WO1998000946A3 - Timing and frequency synchronization of ofdm signals - Google Patents

Timing and frequency synchronization of ofdm signals Download PDF

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Publication number
WO1998000946A3
WO1998000946A3 PCT/US1997/010946 US9710946W WO9800946A3 WO 1998000946 A3 WO1998000946 A3 WO 1998000946A3 US 9710946 W US9710946 W US 9710946W WO 9800946 A3 WO9800946 A3 WO 9800946A3
Authority
WO
WIPO (PCT)
Prior art keywords
synchronization
ofdm
carriers
ofdm training
numbered sub
Prior art date
Application number
PCT/US1997/010946
Other languages
French (fr)
Other versions
WO1998000946A2 (en
Inventor
Timothy M Schmidl
Donald C Cox
Original Assignee
Univ Leland Stanford Junior
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 Univ Leland Stanford Junior filed Critical Univ Leland Stanford Junior
Publication of WO1998000946A2 publication Critical patent/WO1998000946A2/en
Publication of WO1998000946A3 publication Critical patent/WO1998000946A3/en

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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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • 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
    • H04L27/2657—Carrier 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
    • H04L27/2662—Symbol 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

Abstract

A method and apparatus achieves rapid timing synchronization, carrier frequency synchronization, and sampling rate synchronization of a receiver to an orthogonal frequency division multiplexed (OFDM) signal (132). The method uses two OFDM training symbols (132) to obtain full synchronization in less than two data frames. A first OFDM training symbol has only even-numbered sub-carriers (134) and substantially no odd-numbered sub-carriers, an arrangement that results in half-symbol symmetry. A second OFDM training symbol has even-numbered sub-carriers differentially modulated relative to those of the first OFDM training symbol by a predetermined sequence.
PCT/US1997/010946 1996-06-20 1997-06-19 Timing and frequency synchronization of ofdm signals WO1998000946A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/666,237 1996-06-20
US08/666,237 US5732113A (en) 1996-06-20 1996-06-20 Timing and frequency synchronization of OFDM signals

Publications (2)

Publication Number Publication Date
WO1998000946A2 WO1998000946A2 (en) 1998-01-08
WO1998000946A3 true WO1998000946A3 (en) 1998-05-14

Family

ID=24673373

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/010946 WO1998000946A2 (en) 1996-06-20 1997-06-19 Timing and frequency synchronization of ofdm signals

Country Status (2)

Country Link
US (1) US5732113A (en)
WO (1) WO1998000946A2 (en)

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US9036538B2 (en) 2005-04-19 2015-05-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9408220B2 (en) 2005-04-19 2016-08-02 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
US8885628B2 (en) 2005-08-08 2014-11-11 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
US9240877B2 (en) 2005-08-22 2016-01-19 Qualcomm Incorporated Segment sensitive scheduling
US8842619B2 (en) 2005-10-27 2014-09-23 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems

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WO1998000946A2 (en) 1998-01-08

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