AR017635A1 - A MODULATION PROVISION, DOUBLE MODE, FOR A FIRST AND SECOND BANDWIDTH SIGNAL BETTER THAN THE FIRST SIGNAL, A RADIOTELEFONOQUE INCORPORATES SUCH MODULATION PROVISION, AND A DOUBLE MODE MODULATION METHOD, WHICH USE - Google Patents

A MODULATION PROVISION, DOUBLE MODE, FOR A FIRST AND SECOND BANDWIDTH SIGNAL BETTER THAN THE FIRST SIGNAL, A RADIOTELEFONOQUE INCORPORATES SUCH MODULATION PROVISION, AND A DOUBLE MODE MODULATION METHOD, WHICH USE

Info

Publication number
AR017635A1
AR017635A1 ARP980105815A ARP980105815A AR017635A1 AR 017635 A1 AR017635 A1 AR 017635A1 AR P980105815 A ARP980105815 A AR P980105815A AR P980105815 A ARP980105815 A AR P980105815A AR 017635 A1 AR017635 A1 AR 017635A1
Authority
AR
Argentina
Prior art keywords
signal
modulation
narrow bandwidth
provision
oversampled
Prior art date
Application number
ARP980105815A
Other languages
Spanish (es)
Original Assignee
Ilarregui Juan Martin
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 US08/971,502 external-priority patent/US6137826A/en
Priority claimed from US09/151,622 external-priority patent/US6100827A/en
Application filed by Ilarregui Juan Martin filed Critical Ilarregui Juan Martin
Publication of AR017635A1 publication Critical patent/AR017635A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems

Abstract

Una disposicion de modulacion, de modo doble para una primera senal y una segunda senal de ancho de banda más angosto que la primera senal que permitemodular una senal de ancho de banda angosto, tal como una senal FM de banda angosta, en un moduladorque modula una senal de ancho de banda ancho, talcomo una senal CDMA, mediante el sobremuestreo de la senal de ancho de banda angosto y la aplicacion de dicha senal sobremuestreada de ancho debanda angosto al modulador. Al sobremuestrear la senal deancho de banda angosto, es posible utilizar el mismo filtro pasabajos fijo tanto para la senalde ancho de banda ancho como para la senal sobremuestreada de ancho de banda angosto. En consecuencia, no resultan necesarios distintos filtros pasabajosnifiltros pasabajos conmutados. La invencion también propone un radioteléfono que incorpora dicha disposicion y que comprende medios para modular unasenal en una portadora, para generar una primera senal y aplicar la misma a medios de modulacion que generan una segunda senal de ancho de banda más angostoque es sobremuestreada y aplicada a los medios de modulacion. También se propone un método de modulacion, de modo doble, que utiliza dicha disposicionque consiste en aplicar una senal de ancho debanda angosta a un modulador para sobremuestrear la misma y modular la senal sobremuestreada. Se modulauna senal de ancho de banda angosto, tal como una senal FM de banda angosta, en un modulador que modula una senal de ancho de banda ancho, tal comounasenal CDMA, mediante el sobremuestreo de la senal de ancho de banda angosto y la aplicacion de dicha senal sobremuestreada de ancho de banda angosto almodulador. Al sobremuestrear la senal de ancho de banda angosto, es posible utilizar el mismo filtro pasabajos fijo tanto para la senal de ancho de banda anchocomo para la senal sobremuestreada de ancho de banda angosto. En consecuencia, no resultan necesarios distintos filtros pasabajos ni filtros pasabajosconmutados.A modulation arrangement, double for a first signal and a second signal of narrower bandwidth than the first signal that allows modulating a narrow bandwidth signal, such as a narrowband FM signal, in a modulator that modulates a Wide bandwidth signal, such as a CDMA signal, by oversampling the narrow bandwidth signal and applying said oversampled signal of narrow bandwidth to the modulator. By oversampling the narrow bandwidth signal, it is possible to use the same fixed low pass filter for both the wide bandwidth signal and the oversampled narrow bandwidth signal. Consequently, different low pass filters and switched low pass filters are not necessary. The invention also proposes a radiotelephone incorporating said arrangement and comprising means to modulate a channel in a carrier, to generate a first signal and apply it to modulation means that generate a second signal of narrower bandwidth that is oversampled and applied to the means of modulation. A method of modulation is also proposed, in a double way, that uses said arrangement which consists in applying a narrow bandwidth signal to a modulator to oversample it and modulate the oversampled signal. A narrow bandwidth signal is modulated, such as a narrowband FM signal, in a modulator that modulates a wide bandwidth signal, such as a CDMA signal, by oversampling the narrow bandwidth signal and applying said oversampled signal of narrow bandwidth almodulator. By oversampling the narrow bandwidth signal, it is possible to use the same fixed low pass filter for both the wide bandwidth signal and the oversampled narrow bandwidth signal. Consequently, different low pass filters or switched low pass filters are not necessary.

ARP980105815A 1997-11-17 1998-11-17 A MODULATION PROVISION, DOUBLE MODE, FOR A FIRST AND SECOND BANDWIDTH SIGNAL BETTER THAN THE FIRST SIGNAL, A RADIOTELEFONOQUE INCORPORATES SUCH MODULATION PROVISION, AND A DOUBLE MODE MODULATION METHOD, WHICH USE AR017635A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/971,502 US6137826A (en) 1997-11-17 1997-11-17 Dual-mode modulation systems and methods including oversampling of narrow bandwidth signals
US09/151,622 US6100827A (en) 1998-09-11 1998-09-11 Modulation systems and methods that compensate for DC offset introduced by the digital-to-analog converter and/or the low pass filter thereof
US09/151,996 US6535561B2 (en) 1997-11-17 1998-09-11 Dual-mode modulation systems and methods including oversampling of narrow bandwidth signals and DC offset compensation

Publications (1)

Publication Number Publication Date
AR017635A1 true AR017635A1 (en) 2001-09-12

Family

ID=45606351

Family Applications (1)

Application Number Title Priority Date Filing Date
ARP980105815A AR017635A1 (en) 1997-11-17 1998-11-17 A MODULATION PROVISION, DOUBLE MODE, FOR A FIRST AND SECOND BANDWIDTH SIGNAL BETTER THAN THE FIRST SIGNAL, A RADIOTELEFONOQUE INCORPORATES SUCH MODULATION PROVISION, AND A DOUBLE MODE MODULATION METHOD, WHICH USE

Country Status (3)

Country Link
KR (1) KR100626960B1 (en)
AR (1) AR017635A1 (en)
MY (1) MY116780A (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI96811C (en) * 1993-11-30 1996-08-26 Nokia Mobile Phones Ltd Method and circuitry for compensating the DC offset voltage in a D / A converter
TW294867B (en) * 1994-12-23 1997-01-01 Qualcomm Inc

Also Published As

Publication number Publication date
KR100626960B1 (en) 2006-09-26
MY116780A (en) 2004-03-31
KR20010052106A (en) 2001-06-25

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