Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2003-04-11
2008-12-02
Lugo, David B (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S229000, C375S346000
Reexamination Certificate
active
07460582
ABSTRACT:
The invention relates to a method and device for the joint detection of data transmitted by direct sequence spread spectrum (DSSS).The device comprises means of using a Cholesky decomposition to calculate a matrix U such that:in-line-formulae description="In-line Formulae" end="lead"?L=UH×U, wherein-line-formulae description="In-line Formulae" end="tail"?L is an equalization matrix and U is an upper triangular matrix. The means for using a Cholesky decomposition comprise MAC cells (MAC1, MAC2, . . . , MACN) and a diagonal cell (DIAG) of a systolic network. The MAC cells and the diagonal cell are also used to calculate an estimated vector {circumflex over (d)} of received data.For example, the invention applies to the field of digital mobile phone transmissions.
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patent: 7079607 (2006-07-01), Brunel
patent: 99/65160 (1999-12-01), None
“Algorithms for VLSI Processor Arrays”, 1980, Addison-Wesley, (Kung, H.T. and Leiserson, C.E., Chapter Systolic Arrays for VLSI-Chap. 8.3), pp. 271-292.
Kung, H.T., “Systolic Algorithms and Their Implementation”, 1984, Proceedings of the Seventeenth Hawaii International Conference on System Sciences, pp. 5-11.
Manjikian, Naraig, “A Vector Multiprocessor for Real-Time Multi-User Detection in Spread-Spectrum Communication”, Jul. 2000, IEEE International Conference on Application Specific Systems, Architectures and Processors, pp. 185-194.
Wang et al., “Adaptive Joint Multiuser Detection and Channel Estimation in Multipath Fading CDMA Channels”, 1998, Wireless Networks, vol. 4, pp. 453-470.
Bouvier des Noes Mathieu
Noguet Dominique
Commissariat a l''Energie Atomique
Connolly Bove & Lodge & Hutz LLP
Lugo David B
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