WO2006101180A1 - マルチユーザダウンリンクにおける時空間ブロックプレコーディング方法 - Google Patents
マルチユーザダウンリンクにおける時空間ブロックプレコーディング方法 Download PDFInfo
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- WO2006101180A1 WO2006101180A1 PCT/JP2006/305870 JP2006305870W WO2006101180A1 WO 2006101180 A1 WO2006101180 A1 WO 2006101180A1 JP 2006305870 W JP2006305870 W JP 2006305870W WO 2006101180 A1 WO2006101180 A1 WO 2006101180A1
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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
- H04B7/0615—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 weighted versions of same signal
- H04B7/0619—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 weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
-
- 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
-
- 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
Definitions
- the present invention relates to space-time block precoding for STBC (space-time block code) multi-users in multi-user MIMO communication.
- STBC space-time block code
- STC space-time coding
- This is a technique for performing diversity reception on the receiving side by performing reception, introducing time-domain and space-domain correlation between transmission signals of different antennas, and using two-dimensional information of time-domain and space-domain together.
- space-time codes can obtain higher coding gain without changing the bandwidth. If the receiver configuration is simple, the space-time configuration of the space-time code can effectively increase the capacity of the radio system.
- FIG. 1 is a diagram showing a configuration of a space-time code key system that is normally employed.
- data to be transmitted is processed by the space-time encoder 101 and transmitted from the transmission antenna 102.
- the receiving antenna 201 receives the data, the channel estimation module 202 estimates the channel matrix H based on the received data, and the time is based on the channel matrix H estimated by the channel estimation module 202.
- the spatial decoder 203 performs decoding of the space-time code and outputs estimated data.
- FIG. 2 is a block diagram of the space-time block code principle.
- the data is mapped to constellation by the modulation module 104 and becomes a transmission symbol.
- the transmission symbol is divided into a set of two symbols [c, c] by the space-time block encoder 101. Two symbols after space-time block code
- antennas transmit two symbols simultaneously.
- antenna 1 transmits c and antenna 2 transmits c.
- antenna 1 sends -c *.
- antenna 2 transmits c * (the superscript “*” means taking multiple conjugates).
- the symbols in all columns of the matrix are transmitted simultaneously from different antennas, and the constellation point symbol transmitted from one antenna power is orthogonal to the symbol transmitted from any other antenna. Specifically, it is shown in Table 1.
- the mobile terminal 20 can perform reliable detection with only one antenna (assuming that the time channel of these two characters does not change and the number of receiving antennas is 1).
- T is the symbol period.
- equation (2) can be rewritten as the following equation (3).
- Equation (3) the channel matrix H is defined as in the following Equation (4).
- H is an orthogonal matrix and satisfies the following equation (5).
- p
- I represents an identity matrix with N rows and columns (superscript "
- a maximum likelihood decoder is represented by the following equation (6).
- the receiving antenna 201 receives a signal
- the channel estimation module 202 estimates channels h and h
- two maximum likelihood linear decoders 204 are adjacent to each other.
- the demodulator module 205 then sends the signals of these two times
- the above method can also be applied to the case of using M antennas.
- the received vector of the mth receiving antenna is given by the following equation (9).
- the number of transmitting antennas is 2, so the number of users is limited to 1.
- DSTTD Double Space Transmitting Diversity
- signals of multiple users can be separated using a method combining the interference cancellation method and the maximum likelihood method.
- the number of users is K, interference can be eliminated if the receiving antenna of the base station is M ⁇ K.
- the number of users is 2, (the number of transmit antennas for all users is 2), it is sufficient if the number of antennas at the base station is 2.
- a system with two receiving antennas is constructed with the number of transmitting antennas.
- An object of the present invention is to provide a multi-user precoding method of a space-time block code that enhances downlink performance due to the characteristics of the space-time code in multi-user MIMO downlink communication.
- One aspect of the present invention includes a first step in which a base station acquires channel information of a plurality of user terminals, a second step of changing the channel information of the plurality of user terminals into a channel matrix, and the channel matrix. Based on the third step of obtaining a transformation matrix in which the result of multiplying the channel matrix becomes a block diagonal orthogonal matrix, and by taking the square of the elements on the diagonal of the block diagonal orthogonal matrix, each user terminal A fourth step of obtaining a normalization factor of the first step, a fifth step of performing a standardization process for each user symbol to be transmitted by the standardization factor, a conjugate transpose matrix of the block diagonal orthogonal matrix, and the transformation matrix. The sixth step of obtaining the processed symbol by multiplying the standardized symbol in order from the left side and the above processing by the space-time block coding rule. A seventh step that sends the symbols after the to have.
