ldpc中rbp译码算法 matlab
时间: 2023-09-15 11:18:03 浏览: 77
以下是使用Matlab实现LDPC码的RBP译码算法的示例代码:
```matlab
function decoded_bits = ldpc_rbp_decode(received_bits, H, max_iterations)
% 初始化变量
[n, k] = size(H);
Lc = 2*received_bits - 1;
Lq = zeros(n, k);
Lr = zeros(n, k);
decoded_bits = zeros(1, k);
% RBP译码迭代
for iter = 1:max_iterations
% 更新Lr
for i = 1:n
indices = find(H(i,:));
for j = indices
Lr(i,j) = prod(tanh(0.5*Lq(i,indices(indices~=j))));
end
end
% 更新Lq
for i = 1:n
indices = find(H(i,:));
for j = indices
Lq(i,j) = Lc(i) + sum(Lr(indices(indices~=j),j));
end
end
% 判断是否收敛
temp = mod(Lq, 2);
decoded_bits = temp(1, :);
if sum(mod(H*decoded_bits', 2)) == 0
break;
end
end
end
```
其中,输入参数为:
- received_bits:接收到的码字;
- H:LDPC码的校验矩阵;
- max_iterations:最大迭代次数。
输出为解码后的比特序列。
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