WO2003063370A1 - Procede et dispositif permettant de generer un signal porteur multiple haute frequence - Google Patents

Procede et dispositif permettant de generer un signal porteur multiple haute frequence Download PDF

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Publication number
WO2003063370A1
WO2003063370A1 PCT/DE2003/000132 DE0300132W WO03063370A1 WO 2003063370 A1 WO2003063370 A1 WO 2003063370A1 DE 0300132 W DE0300132 W DE 0300132W WO 03063370 A1 WO03063370 A1 WO 03063370A1
Authority
WO
WIPO (PCT)
Prior art keywords
carrier
frequency
circuit arrangement
signal
combiner
Prior art date
Application number
PCT/DE2003/000132
Other languages
German (de)
English (en)
Inventor
Janos Gila
Olaf Albert
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 CA002474361A priority Critical patent/CA2474361A1/fr
Priority to EP03704230A priority patent/EP1468500A1/fr
Publication of WO2003063370A1 publication Critical patent/WO2003063370A1/fr
Priority to US10/898,591 priority patent/US20050107049A1/en

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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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0483—Transmitters with multiple parallel paths

Definitions

  • the invention relates to a method and a circuit arrangement for generating a high-frequency multi-carrier signal from at least two carrier signals, each with a carrier frequency.
  • the invention further relates to a read / write device with the circuit arrangement and an identification system with at least one read / write device and at least one mobile data memory.
  • Identification systems are known as prior art which contain one or more stationary read / write devices which exchange data with mobile data memories in a contactless manner via a radio transmission-based data transmission link.
  • Systems of this type are used in technical facilities in which a large number of objects or goods have to be moved as quickly and freely as possible.
  • the objects can be of various types, e.g. Parcels in a shipping facility, assembly parts in a production facility, luggage in a transport system and much more.
  • the draft standard provides for the write / read reader to query for the presence of a mobile data memory in the detection area.
  • the read / write device sends out an unmodulated first carrier signal with a fixed carrier frequency, for example with a frequency of 2.45 GHz.
  • This carrier signal can passively from a mobile data memory located in the reception area, for example through so-called "back scattering" are sent back to the read / write device.
  • the mobile data memory modulates the impedance of a transmit / receive antenna integrated in the mobile data memory in cyclic sequences with a significant recognition sequence for identifying the mobile data memory in a read / write device. If the first carrier signal that has been sent back and modulated with the recognition sequence can be received by the read / write device and has been recognized as valid, then this creates another carrier signal. When the second carrier signal is applied, the write / read reader t signals the mobile data memory that a data transmission will follow. The second carrier signal is therefore modulated for data transmission. This carrier signal is from the mobile
  • Data storage is queried cyclically and at short intervals for existence. If this is the case, the mobile data storage device can switch on the data receiver for the subsequent data transmission.
  • the frequency of the second carrier signal is advantageously shifted from the first carrier frequency by a fixed frequency amount.
  • a standard frequency spacing of 10.6496 MHz is proposed.
  • the signal generation of the two carrier signals with such a small carrier frequency spacing of approximately 10.7 MHz at a carrier frequency of approximately 2.45 GHz is, however, technically complex.
  • ISM frequency band to take into account the relevant radio regulations.
  • These may require a minimum attenuation of the frequency ranges adjoining the two carrier frequencies in order to avoid interference with useful signals.
  • a common value for this minimum attenuation is e.g. 40 dB or - based on the maximum absolute power output - e.g. a value of -30 dBm.
  • the individual high-frequency carrier frequencies are each generated by a signal generator. creates and combined by means of an RF combiner or RF divider known for example from microwave technology or satellite technology to form a multiple carrier signal.
  • the multiple carrier signal is then amplified to the necessary output power by a power amplifier and fed to an antenna for radiation.
  • the multiple carrier signal can also be fed into a transmission line, such as a coaxial line.
  • intermodulation frequency components As a rule, when using conventional RF amplifiers in the known circuit arrangement, high-frequency interference frequency components would occur in the amplified multiple carrier signal. This would be the case in particular if the individual carrier frequencies in the frequency spectrum were particularly “close to 1 ” 1 .
  • the cause of these interference frequency components which are referred to below as intermodulation frequency components, is the non-ideal transmission behavior of the RF amplifiers used. Although these intermodulation frequency components can be significantly reduced by using technically high-quality, that is to say in particular highly linear, RF amplifiers, this is complex and cost-intensive. In addition, the use of the highly linear RF amplifiers results in high power consumption with appropriate heat development and a large space requirement.
  • the object of the invention is to provide a circuit arrangement for generating a high-frequency multi-carrier signal, which allows the use of less high-quality circuit components and the elimination of any downstream HF filter measures.
  • Another object is to provide a circuit arrangement with a reduced space and current requirement.
  • the object of the invention is achieved with a method for generating a high-frequency multi-carrier signal from at least two carrier signals, each with a carrier frequency, the carrier signals generated being amplified separately at the high-frequency level and then combined to form the multi-carrier signal.
  • the carrier signals can be generated in such a way that the respective carrier frequencies have a predeterminable frequency spacing from one another. A ratio of the frequency spacing to an adjacent carrier frequency of less than 1: 100 can be specified.
  • the carrier signals can also be generated in such a way that at least one carrier frequency has at least one side band. Carrier frequencies of at least 300 MHz can also be generated.
  • the method can be operated in an ISM frequency band of 2.45 GHz, 5.6 GHz or in a UHF frequency band of the ISM frequency band.
  • the object is further achieved with a circuit arrangement for generating a high-frequency multiple carrier signal from at least two carrier signals, each with a carrier frequency.
  • This has, in each case a signal generator for generating the carrier signals, in each case an RF amplifier which is connected downstream of the respective signal generator, and an HF combiner for forming the multi-carrier signal at a signal output which is connected downstream of the RF amplifiers.
