WO2012010017A1 - Procédé et système permettant de mettre en oeuvre une sélection d'antennes dans un système de relais entrée multiple sortie multiple - Google Patents
Procédé et système permettant de mettre en oeuvre une sélection d'antennes dans un système de relais entrée multiple sortie multiple Download PDFInfo
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- WO2012010017A1 WO2012010017A1 PCT/CN2011/075524 CN2011075524W WO2012010017A1 WO 2012010017 A1 WO2012010017 A1 WO 2012010017A1 CN 2011075524 W CN2011075524 W CN 2011075524W WO 2012010017 A1 WO2012010017 A1 WO 2012010017A1
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- antenna
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- source node
- relay
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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
- H04B7/0602—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
Definitions
- the present invention relates to the field of communications, and in particular to a method and system for implementing antenna selection in a multiple input multiple output (MIMO) relay system.
- MIMO multiple input multiple output
- the relay technology improves the transmission rate and transmission reliability of the wireless link by deploying several relays near the transmitting node and the receiving node, and can increase the coverage and robustness of the system.
- the technology By making full use of the broadcast characteristics of the wireless channel, the technology not only reduces the power consumption and bandwidth of the terminal node, but also significantly improves the spectrum efficiency, throughput, and capacity of the system without increasing system complexity.
- Relay technology has broad application prospects in wireless sensor network (WSN), wireless Ad Hoc network, wireless Mesh network, and cellular network, and will become the key technology for the integration of multiple heterogeneous networks in next-generation wireless communication systems.
- WSN wireless sensor network
- AF Amplification and Forwarding
- DF Decoding and Forwarding
- the relay node of the AF protocol does not need to be decoded, and only needs to amplify and forward the received signal.
- the relay node of the DF protocol needs to decode and re-encode the received signal.
- the relay node needs to perform cyclic redundancy check (CRC) on the data after decoding. If the verification is successful, the relay participates in the cooperative transmission, otherwise it does not participate.
- CRC cyclic redundancy check
- BF beamforming
- CSI channel state information
- the first thing is to require the receiving node to accurately estimate the CSI, and use the optimization algorithm to find The best transmitted signal vector. This will greatly increase the design complexity of the receiving node; in addition, since the BF technology requires the transmitting node to use all the antennas to simultaneously transmit signals, the transmitting node is required to have not only multiple antennas but also multiple RF links. The cost is too high. Summary of the invention
- the main object of the present invention is to provide a method and system for implementing antenna selection in a MIMO relay system, which both ensure that a transmitting node selects only one antenna from multiple antennas to transmit signals, resulting in significantly less than conventional BF technology.
- the amount of feedback information on the solution reduces design complexity.
- a method for implementing antenna selection in a multiple input multiple output MIMO relay system comprising:
- the relay node and the source node respectively use the notified transmit antenna for signal transmission.
- the process of selecting a transmit antenna for the relay node includes:
- the destination node measures channel quality of each antenna group or group of antennas of the relay node to the destination node, and selects an antenna or an antenna group of the relay node corresponding to the optimal channel quality, as the transmitting antenna selected by the relay node;
- the process of selecting a transmit antenna for a source node includes:
- Manner 1 The destination node obtains the equivalent channel quality of the antenna or antenna group of each or each group of antennas of the source node and the selected relay node, and selects the source node corresponding to the optimal equivalent channel quality.
- Antenna or antenna group as the transmit antenna selected by the source node; or, mode 2: The destination node measures the channel quality of each or each group of antennas of the source node to the destination node, and selects the antenna of the source node corresponding to the optimal channel quality or Antenna group, a transmit antenna selected as a source node; or
- the relay node measures the channel quality of each or each group of antennas of the source node to the relay node, The antenna or antenna group of the source node corresponding to the optimal channel quality is selected as the transmit antenna selected by the source node.
