WO2004109475A3 - System and method for determining synchronization point in ofdm modems for accurate time of flight measurement - Google Patents

System and method for determining synchronization point in ofdm modems for accurate time of flight measurement Download PDF

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Publication number
WO2004109475A3
WO2004109475A3 PCT/US2004/018129 US2004018129W WO2004109475A3 WO 2004109475 A3 WO2004109475 A3 WO 2004109475A3 US 2004018129 W US2004018129 W US 2004018129W WO 2004109475 A3 WO2004109475 A3 WO 2004109475A3
Authority
WO
WIPO (PCT)
Prior art keywords
accurate time
synchronization point
flight measurement
determining synchronization
modems
Prior art date
Application number
PCT/US2004/018129
Other languages
French (fr)
Other versions
WO2004109475A2 (en
WO2004109475B1 (en
Inventor
Pertti O Alapuranen
Original Assignee
Meshnetworks Inc
Pertti O Alapuranen
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 Meshnetworks Inc, Pertti O Alapuranen filed Critical Meshnetworks Inc
Priority to JP2006509082A priority Critical patent/JP2006526938A/en
Priority to EP04754680A priority patent/EP1652207A4/en
Publication of WO2004109475A2 publication Critical patent/WO2004109475A2/en
Publication of WO2004109475A3 publication Critical patent/WO2004109475A3/en
Publication of WO2004109475B1 publication Critical patent/WO2004109475B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • 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
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Abstract

A system and method including an algorithm that can use the linear time shift property of the subcarrier modulation to provide accurate frame synchronization for communications between nodes in a wireless network, where nodes employ orthogonal frequency division multiplexing (OFDM) modems. The subcarrier modulation is typically performed with a Fast Fourier Transform (FFT) that includes a time shift between Inverse Fast Fourier Transform (IFFT) and guard interval insertion at transmission, but due to the guard insertion, the system and method of the present invention corrects the time shifts allowing accurate TOF calculations.
PCT/US2004/018129 2003-06-05 2004-06-07 System and method for determining synchronization point in ofdm modems for accurate time of flight measurement WO2004109475A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2006509082A JP2006526938A (en) 2003-06-05 2004-06-07 System and method for determining synchronization points in an OFDM modem for accurate time of flight measurements
EP04754680A EP1652207A4 (en) 2003-06-05 2004-06-07 System and method for determining synchronization point in ofdm modems for accurate time of flight measurement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47588303P 2003-06-05 2003-06-05
US60/475,883 2003-06-05

Publications (3)

Publication Number Publication Date
WO2004109475A2 WO2004109475A2 (en) 2004-12-16
WO2004109475A3 true WO2004109475A3 (en) 2005-06-23
WO2004109475B1 WO2004109475B1 (en) 2005-08-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/018129 WO2004109475A2 (en) 2003-06-05 2004-06-07 System and method for determining synchronization point in ofdm modems for accurate time of flight measurement

Country Status (5)

Country Link
US (1) US7116632B2 (en)
EP (1) EP1652207A4 (en)
JP (1) JP2006526938A (en)
KR (1) KR100722184B1 (en)
WO (1) WO2004109475A2 (en)

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Also Published As

Publication number Publication date
EP1652207A2 (en) 2006-05-03
JP2006526938A (en) 2006-11-24
US7116632B2 (en) 2006-10-03
EP1652207A4 (en) 2011-12-28
WO2004109475A2 (en) 2004-12-16
KR20060015638A (en) 2006-02-17
KR100722184B1 (en) 2007-05-29
WO2004109475B1 (en) 2005-08-18
US20040252630A1 (en) 2004-12-16

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