SE9702550D0 - A digital system for subscriber lines allowing high bit rates - Google Patents

A digital system for subscriber lines allowing high bit rates

Info

Publication number
SE9702550D0
SE9702550D0 SE9702550A SE9702550A SE9702550D0 SE 9702550 D0 SE9702550 D0 SE 9702550D0 SE 9702550 A SE9702550 A SE 9702550A SE 9702550 A SE9702550 A SE 9702550A SE 9702550 D0 SE9702550 D0 SE 9702550D0
Authority
SE
Sweden
Prior art keywords
carriers
subscriber
transforming
units
cable
Prior art date
Application number
SE9702550A
Other languages
Swedish (sv)
Other versions
SE9702550L (en
SE514736C2 (en
Inventor
Tore Andre
Antoni Fertner
Anders Oerling
Mattias Hyll
Original Assignee
Ericsson Telefon Ab L M
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 filed Critical Ericsson Telefon Ab L M
Priority to SE9702550A priority Critical patent/SE514736C2/en
Publication of SE9702550D0 publication Critical patent/SE9702550D0/en
Priority to CA002294766A priority patent/CA2294766A1/en
Priority to AU81368/98A priority patent/AU742816B2/en
Priority to PCT/SE1998/001283 priority patent/WO1999000926A2/en
Priority to EP98931186A priority patent/EP0988732A2/en
Publication of SE9702550L publication Critical patent/SE9702550L/en
Publication of SE514736C2 publication Critical patent/SE514736C2/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

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.
SE9702550A 1997-06-30 1997-06-30 Digital system for high bit rate subscriber lines SE514736C2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
SE9702550A SE514736C2 (en) 1997-06-30 1997-06-30 Digital system for high bit rate subscriber lines
CA002294766A CA2294766A1 (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
PCT/SE1998/001283 WO1999000926A2 (en) 1997-06-30 1998-06-30 A digital system for subscriber lines allowing high bit rates
EP98931186A EP0988732A2 (en) 1997-06-30 1998-06-30 A digital system for subscriber lines allowing high bit rates

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
SE9702550D0 true SE9702550D0 (en) 1997-06-30
SE9702550L SE9702550L (en) 1998-12-31
SE514736C2 SE514736C2 (en) 2001-04-09

Family

ID=20407609

Family Applications (1)

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

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
AU1222701A (en) * 1999-10-20 2001-04-30 Broadcom Corporation Method, apparatus and system for high-speed transmission on fiber optic channel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2702904B1 (en) * 1993-03-17 1995-06-30 France Telecom MULTI-CARRIER TWO-WAY DIGITAL RADIO COMMUNICATION SYSTEM, CORRESPONDING MOBILE STATION AND BASE STATION.
IT1273794B (en) * 1994-02-22 1997-07-10 Italtel Spa FREQUENCY DIVISION ORTHOGONAL MULTIPLATION SYSTEM (OFDM) FOR THE TRANSMISSION OF DATA SEQUENCES
SE9502775L (en) * 1995-08-04 1997-02-05 Telia Ab Procedure for suppressing near-interrogation in bidirectional communication in wireline networks

Also Published As

Publication number Publication date
WO1999000926A2 (en) 1999-01-07
CA2294766A1 (en) 1999-01-07
SE9702550L (en) 1998-12-31
AU8136898A (en) 1999-01-19
AU742816B2 (en) 2002-01-10
SE514736C2 (en) 2001-04-09
EP0988732A2 (en) 2000-03-29
WO1999000926A3 (en) 1999-03-18

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Legal Events

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