WO2008026787A1 - Dispositif de transmission numérique pour système de communication multi-antenne - Google Patents

Dispositif de transmission numérique pour système de communication multi-antenne Download PDF

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Publication number
WO2008026787A1
WO2008026787A1 PCT/KR2006/003418 KR2006003418W WO2008026787A1 WO 2008026787 A1 WO2008026787 A1 WO 2008026787A1 KR 2006003418 W KR2006003418 W KR 2006003418W WO 2008026787 A1 WO2008026787 A1 WO 2008026787A1
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WO
WIPO (PCT)
Prior art keywords
data symbols
unit
time
digital transmission
diffusion
Prior art date
Application number
PCT/KR2006/003418
Other languages
English (en)
Inventor
Soon-Up Hwang
Jong-Soo Seo
Original Assignee
Industry-Academic Cooperation Foundation, Yonsei University
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 Industry-Academic Cooperation Foundation, Yonsei University filed Critical Industry-Academic Cooperation Foundation, Yonsei University
Publication of WO2008026787A1 publication Critical patent/WO2008026787A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0625—Transmitter arrangements

Definitions

  • the present invention relates to a digital transmission device. More specifically, the present invention relates to a digital transmission device for a multi-antenna communication system.
  • the next-generation digital broadcasting technology is developing to a system technology that is capable of communicating HD-level images as well as fast data.
  • the digital multimedia broadcasting encompasses high transmission rate, due to a rapid increase in the amount of information.
  • the wireless environment is restricted with limited frequency resources, facing obstacles in achieving high transmission rates.
  • a time-space multiplexing technology in which reception can be improved and channel capacity can be expanded by transmitting the frequency and time-space-encoded signals by use of a multi-antenna, has been suggested.
  • the diversity technology generally includes technologies that use a temporal diversity, frequency diversity, or a space diversity.
  • the most widely used diversity technologies include an interleaving method, in which the temporal diversity is used, a channel coding method, an antenna diversity method, in which a directional antenna or an adaptive array antenna is used, and a polarity diversity method, in which different polarities of a transmission signal is transmitted.
  • the transmit diversity technology has been relatively less studied but has been increasingly studied to improve reception quality of mobile terminals .
  • the transmit diversity technology includes an orthogonal transmitter diversity (OTD), a delay diversity (DD), and a space-time transmitter diversity.
  • OTD orthogonal transmitter diversity
  • DD delay diversity
  • space-time transmitter diversity space-time transmitter diversity
  • the time-space encoding method is being integrated and developed based on the multi-input multi-output (MIMO) method and the orthogonal frequency division multiplexing method.
  • MIMO multi-input multi-output
  • the conventional space-time-frequency (STF) coding method space-time block codes (STBC) the transmission signal to obtain time and space diversity gains while obtaining a frequency gain by an orthogonal precoding at the same time.
  • STF space-time-frequency
  • STBC space-time block codes
  • the present invention provides a fast, high-quality digital transmission device that is appropriate for a next-generation broadcasting system, by implementing a time area diffusion unit that can obtain an additional diversity gain.
  • the present invention also provides a digital transmission device that is capable of providing a service in a high speed moving environment.
  • the present invention also provides a digital transmission device that can derive a transmission method of fast broadcasting and low power consumption and can have a corresponding transmission structure.
  • present invention can include a time area diffusion unit, an orthogonal precoding unit, a
  • time space coding unit time space coding unit
  • fast Fourier transform unit a fast Fourier transform unit
  • the digital transmission device can include a time area diffusion
  • the digital transmission device can also include: an orthogonal precoding unit
  • precoding unit in a time space area; and a fast Fourier transform unit transforming the
  • X k [ ⁇ k (o) MD - ⁇ k ⁇ M- i)] , delivered from the communication device, in a time area in accordance with equations, where k, being a natural number, indicates a k th subcarrier,
  • the orthogonal precoding unit can recombine the vector ( E a ) of odd-numbered diffusion data symbols and the vector ( E ) of even-numbered diffusion data symbols and transform the diffusion data symbols to have orthogonality in a frequency area in accordance with an equation
  • ⁇ is an FFT size configured for a digital transmission, and has a value of 2", n being a natural number; is any natural number between 1 and ⁇ 2 , inclusive of 1 and
