咬尾卷积码的matlab实现

以下是咬尾卷积码的MATLAB实现示例代码：

% 咬尾卷积码编码器
% 输入信息比特流为msg，生成多项式为g1、g2
% 输出码元流为coded
function coded = tailBitingConvEncoder(msg, g1, g2)
    % 计算码长和约束长度
    k = length(g1) - 1;
    n = 2 * k;
    % 初始化状态和码元流
    state = zeros(1, k);
    coded = zeros(1, length(msg) / k * n);
    % 编码
    for i = 1:length(msg)/k
        % 获取信息比特流的一段
        msgSeg = msg((i-1)*k+1:i*k);
        % 计算码元流的一段
        [out1, state] = convEnc(msgSeg, g1, state);
        [out2, state] = convEnc(msgSeg, g2, state);
        coded((i-1)*n+1:i*n) = [out1, out2];
    end
end

% 卷积编码器
% 输入信息比特流为msg，生成多项式为g，初始状态为state
% 输出码元流为coded，更新后的状态为newState
function [coded, newState] = convEnc(msg, g, state)
    % 计算约束长度和状态长度
    k = length(g) - 1;
    m = length(state);
    % 初始化码元流和新状态
    coded = zeros(1, k);
    newState = zeros(1, m);
    % 计算码元流
    for i = 1:k
        coded(i) = mod(sum(msg .* g(end-i+1:end)), 2);
    end
    % 更新状态
    newState(2:end) = state(1:end-1);
    newState(1) = mod(sum(msg .* g(2:end)), 2);
    newState(1) = mod(sum([newState, coded] .* g), 2);
end