WO2010050384A1 - マルチユーザmimoシステム、受信装置および送信装置 - Google Patents
マルチユーザmimoシステム、受信装置および送信装置 Download PDFInfo
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- WO2010050384A1 WO2010050384A1 PCT/JP2009/068073 JP2009068073W WO2010050384A1 WO 2010050384 A1 WO2010050384 A1 WO 2010050384A1 JP 2009068073 W JP2009068073 W JP 2009068073W WO 2010050384 A1 WO2010050384 A1 WO 2010050384A1
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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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
-
- 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
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0026—Interference mitigation or co-ordination of multi-user interference
-
- 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
- H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
-
- 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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
- H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
-
- 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
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
-
- 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
- H04L27/2649—Demodulators
- H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
- H04L27/26526—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation with inverse FFT [IFFT] or inverse DFT [IDFT] demodulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] receiver or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0026—Interference mitigation or co-ordination of multi-user interference
- H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
- H04J11/0046—Interference mitigation or co-ordination of multi-user interference at the receiver using joint detection algorithms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
Definitions
- the receiving apparatus of the present invention is a receiving apparatus applied to a multiuser MIMO system in which a plurality of transmitting apparatuses transmit to at least one receiving apparatus, and is different at the same time and at the same frequency.
- a receiving unit that receives a signal transmitted by a transmission method, a MIMO separation unit that separates the received signal for each transmission device, and a switching unit that switches an output destination according to the transmission method of the separated signal; And a signal processing unit that is provided for each transmission method and processes an output signal from the switching unit in accordance with the transmission method.
- the MIMO separation unit separates signals multiplexed only in a part of the frequency band of the system band using MMSE weights.
- a plurality of transmission devices perform wireless transmission using different transmission methods, and at least one reception device receives a signal transmitted wirelessly from each transmission device, and separates the received signal for each transmission device.
- the receiving device can separate the signals even in an environment where transmitting devices that perform wireless transmission with different transmission methods coexist.
- each transmission apparatus can determine a transmission system irrespective of the transmission system of another transmission apparatus. As a result, cell throughput can be improved.
- FIG. 2 is a diagram illustrating a schematic configuration of a transmission apparatus that performs transmission using Clustered DFT-S-OFDM. It is a figure which shows the structure of the transmitter which transmits by OFDM. It is a figure which shows a mode that the spectrum of Clustered DFT-S-OFDM and OFDM was multiplexed. It is a figure which shows the structure of the MIMO isolation
- each transmission device performs single carrier transmission or multicarrier transmission. It is assumed that the signal is mixed with single carrier and multicarrier.
- the present invention realizes a communication system that can separate signals of each user even in the above environment.
- FIG. 1 is a diagram illustrating a schematic configuration of a transmission apparatus that performs transmission using a single carrier.
- single carrier transmission is defined as a transmission method for generating a signal in the time domain
- multicarrier transmission is defined as a transmission method for generating a signal in the frequency domain. To do. Therefore, in the first embodiment, pure single carrier transmission will be described as an example of single carrier transmission.
- information data that is, a data bit sequence is input to an error correction encoding unit 10.
- the error correction coding unit 10 performs error correction coding such as a convolutional code, a turbo code, or an LDPC (Low Density Parity Check) code on the input data bit sequence string, and obtains the obtained coded bit sequence. And output to the interleave unit 11.
- the interleaving unit 11 rearranges the order for randomizing the influence of the propagation path, and outputs the result to the modulation unit 12.
- the modulation unit 12 generates N FFT symbols for modulation symbols such as QPSK (Quaternary Phase Shift Keying) and 16QAM (Quadrature Amplitude Modulation), and outputs them to the GI addition unit 13.
- the input signal performs processing for adding in front of the rear N GI inputted signal symbol signals N FFT symbols, and outputs a signal sequence of N FFT + N GI symbols.
- the data signal s (t) output from the GI adding unit 13 at time t is input to the frame configuration unit 14 and multiplexed with the reference signal generated by the reference signal generation unit 15 to form a frame, and the radio transmission unit 16 is output.
- the wireless transmission unit 16 performs processing such as D / A (Digital to Analog) conversion, up-conversion, and band-pass filtering on the input digital signal, and then transmits from the antenna unit 17.
- D / A Digital to Analog
- FIG. 2 is a diagram showing a schematic configuration of a transmission apparatus that performs transmission by OFDM.
- the OFDM transmission device configuration is configured by inserting an IFFT (Inverse Fast Fourier Transform) unit 20 between the modulation unit 12 and the GI addition unit 13 in the single carrier transmission device configuration shown in FIG.
- the configuration is the same.
