Impairment compensation sequence for communication

Details Impairment compensation sequence for communication Impairment compensation sequence for communication

2008-07-08

2008-07-08

Odom, Curtis (Department: 2611)

Pulse or digital communications

Transceivers

Modems

C375S346000

Reexamination Certificate

active

07397845

ABSTRACT:
An impairment compensation sequence for use in a communication system susceptible to one or more potential impairments each periodic in an integer number of symbols includes N phases, wherein N is selected such that each potential impairment, if present, is periodic therein, and a sequence of symbols, the sequence organized to place at least one instance of each symbol from a predetermined set of symbols in each phase to allow detection of the potential impairments in each of the N phases. The potential impairments may include robbed-bit signaling and padding. Using estimates prepared based on such an impairment compensation sequence, individual phase intervals may be grouped according to similarity of apparent aggregate effect of the impairments thereon without identification of individual impairments active in the particular phases. Constellation points may then be assigned based on group characteristics corresponding to phase intervals. In an exemplary realization, constellation points are assigned for each of 6 constellation indices based on amplitude estimates characteristic of the groups with which each of 4 corresponding phase intervals are associated.

REFERENCES:
patent: 5265125 (1993-11-01), Ohta
patent: 5761247 (1998-06-01), Betts et al.
patent: 5801695 (1998-09-01), Townshend
patent: 5809075 (1998-09-01), Townshend
patent: 5835538 (1998-11-01), Townshend
patent: 5852630 (1998-12-01), Langberg et al.
patent: 5859872 (1999-01-01), Townshend
patent: 5864545 (1999-01-01), Gonikberg et al.
patent: 5875229 (1999-02-01), Eyuboglu et al.
patent: 5970103 (1999-10-01), Townshend
patent: 5991348 (1999-11-01), Alelyunas et al.
patent: 5999109 (1999-12-01), Norrell et al.
patent: 6104730 (2000-08-01), Marks
patent: 6108354 (2000-08-01), Scull et al.
patent: 6115395 (2000-09-01), Norrell et al.
patent: 6118813 (2000-09-01), Lai
patent: 6272171 (2001-08-01), Okunev et al.
patent: 6301296 (2001-10-01), Krishnan et al.
patent: 6332009 (2001-12-01), Olafsson
patent: 6512787 (2003-01-01), Tung et al.
patent: 6661847 (2003-12-01), Davis et al.
patent: 6721279 (2004-04-01), Zhang et al.
patent: 6721363 (2004-04-01), Qiu et al.
patent: 6724814 (2004-04-01), Green et al.
patent: WO 98/17044 (1997-10-01), None
patent: 98/45977 (1998-10-01), None
patent: WO 99/21288 (1998-10-01), None
patent: 99/12267 (1999-03-01), None
patent: 99/34504 (1999-07-01), None
patent: 99/34566 (1999-07-01), None
patent: 99/37051 (1999-07-01), None
patent: 99/38299 (1999-07-01), None
patent: 99/56156 (1999-12-01), None
patent: 99/65156 (1999-12-01), None
PN 3857 Draft 15, “North American Telephone Network Transmission Model for Evaluating Analog Client and Digitally Connected Server Modems,” Telecommunications Industry Association Standard Draft, May 2000, pp. i-97.
“A Digital Modem and Analogue Modem Pair for Use on the Public Switched Telephone Network (PSTN) at Data Signalling Rates of up to 56 000 Bit/s Downstream and up to 33,600 Bit/s Upstream,” Series V: Data Communication Over the Telephone Network, ITU-T, V.90, Sep. 1998, pp. 1-51.
U.S. Appl. No. 09/447,142, entitled “Deterministic Distortion Insensitive Adaptive Receiver Using Decision Updating,” filed Nov. 23, 1999 by inventor Mark Gonikberg, 28 pages.
U.S. Appl. No. 09/627,571, entitled “An Impairment Sensitive Selection of Constellation Points for Communication across a Channel,” filed Jul. 28, 2000 by inventor Haixiang Liang, 53 pages.
U.S. Appl. No. 09/627,572, entitled “Categorization of Impairments Affecting a Communication Channel,” filed Jul. 28, 2000 by inventor Haixiang Liang, 54 pages.

Affiliated with

Also associated with

Rating

Impairment compensation sequence for communication does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Impairment compensation sequence for communication, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impairment compensation sequence for communication will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2781383