WO2002029999A1 - Despreading circuit - Google Patents

Despreading circuit Download PDF

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Publication number
WO2002029999A1
WO2002029999A1 PCT/JP2001/008809 JP0108809W WO0229999A1 WO 2002029999 A1 WO2002029999 A1 WO 2002029999A1 JP 0108809 W JP0108809 W JP 0108809W WO 0229999 A1 WO0229999 A1 WO 0229999A1
Authority
WO
WIPO (PCT)
Prior art keywords
correlation value
correlators
received signal
searcher
finger
Prior art date
Application number
PCT/JP2001/008809
Other languages
French (fr)
Japanese (ja)
Inventor
Hideo Omura
Original Assignee
Nec Corporation
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 Nec Corporation filed Critical Nec Corporation
Publication of WO2002029999A1 publication Critical patent/WO2002029999A1/en

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
    • H04B1/709—Correlator structure
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70707—Efficiency-related aspects
    • H04B2201/7071—Efficiency-related aspects with dynamic control of receiver resources

Abstract

A searcher operation and a finger operation are carried out in different time domains, and thereby correlators (300-0 to 300-i) are shared for both searcher and finger operations. In the searcher operation mode, the correlators (300-0 to 300-i) determine a first correlation value being the correlation value between the replica signal of a pilot symbol and the received signal. In the finger operation mode, the correlators (300-0 to 300-i) determine a second correlation value being the correlation value between the corresponding signature sequence delayed according to the first correlation value and the received signal. The second correlation value is used for channel inference and rake synthesis. Thus, the received signal and one of the replica signal and the delayed corresponding signature sequence are selectively inputted to the correlators (300-0 to 300-i). The selection is carried out by a selection circuit (40) according to the time domain. The selection circuit (40) may determine the ratio of the time domain assigned to the calculation of the first correlation value to that of the second one depending on the quantity and quality of the received signal.
PCT/JP2001/008809 2000-10-05 2001-10-05 Despreading circuit WO2002029999A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000306541A JP2002118492A (en) 2000-10-05 2000-10-05 Reverse diffusing circuit
JP2000-306541 2000-10-05

Publications (1)

Publication Number Publication Date
WO2002029999A1 true WO2002029999A1 (en) 2002-04-11

Family

ID=18787210

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/008809 WO2002029999A1 (en) 2000-10-05 2001-10-05 Despreading circuit

Country Status (2)

Country Link
JP (1) JP2002118492A (en)
WO (1) WO2002029999A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10310126A1 (en) * 2003-02-28 2004-05-19 Siemens Ag Evaluating signals in radio system receiver station involves correlating first transmitter station signals with associated code, delay time, assigning correlators to correlate second station signals
CN101217817B (en) * 2008-01-09 2010-09-15 华为技术有限公司 Channel searching device, method and system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4592188B2 (en) * 2001-01-11 2010-12-01 株式会社東芝 Mobile communication terminal and its baseband signal processing module
JP3992459B2 (en) * 2001-07-23 2007-10-17 富士通株式会社 Receiving device, receiving method, and semiconductor device
US6967989B2 (en) * 2002-05-17 2005-11-22 Motorola, Inc. Method and apparatus for time-sharing a rake receiver structure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0758665A (en) * 1993-08-10 1995-03-03 Sony Corp Reception method and device for spread spectrum communications
JPH10294717A (en) * 1996-09-24 1998-11-04 Oki Telecom Inc Cdma modem circuit, cdma wireless telephone method, combination finger/searcher circuit and searcher circuit
JPH11154931A (en) * 1997-11-19 1999-06-08 Matsushita Electric Ind Co Ltd Rake receiver, a mobile set of portable telephone set using it and base station
JPH11261440A (en) * 1998-03-11 1999-09-24 Oki Electric Ind Co Ltd Receiver
JP2000134181A (en) * 1998-10-23 2000-05-12 Hitachi Ltd Communication equipment in mobile communication system adopting code division multiple access system
JP2001203607A (en) * 2000-01-18 2001-07-27 Oki Electric Ind Co Ltd Reception synchronization circuit and reception synchronization device using it

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0758665A (en) * 1993-08-10 1995-03-03 Sony Corp Reception method and device for spread spectrum communications
JPH10294717A (en) * 1996-09-24 1998-11-04 Oki Telecom Inc Cdma modem circuit, cdma wireless telephone method, combination finger/searcher circuit and searcher circuit
JPH11154931A (en) * 1997-11-19 1999-06-08 Matsushita Electric Ind Co Ltd Rake receiver, a mobile set of portable telephone set using it and base station
JPH11261440A (en) * 1998-03-11 1999-09-24 Oki Electric Ind Co Ltd Receiver
JP2000134181A (en) * 1998-10-23 2000-05-12 Hitachi Ltd Communication equipment in mobile communication system adopting code division multiple access system
JP2001203607A (en) * 2000-01-18 2001-07-27 Oki Electric Ind Co Ltd Reception synchronization circuit and reception synchronization device using it

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10310126A1 (en) * 2003-02-28 2004-05-19 Siemens Ag Evaluating signals in radio system receiver station involves correlating first transmitter station signals with associated code, delay time, assigning correlators to correlate second station signals
CN101217817B (en) * 2008-01-09 2010-09-15 华为技术有限公司 Channel searching device, method and system

Also Published As

Publication number Publication date
JP2002118492A (en) 2002-04-19

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