- the process of selecting a transmit antenna for a relay node includes:
- the second method includes: the source node sends antenna broadcasts from the first " 1 ⁇ ⁇ A ⁇ " groups/groups
- X [X 1 , --, X ! , --X .
- the relay node estimates the channel, and the destination node estimates the channel and the received SNR;
- the method further includes: determining, according to the diversity gain order that can be obtained, the transmit antenna selection by the destination node or the relay node as the source node.
- the diversity gain order when the destination node selects the transmit antenna as the source node, the diversity gain order can be obtained as ⁇ + ⁇ ; when the relay node selects the transmit antenna as the source node, the diversity gain order that can be obtained is N D + N R Ns , N D , .,
- the process of determining the transmit antenna selection by the destination node or the relay node as the source node includes: If ⁇ NN ⁇ ( NN u, , , the destination node is the source node for transmitting antenna selection Otherwise, the transmit node is selected by the relay node for the source node.
- the index of the selected transmitting antenna is specified.
- a system for implementing antenna selection in a ⁇ relay system comprising a transmit antenna selection unit, a source node, and a destination node;
- the transmitting antenna selecting unit is configured to select a transmitting antenna for the relay node and the source node according to the signal to noise ratio, and notify the selected relay antenna and the source node respectively to the selected transmitting antenna; the relay node and the source A node, configured to perform signal transmission using the notified transmit antenna, respectively.
- the transmitting antenna selecting unit when selecting a transmitting antenna for the relay node, is configured to: measure channel quality of each antenna group or each group of antennas to the destination node, and select an optimal one.
- the transmit antenna selection unit is used to:
- Application mode 1 Obtain the equivalent channel quality of the antenna or antenna group of each or each group of antennas of the source node and the selected relay node, and select the antenna of the source node corresponding to the optimal equivalent channel quality. Or an antenna group, a transmit antenna selected as a source node;
- the channel quality of each source group or groups of antennas of the source node is measured, and the antenna or antenna group of the source node corresponding to the optimal channel quality is selected as the transmit antenna selected by the source node;
- Application mode 3 Measure the channel quality of each or each group of antennas from the source node to the relay node, and select the antenna or antenna group of the source node corresponding to the optimal channel quality as the transmit antenna selected by the source node.
- the transmit antenna selection unit includes a relay node side antenna selection unit and a destination node side antenna selection unit;
- the relay node side antenna selection unit is disposed in the relay node, configured to select a transmit antenna for the source node, and notify the corresponding source node of the selected transmit antenna;
- the destination node side antenna selection unit is disposed in the destination node, configured to select a transmit antenna for the relay node and the source node, and notify the corresponding relay node and the source node respectively.
- the transmit antenna selection unit is further configured to: determine, according to the diversity gain order that can be obtained, the transmit antenna selection by the relay node side antenna selection unit or the destination node side antenna selection unit as the source node.
- the technology for implementing antenna selection in the MIMO relay system can ensure that the relay node and the source node as the transmitting node select only one antenna to transmit signals, which can generate feedback that is significantly less than the traditional BF technical solution.
- the amount of information can effectively reduce the complexity of the design Degree.
- FIG. 1 is a schematic diagram of a network model of a prior art MIMO relay system
- FIG. 2 is a flowchart of selecting an antenna for a relay node according to an embodiment of the present invention
- FIG. 3 is a flowchart of selecting an antenna for a source node according to an embodiment of the present invention.
- FIG. 4 is a flowchart of selecting an antenna for a source node according to still another embodiment of the present invention.
- FIG. 5 is a flowchart of selecting an antenna for a source node according to still another embodiment of the present invention.
- FIG. 6 is a schematic diagram of an antenna selection process of the present invention.
- FIG. 7 is a diagram of an antenna selection system according to an embodiment of the present invention. detailed description
- a transmit antenna selection operation based on limited feedback can be performed.
