m序列的matlab代码
时间: 2023-10-06 13:08:27 浏览: 137
以下是一个简单的m序列生成函数的Matlab代码:
```matlab
function m_seq = m_sequence(reg, n)
% M_SEQUENCE Generate an m-sequence given the generator polynomial in reg
% and the length of the sequence n.
% The generator polynomial is given as a binary vector representing the
% coefficients of the polynomial in descending order, e.g. [1 0 1] for
% x^2 + 1.
% The output sequence is a binary vector of length n.
% Determine the order of the polynomial
m = length(reg) - 1;
% Setup the shift register and output sequence
shift_reg = ones(1, m);
m_seq = zeros(1, n);
% Generate the sequence
for i = 1:n
m_seq(i) = shift_reg(m);
feedback = mod(sum(shift_reg .* reg), 2);
shift_reg = [feedback shift_reg(1:m-1)];
end
end
```
使用示例:
```matlab
% Generate an m-sequence with a generator polynomial of x^10 + x^9 + 1
reg = [1 0 0 0 0 0 0 1 1 0 1];
n = 1023; % The sequence length must be 2^m - 1
m_seq = m_sequence(reg, n);
% Plot the sequence
plot(m_seq);
title('M-Sequence');
xlabel('Sample');
ylabel('Amplitude');
```
这将生成一个长度为1023的m序列,并绘制其波形。