SE9704497L - Improvements to, or relating to, data scramblers - Google Patents

Improvements to, or relating 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
present invention
synchronisation
known
user data
Prior art date
Application number
SE9704497A
Other languages
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
Publication of SE9704497L publication Critical patent/SE9704497L/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; Arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks ; Receiver end arrangements for processing baseband signals
    • H04L25/03828Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03866Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2626Arrangements specific to the transmitter
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver

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 relating to, data scramblers SE9704497L (en)

Priority Applications (1)

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

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9704497A SE9704497L (en) 1997-12-03 1997-12-03 Improvements to, or relating to, data scramblers
PCT/SE1998/002193 WO1999029078A2 (en) 1997-12-03 1998-12-01 Improvements in, or relating 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 relating 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
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
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
US6952480B1 (en) 1999-09-20 2005-10-04 Applied Micro Circuits Corporation Self-synchronous data scrambler
AU1596401A (en) * 1999-11-09 2001-06-06 Aware, Inc. A system and method for scrambling the phase of the carriers in a multicarrier communications system
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
DE19958210C2 (en) 1999-12-02 2003-08-21 Fraunhofer Ges Forschung Apparatus and method for generating a transmit sequence, and apparatus and method for determining an information word from a received transmit 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 establishing 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 regenerator
SE9302453L (en) * 1993-07-20 1994-10-17 Telia Ab Method and apparatus for synchronization in digital transmission systems of the OFDM type
SE502656C2 (en) * 1994-11-29 1995-12-04 Telia Ab Method for synchronization of transmitter and receiver at mobile radio system
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 apparatus for initial synchronization in a communication system

Also Published As

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

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