Patent ID: 7158541

Claim:
A signal synchronization method for a communication system which conducts packet communication in bursts, the method comprising: receiving a packet signal transmitted in bursts the packet signal being made up of data and a preamble including a signal repeated a known number of times; comparing a correlation value of each of the received repeated signals and at least one additional signal with a threshold value; outputting a signal based on each of the results of the comparing of the correlation values; comparing the outputted signals; and generating a synchronization signal on the basis of the comparison of the outputted signals when an ending of a periodicity of same results of said comparison of the outputted signals are recognized after repetitiveness of said periodicity, the repetitiveness of said periodicity being that the same results of said comparison of the outputted signals occur more than a predetermined number of times which is less than the known number of times, and the ending of said periodicity being that a result of said comparison of the outputted signals differs from the same results.