Method and apparatus for channel estimation

Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C370S482000, C375S152000, C375S260000

Reexamination Certificate

active

07031250

ABSTRACT:
Various methods and systems efficiently implement broadband multi-carrier communication systems. The invention exploits the structural properties of a frequency-domain channel estimator and transforms it into the time domain. This allows the sharing of certain blocks of hardware (e.g., matched filters otherwise used for timing acquisition) which results in significant reduction of complexity.

REFERENCES:
patent: 5282222 (1994-01-01), Fattouche et al.
patent: 5487069 (1996-01-01), O'Sullivan et al.
patent: 5796814 (1998-08-01), Brajal et al.
patent: 5912876 (1999-06-01), H'mimy
patent: 5995499 (1999-11-01), Hottinen et al.
patent: 6002716 (1999-12-01), Meyer et al.
patent: 6061327 (2000-05-01), Demoulin et al.
patent: 6141393 (2000-10-01), Thomas et al.
patent: 6320901 (2001-11-01), Arad et al.
patent: 6442211 (2002-08-01), Hampel et al.
patent: 6687228 (2004-02-01), Fichou et al.
patent: 6731639 (2004-05-01), Ors et al.
patent: 6765969 (2004-07-01), Vook et al.
patent: 6826240 (2004-11-01), Thomas et al.
patent: 6856649 (2005-02-01), Birru
patent: 2002/0021773 (2002-02-01), Henriksson
patent: 2002/0027957 (2002-03-01), Paulraj et al.
patent: 2002/0034161 (2002-03-01), Deneire et al.
patent: 2002/0039383 (2002-04-01), Zhu et al.
patent: 2002/0122499 (2002-09-01), Kannan et al.
patent: 2002/0181390 (2002-12-01), Mody et al.
patent: 2003/0026223 (2003-02-01), Eriksson et al.
patent: 2005/0002468 (2005-01-01), Walton et al.
patent: 1 030 489 (2000-08-01), None
patent: 1 030489 (2000-08-01), None
Y. Li, L. J. Cimini and N.R. Sollenberger, “Robust Channel Estimation for OFDM Systems with Rapid Dispersive Fading Channels,”IEEE Trans. Commun., vol. 46(7), pp. 903-915, Jul. 1998.
O. Edfords, et al., “OFDM Channel Estimation by Singular Value Decomposition”,IEEE Trans. Commun., vol. 46(7), pp. 931-939, Jul. 1998.
M. H. Hsieh and C.H. Wei, “Channel Estimation for OFDM Systems based on Comp-Type Pilot Arrangement in Frequency Selective Fading Channels”,IEEE Trans. Consumer Electr., vol. 44(1), pp. 217-225, Feb. 1998.
Ye Li, et al., “Channel Estimation for OFDM Systems with Transmitter Diversity in Mobile Wireless Channels”,IEEE J. Select. Areas Commun., vol. 17(3), pp. 461-471, Mar. 1999.
W. G. Jeon, et al. “An Equalization Technique for Orthogonal Frequency-Division Multiplexing Systems in Time-Variant Multipath Channels”IEEE Trans. Commun., vol. 47(1), pp. 27-32, Jan. 1999.
Marco Luise, et al. “Blind Equlzation/Detection for OFDM Signals over Frequency-Selective Channels”,IEEE J. Select. Areas Commun., vol. 16(9), pp. 1568-1578, Oct. 1998.
J. Ahn, et al. “Frequency Domain Equalisation of OFDM Signals over Frequency Nonselective Rayleigh Fading Channels”Electronics Letter., vol. 29(16), pp. 1476-1477, pp. 1476-1477, Aug. 5, 1993.
Y. Sun and L. Tong, “Bandwidth efficient wireless OFDM”,Proc. 32nd Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, pp. 78-82, Nov. 1-4, 1998.
Y. Sun and L. Tong. “Channel Equalization using one-tap DFE for wirelss OFDM Systems with ICI and ISI”,Proc. 2nd IEEE Signal Processing Workshop on Signal Processing Advances in wireless communications, SPAWC'99, pp. 146-149, May 9-12, 1999.
Y. Sun and L. Tong, “A lower ordered HMM approach to blind sequence estimation”Proc. Conference on Military Communications, MILCOM'98, Bedford, MA, pp. 847-851, Oct. 18-21, 1998.
Y. Sun and L. Tong, “A Channel-Whitening Blind Sequence Estimation Algorithm”Proc. 1998 IEEE International Symposium on Information Theory, ISIT'98, MIT, p. 180, Aug. 16-21-, 1998.
A. J. Redfem and G. T. Zhou, “Nonlinear Channel Identification and Equalization for OFDM Systems”Proc. Intl. Conference on Acoustics, Speech, and Signal Processing(ICASSP'98)Seattle, WA, pp. 3521-3524.
