WO2001008370A1 - Circuit de modulation pour la generation d'un signal a modulation de phase et d'amplitude simultanee - Google Patents

Circuit de modulation pour la generation d'un signal a modulation de phase et d'amplitude simultanee Download PDF

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Publication number
WO2001008370A1
WO2001008370A1 PCT/DE2000/001269 DE0001269W WO0108370A1 WO 2001008370 A1 WO2001008370 A1 WO 2001008370A1 DE 0001269 W DE0001269 W DE 0001269W WO 0108370 A1 WO0108370 A1 WO 0108370A1
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WO
WIPO (PCT)
Prior art keywords
stage
phase
signal
output
modulation circuit
Prior art date
Application number
PCT/DE2000/001269
Other languages
German (de)
English (en)
Inventor
Ludwig Hofmann
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP00936644A priority Critical patent/EP1197051A1/fr
Publication of WO2001008370A1 publication Critical patent/WO2001008370A1/fr

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C5/00—Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal
    • 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
    • H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation

Definitions

  • the invention relates to a modulation circuit for generating an RF signal that is simultaneously phase and amplitude modulated according to the preamble of claim 1.
  • phase shift keying or PSK phase shift keymg modulation
  • PSK phase shift keymg
  • the manipulation of frequency shift keying (FSK Frequency Shift Keymg) modulation, in which the modulation information emits a change in frequency of the carrier signal, is also detaoled. If, in the interest of high bandwidth efficiency, em is quickly used from one frequency to another switched oscillator, one obtains continuous phase changes during the transition from one symbol to another, which is why this method is called CPFSK (Contmuous Phase Frequency Shift Keymg) process is called.
  • CPFSK Contmuous Phase Frequency Shift Keymg
  • QAM quality amplitude modulation
  • Qudrature modulators As a modulator circuit for quadrature modulation methods (including the QPSK (Quadrature Phase Snift Keymg) modulation method already established in mobile radio systems), so-called Qudrature modulators are usually used, which allow the generation of frequency or phase-modulated signals with high frequency or phase accuracy ,
  • QPSK Quadrature Phase Snift Keymg
  • these modulators have a complex analog part, require the use of closely tolerated components and are only of limited suitability for a (highly) integrated design.
  • VCO voltage-controlled oscillator
  • PLL phase locked loop
  • An output signal with a constant amplitude is amplified in an output stage, which in this case can work non-linearly and is relatively simple and can be implemented with sufficient efficiency.
  • a similar concept which is also known as the "envelope curve elimination and restoration method", is used to increase the efficiency of the transmitting end stage of the satellite radio technology.
  • the object of the invention is to provide a modulation circuit of the generic type which is improved, in particular with regard to the expenditure on discrete components and from a cost point of view.
  • the invention concludes the fundamental idea of assigning separate frequency, phase and amplitude and amplitude information to a stream of data words or symbols for realizing the greatest possible digital modulation processing ar> mitio and this information in a digital phase modulator stage on the one hand and a digital amplitude signal generator stage on the other hand to process separately in the reception area of the transmission stage.
  • the major part of the technical effort for the modulation lies in the digitalization and digital processing, which, however, is known to be extremely precise and highly integrable. Components can be realized. This results in a significant reduction in the cost of discrete components and, overall, the cost.
  • the proposed modulation circuit can be referred to as a "polar actuator", since its operation based on the separate processing of phase and amplitude information can advantageously be described in a polar coordinate system.
  • this analog process is additionally connected to the output of the output stage via a power control loop.
  • an assignment memory for storing a table-like assignment rule of an input-side data bit stream m has the modulation information consisting of a sequence of phase-amplitude value pairs.
  • the signal processor stage has a calculation unit for real-time calculation of the mentioned phase-amplitude value pairs from the data bit stream on the basis of a calculation algorithm stored in an assigned program memory.
  • the phase modulator stage has a voltage-controlled oscillator which is controlled directly or indirectly (especially via a D / A converter) by means of a digital phase modulation signal.
  • the phase modulator stage comprises a frequency synthesis circuit, which in particular has a control input for a combined carrier frequency and phase modulation signal.
  • the power control loop mentioned can be designed in an advantageous embodiment for logarithmic detection and processing of the output stage output power.
  • the amplitude signal generator stage is then also for logarithmic processing Ar ⁇ plitudenmodulationssignal formed, or it is followed by a converter stage for converting a linear m eme logarithmic output characteristic.
  • This converter stage can be formed in particular from a D / A Wanoler and an amplifier with a logarithmic characteristic connected downstream of it.
  • FIG. 1 shows a schematic diagram of a transmission stage according to a first embodiment of the invention
  • FIG. 2 eme schematic diagram of a transmission stage according to a second embodiment
  • FIG. 3 em functional block diagram of a third, derived from the second embodiment (including the digital processing section).
  • FIG. 1 shows, in the form of a schematic diagram, how, according to a first embodiment of the invention, digital frequency / phase format and separate digital amplitude information for obtaining a transmission signal for supply to an antenna are processed separately.
