CN107925452B - Method and apparatus for performing MU-MIMO transmission - Google Patents
Method and apparatus for performing MU-MIMO transmission Download PDFInfo
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Abstract
The invention discloses a method and a device for MU-MIMO transmission, which can reduce the system signaling overhead. The method comprises the following steps: the network equipment determines a channel matrix on a first subcarrier from each terminal equipment to the network equipment according to a data packet sent by each terminal equipment in a plurality of terminal equipments; the network device determines a downlink MU-MIMO orientation matrix of the plurality of terminal devices on the first subcarrier according to a channel matrix from each terminal device of the plurality of terminal devices to the network device on the first subcarrier.
Description
Technical Field
The present embodiments relate to the field of communications, and in particular, to a method and an apparatus for performing MU-MIMO transmission.
Background
In order to improve the data throughput of the system, a Wireless Local Area Network (WLAN) is introduced in the MU-MIMO (multi-User Multiple input Multiple Output) technology. In downlink MU-MIMO, an access point may transmit signals to multiple stations simultaneously. In addition, in order to avoid mutual interference between signals transmitted to multiple stations, the access point may perform Beamforming (Beamforming) on the transmitted signals, so that a signal transmitted to a certain station can be directionally transmitted to the station, and signals arriving at other stations are approximately zero. In the process of performing beamforming, a station may perform processing such as encoding and modulation on data to be transmitted of the multiple stations to obtain N data streams; the N data streams may then be subjected to spatial mapping (SpatialMapping) to obtain transmission signals of NTX transmit antennas, where beamforming is implemented in the process of performing spatial mapping.
In prior art beamforming techniques, an access point needs to know an accurate estimate of the channel used to transmit data in order to determine a directional matrix (which may also be referred to as a spatial mapping matrix) for transmitting data to multiple stations. The specific flow is shown in fig. 1, wherein in S110, the access point sends a Physical Protocol Data Unit (PPDU) in a downlink direction to each of the plurality of stations; in S120, after receiving the listening PPDU sent by the access point, the station may perform channel estimation according to the received listening PPDU, and feed back information such as a channel matrix from the access point to the station, a signal to noise ratio, and the like to the access point in S130; in S140, the access point may group the plurality of stations according to the information fed back by each of the plurality of stations, and calculate a directional matrix corresponding to each group, and then in S150, may perform MU-MIMO transmission to the grouped stations by using the directional matrix corresponding to a certain group. However, a plurality of listening PPDUs sent by the access point and feedback of each station all occupy channel resources, which results in a large signaling overhead.
Disclosure of Invention
The embodiment of the invention provides a method and a device for MU-MIMO transmission, which can save the system signaling overhead.
In a first aspect, a method for performing MU-MIMO transmission is provided, comprising: the network equipment determines a channel matrix on a first subcarrier from each terminal equipment to the network equipment according to a data packet sent by each terminal equipment in a plurality of terminal equipments; the network device determines a downlink MU-MIMO orientation matrix of the plurality of terminal devices on the first subcarrier according to a channel matrix from each terminal device of the plurality of terminal devices to the network device on the first subcarrier.
Therefore, in the method for performing MU-MIMO transmission according to the embodiment of the present invention, the network device determines, according to the data packet sent by each terminal device in the plurality of terminal devices, the channel matrix on the first subcarrier from each terminal device to the network device, and determines, according to the channel matrix on the first subcarrier from each terminal device in the plurality of terminal devices to the network device, the downlink MU-MIMO directional matrix on the first subcarrier from the plurality of terminal devices, which can avoid that the network device needs to send the listening data packet to the plurality of terminal devices respectively and the plurality of terminal devices need to feed back channel information to the network device in the prior art, thereby saving system signaling overhead and system resources.
In a first possible implementation manner of the first aspect, the determining, by the network device, a downlink MU-MIMO orientation matrix on the first subcarrier of the plurality of terminal devices according to a channel matrix from each of the plurality of terminal devices to the network device on the first subcarrier includes: determining a joint channel matrix of the plurality of terminal devices on the first subcarrier according to a channel matrix of each terminal device in the plurality of terminal devices to the network device on the first subcarrier; and determining a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier according to the joint channel matrix of the plurality of terminal devices on the first subcarrier.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the determining, according to a channel matrix from each of the multiple terminal devices to the network device on the first subcarrier, a joint channel matrix of the multiple terminal devices on the first subcarrier includes: performing uplink and downlink calibration processing on a channel matrix of each terminal device in the plurality of terminal devices to the network device on the first subcarrier to obtain a channel matrix of the network device to each terminal device on the first subcarrier; and determining a joint channel matrix of the plurality of terminal devices on the first subcarrier according to the channel matrix of each terminal device from the network device to the plurality of terminal devices on the first subcarrier.
