WO2003036849A1 - Modulation a porteuse multiple dependant de la vitesse - Google Patents

Modulation a porteuse multiple dependant de la vitesse Download PDF

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Publication number
WO2003036849A1
WO2003036849A1 PCT/DE2001/003728 DE0103728W WO03036849A1 WO 2003036849 A1 WO2003036849 A1 WO 2003036849A1 DE 0103728 W DE0103728 W DE 0103728W WO 03036849 A1 WO03036849 A1 WO 03036849A1
Authority
WO
WIPO (PCT)
Prior art keywords
subcarriers
frequency spacing
speed
received signal
frequency
Prior art date
Application number
PCT/DE2001/003728
Other languages
German (de)
English (en)
Inventor
Edgar Bolinth
Ralf Kern
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 PCT/DE2001/003728 priority Critical patent/WO2003036849A1/fr
Publication of WO2003036849A1 publication Critical patent/WO2003036849A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/26035—Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences

Definitions

  • the present invention relates to an apparatus and a method for transmitting data by modulating data to be transmitted by means of multi-carrier modulation, the subcarriers being at a certain frequency spacing from one another. Furthermore, the present invention relates to a method and a device for receiving data by receiving a received signal modulated by means of multicarrier modulation and demodulating the same.
  • a typical multi-carrier method is OFDM transmission technology, in which several orthogonal subcarriers are individually modulated and combined to form a sum signal.
  • the data stream is evenly distributed over the subcarriers arranged equidistantly on the frequency axis.
  • the spectrum of the individual carriers preferably corresponds to an SI function.
  • Mobile devices can move at different speeds relative to a base station. In any case, however, a high transmission quality and / or a high data rate during transmission should be guaranteed.
  • the movement of the mobile devices leads to speed-dependent frequency shifts due to the Doppler effect. This leads to a broadening of the spectrum (Jakes spectrum) of the individual sub or subcarriers, so that inter-carrier interference occurs.
  • the demodulated received signals are particularly disturbed at high speeds of the mobile devices.
  • the object of the present invention is therefore to propose a method and a device for sending or receiving data in which an undisturbed data transmission is possible even at high speeds of the mobile terminals.
  • this object is achieved by a method for transmitting data by modulating data to be transmitted by means of multicarrier modulation, subcarriers being spaced apart from one another, transmitting the modulated data, detecting a speed between a mobile terminal and a base station and adapting the frequency spacing to the speed ,
  • the stated object is achieved by a method for receiving data by receiving a received signal modulated by means of multi-carrier modulation, demodulating the received signal and detecting a frequency spacing from subcarriers, the received signal being demodulated taking into account the frequency spacing.
  • the frequency spacing of the subcarriers can advantageously be adapted to the individual speed of a mobile terminal device, so that the subcarriers can be spaced apart at high relative speeds to such an extent that there is essentially no longer any inter-carrier interference.
  • 1 shows a schematic diagram of a base station according to the invention, towards which a mobile terminal is moving;
  • 2 shows a carrier frequency line spectrum for a low relative speed between a base station and a mobile terminal;
  • FIG. 4 shows a carrier frequency line spectrum according to the invention for different speeds between several mobile terminals and the base station.
  • Fig. 1 shows a schematic diagram of a base station BS according to the invention, to which a mobile terminal MT moves at a speed v.
  • the base station BS comprises a reception device ⁇ E, with which the signals of the mobile terminal MT can be received.
  • the received signals are forwarded to a transit time measuring device L, so that the speed at which the mobile terminal MT moves toward the base station BS can be detected.
  • a modulation device M in which the data to be transmitted is modulated is controlled with the detected speed variable.
  • Subcarriers whose line spacing depends on the transit time t of the signal from the mobile station MT to the base station BS can thus be used in the modulation.
  • the modulated data are finally fed to a transmission device.
  • FIG. 2 shows a line spectrum for a multicarrier transmission method, which contains the equidistant lines of the individual subcarriers.
  • the lines are typically to be folded with an S1 spectral function, not shown.
  • the distance between the lines ⁇ fl is to be selected so that the individual subcarriers are orthogonal to one another.