  • the signal generators can be set so that the respective carrier frequencies have a predeterminable frequency spacing from one another. The ratio of the predeterminable frequency spacing to an adjacent carrier frequency can be less than 1: 100.
  • the signal generators can also be set such that at least one carrier frequency has at least one side band.
  • the RF amplifiers and the RF combiner have electrical characteristics which are matched to one another in such a way that intermodulation frequency components have a minimum attenuation when the multicarrier signal is formed compared to the carrier frequencies.
  • a nonlinearity or a distortion factor of an RF amplifier can serve as a tunable electrical characteristic value.
  • a common mode suppression of the inputs of the HF combiner can serve as a tunable electrical characteristic.
  • the minimum attenuation can be 40 dB or, based on the maximum absolute power output, -30 dBm.
  • the carrier frequencies generated by the signal generators can be at least 300 MHz.
  • the HF combiner can be a Wilkinson
  • the circuit arrangement can be operated in an ISM frequency band of 2.45 GHz, 5.6 GHz or in a UHF frequency band of the ISM frequency band.
  • the object is achieved with a write / read reader t for data transmission with at least one mobile data memory which has the circuit arrangement.
  • the object is achieved with an identification system with at least one such write / read reader and with at least one mobile data memory.
  • the identification system can be based on an ISOZIEC 18000 standard.
  • FIG. 1 shows an example of the construction of an identification system with a write / read reader and with three mobile data memories according to the invention
  • FIG. 2 shows an example of a circuit arrangement according to the invention for generating a multi-carrier signal
  • FIG 3-5 exemplary frequency spectra of the carrier signals and the multi-carrier signal generated.
  • FIG. 1 shows an example of the construction of an identification system IDS with a stationary write / read reader SLG according to the invention, which exchanges data with three mobile data memories DT1-DT3 by way of example.
  • the write / read reader SLG and the mobile data memories DT1-DT3 have suitable transmit / receive antennas ANT, SEA for sending and receiving the data.
  • the circuit arrangement SA according to the invention which is connected to the transmit / receive antenna ANT for data transmission, can also be seen as part of the write / read reader SLG.
  • FIG. 2 shows an example of a circuit arrangement SA according to the invention for generating a multicarrier signal TS with two RF amplifiers VI, V2 and an RF combiner HF.
  • Known HF combiners HF are e.g. the Wilkinson divider or the branch line divider.
  • G1, G2 e.g. Quartz oscillators or RF synthesizers, which are used to generate a carrier signal S1, S2, each with a carrier frequency fl, f2.
  • each carrier signal S1, S2 is separately amplified to the desired power by means of a downstream RF amplifier VI, V2 before it is fed to an HF combiner HF.
  • the downstream HF combiner HF has an input E1, E2 for combining the amplified carrier signals VS1, VS2.
  • the merged multiple carrier signal TS is available at a signal output A of the HF combiner HF. As in the example in FIG. 2, this can then be used to feed the transmit / receive antenna ANT.
  • the reason for this is in particular the non-linearity EK1 of the RF amplifier or the distortion factor EK2 as a technical characteristic of the RF amplifier.
  • the inter odulation Frequency components arise at discrete points in the frequency spectrum of the multicarrier signal and have high interference levels there. Starting from the two carrier frequencies fl, f2, these then appear more damped in the same carrier frequency spacing dF for increasing and decreasing frequencies (see FIG. 5). The level of the interference levels of the intermodulation frequency components is lower, the lower the non-linearity EK1 or the harmonic distortion EK2 of the RF amplifier used.
  • Intermodulation frequency components can consequently only arise in the HF combiner HF by intermodulation of the amplified carrier signals VS1, VS2 present at the inputs E1, E2.
  • a signal separation at the inputs E1, E2 on the HF combiner is decisive for a possible generation.
  • infinite signal separation cannot be achieved, so that HF intermodulation frequency components would also appear in the HF combiner.
  • compliance with the component tolerances of the ohmic characteristic impedance and the accuracy of the geometrical dimensions of the waveguides is decisive. These determine the quality of the signal separation or the common mode rejection EK3 as a technical characteristic value EK3 of the signals at the input E1, E2. Compliance with the above tolerances can be achieved with relatively little effort.
  • FIG. 3-5 show exemplary frequency spectra F1, F2, FV1, FV2, FA of the above-described carrier signals S1, S2 and the generated multiple carrier signal TS for better understanding.
  • the respective carrier frequencies fl, f2 are entered with the corresponding signal levels P1, P2 of the carrier frequencies fl, f2, the carrier frequency fl additionally having side bands SB1, SB2 due to data modulation.
  • the abscissa provided with the reference symbol f represents the frequency
  • the ordinate provided with the reference symbol p represents the level of the respective signals S1, S2, TS.
  • FIG. 3 shows the frequency spectrum F1, FV1 of the carrier signal SI generated by the signal generator Gl as an example, and the amplified carrier signal VS1. Because there is no possibility of intermodulation with the carrier frequency f2, the frequency spectra F1, FV1 are almost identical. Because of this, the two frequency spectra F1, FV1 are shown in a common figure.
  • FIG. 4 represents the frequency spectrum F2, FV2 of the carrier signal S2 and the amplified carrier signal VS2 analogously to the carrier signal SI, with no data modulation taking place.
  • FIG. 5 shows an example of the frequency spectrum FA of the output signal A of the HF combiner HF after combining the two amplified carrier signals VS1, VS2 to form the multiple carrier signal TS.
  • the carrier frequencies fl, f2 already described at the beginning with the carrier frequency spacing dF and the intermodulation frequency components 2f2-f1, 2fl-f2, .. can be seen as decreasing continuations in both directions of the abscissa f.
  • the interference levels P3, P4, P7, P8 of the intermodulation frequency components 2f2-f1, 2fl-f2,... are shown by dashed lines for a circuit arrangement according to the prior art. It can be seen that the exemplary interference levels P3, P4 are not sufficiently attenuated with respect to the two carrier frequencies fl, f2. Further HF filter measures would be necessary here.
  • the intermodulation frequency components 2f2-fl, 2fl-f2, .. when using the circuit arrangement according to the invention advantageously have lower interference levels P5, P ⁇ at the same frequencies. It can be seen that the interference levels P5, P6 have a greater attenuation than the required minimum attenuation GW compared to the two carrier frequencies fl, f2.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