With reference to the first or the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the determining, according to a channel matrix of each of the plurality of terminal devices to the network device on the first subcarrier, a joint channel matrix of the plurality of terminal devices on the first subcarrier includes: preprocessing a channel matrix of at least one first terminal device to the network device on the first subcarrier in the plurality of terminal devices to obtain a preprocessed channel matrix of the at least one first terminal device to the network device on the first subcarrier, wherein the plurality of terminal devices include the at least one first terminal device and zero or at least one second terminal device; and combining the preprocessed channel matrix of the network equipment from the at least one first terminal equipment to the first subcarrier and the channel matrix of the network equipment from the zero or at least one second terminal equipment to the first subcarrier to obtain a combined channel matrix of the plurality of terminal equipments on the first subcarrier.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the preprocessing includes at least one of the following processing: phase rotation processing, matrix transposition processing or matrix conjugate transposition processing, merging processing, SVD processing, and GMD processing for at least two rows or at least two columns of the channel matrix.
With reference to any one of the foregoing possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the determining, according to the joint channel matrix of the multiple terminal devices on the first subcarrier, a downlink MU-MIMO directional matrix of the multiple terminal devices on the first subcarrier includes: performing first processing on the joint channel matrix of the plurality of terminal devices on the first subcarrier, and determining the result of the first processing as a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier, wherein the first processing includes at least one of the following processing: matrix inversion processing, SVD processing and GMD processing.
With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the determining, according to the joint channel matrix of the multiple terminal devices on the first subcarrier, a downlink MU-MIMO directional matrix of the multiple terminal devices on the first subcarrier further includes: performing second processing on a result of the first processing, and determining a result of the second processing as a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier, wherein the second processing is different from the first processing, and the second processing includes at least one of the following processing: uplink and downlink calibration processing, SVD processing, GMD processing, phase rotation processing, matrix transposition processing and conjugate transposition processing.
With reference to any one of the foregoing possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the determining, according to a channel matrix from each of the plurality of terminal devices to the network device on the first subcarrier, a downlink MU-MIMO orientation matrix of the plurality of terminal devices on the first subcarrier includes: if the difference between the channel matrix of the third terminal device to the network device on the first subcarrier and the historical channel matrix of the third terminal device to the network device on the first subcarrier exceeds a threshold value, dividing the plurality of terminal devices into at least one group according to the channel matrix of each terminal device to the network device on the first subcarrier, wherein each group comprises at least two terminal devices; and determining a corresponding downlink MU-MIMO directional matrix of each packet on the first subcarrier according to a channel matrix from the terminal equipment of each packet to the network equipment in the at least one packet on the first subcarrier.
With reference to any one of the foregoing possible implementation manners of the first aspect, in an eighth possible implementation manner of the first aspect, the method further includes: determining a downlink MU-MIMO directional matrix of the plurality of terminal devices on at least one second subcarrier according to the data packet sent by each terminal device of the plurality of terminal devices; and performing interpolation processing on the downlink MU-MIMO directional matrixes of the plurality of terminal equipment on the first subcarrier and the at least one second subcarrier to obtain the downlink MU-MIMO directional matrixes of the plurality of terminal equipment on at least one third subcarrier.
In a second aspect, an apparatus for MU-MIMO transmission is provided for performing the method of the first aspect or any of its possible implementations.
In particular, the apparatus may comprise means for performing the method of the first aspect or any possible implementation manner of the first aspect.
In a third aspect, another apparatus for MU-MIMO transmission is provided, which includes a memory for storing instructions and a processor for executing the instructions stored in the memory, and execution of the instructions stored in the memory causes the processor to perform the first aspect or the method in any possible implementation manner of the first aspect.
In a fourth aspect, there is provided a computer readable medium for storing a computer program comprising instructions for carrying out the method of the first aspect or any possible implementation manner of the first aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for determining a downlink MU-MIMO orientation matrix in the prior art.
FIG. 2 is a system architecture diagram of an embodiment of the present invention.
Fig. 3 is a schematic flow chart of a method for MU-MIMO transmission according to an embodiment of the present invention.
Fig. 4 is a schematic block diagram of an apparatus for MU-MIMO transmission according to an embodiment of the present invention.
Fig. 5 is a schematic block diagram of another apparatus for MU-MIMO transmission according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
The technical scheme of the embodiment of the invention can be applied to various communication systems, such as: a global system for Mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) system, a Frequency Division Duplex (FDD) system, a Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for microwave Access (WiMAX) communication system, or a future 5G system.
Fig. 2 shows a Wireless communication system 200 applied in the embodiment of the present invention, where the Wireless communication system 200 may be a Wireless Local Area Network (WLAN) or other networks. The wireless communication system 200 may include at least one network device 210. Network device 210 may be a device that communicates with a terminal device. Each network device 210 may provide communication coverage for a particular geographic area and may communicate with terminal devices (e.g., UEs) located within that coverage area. The Network device 210 may be an Access point in a WLAN (e.g., WIFI), a Base Transceiver Station (BTS) in a GSM system or a Code Division Multiple Access (CDMA) system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB, or eNodeB) in an LTE system, a wireless controller in a Cloud Radio Access Network (CRAN), a relay Station, an Access point, a vehicle-mounted device, a wearable device, a Network side device in a future 5G Network, or a Network device in a future evolved Public Land Mobile Network (PLMN), and the like.
