CA2241712A1 - Finger assignment system for a multiple finger receiver and method thereof - Google Patents

Finger assignment system for a multiple finger receiver and method thereof

Info

Publication number
CA2241712A1
CA2241712A1 CA002241712A CA2241712A CA2241712A1 CA 2241712 A1 CA2241712 A1 CA 2241712A1 CA 002241712 A CA002241712 A CA 002241712A CA 2241712 A CA2241712 A CA 2241712A CA 2241712 A1 CA2241712 A1 CA 2241712A1
Authority
CA
Canada
Prior art keywords
offset
receiver
finger
fingers
difference
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.)
Granted
Application number
CA002241712A
Other languages
French (fr)
Other versions
CA2241712C (en
Inventor
James Basso
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.)
Nokia of America Corp
Original Assignee
Lucent Technologies Inc
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 Lucent Technologies Inc filed Critical Lucent Technologies Inc
Publication of CA2241712A1 publication Critical patent/CA2241712A1/en
Application granted granted Critical
Publication of CA2241712C publication Critical patent/CA2241712C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H04B1/7117—Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers

Abstract

A finger assignment system prevents the assignment of receiver fingers to the same multipath component and to avoid the inefficiencies associated with current schemes. The finger assignment system accomplishes this by setting an offset or delay difference between the offsets or delays assigned to any two fingers, and if the offset or delay difference is violated, adjusting the offset(s) or delay(s) of one or both of the fingers to differ from each other by at least the offset difference. In certain embodiments, the receiver establishes an offset or delay difference between the offsets or delays assigned to any two fingers which are receiving signals from the same antenna. If the offset difference is violated, the finger assignment system adjusts the assigned offset or delay of the weaker finger to differ from the assigned offset of the stronger finger by at least the offset difference. Thus, the receiver scheme according to the principles of the present invention tends to have more receiver fingers tracking more multipath components a higher percentage of the time. The more effective use of the receiver fingers according to the principles of the present invention tends to increase the multipath diversity of the receiver and to improve the average SNR of the receiver.
CA002241712A 1997-07-31 1998-06-25 Finger assignment system for a multiple finger receiver and method thereof Expired - Fee Related CA2241712C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/903,626 1997-07-31
US08/903,626 US6345078B1 (en) 1997-07-31 1997-07-31 Finger assignment system for a multiple finger receiver and method thereof

Publications (2)

Publication Number Publication Date
CA2241712A1 true CA2241712A1 (en) 1999-01-31
CA2241712C CA2241712C (en) 2002-10-01

Family

ID=25417815

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002241712A Expired - Fee Related CA2241712C (en) 1997-07-31 1998-06-25 Finger assignment system for a multiple finger receiver and method thereof

Country Status (5)

Country Link
US (1) US6345078B1 (en)
EP (1) EP0896438B1 (en)
JP (2) JP3425372B2 (en)
CA (1) CA2241712C (en)
DE (1) DE69800348T2 (en)

