本代码编写的是一个电话薄，用以记录和显示联系的姓名及电话。当输入的值为空或错误时，会有相应的提示。-The coding is a phone book, to record and display the name and telephone number of the contact. When the input value is empty or error, there will be tips.

计算输入字符串的CRC编码。CRC编码即循环冗余码，它是利用除法及余数的原理来作错误侦测的。-Calculate the CRC coding of the input string. The CRC encoder that cyclic redundancy code, which is the principle of the division and the remainder for error detection.

空时分组编码两发一收的发射方案，误码率随信噪比的变化-Space time block coding two send a received transmission scheme, the error rate with the change of signal to noise ratio