Multiplex communications – Generalized orthogonal or special mathematical techniques
Reexamination Certificate
2005-04-07
2008-12-09
Milord, Marceau (Department: 2618)
Multiplex communications
Generalized orthogonal or special mathematical techniques
C370S208000, C370S210000, C370S329000, C370S344000, C370S207000, C370S342000, C370S335000, C375S260000, C375S340000, C375S316000, C375S347000, C375S296000, C455S067110, C455S067160, C455S063100
Reexamination Certificate
active
07463576
ABSTRACT:
Techniques to estimate the frequency response of a wireless channel in an OFDM system. In one method, an initial estimate of the frequency response of the wireless channel is obtained for a first group of subbands based on a pilot transmission received via the subbands in the first group. An estimate of the impulse response of the wireless channel is then derived based on the initial frequency response estimate. An enhanced estimate of the frequency response of the wireless channel is then derived for a second group of subbands based on the impulse response estimate. The first and second groups may each include all or only a subset of the usable subbands. Subband multiplexing may be used to allow simultaneous pilot transmissions by multiple terminals on their associated groups of subbands.
REFERENCES:
patent: 5511233 (1996-04-01), Otten
patent: 6104926 (2000-08-01), Hogg et al.
patent: 6430412 (2002-08-01), Hogg et al.
patent: 6430724 (2002-08-01), Laneman et al.
patent: 6449245 (2002-09-01), Ikeda et al.
patent: 6473393 (2002-10-01), Ariyavisitakul et al.
patent: 6477210 (2002-11-01), Chuang et al.
patent: 6487235 (2002-11-01), Hoole
patent: 6532256 (2003-03-01), Miller
patent: 6535715 (2003-03-01), Dapper et al.
patent: 6545997 (2003-04-01), Bohnke et al.
patent: 6549561 (2003-04-01), Crawford
patent: 6563858 (2003-05-01), Fakatselis et al.
patent: 6567374 (2003-05-01), Bohnke et al.
patent: 6594320 (2003-07-01), Sayeed
patent: 6597745 (2003-07-01), Dowling
patent: 6603801 (2003-08-01), Andren et al.
patent: 6618454 (2003-09-01), Agrawal et al.
patent: 6633616 (2003-10-01), Crawford
patent: 6636568 (2003-10-01), Kadous
patent: 6643281 (2003-11-01), Ryan
patent: 6654429 (2003-11-01), Li
patent: 6661832 (2003-12-01), Sindhushayana et al.
patent: 6674792 (2004-01-01), Sugita
patent: 6700865 (2004-03-01), Yamamoto et al.
patent: 6731614 (2004-05-01), Ohlson et al.
patent: 6751187 (2004-06-01), Walton et al.
patent: 6928062 (2005-08-01), Krishnan et al.
patent: 6977974 (2005-12-01), Geraniotis et al.
patent: 6990142 (2006-01-01), Chappaz
patent: 6996195 (2006-02-01), Kadous
patent: 7020110 (2006-03-01), Walton et al.
patent: 7027429 (2006-04-01), Laroia et al.
patent: 7027523 (2006-04-01), Jalali et al.
patent: 7039001 (2006-05-01), Krishnan et al.
patent: 7039004 (2006-05-01), Sun et al.
patent: 7058134 (2006-06-01), Sampath
patent: 7072413 (2006-07-01), Walton et al.
patent: 7092459 (2006-08-01), Sendonaris
patent: 7139320 (2006-11-01), Singh et al.
patent: 19701011 (1998-06-01), None
patent: 19747369 (1999-05-01), None
patent: 2350753 (2000-12-01), None
patent: 2150174 (2000-05-01), None
patent: 04040813 (2004-05-01), None
International Search Report - PCT/US03/034506-International Search Authority -United States, Apr. 9, 2004.
International Search Report PCT/US03/034507—International Search Authority—United States Patent Office Mar. 26, 2004.
Kadous Tamer
Krishnan Ranganathan
Milord Marceau
Minhas Sandip S.
QUALCOMM Incorporated
Rouse Thomas R.
Zhu Peng
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