The wireless communication system 200 also includes a plurality of terminal devices 220 located within the coverage area of the network device 210. The terminal device 220 may be mobile or stationary. The terminal equipment 220 may refer to an access terminal, User Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication capability, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G Network, a terminal device in a future evolved Public Land Mobile Network (PLMN), or the like.
Fig. 2 exemplarily shows one network device and two terminal devices, and optionally, the wireless communication system 200 may include a plurality of network devices and may include other numbers of terminal devices within the coverage area of each network device, which is not limited in this embodiment of the present invention.
Optionally, the wireless communication system 200 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited thereto in the embodiments of the present invention.
The wireless communication system 200 may support downlink MU-MIMO, wherein the network device may transmit downlink data to a plurality of terminal devices by using a space division multiplexing technique, and for the specific content, reference may be made to IEEE 802.11ac, and for brevity, details are not described here again.
Fig. 3 illustrates a method 300 for MU-MIMO transmission according to an embodiment of the present invention. The method 300 may be applied to the wireless communication system 200 shown in fig. 2, but the embodiment of the present invention is not limited thereto.
S310, the network device determines, according to the data packet sent by each terminal device in the plurality of terminal devices, a channel matrix on the first subcarrier from each terminal device to the network device.
Optionally, the network device may specifically be an Access Point (AP), a base Station or a base Station controller, and the like, and the terminal device may specifically be a Station (STA), a UE, and the like, which is not limited in this embodiment of the present invention.
Assuming that the number of the plurality of terminal devices is M, the network device may receive a data packet sent by an ith terminal device in the M terminal devices in a channel, where i ═ 1.. multidot.m, and the data packet may carry uplink data or uplink signaling of the ith terminal device, for example, the data packet may specifically be a PPDU, but the embodiment of the present invention is not limited thereto. The network device may determine, according to the received data packet, a channel matrix of the ith terminal device to the network device on the first subcarrier, where a spectrum resource of the channel may be divided into a plurality of subcarriers, and the plurality of subcarriers include the first subcarrier. Specifically, the network device may perform channel estimation on an uplink channel between the i-th terminal device and the network device based on the received data packet, for example, perform channel estimation based on a Long Training Field (LTF) in a PPDU sent by the i-th terminal device, so as to obtain a channel matrix H of an uplink channel (or uplink of a channel) of the i-th terminal device and the network device on the first subcarrieriHowever, the embodiments of the present invention are not limited thereto.
S320, the network device determines, according to the channel matrix from each terminal device of the plurality of terminal devices to the network device on the first subcarrier, a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier.
The network device may set { H) according to the channel matrix of the M terminal devices to the network device on the first subcarrieriAnd determining a directional matrix of the network device when the network device transmits downlink data to the M terminal devices in a MU-MIMO mode. Optionally, the network device may determine a downlink MU-MIMO directional matrix for the M terminal devices; alternatively, the network device may divide the M terminal devices into at least one packet, wherein each packet includes the M terminal devicesMore than two terminal devices in the M terminal devices, and the network device can adopt a space division multiplexing mode to send downlink data to more than two terminal devices in the same group; the network device may then determine a downlink MU-MIMO orientation matrix for each of the at least one packet based on the channel matrices for the two or more terminal devices to the network device for that packet.
Optionally, the network device may determine, according to the historical grouping information of the M terminal devices, a group to which each terminal device in the M terminal devices belongs, for example, the network device may directly determine the historical group of the M terminal devices as the current group of the M terminal devices; alternatively, the network device may be based on the set of channel matrices { H }iI ═ 1.. multidata.,. M }, the M terminal devices are divided into at least one group, for example, when a difference between a channel matrix from a certain terminal device to the network device among the M terminal devices and a historical channel matrix from the terminal device to the network device exceeds a threshold, the network device regroups the M terminal devices, and determines a downlink MU-MIMO orientation matrix corresponding to the group according to a channel matrix on a first subcarrier from each of at least two terminal devices to the network device included in each group, which is redetermined, but the embodiment of the present invention is not limited thereto.
Optionally, the network device may also determine that the downlink MU-MIMO directional matrices of the M terminal devices need to be recalculated when a difference between a channel matrix from a certain terminal device to the network device in the M terminal devices and a historical channel matrix from the terminal device to the network device exceeds a threshold, that is, S320 is executed, but the embodiment of the present invention is not limited thereto.
Optionally, after determining the downlink MU-MIMO directional matrices of the M terminal devices, the network device may further process the downlink MU-MIMO directional matrices to determine a directional matrix corresponding to each terminal device in the M terminal devices, but the embodiment of the present invention is not limited thereto.
Therefore, according to the method for performing MU-MIMO transmission according to the embodiment of the present invention, the network device determines, according to the data packet sent by each of the plurality of terminal devices, the channel matrix on the first subcarrier from each of the plurality of terminal devices to the network device, and determines, according to the channel matrix on the first subcarrier from each of the plurality of terminal devices to the network device, the downlink MU-MIMO directional matrix on the first subcarrier from the plurality of terminal devices, which can avoid that the network device needs to send a sensing data packet to the plurality of terminal devices respectively and that the plurality of terminal devices need to feed back channel information to the network device in the prior art, thereby saving system signaling overhead and system resources.
