AU2001237420A1 - Method and apparatus for fast detection of locations of path rays in a rake receiver - Google Patents

Method and apparatus for fast detection of locations of path rays in a rake receiver

Info

Publication number
AU2001237420A1
AU2001237420A1 AU2001237420A AU3742001A AU2001237420A1 AU 2001237420 A1 AU2001237420 A1 AU 2001237420A1 AU 2001237420 A AU2001237420 A AU 2001237420A AU 3742001 A AU3742001 A AU 3742001A AU 2001237420 A1 AU2001237420 A1 AU 2001237420A1
Authority
AU
Australia
Prior art keywords
locations
location
path
time reference
time
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
AU2001237420A
Inventor
Roozbeh Atarius
Erik Dahlback
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson 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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of AU2001237420A1 publication Critical patent/AU2001237420A1/en
Abandoned legal-status Critical Current

Links

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
    • H04B1/7085—Synchronisation aspects using a code tracking loop, e.g. a delay-locked loop
    • 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
    • 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
    • H04B1/7113—Determination of path profile

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Measurement Of Radiation (AREA)

Abstract

Locations of path rays in a multi-path channel receiver having multiple time references are detected, e.g., when the receiver switches time references. Locations of received path rays are searched for and determined. The locations are tracked for a predetermined amount of time. If the locations are lost after a predetermined amount of time, a new search for the locations of the received path rays is initiated. The searching may include determining a probable location of a most significant path ray, shifting the location within a predetermined interval, analyzing each shifted location to determine whether the shifted location corresponds to the actual location of the received path ray, and depending on the analysis results, completing the search or determining a probable location of a next most significant ray. The analysis may be performed by correlating each shifted location with a pilot sequence and determining if the correlation results exceed a predetermined threshold. If the correlation results do not exceed the threshold, a determination is made whether all the most significant path rays have been analyzed, and if so, a complete search for the path ray location is initiated. When switching from a time reference of low accuracy to a time reference of high accuracy, the low accuracy time reference may be calibrated to the high accuracy time reference based on averaged measurements of the ratio of clock cycles of the time reference of high accuracy to the clock cycles of the time reference of low accuracy.
AU2001237420A 2000-03-02 2001-02-28 Method and apparatus for fast detection of locations of path rays in a rake receiver Abandoned AU2001237420A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/518,063 US6873648B1 (en) 2000-03-02 2000-03-02 Method and apparatus for fast detection of locations of path rays in a receiver having multiple time references
US09518063 2000-03-02
PCT/EP2001/002247 WO2001065714A1 (en) 2000-03-02 2001-02-28 Method and apparatus for fast detection of locations of path rays in a rake receiver

Publications (1)

Publication Number Publication Date
AU2001237420A1 true AU2001237420A1 (en) 2001-09-12

Family

ID=24062386

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2001237420A Abandoned AU2001237420A1 (en) 2000-03-02 2001-02-28 Method and apparatus for fast detection of locations of path rays in a rake receiver

Country Status (8)

Country Link
US (1) US6873648B1 (en)
EP (1) EP1260032B1 (en)
JP (1) JP2003526250A (en)
AT (1) ATE294465T1 (en)
AU (1) AU2001237420A1 (en)
DE (1) DE60110389T2 (en)
MY (1) MY123571A (en)
WO (1) WO2001065714A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1173486C (en) * 2000-07-03 2004-10-27 三菱电机株式会社 Timing correcting device and timing correcting method thereof
JP3476009B2 (en) * 2000-10-11 2003-12-10 日本電気株式会社 Mobile station and its finger assignment method in CDMA communication system
US7043217B2 (en) * 2000-12-04 2006-05-09 Mitsubishi Denki Kabushiki Kaisha Combining reception method and apparatus
JP3637333B2 (en) 2002-07-05 2005-04-13 株式会社東芝 Spread spectrum communication apparatus and control method thereof
US20040042411A1 (en) * 2002-08-30 2004-03-04 Erik Dahlback Method and apparatus for controlling the rate of path searching in a communications system
DE10334064B3 (en) * 2003-07-25 2005-04-14 Infineon Technologies Ag Method and circuit arrangement for calibrating a sampling control signal of a sampling phase selection element which influences the sampling instant of a received signal
US20070021086A1 (en) * 2005-07-22 2007-01-25 Industrial Technology Research Institute Method for path selection and signal processing in wireless communications system
US9042491B2 (en) 2013-01-17 2015-05-26 Qualcomm Incorporated Systems, apparatus, and methods for receiving paging messages by creating fat paths in fast fading scenarios

