WO2007066949A2 - Appareil d'émission/réception d'un appareil à canal à large bande sans fil mettant en oeuvre plusieurs porteuses - Google Patents

Appareil d'émission/réception d'un appareil à canal à large bande sans fil mettant en oeuvre plusieurs porteuses Download PDF

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Publication number
WO2007066949A2
WO2007066949A2 PCT/KR2006/005196 KR2006005196W WO2007066949A2 WO 2007066949 A2 WO2007066949 A2 WO 2007066949A2 KR 2006005196 W KR2006005196 W KR 2006005196W WO 2007066949 A2 WO2007066949 A2 WO 2007066949A2
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WO
WIPO (PCT)
Prior art keywords
signal
radio channel
transmitting
carrier
denotes
Prior art date
Application number
PCT/KR2006/005196
Other languages
English (en)
Other versions
WO2007066949A3 (fr
Inventor
Hyun-Kyu Chung
Kwang-Chun Lee
Original Assignee
Electronics And Telecommunications Research Institute
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 KR1020060066849A external-priority patent/KR20070061215A/ko
Application filed by Electronics And Telecommunications Research Institute filed Critical Electronics And Telecommunications Research Institute
Priority to US12/096,450 priority Critical patent/US7974180B2/en
Publication of WO2007066949A2 publication Critical patent/WO2007066949A2/fr
Publication of WO2007066949A3 publication Critical patent/WO2007066949A3/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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0256—Channel estimation using minimum mean square error criteria
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response
    • 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
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • 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
    • H04L27/2647—Arrangements specific to the receiver only

