Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2006-05-23
2006-05-23
Fan, Chieh M. (Department: 2634)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S233000, C375S265000, C375S350000
Reexamination Certificate
active
07050513
ABSTRACT:
A novel and useful channel tracking mechanism operative to generate channel estimate updates on blocks of samples during reception of a message. The tracking mechanism is based on the weighted recursive least squares algorithm and implements the estimation process by recursively updating channel model parameters upon the arrival of new sample data. The mechanism is operative to update channel estimate information once per sample block. An interblock exponential weighting factor is also applied. The block length is chosen short enough to enable good tracking performance while being sufficiently long enough to minimize the overhead of generating preliminary decisions and of updating precalculated tables in the equalizer. The method of the invention can be performed in either hardware or software. A computer comprising a processor, memory, etc. is operative to execute software adapted to perform the channel tracking method of the present invention.
REFERENCES:
patent: 5231648 (1993-07-01), Driedger et al.
patent: 5436929 (1995-07-01), Kawas Kaleh
patent: 5790598 (1998-08-01), Moreland et al.
patent: 6084929 (2000-07-01), Molnar et al.
patent: 6320919 (2001-11-01), Khayrallah et al.
patent: 6347125 (2002-02-01), Dent
patent: 6775322 (2004-08-01), Zangi et al.
Haykin, Simon, Adaptive Filter Theory, Prentice Hall, 1996, pp. 276-280, 562-588.
Press, William, et al., Numerical Recipes in C, The Art of Scientific Computing, Cambridge University Press, 1992, pp. 96-97.
Raheli, Riccardo, et al., “Per-Survivor Processing and Tentative Decisions: What Is In Between?”, IEEE Transactions on Communications, vol. 44, No. 2, pp. 127-129, Feb. 1996.
Baccarelli, Enzo, et al., “A Novel Adaptive Receiver with Enhanced Channel Tracking Capability for TDMA-Based Mobile Radio Communications”, IEEE Journal on Selected Areas in Communications, vol. 16, No. 9, pp. 1630-1639, Dec. 1998.
Castellini, Guido, et al., “A Continuously Adaptive MLSE Receiver for Mobile Communications: Algorithm and Performance”, IEEE Transactions on Communications, vol. 45, No. 1, pp. 80-89, Jan. 1997.
Han, Youngyearl, “On The Minimization of Overhead in Channel Impulse Response Measurement”, IEEE Transactions on Vehicular Technology, vol. 47, No. 2, pp. 631-636, May 1998.
Boss, Dieter, et al., “Impact of Blind Versus Non-Blind Channel Estimation on the BER Performance of GSM Receivers”, IEEE Signal Processing Workshop on Higher-Order Statistics, pp. 62-66, Jul. 21-23, 1997.
Mehrotra, Asha, GSM System Engineering, Artech House Inc., 1997, pp. 169-245.
Haykin, Simon, Adaptive Filter Theory, Prentice Hall, 1996, pp. 483-535.
U.S. Appl. No. 09/616,161, filed Jul. 14, 2000, Yakhnich et al.
Comsys Communications & Signal Processing Ltd.
Fan Chieh M.
Ware Cicely
Zaretsky Howard
Zaretsky & Associates PC
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