L'invention se rapporte à un procédé et à un circuit (SA) permettant de générer un signal porteur multiple haute fréquence (TS) à partir de deux signaux porteurs (S1, S2) présentant respectivement une fréquence porteuse (f1, f2). L'invention concerne également un dispositif d'écriture/de lecture (SLG) comprenant ledit circuit ainsi qu'un système d'identification (IDS) comportant au moins un dispositif d'écriture/de lecture et une mémoire de données mobiles (DT1-DT3). Ainsi, l'un des avantages de l'invention réside dans le fait qu'il n'est plus nécessaire de faire appel à des amplificateurs HF (V1, V2) onéreux, à linéarité élevée et qui de surcroît présentent une consommation de courant importante et dégagent une quantité élevée de chaleur, pour obtenir une atténuation minimale (GW) suffisamment grande entre les fréquences porteuses et les composantes de fréquence d'intermodulation adjacentes (2f2-f1, 2f1-f2, ) du signal porteur multiple. De manière avantageuse, l'invention permet en outre d'augmenter la fiabilité et la durée de vie dudit circuit et rend inutile l'utilisation d'un filtre RF onéreux et placé en aval.
PCT/DE2003/000132 2002-01-25 2003-01-17 Procede et dispositif permettant de generer un signal porteur multiple haute frequence WO2003063370A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002474361A CA2474361A1 (fr) 2002-01-25 2003-01-17 Procede et dispositif permettant de generer un signal porteur multiple haute frequence
EP03704230A EP1468500A1 (fr) 2002-01-25 2003-01-17 Procede et dispositif permettant de generer un signal porteur multiple haute frequence
US10/898,591 US20050107049A1 (en) 2002-01-25 2004-07-26 Method and device for generating a high frequency multi-carrier signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10202900.8 2002-01-25
DE10202900 2002-01-25