- the source node and the relay node have two or more antennas or antenna groups, you can do the following:
- the destination node performs a transmit antenna selection for the relay node, and indicates the selected transmit antenna index to the relay node; the destination node selects the transmit antenna for the source node, and indicates the selected transmit antenna index to the source node, or relays The node performs transmit antenna selection for the source node and indicates the selected transmit antenna index to the source node;
- the relay node performs signal transmission using the transmit antenna indicated by the destination node, and the source node performs signal transmission using the destination antenna or the transmit antenna indicated by the relay node.
- the destination node may measure the channel quality of each antenna group or group of antennas to the destination node, and select the relay corresponding to the optimal channel quality.
- the antenna or antenna group of the node acts as the selected transmit antenna of the relay node and indicates to the relay node the index of the selected transmit antenna.
- the destination node When the destination node is the source node for transmitting antenna selection, the destination node can obtain the source node. Selecting the equivalent channel quality of each or each group of antennas and the antenna or antenna group of the selected relay node for cooperative transmission, and selecting the antenna or antenna group of the source node corresponding to the optimal equivalent channel quality as the source node Selecting a transmit antenna and indicating to the source node an index of the selected transmit antenna.
- the destination node may also measure channel quality of each or each group of antennas of the source node to the destination node, and select an antenna or an antenna group of the source node corresponding to the optimal channel quality as the selected transmit antenna of the source node, and A node indicates an index of the selected transmit antenna.
- the relay node may measure channel quality of each antenna group or group of antennas of the source node to the relay node, and select an antenna or antenna of the source node corresponding to the optimal channel quality.
- the group acts as a selected transmit antenna for the source node and indicates to the source node the index of the selected transmit antenna.
- the relay node and the destination node may determine whether the destination node or the relay node is the source node for transmitting antenna selection according to the diversity gain order that can be obtained.
- the diversity gain order that can be obtained is N S N D + N
- the diversity gain order can be obtained when the relay node selects the transmit antenna for the source node. Number is
- the transmit antenna selection unit can be performed by the transmit antenna selection unit.
- the specific execution unit is the relay node side antenna selection unit or the destination node side antenna selection unit.
- the channel quality or equivalent channel quality includes at least one of SNR, Signal to Interference and Noise Ratio (SINR), and Channel State Indication (CSI); the channel quality is optimal, which means that the SNR, SINR, or CSI value is the largest.
- SINR Signal to Interference and Noise Ratio
- CSI Channel State Indication
- FIG. 2 is a flowchart of selecting an antenna for a relay node according to an embodiment of the present invention, where the process includes the following steps:
- Step 202 The destination node estimates the received signal to noise ratio of the signal transmitted by the kth/group transmission antenna of the relay node.
- Step 203 The destination node compares the signal to noise ratio with the decision threshold. Go to step 204; otherwise, go directly to step 205.
- Step 204 Update the selected antenna identification ⁇ and SNR decision threshold? ⁇ , the specific operation is as follows:
- Step 207 to step 208 Encoding ⁇ to obtain f', then modulating f' and feeding back the modulation result to the relay node.
- the destination node estimates the received SNR.
- FIG. 3 is a flowchart of selecting an antenna for a source node according to an embodiment of the present invention, where the process includes the following steps:
- Step 302 The destination node combines the received signal from the ith/group antenna of the source node with the signal forwarded from the Kth/group antenna of the relay node.
- Step 303 The destination node estimates the signal to noise ratio of the combined signal according to the result of the signal combination.
- Step 304 The destination node compares the signal to noise ratio with the decision threshold, if yes, proceeds to step 304; otherwise, directly proceeds to step 305.
- Step 304 Update the selected antenna identification I and the signal to noise ratio decision threshold? ⁇ , the specific operation is as follows:
- Step 307 to step 308 Encoding is performed, the modulation is performed, and the modulation result is fed back to the source node.
- the received signals can be expressed as y - T ⁇ pr y
- the relay node uses the formula ⁇ hTM) yTM'' and ⁇ to maximize the ratio combining of the received signals.
