SE9402464D0 - Method and apparatus for synchronizing transmitters and receivers in digital system - Google Patents

Method and apparatus for synchronizing transmitters and receivers in digital system

Info

Publication number
SE9402464D0
SE9402464D0 SE9402464A SE9402464A SE9402464D0 SE 9402464 D0 SE9402464 D0 SE 9402464D0 SE 9402464 A SE9402464 A SE 9402464A SE 9402464 A SE9402464 A SE 9402464A SE 9402464 D0 SE9402464 D0 SE 9402464D0
Authority
SE
Sweden
Prior art keywords
chirp
signal
frames
synchronisation
frequency
Prior art date
Application number
SE9402464A
Other languages
Swedish (sv)
Other versions
SE514809C2 (en
SE9402464L (en
Inventor
Staffan Nystroem
Erik Stare
Maarten Rignell
Goeran Roth
Brian Loennroth
Vidar Ringset
Original Assignee
Hd Divine
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 Hd Divine filed Critical Hd Divine
Priority to SE9402464A priority Critical patent/SE514809C2/en
Publication of SE9402464D0 publication Critical patent/SE9402464D0/en
Priority to JP8504933A priority patent/JPH10505471A/en
Priority to KR1019970700122A priority patent/KR970705262A/en
Priority to AU29944/95A priority patent/AU2994495A/en
Priority to CN95194104A priority patent/CN1152982A/en
Priority to PCT/SE1995/000771 priority patent/WO1996002990A2/en
Publication of SE9402464L publication Critical patent/SE9402464L/en
Publication of SE514809C2 publication Critical patent/SE514809C2/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
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
    • 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
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • 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
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H04L25/062—Setting decision thresholds using feedforward techniques 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
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • 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
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H04L27/2671—Time domain
    • 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
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols

Abstract

In an OFDM system, pre-FFT synchronisation is performed on the received signal before conversion from the time domain to the frequency domain, i.e. before the signal is subject to FFT processing. Data is transmitted in frames. A plurality of frames may be transmitted as a super-frame. Each super-frame commences with at least one synchronisation frame and is followed by a defined number of information carrying frames. One, or more, synchronisation frames contains a chirp signal. A chirp signal is a sine wave signal having a frequency which changes linearly with time. Two adjacent synchronisation frames may each contain a chirp signal. The chirp signals in adjacent frames have their frequencies changing in opposite senses, i.e. one chirp signal has a frequency which increases with time, the up-chirp, while the other chirp signal has a frequency which decreases with time, the down-chirp. A bit pattern is stored in the receiver which corresponds to the decoded chirp signal, i.e. the chirp signal after it has been digitally processed by the receiver. The received signal is compared, after digital processing, with the stored bit pattern.
SE9402464A 1994-07-13 1994-07-13 Method and apparatus for synchronizing transmitters and receivers in digital system SE514809C2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE9402464A SE514809C2 (en) 1994-07-13 1994-07-13 Method and apparatus for synchronizing transmitters and receivers in digital system
JP8504933A JPH10505471A (en) 1994-07-13 1995-06-22 Method and apparatus for synchronizing transmitter and receiver in digital system
KR1019970700122A KR970705262A (en) 1994-07-13 1995-06-22 METHOD AND DEVICE FOR SYNCHRONIZATION OF TRANSMITTER AND RECEIVER IN A DIGITAL SYSTEM -
AU29944/95A AU2994495A (en) 1994-07-13 1995-06-22 Method and device for synchronization of transmitter and receiver in a digital system
CN95194104A CN1152982A (en) 1994-07-13 1995-06-22 Method and device for synchronization of transmitter and receiver in a digital system
PCT/SE1995/000771 WO1996002990A2 (en) 1994-07-13 1995-06-22 Method and device for synchronization of transmitter and receiver in a digital system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9402464A SE514809C2 (en) 1994-07-13 1994-07-13 Method and apparatus for synchronizing transmitters and receivers in digital system

Publications (3)

Publication Number Publication Date
SE9402464D0 true SE9402464D0 (en) 1994-07-13
SE9402464L SE9402464L (en) 1996-01-14
SE514809C2 SE514809C2 (en) 2001-04-30

Family

ID=20394713

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9402464A SE514809C2 (en) 1994-07-13 1994-07-13 Method and apparatus for synchronizing transmitters and receivers in digital system

Country Status (6)

Country Link
JP (1) JPH10505471A (en)
KR (1) KR970705262A (en)
CN (1) CN1152982A (en)
AU (1) AU2994495A (en)
SE (1) SE514809C2 (en)
WO (1) WO1996002990A2 (en)