- the IFFT unit 20 performs processing for converting the modulation symbol into the time domain.
- each transmission device includes one transmission antenna, and an example in which only one transmission signal is transmitted has been described.
- one transmission device includes a plurality of antennas, A plurality of transmission signals may be transmitted using a plurality of systems.
- H n, u, l and ⁇ l are the complex channel gain and delay time between the u th transmitting device and the n th receiving antenna in the l th path, respectively, and s u (t) is the u th transmission at time t.
- the transmission signal ⁇ n (t) of the device is thermal noise at the nth receiving antenna.
- FIG. 5 is a diagram showing a schematic configuration of the single carrier processing unit 42.
- the frequency domain signal of the u-th user subjected to the separation is converted into the time domain by the IFFT unit 50.
- the demodulation unit 51 performs demodulation based on the modulation performed by the transmission device.
- the deinterleaving unit 52 performs the process of returning the interleaving performed by the transmission device, and the error correction decoding unit 53 performs the error correction decoding process. Thereby, the data transmitted by the u-th user is obtained.
- FIG. 7 is a diagram illustrating a schematic configuration of the MIMO separation unit 40.
- the channel matrix estimation value (expressed by equation (5)) and the noise power estimation value ⁇ 2 input from the channel estimation unit 36 are input to the weight generation unit 70.
- the weight generation unit 70 calculates weights such as MMSE (Minimum Mean Square Error) weights and ZF (Zero Forcing) weights.
- MMSE Minimum Mean Square Error
- ZF Zero Forcing
- FIG. 9 is a diagram illustrating a schematic configuration of a transmission apparatus that performs transmission using Clustered DFT-S-OFDM.
- a DFT unit 90 Compared with the configuration of the transmission apparatus that performs transmission with a single carrier illustrated in FIG. 1, a DFT unit 90, a spectrum mapping unit 91, and an IFFT unit 92 are inserted between the modulation unit 12 and the GI addition unit 13. Only the point is different.
- the IFFT unit 92 applies an N FFT point IFFT to the frequency signal after allocation obtained by the spectrum mapping unit 91, converts the frequency signal into an N FFT symbol time domain signal, and outputs the signal.
- the output of the IFFT unit 92 is input to the GI adding unit 13.
- the subsequent processing is the same as in the case of the first embodiment shown in FIG.
- FIG. 10 is a diagram illustrating a configuration of a transmission apparatus that performs transmission by OFDM.
- this transmission apparatus has only an S / P conversion section 100 instead of the DFT section 90.
- the S / P conversion unit 100 performs serial-parallel conversion on the signal input from the modulation unit 12 and outputs the result to the spectrum mapping unit 91.
- the subsequent processing is the same as that of the transmission apparatus that performs transmission by Clustered DFT-S-OFDM shown in FIG.
Abstract
Description
11 インタリーブ部
12 変調部
13 GI付加部
14 フレーム構成部
15 参照信号生成部
16 無線送信部
17 アンテナ部
20 IFFT部
30-1~30-p アンテナ部
31-1~31-p 無線受信部
32-1~32-p 参照信号分離部
33-1~33-p GI除去部
34-1~34-p FFT部
35 信号処理部
36 伝搬路推定部
40 MIMO分離部
41 切り替え部
42 シングルキャリア処理部
43 マルチキャリア処理部
50 IFFT部
51 復調部
52 デインタリーブ部
53 誤り訂正復号部
60 P/S変換部
70 重み生成部
71 重み乗算部
90 DFT部
91 スペクトルマッピング部
