Pulse or digital communications – Transceivers
Patent
1997-05-30
2000-02-29
Bocure, Tesfaldet
Pulse or digital communications
Transceivers
375231, 375233, H04B 138
Patent
active
06031866&
ABSTRACT:
A system for equalization of two-way digital communications between a base and portable unit is described. Equalization is implemented in a manner so as to reduce the complexity of the portable unit. The reverse link (portable to base transmission) is equalized by a decision feedback equalizer (DFE). The forward link (base to portable) is equalized by an asymmetric decision feedback equalizer (ADFE), which consists of a forward filter located at the transmitter, and a decision feedback filter at the receiver.
REFERENCES:
patent: 3593142 (1971-07-01), Freeny et al.
patent: 4394768 (1983-07-01), Sari
patent: 4535443 (1985-08-01), Korevaar
patent: 4760596 (1988-07-01), Agrawal et al.
patent: 4969162 (1990-11-01), Karr
patent: 5199047 (1993-03-01), Koch
patent: 5228058 (1993-07-01), Ushriokawa et al.
patent: 5297169 (1994-03-01), Backstroom et al.
patent: 5751768 (1998-05-01), Guglielmi et al.
patent: 5812594 (1998-09-01), Rakib
An Asymmetric Equalization Structure for Broadband Indoor Wireless Data Communications, M.R. Gibbard, A. Sesay and L. Strawczynski, The Sixth International Conference on Wireless Communications, Proceedings, vol. 2, pp. 521-535, Jul. 11-13, 1994.
Nonlinear phase precoding for personal communications, W. Zhuang and V. Huang, Electronics Letters, Nov. 24, 1994, vol. 30, No. 24, pp. 2010-2011.
Least sum of squared errors (LSSE) channel estimation, S.N. Crozier, D.D. Falconer, S.A. Mahmoud, IEE Proceedings--F, vol. 138, No. 4, Aug. 1991, pp. 371-378.
Adaptive Filter Theory, Second Edition, Simon Haykin, Chapter 13, Standard Recursive Least-Squares Estimation, pp. 477-486, copyright 1991, 1986 by Prentice-Hall, Inc.
Adaptive channel precoding for personal communications, W. Zhuang, W.A. Krzymein and P.A. Goud, Electronics Letters, Sep. 15, 1994, vol. 30, No. 19, pp. 1570-1571.
On the Structure and Performance of a Linear Decision Feedback Equalizer Based on the Minimum Error Probability Criterion, E. Shamash, K. Yao, in Conf. Res. ICC-74, (Minneapolis, MN, U.S.A., Jul. 17-19, 1974.), pp. 25F-1-25F-5.
Design of Transmitter and Receiver Filters for Decision Feedback Equalization, by Andres C. Salazar, Copyright 1974 American Telephone Journal, vol. 53, No. 3, Mar. 1974, pp. 503-523.
Asymmetric Equalization of the Indoor Wireless Channel, Kevin S. Oler, Brent R. Petersen, Abu B. Sesay, 18th Biennial Symposium on Communications, Jun. 3-5, 1996, Dept. of Electrical & Computer Engineering, Queens' University, Kingston, Ontario, 4 pages.
Computer search document IN951205 listing publications found using key words precoding/pre-coding/asymmet/transmit/preequali/pre-equali/decision/ feedback, 34 pages.
Computer search document PA960123 listing patents found using key words preequali, 124 pages.
Computer search document PA960228 listing patents that referenced Freeny et al, U.S. Patent No. 3,593,142, Jul. 13, 1971. 38 pages.
Computer search document PA960325 listing patents that referenced Korevaar, U.S. Patent No. 4,535,443, Aug. 13, 1985 and Karr, U.S. Patent No. 4,969,162, Nov. 6, 1990, 42 pages.
Oler Kevin S.
Petersen Brent R.
Sesay Abu B.
Bocure Tesfaldet
Telecommunications Research Laboratories
LandOfFree
Duplex decision feedback equalization system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Duplex decision feedback equalization system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Duplex decision feedback equalization system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-689730