WO2008010284A1 - Démodulateur mimo et procédé - Google Patents
Démodulateur mimo et procédé Download PDFInfo
- Publication number
- WO2008010284A1 WO2008010284A1 PCT/JP2006/314424 JP2006314424W WO2008010284A1 WO 2008010284 A1 WO2008010284 A1 WO 2008010284A1 JP 2006314424 W JP2006314424 W JP 2006314424W WO 2008010284 A1 WO2008010284 A1 WO 2008010284A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- channel estimation
- estimation value
- channel
- data
- mimo
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
Links
Classifications
-
- 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
Definitions
- the present invention relates to a MIMO demodulator and a MIMO demodulator that perform channel separation of received data in a MIMO (Multi Input Multi Output) system that transmits multiple data with different transmit antenna power in the same band and receives them by multiple antennas. Regarding the method.
- MIMO Multi Input Multi Output
- S-PARC Selective Per-Antenna Rate Control
- the received SINR For a transmission antenna whose (SignaH: o- Interference and Noise power Ratio) is below the specified value, stop signal transmission and maintain the reception quality by putting the transmission power in the remaining transmission antenna. Control is performed.
- the channel estimation value is periodically calculated from the received data and used for channel separation calculation.
- linear interpolation of the calculated channel estimation value reduces the range of received data to which the same channel estimation value is applied.
- it requires a lot of computing resources.
- An object of the present invention is to provide a MIMO demodulator and a MIMO demodulation method capable of effectively utilizing the above computational resources in a MIMO system. Means for solving the problem
- a MIMO (Multi Input Multi Output) demodulator that performs channel separation of data transmitted from a plurality of transmitting antennas and received by a plurality of receiving antennas, channel estimation based on the received data
- the range of data to which the same channel estimation value is applied is changed according to the number of transmitting antennas transmitting data.
- an Ml MO demodulator comprising a channel estimation value adjustment circuit and a MIMO separator that performs MIMO separation of received data using a channel estimation value whose application data range is adjusted by the channel estimation value adjustment circuit.
- the channel estimation value adjustment circuit narrows a data range to which the same channel estimation value is applied when the number of transmission antennas is reduced.
- FIG. 1 is a diagram illustrating an example of a dredge system.
- FIG. 2 is a diagram for explaining an example of a frame configuration and a channel estimation value.
- FIG. 3 is a diagram for explaining a stop of transmission of a transmission antenna of a part.
- FIG. 4 is a diagram for explaining channel estimation values when transmission of some transmission antennas is stopped.
- FIG. 5 is a diagram illustrating a configuration of a receiver according to an embodiment of the present invention.
- FIG. 1 shows an example of a MIMO system to which the present invention is applied.
- a channel estimate that can be represented by a 4 X 4 matrix is calculated, V is used to perform channel separation of the received data, and the original data is restored.
- FIG. 2 shows an example of a frame configuration of data transmitted from the transmitter 10 to the receiver 16.
- One frame is composed of data CH (channel) 20 and preceding pilot CH 22.
- pilot signals having orthogonal (code) known powers of each transmitting antenna force are received at each receiving antenna in a multiplexed form.
- a complex number indicating the amplitude and phase of the pilot signal of each transmitting antenna force is determined, and the channel estimation value h is calculated by dividing these by the predetermined value.
- the channel estimation value 6 (n) used for channel separation of the data CH of the frame (n) that is the nth frame is the channel estimation value h (determined for the pilot CH of the nth frame.
- the average value ⁇ 0 (n) of the channel estimation values h (n + l) determined for n) and n + 1 first frame pilot CH! / is used.
- a calculation resource is prepared so that the channel separation calculation using the channel estimate 0 (n) is completed within one frame period.
- the transmission path estimation values required for the computation are h 1, h 2, h 3, h only
- the calculation amount is reduced, and a calculation resource is freed up.
- the period of the data CH20 is divided into four, and in each period, calculation is performed by linear interpolation from h (n) and h (n + 1).
- the four channel estimation values 6 0 (n), 6 1 ( ⁇ ), 2 (n), and 6 3 ( ⁇ ) are applied.
- ⁇ symbol period data in one frame is divided into four, and each ⁇ ⁇ ⁇ 4 symbol period data.
- the above four channel estimation values are applied sequentially.
- FIG. 5 shows an example of the configuration of the receiver 16 that realizes the above.
- the channel estimation unit 32 calculates a channel estimation value ⁇ 0 from the amplitude and phase of the pilot signal included in the reception data in the pilot CH period among the reception data obtained by the reception unit 30, and the linear interpolation unit 34 is linear.
- Channel estimation values ⁇ ⁇ , 6 1, 6 2 and ⁇ 3 are calculated by interpolation.
- Channel estimation value selection unit 36 selects channel estimation values 0, ⁇ 1, 6 2, and 3 obtained by linear interpolation of the preceding and following channel estimation values when the number of transmission antennas is one according to the number of transmission antennas. In other cases, the channel estimation value ⁇ 0 obtained by averaging the channel estimation values before and after is selected and given to the separation unit 38.
- ⁇ Separation unit 38 uses the channel estimation value selected by channel estimation value selection unit 36 to perform the MMSE (Minimum Mean Square Error) algorithm and MLD (Maximum Likelihood Detection) algorithm on the received data during the data CH period. : Separation of channels by applying a separation algorithm such as maximum likelihood detection.