  • the transmitted signals are reflected in a further transmission path, for example on a wall from which the mobile terminal MT is moving, the frequency of the received signals is shifted both positively and negatively, as a result of which the entire spectrum of each Subcarrier moves and expands.
  • the lines of the subcarrier frequencies are spaced such that broadening of the spectra does not play a role up to a certain speed of the mobile terminals MT. If, however, the speed of a mobile terminal MT increases to a certain extent, the spectrum is broadened, which leads to disruptive inter-carrier interference.
  • the distance between the subcarrier frequency lines is therefore adapted to the speed v of one or more mobile terminals MT. This adaptation should preferably be carried out while maintaining the orthogonality of the individual subcarriers with the aid of a suitable set of orthogonal functions.
  • Orthogonal functions are understood to mean the combination (convolution) of the pure subcarrier frequency (Dirac collision in the frequency range) and a suitable subcarrier spectral function (SI, SI 2 function, etc.).
  • both the base station BS and the mobile terminals MT have transmit and receive functions, it is fundamentally advantageous if a carrier frequency adaptation is carried out both in the base station BS and in the terminals MT. see is.
  • the equipment adaptation is carried out on the transmission side both in the base station BS and in the mobile station.
  • more hardware effort can be operated in the base station BS, for. B. by supporting 1024 subcarriers, whereas in the mobile station for reasons of complexity or cost comparatively fewer subcarriers, e.g. B. 64, are supported.
  • a prerequisite for adapting the frequency spacings of the subcarriers is that the relative speed of one or more terminal devices MT to the base station BS is known.
  • the coordinates of a terminal MT can be determined by two base stations BS. If the coordinates are determined several times, the speed of the terminal MT can be determined.
  • runtime measurements can be used to determine at least speed components both in the terminal MT and in the base station BS.
  • Another option for determining speed would be the use of navigation systems such as GPS or Galileo in the future.
  • a table can be used to convert the determined speed v into a carrier pattern.
  • the determined speed v can thus be assigned to a speed class via which a frequency spacing or a carrier pattern can be determined by means of a stored table in the base station BS or in the terminal MT.
  • the receiver must know the subcarrier frequency spacing for demodulation. To this end, there is the possibility that the transmitter will find out the subcarrier frequency spacing or determine it itself.
  • the frequency spacing can be determined by Fast Fourier Transform (FFT) and subsequent line detection. Since the equipment required for this can be relatively high, the external automatic subsequent line detection is usually carried out in the base station BS.
  • FFT Fast Fourier Transform
  • the receiver is preferably informed of the subcarrier frequency spacing in header sections of the transmission signals. So that the receiver can demodulate the header sections, these must be modulated with fixed subcarrier frequency spacings that are known to the receiver in advance. The receiver is therefore able to read the frequency spacing used for modulating the data from a header.
  • a further development according to the invention in particular for the downlink, in which data is transmitted from the base station BS to the mobile terminal MT, individual groups of subcarriers, each of which is assigned to a specific mobile terminal, can be adapted individually.
  • Fig. 4 shows such a situation.
  • the terminals or mobile terminals MT1, MT2, MT3 and MT4 move at different speeds relative to the base station.
  • the example according to FIG. 4 is chosen such that the terminals MT1 and MT3 are to be classified in the same speed class.
  • the terminals MT2 and MT4 are also assigned to a speed class.
  • the carrier frequency spacing for transmission to the terminals MT1 and MT3 is ⁇ fl
  • the frequency spacing for data transmission to the terminals MT2 and MT4 is ⁇ f2 due to their higher relative speed.
  • the choice of the frequency spacings is basically arbitrary and is not limited to the use of a multiple of a basic spacing chosen in the examples. Alternatively, it can also be provided that a frequency spacing is selected for all terminals that is sufficient for the terminal with the highest relative speed. With quality restrictions, a medium frequency spacing can of course also be selected for all end devices if individual adaptation to the individual end devices is not possible or desired.
  • MT, MTl, MT2, MT3 and MT4 end devices or mobile terminals t runtime v speed

