IL198482A - Method for cancelling spurious spectral components of an analogue signal generated by a device used to modulate an analogue signal from a digital modulation signal - Google Patents

Method for cancelling spurious spectral components of an analogue signal generated by a device used to modulate an analogue signal from a digital modulation signal

Info

Publication number
IL198482A
IL198482A IL198482A IL19848209A IL198482A IL 198482 A IL198482 A IL 198482A IL 198482 A IL198482 A IL 198482A IL 19848209 A IL19848209 A IL 19848209A IL 198482 A IL198482 A IL 198482A
Authority
IL
Israel
Prior art keywords
analogue signal
spectral components
modulate
device used
digital modulation
Prior art date
Application number
IL198482A
Other languages
Hebrew (he)
Other versions
IL198482A0 (en
Original Assignee
Thales Sa
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 Thales Sa filed Critical Thales Sa
Publication of IL198482A0 publication Critical patent/IL198482A0/en
Publication of IL198482A publication Critical patent/IL198482A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • H04L27/364—Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/38—Angle modulation by converting amplitude modulation to angle modulation
    • H03C3/40—Angle modulation by converting amplitude modulation to angle modulation using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/365—Modulation using digital generation of the modulated carrier (not including modulation of a digitally generated carrier)

Description

CLAIMS Method of cancelling linear and non linear spurious spectral components of an analogue signal generated by a device used to modulate an analogue signal from a digital modulation signal, the device comprising a waveform generator (2) configured to generate frequencies according to a discrete frequency comb and a monitoring receiver (22) in a closed slaving loop, the monitoring receiver comprising digital oscillators (DDS_2, DDS_3) and a frequency multiplier associate to a digital oscillator (DDS_2) in order to increase the frequency excursion of said digital oscillator (DDS_2) with its multiplicative coefficient, the digital modulation signal being slaved to the analogue signal so as to cancel spurious components present in the analogue signal, the method comprising: - a step of synchronizing the phases of the digital oscillators (DDS_2, DDS_3) of the monitoring receiver (22); the method being characterized in that it comprises for each spurious spectral component: - a step of synchronizing the phase of the waveform generator (2) and the phase of the monitoring receiver (22), so as to define a transition matrix between a measurement coordinate system and a modulation coordinate system; - a step of vectorial measuring spurious spectral components in the measurement coordinate system with the frequency multiplier associate to the digital oscillator (DDS_2); - a step of estimating spurious spectral components in the modulation coordinate system from the vectorial measuring spurious spectral components in the measurement coordinate system and of said transition matrix, - a step of establishing the cancellation coefficients of the spurious spectral component, said coefficients being egal to the spurious component in the modulation coordinate system in phase opposition.
Method according to Claim 1 , characterized in that the step of measuring spurious spectral components uses filters capable of discriminating the different spectral
IL198482A 2008-04-30 2009-04-30 Method for cancelling spurious spectral components of an analogue signal generated by a device used to modulate an analogue signal from a digital modulation signal IL198482A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0802418A FR2930857A1 (en) 2008-04-30 2008-04-30 METHOD FOR CANCELING IMPERFECTIONS OF AN ANALOGUE SIGNAL GENERATED BY A DEVICE FOR MODULATING AN ANALOGUE SIGNAL FROM A DIGITAL MODULATION SIGNAL

Publications (2)

Publication Number Publication Date
IL198482A0 IL198482A0 (en) 2010-02-17
IL198482A true IL198482A (en) 2015-01-29

Family

ID=40231897

Family Applications (1)

Application Number Title Priority Date Filing Date
IL198482A IL198482A (en) 2008-04-30 2009-04-30 Method for cancelling spurious spectral components of an analogue signal generated by a device used to modulate an analogue signal from a digital modulation signal

Country Status (5)

Country Link
EP (1) EP2114045B1 (en)
ES (1) ES2662005T3 (en)
FR (1) FR2930857A1 (en)
IL (1) IL198482A (en)
PL (1) PL2114045T3 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2352570B (en) * 1999-07-28 2003-12-24 Wireless Systems Int Ltd Distortion reduction
US7403573B2 (en) * 2003-01-15 2008-07-22 Andrew Corporation Uncorrelated adaptive predistorter
US6931343B2 (en) 2003-09-19 2005-08-16 Globespanvirata, Incorporated On-signal quadrature modulator calibration
JP4574471B2 (en) * 2004-09-17 2010-11-04 株式会社日立国際電気 Distortion compensated quadrature modulator and radio transmitter

Also Published As

Publication number Publication date
EP2114045B1 (en) 2018-01-24
ES2662005T3 (en) 2018-04-05
EP2114045A1 (en) 2009-11-04
FR2930857A1 (en) 2009-11-06
PL2114045T3 (en) 2018-05-30
IL198482A0 (en) 2010-02-17

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