Patent ID: 8331518

Claim:
A wireless communication apparatus for receiving packets transmitted with delay amounts different for the respective transmission branches, comprising: a plurality of reception branches; a synchronous processing unit that detects synchronous timing independently for said respective reception branches; and a signal processing unit that performs decoding processing subsequent to said synchronous timing for said respective reception branches, wherein said synchronous processing unit detects said synchronous timing for said respective reception branches by autocorrelation processing of a repetitive portion of time waveform for a preamble period of a received packet, said synchronous processing unit determines that packet synchronization is attained under the conditions that autocorrelation results of more than X reception branches exceed a threshold value, and the peak value or the maximum value of said autocorrelation values is determined as synchronous timing with respect to a reception branch in which an autocorrelation result does not exceed the threshold (X is an integer of 1 or more but not more than the number of said reception branches).