WO2006064857A1 - マルチアンテナ伝送における再送方法及び送信方法 - Google Patents
マルチアンテナ伝送における再送方法及び送信方法 Download PDFInfo
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- WO2006064857A1 WO2006064857A1 PCT/JP2005/022982 JP2005022982W WO2006064857A1 WO 2006064857 A1 WO2006064857 A1 WO 2006064857A1 JP 2005022982 W JP2005022982 W JP 2005022982W WO 2006064857 A1 WO2006064857 A1 WO 2006064857A1
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- 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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
-
- 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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
-
- 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
-
- 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
- H04B7/0602—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 antenna switching
- H04B7/0608—Antenna selection according to transmission parameters
- H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side
-
- 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
-
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
-
- 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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
-
- 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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
-
- 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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
Definitions
- the present invention relates to a retransmission method and a transmission apparatus in multi-antenna transmission.
- MIMO multi-antenna
- signals are transmitted on the transmitting side using multiple antennas, and signals are received on the receiving side using multiple antennas.
- MIMO technology can significantly increase the channel capacity and increase the information transmission rate.
- spatial resources can be used almost indefinitely, so MIMO technology can overcome the bottlenecks of conventional technologies, and is a core technology for next-generation wireless communication systems. It is becoming.
- FIG. 1 shows a configuration of a normal MIMO system.
- signals are transmitted and received using n and n antennas on the transmitting side and the receiving side, respectively.
- the serial / parallel converter 101 converts the data waiting for transmission into serial Z / parallel conversion n data
- Each of n streams corresponds to one antenna
- these data Prior to transmission, these data are transmitted by the modulation and encoding units 102-l to 102-n.
- n antennas 104-1 to 104-n are used.
- the channel estimation unit 105 is based on the pilot signals of the received signals received by the antennas 104-1 to 104-n or by other methods.
- the MIMO detection unit 106 then performs a general estimation based on the channel characteristic matrix H estimated by the channel estimation unit 105.
- Each substream is detected by the interference cancellation detection method, and the original transmission data is obtained by demodulating the information bits transmitted by the transmission side. Detect substreams 1, 2, ..., n sequentially
- SINR (l), SINR (1),..., SINR (n) are calculated in advance.
- ⁇ [ ⁇ , ⁇ , ⁇ ] ⁇ is the zero mean value of nr receiving antennas.
- H is an nr X nt channel matrix.
- the signal In order to recover the transmission code s from the reception vector y, the signal must be detected using MIMO reception detection.
- Conventional detection methods include maximum likelihood detection, ZF detection, MMSE detection, and BLAST detection.
- the ZF detector has a problem that the background noise is increased at the same time as the force that can completely eliminate the interference between the transmitting antennas.
- the basic idea of the MMSE detector is to minimize the mean square error between the estimated data and the actual data. MMSE detector takes into account the effects of background noise
- the BLAST detectors (ZF—BLAST and MMSE—BLAST) are mainly composed of a linear converter and a series interference canceller force.
- the data decision of the I-th antenna which has the strongest signal-to-noise ratio, is obtained by linear transformation.
- the transmission data of the I-th antenna is reconstructed, and then the influence of the code is received from the received signal. except.
- the remaining day Calculate the data estimate for the antenna with the strongest signal-to-noise ratio and remove the interference. This operation is repeated until all data estimates are obtained.
- the radio channel is uncertain and easily changed due to the bad radio channel environment.
- the channel code is used to add redundant information to the original information so that error information can be detected and corrected on the receiving side.
- the error correction technique that is generally used is the hybrid repeat request (HARQ) technique.
- HARQ hybrid repeat request
- ARQ automatic repeat request
- FEC forward error correction technology
- the first type abandons packets that cannot be received correctly on the receiving side, sends a request to the sending side to resend a copy of the original packet based on feedback information, and independently decodes the newly received packet.
- decoding is performed by combining with the retransmitted information without giving up the wrong packet on the receiving side. This coupling is also called soft coupling.
- the retransmitted information and the previously transmitted packet may be combined, but the retransmitted packet contains all the information necessary to correctly receive the data.
- the transmitting side transmits encoded information to the receiving side, and the receiving side receives the information to perform error correction. If the information can be received correctly, the receiving side receives the information and sends the ACK receipt information to the transmitting side. If the error cannot be corrected, the receiving side sends NACK information and a request to retransmit the data to the transmitting side, and the retransmitted data received at the receiving side is decoded.
