WO2000079723A8 - Digital impairment learning sequence - Google Patents

Digital impairment learning sequence

Info

Publication number
WO2000079723A8
WO2000079723A8 PCT/US2000/017195 US0017195W WO0079723A8 WO 2000079723 A8 WO2000079723 A8 WO 2000079723A8 US 0017195 W US0017195 W US 0017195W WO 0079723 A8 WO0079723 A8 WO 0079723A8
Authority
WO
WIPO (PCT)
Prior art keywords
learning sequence
digital
impairment learning
digital impairment
impairments
Prior art date
Application number
PCT/US2000/017195
Other languages
French (fr)
Other versions
WO2000079723A1 (en
Inventor
Gomatam Krishnan Vedavalli
Jeffrey Allan Green
Jiang Xuefeng
Original Assignee
Cirrus Logic Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cirrus Logic Inc filed Critical Cirrus Logic Inc
Priority to AU58837/00A priority Critical patent/AU5883700A/en
Publication of WO2000079723A1 publication Critical patent/WO2000079723A1/en
Publication of WO2000079723A8 publication Critical patent/WO2000079723A8/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
    • H04L25/4927—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using levels matched to the quantisation levels of the channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1438—Negotiation of transmission parameters prior to communication
    • H04L5/1453—Negotiation of transmission parameters prior to communication of modulation type

Abstract

A Digital Impairment Learning Sequence which is designed for providing reliable estimate of digital impairments such as PAD, RBS, and CODEC type in the present of analog impairments such as IMD, noise and changing line conditions. This estimate is used to derive optimum transmit symbol constellations for a modem (10) connected digitally to a trunk (40) so as to maximize its data transmission rate.
PCT/US2000/017195 1999-06-24 2000-06-23 Digital impairment learning sequence WO2000079723A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58837/00A AU5883700A (en) 1999-06-24 2000-06-23 Digital impairment learning sequence

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US14070599P 1999-06-24 1999-06-24
US60/140,705 1999-06-24
US14082599P 1999-06-28 1999-06-28
US60/140,825 1999-06-28
US09/592,539 2000-06-12
US09/592,539 US6301296B1 (en) 1999-06-24 2000-06-12 Digital impairment learning sequence

Publications (2)

Publication Number Publication Date
WO2000079723A1 WO2000079723A1 (en) 2000-12-28
WO2000079723A8 true WO2000079723A8 (en) 2001-12-27

Family

ID=27385540

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/017195 WO2000079723A1 (en) 1999-06-24 2000-06-23 Digital impairment learning sequence

Country Status (2)

Country Link
US (1) US6301296B1 (en)
WO (1) WO2000079723A1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6567463B1 (en) * 1998-05-29 2003-05-20 3Com Corporation Method and system for detecting analog and ADPCM links in a communication channel
US6504865B1 (en) * 1999-02-24 2003-01-07 Altocom, Inc. Digital connection detection technique
US6523233B1 (en) * 1999-04-22 2003-02-25 Agere Systems, Inc. Method and apparatus for telephone network impairment detection and compensation in signal transmission between modems
US7339996B2 (en) * 1999-06-24 2008-03-04 Intel Corporation Receiver codec super set constellation generator
US6724814B1 (en) * 1999-06-24 2004-04-20 Intel Corporation Pad and CODEC detection
EP1206865B1 (en) * 1999-07-31 2011-03-23 AltoCom, Inc. Impairment compensation sequence and related techniques for data communication
US7203248B1 (en) * 1999-07-31 2007-04-10 Broadcom Corporation Impairment sensitive selection of constellation points for communication across a channel
US7190727B1 (en) 1999-07-31 2007-03-13 Broadcom Corporation Categorization of impairments affecting a communication channel
US6754258B1 (en) * 1999-10-29 2004-06-22 International Business Machines Corporation Systems, methods and computer program products for averaging learned levels in the presence of digital impairments based on patterns
US6901107B1 (en) * 1999-10-29 2005-05-31 International Business Machines Corporation Systems, methods, and computer program products for generating a digital impairment learning signal having low energy content at direct current and Nyquist frequencies
US6839382B1 (en) * 1999-10-29 2005-01-04 International Business Machines Corporation System, methods and computer program products for identifying digital impairments in modem signals using signature analysis and signal level comparison analysis
US6816545B1 (en) * 1999-10-29 2004-11-09 International Business Machines Corporation Systems, methods and computer program products for identifying digital impairments in modems based on clusters and/or skips in pulse code modulation signal levels
US6785326B1 (en) * 2000-08-07 2004-08-31 Freescale Semiconductor, Inc. Method and apparatus for detecting and compensating digital losses in a communications network
US6560277B2 (en) 2001-02-09 2003-05-06 Pc Tel, Inc. Distinguishing between final coding of received signals in a PCM modem
US20050188311A1 (en) * 2003-12-31 2005-08-25 Automatic E-Learning, Llc System and method for implementing an electronic presentation
US10003488B2 (en) * 2015-03-06 2018-06-19 Mediatek Inc. Method and electronic apparatus for automatically detecting bandwidth and packet type of packet

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0587620B1 (en) 1991-06-03 1998-01-07 BRITISH TELECOMMUNICATIONS public limited company Radio system
US5684834A (en) 1993-06-14 1997-11-04 Paradyne Corporation Simultaneous analog and digital communication using fractional rate encoding
US5844940A (en) 1995-06-30 1998-12-01 Motorola, Inc. Method and apparatus for determining transmit power levels for data transmission and reception
US5751741A (en) 1996-11-20 1998-05-12 Motorola, Inc. Rate-adapted communication system and method for efficient buffer utilization thereof
US5862179A (en) 1997-02-14 1999-01-19 General Datacomm, Inc. Mapper for high data rate signalling
US5822371A (en) 1997-02-14 1998-10-13 General Datacomm Inc. Mapper for high data rate signalling
US5825816A (en) 1997-02-14 1998-10-20 General Datacomm, Inc. Spectral and power shaping mapper for high data rate signalling
US5838724A (en) 1997-02-14 1998-11-17 General Datacomm, Inc. Spectral and power shaping mapper for high data rate signalling
US5862184A (en) 1997-02-14 1999-01-19 General Datacomm, Inc. Mapper for high data rate transmission through channels subject to robbed bit signalling
US5802111A (en) 1997-02-24 1998-09-01 Motorola, Inc. Complex constellation point multiplier
US6088334A (en) * 1997-03-13 2000-07-11 U. S. Robotics Access Corp. System and method for determining end-to-end characteristics of a data communication channel
US5838268A (en) 1997-03-14 1998-11-17 Orckit Communications Ltd. Apparatus and methods for modulation and demodulation of data
US5831561A (en) 1997-04-29 1998-11-03 Lucent Technologies Inc. System and method for dynamically optimizing a symbol table and modem employing the same
US6023493A (en) * 1998-01-20 2000-02-08 Conexant Systems, Inc. Method and apparatus for synchronizing a data communication system to a periodic digital impairment
US6065030A (en) * 1998-03-30 2000-05-16 Conexant Systems, Inc. Method and apparatus for implementing short-word division techniques in a multiple modulus conversion context

Also Published As

Publication number Publication date
WO2000079723A1 (en) 2000-12-28
US6301296B1 (en) 2001-10-09

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