VERFAHREN UND VORRICHTUNG ZUR ERHALTUNG DER SYNCHRONISATION FÜR TDD DRAHTLOSE KOMMUNIKATION

摘要

A Method to maintain Synchronization Tracking in TDD Wireless Communication comprises the steps: divide a midamble into two parts, then detect the first part and the second part of the midamble; perform an auto-correlation property operation between the two parts and a part corresponding to a local midamble and obtain two peaks; compare the amplitude of the two peaks; advance or retard a local timer based on the result of the comparison. The interlaced sampling method will harm the SNR of channel estimation only very slightly. By using this method, the sample frequency can be decreased to only one time of the chip rate of a TD-SCDMA system while still maintaining the ability to track the downlink synchronization.