HK49096A - Method and apparatus for wideband transmission of digital signals between a telephone central office and customer premises - Google Patents

Method and apparatus for wideband transmission of digital signals between a telephone central office and customer premises

Info

Publication number
HK49096A
HK49096A HK49096A HK49096A HK49096A HK 49096 A HK49096 A HK 49096A HK 49096 A HK49096 A HK 49096A HK 49096 A HK49096 A HK 49096A HK 49096 A HK49096 A HK 49096A
Authority
HK
Hong Kong
Prior art keywords
digital signals
central office
customer premises
telephone central
wideband transmission
Prior art date
Application number
HK49096A
Other languages
English (en)
Inventor
Richard Dennis Gitlin
Sailesh Krishna Rao
Jean-Jacques Werner
Nicholas Zervos
Original Assignee
At & T Corp
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22624555&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=HK49096(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by At & T Corp filed Critical At & T Corp
Publication of HK49096A publication Critical patent/HK49096A/xx

Links

Classifications

    • 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
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H04L27/3416—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes
    • H04L27/3427—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes in which the constellation is the n - fold Cartesian product of a single underlying two-dimensional constellation
    • H04L27/3438—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes in which the constellation is the n - fold Cartesian product of a single underlying two-dimensional constellation using an underlying generalised cross constellation
    • 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
    • H04L25/4919—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 balanced multilevel codes
    • H04L25/4921—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 balanced multilevel codes using quadrature encoding, e.g. carrierless amplitude-phase coding

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Interface Circuits In Exchanges (AREA)
HK49096A 1988-03-22 1996-03-21 Method and apparatus for wideband transmission of digital signals between a telephone central office and customer premises HK49096A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/171,636 US4924492A (en) 1988-03-22 1988-03-22 Method and apparatus for wideband transmission of digital signals between, for example, a telephone central office and customer premises

Publications (1)

Publication Number Publication Date
HK49096A true HK49096A (en) 1996-03-29

Family

ID=22624555

Family Applications (1)

Application Number Title Priority Date Filing Date
HK49096A HK49096A (en) 1988-03-22 1996-03-21 Method and apparatus for wideband transmission of digital signals between a telephone central office and customer premises

Country Status (8)

Country Link
US (1) US4924492A (xx)
EP (1) EP0334549B2 (xx)
JP (1) JP2547844B2 (xx)
CA (1) CA1304848C (xx)
DE (1) DE68919250T3 (xx)
ES (1) ES2063123T5 (xx)
HK (1) HK49096A (xx)
SG (1) SG30538G (xx)

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Also Published As

Publication number Publication date
ES2063123T3 (es) 1995-01-01
JPH0211057A (ja) 1990-01-16
JP2547844B2 (ja) 1996-10-23
SG30538G (en) 1995-08-18
CA1304848C (en) 1992-07-07
DE68919250D1 (de) 1994-12-15
EP0334549B1 (en) 1994-11-09
EP0334549B2 (en) 2006-12-06
DE68919250T2 (de) 1995-06-08
DE68919250T3 (de) 2007-06-21
EP0334549A2 (en) 1989-09-27
EP0334549A3 (en) 1990-05-23
ES2063123T5 (es) 2007-08-01
US4924492A (en) 1990-05-08

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Effective date: 20090315