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SE514986C2 (en) * 1995-03-01 2001-05-28 Telia Ab Method and device for synchronization with OFDM systems
US6151374A (en) * 1996-03-04 2000-11-21 Mitsubishi Denki Kabushiki Kaisha Synchronizing signal detecting apparatus
EP0822682A1 (en) * 1996-07-05 1998-02-04 Deutsche Thomson-Brandt Gmbh Method for the frequency correction of multicarrier signals and related apparatus
US6865232B1 (en) * 1996-09-02 2005-03-08 Stmicroelectronics N.V. Multi-carrier transmission systems
KR100221336B1 (en) * 1996-12-28 1999-09-15 전주범 Frame harmonic apparatus and method of multi-receiver system
JPH10209998A (en) * 1997-01-20 1998-08-07 Sony Corp Demodulation device
KR100248652B1 (en) * 1997-03-31 2000-03-15 전주범 A circuit for transforming of phase signal in ofdm receiving system
DE19718492A1 (en) * 1997-05-02 1998-11-05 Bosch Gmbh Robert Method for the transmission of data using a multi-carrier transmission method
GB9709063D0 (en) * 1997-05-02 1997-06-25 British Broadcasting Corp Improvements to OFDM symbol synchronization
FR2765058B1 (en) * 1997-06-24 2000-09-01 Thomson Csf METHOD AND DEVICE FOR FREQUENTIAL CORRECTION IN VARIABLE CARRIER FREQUENCY MODULATION AND SEVERAL SUB-CARRIERS
GB2332603B (en) * 1997-12-22 2000-07-19 Lsi Logic Corp Improvements relating to multidirectional communication systems
US6396866B1 (en) * 1998-05-01 2002-05-28 Trw Inc. Symmetric chirp communications acquisition method and apparatus
US6304619B1 (en) * 1998-07-01 2001-10-16 Zenith Electronics Corporation Receiver synchronizer
JP2000115263A (en) * 1998-09-30 2000-04-21 Matsushita Electric Ind Co Ltd Digital broadcast demodulator
US7245930B1 (en) * 1998-11-24 2007-07-17 Hughes Network Systems, Llc Acquisition mechanism for a mobile satellite system
WO2000031899A1 (en) * 1998-11-24 2000-06-02 Hughes Electronics Corporation Synchronization in mobile satellite systems using dual-chirp waveform
EP1011234A1 (en) * 1998-12-18 2000-06-21 Sony International (Europe) GmbH Synchronisation of a RF receiver using chirp signals with a passive correlator
DE19914600A1 (en) 1999-03-30 2000-10-05 Bosch Gmbh Robert Synchronization method for orthogonal frequency division multiplexing (OFDM) radio receivers by inserting symbol sequence in data stream
EP1073241A3 (en) * 1999-07-29 2006-05-03 Matsushita Electric Industrial Co., Ltd. Symbol synchronisation in multicarrier transmission
US6628697B1 (en) * 1999-10-21 2003-09-30 Cisco Technology, Inc. Subscriber unit ranging in a point to multipoint system
US7177343B1 (en) * 2000-05-17 2007-02-13 Zenith Electronics Corporation Compound chirp and synchronizer for using same
EP1542418A1 (en) * 2003-12-10 2005-06-15 Telefonaktiebolaget LM Ericsson (publ) Wireless multicarrier system with subcarriers reserved for communication between unsynchronized nodes
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
US7756005B2 (en) * 2005-03-11 2010-07-13 Qualcomm Incorporated Coarse timing/frame acquisition of OFDM system using time division multiplexed pilot symbol
CN101166186A (en) * 2006-10-20 2008-04-23 鲍东山 Construction method for physical layer frame of OFDM WLAN and its response method
US20080273643A1 (en) * 2007-05-04 2008-11-06 Legend Silicon Corp. Apparatus and method of exact time framing in a dmb-th transmitter
CN101146072B (en) * 2007-10-26 2010-09-22 上海大学 Ultra-narrow bandwidth communication method with highly-low linear frequency modulation key control modulation
CN101267424B (en) * 2008-02-26 2011-08-31 上海大学 Ultra-broadband wireless communication modulation method based on scanning frequency pulse
CN101841499B (en) * 2009-03-18 2012-10-31 扬智科技股份有限公司 Transmission parameter signaling module and transmission parameter signaling decoding method
CN101635699B (en) * 2009-08-24 2012-12-26 清华大学 Sending and transmitting method of OFDM system for digital frequency modulation broadcast
EP2645576A1 (en) * 2012-03-30 2013-10-02 Astrium Limited Mitigating a phase anomaly in an analogue-to-digital converter output signal
JP6095165B2 (en) * 2013-05-14 2017-03-15 株式会社日立国際電気 Synchronization method and synchronization apparatus
CN104618012A (en) * 2015-01-23 2015-05-13 国网四川省电力公司信息通信公司 Device and method for generating spectrum amplitude code mark and measuring bit error rate
JP6580289B2 (en) * 2017-05-12 2019-09-25 三菱電機株式会社 Wireless communication device
WO2020093068A1 (en) * 2018-11-03 2020-05-07 The Research Foundation For The State University Of New York Systems and methods for identifying electronic devices
JP2023064016A (en) * 2021-10-25 2023-05-10 公立大学法人公立諏訪東京理科大学 Wireless transmitting method, wireless transmitting device, wireless receiving method, wireless receiving device, and wireless communication method
CN114488874B (en) * 2021-12-24 2023-09-26 上海磐启微电子有限公司 Sampling synchronization method and system for linear frequency modulation signals

Family Cites Families (2)

* Cited by examiner, † Cited by third party
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DE3201934A1 (en) * 1982-01-22 1983-08-04 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt SYSTEM FOR TRANSMITTING DIGITAL INFORMATION SIGNALS
DE4128713A1 (en) * 1991-08-29 1993-03-04 Daimler Benz Ag METHOD AND ARRANGEMENT FOR MEASURING THE CARRIER FREQUENCY STORAGE IN A MULTI-CHANNEL TRANSMISSION SYSTEM

Also Published As

Publication number Publication date
JPH10505471A (en) 1998-05-26
CN1152982A (en) 1997-06-25
WO1996002990A2 (en) 1996-02-01
KR970705262A (en) 1997-09-06
SE514809C2 (en) 2001-04-30
AU2994495A (en) 1996-02-16
WO1996002990A3 (en) 1996-03-14
SE9402464L (en) 1996-01-14

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