In S320, the network device may determine the downlink MU-MIMO orientation matrix of the plurality of terminal devices in various ways. Optionally, the network device may determine, according to the channel matrix of each of the plurality of terminal devices to the network device on the first subcarrier, a channel matrix of each of the plurality of terminal devices to the network device on the first subcarrier, and determine, according to the channel matrix of each of the plurality of terminal devices to the network device on the first subcarrier, a downlink MU-MIMO orientation matrix of the plurality of terminal devices on the first subcarrier. That is, the network device may determine, according to a channel matrix of an uplink channel (i.e., an uplink of a channel) between the ith terminal device and the network device on the first subcarrier, a channel matrix of a downlink channel (i.e., a downlink of the channel) between the ith terminal device and the network device on the first subcarrier, and determine, according to a channel matrix of a downlink channel between each terminal device of the plurality of terminal devices and the network device on the first subcarrier, a directional matrix when the network device transmits downlink data to the plurality of terminal devices on the first subcarrier.
Optionally, the network device may determine a channel matrix of a downlink channel between a certain terminal device and the network device on a first subcarrier as a channel matrix of an uplink channel between the terminal device and the network device on the first subcarrier; alternatively, the network device may be configured to connect a terminal device and the network device in consideration of the difference between the uplink channel and the downlink channelThe channel matrix of the uplink channel between the terminal device and the network device on the first subcarrier is subjected to uplink and downlink calibration processing to obtain the channel matrix of the downlink channel between the terminal device and the network device on the first subcarrier. For example, the channel matrix H' of the downlink channel between the terminal device and the network device on the first subcarrier may be determined by the following equation: h ═ H*X C, wherein H*A conjugate transpose matrix of H, and a calibration matrix of C, which may have dimensions of NTx×NTx，NTxThe number of transmit antennas of the network device. The network device may obtain the calibration matrix from a factory configuration, or may also obtain the calibration matrix through training or other manners, but the embodiment of the present invention is not limited thereto.
As another optional embodiment, in S320, the network device may determine, according to a channel matrix of each of the plurality of terminal devices to the network device on the first subcarrier, a joint channel matrix of the plurality of terminal devices on the first subcarrier, and determine, according to the joint channel matrix of the plurality of terminal devices on the first subcarrier, a downlink MU-MIMO orientation matrix of the plurality of terminal devices on the first subcarrier.
The network device may determine the joint channel matrix of the plurality of terminal devices on the first subcarrier in a variety of ways. Optionally, the network device may perform a combining process on the channel matrix of each terminal device to the network device on the first subcarrier to obtain a joint channel matrix of the plurality of terminal devices on the first subcarrier. For example, the joint channel matrix H of the plurality of terminal devices on the first subcarrierunion＝[H1，...，Hi，...，HM]。
As another optional embodiment, the network device may also first perform preprocessing on a channel matrix on a first subcarrier from at least one first terminal device in the plurality of terminal devices to the network device to obtain a preprocessed channel matrix H' on the first subcarrier from each first terminal device in the at least one first terminal device to the network device, where the plurality of terminal devices may be composed of the at least one first terminal device and zero or at least one second terminal device; then, the network device may perform a combining process on the preprocessed channel matrix H' from each first terminal device to the network device on the first subcarrier and the channel matrix H from zero or at least one second terminal device to the network device on the first subcarrier to obtain a joint channel matrix of the plurality of network devices, which is not limited in this embodiment of the present invention.
Optionally, the pre-processing may comprise at least one of the following processes:
1. and combining at least two rows or at least two columns of the channel matrix H.
Specifically, assume that the dimension of the channel matrix H from a certain first terminal device to the network device on the first subcarrier is N1 × N2. Where N1 is the number of antennas of the AP, and N2 is the number of data streams transmitted by the first terminal device, where the number of data streams transmitted may be the number of transmit antennas of the first terminal device or other values. At least two columns of the channel matrix H may be merged to obtain H ', where the dimension of H' is N1 × N3, and N3 is the number of data streams of the first terminal device in downlink MU-MIMO. For example, the nth and n +1 columns of H may be merged to obtain a merged nth column, wherein the merged mth row and nth column of elements H'mnIs determined by the following formula: h'mn＝w1×Hmn+w2×Hm(n+1)Wherein w is1And w2The weights of the nth column and the (n + 1) th column elements, respectively, but the embodiment of the present invention is not limited thereto. Typically, H' ═ hxa, where a is a transformation matrix of N2 × N3.
2. And performing uplink and downlink calibration processing on the channel matrix H.
3. The channel matrix H is subjected to Singular Value Decomposition (SVD) or Geometric Mean Decomposition (GMD) or the like.