- the conventional HARQ technology retransmission method is adapted to a single antenna.
- the transmission reliability of the system is improved, There is a problem that the processing capacity cannot be improved Disclosure of the Invention
- An object of the present invention is to improve the reliability of data transmission in a MIMO system. Another object of the present invention is to provide a retransmission method and transmission apparatus in multi-antenna transmission that can improve the processing capacity of the system and can provide a retransmission technique adapted to multi-antenna transmission.
- the retransmission method in multi-antenna transmission includes a step of detecting reception quality of each substream from a reception signal, a step of feeding back the reception quality of each substream to a reception-side power transmission side, Selecting an antenna to be retransmitted for each substream based on the reception quality of each substream fed back on the transmission side, and retransmitting the substream on the transmission side using the selected antenna. It was made to have.
- the transmission apparatus of the present invention includes a conversion unit that converts transmission data into a plurality of parallel substreams, and the conversion so that the substream to be retransmitted is transmitted from an antenna different from the antenna at the previous transmission.
- Data rearranging means for rearranging the substreams converted in parallel by the means, and transmitting means for transmitting the substream rearranged by the data rearranging means from an antenna corresponding to each substream. Use the configuration that is provided.
- FIG. 1 Block diagram showing the configuration of a normal MIMO system
- FIG. 3 is a block diagram showing the configuration of a MIMO system using HARQ technology according to Embodiment 1 of the present invention.
- FIG. 4 is a flowchart showing a retransmission process in the fixed detection order according to Embodiment 1 of the present invention.
- FIG. 5 is a block diagram showing a configuration of a MIMO system of HARQ technology according to Embodiment 2 of the present invention.
- FIG. 6 is a flowchart showing a retransmission process based on a variable detection order according to Embodiment 2 of the present invention.
- the present invention combines HARQ technology and MIMO technology, and improves the characteristics of the MIMO system by HARQ technology.
- FIG. 2 is a flowchart of the SIC detection method according to the first embodiment.
- step 201 detection starts.
- step 202 based on the current channel characteristic matrix H, the first transmission substream is detected from the entire received signal by the detector ZF or MMSE. If detected, in step 203, the total received signal power also removes the effect of the first transmission substream.
- step 204 the next transmission substream is detected again by the detector after the reception signal from which the transmission substream has been removed. If detected, in step 205, the overall received signal power also removes the effect of this transmitted substream. In step 206, it is determined whether or not the detection of the transmission substream is completed.
- step 206 If it is determined in step 206 that sub-stream detection has not been completed, the flow returns to step 204 to continue detection. until the nth substream is detected
- step 207 the detection is terminated in step 207.
- FIG. 3 is a block diagram showing the configuration of the HARQ technology MIMO system according to Embodiment 1 of the present invention.
- the signal is transmitted by n and n antennas on the transmitting side and the receiving side, respectively.
- serial Z parallel conversion unit 300 which is a conversion means, serial / parallel converts the data waiting for transmission and divides it into n data substreams.
- Reordering section 301 reorders n data substreams based on the feedback information.
- CRC encoding sections 302-1 to 302-n perform CRC encoding on each substream.
- Each substream corresponds to one transmit antenna and one independent ARQ process. Then, the modulation and code key sections 303-1 to 303-n are used for the corresponding data sources.
- n transmit antennas 304—l to 304—n are Data substream.
- n antennas 305-1 to 305-n receive all signals in space.
- the channel estimation unit 306 estimates the current channel characteristic matrix H by performing channel estimation based on the pilot signal of the received signal or by another method.
- MIMO detection section 307 serving as a substream detection means detects each substream by a general interference cancellation detection method based on channel characteristic matrix H, and detects each substream after detection. Get the equivalent SINR value. Information on these equivalent SINR values is fed back to the transmission side via the feedback channel 311 as reception quality information.
- CRC calibration unit 308—1 to 308—n performs CRC calibration on the detected data substream and performs calibration
- the result is sent to the feedback information processor 310.
- the feedback information processor 310 generates feedback information of each substream and feeds it back to the transmission side via the feedback channel 311.
- Substream detection employs a detection method based on SIC (serial interference cancellation).
