SE9704497L - Improvements to, or with respect to, data scramblers - Google Patents

Improvements to, or with respect to, data scramblers

Info

Publication number
SE9704497L
SE9704497L SE9704497A SE9704497A SE9704497L SE 9704497 L SE9704497 L SE 9704497L SE 9704497 A SE9704497 A SE 9704497A SE 9704497 A SE9704497 A SE 9704497A SE 9704497 L SE9704497 L SE 9704497L
Authority
SE
Sweden
Prior art keywords
data
synchronisation
present
user data
pseudo
Prior art date
Application number
SE9704497A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9704497D0 (en
Inventor
Lennart Olsson
Kjell-Gunnar Bahlenberg
Daniel Bengtsson
Siwert Haakanssoon
Anders Isaksson
Mikael Isaksson
Magnus Johansson
Karin Lis-Mari Ljunggren
Hans Lundberg
Tomas Nordstroem
Sven-Rune Olofsson
Tomas Stefansson
Hans Oehman
Sven Goeran Oekvist
Original Assignee
Telia Ab
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 Telia Ab filed Critical Telia Ab
Priority to SE9704497A priority Critical patent/SE9704497L/en
Publication of SE9704497D0 publication Critical patent/SE9704497D0/en
Priority to PCT/SE1998/002193 priority patent/WO1999029078A2/en
Publication of SE9704497L publication Critical patent/SE9704497L/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03866—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only

Abstract

The present invention simplifies known data scramblers by making use of the synchronisation frames, normally used for measuring channel characteristics, as a source of pseudo-random data which can be combined with incoming user data. The present invention has particular application to multi-carrier transmission systems which employ DMT, or OFDM. Many of these transmission systems send known data, usually referred to as synchronisation frames, to measure channel characteristics such as signal to noise ratio. The known data contained in a synchronisation frame is selected to have a suitable statistical distribution, e.g. pseudo-random. In the data scrambler of the present invention, user data bits are combined with the known synchronisation frame data using an exclusive-OR function. This results in a statistically and computationally efficient scrambling of the user data.
SE9704497A 1997-12-03 1997-12-03 Improvements to, or with respect to, data scramblers SE9704497L (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE9704497A SE9704497L (en) 1997-12-03 1997-12-03 Improvements to, or with respect to, data scramblers
PCT/SE1998/002193 WO1999029078A2 (en) 1997-12-03 1998-12-01 Improvements in, or relating to, data scramblers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9704497A SE9704497L (en) 1997-12-03 1997-12-03 Improvements to, or with respect to, data scramblers

Publications (2)

Publication Number Publication Date
SE9704497D0 SE9704497D0 (en) 1997-12-03
SE9704497L true SE9704497L (en) 1999-06-04

Family

ID=20409240

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9704497A SE9704497L (en) 1997-12-03 1997-12-03 Improvements to, or with respect to, data scramblers

Country Status (2)

Country Link
SE (1) SE9704497L (en)
WO (1) WO1999029078A2 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000079747A1 (en) * 1999-06-23 2000-12-28 At & T Wireless Services, Inc. System and method for data scrambling to reduce the crest factor in an ofdm waveform
US6785258B1 (en) 1999-06-23 2004-08-31 At&T Wireless Services, Inc. System and method for data scrambling to reduce the crest factor in an OFDM waveform
US6952480B1 (en) 1999-09-20 2005-10-04 Applied Micro Circuits Corporation Self-synchronous data scrambler
US6961369B1 (en) 1999-11-09 2005-11-01 Aware, Inc. System and method for scrambling the phase of the carriers in a multicarrier communications system
CA2387812A1 (en) * 1999-11-09 2001-05-17 Marcos C. Tzannes Par reduction by carriers phase randomization in multicarrier communications
DE19958210C2 (en) 1999-12-02 2003-08-21 Fraunhofer Ges Forschung Device and method for generating a transmission sequence and device and method for determining an information word from a received transmission sequence
JP3860762B2 (en) 2002-02-14 2006-12-20 株式会社エヌ・ティ・ティ・ドコモ Mobile communication system, channel synchronization establishment method, and mobile station
CN100440875C (en) * 2004-05-13 2008-12-03 中兴通讯股份有限公司 A baseband data transmission apparatus and frame synchronization method thereof
US8000404B2 (en) 2006-03-28 2011-08-16 Advanced Micro Devices, Inc. Method and apparatus to reduce the effect of crosstalk in a communications interface
WO2007126821A2 (en) * 2006-04-24 2007-11-08 Advanced Micro Devices, Inc. Method and apparatus to reduce the effect of crosstalk in a communications interface
CN101610122B (en) * 2009-07-03 2013-03-20 中兴通讯股份有限公司 Parallel frame synchronous scrambling device and descrambling device thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4387460A (en) * 1979-07-23 1983-06-07 Societe Anonyme De Tele-Communication Supplementary information transmitting arrangement for a digital data transmission system
US4646305A (en) * 1983-09-26 1987-02-24 Case Communications, Inc. High speed data modem using multilevel encoding
JP2513331B2 (en) * 1989-11-10 1996-07-03 日本電気株式会社 Carrier wave regenerator
SE500986C2 (en) * 1993-07-20 1994-10-17 Telia Ab Method and apparatus for synchronization in digital transmission system of type OFDM
SE502656C2 (en) * 1994-11-29 1995-12-04 Telia Ab Method for synchronizing transmitters and receivers with mobile radio systems
US5862160A (en) * 1996-12-31 1999-01-19 Ericsson, Inc. Secondary channel for communication networks
SE517930C2 (en) * 1997-01-31 2002-08-06 Ericsson Telefon Ab L M Method and device for initial synchronization in a communication system

Also Published As

Publication number Publication date
WO1999029078A3 (en) 1999-08-12
WO1999029078A2 (en) 1999-06-10
SE9704497D0 (en) 1997-12-03

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