WO2010002192A2 - Appareil d’émission et de réception avec diversité d’émission à l’aide d’un déplacement de sous-porteuse cyclique - Google Patents

Appareil d’émission et de réception avec diversité d’émission à l’aide d’un déplacement de sous-porteuse cyclique Download PDF

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Publication number
WO2010002192A2
WO2010002192A2 PCT/KR2009/003594 KR2009003594W WO2010002192A2 WO 2010002192 A2 WO2010002192 A2 WO 2010002192A2 KR 2009003594 W KR2009003594 W KR 2009003594W WO 2010002192 A2 WO2010002192 A2 WO 2010002192A2
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WIPO (PCT)
Prior art keywords
time domain
streams
frequency domain
domain streams
transmission apparatus
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Ceased
Application number
PCT/KR2009/003594
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English (en)
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WO2010002192A3 (fr
Inventor
Byung Jang Jeong
Taegyun Noh
Young Jo Ko
Jae Young Ahn
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Publication date
Priority claimed from KR1020090057692A external-priority patent/KR101596957B1/ko
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Priority to US12/999,225 priority Critical patent/US8526526B2/en
Publication of WO2010002192A2 publication Critical patent/WO2010002192A2/fr
Anticipated expiration legal-status Critical
Publication of WO2010002192A3 publication Critical patent/WO2010002192A3/fr
Ceased legal-status Critical Current

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    • 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
    • H04B7/0682—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 using phase diversity (e.g. phase sweeping)
    • 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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • 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
    • H04L27/2614—Peak power aspects