- MMSE Minimum Mean Square Error
- MLD Maximum Likelihood Detection
- the number of transmission antennas used in the channel estimation value selection unit 36 the number of transmission antennas transmitted on the control channel from the transmission side can be used.
- the number of pit signals detected as having a correlation above the threshold may be used as the number of transmitting antennas.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06781379.0A EP2045943B1 (en) | 2006-07-20 | 2006-07-20 | MIMO receiver and method |
| JP2008525763A JP4689722B2 (ja) | 2006-07-20 | 2006-07-20 | Mimo復調器および方法 |
| PCT/JP2006/314424 WO2008010284A1 (fr) | 2006-07-20 | 2006-07-20 | Démodulateur mimo et procédé |
| US12/357,206 US8279961B2 (en) | 2006-07-20 | 2009-01-21 | MIMO demodulator and method for the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2006/314424 WO2008010284A1 (fr) | 2006-07-20 | 2006-07-20 | Démodulateur mimo et procédé |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US12/357,206 Continuation US8279961B2 (en) | 2006-07-20 | 2009-01-21 | MIMO demodulator and method for the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008010284A1 true WO2008010284A1 (fr) | 2008-01-24 |
Family
ID=38956621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2006/314424 Ceased WO2008010284A1 (fr) | 2006-07-20 | 2006-07-20 | Démodulateur mimo et procédé |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8279961B2 (ja) |
| EP (1) | EP2045943B1 (ja) |
| JP (1) | JP4689722B2 (ja) |
| WO (1) | WO2008010284A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010226723A (ja) * | 2009-03-24 | 2010-10-07 | Ntt Docomo Inc | 無線チャネル推定器 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8428538B2 (en) * | 2008-07-09 | 2013-04-23 | Intel Mobile Communications GmbH | Channel estimator |
| US8548511B2 (en) * | 2010-06-21 | 2013-10-01 | Qualcomm Incorporated | Energy saving mode with maintained number of advertised transmit antennas |
| US8837621B2 (en) * | 2011-05-09 | 2014-09-16 | Telefonaktiebolaget L M Ericsson (Publ) | Channel estimation for a very large-scale multiple-input multiple output (MIMO) system |
| KR101576347B1 (ko) | 2011-07-06 | 2015-12-09 | 후지쯔 가부시끼가이샤 | 기지국, 무선 단말기, 채널값 추정 방법, 파일럿 신호 송신 방법 및 무선 통신 시스템 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001189768A (ja) * | 1999-12-28 | 2001-07-10 | Matsushita Electric Ind Co Ltd | 同期検波装置 |
| JP2001522166A (ja) | 1997-10-27 | 2001-11-13 | シーメンス アクチエンゲゼルシヤフト | 無線通信システムにおける無線インタフェースを介してデータを伝送する方法および装置 |
| JP2003198426A (ja) * | 2001-12-27 | 2003-07-11 | Mitsubishi Electric Corp | 適応変調無線通信装置 |
| JP2003332955A (ja) * | 2002-05-17 | 2003-11-21 | Toshiba Corp | 無線送信装置及び無線通信システム |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2748743B2 (ja) * | 1991-10-01 | 1998-05-13 | 日本電気株式会社 | データ受信方式 |
| US20030012308A1 (en) * | 2001-06-13 | 2003-01-16 | Sampath Hemanth T. | Adaptive channel estimation for wireless systems |
| JP4668842B2 (ja) * | 2006-05-26 | 2011-04-13 | ソフトバンクBb株式会社 | 無線伝送システム、送信装置及び無線伝送方法 |
-
2006
- 2006-07-20 JP JP2008525763A patent/JP4689722B2/ja not_active Expired - Fee Related
- 2006-07-20 WO PCT/JP2006/314424 patent/WO2008010284A1/ja not_active Ceased
- 2006-07-20 EP EP06781379.0A patent/EP2045943B1/en not_active Ceased
-
2009
- 2009-01-21 US US12/357,206 patent/US8279961B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001522166A (ja) | 1997-10-27 | 2001-11-13 | シーメンス アクチエンゲゼルシヤフト | 無線通信システムにおける無線インタフェースを介してデータを伝送する方法および装置 |
| JP2001189768A (ja) * | 1999-12-28 | 2001-07-10 | Matsushita Electric Ind Co Ltd | 同期検波装置 |
| JP2003198426A (ja) * | 2001-12-27 | 2003-07-11 | Mitsubishi Electric Corp | 適応変調無線通信装置 |
| JP2003332955A (ja) * | 2002-05-17 | 2003-11-21 | Toshiba Corp | 無線送信装置及び無線通信システム |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP2045943A4 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010226723A (ja) * | 2009-03-24 | 2010-10-07 | Ntt Docomo Inc | 無線チャネル推定器 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4689722B2 (ja) | 2011-05-25 |
| JPWO2008010284A1 (ja) | 2009-12-17 |
| EP2045943A1 (en) | 2009-04-08 |
| US20090129498A1 (en) | 2009-05-21 |
| EP2045943A4 (en) | 2013-01-23 |
| EP2045943B1 (en) | 2016-08-17 |
| US8279961B2 (en) | 2012-10-02 |
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