CA2103305A1 - Spread spectrum communication system - Google Patents

Spread spectrum communication system

Info

Publication number
CA2103305A1
CA2103305A1 CA002103305A CA2103305A CA2103305A1 CA 2103305 A1 CA2103305 A1 CA 2103305A1 CA 002103305 A CA002103305 A CA 002103305A CA 2103305 A CA2103305 A CA 2103305A CA 2103305 A1 CA2103305 A1 CA 2103305A1
Authority
CA
Canada
Prior art keywords
correlation
communication system
spread spectrum
improved performance
spectrum communication
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
CA002103305A
Other languages
French (fr)
Other versions
CA2103305C (en
Inventor
Ralph W. Schoolcraft
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.)
DirecTV Group Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2103305A1 publication Critical patent/CA2103305A1/en
Application granted granted Critical
Publication of CA2103305C publication Critical patent/CA2103305C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • 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

Abstract

"Spread spectrum communication system" A pseudo-noise (PN) correlation and demodulation method and apparatus, in which received signals are correlated with locally generated PN codes and correlation measurements are maintained for multiple time bins corresponding to signals received over possible multiple paths. Instead of selecting one or a small number of significant correlation measurements to control data demodulation, the method of the invention performs data demodulation over the multiple time bins, and then selects data values corresponding to significant correlation measurements and combines the selected data values, weighting them in accordance with their relative strengths a determined during correlation. Use of the invention provides improved performance in terms of signal quality and continuity in the presence of multipath conditions. Careful selection of design parameters allows the improved performance to be obtained in a compact and easily portable implementation including transmitter and receiver modules.
CA002103305A 1992-11-20 1993-11-17 Spread spectrum communication system Expired - Lifetime CA2103305C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/979,123 US5237587A (en) 1992-11-20 1992-11-20 Pseudo-noise modem and related digital correlation method
US979,123 1992-11-20

Publications (2)

Publication Number Publication Date
CA2103305A1 true CA2103305A1 (en) 1994-05-21
CA2103305C CA2103305C (en) 2004-01-06

Family

ID=25526716

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002103305A Expired - Lifetime CA2103305C (en) 1992-11-20 1993-11-17 Spread spectrum communication system

Country Status (7)

Country Link
US (1) US5237587A (en)
EP (1) EP0599391A3 (en)
JP (1) JPH06296171A (en)
KR (1) KR940012875A (en)
CN (1) CN1073319C (en)
AU (2) AU5181293A (en)
CA (1) CA2103305C (en)

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Also Published As

Publication number Publication date
JPH06296171A (en) 1994-10-21
AU5181193A (en) 1994-06-02
CN1073319C (en) 2001-10-17
CN1103222A (en) 1995-05-31
KR940012875A (en) 1994-06-24
AU5181293A (en) 1994-06-02
US5237587A (en) 1993-08-17
CA2103305C (en) 2004-01-06
AU672443B2 (en) 1996-10-03
EP0599391A2 (en) 1994-06-01
EP0599391A3 (en) 1994-12-14

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Effective date: 20131118

MKEX Expiry

Effective date: 20131118