- the destination node calculates the MMSE combining coefficient using the formula w, where
- the destination node selects the largest one from ..., and finds the corresponding antenna or antenna group identifier.
- FIG. 4 is a flowchart of selecting an antenna for a source node according to still another embodiment of the present invention, where the process includes the following steps:
- Step 402 The destination node estimates the signal to noise ratio of the transmitted signal from the ith/group antenna of the source node.
- Step 403 The destination node compares the signal to noise ratio with the decision threshold. If > ⁇ , the process proceeds to step 404; otherwise, directly proceeds to step 405.
- Step 404 Update the selected antenna identification I and the signal to noise ratio decision threshold? ⁇ , the specific operation is as follows:
- Step 407 to step 408 Encoding / is performed to obtain g', modulating g' and feeding back the modulation result to the source node.
- the relay node estimates the channel, and the destination node estimates the channel ⁇ ⁇ and the received SNR ⁇
- the destination node selects the largest one from ,..., and finds the corresponding antenna or antenna group identifier.
- the paired binary data g is CRC encoded to obtain g', then BPSK is modulated on g' and the modulation result is fed back to the source node.
- FIG. 5 is a flowchart of selecting an antenna for a source node according to still another embodiment of the present invention, where the process includes the following steps:
- Step 502 The relay node estimates the signal to noise ratio of the transmitted signal from the ith/group antenna of the source node.
- Step 503 The relay node compares the signal to noise ratio with the decision threshold. If > ⁇ , the process proceeds to step 504; otherwise, directly proceeds to step 505.
- Step 504 Update the selected antenna identifier I and the signal to noise ratio decision threshold? ⁇ , the specific operation is as follows: I 1 ' Tmwi - .
- Step 507 Encoding / is performed to obtain g', and the modulation is performed and the modulation result is fed back to the source node.
- the destination node estimates the channel
- the relay node estimates the channel and the received SNR ⁇ .
- the relay node selects the largest one from ..., and finds the corresponding antenna or antenna group identifier I.
- the paired binary data g is CRC encoded to obtain g', then BPSK is modulated on g' and the modulation result is fed back to the source node.
- FIG. 6 is a schematic diagram of an antenna selection process according to the present invention.
- the process includes the following steps: Step 610: Select a transmit antenna for a relay node and a source node according to a signal to noise ratio, and notify the selected transmit antenna respectively.
- Step 610 Select a transmit antenna for a relay node and a source node according to a signal to noise ratio, and notify the selected transmit antenna respectively.
- Step 620 The relay node and the source node respectively use the notified transmit antenna to perform signal transmission.
- the selected antenna can be applied for data transmission.
- the destination node In the merge phase, the destination node combines the received signals with the estimated w, and the combined output is Second, the destination node pair performs demodulation to obtain received data.
- FIG. 4 and FIG. 5 respectively show two source node antenna selection methods, and their implementation complexity is the same, but according to the configured number of antennas or antenna groups, the available diversity gain order may be It is different.
- the diversity gain order obtained in Fig. 4 is ⁇ + ⁇
- the diversity gain order obtainable in Fig. 5 is ⁇ + ⁇ 111 ⁇ , ⁇ ).
- one of the above two source node antenna selection methods may be selected according to the number of antennas of the source node, the relay node, and the destination node.
- the diversity gain order obtained in Fig. 4 is 3; and the diversity gain order obtained in Fig. 5 is 2, so it can be selected as shown in Fig. 4.
- Method of operation In addition, the signal-to-noise ratio gain obtainable in Figure 4 is higher than that in Figure 5. Therefore, when the diversity gains of the above two source node antenna selection methods are the same, the operation method shown in FIG. 4 can be preferentially selected.
- FIG. 7 is a diagram of an antenna selection system according to an embodiment of the present invention.
- the system includes a transmit antenna selection unit, a source node, and a destination node.
