Fast Timing Synchronization in IEEE802.11p System

In the vehicle communication system, transferred information is needed to be detected as possible as fast in order to avoid car accident and inform the road traffic fast. Fast communication defines that timing synchronization is detected fast. In this paper, we present combination method which can determine synchronization timing of frame is executed by auto-correlation and cross correlation simultaneously using only short preamble area of the packet. Although, the repeated short preambles cause the degradation of performance since the correlation metric goes into flat shape as taking correlation process. But, we can cover the degradation as controlling the changing phase of the preamble, applying auto-correlation and cross correlation mechanism together when packet is received. The new approach is more efficient in memory side not to store the long preamble buffer.