Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
2005-08-16
2005-08-16
Ton, Dang (Department: 2666)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
C370S503000
Reexamination Certificate
active
06930995
ABSTRACT:
A method, apparatus and system detects a loss of synchronization between a transmitter and a receiver in a multiple-carrier communication system such as an OFDM system. A plurality of synchronization indicators are observed to determine whether a loss of synchronization between a transmitter and a receiver in the wireless system has occurred. In one embodiment, the receiver is determined to have lost synchronization with the transmitter if two or more of the three synchronization indicators indicate a loss of synchronization. In such an embodiment, the three synchronization indicators include a timing error indicator, an energy guard band indicator and a phase-frequency slope indicator.
REFERENCES:
patent: 3780230 (1973-12-01), Bowen et al.
patent: 5351235 (1994-09-01), Lahtinen
patent: 5596582 (1997-01-01), Sato et al.
patent: 5610953 (1997-03-01), Betts et al.
patent: 5774450 (1998-06-01), Harada et al.
patent: 5790000 (1998-08-01), Dai et al.
patent: 5901180 (1999-05-01), Aslanis et al.
patent: 6101173 (2000-08-01), Bayley
patent: 6351498 (2002-02-01), Yamao et al.
patent: 6480558 (2002-11-01), Ottosson et al.
patent: 6738393 (2004-05-01), Miki et al.
patent: 0453203 (1991-04-01), None
patent: 0869648 (1998-10-01), None
patent: 0 877 526 (1998-11-01), None
patent: 2 324 447 (1998-10-01), None
patent: WO 98/19410 (1998-05-01), None
patent: WO 99/53667 (1999-10-01), None
patent: 9 803 646 (1999-02-01), None
Lawrey, Eric, OFDM Results, http://www.eng.jcu.edu.au/eric/thesis/Thesis, http://www.eng.jcu.edu.au/eric/thesis/chapter1.htm (Sep. 24, 1999), http://www.eng.jcu/edu.au/eric/thesis/chapter2.htm and http://www.eng.jcu.edu.au/eric/thesis/appendix.htm, Nov. 5, 1999 (56 pgs).
Speth, Michael, OFDM Receivers for Broadband- Transmission, OFMD, http://www.ert.rwth-aachen.de/Projekte/Theo/OFDM/www_ofdm.html.....node1.html through node9.html, Nov. 8, 1999 (15 pgs).
Speth, Michael, et al., “Broadband Transmission Using ODM:System Performance and Receiver Complexity”, (7 pgs) (date unknown).
PCT, International Search Report for PCT/US 00/16719, Nov. 1, 2000; Mailed Nov. 13, 2000, (8 pgs.).
Kim, Dong-Kyu, et al., “Performance Evaluation of the Frequency Detectors for Orthogonal Frequency Division Multiplexing”, IEEE Transactions of Consumer Electronics, vol. 43, No. 3, Aug. 1997, pp. 776-782.
Zaman, S.U., et al., “Use of the DFT for Synchronization in Packetized Data Communications”, IEEE, pp. III 261-264, Apr. 19, 1994.
Yooh, J.H., et al., “On Synchronizing and Detecting Multi-carrier CDMA Signals”, IEEE, pp. 512-516, Nov. 6, 1995.
Heinonen Jari M.
Hirano Michael R.
Cingular Wireless II LLC
Ton Dang
Tran Phuc
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