The Research On The Synchronization Scheme For OFDM-CDMA, The Key Technique In 4G Wireless Communication

This thesis mainly studies on the key technique for 4G wireless communication: OFDM-CDMA synchronization, with both software method and hardware method.In the beginning of the thesis, we discuss the basic theory of OFDM-CDMA, and then we present a set of SIMULINK simulation system and the recommend hardware parameters. OFDM-CDMA synchronization mainly include time synchronization, frequency synchronization and frame synchronization, in such an order, we arrange the following content. In time synchronization, we mainly discuss the time offset influence and the way to compensate, include the preamble scheme, the pilot scheme and the cyclic prefix. In frequency synchronization, we mainly discuss the frequency offset influence and the way to compensate, include the coarse synchronization and the fine synchronization. The frame synchronization is most likely to be used on the multi-user background, where the thesis present an innovative method: the PN sequence method.Ihe following content discuss the structure of the hardware system, and then present its result and photo.