Pulse or digital communications – Transceivers – Modems
Reexamination Certificate
2006-11-07
2006-11-07
Tse, Young T. (Department: 2637)
Pulse or digital communications
Transceivers
Modems
C375S231000, C370S290000, C370S292000, C379S406100
Reexamination Certificate
active
07133442
ABSTRACT:
Rapid identification and modeling of transmission media channel characteristics of a communications system using a correlation based technique. The technique provides a known training sequence used to generate a known quantity that operates on an observed or measured received signal, which is a function of the training sequence and the channel's impulse response, to give an estimate of the model of the channel. The technique decouples the training sequence from the observed or measured output, leaving the estimated impulse response. The impulse response of the transmission media channel is rapidly computed and processed to set the initial values of filter coefficients, for example, an echo canceller and an equalizer, in the communications system. Once the coefficients are initialized, if needed, a standard technique, such as least mean square (LMS) correlation, can be used to fine-tune the coefficients to converge on or model the transmission media channel's characteristics.
REFERENCES:
patent: 5263033 (1993-11-01), Seshadri
patent: 5675612 (1997-10-01), Solve et al.
patent: 5742642 (1998-04-01), Fertner
patent: 5862156 (1999-01-01), Huszar et al.
patent: 6118814 (2000-09-01), Friedman
patent: 6320901 (2001-11-01), Arad et al.
patent: 6466616 (2002-10-01), Stenstrom et al.
patent: 6504884 (2003-01-01), Zvonar
patent: 6603811 (2003-08-01), Dobson et al.
patent: 6928107 (2005-08-01), Olafsson et al.
patent: 2002/0154688 (2002-10-01), Pollmann et al.
Turner, Steven E.,Echo Cancellation for High-Speed Dial-Up Applications: Part I, Telecommunications Magazine, pp. 80, 83, 85-86, and 104 (1988).
Douglas, Jack,V.32 modems are breaking through the echo barrier, Data Communications Magazine, pp. 187-194 (Apr. 1988).
G. Long, and F. Ling,Fast Initialization of Data-Driven Nyquist In-Band Echo Cancellers, IEEE Transactions on Communications, vol. 41, No. 6, pp. 1 and 893-904 (Jun. 1993).
P. Chevillat, D. Maiwald, and G. Underboeck,Rapid Training of a Voiceband Data-Modem Receiver for Employing an Equalizer with Fractional-T Spaced Coefficients, IEEE Transactions on Communications, vol. COM-35, No. 9, pp. 869-876 (Nov. 1987).
J. Wang, and J. Werner,Performance Analysis of an Echo-Cancellation Arrangement that Compensates for Frequency Offset in the Far Echo, IEEE Transactions on Communications, vol. 36, No. 3, pp. 364-372 (Mar. 1988).
F. Ling, and G. Long,Correlation-based fast training of data-driven Nyquist in-band echo cancellers, IEEE International Conference on Communications, Conference Record, vol. 4 of 4, pp. 1280-1284 (©1990).
Turner, Steven E.,Echo Cancellation for High-Speed Dial-Up Applications: Part I, Information Access Company, Section: No. 1, vol. 22; p. 80; 4 pages, (Jan. 1988).
Turner, Steven E.,Echo Cancellation for High-Speed Dial-Up Applications: Part II, Data Communications Magazine, pp. 83-87 and 96 (Feb. 1988).
O. Macchi and K. Park,An Echo Canceller with Controlled Power for Frequency Offset Correction, IEEE Transactions on Communications, vol. COM-34, No. 4, pp. 408-411 (Apr. 1986).
T. Quatieri and G. O'Leary,Far-Echo Cancellation in the Presence of Frequency Offset, IEEE Transactions on Communications, vol. 37, No. 6, pp. 635-644 (Jun. 1989).
LandOfFree
Rapid identification of transmission media channel... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rapid identification of transmission media channel..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rapid identification of transmission media channel... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3637725