Pulse or digital communications – Spread spectrum
Reexamination Certificate
2005-02-15
2005-02-15
Chin, Stephen (Department: 2634)
Pulse or digital communications
Spread spectrum
C375S134000, C375S142000, C375S150000, C370S320000
Reexamination Certificate
active
06856643
ABSTRACT:
A method for estimating symbol sequences from multiple transmitters which communicate with common receivers sharing the same medium is disclosed. This invention can be used in wireless communications and wireline communications such as in cable modem sys terms and digital subscriber loops to speed up joint detection of symbol sequences of multiple transmitters to achieve low error probability. For convenience, only applications of this invention to wireless communications employing multiple antennas are described herein. The requirement for matrix operations like matrix inverses increase with the logarithm of the number of symbols instead of the number of symbols as with techniques based on Cholesky decomposition.
REFERENCES:
patent: 6301293 (2001-10-01), Huang et al.
patent: 6397066 (2002-05-01), Servi
patent: 20020021335 (2002-02-01), Sugama et al.
patent: 20020141372 (2002-10-01), De et al.
patent: 20020141373 (2002-10-01), De et al.
patent: 20030026236 (2003-02-01), De et al.
patent: 20030026325 (2003-02-01), De et al.
patent: 20030218998 (2003-11-01), Kim et al.
“Unified architecture for divide and conquer based tridiagonal System Solvers” Lopez, J.; Zapata, E.L.; Computers, IEEE Transactions on, vol.: 43, Issue: 12 , Dec. 1994 pp.: 1413-1425□□.*
Lupas et al., “Linear Multiuser Detectors for Synchronous Code-Division Multiple-Access Channels,” Jan. 1989, pp. 123-136.
Alexander et al., “On the Windowed Cholesky Factorization of the Time-Varying Asynchronous CDMA Channel,” Jun. 1998, pp. 735-737.
Sweet, “A Cyclic Reduction Algorithm for Solving Block Tridiagonal Systems of Arbitrary Dimension,” Sep. 1977, pp. 706-720.
Zvonar et al., “Suboptimal Multiuser Detector for Frequency-Selective Rayleigh Fading Synchronous CDMA Channels,” Feb. 1995, pp. 154-157.
Bravo, “Limited Linear Cancellation of Multiuser Interference in DS/CDMA Asynchronous Systems,” Nov. 1997, pp. 14351443.
Xie et al., “A Family of Suboptimum Detectors for Coherent Multiuser Communications,” May 1990, pp. 683-690.
Xu Guanghan
Yang Weidong
Chin Stephen
Cwill Telecommunications, Inc.
Hood Jeffrey C.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
Vartanian Harry
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