Definitions

  • the present invention relates to a diversity transmission technology using multiple transmit antennas in radio communication systems.
  • the OFDMA scheme may have a high peak to average power ratio (PAPR), which may be a result of a plurality of symbols being a complex number modulating/multiplexing a plurality of subcarriers in the OFDMA scheme.
  • PAPR peak to average power ratio
  • a single carrier frequency division multiple access (SC-FDMA) scheme may spread modulated symbol being a complex number using a discrete Fourier transform (DFT), and after that transmit spread symbols using a ordinary OFDMA scheme.
  • DFT discrete Fourier transform
  • a transmit antenna diversity transmission scheme may enhance a performance by transmitting a symbol using multiple antennas on a transmission side.
  • the transmit antenna diversity scheme is being widely adopted in radio communication systems using the OFDMA scheme, a code division multiple access (CDMA) scheme, and the like.
  • An aspect of the present invention provides a transmit diversity that may maintain a low peak to average power ratio (PAPR) while transmitting data using multiple antennas in a mobile communication system adopting a single carrier frequency domain multiple access (SC-FDMA) scheme.
  • PAPR peak to average power ratio
  • SC-FDMA single carrier frequency domain multiple access
  • Another aspect of the present invention also provides a new transmit diversity that may transmit a modulated symbol via a different frequency domain for each transmit antenna, when transmitting data using multiple antennas in a radio communication system.
  • a transmission apparatus including: a discrete Fourier transform (DFT) spreader to perform a DFT for a modulated symbol to generate frequency domain symbols; a resource mapper to map the frequency domain symbols and a plurality of frequency domain streams; a cyclic shift unit to perform a cyclic shift for each of the frequency domain streams according to a cyclic shift value that is determined with respect to each of the frequency domain streams; and a transmitter to perform an inverse DFT (IDFT) for the cyclic shifted frequency domain streams to generate a plurality of time domain streams, and to transmit the time domain streams to a reception apparatus using a transmit antenna corresponding to each of the time domain streams.
  • DFT discrete Fourier transform
  • a transmission apparatus including: a DFT spreader to perform a DFT for a modulated symbol to generate frequency domain symbols; a resource mapper to map the frequency domain symbols and a plurality of frequency domain streams; an IDFT despreader to perform an IDFT for the frequency domain streams to generate a plurality of time domain streams; a phase shift unit to perform a phase shift for each of the time domain streams according to a phase shift value that is determined with respect to each of the time domain streams; and a transmitter to transmit the phase-shifted time domain stream to a reception apparatus using a transmit antenna corresponding to each of the time domain streams.
  • a mobile communication system adopting an SC-FDMA scheme it is possible to transmit data in a form of providing a transmit diversity using multiple antennas while maintaining a low peak to average power ratio (PAPR).
  • PAPR peak to average power ratio
  • FIG. 1 is a block diagram illustrating a structure of a transmission apparatus to perform a cyclic shift for data in a frequency domain according to an embodiment of the present invention
  • FIG. 2 is a block diagram illustrating a partial structure of a transmission apparatus to generate a modulated symbol according to an embodiment of the present invention
  • FIG. 3 is a block diagram illustrating a structure of a transmitter according to an embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating a structure of a transmission apparatus to perform a phase shift for data in a time domain according to an embodiment of the present invention.
  • FIG. 5 is a block diagram illustrating a structure of a reception apparatus to detect a signal in a reception end according to an embodiment of the present invention.
  • FIG. 1 is a block diagram illustrating a structure of a transmission apparatus 100 to perform a cyclic shift for data in a frequency domain according to an embodiment of the present invention.
  • the transmission apparatus 100 may include a discrete Fourier transform (DFT) spreader 110, a resource mapper 120, a plurality of cyclic shift units 131, 132, 133, and 134, and a plurality of transmitters 141, 142, 143, and 144.
  • DFT discrete Fourier transform
  • the DFT spreader 110 may receive a predetermined number of symbols being a complex number to perform a DFT for the received symbols being a complex number to generate frequency domain symbols.
  • the number of symbols input into the DFT spreader 110 may be determined based on a transform size of the DFT spreader 110.
  • the resource mapper 120 may map the frequency domain symbols and a plurality of frequency domain streams.
  • the plurality of frequency domain streams may be allocated to different frequency bands.
  • the plurality of frequency domain streams may be allocated to a single frequency band.
  • the cyclic shift units 131, 132, 133, and 134 may perform a cyclic shift for each of the frequency domain streams according to a cyclic shift value that is determined with respect to each of the frequency domain streams.
  • the cyclic shift units 131, 132, 133, and 134 may determine the cyclic shift value with respect to each of the frequency domain streams.
  • the cyclic shift units 131, 132, 133, and 134 may determine the cyclic shift value to be different with respect to each of the frequency domain streams.
  • the cyclic shift units 131, 132, 133, and 134 may determine the cyclic shift value based on a number of transmit antennas 151, 152, 153, and 154 of the transmission apparatus 100, and a transform size of the DFT spreader 110.
  • the cyclic shift units 131, 132, 133, and 134 may determine, as the cyclic shift value, an integer fold increase of a value that is obtained by dividing the transform size of the DFT spreader 110 by the number of transmit antennas 151, 152, 153, and 154 or a number of subcarriers.
  • the cyclic shift unit 131 may determine, as the cyclic shift value, a "zero" fold increase of the value that is obtained by dividing the transform size of the DFT spreader 110 by the number of transmit antennas 151, 152, 153, and 154, that is, "4".
  • the cyclic shift unit 132 may determine, as the cyclic shift value, a "one” fold increase of the value that is obtained by dividing the transform size of the DFT spreader 110 by "4".
  • the cyclic shift unit 133 may determine, as the cyclic shift value, a "two” fold increase of the value that is obtained by dividing the transform size of the DFT spreader 110 by "4".
  • the cyclic shift unit 134 may determine, as the cyclic shift value, a "three” fold increase of the value that is obtained by dividing the transform size of the DFT spreader 110 by "4".
  • the transmitters 141, 142, 143, and 144 may perform an IDFT for the cyclic shifted frequency domain streams to generate a plurality of time domain streams.
  • the transmitters 141, 142, 143, and 144 may transmit the time domain streams to a reception apparatus 160 using a transmit antenna 151, 152, 153, or 154 corresponding to each of the time domain streams.
  • An operation of the transmitters 141, 142, 143, and 144 will be described in detail later with reference to FIG. 3.
  • FIG. 2 is a block diagram illustrating a partial structure of a transmission apparatus 200 to generate a modulated symbol according to an embodiment of the present invention.
  • the transmission apparatus 200 may include a channel encoder 210, an interleaver 220, a scrambler 230, and a modulator 240.
  • the channel encoder 210 may perform a channel coding for data.
  • the channel encoder 210 may perform the channel coding for the data using a convolutional coding scheme, a turbo coding scheme, or a low density parity check (LDPC) coding scheme.
  • LDPC low density parity check
  • the interleaver 220 may perform interleaving for the channel coded data.
  • the interleaver 220 may randomly rearrange a sequence of the channel coded data to thereby recover from a burst error occurring in a radio channel.
  • the scrambler 230 may perform an exclusive operation for the interleaved data and a scrambling sequence to generate scrambled data.
  • the modulator 240 may modulate the scrambled data to generate a modulated symbol.
