1.完整项目描述和程序获取
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2.部分仿真图预览
3.算法概述
①BCH码是一种纠错码、线性分组码、循环码。
②需要传输信息位数：k
③纠错能力：t
④总码长（信息位+监督位）：n
⑤n的长度满足n=2^m – 1时生成的为本原BCH码；n的长度为2^m – 1的因子时为非本原BCH码
⑥此外还有加长BCH码和缩短BCH码。
⑦具体的BCH码通常用BCH（n,k）码来表示。
4.部分源码
%begin decoding
for j=1:nwords
rec_data=rec_data2((j-1)*n+1:(j-1)*n+n);
syndrome=gf(zeros(1, 2*t), m);
for i=1:n,
syndrome=syndrome.*alpha_tb+rec_data(n-i+1);
end;
%imba
lambda = gf([1, zeros(1, t)], m);
lambda0= lambda;
b=gf([0, 1, zeros(1, t)], m);
b2 = gf([0, 0, 1, zeros(1, t)], m);
k1=0;
gamma = one;
delta = zero;
syndrome_array = gf(zeros(1, t+1), m);
if(simplified == 1)
for r=1:t,
r1 = 2*t-2*r+2;
r2 = min(r1+t, 2*t);
num = r2-r1+1;
syndrome_array(1: num) = syndrome(r1:r2);
delta = syndrome_array*lambda';
lambda0 = lambda;
lambda = gamma*lambda-delta*b2(2:t+2);
if((delta~= zero) && (k1>=0))
b2(3)=zero;
b2(4:3+t) = lambda0(1:t);
gamma = delta;
k1 = -k1;
else
b2(3:3+t) = b2(1:t+1);
gamma = gamma;
k1=k1+2;
end
joke=1;
end
else
for r=1:2*t,
r1 = 2*t-r+1;
r2 = min(r1+t, 2*t);
num = r2-r1+1;
syndrome_array(1:num) = syndrome(r1:r2);
delta = syndrome_array*lambda';
lambda0 = lambda;
lambda = gamma*lambda-delta*b(1:t+1);
if((delta ~= zero) && (k1>=0))
b(2:2+t)=lambda0;
gamma = delta;
k1=-k1-1;
else
b(2:2+t) = b(1:t+1);
gamma = gamma;
k1=k1+1;
end
joke=1;
end
end
%inverstable
inverse_tb = gf(zeros(1, t+1), m);
for i=1:t+1,
inverse_tb(i) = alpha^(-i+1);
end;
%chien's search
lambda_v = zero;
accu_tb=gf(ones(1, t+1), m);
for i=1:n,
lambda_v=lambda*accu_tb';
accu_tb = accu_tb.*inverse_tb;
if(lambda_v==zero)
error(1,n-i+1)=1;
else
error(1,n-i+1)=0;
end
end
found = find(error(1,:)~=0);
for i=1:length(found)
location=found(i);
if location <= k;
rec_data(n-location+1)=rec_data(n-location+1)+one;
end
end
decoded_data((j-1)*k+1:(j-1)*k+k)=rec_data(n-k+1:n);
end
%decoded_data;
error=0.;
for i=1:length(message)
if message(i)~=decoded_data(i)
error=error+1;
end
end
ber = error/length(message);
14_047_m