Families Citing this family (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6078611A (en) * 1997-09-16 2000-06-20 Motorola, Inc. Rake receiver and finger management method for spread spectrum communication
US6515977B2 (en) * 1997-11-05 2003-02-04 Lucent Technologies Inc. De-assigning signals from the fingers of a rake receiver
US6421334B1 (en) * 1998-05-13 2002-07-16 Nortel Networks Limited Technique for time alignment of uplink CDMA signals
JP3031349B2 (en) * 1998-09-02 2000-04-10 日本電気株式会社 CDMA signal receiver
JP3031353B1 (en) * 1998-09-29 2000-04-10 日本電気株式会社 Receiving circuit, mobile terminal having the same, and receiving method
DE19845620A1 (en) * 1998-10-05 2000-04-27 Systemonic Ag Method for receiving spread spectrum signals
US6560273B1 (en) * 1998-10-07 2003-05-06 Ericsson Inc. Delay searcher and delay trackers interaction for new delays assignment to rake fingers
JP2000252871A (en) * 1999-03-01 2000-09-14 Sony Corp Method and device for receiving
US6314130B1 (en) * 1999-04-28 2001-11-06 Dspc Technologies, Ltd. System and method for joint time tracking of multiple paths
JP3319436B2 (en) * 1999-06-02 2002-09-03 日本電気株式会社 CDMA mobile communication device, searcher circuit, and communication method
US7184457B2 (en) * 2000-02-28 2007-02-27 Texas Instruments Incorporated Spread spectrum path estimation
ATE332591T1 (en) * 2000-03-30 2006-07-15 Aeroflex Cambridge Ltd RAKE RECEIVER AND METHOD FOR OPERATING A RAKE RECEIVER
GB0007750D0 (en) * 2000-03-30 2000-05-17 Ubinetics Ltd A rake receiver and a method of operating a rake receiver
DE60033938T2 (en) * 2000-07-03 2007-12-06 Mitsubishi Denki K.K. DEVICE AND METHOD FOR CORRECTING TIME-OUT
US6647077B1 (en) * 2000-07-31 2003-11-11 Rf Micro Devices, Inc. Multipath parameter estimation in spread-spectrum communications systems
US6600777B1 (en) * 2000-09-29 2003-07-29 Qualcomm, Incorporated Assignment and deassignment of CDMA second finger
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
JP3441431B2 (en) 2000-11-09 2003-09-02 日本電気株式会社 RAKE receiver and receiving method
US7043217B2 (en) * 2000-12-04 2006-05-09 Mitsubishi Denki Kabushiki Kaisha Combining reception method and apparatus
US7769078B2 (en) 2000-12-22 2010-08-03 Telefonaktiebolaget Lm Ericsson (Publ) Apparatus, methods and computer program products for delay selection in a spread-spectrum receiver
US6771692B2 (en) * 2001-01-11 2004-08-03 Qualcomm Incorporated Time tracking in a non-negligible multipath spacing environment
US6731676B2 (en) * 2001-01-11 2004-05-04 Qualcomm Inc Assigning clusters of demodulation elements in a spread spectrum system
US7277471B2 (en) 2001-01-11 2007-10-02 Qualcomm Incorporated Time-tracking for clustered demodulation elements in a spread spectrum system
JP3857528B2 (en) * 2001-01-12 2006-12-13 富士通株式会社 Synchronous detection device
US6970499B2 (en) * 2001-05-30 2005-11-29 Koninklijke Philips Electronics N.V. Varying early-late spacing in a delay locked loop
US7012952B2 (en) * 2001-08-01 2006-03-14 Qualcomm Incorporated Method and apparatus for adjusting delay in systems with time-burst pilot and fractionally spaced equalizers
GB2385498A (en) * 2002-02-13 2003-08-20 Pa Consulting Services Adjustable baseband processing of telecommunications signals
US7190750B2 (en) * 2002-02-28 2007-03-13 Qualcomm Incorporated Rake receiver for tracking closely spaced multipath
TWI236245B (en) * 2002-03-07 2005-07-11 Benq Corp Method of tracking finger assignment
US7190929B2 (en) * 2002-03-15 2007-03-13 Benq Corporation Method and apparatus of RAKE finger management in RAKE receiver
US6795452B2 (en) 2002-05-31 2004-09-21 Sandbridge Technologies, Inc. Method of tracking time intervals for a communication signal
US7194051B2 (en) 2002-06-13 2007-03-20 Qualcomm Incorporated Finger merge protection for rake receivers
US7061971B2 (en) * 2002-07-11 2006-06-13 Qualcomm Incorporated Method and apparatus for diversity searching and demodulator assignment in a wireless communication system
US7340017B1 (en) * 2002-07-30 2008-03-04 National Semiconductor Corporation System and method for finger management in a rake receiver
US20040072553A1 (en) * 2002-09-20 2004-04-15 Xiaohui Wang Methods, systems, and computer program products for selecting delay positions for a RAKE receiver by adjusting the delay positions based on comparisons of signal to interference ratios and/or powers for multi-path signals over time
EP1551109B1 (en) * 2004-01-05 2009-11-25 STMicroelectronics N.V. Method of cancelling of false echoes in a Rake receiver
US7058117B1 (en) * 2004-07-26 2006-06-06 Sandbridge Technologies, Inc. Rake receiver with multi-path interference accommodation
US7403557B2 (en) * 2004-07-27 2008-07-22 Nokia Corporation Apparatus and method for hybrid traffic and pilot signal quality determination of finger lock status of rake receiver correlators
US7630427B2 (en) * 2005-09-29 2009-12-08 Qualcomm Incorporated Systems, methods, and apparatus for establishing finger lock state
CN102142860B (en) * 2010-01-29 2014-01-29 上海摩波彼克半导体有限公司 Method for multi-path combining control of RAKE receiver in third-generation mobile communication system