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05127772A (en) * 1991-11-01 1993-05-25 Matsushita Electric Ind Co Ltd Clock oscillation device
US5353332A (en) 1992-09-16 1994-10-04 Ericsson Ge Mobile Communications Inc. Method and apparatus for communication control in a radiotelephone system
US5490165A (en) 1993-10-28 1996-02-06 Qualcomm Incorporated Demodulation element assignment in a system capable of receiving multiple signals
JP2605648B2 (en) * 1994-12-22 1997-04-30 日本電気株式会社 Despreading code phase detector for SS receiver
FR2737362B1 (en) 1995-07-25 1997-10-10 Matra Communication PROCESS FOR SELECTING THE PROPAGATION DELAYS RETAINED TO RECEIVE MESSAGES TRANSMITTED BY RADIOCOMMUNICATION WITH A SPREAD OF SPECTRUM
FI100494B (en) 1995-11-20 1997-12-15 Nokia Telecommunications Oy Procedure for controlling recipients and recipients
US5790589A (en) * 1996-08-14 1998-08-04 Qualcomm Incorporated System and method for rapidly reacquiring a pilot channel
JP3228405B2 (en) 1996-12-25 2001-11-12 株式会社エヌ・ティ・ティ・ドコモ Receiver of direct spread CDMA transmission system
JPH10190568A (en) * 1996-12-27 1998-07-21 Matsushita Electric Ind Co Ltd Radio receiving device
US6016312A (en) 1997-02-28 2000-01-18 Motorola, Inc. Radiotelephone and method for clock calibration for slotted paging mode in a CDMA radiotelephone system
JP2853705B2 (en) 1997-05-07 1999-02-03 日本電気株式会社 Spread spectrum communication receiver
JPH1117649A (en) * 1997-06-25 1999-01-22 Kokusai Electric Co Ltd Rake synthesis path detection system and rake synthesis path detection circuit
US6366599B1 (en) * 1998-03-16 2002-04-02 Trimble Navigation Limited Fast acquisition of spread-spectrum signals by dynamically varying spacing of search bins
JP2000031889A (en) * 1998-07-13 2000-01-28 Hitachi Ltd Mobile communication terminal of spread spectrum communication system
US6560273B1 (en) * 1998-10-07 2003-05-06 Ericsson Inc. Delay searcher and delay trackers interaction for new delays assignment to rake fingers
US6453181B1 (en) * 1999-11-04 2002-09-17 Qualcomm, Incorporated Method and apparatus for compensating for frequency drift in a low frequency sleep clock within a mobile station operating in a slotted paging mode
WO2001039698A1 (en) * 1999-12-01 2001-06-07 Board Of Trustees Of The Leland Stanford Junior University Multipath and tracking error reduction method for spread-spectrum receivers

Also Published As

Publication number Publication date
DE60110389D1 (en) 2005-06-02
US6873648B1 (en) 2005-03-29
EP1260032B1 (en) 2005-04-27
MY123571A (en) 2006-05-31
ATE294465T1 (en) 2005-05-15
WO2001065714A1 (en) 2001-09-07
JP2003526250A (en) 2003-09-02
DE60110389T2 (en) 2005-10-06
EP1260032A1 (en) 2002-11-27

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