Definitions

  • the present invention relates to transmitting/receiving apparatuses of a wideband radio channel measuring device using a multi-carrier, and more particularly, relates to a measuring device for measuring radio channel information in an orthogonal frequency division multiplexing (OFDM) wireless communication method for transmitting data by using a plurality of subcarriers perpendicular to each other.
  • OFDM orthogonal frequency division multiplexing
  • a pseudo random binary sequence (PRBS) method as shown in FIG. 1 has been conventionally used to measure a radio channel.
  • PRBS pseudo random binary sequence
  • a pseudo random code chip having a speed that is equal to that of a bandwidth to be measured is formed to transmit a transmission signal, and a receiver correlates the transmission signal and a sum of multipath waveforms corresponding to the transmission signal to obtain a frequency impulse response of a corresponding band.
  • a unit length of the pseudo random code is less than 1/W [Sec] for a measurement band having a bandwidth of W[Hz].
  • the unit length of the pseudo random code is required to have a short chip pulse that is inversely proportional to the bandwidth, according to a trend of the wideband mobile communication service and system.
  • the PRBS method is difficult to be realized, and it is difficult to measure an impact response characteristic of the radio channel in a bandwidth variation configuration.
  • the present invention has been made in an effort to provide transmitting/receiving apparatuses of a wideband radio channel measuring device for measuring radio channel characteristics at a frequency domain by using multi-carriers.
  • transmitting radio channel information in an orthogonal frequency division multiplexing radio channel measuring system includes a serial/parallel converter, an inverse fast Fourier transform unit, a guard interval adder, and a parallel/serial converter.
  • the serial/parallel converter converts a measurement signal into a discrete parallel signal.
  • the inverse fast Fourier transform unit transforms the converted parallel signal into a transmission signal modulated by using a multi-carrier on a measurement bandwidth.
  • the guard interval adder adds a guard interval to the transformed transmission signal.
  • the parallel/serial converter converts the transmission signal having the guard interval into a serial signal at a time domain, and externally transmits it through a transmission antenna.
  • transmitting radio channel information in an orthogonal frequency division multiplexing radio channel measuring system includes an analog/digital converter, a serial/ parallel converter, a guard interval eliminator, and a minimum mean square error estimator.
  • the analog/digital converter receives a transmission signal from a transmitter for modulating a measurement signal by using a multi-carrier and transmitting the measurement signal as the transmission signal, and converts the transmission signal into a digital signal.
  • the serial/parallel converter converts the converted digital signal into a discrete parallel signal, and generates a received signal having a radio channel impact response.
  • the guard interval eliminator eliminates a guard interval from the received signal.
  • the minimum mean square error estimator allocates a minimum mean square error algorithm to the received signal having no guard interval to estimate a channel at a frequency domain rather than estimating the channel at a time domain, and outputs the radio channel information of the received signal.
  • the measurement frequency bandwidth may be freely increased or reduced.
  • channel characteristics at different bands may be simultaneously measured in the SISO configuration.
  • the channel characteristics may be simultaneously measured while maintaining a maximum Doppler measurement frequency at a predetermined level regardless of the increase of the number of the transmitting and receiving antennas, in the MEMO configuration.
  • FIG. 1 shows a diagram representing a radio channel measuring method using a conventional pseudo random binary sequence (PRBS) method.
  • PRBS pseudo random binary sequence
  • FIG. 2 shows a block diagram of an internal configuration of a transmitter of a wideband radio channel measuring device using a multi-carrier according to an exemplary embodiment of the present invention.
  • FIG. 3 shows a block diagram of an internal configuration of a receiver of the
  • FIG. 4 shows a simulation result for comparing receiving performance according to a Doppler frequency at a time- varying channel.
  • FIG. 5 shows a dual-band channel measuring method for simultaneously measuring a dual-band channel in a single transmitting/receiving antenna configuration according to the exemplary embodiment of the present invention.
  • FIG. 6 shows a diagram representing multi-carriers sequentially transmitted for respective transmitting antennas in multiple transmitting/receiving antennas according to the exemplary embodiment of the present invention.
  • FIG. 7 shows a diagram representing multi-carriers simultaneously transmitting for the respective transmitting antennas in the multiple transmitting/receiving antennas according to the exemplary embodiment of the present invention. Best Mode for Carrying Out the Invention
  • FIG. 2 shows a block diagram of an internal configuration of the transmitter of the wideband radio channel measuring device using the multi-carrier according to the exemplary embodiment of the present invention.
  • the transmitter using the multi-carrier is the radio channel measuring device using the orthogonal multi-carrier, for convenience of description.
  • the transmitter according to the exemplary embodiment of the present invention a mapping unit 200, a serial/parallel converter 210, an inverse fast Fourier transform unit
  • the mapping unit 200 transforms input data into frequency domain symbol data by using a modulation method used in an orthogonal frequency division multiplexing subchannel, and allocates the transformed symbol data to a predetermined subchannel.