- Another object of the present invention is to provide a method of demodulating symbols encoded by the above method.
- FIG.6 Diagram showing matrix of multi-user space-time block precoding
- FIG. 7 Diagram showing comparison between Alamouti space-time block coding and space-time block precoding of the present invention.
- FIG. 3 is a configuration diagram of the present invention.
- the receiving antennas 304 of the mobile terminals 20A and 20B receive data, channel information is obtained by channel estimation of the channel estimation module 305, and the obtained channel information is transmitted to the base station via the feedback channel 307. Feedback to 10.
- the multi-user space-time block pre-encoder 302 acquires each user's data from the data source module 301, performs space-time block precoding, and the pre-coded data is transmitted from the transmission antenna 303. Sent.
- a signal is received from the receiving antenna 304, and the received signal is sent to the demodulation module 306 via the channel estimation module 305, and directly demodulated and transmitted to its own data. To do.
- FIG. 4 is a flowchart of the multiuser space-time block pre-encoder 302 on the base station side. Hereinafter, a specific example will be described.
- the number of users K 2
- the user has one antenna
- the number of antennas of the base station is 4, and two are distributed to each user.
- base station first and second antennas are distributed to user 1
- base station third and fourth antennas are distributed to user 2.
- step S401 the channel of each user is acquired and combined with the channel matrix ⁇ . This will be described in detail as follows.
- h is the channel between the base station first antenna and user 1's receive antenna.
- H is the channel between the base station second antenna and user 1's receive antenna
- g is the channel between the base station third antenna and user 1's receive antenna
- g is the channel between the base station 4th antenna and user 1's receive antenna.
- H, h, g, and g are channels for which the base station transmit antenna corresponds to user 2
- Equation (11) and (12) H, H, G, and G are all orthogonal matrices.
- step S402 a transformation matrix W is obtained based on the channel matrix H. This is explained by the following equation (13).
- T is also an orthogonal matrix (4 X 4). Then, the standardization factor f is obtained by the following equation (15).
- diag means to obtain a diagonal element.
- f (1.2492, 1.2492, 2
- f f is the square of the row reference value of the first row (or second row) of T
- f f is the square of the row reference value of the first row (or second row) of T.
- step S404 the symbol to be transmitted is standardized based on f to obtain y. This will be explained in detail as follows.
- the communication method is shown in Table 2.
- FIG. 5 is a flowchart of multiuser space-time block precoding reception, which is specifically shown as follows.
- step S501 corresponding to the demodulation module 306 in FIG. 3, data is received, demodulated, and output.
- the data received in symbol period 1 is directly demodulated.
- the data received in symbol cycle 2 is demodulated after obtaining the conjugate.
- x and x are data of user 1
- X and X are data of user 2.
- X, the value of X is f
- the two antenna forces distributed to the user 1 by the base station also transmit z and z, respectively, and the two antenna forces distributed by the base station to the user 2 respectively transmit z and z.
- the two antenna forces distributed to the user 1 by the base station also transmit -Z * and z *, respectively, and the two antenna forces distributed by the base station to the user 2 respectively.
- the processing for the signal received by user 2 is the same as that for user 1's received signal. In symbol period 1, the received signal r is directly demodulated, and in symbol period 2, the received signal is received.
- Each user has one receiving antenna, where ⁇ is the number of users.
- the base station side has two antennas, that is, two antennas are used for each user.
- the transmission method for all users is the Alamouti method, which is shown in Table 3. In Table 3,! /, T z and z are precoded symbols.
- the 1 is the received signal in symbol period 2, and r is user 2 in symbol period 1.
- Received signal, r assumes user 2 is the received signal in symbol period 1
- the precoding symbols transmitted by user 1 are c, c, and the precoding symbols transmitted by user 2.
- the received signal r is given by the following equation (19).
- Equation (20) If the matrix is W, W satisfies the following equation (20).
- Equation (20) T and T are
- Equation (22) is conditional on T and T being orthogonal matrices.
- equation (22) ⁇
- ABD is an orthogonal matrix such as Equation 4
- E AXBXD is an orthogonal matrix such as Equation (4).
