CA2032909A1 - Csk communication system - Google Patents

Csk communication system

Info

Publication number
CA2032909A1
CA2032909A1 CA2032909A CA2032909A CA2032909A1 CA 2032909 A1 CA2032909 A1 CA 2032909A1 CA 2032909 A CA2032909 A CA 2032909A CA 2032909 A CA2032909 A CA 2032909A CA 2032909 A1 CA2032909 A1 CA 2032909A1
Authority
CA
Canada
Prior art keywords
correlation
auto
demodulator
data
peaks
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
CA2032909A
Other languages
French (fr)
Other versions
CA2032909C (en
Inventor
Kaoru Endo
Naomichi Takahashi
Soichi Tsumura
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.)
NEC Corp
Original Assignee
NEC Home Electronics 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
Priority claimed from JP33107089A external-priority patent/JP2711921B2/en
Priority claimed from JP152290A external-priority patent/JP2756010B2/en
Priority claimed from JP2033643A external-priority patent/JPH03238942A/en
Priority claimed from JP3364290A external-priority patent/JP2729693B2/en
Application filed by NEC Home Electronics Ltd filed Critical NEC Home Electronics Ltd
Publication of CA2032909A1 publication Critical patent/CA2032909A1/en
Application granted granted Critical
Publication of CA2032909C publication Critical patent/CA2032909C/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
    • H04B1/709—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0074—Code shifting or hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L23/00—Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00
    • H04L23/02—Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00 adapted for orthogonal signalling

Abstract

The present invention provides new arrangements for various components of a CSK communication system: modulator, correlators, demodulator, carrier detection circuit, and synchronization control circuit. The various improvements provide more accurate demodulation of data from the received signal in the presence of noise and signal deterioration. A modulator configuration permits the CSK system to use two M series codes in which the second code is simply a phase shifted version of the first code. The PN correlators, via shift-registers, efficiently output two correlation signals. The demodulator accepts two correlation signals from the correlators, detects auto-correlation peaks in the correlation signals, and uses the peaks to accurately determine whether the received bit has a value of "1" or "0". The carrier detecting circuit detects the presence of data in the received signal. A carrier detecting circuit conveniently allows demodulation of data without exact synchronization of the center of demodulator's monitoring window to auto-correlation peaks. The synchronization control circuit generates accurate timing pulses that mark the start and end of each data bit. If auto-correlation peaks appear consistently in one location for the duration of N
consecutive data bits, subsequent timing pulses are delayed in accordance with weighted averages of the stored locations of auto-correlation peaks. In one embodiment, separate correlation signal monitoring windows for demodulation and synchronization tracking may be set independently of each other, enabling the demodulator to clearly distinguish between an actual auto-correlation peaks and an inter-correlation peak, and the synchronization control circuit to attain stability by "averaging"
out temporal effects of noise.
CA002032909A 1989-12-22 1990-12-21 Csk communication system Expired - Fee Related CA2032909C (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP33107089A JP2711921B2 (en) 1989-12-22 1989-12-22 Carrier detection method and device
JPHEI.1-331070 1989-12-22
JP152290A JP2756010B2 (en) 1990-01-10 1990-01-10 Synchronization establishment method and apparatus
JPHEI.2-1522 1990-01-10
JP2033643A JPH03238942A (en) 1990-02-16 1990-02-16 Method and apparatus for csk communication, method and apparatus for csk transmission and method and apparatus for csk reception
JPHEI.2-33643 1990-02-16
JP3364290A JP2729693B2 (en) 1990-02-16 1990-02-16 Receiving method and apparatus in CSK communication system
JPHEI.2-33642 1990-02-16

Publications (2)

Publication Number Publication Date
CA2032909A1 true CA2032909A1 (en) 1991-06-23
CA2032909C CA2032909C (en) 1995-10-10

Family

ID=27453425

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002032909A Expired - Fee Related CA2032909C (en) 1989-12-22 1990-12-21 Csk communication system

Country Status (5)

Country Link
US (1) US5132986A (en)
EP (1) EP0439807B1 (en)
AU (2) AU637175B2 (en)
CA (1) CA2032909C (en)
DE (1) DE69033552T2 (en)