  • the mapping unit 200 detects a carrier frequency error or a sampling frequency error to compensate the detected error, or allocates a pilot signal to the subchannel to estimate a channel quality.
  • the mapping unit 200 transmits the transformed symbol data and the pilot signal to the serial/parallel converter 210.
  • the serial/parallel converter 210 converts the signal received from the mapping unit 200 into a discrete parallel signal, and transmits the parallel signal to the inverse fast Fourier transform unit 220.
  • the inverse fast Fourier transform unit 220 transforms the data and pilot signal received from the serial/parallel converter 210 into a time domain transmission signal, and transmits it to the guard interval adder 230.
  • the transmission signal is formed by modulating the received data and pilot signal by using the orthogonal multi-carrier through the measurement bandwidth.
  • Es denotes an orthogonal frequency division multiplexing (OFDM) symbol energy
  • N denotes a size of fast Fourier transform (FFT)
  • P denotes the number of active subcarriers
  • L denotes a length of a guard interval.
  • the guard interval adder 230 adds the guard interval to the transmission signal received from the inverse fast Fourier transform unit 220 to prepare a delay spread that causes performance deterioration in a wireless channel environment.
  • the parallel/serial converter 240 converts the transmission signal received from the guard interval adder 230 into a serial signal in a time domain to transmit the converted serial signal to the digital/analog converter 250.
  • the digital/analog converter 250 converts a digital signal into an analog signal to generate the analog signal to be transmitted through an antenna.
  • the transmitter uses the multi-carrier or the orthogonal multi-carrier to modulate the measurement signal corresponding to the bandwidth for measuring a channel at a frequency domain rather than a time domain, and transmits the modulated signal.
  • FIG. 3 shows a block diagram of an internal configuration of the receiver of the wideband radio channel measuring device using the multi-carrier according to the exemplary embodiment of the present invention.
  • the receiver using the multi-carrier is the radio channel measuring device using the orthogonal multi-carrier, for convenience of description.
  • the receiver according to the exemplary embodiment of the present invention includes an analog/digital converter 300, a serial/parallel converter 310, a guard interval eliminator 320, and an MMSE estimator 330.
  • the analog/digital converter 300 converts the received analog signal into a digital signal, and transmits the converted digital signal to the serial/parallel converter
  • the serial/parallel converter 310 converts the digital signal into a discrete parallel signal, and transmits the parallel signal to the guard interval eliminator 320.
  • the guard interval eliminator 320 eliminates a guard interval from the parallel signal received from the serial/parallel converter 310, and transmits it to a minimum mean square error (MMSE) channel estimator.
  • MMSE minimum mean square error
  • the received signal Y (n) may be given as Math Figure 2 or Math Figure 3.
  • n denotes a time parameter
  • k denotes a multipath delay
  • w(n) denotes a white
  • X(n) denotes a transmission signal
  • h(n,k) denotes a single input single output time- varying radio channel impact response.
  • the MMSE channel estimator 330 allocates a minimum mean square error
  • PN pseudo-random
  • FIG. 4 shows a simulation result for comparing receiving performance according to a Doppler frequency fd at the time- varying channel.
  • the result shows that the linear MMSE receiving method according to the exemplary embodiment of the present invention achieves greater performance compared to the conventional PRBS method, when the time- varying characteristic is provided during the symbol period of the measurement signal.
  • the above linear MMSE receiving method corresponds to a single input single output configuration of a single transmitting/receiving antenna.
  • the radio channel is
  • a baseband signal corresponding to the measurement bandwidth is modulated by using the multi-carrier or the orthogonal multi-carrier, and is transmitted.
  • dual-band channel characteristics having the divided measurement channel as shown in FIG. 5 may be simultaneously measured.
  • subcarriers are disposed on locations corresponding to bidirectional measurement bandwidth based on the entire bandwidth to simultaneously measure the channel in the dual-band.
  • the multi-carrier is disposed for each transmitting antenna as shown in FIG. 6 or FIG. 7, and therefore multiple channels may be simultaneously measured at the same transmitting/receiving band.
  • the multi-carrier is sequentially or simultaneously transmitted according to a demand for a power amplifier of the transmitter. When it is sequentially transmitted, it is required to finish transmission processes of all the transmitting antennas during a coherent time.
  • the subcarriers are disposed for each transmitting antenna as shown in FIG. 6 or FIG. 7, and N x M radio channels may be simultaneously estimated.
  • N and M respectively denote the number of transmitting and receiving antennas.
  • the linear MMSE receiving method of the multiple input multiple output configuration has a merit in that a gap between the subcarriers disposed in the transmitting antenna may be formed in a coherence bandwidth.
  • a process for measuring the radio channel information is the same as that of the single input single output configuration.
  • Doppler measuring range is inversely proportional to the increase of the number of the transmitting antennas. However, when the OFDM method is sequentially used for each transmitting antenna, the Doppler measuring range is fixed regardless of the number of transmitting antennas.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

