1、mat l a b 模 擬 FEC 和交織兩種方式用matlab模擬FEC和交織兩種方式FEC （前向糾錯(cuò)方式）： 交織s1=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30 ,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56; x1=(reshape(s1,8,7); x1(2,2)=0;x1(2,3)=0; x1(2,4)=0;x1(2,5)=0; s2=reshape(x1

2、,1,56); x2=reshape(s2,7,8); x2(2,2)=10;x2(2,3)=11; s3=reshape(x2,1,56); a=s1,s2,s3; plot(s1,s2);x1 =1234567890000141516171819202122232425262728293031323334353637383940414243444546474849 50 51 52 53 54 55 56L=1000;M=4；%每個(gè)符號(hào)的比特?cái)?shù)N=2AM-1;%編碼后碼字長(zhǎng)度K=N-4;%信息長(zhǎng)度MSG=randint(L,1);%隨機(jī)產(chǎn)生L比特信號(hào)TP=gftuple(-1:N-1,M)

3、;% 產(chǎn)生加羅華域元素PG=rspoly(N,K);% 產(chǎn)生生成式CODE,ADDED=rsenco(MSG,TP,K);% 編碼NOI=rand(length(CODE)/M,1) msg=randint(k*500,1,2,st1); code = encode(msg,n,k,hamming/binary); errors = zeros(size(code); errors(n-2:n+3) = 1 1 1 1 1 1; inter = randintrlv(code,st2); inter_err = bitxor(inter,errors); deinter = randdeint

4、rlv(inter_err,st2); decoded = decode(deinter,n,k,hamming/binary); disp(Number of errors and error rate, with interleaving:);Number of errors and error rate, with interleaving: code_err = bitxor(code,errors); decoded = decode(code_err,n,k,hamming/binary); disp(Number of errors and error rate, without

5、 interleaving:);Number of errors and error rate, without interleaving: number_without,rate_without = biterr(msg,decoded);L=1000;M=4；%每個(gè)符號(hào)的比特?cái)?shù)N=2AM-1;%編碼后碼字長(zhǎng)度K=N-4;%信息長(zhǎng)度MSG=randint(L,1);%隨機(jī)產(chǎn)生L比特信號(hào)TP=gftuple(-1:N-1,M);% 產(chǎn)生加羅華域元素PG=rsgenpoly(N,K);% 產(chǎn)生生成式 CODE,ADDED=rsenco(MSG,TP,K);% 編碼R=0:0.01:1;% 錯(cuò)誤率for j=1:length(R) %循環(huán)修改錯(cuò)誤率NOI=rand(length(CODE)/M,1)R(j);% 加入 R%的噪聲NOI=(NOI*ones(1,M);% 產(chǎn)生突發(fā)錯(cuò)誤NOI=NOI(:);CODE_NOI=rem(CODE+NOI,2);% 噪聲加入信號(hào)DEC,ERR,CCODE,ERR_C=rsdeco(CODE_NOI,TP,K);% 譯碼MSG=MSG;zeros(ADDED,1);% 調(diào)整長(zhǎng)度error=0;%錯(cuò)誤碼計(jì)數(shù)初值