| TD-SCDMA is one of the international CDMA standards for3G mobile communications onbehalf of China. The paper introduces the process of Wireless communication including thestart of Wireless communication,1G,2G,3G and4G.3G mobile communications includesWCDMA,CDMA2000,TD-SCDMA and WiMAX. The paper stress on TD-SCDMA. Theadvantage of TD-SCDMA is TDD,CDMA, flexible air interface, smart antenna and so on.According to2GHz TD-SCDMA digital cellular mobile telecommunication network：HSDPAphysical layer technical specification, the paper introduces the physical layer of TD-SCDMA.Physical channels and mapping of transport channels onto physical channels, multiplexingand channel coding, spreading and modulation, physical layer procedure are described.The control channel of TD-SCDMA is discussed, especially for Uplink PilotChannel(UPPCH),Paging Indicator Channel(PICH),Shared Control Channel forHS-DSCH(HS-SCCH).For UPPCH, synchronizing channel, burst structure, synchronizing process and synchronizingsequence was described. Then the paper introduces uplink synchronization algorithm. Animproved fast uplink synchronization algorithm is put into use. The result of The simulationand implementation is satisfied.For PICH, Paging instructions to PICH channel mapping and PICH frame structure based onmultiple frame is discussed.The the paper realizes the function of PICH channel.For HS-SCCH,Single carrier HS-SCCH channel coding and multiplexing is introduced.thesteps are channel multiplexing, additional CRC, channel coding, speed matching, HS-SCCHinterleaving, physical channel mapping of HS-SCCH. The paper realizes the function of eachmodule. |
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