Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2006-01-31
2006-01-31
Deppe, Betsy L. (Department: 2637)
Pulse or digital communications
Receivers
Angle modulation
C375S344000
Reexamination Certificate
active
06993094
ABSTRACT:
A method and apparatus provide coarse frequency synchronization compensating for a carrier frequency deviation from an oscillator frequency in a demodulation system capable of demodulating a signal having a frame structure with at least one useful symbol and a reference symbol which is an amplitude-modulated sequence. A received and down-converted signal undergoes amplitude-demodulation to generate an envelope that is correlated with a predetermined reference pattern to determine the carrier frequency deviation. Finally, the oscillator frequency is controlled based on the carrier frequency deviation. The reference symbol may comprise two identical sequences. In this case, the envelope obtained by the amplitude-demodulation has two portions which are based on the identical sequences. One of the portions of the envelope is correlated with the other one of the portions in order to determine the carrier frequency deviation. The oscillator frequency is controlled based on the determined carrier frequency deviation.
REFERENCES:
patent: 5444697 (1995-08-01), Leung et al.
patent: 5594757 (1997-01-01), Rohani
patent: 5602835 (1997-02-01), Seki et al.
patent: 5717722 (1998-02-01), Mori
patent: 5745535 (1998-04-01), Mori
patent: 5936462 (1999-08-01), Muraishi
patent: 5991289 (1999-11-01), Huang et al.
patent: 6058101 (2000-05-01), Huang et al.
patent: 6359938 (2002-03-01), Keevill et al.
patent: 8251135 (1996-09-01), None
patent: 9800946 (1998-01-01), None
Moose, “A Technique for Orthogonal Frequency Division Multiplexing Frequency Offset Correction”,IEEE Transactions on Communications, vol. 42, No. 10, pp. 2908-2914 (Oct. 1994).
Keller and Hanzo, “Orthogonal Frequency Division Multiplex Synchronisation Techniques for Wireless Local Area Networks”,IEEEInternational Symposium on Personal, Indoor and Mobile Radio Communications, pp. 963-967 (Oct. 1996).
Classen and Meyr, “Synchronization Algorithms for an OFDM System for Mobile Communication”, Condierung für Quelle, Kanal and Übertragung: ITG-Fachbericht, pp. 105-114 (Oct. 1994).
Schmidl and Cox, “Low-Overhead, Low-Complexity [Burst] Synthronization for OFDM”,Proc. IEEEInt. Conf. on Commun., pp. 1301-1306 (1996).
Zou and Wu, “COFDM: An Overview”,IEEE Transactions on Broadcasting, vol. 41, No. 1, pp. 1-8 (Mar. 1995).
Palacherla, “DSP-μP Routine Computes Magnitude”,EDN Electrical Design News, vol. 34, No. 22, pp. 225-226 (Oct. 1989).
Adams and Brady, “Magnitude Approximations for Microprocessor Implementation”,IEEEMicro, vol. 3, No. 5, pp. 27-31 (Oct. 1983).
Luise and Reggiannini, “Carrier Frequency Acquisition and Tracking for OFDM Systems”,IEEE Transactionson Communications, vol. 44, No. 11, pp. 1590-1598 (Nov. 1996).
Tuisel and Kammeyer, “Carrier-Recovery for Multicarrier-Transmission Over Mobile Radio Channels”,Int. Conf. on Acoustics, Speech and Signal Processing(ICASSP 92), San Francisco, Band 4, pp. 677-680 (1992).
Onizawa, Mizoguchi, Kumagai, Takanashi, and Morikura, “Synchronization Scheme of OFDM Systems for High Speed Wireless LAN”,Technical Report of the Institute of Electronics, Information and Communication Engineers, vol. 97, No. 489, pp. 137-142 (Jan. 1998).
Badri Sabah
Buchholz Stephan
Eberlein Ernst
Gerhaeuser Heinz
Heuberger Albert
Deppe Betsy L.
Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung
Roylance, Abrams, Berdo & Goodman L.L.P
LandOfFree
Coarse frequency synchronization in multicarrier systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Coarse frequency synchronization in multicarrier systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coarse frequency synchronization in multicarrier systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3583531