  • 0 ⁇ is set to 2 ⁇ in accordance with the configured value of & v ;
  • W' & • is a unit matrix having a dimension of * x *" .
  • the fast Fourier transform unit can be disposed with 2 antennas for transmission.
  • the digital transmission device in accordance with another embodiment of the present invention can include: time area diffusion units in a quantity of n, n being a natural number, dividing data symbols delivered from a communication device into a group of odd-numbered data symbols and a group of even-numbered data symbols and diffusing the data symbols in a time area; and a serial-parallel transform unit distributing the data symbols delivered from the communication device in accordance with the time area diffusion unit.
  • the digital transmission device can also include: orthogonal precoding units in a quantity of n, n being a natural number, being connected to each of the n time area diffusion units and transforming the diffused data symbols, delivered from the time area diffusion unit, to data symbols having orthogonality in a frequency area; time space coding units in a quantity of n, n being a natural number, being connected to each of the
  • the orthogonal precoding unit in a time space area; and fast Fourier transform units in a
  • n being a natural number, being connected to each of the n time space
  • a time area diffusion unit of the n time area diffusion units can diffuse a data
  • the orthogonal precoding unit connected to the time area diffusion unit, can recombine the vector ( "* ) of odd-numbered diffusion data symbols and the vector
  • N is an FFT size configured for a digital transmission, and has a value of 2 n , n being a natural number;
  • * is any natural number between 1 and ⁇ 2 , inclusive of 1 and
  • 2& jj is set to in accordance with the configured value of ;
  • ⁇ ⁇ is a unit matrix having a dimension of ' ** x ⁇ "" ' * .
  • the fast Fourier transform unit can be disposed with 2 antennas for transmission.
  • FIG. 1 shows a structure of a digital transmission device.
  • FIG. 2 shows a conceptual diagram of diversity gain expansion of each element of the digital transmission device.
  • FIG. 3 shows the structure of a multi-antenna communication system having a plurality of digital transmission devices.
  • FIG. 1 is a diagram showing the structure of a digital transmission device.
  • the digital transmission device in accordance with an embodiment of the present invention can include a time area diffusion unit 110, an orthogonal precoding unit 120, a time space coding unit 130, and a fast Fourier transform unit 140.
  • the time area diffusion unit 110 can diffuse a signal for a data symbol, for example, an orthogonal frequency division multiplexing (OFDM) symbol, delivered from a communication device, to a time area.
  • OFDM orthogonal frequency division multiplexing
  • the diffusion process corresponding to the data symbol of the time area diffusion unit 110 can be described as follows.
  • the time area diffusion unit 110 diffuses every other adjacent data symbols. In other words, the time area diffusion unit 110 diffuses a group of odd-numbered data symbols separately from a group of even-numbered data symbols, along the time axis.
  • EQ. 1 expresses a matrix ( ⁇ ) of the data symbol delivered from a communication device.
  • the matrix ( x ) in accordance with an embodiment of the present invention consists only of data symbols carried on the k th subcarrier, whereas k is a natural number.
  • M is a natural number, and indicates how much the data symbols are diffused in the direction of time axis. It more detail, it shall be evident that, if there is a severe time fluctuation of time, the data symbols can be structured to maximize a time diversity gain by increasing the ⁇ M* value.
  • the identifying symbol of k being a natural number, will not be further described here.
  • EQ. 2 indicates a vector of the odd-numbered data symbols carried on the k th subcarrier, described with reference to EQ. 1, while EQ. 3 indicates a vector of the even-numbered data symbols.
  • EQ. 4 shows an orthogonal matrix used for the time diffusion process.
  • * * is a coefficient of the level of time diffusion, described with reference to EQ. 1, while ** indicates a Kronecker product.
  • EQ. 5 shows the process of diffusing the data symbols.
  • the equation on the top is a vector of odd-numbered diffusion data symbols obtained through the vector of odd-numbered data symbols (shown in EQ. 2) and the orthogonal matrix (shown in EQ.
  • the equation on the bottom is a vector of even-numbered diffusion data symbols obtained through the vector of odd-numbered data symbols (shown in EQ. 3) and the orthogonal matrix (shown in EQ. 4).
  • obtaining K can be separately disposed.
  • the present description will assume that the matrix of diffusion data symbols is obtained in the time area diffusion unit 110.
  • the matrix ( " " ) of diffused time area data symbols, obtained through the process described above, is delivered to the orthogonal precoding unit 120.