  • the modulator 240 may modulate the scrambled data using a phase shift keying (PSK) scheme or a quadratic amplitude modulation (QAM) scheme.
  • PSK phase shift keying
  • QAM quadratic amplitude modulation
  • the modulated symbol may be input into the DFT spreader 110 of FIG. 1.
  • FIG. 3 is a block diagram illustrating a structure of a transmitter 300 according to an embodiment of the present invention.
  • the transmitter 300 may include an IDFT despreader 310 and a cyclic prefix (CP) inserter 320.
  • CP cyclic prefix
  • the IDFT despreader 310 may perform an IDFT for cyclic shifted frequency domain streams to generate time domain streams.
  • the generated time domain streams may be transmission signals of a single carrier frequency division multiple access (SC-FDMA) scheme.
  • SC-FDMA single carrier frequency division multiple access
  • a peak to average power ratio (PARP) of the time domain streams generated by the IDFT despreader 310 may be similar to a PARP of modulated symbols that are input into the DFT spreader 110.
  • PARP peak to average power ratio
  • the CP inserter 320 may insert a CP signal into each of the time domain streams.
  • Embodiments of performing a phase shift for data, transmitted via each transmit antenna, in a frequency domain have been described above with reference to FIGS. 1 through 3.
  • a cyclic shift in the frequency domain may correspond to a phase shift in a time domain.
  • an embodiment of performing the phase shift in the time domain to maintain a low PARP of a transmission signal of an SC-FDMA scheme will be described.
  • FIG. 4 is a block diagram illustrating a structure of a transmission apparatus 400 to perform a phase shift for data in a time domain according to an embodiment of the present invention.
  • a DFT spreader 410 may perform a DFT for a modulated symbol to generate frequency domain symbols. According to an embodiment of the present invention, the DFT spreader 410 may perform the DFT for the modulated symbol using the channel encoder 210, the interleaver 220, the scrambler 230, and the modulator 240 of FIG. 2.
  • a resource mapper 420 may map the frequency domain symbols and a plurality of frequency domain streams.
  • the plurality of frequency domain streams may be allocated to different frequency bands.
  • the plurality of frequency domain streams may be allocated to a single frequency band.
  • An IDFT despreader 430 may perform an IDFT for the frequency domain streams to generate time domain streams corresponding to the frequency domain streams.
  • Each of the time domain stream may be an SC-FDMA signal that is transmitted via each of multiple transmit antennas 461, 462, 463, and 464.
  • Phase shift units 441, 442, 443, and 444 may perform a phase shift for each of the time domain streams according to a phase shift value that is determined with respect to each of the time domain streams. According to an embodiment of the present invention, phase shift values with respect to the time domain streams may be different from each other.
  • the phase shift units 441, 442, 443, and 444 may determine a phase shift value. For example, the phase shift units 441, 442, 443, and 444 may determine a phase shift value according to each of the time domain streams, based on a number of transmit antennas 461, 462, 463, and 464 of the transmission apparatus 400. For example, the phase shift units 441, 442, 443, and 444 may determine, as the phase shift value with respect to each of the time domain streams, an integer fold increase of an inverse number of the number of transmit antennas 461, 462, 463, and 464.
  • the phase shift unit 441 may determine, as the phase shift value, a "zero" fold increase of the inverse of the number of transmit antennas 461, 462, 463, and 464, that is, "4".
  • the phase shift unit 442 may determine, as the phase shift value, a "one” fold increase of the inverse of "4".
  • the phase shift unit 443 may determine, as the phase shift value, a "two” fold increase of the inverse of "4".
  • the phase shift unit 444 may determine, as the phase shift value, a "three” fold increase of the inverse of "4". It may be given by the following Equation 1:
  • phase shift value may be multiplied with an output signal string of the IDFT despreader 430 for each symbol to thereby generate a phase shifted output signal of each symbol-wise product.
  • the time domain streams transmitted via the transmit antennas 461, 462, 463, and 464 may be phase shifted according to a different phase shift value.
  • Transmitters 451, 452, 453, and 454 may transmit the time domain streams to a reception apparatus 470 via the transmit antenna 461, 462, 463, or 464 corresponding to each of the time domain streams.
  • the transmitters 451, 452, 453, and 454 may insert a CP signal into each of the time domain streams, and transmit the time domain streams with the inserted CP to the reception apparatus 470.
  • FIG. 5 is a block diagram illustrating a structure of a reception apparatus 500 according to an embodiment of the present invention. Although a single receive antenna is shown in FIG. 5, the present invention may be applicable to a plurality of receive antennas as is.
  • a receiver 510 may receive, from a transmission apparatus (not shown), a plurality of time domain streams that are cyclic shifted according to different cyclic shift values. Each of the time domain streams may be transmitted via a radio channel formed from the transmission apparatus to the reception apparatus 500.
  • the receiver 510 may remove a CP in each of the time domain streams, and perform a DFT for the time domain streams in which the CP is removed.
  • the receiver 510 may perform a DFT for the time domain streams to generate frequency domain streams.
  • a difference between cyclic shift values of the time domain streams may be in inverse proportion to the number of transmit antennas.
  • the receiver may receive time domain streams using the same number of subcarriers as a number of transmit antennas of a transmission apparatus.
  • a frequency domain equalizer 520 may equalize the frequency domain streams using channel information that is estimated for a channel estimation process. Specifically, the frequency domain equalizer 520 may perform an IDFT for an equalized frequency domain stream to generate a time domain symbol.
  • An IDFT despreader 530 may perform an inverse operation of a spread process by the DFT spreader 110 or 410.
  • the present invention may be applicable as is.
  • a difference between cyclic shift values of time domain streams may be in proportion to a transform size of the IDFT despreader 530.
  • a demodulator 540 may demodulate a time domain symbol.
  • the demodulator may detect a de-spread signal using a symbol, being a complex number, of QPSK, 16QAM, 64QAM, and the like, and may transform the detected signal based on a bit unit.
  • the demodulator 540 may receive a soft input and generate a soft output according to a receiver type.
  • a descrambler 550 may descramble the demodulated time domain symbol.
  • a channel decoder 560 may perform a channel decoding for the descrambled time domain symbol.
  • the frequency domain equalizer 520 may be constructed as follows. Modulated frequency domain symbols may be transmitted by a plurality of subcarriers via a plurality of transmit antennas of a transmission side. Therefore, a reception end may need to perform a frequency domain equalization with respect to the plurality of subcarriers.
  • a frequency domain stream after the reception apparatus performs a DFT for the time domain stream may be expressed by the following Equation 2:
  • Equation 2 a reception value at a k th subcarrier of a frequency domain stream
  • H i k denotes a frequency response of a k th subcarrier of an i th transmit antenna
  • X k denotes a frequency domain signal of a transmission side.
  • X k denotes a k th symbol among outputs of the DFT spreader 110 of FIG. 1 or the DFT spreader 410 of FIG. 4.
  • N k denotes a frequency domain noise in the k th subcarrier.
  • the equalizer 540 may restore a transmission signal from M frequency domain received signals, using a minimum mean square error (MMSE) scheme or a zero forcing scheme, with respect to a transmit diversity transmission scheme by a cyclic subcarrier shift disclosed in the present invention.
  • MMSE minimum mean square error
  • each of frequency domain streams received by the receiver 510 may include a plurality of frequency domain symbols.
  • frequency domain streams simultaneously equalized by the frequency domain equalizer 520 may be spaced apart from each other by a value that is obtained by dividing a transformed magnitude of the IDFT despreader 530 by a number of transmit antennas.

