Method and apparatus for coarse and fine frequency and...

Details Method and apparatus for coarse and fine frequency and... Method and apparatus for coarse and fine frequency and...

2004-07-06

2010-11-02

Ghayour, Mohammad H (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S260000, C375S344000, C375S345000, C375S346000, C375S355000, C375S362000, C375S364000, C375S365000, C375S366000, C370S509000, C370S510000, C370S511000, C370S512000, C370S513000, C370S514000

Reexamination Certificate

active

07826567

ABSTRACT:
Receivers (1) for receiving frequency signals are, to improve their time synchronization accuracy, provided with synchronization stages (20) for performing a coarse time synchronization through autocorrelating samples of a group of preamble symbols (t1,t2,t3) and a fine time synchronization through crosscorrelating samples of a further group of preamble symbols (t10,G1) with predefined samples. The synchronization stages (20) also perform a coarse and a fine frequency synchronization through detecting and accumulating phases of samples of a yet further group of preamble symbols (t8,t9) and of another group of preamble symbols (T1,T2). The synchronization stages (20) have buffering units (21) and controlling units (22) for controlling mixing units (11) and transformating units (12) in processing stages (10). The preamble symbols have ten short preamble symbols (t1-t10), a guard interval preamble symbol (G1) and two training symbols (T1,T2).

REFERENCES:
patent: 6137847 (2000-10-01), Stott et al.
patent: 6754170 (2004-06-01), Ward
patent: 7286617 (2007-10-01), Vanderperren et al.
patent: 2002/0071509 (2002-06-01), Richards et al.
patent: 1071251 (2001-01-01), None
patent: WO 0077961 (2000-12-01), None
patent: WO0077961 (2000-12-01), None
patent: WO 0191393 (2001-11-01), None

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