  • the orthogonal precoding unit 120 diffuses and distributes the matrix ( " " ) of diffused time area data symbols, delivered from the time area diffusion unit 110, along a frequency axis.
  • EQ. 6 is an equation of input/output relation of the orthogonal precoding unit
  • ⁇ Re( ⁇ ), ⁇ Im( ⁇ " ).
  • ⁇ ⁇ is a unit matrix having a dimension of TM' ⁇ x ⁇ ' ⁇ .
  • the FFT size can be configured according to the quality of data or the property (e.g., moving speed, cell radius, etc.) of a transmission medium.
  • ® can be changed according to the transmission environment as long as it has a value of 2 n , whereas n is a natural number.
  • ⁇ can be a value of a natural number between 1 and * 2 and can be greater as the frequency-selectivity of a transmission channel gets greater.
  • an appropriate value can be configured to structure the most economical, efficient system, as the process corresponding to a greater value can be complicated.
  • U ⁇ has a value of 2 ⁇ , corresponding to the configured & v value.
  • N/Q has a value of 2 (i.e., 8/4), and ⁇ "' ⁇ becomes a unit matrix having a dimension of 2*2.
  • P value of 5 can be calculated (however, if the K value is configured differently from
  • ⁇ will have a different value, in accordance with * ⁇ ).
  • EQ. 7 describes * and * , which are elements of & .
  • ⁇ and g can have orthogonality with each other.
  • the time space coding unit 130 codes s , which is delivered by the orthogonal precoding unit 120, to increase the time space diversity gain.
  • the time space coding unit 130 can be, of course, designed on the basis of an orthogonal frequency selective fading channel environment, and thus can easily realize STBC (Space-Time Block Code)-OFDM (Orthogonal Frequency Division Multiplexing). Since the time space coding unit 130 is a known technology, the description will not be provided here.
  • the fast Fourier transform unit 140 can transmit the coded data symbols, delivered from the time space coding unit 130.
  • the fast Fourier transform unit 140 can, of course, include a transmission antenna. If there are 2 transmission antennas, particularly, a space diversity gain can be obtained without an expansion of a bandwidth.
  • EQ. 8 shows data symbols transmitted from the digital transmission device
  • the matrix (-"- ⁇ * ) of data symbols, delivered as a plurality of parallel signals, can be made of a plurality of separate data symbols.
  • ⁇ fc W ⁇ is a data symbol corresponding to the k th subcarrier the vector (X(n)) of data symbols.
  • 1 ⁇ i ⁇ ⁇ can have the duration of ⁇ s .
  • N indicates the size of fast Fourier transform (FFT).
  • FFT fast Fourier transform
  • FIG. 2 is a conceptual diagram showing diversity gain expansion of each element of the digital transmission device. If it is assumed that the area in which the data symbol to be transmitted is carried on one subcarrier is represented by 200, no frequency diversity gain occurs as long as only the time space coding unit 130 is used. Moreover, if the frequency diversity gain of the data symbol is increased by using the orthogonal precoding unit 120 only, the diffusion gain can be expected only along the time axis area (the area represented by 220).
  • time space diffusion area 110 in accordance with an embodiment of the present invention is used, however, it becomes possible to diffuse the area to an area represented by 230. Particularly, if the diversity gain of the time, space, and frequency areas of the data symbol is increased together with the orthogonal precoding unit 120 and the time space coding unit 130, the data can be diffused to an area represented by 240. Through this, the reception quality can be improved, and strong transmission is possible despite the mobility.
  • FIG. 3 is a block diagram showing the structure of a multi-antenna communication system having a plurality of digital transmission devices.
  • the digital transmission system shown in FIG. 3 includes the plurality of digital transmission device in accordance with another embodiment of the present invention. Therefore, the elements already described with reference to FIG. 1 will not be repeated herein.
  • a serial-parallel transform unit 100 distributes the data symbols, delivered from a communication device, in accordance with a plurality of digital transmission devices (in a quantity of n, n being a natural number). It is possible, of course, to realize the serial-parallel transform unit 100 for data distribution in a form of software as well as hardware.
  • the present invention can transmit high-speed, high-quality data through a multiple digital transmission devices that are implemented with a time area diffusion unit that can obtain an additional diversity gain.
  • the present invention can also provide a service in a high speed moving environment through multiple digital transmission devices.
  • the present invention can also transmit large-capacity images and data through multiple digital transmission devices while consuming less power.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

