Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2003-10-15
2009-08-25
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
Reexamination Certificate
active
07580448
ABSTRACT:
The present invention is directed to an efficient method and apparatus for channel determination and interference vector construction in accordance with spread spectrum systems. Channel determination is performed using a first series of fast Walsh transform steps. The results of the first set of fast Walsh transform steps corresponding to valid communication system channels are compared to a threshold value. Results derived from the first set of fast Walsh transform steps are then passed through a second set of fast Walsh transform steps with the number of steps performed for a set of results determined by the symbol length associated with the channels from which the amplitude information was derived. The interference vectors thus obtained for each valid symbol length may then be combined to form a composite interference vector. The fast Walsh transform steps and other steps may be performed using shared hardware components or software modules.
REFERENCES:
patent: 3742201 (1973-06-01), Groginsky
patent: 4088955 (1978-05-01), Baghdady
patent: 4309769 (1982-01-01), Taylor, Jr.
patent: 4359738 (1982-11-01), Lewis
patent: 4601046 (1986-07-01), Halpern
patent: 4665401 (1987-05-01), Garrard et al.
patent: 4670885 (1987-06-01), Parl et al.
patent: 4713794 (1987-12-01), Byington et al.
patent: 4780885 (1988-10-01), Paul et al.
patent: 4856025 (1989-08-01), Takai
patent: 4893316 (1990-01-01), Janc et al.
patent: 4922506 (1990-05-01), McCallister et al.
patent: 4933639 (1990-06-01), Barker
patent: 4965732 (1990-10-01), Roy, III et al.
patent: 5017929 (1991-05-01), Tsuda
patent: 5099493 (1992-03-01), Zeger et al.
patent: 5105435 (1992-04-01), Stilwell
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5119401 (1992-06-01), Tsujimoto
patent: 5136296 (1992-08-01), Roettger et al.
patent: 5151919 (1992-09-01), Dent
patent: 5218359 (1993-06-01), Minamisono
patent: 5218619 (1993-06-01), Dent
patent: 5220687 (1993-06-01), Ichikawa et al.
patent: 5224122 (1993-06-01), Bruckert
patent: 5237586 (1993-08-01), Bottomley
patent: 5263191 (1993-11-01), Dickerson
patent: 5280472 (1994-01-01), Gilhousen et al.
patent: 5305349 (1994-04-01), Dent
patent: 5325394 (1994-06-01), Bruckert
patent: 5343493 (1994-08-01), Karimullah
patent: 5343496 (1994-08-01), Honig et al.
patent: 5347535 (1994-09-01), Karasawa et al.
patent: 5353302 (1994-10-01), Bi
patent: 5377183 (1994-12-01), Dent
patent: 5386202 (1995-01-01), Cochran et al.
patent: 5390207 (1995-02-01), Fenton et al.
patent: 5394110 (1995-02-01), Mizoguchi
patent: 5396256 (1995-03-01), Chiba et al.
patent: 5437055 (1995-07-01), Wheatley, III
patent: 5440265 (1995-08-01), Cochran et al.
patent: 5448600 (1995-09-01), Lucas
patent: 5481570 (1996-01-01), Winters
patent: 5506865 (1996-04-01), Weaver, Jr.
patent: 5513176 (1996-04-01), Dean et al.
patent: 5533011 (1996-07-01), Dean et al.
patent: 5553098 (1996-09-01), Cochran et al.
patent: 5602833 (1997-02-01), Zehavi
patent: 5644592 (1997-07-01), Divsalar
patent: 5736964 (1998-04-01), Ghosh et al.
patent: 5787130 (1998-07-01), Kotzin et al.
patent: 5844521 (1998-12-01), Stephens et al.
patent: 5859613 (1999-01-01), Otto
patent: 5872540 (1999-02-01), Casabona
patent: 5872776 (1999-02-01), Yang
patent: 5894500 (1999-04-01), Bruckert et al.
patent: 5926761 (1999-07-01), Reed et al.
patent: 5930229 (1999-07-01), Yoshida et al.
patent: 5953369 (1999-09-01), Suzuki
patent: 5978413 (1999-11-01), Bender
patent: 5995499 (1999-11-01), Hottinen et al.
patent: 6002727 (1999-12-01), Uesugi
patent: 6014373 (2000-01-01), Schilling et al.
patent: 6018317 (2000-01-01), Dogan et al.
patent: 6032056 (2000-02-01), Reudink
patent: 6088383 (2000-07-01), Suzuki et al.
patent: 6101385 (2000-08-01), Monte et al.
patent: 6104712 (2000-08-01), Robert et al.
patent: 6115409 (2000-09-01), Upadhyay et al.
patent: 6127973 (2000-10-01), Choi et al.
patent: 6131013 (2000-10-01), Bergstrom et al.
patent: 6137788 (2000-10-01), Sawahashi et al.
patent: 6141332 (2000-10-01), Lavaen
patent: 6154443 (2000-11-01), Huang et al.
patent: 6157685 (2000-12-01), Tanaka et al.
patent: 6157842 (2000-12-01), Kaisson et al.
patent: 6157847 (2000-12-01), Buehrer et al.
patent: 6163696 (2000-12-01), Bi et al.
patent: 6166690 (2000-12-01), Lin et al.
patent: 6172969 (2001-01-01), Kawakami et al.
