Research And Function Realization Of Analog Wireless Terminal’s Signaling System

With the rapid development of China’s economy, various industries have beenwidely used in walkie-talkie, walkie-talkie market has gradually formed an importantprofessional communications market. The analog signaling is limited by code capacityand time which generally adopted by conventional analog wireless intercom systemonly provide a relatively simple function for user terminal.This paper introduces the present situation and development situation ofwalkie-talkie market, reserches principle of walkie-talkie and designs a kind ofcoding and decoding is simple and reliable, large code capacity of digital signaling.The signaling lets the conventional analog wireless communication system has strongsystem function and flexible control. Yet the conventional analog wirelesscommunication system not only can communicate the certain events and controllingof user,but also can increase the system’s digital data processing performance throughthe signal transmission protocol.The system uses the full digital signal frame structure, coding and decoding canuse a controller software method to complete, can also use the programmable logicdevice hardware implementation. The wireless terminal between the air interfacesignaling with MSK modulation, the transmission rate for1200/2400bps, envelopecomparison of constant or envelope fluctuation is small, thereby reducing the spreadspectrum. And interleaving technique is implemented for forward error correction toensure data transmission, signaling frame structure with all-digital, wireless terminalair interface signaling between the way in MSK modulation, the transmission rate1200/2400bps.It provides the composition of this proprietary signaling system tocomplete identification, call timing and recording, record queries and statistics, and toachieve a call, group call, broadcast, distance to death, state query, SMS, datatransmission and so on. So it is reputable in walkie-talkie industry.