Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2008-07-08
2008-07-08
Burd, Kevin (Department: 2611)
Pulse or digital communications
Spread spectrum
Frequency hopping
Reexamination Certificate
active
11168210
ABSTRACT:
A base station having the strongest downlink signal is identified by utilizing a unique slope of a pilot tone hopping sequence being transmitted by a base station. Specifically, base station identification is realized by determining the slope of the strongest received pilot signal, i.e., the received pilot signal having the maximum energy. In an embodiment of the invention, the pilot tone hopping sequence is based on a Latin Squares sequence. With a Latin Squares based pilot tone hopping sequence, all a mobile user unit needs is to locate the frequency of the pilot tones at one time because the pilot tone locations at subsequent times can be determined from the slope of the Latin Squares pilot tone hopping sequence. The slope and initial frequency shift of the pilot tone hopping sequence with the strongest received power is determined by employing a unique maximum energy detector.
REFERENCES:
patent: 5867478 (1999-02-01), Baum et al.
patent: 6018317 (2000-01-01), Dogan et al.
patent: 6131016 (2000-10-01), Greenstein et al.
patent: 6282185 (2001-08-01), Hakkinen et al.
patent: 6473418 (2002-10-01), Laroia et al.
patent: 6961364 (2005-11-01), Laroia et al.
patent: 2001/0043578 (2001-11-01), Kumar et al.
patent: 2298360 (2000-09-01), None
patent: WO 97/26742 (1997-07-01), None
F. Tufvesson et al., “Pilot Assisted Estimation for OFDM in Mobile Cellular Systems”,IEEE, 0-7803-3659-Mar. 1997, pp. 1639-1643.
R. Negi et al., “Pilot Tone Selection for Channel Estimation in a Mobile OFDM System”,IEEE Transactions on Consumer Electronics, pp. 1122-1128, 1998.
EPC Search Report for European Application No. 0130316, Apr. 9, 2001.
J. Fernandez-Getino Garcia et al: “Efficient Pilot Patterns for Channel Estimation in OFDM Systems Over HF Channels”, VTC 1999-Fall, IEEE VTS 50st, Vehicular Technology Conference, Gateway to the 21th, Century Communications Village, Amsterdam, Sep. 19-22, 1999, IEEE Vehicular Technology Conference, New York, NY, U.S. A., vol. 4, Conf 50 , Sep. 19, 1999, pp. 2193-2197.
C.C. Wang et al: “Dynamic Channel Resource Allocation in Frequency Hopped Wireless Communication Systems”, Information Theory, 1994. Proceedings, 1994 IEEE International Symposium on Trondheim, Norway 27, June 1, Jul. 1994, New York, NY, U.S.A., IEEE, Jun. 27, 1994, p. 229.
D. S. Han et al: “On the Synchronization of MC-CDMA System for Indoor Wireless Communications”, VTC 1999-Fall, IEEE VTS 50th, Vehicular Technology Conference; Gateway to the 21stCentury Communications Village, Amsterdam, Sep. 19-22, 1999, IEEE Vehicular Technology Conferenc, New York, NY, U.S. A, vol. 2, Conf. 50, Sep. 1999, pp. 693-697.
K. Fazel et al: “A Flexible and High Performance Cellular Mobile Communications System Based on Orthogonal Multi-Carrier SSMA”, Wireless Personal Communications, Kluwer Academic Publishers, NL, vol. 2, No. ½, 1995, pp. 121-144.
Laroia Rajiv
Li Junyi
Rangan Sundeep
Viswanath Pramod
Burd Kevin
Franks Ross L.
Huffaker David J.
QUALCOMM Incorporated
Rouse Thoms
LandOfFree
Base station identification in orthogonal frequency division... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Base station identification in orthogonal frequency division..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Base station identification in orthogonal frequency division... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3957564