- SIC detection is to use a detector (for example, a detector for the maximum likelihood detection method, a detector for the MMS E (minimum mean square error) detection method, or a detector for the ZF (ZERO FORCING) detection method). Is used to detect one transmitted substream and then remove the effect of this substream from the entire received signal to detect the next substream and detect all the further substreams. Repeat until you can.
- SINR (1) SINR (1)
- the channel noise estimate is calculated based on the received signal, which is a superposition of the useful signal and noise, and the power of the useful signal is known. Therefore, channel noise can be calculated from the received signal.
- MIMO detection is performed in a fixed substream detection order. For example, SIC detection and SINR calculation are performed for each substream in the order of transmission antennas 1 to n. Same
- MIMO detection also performs the detection of each substream in the same order to obtain the final data.
- Equivalent SINR obtained by detecting each substream is transmitted to the transmission side via the feedback channel.
- error correction is performed on the final data obtained by detecting each substream, and if the data is not received correctly, a request for retransmission is sent to the transmitting side.
- the transmission side based on the equivalent SINR value of each substream, it is determined which antenna is selected for data retransmission.
- the principle for selecting an antenna is that if the SINR value of the antenna used for the first transmission is high, an antenna with a low SINR value is selected for retransmission, whereas the antenna used for the first transmission is selected. When the S INR value is low, an antenna with a high SINR value is selected at the time of retransmission. For example, in the first transmission, the SINR value of the antenna used is compared with the threshold value, and in the second transmission, the data power where the SINR value is less than the threshold value. The power of the antenna that transmitted is retransmitted.
- the antenna with the SINR value n ⁇ L + 1st is selected during retransmission.
- the equivalent SINR values for the first data transmission will be 3, 1, 4, 2 (when they are arranged in ascending order).
- the SINR value of the received data substream can be brought close to a balanced value, and the average error code rate performance of the system can be improved.
- FIG. 4 is a flowchart of a retransmission process according to the fixed detection order of the present invention.
- the flow starts at step 401, the equivalent SINR value after detection of each substream received at step 402 is calculated at the reception side, and the equivalent SINR value after detection is calculated at step 403 at the transmission side.
- the receiving side continues to error-correction the detected data, and in step 405, it is determined whether there is an error in the data received by one or more antennas. If it is determined in step 405 that there is an error, a request for resending data is sent to the transmitting side in step 406.
- step 410 If there is no error in the received data, the flow is terminated by step 410, which does not require retransmission.
- step 407 When retransmitting data, in step 407, it is necessary to rearrange the equivalent SINR values of the data substreams returned to the reception side in the order of small, large or large.
- step 408 if the rank of the SINR value of the erroneous data substream is L and the total transmission stream is n, the antenna having the rank of the SINR value is n ⁇ L + 1.
- step 409 the wrong data is retransmitted.
- Embodiment 1 since the antenna to be transmitted is changed based on the equivalent SINR at the time of retransmission of the data substream, the reliability of data transmission in the MIMO system is improved. As well as improving the processing capacity of the system, it is possible to provide a retransmission technique adapted to multi-antenna transmission.
- FIG. 5 is a block diagram showing a configuration of a HARQ technology MIMO system according to Embodiment 2 of the present invention.
- the HARQ technology MIMO system according to the second embodiment is similar to the HARQ technology MIMO system according to the first embodiment shown in FIG. 3! /, And as shown in FIG. Except for the MIMO detection unit 307, a MIMO detection unit 501 is provided.
- the same components as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.
- the SIC detection method of the second embodiment is the same as that in FIG. [0043]
- MIMO detection section 501 selects a detection order different from the detection order at the previous reception, and detects the data substream.
- the detection order of substreams is the SINR after detection of each substream. Affect. Therefore, by optimizing the substream, the SINR after detection of each substream can be improved, so the BER performance of the system can also be improved.
- FIG. 6 is a flowchart of a retransmission process using a variable detection order according to the second embodiment.
- step 601 a predetermined detection order is selected on the receiving side, for example, the order of 3, 2, 1, and 4.
- step 603 data substreams are detected in the selected detection order.
- step 604 After detecting the substream, in step 604, the data of each substream obtained by the detection is subjected to error correction decoding, and in step 605, whether or not there is an error in the data of each substream. Judging.
- step 606 the wrong data substream is retransmitted to the transmission side. Send a request.
- step 607 the erroneous data substream is retransmitted by the same antenna as the previous one.