  • the digital frequency / phase format is fed to a digital frequency modulator, the output signal of which controls a voltage-controlled oscillator VCO, the (frequency or phase modulated) output signal of which is fed as a transmission frequency signal via a first input to an output stage.
  • the digital amplitude information arrives at the input of a digital / analog converter, at the output of which it is available as analog amplitude information, which is fed to a second input of the output stage (for example for controlling the supply voltage), thus bringing it together the frequency / phase format and the amplitude information for a QAM transmit signal.
  • FIG. 2 shows the second embodiment modified compared to the second embodiment, which is distinguished by a different type of control of the output stage.
  • the output stage is preceded here by a preamplifier stage, which is referred to in the figure as "power control" and which outputs the output signal of the voltage-controlled oscillator VCO via a first input and the output signal of the digital / analog
  • Converter i.e. the analog amplitude information are supplied via a second input.
  • the provision of this additional stage enables a simpler design of the actual output stage.
  • the input of the pre-amplifier stage is via a suitable detector circuit
  • FIG. 3 shows a transmission arrangement 1 of a mobile radio terminal, which is supplied with an encoded data bit stream SIG as an input signal from the baseband (not shown) and outputs the transmission signal STX to a combined transmission / reception antenna 3.
  • the input signal SIG first arrives at the input of a modulation signal processor 5, the core of which is a table memory 5a for storing a tabular assignment between sections of the data bit stream (symbols) and
  • phase-amplitude value pairs of a modulation signal Phase-amplitude value pairs of a modulation signal.
  • Separate frequency / phase modulation signals PM and amplitude modulation signals AM are available at the output of the table memory 5a addressed with the data bit stream.
  • the frequency / phase modulation signal PM forms the input signal of a frequency synthesis circuit 7.
  • the frequency synthesis circuit 7 has the basic structure of a PLL synthesizer, which can be set extremely remotely and precisely via the digital input signal PM.
  • DDS Direct Digital Synthesizmg
  • the latter in turn is connected on the input side to the output of a voltage-controlled oscillator 7c, the output signal thereof
  • OSC also forms the output signal of the frequency synthesis circuit 7.
  • the output of DDS circuit 7a abuts the em Syn ⁇ synthesis signal SYN is connected to a first input of a phase comparing circuit 7d, 7e on the other input a reference oscillator with a reference signal REF supplied is.
  • the reference oscillator 7e in the form of a quartz oscillator supplies a reference signal with a constant frequency, the phase position of which is compared to that of the synthesis signal SYN from the DDS circuit 7a.
  • the tuning signal TUN thus reflects the result of this comparison, so that (after the low-pass filtering) the control voltage reflecting the comparison result is also supplied to the voltage-controlled oscillator.
  • the output signal OSC is sinusoidal and serves directly as a transmission frequency signal; in the case of the formation of the voltage-controlled oscillator 7c for the output of a rectangular pulse signal, the clock shaping circuit 7b would be dispensable.
  • the transmission frequency signal OSC is phase-locked, but is connected to the reference signal REF with a frequency that can be set via the DDS circuit 7a.
  • the digital amplitude modulation signal AM is first a D / A converter 9 is ready for conversion loga ⁇ thmêts m em analog Amplitu ⁇ denmodulationssignal and then supplied to a strong Klemsignalver- 11 with a logarithmic characteristic, em at the output amplitude modulation signal LAM.
  • the signal LAM is fed to a control input of a power control stage 13, whose power-controlled output signal is fed to the transmission output stage 15 and, after amplification m, forms the transmission signal STX.
  • Em part of the end signal STX is diverted (via a directional coupler not shown) to a power detector 17 whose output signal together with the signal LDS LAM to Steue ⁇ tion of the transmission power control stage 13 is used.
  • a merging of the phase and amplitude modulation branch into a phase modulation with a non-constant envelope curve and also a power control of the transmission output stage are realized.
  • the embodiment of the invention is not limited to the described embodiments, but is also possible in m different combinations as well as in a multitude of modifications which are within the scope of professional action.
  • a calculation unit for real-time calculation of the separate frequency / phase and amplitude modulation signals can be used, which accesses a calculation algorithm stored in an assigned program memory.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

L'invention concerne un circuit de modulation (1) servant à générer un signal haute fréquence à modulation de phase et d'amplitude simultanée, en particulier un signal haute fréquence MAQ, et comportant un étage modulateur de phase numérique (7) suivi d'un étage final (15) relié à la sortie de l'étage modulateur de phase directement par une première entrée ou bien par l'intermédiaire d'un étage de commande de puissance (13). Le circuit selon l'invention est caractérisé en ce qu'un étage numérique générateur de signaux d'amplitude (5, 13), séparé de l'étage modulateur de phase, est relié côté sortie au moins indirectement à une deuxième entrée de l'étage final ou à l'étage de commande de puissance.
PCT/DE2000/001269 1999-07-21 2000-04-25 Circuit de modulation pour la generation d'un signal a modulation de phase et d'amplitude simultanee WO2001008370A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00936644A EP1197051A1 (fr) 1999-07-21 2000-04-25 Circuit de modulation pour la generation d'un signal a modulation de phase et d'amplitude simultanee

