Examples of communication Mobile phone=Telephone+SMS+ 圈 Radio+TV+Internet+... SMS(QQ,WeChat)=Short Message Sys =Telegraphy Telegraphy:oldest communication sys The idea of using 0 and 1(binary digits,bits)to code information symbols and then transmit the sequence of bits is the standard way of modern communication systems. UESTC-Introduction Prof李晓峰 7