Cette invention concerne un dispositif de transmission numérique pour un système de communication multi-antenne. Ce dispositif de transmission numérique comprend une unité de diffusion vers zone temporelle, laquelle divise des symboles de données provenant d'un dispositif de communication en un groupe de symboles de données numérotés impairs et un groupe de symboles de données numérotés pairs, et diffuse les symboles de données dans une zone temporelle. Selon le mode de réalisation décrit dans cette invention, la diffusion numérique et la communication peuvent être réalisées à des débits binaires élevés et ce mode de réalisation permet d'obtenir une meilleure qualité de réception.
PCT/KR2006/003418 2006-08-30 2006-08-30 Dispositif de transmission numérique pour système de communication multi-antenne WO2008026787A1 (fr)

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KR10-2006-0082769 2006-08-30
KR1020060082769A KR100807392B1 (ko) 2006-08-30 2006-08-30 다중 안테나 통신 시스템을 위한 디지털 전송장치

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040013180A1 (en) * 2002-04-22 2004-01-22 Giannakis Georgios B. Space-time multipath coding schemes for wireless communication systems
US20040022183A1 (en) * 2002-08-01 2004-02-05 Li Kuo Hui System and method for transmitting data in a multiple-branch transmitter-diversity orthogonal frequency-division multiplexing (OFDM) system
US20050249111A1 (en) * 2004-05-07 2005-11-10 Korea Electronics Technology Institute Method and apparatus for detecting STBC-OFDM signals in time-variant channels
US20060093061A1 (en) * 2004-11-04 2006-05-04 Samsung Electronics Co., Ltd. Apparatus and method for transmitting and receiving data using space-time block coding

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Publication number Priority date Publication date Assignee Title
US6317411B1 (en) * 1999-02-22 2001-11-13 Motorola, Inc. Method and system for transmitting and receiving signals transmitted from an antenna array with transmit diversity techniques
US6356528B1 (en) 1999-04-15 2002-03-12 Qualcomm Incorporated Interleaver and deinterleaver for use in a diversity transmission communication system
US6392988B1 (en) 1999-09-13 2002-05-21 Lucent Technologies Inc. Transmitter architecture employing space time spreading and orthogonal transmit diversity techniques
EP1182799A3 (fr) * 2000-08-22 2002-06-26 Lucent Technologies Inc. Procédé pour améliorer des communications à AMCR sans fil utilisant une diversité d'emission spatio-temporel
KR100525433B1 (ko) * 2000-12-30 2005-11-02 엘지전자 주식회사 시분할 듀플렉스 모드에서의 채널 코딩 장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040013180A1 (en) * 2002-04-22 2004-01-22 Giannakis Georgios B. Space-time multipath coding schemes for wireless communication systems
US20040022183A1 (en) * 2002-08-01 2004-02-05 Li Kuo Hui System and method for transmitting data in a multiple-branch transmitter-diversity orthogonal frequency-division multiplexing (OFDM) system
US20050249111A1 (en) * 2004-05-07 2005-11-10 Korea Electronics Technology Institute Method and apparatus for detecting STBC-OFDM signals in time-variant channels
US20060093061A1 (en) * 2004-11-04 2006-05-04 Samsung Electronics Co., Ltd. Apparatus and method for transmitting and receiving data using space-time block coding

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