patent: 6173008 (2001-01-01), Lee
patent: 6175587 (2001-01-01), Madhow et al.
patent: 6192067 (2001-02-01), Toda et al.
patent: 6201799 (2001-03-01), Huang et al.
patent: 6215812 (2001-04-01), Young et al.
patent: 6219376 (2001-04-01), Zhodzishsky et al.
patent: 6222828 (2001-04-01), Ohlson et al.
patent: 6230180 (2001-05-01), Mohamed
patent: 6233229 (2001-05-01), Ranta et al.
patent: 6233459 (2001-05-01), Sullivan et al.
patent: 6240124 (2001-05-01), Wiedeman et al.
patent: 6252535 (2001-06-01), Kober et al.
patent: 6256336 (2001-07-01), Rademacher et al.
patent: 6259688 (2001-07-01), Schilling et al.
patent: 6263208 (2001-07-01), Chang et al.
patent: 6266529 (2001-07-01), Chheda
patent: 6275186 (2001-08-01), Kong
patent: 6278726 (2001-08-01), Mesecher et al.
patent: 6282231 (2001-08-01), Norman et al.
patent: 6282233 (2001-08-01), Yoshida
patent: 6285316 (2001-09-01), Nir et al.
patent: 6285319 (2001-09-01), Rose
patent: 6285861 (2001-09-01), Bonaccorso et al.
patent: 6295311 (2001-09-01), Sun
patent: 6301289 (2001-10-01), Bejjani et al.
patent: 6304618 (2001-10-01), Hafeez et al.
patent: 6308072 (2001-10-01), Labedz et al.
patent: 6310704 (2001-10-01), Dogan et al.
patent: 6317453 (2001-11-01), Chang
patent: 6321090 (2001-11-01), Soliman
patent: 6324159 (2001-11-01), Mennekens et al.
patent: 6327471 (2001-12-01), Song
patent: 6330460 (2001-12-01), Wong et al.
patent: 6333947 (2001-12-01), van Heeswyk et al.
patent: 6351235 (2002-02-01), Stilp
patent: 6351642 (2002-02-01), Corbett et al.
patent: 6359874 (2002-03-01), Dent
patent: 6362760 (2002-03-01), Kober et al.
patent: 6363104 (2002-03-01), Bottomley
patent: 6377636 (2002-04-01), Paulraj et al.
patent: 6380879 (2002-04-01), Kober et al.
patent: 6385264 (2002-05-01), Terasawa
patent: 6396804 (2002-05-01), Odenwalder
patent: 6404760 (2002-06-01), Holtzman et al.
patent: 6430216 (2002-08-01), Kober et al.
patent: 6459693 (2002-10-01), Park et al.
patent: 6501788 (2002-12-01), Wang
patent: 6515980 (2003-02-01), Bottomley
patent: 6570909 (2003-05-01), Kansakoski
patent: 6574270 (2003-06-01), Madkour
patent: 6580771 (2003-06-01), Kenney
patent: 6584115 (2003-06-01), Suzuki
patent: 6590888 (2003-07-01), Ohshima
patent: 6668011 (2003-12-01), Li et al.
patent: 6680727 (2004-01-01), Butler
patent: 6798737 (2004-09-01), Dabak
patent: 6801565 (2004-10-01), Bottomley
patent: 2001/0003443 (2001-06-01), Velazquez et al.
patent: 2001/0020912 (2001-09-01), Naruse et al.
patent: 2001/0021646 (2001-09-01), Antonucci et al.
patent: 2001/0046266 (2001-11-01), Rakib et al.
patent: 2002/0001299 (2002-01-01), Petch et al.
patent: 2002/0051433 (2002-05-01), Affes et al.
patent: 2002/0172173 (2002-11-01), Schilling et al.
patent: 2002/0176488 (2002-11-01), Kober et al.
patent: 2002/0191676 (2002-12-01), O'Hagan
patent: 2003/0053526 (2003-03-01), Reznik
patent: 4201439 (1993-07-01), None
patent: 4326843 (1995-02-01), None
patent: 4343959 (1995-06-01), None
patent: 0558910 (1993-01-01), None
patent: 0610989 (1994-01-01), None
patent: 2280575 (1995-02-01), None
patent: 2000-13360 (2000-01-01), None
patent: WO 93/12590 (1995-06-01), None
Mitra, et al., Adaptive Decorrelating Detectors for CDMA Systems, Accepted for Wireless Communications Journal, Accepted May 1995.
Schneider, Optimum Detection of Code Division Multiplexed Signals, IEEE Transactions on Aerospace and Electronic Systems, Jan. 1979, vol. AES-15 No. 1.
Mitra, et al., Adaptive Receiver Algorithms for Near-Far Resistant CDMA, IEEE Transactions of Communications, Apr. 1995.
Lupas, et al. Near-Far Resistance of Multiuser Detectors in Asynchronous Channels, IEEE Transactions on Communications, Apr. 1990, vol. 38, No. 4.
Lupas, et al., Linear Multiuser Detectors for Synchronous Code-Division Multiple-Access Channels, IEEE Transactions on Information Theory, Jan. 1989, vol. 35, No. 1.
Jain Prashant
Narayan Anand P.
Ahn Sam K
Narayan Anand P.
TENSORCOMM, Inc
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