%产生2ASK、4ASK调制信号
%Len：码元长度，默认值为1000
%IsPlot：是否绘图，'1'表示绘图，否则不绘图
%IsOutput：是否将ASK调制数据输出到文本文件中，'1'表示输出，否则不输出(% produces 2ASK, 4ASK modulation signals
%Len: symbol length, defaults to 1000
%IsPlot: do you want to draw,'1'represents drawing, otherwise do not plot
%IsOutput: do you want to output ASK modulated data to a text file and'1'to indicate output, otherwise it doesn't output?)