- A is an orthogonal matrix like Eq. (4)
- B A_1 is an orthogonal matrix like Eq. (4).
- equation (22) becomes four equations, which are four unknown matrices
- T 2 G 2 -H 2 H ⁇ G X
- T ⁇ is an orthogonal matrix such as equation (4), so ⁇ ⁇ is a diagonal matrix.
- step S404 is required. As a result, what arrives at the receiving side becomes the original transmission symbol.
- the precoding matrix is as shown in Fig. 6. If the data symbol is X, the precoded symbol Z is expressed by the following equation (26).
- the purpose of obtaining Q is to obtain a pre-modulation effect on the spatio-temporal coat based on channel characteristics.
- T is a block diagonal matrix as shown in Equation (14). W eliminates another STTD interference.
- T (2 X 2) is an orthogonal matrix such as equation (4), there are six unknowns for W and there are six equations, so W can be solved.
- ⁇ is also an orthogonal matrix.
- the block diagonal elements shown in Eq. (28) are made into a unit matrix, W satisfying the requirements can be obtained.
- the unknown W and the equation are both ⁇ ( ⁇ -1).
- W is obtained, ⁇ is obtained according to equation (29).
- the matrix in Fig. 6 shows that it can be applied to any value of ⁇ (Equation (26)).
- FIG. 7 is a diagram comparing the Alamouti space-time code and the space-time precoding of the present invention.
- the number of users of the present invention is two.
- Es is the average power of the transmission symbol and N is the noise power.
- the code of the present invention is the code of the present invention.
- the present invention can be applied to downlink multi-user transmission by the spatio-temporal precoding method, and can improve the throughput amount of the system and improve the performance by utilizing the characteristics of the spatio-temporal code. .
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- Computer Networks & Wireless Communication (AREA)
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Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/909,385 US7668077B2 (en) | 2005-03-24 | 2006-03-23 | Time-space block precoding method in multi-user down link |
EP06729818A EP1850506A1 (en) | 2005-03-24 | 2006-03-23 | Time-space block precoding method in multi-user down link |
CN2006800096031A CN101147335B (zh) | 2005-03-24 | 2006-03-23 | 多用户下行链路中的空时分组预编码方法 |
JP2007509337A JP4709209B2 (ja) | 2005-03-24 | 2006-03-23 | マルチユーザダウンリンクにおける時空間ブロックプレコーディング方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNA2005100559774A CN1838556A (zh) | 2005-03-24 | 2005-03-24 | 一种下行多用户空时分组预编码的方法 |
CN200510055977.4 | 2005-03-24 |
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WO2006101180A1 true WO2006101180A1 (ja) | 2006-09-28 |
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PCT/JP2006/305870 WO2006101180A1 (ja) | 2005-03-24 | 2006-03-23 | マルチユーザダウンリンクにおける時空間ブロックプレコーディング方法 |
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US (1) | US7668077B2 (ja) |
EP (1) | EP1850506A1 (ja) |
JP (1) | JP4709209B2 (ja) |
CN (2) | CN1838556A (ja) |
WO (1) | WO2006101180A1 (ja) |
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JP2010537521A (ja) * | 2007-08-19 | 2010-12-02 | アルカテル−ルーセント | 複数の移動局から受信される信号間の干渉を消去するための方法及び装置 |
JP2013512614A (ja) * | 2009-11-25 | 2013-04-11 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | ファクタ化プリコーディングを使用するための方法と装置 |
JP2017147762A (ja) * | 2012-09-11 | 2017-08-24 | 株式会社Nttドコモ | 古いチャネル状態情報に基づいたmu−mimo送信スキームのための効率的なチャネル状態情報配布のための方法及び装置 |
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- 2006-03-23 CN CN2006800096031A patent/CN101147335B/zh not_active Expired - Fee Related
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- 2006-03-23 EP EP06729818A patent/EP1850506A1/en not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
CN101147335B (zh) | 2011-11-30 |
JP4709209B2 (ja) | 2011-06-22 |
CN101147335A (zh) | 2008-03-19 |
JPWO2006101180A1 (ja) | 2008-09-04 |
EP1850506A1 (en) | 2007-10-31 |
CN1838556A (zh) | 2006-09-27 |
US20090052354A1 (en) | 2009-02-26 |
US7668077B2 (en) | 2010-02-23 |
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