- the transmitting antenna selecting unit can select a transmitting antenna for the relay node and the source node according to the signal to noise ratio, and respectively notify the selected transmitting antenna and the source node to the corresponding transmitting antenna; the relay node and the source node can Signal transmission is performed using the notified transmit antennas, respectively.
- the transmit antenna selection unit can be independently set or set in the relay node or the source node.
- the transmit antenna selection unit may include a relay node side antenna selection unit and a destination node side antenna selection unit.
- the relay node side antenna selection unit is disposed in the relay node, is capable of selecting a transmit antenna for the source node according to the signal to noise ratio, and notifying the selected source antenna to the corresponding source node; the destination node side antenna selection unit Set in the destination node, can be based on The signal-to-noise ratio selects the transmitting antenna for the relay node and the source node, and notifies the corresponding transmitting node and the source node respectively.
- the data transmission units respectively disposed in the relay node and the source node can perform the aforementioned data transmission processing in accordance with the notified transmission antenna selection.
- the source node may be a mobile phone as a user end, and the destination node may be a base station.
- the operations that can be implemented by the above units are described in detail in the foregoing various processes, and are not described herein again.
- the present invention implements antenna selection in a MIMO relay system, can ensure that the relay node and the source node as the transmitting node select only one antenna to transmit signals among multiple antennas. It can produce significantly less feedback information than the traditional BF technology solution, thus effectively reducing the design complexity.
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Abstract
La présente invention concerne un procédé et un système permettant de mettre en oeuvre une sélection d'antennes dans un système de relais MIMO (entrée multiple sortie multiple), des antennes de transmission destinées à un noeud de relais et à un noeud source pouvant être respectivement sélectionnées selon le rapport signal sur bruit ; le nœud de relais et le nœud source correspondants sont respectivement notifiés en ce qui concerne les antennes sélectionnées ; et les antennes de transmission notifiées sont utilisées respectivement par le nœud de relais et le nœud source pour transmettre le signal. Le procédé et le système selon la présente invention permettent tous deux d'assurer que le nœud de relais et le nœud source, qui agissent en tant que nœuds de transmission, ne sélectionnent qu'une seule antenne à partir d'antennes multiples pour transmettre le signal, et peuvent produire une quantité d'informations de retour beaucoup moins élevée que dans la solution de la technologie traditionnelle ; de cette manière, la complexité de la conception peut être diminuée de manière significative.
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CN2010102349057A CN102340340A (zh) | 2010-07-21 | 2010-07-21 | 在mimo中继***中实现天线选择的方法和*** |
CN201010234905.7 | 2010-07-21 |
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Cited By (2)
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US9942827B2 (en) | 2015-03-20 | 2018-04-10 | U-Media Communications, Inc. | Dynamic crossband link method and wireless extender |
US10405255B2 (en) | 2015-03-20 | 2019-09-03 | U-Media Communications, Inc. | Dynamic crossband link method and wireless extender |
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CN102780545B (zh) * | 2012-06-06 | 2014-12-03 | 西安电子科技大学 | 放大转发分布式协作***发射天线选择方法 |
CN103763015B (zh) * | 2014-02-10 | 2017-06-23 | 中国人民解放军理工大学 | 一种有直连链路的多天线中继网络中发送天线选择方法 |
CN104779987B (zh) * | 2015-04-17 | 2018-12-18 | 北京邮电大学 | 一种大规模多输入多输出通信***的中继传输方法 |
CN106603141B (zh) * | 2016-12-21 | 2020-01-10 | 北京邮电大学 | 一种面向全双工双向中继***的中继与天线联合选择方法 |
CN107592144B (zh) * | 2017-08-29 | 2020-06-19 | 广西师范大学 | Eh-mimo能量收集及多天线通信***的节点天线选择方法及装置 |
CN111989868B (zh) * | 2020-07-14 | 2023-08-29 | 北京小米移动软件有限公司 | 信息传输方法、装置、通信设备和存储介质 |
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