(3)
????subplot(211);?plot(t?y1?t?xx*.5?[0?T]?[0?0]?‘b:‘);
????title(‘Signal‘);
????
????n=length(y1);?y=fft(y1)/n;?y=abs(y(1:fix(n/2)))*2;
????I=find(y<1e-04);?y(I)=1e-04;?%x=20*log10(x);????
????f1=m/n;?f=0:f1:(length(y)-1)*f1;
????subplot(212);?plot(f?y?‘r‘);?grid?on;
????title(‘Spectrum‘);?xlabel(‘f/fb‘);?zoom?xon;
????set(gcf‘num‘‘off‘‘name‘...
????????[‘FSK‘?blanks(10)]);
end;
????
?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件??????448205??2013-05-09?09:05??大四上通信系統(tǒng)仿真\通信系統(tǒng)仿真sq.docx
?????目錄???????????0??2013-01-20?09:13??大四上通信系統(tǒng)仿真\
?????文件????????1257??2013-01-09?15:37??大四上通信系統(tǒng)仿真\fsk.m
?????文件????????1783??2013-01-09?15:37??大四上通信系統(tǒng)仿真\fskdet.m
?????文件????????2740??2013-01-10?17:16??大四上通信系統(tǒng)仿真\Utiaoz.m
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