DMR Baseband Transmission Technology Research And Deyelopment Based On Sb3500

DMR (Digital Mobile Radio) is put forward by the European telecommunicationsstandards institute (ETSI) the latest global open standard Digital Radio. DMR TDMAtime slot structure, rapid, accurate synchronization and timing for a time-divisionsystem is very important. DMR protocol for three layers: physical layer, data link layer(DLL) and control layer, this paper mainly contains two pieces of content: thebaseband simplex and extended board design. Which is the focus of the basebandsimplex to form a super frame, establishing the time slot, slot synchronization, etc.;The design of the extended board mainly TAB. Schematic design and PCB design.This paper first introduces the system model of the DMR protocol, channel model andthe time slot structure, and then gives the baseband simplex experiment scheme basedon development board, as well as the results of the experiment analysis, finallyintroduces the extension plate design of the main circuit.