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

Abstract

La présente invention concerne une technologie adoptant de multiples antennes d’émission dans un système de communication radio. Dans un système de communication mobile d’un schéma d’accès multiple par répartition en fréquence de porteuse de signal (SC-FDMA), il est possible d’émettre des données à l’aide des multiples antennes d’émission, tout en maintenant un faible rapport puissance crête à puissance moyenne (PAPR). Il est également possible de fournir une nouvelle émission de diversité d’émission même dans un système de communication radio général comprenant un accès multiple par répartition orthogonale de la fréquence (OFDMA), un schéma d’accès multiple par répartition en code (CDMA) ou leur équivalent.
PCT/KR2009/003594 2008-07-02 2009-07-01 Appareil d’émission et de réception avec diversité d’émission à l’aide d’un déplacement de sous-porteuse cyclique Ceased WO2010002192A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/999,225 US8526526B2 (en) 2008-07-02 2009-07-01 Apparatus for transmission and reception with transmit diversity using cyclic subcarrier shift

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20080064007 2008-07-02
KR10-2008-0064007 2008-07-02
KR1020090057692A KR101596957B1 (ko) 2008-07-02 2009-06-26 순환 부캐리어 천이를 이용한 송신 안테나 다이버시티 전송 방법 및 장치
KR10-2009-0057692 2009-06-26

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WO2010002192A2 true WO2010002192A2 (fr) 2010-01-07
WO2010002192A3 WO2010002192A3 (fr) 2011-03-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11569938B2 (en) 2020-01-21 2023-01-31 Electronics And Telecommunications Research Institute Method and apparatus for transmitting and receiving signal using multiple antennas
CN115225443B (zh) * 2022-06-28 2023-08-25 苏州大学 载波循环移位方法和循环移位光滤波器组多载波系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070206686A1 (en) * 2006-01-05 2007-09-06 Vook Frederick W Method and apparatus for performing cyclic-shift diversity with beamforming
JP2007329588A (ja) * 2006-06-06 2007-12-20 Fujitsu Ltd 送信機及び送信方法
JP4930006B2 (ja) * 2006-11-22 2012-05-09 日本電気株式会社 移動通信装置、移動通信システム及びそれに用いる消費電力削減方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11569938B2 (en) 2020-01-21 2023-01-31 Electronics And Telecommunications Research Institute Method and apparatus for transmitting and receiving signal using multiple antennas
CN115225443B (zh) * 2022-06-28 2023-08-25 苏州大学 载波循环移位方法和循环移位光滤波器组多载波系统

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