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    發布日期: 2021-06-01
  • 語言: Matlab
  • 標簽: 常規解碼??

資源簡介

用于水聲通信的pattern通信體制的matlab源代碼 4bits量化 常規解碼 例程

資源截圖

代碼片段和文件信息

close?all;
clear?all;
clc;
%**************pattern編碼***********
f0=6e3;
fs=4.8e4;??????????????????????????%采樣率40KHz
k=3000/0.04;
t=0:1/fs:(0.04-1/fs);??????????????%同步碼寬度?40ms
x1=cos(2*pi*f0*t+pi*k*t.^2);???????%同步碼?x1帶寬6--9KHz
x2=zeros(12400);??????????????????%時隙?50ms??
t1=0:1/fs:(0.008-1/fs);
k1=3000/0.008;
x3=cos(2*pi*f0*t1+pi*k1*t1.^2);????%pattern碼寬度?8ms
x=zeros(136);?????????????????????%4bit量化的每一量化間隔
N=6000;??????????????????????????????%隨機產生信息碼
n_sig=randint(1N);
n=zeros(1N/4);
for?j=1:length(n)
????n(j)=n_sig(4*j-3)*8+n_sig(4*j-2)*4+n_sig(4*j-1)*2+n_sig(4*j);
end
f=length(n);???????????????????????????
w=[x1x2];
y=zeros(1576+length(x3));
??for?i=1:f
????qian=zeros(1n(i)*36);
????hou=zeros(1(16-n(i))*36);
????y=[qianx3hou];
????w=[wy];
??end
??%w=resample(w4805048000);
??%zaosheng=3*randn(1length(w));?%加噪聲
??w=awgn(w-7);???????????????%加高斯白噪聲-15DB時出現誤碼
??%w=w+zaosheng;
%???figure
%???plot(w);
??tt=xcorr(wx1);?????????????????%同步碼做相關
%???figure?
%???plot(tt);
??pp=xcorr(wx3);?????????????????%pattern碼做相關
%???figure
%???plot(pp);
??%*****************常規解碼*******************
??tmax=tt(1);?????????????????????%找同步峰的位置
??tfeng=0;
??y_sig1=zeros(1N);
?for?j=2:length(tt)
?????if?tt(j)>tmax
?????????tmax=tt(j);
?????????tfeng=j;
?????end
?end
T=tfeng;??????????????????????????%同步峰的位置
Tshixi=length(x2);?
Tsyn=length(x1);
m=T+Tsyn+Tshixi-length(y);?????
pfeng=zeros(1f);
Y=zeros(1f);
?for?i=1:f
?????m=m+length(y);
?????pmax=pp(m);
?????pfeng(j)=m;
?????for?k=m-17:m+557
???????????if?pp(k)>pmax
???????????pmax=pp(k);
???????????pfeng(i)=k;???????????%相關峰的位置
????????end
??????Y(i)=round((pfeng(i)-T-(i-1)*length(y)-Tsyn-Tshixi)/36);
?switch?Y(i)
????case?0
????????y_sig1(4*i-3)=0;y_sig1(4*i-2)=0;y_sig1(4*i-1)=0;y_sig1(4*i)=0;
????case?1
????????y_sig1(4*i-3)=0;y_sig1(4*i-2)=0;y_sig1(4*i-1)=0;y_sig1(4*i)=1;
????case?2
????????y_sig1(4*i-3)=0;y_sig1(4*i-2)=0;y_sig1(4*i-1)=1;y_sig1(4*i)=0;
????case?3
????????y_sig1(4*i-3)=0;y_sig1(4*i-2)=0;y_sig1(4*i-1)=1;y_sig1(4*i)=1;
????case?4
????????y_sig1(4*i-3)=0;y_sig1(4*i-2)=1;y_sig1(4*i-1)=0;y_sig1(4*i)=0;
????case?5
????????y_sig1(4*i-3)=0;y_sig1(4*i-2)=1;y_sig1(4*i-1)=0;y_sig1(4*i)=1;
????case?6
????????y_sig1(4*i-3)=0;y_sig1(4*i-2)=1;y_sig1(4*i-1)=1;y_sig1(4*i)=0;
????case?7
????????y_sig1(4*i-3)=0;y_sig1(4*i-2)=1;y_sig1(4*i-1)=1;y_sig1(4*i)=1;
????case?8
????????y_sig1(4*i-3)=1;y_sig1(4*i-2)=0;y_sig1(4*i-1)=0;y_sig1(4*i)=0;
????case?9
????????y_sig1(4*i-3)=1;y_sig1(4*i-2)=0;y_sig1(4*i-1)=0;y_sig1(4*i)=1;
????case?10
????????y_sig1(4*i-3)=1;y_sig1(4*i-2)=0;y_sig1(4*i-1)=1;y_sig1(4*i)=0;
????case?11
????????y_sig1(4*i-3)=1;y_sig1(4*i-2)=0;y_sig1(4*i-1)=1;y_sig1(4*i)=1;
????case?12
????????y_sig1(4*i-3)=1;y_sig1(4*i-2)=1;y_sig1(4*i-1)=0;y_sig1(4*i)=0;
????case?13
????????y_sig1(4*i-3)=1;y_sig1(4*i-2)=1;y_sig1(4*i-1)=0;y_sig1(4*i)=1;
????case?14
????????y_sig1(4*i-3)=1;y_sig1(4*i-2)=1;y_sig1(4*i-

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

?????文件???????3348??2010-01-05?16:09??chc_changgui.m

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

?????????????????3348????????????????????1


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