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/898,591 Continuation US20050107049A1 (en) 2002-01-25 2004-07-26 Method and device for generating a high frequency multi-carrier signal

Publications (1)

Publication Number Publication Date
WO2003063370A1 true WO2003063370A1 (fr) 2003-07-31

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PCT/DE2003/000132 WO2003063370A1 (fr) 2002-01-25 2003-01-17 Procede et dispositif permettant de generer un signal porteur multiple haute frequence

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EP (1) EP1468500A1 (fr)
CA (1) CA2474361A1 (fr)
WO (1) WO2003063370A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0789253A2 (fr) * 1992-11-18 1997-08-13 Btg International Limited Détection de plusieurs articles
WO1997041642A1 (fr) * 1996-04-29 1997-11-06 Radio Design Innovation Ab Dispositif a combineurs emetteurs
US6049707A (en) * 1997-09-02 2000-04-11 Motorola, Inc. Broadband multicarrier amplifier system and method using envelope elimination and restoration

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0789253A2 (fr) * 1992-11-18 1997-08-13 Btg International Limited Détection de plusieurs articles
WO1997041642A1 (fr) * 1996-04-29 1997-11-06 Radio Design Innovation Ab Dispositif a combineurs emetteurs
US6049707A (en) * 1997-09-02 2000-04-11 Motorola, Inc. Broadband multicarrier amplifier system and method using envelope elimination and restoration

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VANKKA J ET AL: "A MULTICARRIER QAM MODULATOR", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II: ANALOG AND DIGITAL SIGNAL PROCESSING, IEEE INC. NEW YORK, US, vol. 47, no. 1, January 2000 (2000-01-01), pages 1 - 10, XP000951710, ISSN: 1057-7130 *

Also Published As

Publication number Publication date
EP1468500A1 (fr) 2004-10-20
CA2474361A1 (fr) 2003-07-31

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