Specifically, in the GMD, H ═ U Σ V ×, where U is an mxm-order unitary matrix, Σ is an mxn-order diagonal matrix with the same non-0 diagonal elements, V ×, which is a conjugate transpose of V, is an nxn-order unitary matrix, and the V matrix is a processing result of the GMD processing.
4. And performing phase rotation processing on the channel matrix H.
The phase rotation process corresponds to rotating the channel matrix H by a certain angle on the complex plane. For example, H' ═ hxejx，ejxIs a complex number modulo 1.
5. And carrying out matrix transposition or conjugate transposition on the channel matrix H.
Alternatively, the network device may perform matrix transpose processing after combining at least two columns of the channel matrix H, or the network device may perform matrix transpose processing after performing matrix transpose processing on the channel matrix H, and then perform combining processing on at least two rows of the channel matrix after the transpose processing, but the embodiment of the present invention is not limited thereto.
Optionally, the pretreatment may also include other treatments, which is not limited in this embodiment of the present invention.
In this embodiment of the present invention, the network device may determine, according to the joint channel matrix of the plurality of terminal devices on the first subcarrier, a downlink MU-MIMO orientation matrix of the plurality of terminal devices on the first subcarrier. Optionally, the network device may perform a first process on the joint channel matrix, where the first process may include at least one of the following processes: inversion processing, SVD, GMD, or other processing, and taking the result of the first processing as the downlink MU-MIMO directional matrix, but the embodiment of the present invention is not limited thereto. Alternatively, the first process may be different from the pre-process, for example, if the pre-process includes an SVD process, the first process may not include the SVD process, and embodiments of the invention are not limited thereto.
As another optional embodiment, if the network device does not perform the above pre-processing on the channel matrix from at least one first terminal device of the plurality of terminal devices to the network device before determining the joint channel matrix of the plurality of terminal devices, the network device may perform a second processing (i.e., a post-processing) on a result of the above first processing (i.e., a first processing result) on the joint channel matrix, and use a result of the second processing as the downlink MU-MIMO orientation matrix of the plurality of terminal devices.
Optionally, the post-processing may include at least one of the following:
1. carrying out energy normalization processing on the first processing result Q;
specifically, the network device may scale rows or columns of the first processing result Q, so that a sum of squared modulus values of each row or column of the scaled matrix Q is less than or equal to a threshold, where the threshold may be predefined or configured according to an actual situation, which is not limited in this embodiment of the present invention.
2. Performing uplink and downlink calibration processing on the first processing result Q;
the first processing result Q obtained based on the channel matrix H of the uplink channel may be subjected to calibration processing in consideration of a difference between the uplink channel and the downlink channel. For example, Q' ═ C-1X Q, wherein C-1Is the inverse matrix of C.
3. Processing the first processing result Q by SVD or GMD and the like;
4. performing phase rotation processing on the first processing result Q;
5. and performing matrix transposition or conjugate transposition on the first processing result Q.
Optionally, the post-processing may further include other processing, and the post-processing may be different from the first processing or the preprocessing, that is, if the preprocessing performed by the network device on the channel matrix H from a certain terminal device to the network device includes uplink and downlink calibration processing, the post-processing may not include the uplink and downlink calibration processing, which is not limited in this embodiment of the present invention.
In embodiments of the present invention, the channel may be divided into multiple sub-carriers, for example, in a WLAN system of 802.11 protocol, a 20MHz channel is divided into 56 sub-carriers. At this time, the network device may repeat the operation of the first subcarrier on all other subcarriers in the channel to obtain the MU-MIMO orientation matrix of the plurality of terminal devices on each of the plurality of subcarriers of the channel. Or, in order to reduce the load, the network device may perform the above operations on only a part of subcarriers in the channel, and perform interpolation processing on the results obtained by the part of subcarriers to obtain a downlink MU-MIMO directional matrix of the plurality of terminal devices on another part of subcarriers, at this time, the network device may further determine, according to the received data packet sent by each terminal device of the plurality of terminal devices, a channel matrix of the each terminal device to the network device on at least one second subcarrier, and determine, according to the channel matrix of the each terminal device of the plurality of terminal devices to the network device on at least one second subcarrier, a downlink MU-MIMO directional matrix of the plurality of terminal devices on at least one second subcarrier, and perform interpolation processing on the downlink MU-MIMO directional matrices of the plurality of terminal devices on the first subcarrier and at least one second subcarrier, and obtaining a downlink MU-MIMO directional matrix of the plurality of terminal devices on at least one third subcarrier, wherein the plurality of subcarriers of the channel include the first subcarrier, at least one second subcarrier and at least one third subcarrier. For example, the network device determines, through the above-described procedure, the orientation matrices of the multiple terminal devices on subcarriers whose sequence numbers are integer multiples of 4 (i.e., sequence number 4k), and then performs interpolation processing on the orientation matrices to obtain the orientation matrices of the multiple terminal devices on subcarriers 4k +1, 4k +2, and 4k +3, respectively, but the embodiment of the present invention is not limited thereto.
It should be understood that the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present invention.