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

En raison de l'effet Doppler, des bruits de transmission peuvent survenir entre une station de base et un terminal mobile (MT1, MT2, MT3, MT4), lorsque ce dernier se déplace à une vitesse relative relativement élevée par rapport à la station de base. Pour des techniques de transmission à modulation à porteuse multiple, il est donc proposé que la vitesse de chacun des terminaux soit mesurée et que l'écartement des fréquences porteuses ( DELTA f1, DELTA f2) soit adaptée à chaque vitesse. Des interférences interporteuses sont ainsi évitées.
PCT/DE2001/003728 2001-09-28 2001-09-28 Modulation a porteuse multiple dependant de la vitesse WO2003036849A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE2001/003728 WO2003036849A1 (fr) 2001-09-28 2001-09-28 Modulation a porteuse multiple dependant de la vitesse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2001/003728 WO2003036849A1 (fr) 2001-09-28 2001-09-28 Modulation a porteuse multiple dependant de la vitesse

Publications (1)

Publication Number Publication Date
WO2003036849A1 true WO2003036849A1 (fr) 2003-05-01

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Family Applications (1)

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PCT/DE2001/003728 WO2003036849A1 (fr) 2001-09-28 2001-09-28 Modulation a porteuse multiple dependant de la vitesse

Country Status (1)

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WO (1) WO2003036849A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1478148A1 (fr) * 2003-05-15 2004-11-17 Siemens Aktiengesellschaft Procédé de communication multiporteuse sans fil avec attribution dynamique d'un spectre de frequence et d'une pluralité de sous-bandes
EP1538802A2 (fr) * 2003-12-03 2005-06-08 Samsung Electronics Co., Ltd. Dispositif et procédé de contrôle de l'adaptation de la modulation et du codage dans un système de communication de multiplexage par répartition en fréquences orthogonales
WO2006134122A1 (fr) * 2005-06-15 2006-12-21 Nokia Siemens Networks Gmbh & Co. Kg Procede de transmission de signaux dans un systeme de radiocommunication
EP1780967A1 (fr) * 2005-10-26 2007-05-02 Fujitsu Limited Réduction d'interférence dans un système de communications de type OFDM
WO2009106880A1 (fr) * 2008-02-29 2009-09-03 Roke Manor Research Limited Schéma de communication à modulation acoustique à porteuses multiples et son dispositif
CN101540748B (zh) * 2009-04-28 2013-01-09 华南理工大学 具有非均匀载波间距的多载波调制解调方法
EP2537279B1 (fr) * 2010-02-15 2018-10-03 Lantiq Beteiligungs-GmbH & Co.KG Génération des symboles pour des systémes multi-porteuses differents et opérés dans des bandes de fréquences superposées

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0938208A1 (fr) * 1998-02-22 1999-08-25 Sony International (Europe) GmbH Transmission multiporteuse, compatible au système GSM existant

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0938208A1 (fr) * 1998-02-22 1999-08-25 Sony International (Europe) GmbH Transmission multiporteuse, compatible au système GSM existant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MOOSE P H: "Differential modulation and demodulation of multi-frequency digital communications signals", MILCOM 90. A NEW ERA. 1990 IEEE MILITARY COMMUNICATIONS CONFERENCE. CONFERENCE RECORD (CAT. NO.90CH2831-6), MONTEREY, CA, USA, 30 SEPT.-3 OCT. 1990, 1990, New York, NY, USA, IEEE, USA, pages 273 - 277, XP010002788 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1478148A1 (fr) * 2003-05-15 2004-11-17 Siemens Aktiengesellschaft Procédé de communication multiporteuse sans fil avec attribution dynamique d'un spectre de frequence et d'une pluralité de sous-bandes
WO2004102913A1 (fr) * 2003-05-15 2004-11-25 Siemens Aktiengesellschaft Procede de communication sans fil a porteuses multiples a repartition dynamique de la largeur de frequence et du nombre des sous-bandes
KR101048194B1 (ko) 2003-05-15 2011-07-08 지멘스 악티엔게젤샤프트 주파수 폭 및 복수의 부대역을 동적으로 분할하는 무선 멀티-캐리어 통신 방법
EP1538802A2 (fr) * 2003-12-03 2005-06-08 Samsung Electronics Co., Ltd. Dispositif et procédé de contrôle de l'adaptation de la modulation et du codage dans un système de communication de multiplexage par répartition en fréquences orthogonales
EP1538802A3 (fr) * 2003-12-03 2006-12-20 Samsung Electronics Co., Ltd. Dispositif et procédé de contrôle de l'adaptation de la modulation et du codage dans un système de communication de multiplexage par répartition en fréquences orthogonales
WO2006134122A1 (fr) * 2005-06-15 2006-12-21 Nokia Siemens Networks Gmbh & Co. Kg Procede de transmission de signaux dans un systeme de radiocommunication
EP1780967A1 (fr) * 2005-10-26 2007-05-02 Fujitsu Limited Réduction d'interférence dans un système de communications de type OFDM
WO2009106880A1 (fr) * 2008-02-29 2009-09-03 Roke Manor Research Limited Schéma de communication à modulation acoustique à porteuses multiples et son dispositif
CN101540748B (zh) * 2009-04-28 2013-01-09 华南理工大学 具有非均匀载波间距的多载波调制解调方法
EP2537279B1 (fr) * 2010-02-15 2018-10-03 Lantiq Beteiligungs-GmbH & Co.KG Génération des symboles pour des systémes multi-porteuses differents et opérés dans des bandes de fréquences superposées

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