Time domain equalizer for DMT modulation

Details Time domain equalizer for DMT modulation Time domain equalizer for DMT modulation

2006-04-18

2006-04-18

Chin, Stephen (Department: 2634)

Pulse or digital communications

Transceivers

C455S073000, C710S001000

Reexamination Certificate

active

07031379

ABSTRACT:
A method for deriving coefficients for a time domain equalizer function (24) as implemented by a digital signal processor (35) in a DSL modem (20) is disclosed. A transmitting modem (10), such as at a central office, issues a pseudo-random training sequence that is received by the receiving modem (20). Correlation matrices are derived by the digital signal processor (35), from which sets of eigenvalues and eigenvectors are derived. A flatness constraint on the frequency response of the time domain equalizer is established, and included with a flatness scaling factor (λ) into a minimization cost function. One or more values of the flatness scaling factor (λ), preferably between minimum and maximum eigenvalues, are evaluated in the cost function, to derive the optimum filter for the time-domain equalizer. The flatness constraint ensures that the time-domain equalizer is not subject to near null conditions and large variations in its frequency response.

REFERENCES:
patent: 5285474 (1994-02-01), Chow et al.
patent: 6219378 (2001-04-01), Wu
patent: 6226322 (2001-05-01), Mukherjee
patent: 6396886 (2002-05-01), Kapoor
patent: 6408022 (2002-06-01), Fertner
Van Kerckhove et al., “Adapted Optimization Criterion for FDM-based DMT-ADSL Equalization”, ICC 1996, pp. 1328-1334.
Arslan, et al., “Optimum Channel Shortening for Discrete Multitone Transceivers”,Proc. IEEE Int. Conf. on Acoustics, Speech, and Signal Processing,vol. 5 (Jun., 2000), pp. 2965-2968.
Farhang-Boroujeny et al., “Design Methods for Time Domain Equalizers in DMT Transceivers”,Trans. Comm., vol. 49, No. 3 (IEEE, 2001), pp. 554-562.
Cioffi,A Multicarrier Primer,T1E1.4/91-157, (Amati Comm. Corp. and Stanford University, Nov. 1991).
Bingham, “Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come”,IEEE Communications Magazine(May, 1990), pp. 5-14.
Chow et al., “A Discrete Multitone Transceiver System for HDSL Applications”,IEEE Journal on Selected Areas in Communications, vol. 9, No. 6 (Aug. 1991), pp. 895-908.
Al-Dhahir et al., “Optimum Finite-Length Equalization for Multicarrier Transceivers”,Trans. on Comm., vol. 44, No. 1 (IEEE, 1996), pp. 56-64.

Affiliated with

Also associated with

Rating

Time domain equalizer for DMT modulation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Time domain equalizer for DMT modulation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time domain equalizer for DMT modulation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3532889