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5233626A (en) 1992-05-11 1993-08-03 Space Systems/Loral Inc. Repeater diversity spread spectrum communication system
JP3296822B2 (en) * 1993-06-14 2002-07-02 テレフオンアクチーボラゲツト エル エム エリクソン Time alignment of transmission in downlink of CDMA system
US5490165A (en) 1993-10-28 1996-02-06 Qualcomm Incorporated Demodulation element assignment in a system capable of receiving multiple signals
JP2605615B2 (en) * 1993-12-30 1997-04-30 日本電気株式会社 Spread spectrum receiver
JPH07335209A (en) 1994-06-10 1995-12-22 Matsushita Electric Ind Co Ltd Coated electrode for battery, and its manufacture
US6173014B1 (en) * 1994-08-02 2001-01-09 Telefonaktiebolaget Lm Ericsson Method of and apparatus for interference rejection combining and downlink beamforming in a cellular radio communications system
US5710768A (en) * 1994-09-30 1998-01-20 Qualcomm Incorporated Method of searching for a bursty signal
US5619524A (en) * 1994-10-04 1997-04-08 Motorola, Inc. Method and apparatus for coherent communication reception in a spread-spectrum communication system
US5691974A (en) * 1995-01-04 1997-11-25 Qualcomm Incorporated Method and apparatus for using full spectrum transmitted power in a spread spectrum communication system for tracking individual recipient phase, time and energy
US5659353A (en) * 1995-03-17 1997-08-19 Bell Atlantic Network Services, Inc. Television distribution system and method
US5671221A (en) * 1995-06-14 1997-09-23 Sharp Microelectronics Technology, Inc. Receiving method and apparatus for use in a spread-spectrum communication system
JPH0974372A (en) * 1995-09-04 1997-03-18 Matsushita Electric Ind Co Ltd Spread spectrum radio transmitter-receiver
JP3745430B2 (en) * 1995-12-22 2006-02-15 株式会社エヌ・ティ・ティ・ドコモ CDMA multipath search method and CDMA signal receiver
JP2820918B2 (en) * 1996-03-08 1998-11-05 株式会社ワイ・アール・ピー移動通信基盤技術研究所 Spread spectrum communication equipment
US6047017A (en) * 1996-04-25 2000-04-04 Cahn; Charles R. Spread spectrum receiver with multi-path cancellation
US5818887A (en) * 1996-07-26 1998-10-06 Motorola, Inc. Method for receiving a signal in a digital radio frequency communication system
US6009089A (en) * 1996-08-20 1999-12-28 Lucent Technologies Inc. Pilot interference cancellation for a coherent wireless code division multiple access receiver
US5945948A (en) * 1996-09-03 1999-08-31 Motorola, Inc. Method and apparatus for location finding in a communication system
US5887021A (en) * 1996-09-23 1999-03-23 Nokia Telecommunications Oy Base station receiver and a method for receiving a signal
US5920284A (en) * 1996-09-30 1999-07-06 Qualcomm Incorporated Ambiguity resolution for ambiguous position solutions using satellite beams

Also Published As

Publication number Publication date
EP0896438A1 (en) 1999-02-10
JPH1198056A (en) 1999-04-09
DE69800348D1 (en) 2000-11-16
DE69800348T2 (en) 2001-02-22
JP3676352B2 (en) 2005-07-27
JP3425372B2 (en) 2003-07-14
US6345078B1 (en) 2002-02-05
JP2003244029A (en) 2003-08-29
EP0896438B1 (en) 2000-10-11
CA2241712C (en) 2002-10-01

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20090625