CRC_Wrong_Dec_1.rar_CRC MATLAB_crc_crc matlab code

%function CRC_Wrong_Dec=CRC_Wrong_Dec clc clear countt=0; right_c=0;error_c=0; n=input('choose n bits data = '); m=zeros(n+1,n+1); i=1; k=4; % values of interest are 138, 113, 101, 87, 84, and 80 %data=[ 1 1 1 1 0 1 0 1] data=randint(1,n,2) %if (n<7) poly=[1 0 0 1 0 1] %長度多長就錯幾個看不出來; %elseif (n<10) % poly=[1 1 0 0 1 1 0 1 1] % CRC-8-WCDMA x8 + x7 + x4 + x3 + x + 1 %elseif (n<17) % poly=[1 0 0 0 0 0 1 0 1 1 0 0 0 1 0 0 1] %CRC-16-DECT x16 + x10 + x8 + x7 + x3 + 1 %else % poly=[1 0 0 0 0 0 1 0 1 1 0 0 0 1 0 0 1] %end; % Build the CRC with gfdeconv [q,r]=gfdeconv(fliplr([data zeros(1,length(poly)-1)]),fliplr(poly)); r=fliplr(r); % change to descending powers if length(r)<length(poly)-1 %餘數小於除式(長度-1),前面補零 r=[zeros(1,length(poly)-1-length(r)),r]; end crc_data=[data r] % add the remainder % CRC編碼完成 % 解碼 %rec_data=[ 1 0 1 0 1 0 0 1 1 0 1 1 1 ] %rec_data=randint(1,9,2); %產生隨機接收 K=0; e=2^n-1; %十進位 while e>=0 a=dec2bin(e); %轉二位元 a=double(a); %轉ACS變字串 c=length(a); while c<n a=[0 a]; %補0 使其為8位元 c=c+1; end; nn=1; while nn<n+1 if a(nn)==49 %ACS49 轉 1 b(nn)=1; else b(nn)=0; %ACS48 轉 0 end; nn=nn+1; end; e=e-1; [qq,rr]=gfdeconv(fliplr([b r]),fliplr(poly)); %判斷餘數 if (rr==0) K=K+1 rec_data=[b r] end end;