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US5515396A (en) * 1994-02-25 1996-05-07 Motorola, Inc. Method and apparatus for selecting a spreading code in a spectrum spread communication system
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US5680414A (en) 1994-09-09 1997-10-21 Omnipoint Corporation Synchronization apparatus and method for spread spectrum receiver
US5610940A (en) * 1994-09-09 1997-03-11 Omnipoint Corporation Method and apparatus for noncoherent reception and correlation of a continous phase modulated signal
US5757847A (en) 1994-09-09 1998-05-26 Omnipoint Corporation Method and apparatus for decoding a phase encoded signal
US5963586A (en) 1994-09-09 1999-10-05 Omnipoint Corporation Method and apparatus for parallel noncoherent correlation of a spread spectrum signal
US5856998A (en) 1994-09-09 1999-01-05 Omnipoint Corporation Method and apparatus for correlating a continuous phase modulated spread spectrum signal
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US5881100A (en) 1994-09-09 1999-03-09 Omnipoint Corporation Method and apparatus for coherent correlation of a spread spectrum signal
US5832028A (en) * 1994-09-09 1998-11-03 Omnipoint Corporation Method and apparatus for coherent serial correlation of a spread spectrum signal
US5627856A (en) * 1994-09-09 1997-05-06 Omnipoint Corporation Method and apparatus for receiving and despreading a continuous phase-modulated spread spectrum signal using self-synchronizing correlators
US5754584A (en) 1994-09-09 1998-05-19 Omnipoint Corporation Non-coherent spread-spectrum continuous-phase modulation communication system
US5692007A (en) 1994-09-09 1997-11-25 Omnipoint Corporation Method and apparatus for differential phase encoding and decoding in spread-spectrum communication systems with continuous-phase modulation
US5648982A (en) * 1994-09-09 1997-07-15 Omnipoint Corporation Spread spectrum transmitter
US5629956A (en) * 1994-09-09 1997-05-13 Omnipoint Corporation Method and apparatus for reception and noncoherent serial correlation of a continuous phase modulated signal
US5754585A (en) 1994-09-09 1998-05-19 Omnipoint Corporation Method and apparatus for serial noncoherent correlation of a spread spectrum signal
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US6101213A (en) * 1997-03-21 2000-08-08 Glynn Scientific, Inc. Method system and computer program product for spread spectrum communication using circular waveform shift-keying
US5946344A (en) * 1997-04-07 1999-08-31 Intermec Ip Corp. Multiple-rate direct sequence architecture utilizing a fixed chipping rate and variable spreading code lengths
JP3380446B2 (en) * 1997-10-20 2003-02-24 株式会社鷹山 Receiver for CDMA communication system
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US6868419B1 (en) * 1999-10-28 2005-03-15 Lightwaves Systems Inc. Method of transmitting data including a structured linear database
US9900734B2 (en) 1999-10-28 2018-02-20 Lightwaves Systems, Inc. Method for routing data packets using an IP address based on geo position
JP4072299B2 (en) * 1999-11-30 2008-04-09 シャープ株式会社 Matched filter and large-scale integrated circuit and communication system using the same
US7545868B2 (en) * 2001-03-20 2009-06-09 Lightwaves Systems, Inc. High bandwidth data transport system
US8766773B2 (en) * 2001-03-20 2014-07-01 Lightwaves Systems, Inc. Ultra wideband radio frequency identification system, method, and apparatus
US7983349B2 (en) * 2001-03-20 2011-07-19 Lightwaves Systems, Inc. High bandwidth data transport system
US6727790B2 (en) * 2001-08-20 2004-04-27 Itran Communications Ltd. Acquisition of sychronization in a spread spectrum communications transceiver
US7577188B1 (en) * 2001-09-13 2009-08-18 Cisco Technology, Inc. Physical layer and MAC enhancements using complex sequences on a wireless channel
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US7876738B2 (en) * 2004-03-02 2011-01-25 Nokia Corporation Preventing an incorrect synchronization between a received code-modulated signal and a replica code
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US4707839A (en) * 1983-09-26 1987-11-17 Harris Corporation Spread spectrum correlator for recovering CCSK data from a PN spread MSK waveform
AU617885B2 (en) * 1988-10-24 1991-12-05 Nec Corporation Spectrum spread communication by csk modulation

Also Published As

Publication number Publication date
DE69033552D1 (en) 2000-06-29
AU3379293A (en) 1993-04-22
CA2032909C (en) 1995-10-10
EP0439807A3 (en) 1992-12-30
AU6838490A (en) 1991-06-27
EP0439807B1 (en) 2000-05-24
US5132986A (en) 1992-07-21
DE69033552T2 (en) 2001-02-08
EP0439807A2 (en) 1991-08-07
AU643400B2 (en) 1993-11-11
AU637175B2 (en) 1993-05-20

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EEER Examination request
MKLA Lapsed
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Effective date: 20021223