Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2008-04-08
2008-04-08
Tran, Khai (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
Reexamination Certificate
active
10434252
ABSTRACT:
The present invention provides a method and apparatus for estimating a multipath channel with sub-chip resolution. In general, secondary signals are characterized based on correlating a received signal including multipath signals, which include a main and the secondary signals, with a pseudo-random noise code. An inverse filter operates to increase a temporal resolution of results of the correlation of the received signal and the pseudo-random noise code, thereby allowing secondary multipath signals occurring within the same chip interval as another multipath signal to be detected and estimated correctly.
REFERENCES:
patent: 5077753 (1991-12-01), Grau, Jr. et al.
patent: 5361276 (1994-11-01), Subramanian
patent: 5414734 (1995-05-01), Marchetto et al.
patent: 5648983 (1997-07-01), Kostic et al.
patent: 5673286 (1997-09-01), Lomp
patent: 5689528 (1997-11-01), Tsujimoto
patent: 5692008 (1997-11-01), Van Nee
patent: 5706314 (1998-01-01), Davis et al.
patent: 5809060 (1998-09-01), Cafarella et al.
patent: 5995538 (1999-11-01), Lomp
patent: 6009089 (1999-12-01), Huang et al.
patent: 6069917 (2000-05-01), Werner et al.
patent: 6075812 (2000-06-01), Cafarella et al.
patent: 6269075 (2001-07-01), Tran
patent: 6333947 (2001-12-01), van Heeswyk et al.
patent: 6442193 (2002-08-01), Hirsch
patent: 6541950 (2003-04-01), Townsend et al.
patent: 6546041 (2003-04-01), Fujimoto
patent: 6563858 (2003-05-01), Fakatselis et al.
patent: 6647077 (2003-11-01), Shan et al.
patent: 6680968 (2004-01-01), Black et al.
patent: 6700929 (2004-03-01), Shan et al.
patent: 6728324 (2004-04-01), Shan et al.
patent: 6862326 (2005-03-01), Eran et al.
patent: 7103027 (2006-09-01), Dick et al.
patent: 2001/0006539 (2001-07-01), Kim
patent: 2002/0118731 (2002-08-01), Hakala
patent: 2003/0161416 (2003-08-01), Meyer et al.
patent: 2003/0179813 (2003-09-01), Morita et al.
patent: 2003/0231714 (2003-12-01), Kjeldsen et al.
patent: 2004/0001534 (2004-01-01), Yang
patent: 2004/0017846 (2004-01-01), Fernandez-Corbaton et al.
patent: 2004/0042531 (2004-03-01), Arikan et al.
patent: 2004/0052304 (2004-03-01), Reial
patent: 2004/0052306 (2004-03-01), Ibrahim et al.
patent: 2004/0071200 (2004-04-01), Betz et al.
patent: 2004/0208266 (2004-10-01), Lenosky
patent: 2004/0223540 (2004-11-01), Shan
patent: 0932263 (1999-07-01), None
patent: 0 981 206 (2000-02-01), None
patent: WO 98/26544 (1998-06-01), None
Lingwood et al. “ASIC implementation of a direct sequence spread spectrum RAKE receiver” IEEE 44th Vehicular Technology Conference, Jun. 8-10, 1997, pp. 1326-1330.
3COM Corporation, “IEEE 802.11b Wireless LANs,” http://www.3com.com/technology/tech—net/white—papers/503072a.html.
Andren, Carl and Webster, Mark, “CCK Modulation Delivers 11Mbps for High Rate IEEE 802.11 Extension,” Wireless Symposium/Portable by Design Conference Proceedings, Mar. 14, 2000, XP002147321.
Fuente, M. P., Guo, Y. J., and Barton, S.K., “A New Scheme for Direct Sequence Spread Spectrum Radio LANs,” IEEE 4th International Symposium, Mainz Germany, Sep. 22-25, 1996, XP010208831.
Hou, Wen-Shang, and Chen, Bor-Sen, “Adaptive Detection in Asynchronous Code-Division Multiple-Access System in Multipath Fading Channels,” IEEE Transactions on Communications, vol. 48, No. 5, May 2000, pp. 863-874.
Kim, Su II and Lee Hwang Soo, “Performance Improvement of RAKE Receiver for a Multicode DS-CDMA System with Multistage Interference Cancellation Detectors,” Proceedings of IEEE Tencon '99, Sep. 15-17, 1999, vol. 1, pp. 573-576.
Prasad, Ramjee and Ojanpera, Tero, “An Overview of CDMA Evolution Toward Wideband CDMA,” IEEE Communications Surveys, 1998, http://www.comsoc.org/pubs/surveys/4q98issue/prasad.html.
Lingwood, Stephen et al., “ASIC Implementaion of a Direct-Sequence Spread-Spectrum RAKE-Receiver,” IEEE 44thVehicular Technology Conference, Jun. 8-10, 1994, XP010123293.
Väisänen, Kari and Renfors, Markku, “Efficient Digital Filters for Pulse-Shaping and Jitter-Free Frequency Error Detection and Timing Recovery,” Signal Processing, vol. 81, No. 4, Apr. 2001 pp. 829-844, XP004234879.
International Search Report for PCT/US2004/014055 mailed Nov. 4, 2004.
Kostic, Zoran and Pavlovic, Gordana, “Resolving Subchip-Spaced Multipath Components in CDMA Communication Systems,” IEEE Transactions on Vehicular Technology, vol. 48, No. 6, Nov. 1999, pp. 1803-1808.
Kostic et al, “Estimation of the Parameters of a; Multipath Channel Using Set-Theoretic Deconvolution,” IEEE Trnasactions on Communications, vol. 40, No. 6, Jun. 1992, pp. 1006-1011.
Ehrenberg et al, “Final-processing Techniques for Resolving Individual Pulses in Multipath Signal,” Journal of the Acoustical Society of America, vol. 63, No. 6, Jun. 1978, pp. 1861-1865.
RF Micro Devices, Inc.
Tran Khai
Withrow & Terranova , PLLC
LandOfFree
Estimation of multipath channel with sub-chip resolution does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Estimation of multipath channel with sub-chip resolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Estimation of multipath channel with sub-chip resolution will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3958408