It should be further understood that, in the foregoing, with reference to fig. 3, the method for performing MU-MIMO transmission according to the embodiment of the present invention is described in detail from the perspective of a network device, and the embodiment on the terminal device side corresponds to the above-mentioned embodiment, and is not described herein again for brevity.
Fig. 4 illustrates an apparatus 400 for MU-MIMO transmission according to an embodiment of the present invention. As shown in fig. 4, the apparatus 400 includes:
a first determining unit 410, configured to determine, according to a data packet sent by each terminal device of the multiple terminal devices, a channel matrix on a first subcarrier from each terminal device to the network device;
a second determining unit 420, configured to determine, according to the channel matrix on the first subcarrier from each of the plurality of terminal devices to the network device determined by the first determining unit 410, a downlink MU-MIMO orientation matrix on the first subcarrier from the plurality of terminal devices.
Optionally, the second determining unit 420 is specifically configured to:
determining a joint channel matrix of the plurality of terminal devices on the first subcarrier according to a channel matrix of each terminal device in the plurality of terminal devices to the network device on the first subcarrier;
and determining a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier according to the joint channel matrix of the plurality of terminal devices on the first subcarrier.
Optionally, in the process of determining the joint channel matrix of the multiple terminal devices on the first subcarrier, the second determining unit 420 is specifically configured to:
performing uplink and downlink calibration processing on a channel matrix of each terminal device in the plurality of terminal devices to the network device on the first subcarrier to obtain a channel matrix of the network device to each terminal device on the first subcarrier;
and determining a joint channel matrix of the plurality of terminal devices on the first subcarrier according to the channel matrix of each terminal device from the network device to the plurality of terminal devices on the first subcarrier.
Optionally, in the process of determining the joint channel matrix of the multiple terminal devices on the first subcarrier, the second determining unit 420 is specifically configured to:
preprocessing a channel matrix of at least one first terminal device to the network device on the first subcarrier in the plurality of terminal devices to obtain a preprocessed channel matrix of the at least one first terminal device to the network device on the first subcarrier, wherein the plurality of terminal devices include the at least one first terminal device and zero or at least one second terminal device;
and combining the preprocessed channel matrix of the network equipment from the at least one first terminal equipment to the first subcarrier and the channel matrix of the network equipment from the zero or at least one second terminal equipment to the first subcarrier to obtain a combined channel matrix of the plurality of terminal equipments on the first subcarrier.
Optionally, the pre-processing comprises at least one of the following: phase rotation processing, matrix transposition processing or matrix conjugate transposition processing, merging processing, SVD processing, and GMD processing for at least two rows or at least two columns of the channel matrix.
Optionally, in the process of determining the joint channel matrix of the multiple terminal devices on the first subcarrier, the second determining unit 420 is specifically configured to:
performing first processing on the joint channel matrix of the plurality of terminal devices on the first subcarrier, and determining the result of the first processing as a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier, wherein the first processing includes at least one of the following processing: matrix inversion processing, SVD processing and GMD processing.
Optionally, after obtaining the result of the first processing, the second determining unit 420 is further configured to:
performing second processing on a result of the first processing, and determining a result of the second processing as a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier, wherein the second processing is different from the first processing, and the second processing includes at least one of the following processing: uplink and downlink calibration processing, SVD processing, GMD processing, phase rotation processing, matrix transposition processing and conjugate transposition processing.
Optionally, the second determining unit 420 is specifically configured to:
if the difference between the channel matrix of the third terminal device to the network device on the first subcarrier and the historical channel matrix of the third terminal device to the network device on the first subcarrier exceeds a threshold value, dividing the plurality of terminal devices into at least one group according to the channel matrix of each terminal device to the network device on the first subcarrier, wherein each group comprises at least two terminal devices;
and determining a corresponding downlink MU-MIMO directional matrix of each packet on the first subcarrier according to a channel matrix from the terminal equipment of each packet to the network equipment in the at least one packet on the first subcarrier.
Optionally, the second determining unit 420 is further configured to:
determining a downlink MU-MIMO directional matrix of the plurality of terminal devices on at least one second subcarrier according to the data packet sent by each terminal device of the plurality of terminal devices;
and performing interpolation processing on the downlink MU-MIMO directional matrixes of the plurality of terminal equipment on the first subcarrier and the at least one second subcarrier to obtain the downlink MU-MIMO directional matrixes of the plurality of terminal equipment on at least one third subcarrier.
Each component of the apparatus 400 for MU-MIMO transmission according to the embodiment of the present invention may implement the corresponding steps of the method described in fig. 3, and is not described herein again to avoid repetition.
Therefore, according to the apparatus for performing MU-MIMO transmission according to the embodiment of the present invention, the network device determines, according to the data packet sent by each of the plurality of terminal devices, the channel matrix on the first subcarrier from each of the plurality of terminal devices to the network device, and determines, according to the channel matrix on the first subcarrier from each of the plurality of terminal devices to the network device, the downlink MU-MIMO directional matrix on the first subcarrier from the plurality of terminal devices, which can avoid that the network device needs to send a sensing data packet to the plurality of terminal devices respectively and that the plurality of terminal devices need to feed back channel information to the network device in the prior art, thereby saving system signaling overhead and system resources.