Simon Armour, et al. “Complexity Evaluation for the Implementation of a Pre-FFT Equalizer in and OFDM Receiver” ,IEEE Int'l Conf. on Consumer Electronics, pp. 16-17, Jun. 2000.
A. Papathanassiou, et al. Novel Time-Domain Channel Estimation and Equalization for OFDM-based Wireless Indoor Communications Systems,Information Society Technologies, Mobile Summit 2000, Oct. 2000.
Jukka Rinna, et al. “An Improved Equalizing Scheme for Orthogonal Frequency Division Multiplexing Systems for Time-Variant Channels”IEEE, pp. 879-883, 1995.
P. Vandenameele, “Space Division Multiple Access for Wireless Local Area Networks”Katholieke Universiteit Leuven, Oct. 2000.
Vandenameele, “Space Division Multiple Access for Wireless Local Area Networks,”IMEC, Oct. 2000, Catholic University, Leuven Belgium.
U, et al., “Robust Channel Estimation for OFDM Systems with Rapid Dispersive Fading Channels,”IEEE Transactions on Communications, Jul. 1998, vol. 48, No. 7, pp. 902-915.
Jeon, et al., “An Equalization Technique for Orthogonal Frequency-Division Multiplexing Systems in Time-Variant Multipath Channels,”IEEE Transactions on Communications, Jan. 1999, vol. 47, No. 1, pp. 27-32.
Luise, et al., “Blind Equalization Detection for OFDM Signals over Frequency-Selective Channels,”IEEE Journal on Selected Areas in Communications, Oct. 1998, vol. 16, No. 8, pp. 1568-1578.
Hsieh, et al., “Channel Estimation for OFDM Systems Based on Comb-Type Pilot Arrangement in Frequency Selective Fading Channels,”IEEE Transactions on Consumer Electronics, Feb. 1998. vol. 44, No. 1, pp. 217-225.
U, et al., “Channel Estimation for OFDM Systems with Transmitter Diversity in Mobile Wireless Channels,”IEEE Journal on Selected Areas in Communications, Mar. 1999, vol. 17, No. 3, pp. 461-471.
Edfors, et al., “OFDM Channel Estimation by Singular Value Decomposition,”IEEE Transactions on Communications, Jul. 1998, vol. 48, No. 7, pp. 931-939.
Sun, et al., “Channel-Whitening Blind Sequence Estimation Algorithm,” ISIT Aug. 16-21, 1998,in Proc. 1998 IEEE International Symposium on Information Theory, MIT, Cambridge, MA,IEEE, 1998, vol.13. No.13. p. 180.
Sun, et al., “A Lower Ordered HMM Approach to Blind Sequence Estimation,”IEEE, 1998, vol.13. No.13. pp. 847-851.
Sun, et al., “Channel Equalization Using One-Tap DFE for Wireless OFDM Systems with ICI and ISI,”In Proc. 2nd IEEE Signal Processing Worshop on Signal Processing Advances in Wireless Communications, SPA WC'99 Annapolis, MD, May 9-12, 1999,IEEE, 1999, vol.13. No.13, pp. 146-149.
Ahn, et al., “Frequecy Domain Equalisation of OFDM Signals over Frequency Nonselective Rayleigh Fading Channels,”Electronics Letters, Aug. 5th, 1993, vol. 29, No. 16, pp. 1476-1477.
Sun, “Bandwidth Efficient Wireless OFDM,”in Proc. 32nd Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, No. 1-4, 1998,IEEE, vol.13, No.13, pp. 78-82.
Redfern, et al., “Nonlinear Channel Identification and Equalization for OFDM Systems,”in Proc. Intl. Conference on Acoustic, Speech, and Signal Processing, ICASSP '98, Seattle, WA,IEEE, vol.13, No.13, 1998, pp. 3521-3524.
Rinne, et al., “An Improved Equalizing Scheme for Orthogonal Frequency Division Multiplexing Systems for Time-Variant Channels,”in Proc. IEEE Global Telecommmunications Conference Globecom'95,Singapore.IEEE, vol.13, No.13, 1995, pp. 879-883.
Armour, et al., “Complexity Evaluation for Implementation for Implementation of a Pre-FFT Equalizer in an OFOM Receiver,”IEEE International Conference on Consumer Electronics, Jun. 2000,IEEE, vol.13, No.13, 2000, pp. 16-17.
Papathananassiou, et al., “Novel Time-Domain Channel Estimation and Equalization for OFDM-Based Wireless Indoor Communications Systems,”Information Society Technologies, Mobile Summut 2000, Oct. 2000.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for channel estimation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for channel estimation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for channel estimation will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3605573

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.