matlab实现turbo信道编码
时间: 2024-01-15 16:19:25 浏览: 30
以下是使用MATLAB实现Turbo信道编码的示例代码:
```matlab
% 设置参数
K = 100; % 信息位数
R = 1/3; % 编码速率
M = 4; % 映射方式(4代表16QAM)
EbNo = 5; % 信噪比(dB)
% 生成随机信息位
infoBits = randi([0 1], K, 1);
% 编码
encodedBits = turboEncode(infoBits);
% 调制
modulatedSymbols = qammod(encodedBits, M);
% 添加高斯噪声
SNR = 10^(EbNo/10);
noisySymbols = awgn(modulatedSymbols, SNR, 'measured');
% 解调
demodulatedBits = qamdemod(noisySymbols, M);
% 解码
decodedBits = turboDecode(demodulatedBits);
% 计算误码率
numErrors = sum(infoBits ~= decodedBits);
ber = numErrors / K;
% 显示结果
disp(['误码率:', num2str(ber)]);
% Turbo编码函数
function encodedBits = turboEncode(infoBits)
trellis = poly2trellis(4, [13 15], 13);
interleaver = randintrlv((1:length(infoBits))', 1);
encodedBits = convenc(infoBits, trellis, interleaver);
end
% Turbo解码函数
function decodedBits = turboDecode(demodulatedBits)
trellis = poly2trellis(4, [13 15], 13);
interleaver = randintrlv((1:length(demodulatedBits))', 1);
decodedBits = vitdec(demodulatedBits, trellis, 5, 'trunc', 'hard', interleaver);
end
```