Fig. 5 illustrates an apparatus 500 for MU-MIMO transmission according to an embodiment of the present invention. As shown in fig. 5, the apparatus 500 includes: a memory 510 and a processor 520, wherein the memory 510 is configured to store instructions and the processor 520 is configured to execute the instructions stored in the memory 510, and wherein execution of the instructions causes the processor 520 to:
determining a channel matrix on a first subcarrier from each terminal device to the network device according to a data packet sent by each terminal device in a plurality of terminal devices;
and determining a downlink MU-MIMO orientation matrix of the plurality of terminal devices on the first subcarrier according to the channel matrix from each terminal device in the plurality of terminal devices to the network device on the first subcarrier.
Optionally, the processor 520 is specifically configured to:
determining a joint channel matrix of the plurality of terminal devices on the first subcarrier according to a channel matrix of each terminal device in the plurality of terminal devices to the network device on the first subcarrier;
and determining a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier according to the joint channel matrix of the plurality of terminal devices on the first subcarrier.
Optionally, in the process of determining the joint channel matrix of the multiple terminal devices on the first subcarrier, the processor 520 is specifically configured to:
performing uplink and downlink calibration processing on a channel matrix of each terminal device in the plurality of terminal devices to the network device on the first subcarrier to obtain a channel matrix of the network device to each terminal device on the first subcarrier;
and determining a joint channel matrix of the plurality of terminal devices on the first subcarrier according to the channel matrix of each terminal device from the network device to the plurality of terminal devices on the first subcarrier.
Optionally, in the process of determining the joint channel matrix of the multiple terminal devices on the first subcarrier, the processor 520 is specifically configured to:
preprocessing a channel matrix of at least one first terminal device to the network device on the first subcarrier in the plurality of terminal devices to obtain a preprocessed channel matrix of the at least one first terminal device to the network device on the first subcarrier, wherein the plurality of terminal devices include the at least one first terminal device and zero or at least one second terminal device;
and combining the preprocessed channel matrix of the network equipment from the at least one first terminal equipment to the first subcarrier and the channel matrix of the network equipment from the zero or at least one second terminal equipment to the first subcarrier to obtain a combined channel matrix of the plurality of terminal equipments on the first subcarrier.
Optionally, the pre-processing comprises at least one of the following: phase rotation processing, matrix transposition processing or matrix conjugate transposition processing, merging processing, SVD processing, and GMD processing for at least two rows or at least two columns of the channel matrix.
Optionally, in the process of determining the joint channel matrix of the multiple terminal devices on the first subcarrier, the processor 520 is specifically configured to:
performing first processing on the joint channel matrix of the plurality of terminal devices on the first subcarrier, and determining the result of the first processing as a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier, wherein the first processing includes at least one of the following processing: matrix inversion processing, SVD processing and GMD processing.
Optionally, after obtaining the result of the first processing, the processor 520 is further configured to:
performing second processing on a result of the first processing, and determining a result of the second processing as a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier, wherein the second processing is different from the first processing, and the second processing includes at least one of the following processing: uplink and downlink calibration processing, SVD processing, GMD processing, phase rotation processing, matrix transposition processing and conjugate transposition processing.
Optionally, the processor 520 is specifically configured to:
if the difference between the channel matrix of the third terminal device to the network device on the first subcarrier and the historical channel matrix of the third terminal device to the network device on the first subcarrier exceeds a threshold value, dividing the plurality of terminal devices into at least one group according to the channel matrix of each terminal device to the network device on the first subcarrier, wherein each group comprises at least two terminal devices;
and determining a corresponding downlink MU-MIMO directional matrix of each packet on the first subcarrier according to a channel matrix from the terminal equipment of each packet to the network equipment in the at least one packet on the first subcarrier.
Optionally, the processor 520 is further configured to:
determining a downlink MU-MIMO directional matrix of the plurality of terminal devices on at least one second subcarrier according to the data packet sent by each terminal device of the plurality of terminal devices;
and performing interpolation processing on the downlink MU-MIMO directional matrixes of the plurality of terminal equipment on the first subcarrier and the at least one second subcarrier to obtain the downlink MU-MIMO directional matrixes of the plurality of terminal equipment on at least one third subcarrier.
It should be understood that, in the embodiment of the present invention, the processor 520 may be a Central Processing Unit (CPU), and the processor 520 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 510 may include both read-only memory and random-access memory, and provides instructions and data to the processor 520. A portion of memory 510 may also include non-volatile random access memory. For example, memory 510 may also store device type information.
Optionally, the apparatus further comprises a bus system, the memory and the processor being connected by the bus system. The bus system may include a power bus, a control bus, a status signal bus, and the like, in addition to the data bus.
In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 520. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 510, and the processor 520 reads the information in the memory 510 and performs the steps of the above method in combination with the hardware thereof. To avoid repetition, it is not described in detail here.
