将随机数字信号进行16-QASK调制，使用升余弦滤波器模拟具有噪声的信道，绘制眼图，并采用眼图寻找最佳判决时间-The random 16-QASK digital signal modulation, the use of raised cosine filter simulation of the channel noise and draw the eye diagram, using the eye diagram to find the best judgments of time