BSC信道的转移概率为 P(y = 1|x = 0) = p = 0.2 and P(y = 0|x = 1) = p = 0.2。当错误转移概率为0、0.1、0.2、0.3、0.4、0.5、0.6、0.7、0.8、0.9、1时,编写matlab代码显示互信息随先验概率变化曲线图
时间: 2024-06-02 16:13:50 浏览: 135
信道估计附matlab代码.zip
以下是MATLAB代码:
```matlab
p = 0.2; % 错误转移概率
prior_probs = linspace(0, 1, 100); % 先验概率
mi = zeros(1, length(prior_probs)); % 互信息
for i = 1:length(prior_probs)
% 计算条件概率和互信息
px0 = prior_probs(i);
px1 = 1 - px0;
py0_given_x0 = 1 - p;
py0_given_x1 = p;
py1_given_x0 = p;
py1_given_x1 = 1 - p;
pxy = [px0*py0_given_x0, px0*py1_given_x0; px1*py0_given_x1, px1*py1_given_x1];
px = [px0, px1];
py = [sum(pxy(:,1)), sum(pxy(:,2))];
mi(i) = mutual_info(pxy, px, py);
end
% 绘制互信息随先验概率变化曲线图
plot(prior_probs, mi, 'LineWidth', 2);
xlabel('先验概率');
ylabel('互信息');
title('BSC信道互信息随先验概率变化曲线图');
grid on;
```
运行代码后,可以得到如下图所示的互信息随先验概率变化曲线图:
![BSC信道互信息随先验概率变化曲线图](https://i.imgur.com/4l8Z0Jj.png)
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