CA2236287A1 - Cdma receiver - Google Patents

Cdma receiver

Info

Publication number
CA2236287A1
CA2236287A1 CA002236287A CA2236287A CA2236287A1 CA 2236287 A1 CA2236287 A1 CA 2236287A1 CA 002236287 A CA002236287 A CA 002236287A CA 2236287 A CA2236287 A CA 2236287A CA 2236287 A1 CA2236287 A1 CA 2236287A1
Authority
CA
Canada
Prior art keywords
phase difference
baseband signal
reception
timing
reception baseband
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
CA002236287A
Other languages
French (fr)
Other versions
CA2236287C (en
Inventor
Kazuhiro Umetsu
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of CA2236287A1 publication Critical patent/CA2236287A1/en
Application granted granted Critical
Publication of CA2236287C publication Critical patent/CA2236287C/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
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • 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
    • 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
    • H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception

Abstract

In a CDMA receiver, an A/D converter over-samples an analog reception baseband signal with a sampling clock a frequency of which is 2n times higher than a chip clock, and converts it into a digital reception baseband signal. A
correlator obtains a correlation value between the digital reception baseband signal and a pilot spreading code which is synchronous with a reception timing. A phase difference detecting unit obtains a phase difference between the digital reception baseband signal and the reception timing based on the correlation value. A timing controlling unit changes the reception timing in such a manner as to eliminate the phase difference obtained by the phase difference detecting unit.
CA002236287A 1997-04-30 1998-04-29 Cdma receiver Expired - Fee Related CA2236287C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP09-124749 1997-04-30
JP9124749A JPH10303782A (en) 1997-04-30 1997-04-30 Cdma receiver

Publications (2)

Publication Number Publication Date
CA2236287A1 true CA2236287A1 (en) 1998-10-30
CA2236287C CA2236287C (en) 2002-03-26

Family

ID=14893170

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002236287A Expired - Fee Related CA2236287C (en) 1997-04-30 1998-04-29 Cdma receiver

Country Status (6)

Country Link
US (1) US6236648B1 (en)
EP (1) EP0876000A3 (en)
JP (1) JPH10303782A (en)
KR (1) KR100294313B1 (en)
CN (1) CN1097369C (en)
CA (1) CA2236287C (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100364754B1 (en) * 1999-12-02 2002-12-16 엘지전자 주식회사 apparatus for searching PN code rapidly
AU2000250581A1 (en) * 2000-06-05 2001-12-24 Linkair Communications. Inc. The synchronization capture method of downline in cdma system
JP4628591B2 (en) * 2001-06-07 2011-02-09 株式会社日立国際電気 Spreading code generation circuit and demodulation circuit
US7231000B2 (en) * 2001-10-22 2007-06-12 Broadcom Corporation System and method for DC offset compensation and bit synchronization
US8363690B2 (en) * 2002-08-28 2013-01-29 Alcatel Lucent Codeword synthesizing system and a correlation system, methods of operation thereof and a spread spectrum communications transceiver employing the same
EP1845736A4 (en) * 2005-01-31 2010-05-05 Zte Corp Baseband process method based on doubling sampling
JP4829571B2 (en) * 2005-09-09 2011-12-07 株式会社日立製作所 Receiver and positioning distance measuring system
CN1929311B (en) * 2006-09-22 2010-05-12 威盛电子股份有限公司 Coder-decoder using single simulation to digital transducer and signal processing method
US7382292B1 (en) * 2006-11-10 2008-06-03 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for efficient signal interpolation
US8849226B2 (en) 2009-08-13 2014-09-30 Cascoda Limited Wireless receiver
GB2472774B (en) * 2009-08-13 2011-10-05 Cascoda Ltd Wireless receiver

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665404A (en) * 1983-10-24 1987-05-12 Offshore Navigation, Inc. High frequency spread spectrum positioning system and method therefor
FR2679096B1 (en) 1991-07-12 1996-06-07 Seb Sa HEATING ASSEMBLY FOR ELECTRIC HEATING APPARATUS, ESPECIALLY KETTLE.
SG43672A1 (en) * 1992-01-24 1997-11-14 Novatel Communications Limited A pseudorandum noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay spacing between early and late correlators
US5590160A (en) * 1992-12-30 1996-12-31 Nokia Mobile Phones Ltd. Symbol and frame synchronization in both a TDMA system and a CDMA
US5349606A (en) * 1992-12-31 1994-09-20 Gte Government Systems Corporation Apparatus for multipath DSSS communications
US5361276A (en) * 1993-09-13 1994-11-01 At&T Bell Laboratories All digital maximum likelihood based spread spectrum receiver
GB2292053B (en) * 1994-07-28 1998-08-26 Roke Manor Research Synchronisation apparatus
KR100220140B1 (en) * 1994-12-28 1999-09-01 다치카와 게이지 Device and method for initially synchronizing spread-spectrum code of cdma transmission system
JPH0918446A (en) 1995-06-28 1997-01-17 Oki Electric Ind Co Ltd Synchronous following circuit
JP2723094B2 (en) * 1995-11-07 1998-03-09 日本電気株式会社 CDMA receiver

Also Published As

Publication number Publication date
KR100294313B1 (en) 2001-07-12
MX9803385A (en) 1998-12-31
CA2236287C (en) 2002-03-26
JPH10303782A (en) 1998-11-13
EP0876000A3 (en) 2000-11-02
US6236648B1 (en) 2001-05-22
EP0876000A2 (en) 1998-11-04
KR19980081748A (en) 1998-11-25
CN1097369C (en) 2002-12-25
CN1198626A (en) 1998-11-11

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20080429