WO2001047171A3 - Strong signal cancellation to enhance processing of weak spread spectrum signal - Google Patents

Strong signal cancellation to enhance processing of weak spread spectrum signal Download PDF

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Publication number
WO2001047171A3
WO2001047171A3 PCT/US2000/042171 US0042171W WO0147171A3 WO 2001047171 A3 WO2001047171 A3 WO 2001047171A3 US 0042171 W US0042171 W US 0042171W WO 0147171 A3 WO0147171 A3 WO 0147171A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
strong
weak
spread spectrum
predicted
Prior art date
Application number
PCT/US2000/042171
Other languages
French (fr)
Other versions
WO2001047171A2 (en
Inventor
Charles P Norman
Charles R Cahn
Original Assignee
Sirf Tech 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 Sirf Tech Inc filed Critical Sirf Tech Inc
Priority to AT00992803T priority Critical patent/ATE305677T1/en
Priority to JP2001547785A priority patent/JP4738692B2/en
Priority to DE60022901T priority patent/DE60022901T2/en
Priority to AU47078/01A priority patent/AU4707801A/en
Priority to EP00992803A priority patent/EP1238485B1/en
Publication of WO2001047171A2 publication Critical patent/WO2001047171A2/en
Publication of WO2001047171A3 publication Critical patent/WO2001047171A3/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
    • H04B1/7097—Interference-related aspects
    • 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
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/246—Acquisition or tracking or demodulation of signals transmitted by the system involving long acquisition integration times, extended snapshots of signals or methods specifically directed towards weak signal acquisition
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related

Abstract

A CDMA coded, spread spectrum radio signal containing a strong signal and a weak signal is received, and the interference of the strong signal with the weak signal is computed to enhance the ability to track the weak signal. The codes modulating both signals are known, and the weak signal can be predicted. The interference of the strong signal is calculated (50) as the product of the amplitude of the strong signal and the predicted crosscorrelation of the strong signal with the weak signal (40). The strong signal may be measured, predicted, or acquired through a combination of both methods (10). The crosscorrelation may be predicted for a range of weak signal values, and the weak signal selected as the prediction producing the greatest received power (60).
PCT/US2000/042171 1999-12-14 2000-11-14 Strong signal cancellation to enhance processing of weak spread spectrum signal WO2001047171A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT00992803T ATE305677T1 (en) 1999-12-14 2000-11-14 STRONG SIGNAL SUPPRESSION TO IMPROVE PROCESSING OF WEAK SPREAD SPECTRUM SIGNALS
JP2001547785A JP4738692B2 (en) 1999-12-14 2000-11-14 How to cancel a strong signal and strengthen a weak spread spectrum signal
DE60022901T DE60022901T2 (en) 1999-12-14 2000-11-14 STRONG SIGNAL SUPPRESSION TO IMPROVE THE PROCESSING OF WEAK SPREADING SPECTRUM SIGNALS
AU47078/01A AU4707801A (en) 1999-12-14 2000-11-14 Strong signal cancellation to enhance processing of weak spread spectrum signal
EP00992803A EP1238485B1 (en) 1999-12-14 2000-11-14 Strong signal cancellation to enhance processing of weak spread spectrum signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/461,123 US6282231B1 (en) 1999-12-14 1999-12-14 Strong signal cancellation to enhance processing of weak spread spectrum signal
US09/461,123 1999-12-14

Publications (2)

Publication Number Publication Date
WO2001047171A2 WO2001047171A2 (en) 2001-06-28
WO2001047171A3 true WO2001047171A3 (en) 2001-11-15

Family

ID=23831315

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/042171 WO2001047171A2 (en) 1999-12-14 2000-11-14 Strong signal cancellation to enhance processing of weak spread spectrum signal

Country Status (9)

Country Link
US (3) US6282231B1 (en)
EP (1) EP1238485B1 (en)
JP (1) JP4738692B2 (en)
KR (1) KR100676780B1 (en)
CN (1) CN1409904A (en)
AT (1) ATE305677T1 (en)
AU (1) AU4707801A (en)
DE (1) DE60022901T2 (en)
WO (1) WO2001047171A2 (en)

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