Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2005-07-26
2005-07-26
Chin, Stephen (Department: 2634)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S343000, C375S371000
Reexamination Certificate
active
06922452
ABSTRACT:
Doppler spread associated with a Rayleigh or fast fading channel established between a radio base station and a mobile radio station is estimated. In particular, the Doppler spread is estimated through calculation of the autocorrelation function of a sequence of complex channel estimates determined from a known sequence in the received signal. More specifically, a sequence of complex channel estimates obtained from the known sequence in a first sampling interval is complex conjugated and then correlated with a sequence of complex channel estimates obtained from the known reference in a second sampling interval which have been not been complex conjugated. A zero crossing of the complex autocorrelation function is detected, and the estimated Doppler spread is calculated using this zero crossing and a Bessel function.
REFERENCES:
patent: 6058261 (2000-05-01), Rapeli
patent: 6563861 (2003-05-01), Krasny et al.
patent: 6680967 (2004-01-01), Westman
patent: 6680969 (2004-01-01), Molnar et al.
patent: 11234190 (1999-08-01), None
patent: 00/57568 (2000-09-01), None
patent: 01/13537 (2001-02-01), None
IEEE Communications Letter, IEEE Service Center, Piscataway, US, vol. 2, No. 12, Jan. 1999, pp. 327-330, XP000793122, M. Morelli et al., “Further Results in Carrier Frequency Estimation for Transmissions Over Flat Fading Channels”.
2000 IEEE Wireless Communications and Networking Conference, Conference Record (Cat. No. 00TH8540), Proceedings of IEEE Conference on Wireless Communications and Networking, Chicago, Illinois, US, pp. 1075-1079, vol. 3, XP002184721, Sep. 23-28, 2000, Piscataway, NJ, USA, IEEE, USA, ISBN: 0-7803-6596-8, H. Arslan et al., “Doppler Spread Estimation for Wireless Mobile Radio Systems”.
Communication Theory Mini-Conference, 1999, Vancouver, British Columbia, Canada, Jun. 6-10, 1999, Piscataway, NJ, USA, IEEE, US, Jun. 6, 1999, pp. 89-95, XP010351136, ISBN: 0-7803-5653-5, Sébastian Roy et al., “Modeling the narrowband base station correlated diversity channel”.
International Preliminary Examination Report PCT/SE02/00587.
IEEE 1999, David Mottier et al., “A Doppler Estimation for UMTS-FDD Based on Channel Power Statistics”, pp. 3052-3056.
Chin Stephen
Nixon & Vanderhye P.C.
Odom Curtis
Telefonaktiebolaget L M Ericsson (publ)
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