Walsh扩频的matlab代码示例

这是一个简单的 Walsh 扩频的 MATLAB 代码示例：

% 定义输入比特流
input_bits = [1 0 1 1 0 1 0 0];

% 定义 Walsh 码
walsh_code = [1 1 1 -1 -1 1 -1 -1];

% 扩频器
spread_signal = kron(input_bits, walsh_code);

% 绘制扩频信号
figure;
stem(spread_signal);
title('Walsh Spread Signal');
xlabel('Time');
ylabel('Amplitude');

% 反扩频器
recovered_signal = spread_signal .* walsh_code;

% 绘制恢复信号
figure;
stem(recovered_signal);
title('Recovered Signal');
xlabel('Time');
ylabel('Amplitude');

% 恢复比特流
recovered_bits = zeros(1, length(input_bits));
for i = 1:length(input_bits)
recovered_bits(i) = sum(recovered_signal((i-1)*length(walsh_code)+1:i*length(walsh_code))) / length(walsh_code);
end

% 绘制恢复比特流
figure;
stem(recovered_bits);
title('Recovered Bits');
xlabel('Time');
ylabel('Amplitude');