Patent ID: 8385371
Filing Date: 2013-02-26
Classification: H04H,H04L

Abstract:
1. A frame synchronizer for achieving frame synchronization of an input signal transmitted with any one of a plurality of predetermined types of frame lengths, the frame synchronizer comprising: correlation detection means to calculate a correlation value indicating the correlation between a known sequence, which is a symbol string having a known value inserted in the input signal, and a reception sequence which is a symbol string obtained by detecting the input signal, wherein the correlation detection means calculates a first correlation value for the absence of a pilot signal inserted in the input signal and a second correlation value for the presence of a pilot signal inserted in the input signal; and frame synchronization means which are provided in a number equal to the number of said predetermined types of the frame lengths in a one-to-one correspondence fashion, wherein the correlation detection means supplies the first correlation value to some of the number of frame synchronization means and the second correlation value to other of the second frame synchronization means, wherein the frame synchronization means compare an associated frame length and a peak-to-peak spacing of the correlation value and output a synchronizing signal synchronous with a frame having the associated frame length if the associated frame length matches the peak-to-peak spacing of the correlation value.