92 IFFT部
100 P/S変換部
120 MIMO分離部
121 ゼロ置換部
122 送信スペクトル情報部
123 重み生成部
124 重み乗算部
125 スペクトルデマッピング部
次に、本発明に係る実施形態について、図面を参照しながら説明する。第1の実施形態では、複数の送信装置が同一時刻同一周波数で基地局にアクセスを行なうマルチユーザMIMOシステムにおいて、各送信装置がシングルキャリア伝送、あるいはマルチキャリア伝送を行なうため、受信装置で受信される信号が、シングルキャリアとマルチキャリアが混在する環境を想定している。本発明は、上記の環境においても各ユーザの信号を分離できる通信システムを実現するものである。
上記の第1の実施形態では、各ユーザのスペクトルがすべて重なる場合について説明を行なったが、第2の実施形態では、ある一部のスペクトルのみでMIMO多重が行なわれる場合について説明を行なう。また、第2の実施形態では、シングルキャリア伝送としてClustered DFT-S-OFDM、マルチキャリア伝送として不連続帯域を用いたOFDMで説明を行なうが、他の方式を用いた場合においても本発明を実施することができる。
Claims (6)
- 複数の送信装置が少なくとも一つの受信装置に対して送信を行なうマルチユーザMIMO(Multiple Input Multiple Output)システムであって、
異なる伝送方式で無線送信を行なう複数の送信装置と、
前記各送信装置から無線送信された信号を受信し、前記受信した信号を前記送信装置毎に分離してデータを取得する少なくとも一つの受信装置と、から構成されることを特徴とするマルチユーザMIMOシステム。 - 前記送信装置は、システム帯域の一部の周波数帯域のみで多重を行ない、
前記受信装置は、前記システム帯域の一部の周波数帯域のみで多重された信号の分離を行なうことを特徴とする請求項1記載のマルチユーザMIMOシステム。 - 複数の送信装置が少なくとも一つの受信装置に対して送信を行なうマルチユーザMIMOシステムに適用される受信装置であって、
同一時刻かつ同一周波数で、異なる伝送方式によって送信された信号を受信する受信部と、
前記受信した信号を前記送信装置毎に分離するMIMO分離部と、
前記分離された信号の伝送方式に応じて、出力先を切り替える切り替え部と、
伝送方式毎に設けられ、前記切り替え部からの出力信号を、伝送方式に応じて処理する信号処理部と、を備えることを特徴とする受信装置。 - 前記MIMO分離部は、MMSE(Minimum Mean Square Error)重みを用いて信号を分離することを特徴とする請求項3記載の受信装置。
- 前記MIMO分離部は、MMSE重みを用いてシステム帯域の一部の周波数帯域のみで多重された信号の分離を行なうことを特徴とする請求項4記載の受信装置。
- 複数の送信装置が少なくとも一つの受信装置に対して送信を行なうマルチユーザMIMOシステムに適用される送信装置であって、
他の送信装置と同一時刻かつ同一周波数で、前記他の送信装置と異なる伝送方式によって、請求項3から請求項5のいずれかに記載の受信装置に対して無線信号を送信することを特徴とする送信装置。
Priority Applications (5)
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EP09823496.6A EP2352246B1 (en) | 2008-10-29 | 2009-10-20 | Multi-user mimo system, receiver apparatus and transmitter apparatus |
JP2010535762A JP5547648B2 (ja) | 2008-10-29 | 2009-10-20 | 送信装置、受信装置、送信方法、受信方法および通信システム |
US13/126,697 US8824600B2 (en) | 2008-10-29 | 2009-10-20 | Multiuser MIMO system, receiver, and transmitter |
CN2009801435328A CN102204139A (zh) | 2008-10-29 | 2009-10-20 | 多用户mimo系统、接收装置以及发送装置 |
ZA2011/03783A ZA201103783B (en) | 2008-10-29 | 2011-05-24 | Multiuser mimo system,receiver,and transmitter |
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JP2008-278544 | 2008-10-29 | ||
JP2008278544 | 2008-10-29 |
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US (1) | US8824600B2 (ja) |
EP (1) | EP2352246B1 (ja) |
JP (1) | JP5547648B2 (ja) |
KR (1) | KR20110079755A (ja) |
CN (2) | CN102204139A (ja) |
WO (1) | WO2010050384A1 (ja) |
ZA (1) | ZA201103783B (ja) |
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JPWO2019021574A1 (ja) * | 2017-07-25 | 2020-07-02 | 日本電気株式会社 | 無線通信装置、方法、プログラム、コンピュータに読み取り可能な非一時的記録媒体、及びシステム |
JP7052795B2 (ja) | 2017-07-25 | 2022-04-12 | 日本電気株式会社 | 無線通信装置、方法、プログラム、コンピュータに読み取り可能な非一時的記録媒体、及びシステム |
US11323215B2 (en) | 2017-07-25 | 2022-05-03 | Nec Corporation | Radio communication apparatus, method, program, non-transitory computer readable recording medium, and system |
US11962521B2 (en) | 2017-07-25 | 2024-04-16 | Nec Corporation | Radio communication apparatus, method, program, non-transitory computer readable recording medium, and system |
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JP5547648B2 (ja) | 2014-07-16 |
CN102204139A (zh) | 2011-09-28 |
CN107317612A (zh) | 2017-11-03 |
CN107317612B (zh) | 2021-01-29 |
EP2352246A4 (en) | 2014-07-02 |
US20110255624A1 (en) | 2011-10-20 |
EP2352246B1 (en) | 2019-07-17 |
US8824600B2 (en) | 2014-09-02 |
KR20110079755A (ko) | 2011-07-07 |
EP2352246A1 (en) | 2011-08-03 |
JPWO2010050384A1 (ja) | 2012-03-29 |
ZA201103783B (en) | 2012-07-25 |
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