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WO1999000926A3 - A digital system for subscriber lines allowing high bit rates - Google Patents

A digital system for subscriber lines allowing high bit rates Download PDF

Info

Publication number
WO1999000926A3
WO1999000926A3 PCT/SE1998/001283 SE9801283W WO9900926A3 WO 1999000926 A3 WO1999000926 A3 WO 1999000926A3 SE 9801283 W SE9801283 W SE 9801283W WO 9900926 A3 WO9900926 A3 WO 9900926A3
Authority
WO
WIPO (PCT)
Prior art keywords
carriers
subscriber
transforming
units
cable
Prior art date
Application number
PCT/SE1998/001283
Other languages
French (fr)
Other versions
WO1999000926A2 (en
Inventor
Tore Andre
Antoni Fertner
Anders Oerling
Mattias Hyll
Original Assignee
Ericsson Telefon Ab L M
Tore Andre
Antoni Fertner
Anders Oerling
Mattias Hyll
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 Ericsson Telefon Ab L M, Tore Andre, Antoni Fertner, Anders Oerling, Mattias Hyll filed Critical Ericsson Telefon Ab L M
Priority to EP98931186A priority Critical patent/EP0988732A2/en
Priority to AU81368/98A priority patent/AU742816B2/en
Priority to CA002294766A priority patent/CA2294766A1/en
Publication of WO1999000926A2 publication Critical patent/WO1999000926A2/en
Publication of WO1999000926A3 publication Critical patent/WO1999000926A3/en

Links

Classifications

    • 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
    • H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
    • 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
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals, e.g. multi-user orthogonal frequency division multiple access [OFDMA]

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

A subscriber line connection for very high bit rates in a telecommunication network comprises a line unit (5) connected to a transport network (1) and through a twisted two-wire cable (7) to a subscriber unit (9). Information is communicated bidirectionally on the cable using frequency multiplexing on orthogonal carriers. The line and subscriber units each comprise modulating units (19, 37) determining an inverse discrete fourier transform on incoming symbols and demodulating units (29, 43) for making a direct discrete fourier transform on a sampled stream of the signal forwarded on the cable (7). The transforming units (19, 29) used for transmission in one direction use carriers which are different from those used by the transforming units (37, 43) in the opposite direction. The carriers are selected so that in at least one of the directions special properties of the transforms are used for reducing the number of calculations which are required. In the direction from the subscriber (3) only carriers having even indices can be used in the transforming unit (37) and then the output signal sent on the cable (7) will consist of a repeated sequence having half the length of that obtained when all carriers are used, so that only a sequence having half the length has to be calculated and repeated. In the transforming unit (43) receiving such a twice repeated signal, the received symbols can be subdivided into two equal segments which are added to each other and then a reduced transforming operation is executed. In the opposite direction the transforming operation using all carriers can always be calculated. Then also, the lowest frequencies can be always assigned to this direction towards the subscriber, since the transmission in the opposite direction may be especially sensitive to noise or interference at low frequencies which thus should not be used.
PCT/SE1998/001283 1997-06-30 1998-06-30 A digital system for subscriber lines allowing high bit rates WO1999000926A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP98931186A EP0988732A2 (en) 1997-06-30 1998-06-30 A digital system for subscriber lines allowing high bit rates
AU81368/98A AU742816B2 (en) 1997-06-30 1998-06-30 A digital system for subscriber lines allowing high bit rates
CA002294766A CA2294766A1 (en) 1997-06-30 1998-06-30 A digital system for subscriber lines allowing high bit rates

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9702550A SE514736C2 (en) 1997-06-30 1997-06-30 Digital system for high bit rate subscriber lines
SE9702550-6 1997-06-30

Publications (2)

Publication Number Publication Date
WO1999000926A2 WO1999000926A2 (en) 1999-01-07
WO1999000926A3 true WO1999000926A3 (en) 1999-03-18

Family

ID=20407609

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/001283 WO1999000926A2 (en) 1997-06-30 1998-06-30 A digital system for subscriber lines allowing high bit rates

Country Status (5)

Country Link
EP (1) EP0988732A2 (en)
AU (1) AU742816B2 (en)
CA (1) CA2294766A1 (en)
SE (1) SE514736C2 (en)
WO (1) WO1999000926A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6879640B1 (en) 1999-10-20 2005-04-12 Broadcom Corporation Method, apparatus and system for high-speed transmission on fiber optic channel
ATE441274T1 (en) * 1999-10-20 2009-09-15 Broadcom Corp DEVICE FOR HIGH-SPEED TRANSMISSION VIA OPTICAL FIBER CHANNEL

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0616445A1 (en) * 1993-03-17 1994-09-21 France Telecom Duplex multicarrier digital radio communication system, mobile station and base station for it
EP0668678A2 (en) * 1994-02-22 1995-08-23 ITALTEL SOCIETA ITALIANA TELECOMUNICAZIONI s.p.a. Orthogonal frequency division multiplexing (OFDM) system and method for data sequence transmission
WO1997006619A1 (en) * 1995-08-04 1997-02-20 Telia Ab Procedure to suppress near-end crosstalk at bidirectional communication in wire network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0616445A1 (en) * 1993-03-17 1994-09-21 France Telecom Duplex multicarrier digital radio communication system, mobile station and base station for it
EP0668678A2 (en) * 1994-02-22 1995-08-23 ITALTEL SOCIETA ITALIANA TELECOMUNICAZIONI s.p.a. Orthogonal frequency division multiplexing (OFDM) system and method for data sequence transmission
WO1997006619A1 (en) * 1995-08-04 1997-02-20 Telia Ab Procedure to suppress near-end crosstalk at bidirectional communication in wire network

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON COMMUNICATIONS, Volume 33, No. 7, July 1985, LEONARD J. CIMINI, Jr., "Analysis and Simulation of a Digital Mobile Channel using Orthogonal Frequency Division Multiplexing". *
IEEE TRANSACTIONS ON COMMUNICATIONS, Volume 40, No. 6, June 1992, ANTONIO RUIZ et al., "Discrete Multiple Tone Modulation with Coset Coding for the Spectrally Shaped Channel", pages 1012-1015. *

Also Published As

Publication number Publication date
EP0988732A2 (en) 2000-03-29
SE9702550D0 (en) 1997-06-30
SE514736C2 (en) 2001-04-09
SE9702550L (en) 1998-12-31
WO1999000926A2 (en) 1999-01-07
CA2294766A1 (en) 1999-01-07
AU742816B2 (en) 2002-01-10
AU8136898A (en) 1999-01-19

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