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    發布日期: 2021-06-03
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  • 標簽: qam調制??

資源簡介

給出了兩種8qam調制方法和2種解調方法,通過比較得出誤比特率情況

資源截圖

代碼片段和文件信息

function??sout?=?demodu_8qam_cir(?sinabtype?)

%%%%%%%%%%%%%%%%%%%%%%%%?baisc?parameters?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
N?=?length(sin);
sout?=?zeros(1N);
Psum?=?(2*b*b+a*a)/2;
Prms?=?sqrt(Psum);
%%%%%%%%%%%%%%%%%%%%%%%%%%?demodilate?1?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
?if?type==1;
am?=?zeros(1N);
thita?=?zeros(1N);
c?=0.5*(a?+?b*sqrt(2))/Prms;
lable?=?b*sqrt(2)>a;
for?i=1:N;
am(i)?=?abs(sin(i));
thita(i)?=?angle(sin(i));
flag?=?am(i)?>?c;
if?(~xor(flaglable))
????if(thita(i)>0?&&?thita(i)????????sout(i)?=?1;
????elseif(thita(i)>pi/2?&&?thita(i)????????sout(i)?=?2;
????elseif(thita(i)>-pi?&&?thita(i)<-pi/2)
????????sout(i)?=?7;?
??????else
????????sout(i)?=?4;
?????end;????????????
else
???if(thita(i)>-pi/4?&&?thita(i)???????????sout(i)?=?0;
?????elseif(thita(i)>pi/4?&&?thita(i)<3*pi/4)
???????????sout(i)?=?3;
??????elseif(thita(i)>-3*pi/4?&&?thita(i)<-pi/4)
???????????sout(i)?=?5;
?????else
???????????sout(i)?=?6;
????end;???
end;

%%%%%%%%%%%%%%%%%%%%%%%%%%?格雷解碼?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
?if?sout(i)==2;sout(i)=3;
????elseif?sout(i)==3;sout(i)=2;
????elseif?sout(i)==4;sout(i)=7;
????elseif?sout(i)==5;sout(i)=6;
????elseif?sout(i)==6;sout(i)=4;
????elseif?sout(i)==7;sout(i)=5;
??else
?????sout(i)=sout(i);
??end;
end;

%%%%%%%%%%%%%%%%%%%%%%%%%%?demodilate?2?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
elseif?type?==?2;
????xp?=?[ab-b0b0-a-b]/Prms;
????yp?=?[0bba-b-a0-b]/Prms;?
????dis?=zeros(18);
????for?i=1:N;
????????for?j=1:8
????????dis(j)?=?sqrt((real(sin(i))-xp(j)).^2?+?(imag(sin(i))-yp(j)).^2);
????????end;
????????[xxnum]?=?min(dis);
????????sout(i)?=?num-1;
%%%%%%%%%%%%%%%%%%%%%%%%%%?格雷解碼?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
?if?sout(i)==2;sout(i)=3;
????elseif?sout(i)==3;sout(i)=2;
????elseif?sout(i)==4;sout(i)=7;
????elseif?sout(i)==5;sout(i)=6;
????elseif?sout(i)==6;sout(i)=4;
????elseif?sout(i)==7;sout(i)=5;
?else
?????sout(i)=sout(i);
?end;
????end;
????
%%%%%%%%%%%%%%%%%%%%%%%%%%?demodilate?3?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%????
elseif?type?==?3;????????
end;

%%%%%%%%%%%%%%%%%%%?change?the?octal?sequnece?into?binary?sequnece?%%%%%%%%%%%%%%%%%%%?
sout?=?de2bi(sout3‘left-msb‘);
sout?=?reshape(sout‘13*N);???????%change?the?octal?sequnece?into?binary?sequnece
sout?=?sout‘;???
%%%%%%%%%%%%%%%%%%%%%%???End????%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????2421??2013-05-05?21:25??demodu_8qam_cir.m
?????文件????????3207??2013-05-05?21:25??demodu_8qam_mat.m
?????文件?????????993??2013-05-05?21:25??mapping_cir.m
?????文件?????????974??2013-05-05?21:25??mapping_mat.m
?????文件????????1265??2013-05-05?21:25??modu_8qam_cir.m
?????文件????????1250??2013-05-05?21:25??modu_8qam_mat.m
?????文件????????3560??2013-05-05?21:25??work1.m
?????文件????????1651??2013-05-05?21:25??work2.m
?????文件????????1553??2013-05-05?21:25??work3.m
?????文件????????1851??2013-05-05?21:25??work4.m

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