-LTE系统小区搜索的研究

LTE project is evolution of 3G, as a technique between 3G and 4G, paid attention by the world. Cell Search is the process when a terminal firstly accessing to a cell or a terminal switching over to a cell, getting the synchronization of both time and frequency. As the basis of communication between terminal and base, the performance of Cell Search impacts importance to the overall communication system. Cell Search in LTE is processed step by step: firstly, synchronized to Primary Synchronization Channel(P-SCH), acquiring the identity of cell group, 5ms time synchronization and estimation of frequency; then, synchronized to Secondary Synchronization Channel(S-SCH) , obtaining identity of cell, 10ms time synchronization, and the mode of cyclic prefix. Compared with traditional method, this paper put forward an enhanced method that reduces the complexity and computation. Simulation showed that enhanced method effectively reduced the complexity and computation while assuring the reliability.