WO2003084080A3 - System and method for signal time alignment using programmable matched filter coefficients - Google Patents

System and method for signal time alignment using programmable matched filter coefficients Download PDF

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Publication number
WO2003084080A3
WO2003084080A3 PCT/US2003/009235 US0309235W WO03084080A3 WO 2003084080 A3 WO2003084080 A3 WO 2003084080A3 US 0309235 W US0309235 W US 0309235W WO 03084080 A3 WO03084080 A3 WO 03084080A3
Authority
WO
WIPO (PCT)
Prior art keywords
filter coefficients
matched filter
time alignment
received
time
Prior art date
Application number
PCT/US2003/009235
Other languages
French (fr)
Other versions
WO2003084080A2 (en
Inventor
Donald J Rasmussen
Jeffrey C Schmidt
Original Assignee
Meshnetworks Inc
Donald J Rasmussen
Jeffrey C Schmidt
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, Donald J Rasmussen, Jeffrey C Schmidt filed Critical Meshnetworks Inc
Priority to AU2003223354A priority Critical patent/AU2003223354A1/en
Publication of WO2003084080A2 publication Critical patent/WO2003084080A2/en
Publication of WO2003084080A3 publication Critical patent/WO2003084080A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H04B1/7077—Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H04B1/70758—Multimode search, i.e. using multiple search strategies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/709—Correlator structure
    • H04B1/7093—Matched filter type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/7117—Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

A method and system for time aligning a received transmitted signal with the receiver clock signal is disclosed herein. Time alignment is achieved by applying the proper matched filter coefficients (114) to account for the time difference between received transmitted signal and the receiver clock signal. For direct sequence signals, time alignment is achieved between the spreading chips. For non-direct sequence signals, time alignment is achieved between the symbols. Time alignment is obtained by applying the proper matched filter coefficients (114) to add or subtract propagation delay account for the time difference between the received transmitted signal and received clock signal. The shape of the received synchronization correlation curve is used to determine the selection of the proper matched filter coefficients (114) for fine timing correction. The matched filter coefficients are selected at synchronization and updated throughout the wave form reception. For direct sequence signals with rake receivers, timing alignment is easily applied to multiple rake taps (118).
PCT/US2003/009235 2002-03-27 2003-03-26 System and method for signal time alignment using programmable matched filter coefficients WO2003084080A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003223354A AU2003223354A1 (en) 2002-03-27 2003-03-26 System and method for signal time alignment using programmable matched filter coefficients

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10620702A 2002-03-27 2002-03-27
US10/106,207 2002-03-27

Publications (2)

Publication Number Publication Date
WO2003084080A2 WO2003084080A2 (en) 2003-10-09
WO2003084080A3 true WO2003084080A3 (en) 2004-03-04

Family

ID=28673542

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/009235 WO2003084080A2 (en) 2002-03-27 2003-03-26 System and method for signal time alignment using programmable matched filter coefficients

Country Status (2)

Country Link
AU (1) AU2003223354A1 (en)
WO (1) WO2003084080A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7593454B2 (en) 2005-07-28 2009-09-22 Itt Manufacturing Enterprises, Inc. Enhanced QPSK or DQPSK data demodulation for direct sequence spreading (DSS) system waveforms using orthogonal or near-orthogonal spreading sequences
CN101170534B (en) 2007-10-31 2010-06-23 中兴通讯股份有限公司 A timing rough synchronization capturing method for mobile multimedia broadcast system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5361398A (en) * 1993-01-29 1994-11-01 Motorola, Inc. Method and apparatus for transmission path delay measurements using adaptive demodulation
US5440265A (en) * 1994-09-14 1995-08-08 Sicom, Inc. Differential/coherent digital demodulator operating at multiple symbol points

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5361398A (en) * 1993-01-29 1994-11-01 Motorola, Inc. Method and apparatus for transmission path delay measurements using adaptive demodulation
US5440265A (en) * 1994-09-14 1995-08-08 Sicom, Inc. Differential/coherent digital demodulator operating at multiple symbol points

Also Published As

Publication number Publication date
WO2003084080A2 (en) 2003-10-09
AU2003223354A8 (en) 2003-10-13
AU2003223354A1 (en) 2003-10-13

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