Reception synchronization apparatus and demodulating...

Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions

Reexamination Certificate

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C370S206000, C370S207000, C370S517000, C370S504000

Reexamination Certificate

active

06999406

ABSTRACT:
A reception synchronization apparatus capable of achieving precise synchronization of an OFDM signal including a frame guard added to the OFDM signal includes a multiplier for calculating the correlation between a received OFDM signal and an OFDM signal delayed by a delay circuit; a moving integration circuit for adding a signal from the multiplier over a guard period; n frame guard removing circuits, which respectively receive a signal from the moving integration circuit, remove the frame guard period from the received signal, and output a resultant signal; n interval integrators for cumulatively adding signals outputted from the frame guard removing circuits; and a detection circuit for detecting a maximum peak from the results from the n interval integrators and generating a detection signal indicating a synchronization timing position corresponding to the detected maximum peak position.

REFERENCES:
patent: 5602835 (1997-02-01), Seki et al.
patent: 6192056 (2001-02-01), Tsuruoka
patent: 6373861 (2002-04-01), Lee
patent: 6549589 (2003-04-01), Tsuruoka
patent: 6647025 (2003-11-01), Sudo
patent: 6658063 (2003-12-01), Mizoguchi et al.
patent: 6714511 (2004-03-01), Sudo et al.
patent: 2002/0086690 (2002-07-01), Takahashi et al.

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