WO1999037051A3 - Method and apparatus for synchronizing a data communication system to a periodic digital impairment - Google Patents

Method and apparatus for synchronizing a data communication system to a periodic digital impairment Download PDF

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Publication number
WO1999037051A3
WO1999037051A3 PCT/US1999/001005 US9901005W WO9937051A3 WO 1999037051 A3 WO1999037051 A3 WO 1999037051A3 US 9901005 W US9901005 W US 9901005W WO 9937051 A3 WO9937051 A3 WO 9937051A3
Authority
WO
WIPO (PCT)
Prior art keywords
modem
symbol
rbs
symbols
modulo
Prior art date
Application number
PCT/US1999/001005
Other languages
French (fr)
Other versions
WO1999037051A2 (en
Inventor
Sverrir Olafsson
Original Assignee
Conexant Systems 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 Conexant Systems Inc filed Critical Conexant Systems Inc
Priority to EP99902328A priority Critical patent/EP1050127B1/en
Priority to DE69919982T priority patent/DE69919982T2/en
Publication of WO1999037051A2 publication Critical patent/WO1999037051A2/en
Publication of WO1999037051A3 publication Critical patent/WO1999037051A3/en
Priority to HK01103247A priority patent/HK1033870A1/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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/12—Arrangements providing for calling or supervisory signals
    • H04J3/125—One of the channel pulses or the synchronisation pulse is also used for transmitting monitoring or supervisory signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/345—Modifications of the signal space to allow the transmission of additional information
    • H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
    • H04L27/3472—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel by switching between alternative constellations

Abstract

A pulse code modulation modem system is configured to transmit data from a first modem to a second modem over the public switched telephone network (PSTN). The PSTN employs robbed bit signaling (RBS) such that symbols affected by RBS arrive at the second modem in a periodic manner based on a period of six symbols. The modem system is configured such that signal segments are formatted and transmitted with six symbols per segment. After obtaining symbol synchronization, the second modem initializes a modulo-6 symbol counter such that the zero count corresponds to the first symbol of each received signal segment. Those symbols affected by RBS are identified and analyzed to determine optimized signal point constellations that may be used to compensate for the RBS on a symbol-by-symbol basis during subsequent encoding and decoding. Upon a loss of synchronization, the second modem resets its modulo-6 counter in response to the detection of the first symbol in a subsequent signal segment. In this manner, the modem system can again use the optimized signal point constellations determined previously.
PCT/US1999/001005 1998-01-20 1999-01-19 Method and apparatus for synchronizing a data communication system to a periodic digital impairment WO1999037051A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP99902328A EP1050127B1 (en) 1998-01-20 1999-01-19 Method and apparatus for synchronizing a data communication system to a periodic digital impairment
DE69919982T DE69919982T2 (en) 1998-01-20 1999-01-19 METHOD AND DEVICES FOR SYNCHRONIZING A DATA COMMUNICATION TECHNOLOGY SYSTEM WITH PERIODIC DIGITAL IMPAIRMENT
HK01103247A HK1033870A1 (en) 1998-01-20 2001-05-08 Method and apparatus for sychronizing a data communication system to a periodic digital impairment.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/009,228 1998-01-20
US09/009,228 US6023493A (en) 1998-01-20 1998-01-20 Method and apparatus for synchronizing a data communication system to a periodic digital impairment

Publications (2)

Publication Number Publication Date
WO1999037051A2 WO1999037051A2 (en) 1999-07-22
WO1999037051A3 true WO1999037051A3 (en) 2000-08-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/001005 WO1999037051A2 (en) 1998-01-20 1999-01-19 Method and apparatus for synchronizing a data communication system to a periodic digital impairment

Country Status (5)

Country Link
US (3) US6023493A (en)
EP (1) EP1050127B1 (en)
DE (1) DE69919982T2 (en)
HK (1) HK1033870A1 (en)
WO (1) WO1999037051A2 (en)

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DATABASE WPI Section EI Week 9828, Derwent World Patents Index; Class W01, AN 98-169482, XP002105165 *

Also Published As

Publication number Publication date
US6081567A (en) 2000-06-27
US6023493A (en) 2000-02-08
USRE38678E1 (en) 2004-12-28
EP1050127A2 (en) 2000-11-08
WO1999037051A2 (en) 1999-07-22
EP1050127B1 (en) 2004-09-08
HK1033870A1 (en) 2001-09-28
DE69919982T2 (en) 2005-09-29
DE69919982D1 (en) 2004-10-14

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