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934181 1999-07-21
DE19934181.8 1999-07-21

Publications (1)

Publication Number Publication Date
WO2001008370A1 true WO2001008370A1 (fr) 2001-02-01

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PCT/DE2000/001269 WO2001008370A1 (fr) 1999-07-21 2000-04-25 Circuit de modulation pour la generation d'un signal a modulation de phase et d'amplitude simultanee

Country Status (2)

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EP (1) EP1197051A1 (fr)
WO (1) WO2001008370A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209873A1 (fr) * 2000-11-21 2002-05-29 Koninklijke Philips Electronics N.V. Procédé et apparaeil pour le transmission de signaux modulés en phase et en amplitude
EP1255390A1 (fr) * 2001-10-18 2002-11-06 Siemens Aktiengesellschaft Methode et appareil de communication mobile à modes multiples
EP2019485A3 (fr) * 2001-03-21 2009-08-05 Skyworks Solutions, Inc. Système de contrôle d'un amplificateur de classe D
US7696826B2 (en) 2006-12-04 2010-04-13 Skyworks Solutions, Inc. Temperature compensation of collector-voltage control RF amplifiers

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4385400A (en) * 1980-04-24 1983-05-24 Rca Corporation Automatic gain control arrangement useful in an FM radio receiver
US5430416A (en) * 1994-02-23 1995-07-04 Motorola Power amplifier having nested amplitude modulation controller and phase modulation controller
US5450044A (en) * 1993-04-14 1995-09-12 Acrodyne Industries, Inc. Quadrature amplitude modulator including a digital amplitude modulator as a component thereof
US5469127A (en) * 1992-08-04 1995-11-21 Acrodyne Industries, Inc. Amplification apparatus and method including modulator component
WO1999014849A1 (fr) * 1997-09-12 1999-03-25 Siemens Aktiengesellschaft Circuit pour produire un signal module
WO1999029074A1 (fr) * 1997-11-26 1999-06-10 Siemens Aktiengesellschaft Circuiterie pour produire un signal module
EP0998088A2 (fr) * 1998-10-27 2000-05-03 Nokia Mobile Phones Ltd. Modulateur à étages séparés de modulation en phase et en amplitude
WO2000030245A1 (fr) * 1998-11-18 2000-05-25 Ericsson Inc. Circuit et procede de modulation i/q avec modulation d'amplitude independante, tres efficace
EP1035701A1 (fr) * 1999-03-08 2000-09-13 Motorola, Inc. Modulateur employant l'élimination et la restauration de l'enveloppe à tables de consultation

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4385400A (en) * 1980-04-24 1983-05-24 Rca Corporation Automatic gain control arrangement useful in an FM radio receiver
US5469127A (en) * 1992-08-04 1995-11-21 Acrodyne Industries, Inc. Amplification apparatus and method including modulator component
US5450044A (en) * 1993-04-14 1995-09-12 Acrodyne Industries, Inc. Quadrature amplitude modulator including a digital amplitude modulator as a component thereof
US5430416A (en) * 1994-02-23 1995-07-04 Motorola Power amplifier having nested amplitude modulation controller and phase modulation controller
WO1999014849A1 (fr) * 1997-09-12 1999-03-25 Siemens Aktiengesellschaft Circuit pour produire un signal module
WO1999029074A1 (fr) * 1997-11-26 1999-06-10 Siemens Aktiengesellschaft Circuiterie pour produire un signal module
EP0998088A2 (fr) * 1998-10-27 2000-05-03 Nokia Mobile Phones Ltd. Modulateur à étages séparés de modulation en phase et en amplitude
WO2000030245A1 (fr) * 1998-11-18 2000-05-25 Ericsson Inc. Circuit et procede de modulation i/q avec modulation d'amplitude independante, tres efficace
EP1035701A1 (fr) * 1999-03-08 2000-09-13 Motorola, Inc. Modulateur employant l'élimination et la restauration de l'enveloppe à tables de consultation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209873A1 (fr) * 2000-11-21 2002-05-29 Koninklijke Philips Electronics N.V. Procédé et apparaeil pour le transmission de signaux modulés en phase et en amplitude
EP2019485A3 (fr) * 2001-03-21 2009-08-05 Skyworks Solutions, Inc. Système de contrôle d'un amplificateur de classe D
EP1255390A1 (fr) * 2001-10-18 2002-11-06 Siemens Aktiengesellschaft Methode et appareil de communication mobile à modes multiples
US7696826B2 (en) 2006-12-04 2010-04-13 Skyworks Solutions, Inc. Temperature compensation of collector-voltage control RF amplifiers

Also Published As

Publication number Publication date
EP1197051A1 (fr) 2002-04-17

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