- step 608 the data substream retransmitted on the receiving side is received, and the detection order opposite to the previous detection order is selected, that is, the previous time is 3, 2, 1, 4 ( If these numbers are detected in the order of antennas), select the order of 4, 1, 2, 3 this time. The flow then returns to step 604 and continues until the correct data is detected.
- the receiving side may select a random detection order! /. That is, re-detection is performed by selecting a random order other than 3, 2, 1, and 4. According to this, the effect of balancing SINR values of similar data substreams can be obtained.
- the original detection order is changed.
- detection order is a method in which detection is performed in the reverse order of the original detection order, and another detection is performed in a random detection order.
- the first detection order is 1, 2, 3, and 4
- the second detection may be performed in the order of 4, 3, 2, and 1, and the next transmission will continue.
- the order 1, 2, 3, 4 may be used. This method has the effect of balancing similar data substreams.
- the random detection order the first detection order is 1, 2, 3, 4; the second detection order is 3, 1, 2, 4; the third detection order is 4, 1, 2, 3 Detection may be performed with
- the order of data substream detection is changed when the data substream is retransmitted, and the order of power at the time of the previous reception is changed, so that the reliability of data transmission in the MIMO system is improved.
- the processing capability of the system can be improved, and a retransmission technique adapted to multi-antenna transmission can be provided.
- the present invention is not limited to this, and the second embodiment is applied to the first embodiment.
- the transmission antenna may be changed at the time of retransmission.
- Embodiment 1 and Embodiment 2 described above are embodiments of the present invention that do not limit the present invention.
- the present invention can easily be adapted to different types of equipment.
- the descriptions of the first embodiment and the second embodiment of the present invention are for the purpose of explaining the present invention rather than limiting the scope of the claims, and those skilled in the art will be able to make various substitutions and modifications.
- the retransmission method and transmission apparatus for multi-antenna transmission according to the present invention are particularly suitable for multi-antenna transmission.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US11/721,911 US7826557B2 (en) | 2004-12-17 | 2005-12-14 | Retransmitting method and transmitting method in multi-antenna transmission |
CN2005800431603A CN101080893B (zh) | 2004-12-17 | 2005-12-14 | 用于多天线传输的重传方法及发送装置 |
EP05816694A EP1821440A4 (en) | 2004-12-17 | 2005-12-14 | RETRANSMISSION METHOD AND TRANSMISSION METHOD IN MULTI-ANTENNA TRANSMISSION |
JP2006548891A JP4863884B2 (ja) | 2004-12-17 | 2005-12-14 | マルチアンテナ伝送における再送方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CNA2004101045326A CN1790976A (zh) | 2004-12-17 | 2004-12-17 | 用于多天线传输中的重传方法 |
CN200410104532.6 | 2004-12-17 |
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WO2006064857A1 true WO2006064857A1 (ja) | 2006-06-22 |
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PCT/JP2005/022982 WO2006064857A1 (ja) | 2004-12-17 | 2005-12-14 | マルチアンテナ伝送における再送方法及び送信方法 |
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US (1) | US7826557B2 (ja) |
EP (1) | EP1821440A4 (ja) |
JP (1) | JP4863884B2 (ja) |
KR (1) | KR100912762B1 (ja) |
CN (1) | CN1790976A (ja) |
WO (1) | WO2006064857A1 (ja) |
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WO2009104574A1 (ja) * | 2008-02-21 | 2009-08-27 | シャープ株式会社 | 送信装置、受信装置、通信システム及び通信方法 |
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JPWO2009104574A1 (ja) * | 2008-02-21 | 2011-06-23 | シャープ株式会社 | 送信装置、受信装置、通信システム及び通信方法 |
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US8381060B2 (en) | 2008-05-15 | 2013-02-19 | Sharp Kabushiki Kaisha | Communication device, communication system, reception method, and communication method |
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Also Published As
Publication number | Publication date |
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CN1790976A (zh) | 2006-06-21 |
KR100912762B1 (ko) | 2009-08-18 |
EP1821440A4 (en) | 2012-04-25 |
JP4863884B2 (ja) | 2012-01-25 |
EP1821440A1 (en) | 2007-08-22 |
US20090252236A1 (en) | 2009-10-08 |
US7826557B2 (en) | 2010-11-02 |
JPWO2006064857A1 (ja) | 2008-06-12 |
KR20070086267A (ko) | 2007-08-27 |
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