L'invention concerne des appareils d'émission/réception d'un dispositif de mesure de canal radio à large bande mettant en oeuvre plusieurs porteuses. Le dispositif de mesure de canal radio à large bande mettant en oeuvre plusieurs porteuses peut mesurer des caractéristiques du canal radio à un domaine de fréquence. Du fait que le canal radio est mesuré au domaine de fréquences par le dispositif de mesure de canal radio à large bande mettant en oeuvre plusieurs porteuses, les caractéristiques du canal peuvent être mesurées et une fréquence de mesure maximale de Doppler est maintenue simultanément à un niveau prédéterminé, indépendemment de l'augmentation du nombre d'antennes émettrices et réceptrices, dans une configuration MIMO.
PCT/KR2006/005196 2005-12-08 2006-12-05 Appareil d'émission/réception d'un appareil à canal à large bande sans fil mettant en oeuvre plusieurs porteuses WO2007066949A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/096,450 US7974180B2 (en) 2005-12-08 2006-12-05 Transmitting/receiving apparatus of wideband wireless channel apparatus using multiple carriers

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20050119874 2005-12-08
KR10-2005-0119874 2005-12-08
KR10-2006-0066849 2006-07-18
KR1020060066849A KR20070061215A (ko) 2005-12-08 2006-07-18 다중 반송파를 이용한 광대역 무선 채널 측정 장치의송수신 장치

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WO2007066949A2 true WO2007066949A2 (fr) 2007-06-14
WO2007066949A3 WO2007066949A3 (fr) 2008-08-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009038269A1 (fr) * 2007-09-20 2009-03-26 Electronics And Telecommunication Research Institute Système de sondage de canal en communications mobiles à porteuse unique large bande et procédé
WO2009075458A1 (fr) * 2007-12-10 2009-06-18 Electronics And Telecommunications Research Institute Système de mesure de canal radio à antennes multiples et procédé qui produit un signal de temporisation de duplex à répartition dans le temps et mesure d'un canal radio bilatéral
US9020494B2 (en) 2010-02-03 2015-04-28 Huawei Technologies Co., Ltd. Method, apparatus, and system for measuring aggregated carrier cell

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5682376A (en) * 1994-12-20 1997-10-28 Matsushita Electric Industrial Co., Ltd. Method of transmitting orthogonal frequency division multiplex signal, and transmitter and receiver employed therefor
EP0886408A2 (fr) * 1997-06-19 1998-12-23 Hitachi Denshi Kabushiki Kaisha Transmission multiporteuse employant les intervalles de garde pour la réduction des effets de discontinuités
DE19963620A1 (de) * 1999-12-29 2001-07-12 Bosch Gmbh Robert Verfahren zur Bestimmung des Übertragungsverhaltens einer Transmissionsstrecke

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5682376A (en) * 1994-12-20 1997-10-28 Matsushita Electric Industrial Co., Ltd. Method of transmitting orthogonal frequency division multiplex signal, and transmitter and receiver employed therefor
EP0886408A2 (fr) * 1997-06-19 1998-12-23 Hitachi Denshi Kabushiki Kaisha Transmission multiporteuse employant les intervalles de garde pour la réduction des effets de discontinuités
DE19963620A1 (de) * 1999-12-29 2001-07-12 Bosch Gmbh Robert Verfahren zur Bestimmung des Übertragungsverhaltens einer Transmissionsstrecke

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009038269A1 (fr) * 2007-09-20 2009-03-26 Electronics And Telecommunication Research Institute Système de sondage de canal en communications mobiles à porteuse unique large bande et procédé
US8351411B2 (en) 2007-09-20 2013-01-08 Electronics And Telecommunications Research Institute System for channel sounding of broadband signal carrier mobile communications and method thereof
WO2009075458A1 (fr) * 2007-12-10 2009-06-18 Electronics And Telecommunications Research Institute Système de mesure de canal radio à antennes multiples et procédé qui produit un signal de temporisation de duplex à répartition dans le temps et mesure d'un canal radio bilatéral
US8358601B2 (en) 2007-12-10 2013-01-22 Electronics And Telecommunications Research Institute Multi-antenna radio channel measurement system and method which generates time division duplex timing signal and measures two-way radio channel
US9020494B2 (en) 2010-02-03 2015-04-28 Huawei Technologies Co., Ltd. Method, apparatus, and system for measuring aggregated carrier cell
US9301190B2 (en) 2010-02-03 2016-03-29 Huawei Technologies Co., Ltd. Method, apparatus, and system for measuring aggregated carrier cell

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