Each component of the apparatus 500 for performing MU-MIMO transmission according to the embodiment of the present invention may implement the corresponding steps of the method described in fig. 3, and is not described herein again to avoid repetition.
Therefore, according to the apparatus for performing MU-MIMO transmission according to the embodiment of the present invention, the network device determines, according to the data packet sent by each of the plurality of terminal devices, the channel matrix on the first subcarrier from each of the plurality of terminal devices to the network device, and determines, according to the channel matrix on the first subcarrier from each of the plurality of terminal devices to the network device, the downlink MU-MIMO directional matrix on the first subcarrier from the plurality of terminal devices, which can avoid that the network device needs to send a sensing data packet to the plurality of terminal devices respectively and that the plurality of terminal devices need to feed back channel information to the network device in the prior art, thereby saving system signaling overhead and system resources.
Further, the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Those of ordinary skill in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both, and that the steps and elements of the various embodiments have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (16)
1. A method for multi-user multiple-input multiple-output (MU-MIMO) transmission, comprising:
the method comprises the steps that a network device determines a channel matrix on a first subcarrier from each terminal device to the network device according to a data packet sent by each terminal device in a plurality of terminal devices;
the network equipment determines a downlink MU-MIMO directional matrix of the plurality of terminal equipment on the first subcarrier according to a channel matrix from each terminal equipment in the plurality of terminal equipment to the network equipment on the first subcarrier;
the network device determines, according to a channel matrix from each of the plurality of terminal devices to the network device on the first subcarrier, a downlink MU-MIMO directional matrix on the first subcarrier by the plurality of terminal devices, including:
determining a joint channel matrix of the plurality of terminal devices on the first subcarrier according to a channel matrix of each terminal device in the plurality of terminal devices to the network device on the first subcarrier;
and determining a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier according to the joint channel matrix of the plurality of terminal devices on the first subcarrier.
2. The method of claim 1, wherein the determining the joint channel matrix of the plurality of terminal devices on the first subcarrier from the channel matrix of each of the plurality of terminal devices to the network device on the first subcarrier comprises:
performing uplink and downlink calibration processing on a channel matrix on the first subcarrier from each terminal device to the network device in the plurality of terminal devices to obtain a channel matrix on the first subcarrier from the network device to each terminal device;
and determining a joint channel matrix of the plurality of terminal devices on the first subcarrier according to the channel matrix of each terminal device from the network device to the plurality of terminal devices on the first subcarrier.
3. The method of claim 1, wherein the determining the joint channel matrix of the plurality of terminal devices on the first subcarrier from the channel matrix of each of the plurality of terminal devices to the network device on the first subcarrier comprises:
preprocessing a channel matrix of at least one first terminal device to the network device on the first subcarrier in the plurality of terminal devices to obtain a preprocessed channel matrix of the at least one first terminal device to the network device on the first subcarrier, wherein the plurality of terminal devices include the at least one first terminal device and zero or at least one second terminal device;
and combining the preprocessed channel matrix of the network device from the at least one first terminal device to the first subcarrier with the channel matrix of the network device from the zero or at least one second terminal device to the first subcarrier to obtain a combined channel matrix of the plurality of terminal devices on the first subcarrier.
4. The method of claim 3, wherein the pre-processing comprises at least one of:
the method comprises the following steps of phase rotation processing, matrix transposition processing or matrix conjugate transposition processing, merging processing, Singular Value Decomposition (SVD) processing and geometric mean value decomposition (GMD) processing of at least two rows or columns of a channel matrix.
5. The method of claim 1, wherein the determining a downlink MU-MIMO orientation matrix on the first subcarrier for the plurality of terminal devices according to the joint channel matrix on the first subcarrier for the plurality of terminal devices comprises:
performing first processing on the joint channel matrix of the plurality of terminal devices on the first subcarrier, and determining a result of the first processing as a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier, wherein the first processing includes at least one of the following processing: matrix inversion processing, SVD processing and GMD processing.
6. The method of claim 5, wherein the determining the downlink MU-MIMO orientation matrix on the first subcarrier for the plurality of terminal devices according to the joint channel matrix on the first subcarrier for the plurality of terminal devices, further comprises:
performing second processing on a result of the first processing, and determining a result of the second processing as a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier, wherein the second processing is different from the first processing, and the second processing comprises at least one of the following processing: uplink and downlink calibration processing, SVD processing, GMD processing, phase rotation processing, matrix transposition processing and conjugate transposition processing.
7. The method of claim 1, wherein the determining the downlink MU-MIMO orientation matrix on the first subcarrier for the plurality of terminal devices according to the channel matrix on the first subcarrier from each of the plurality of terminal devices to the network device comprises:
if the difference between the channel matrix of the third terminal device to the network device on the first subcarrier and the historical channel matrix of the third terminal device to the network device on the first subcarrier exceeds a threshold value, dividing the plurality of terminal devices into at least one group according to the channel matrix of each terminal device to the network device on the first subcarrier, wherein each group comprises at least two terminal devices;
and determining a downlink MU-MIMO directional matrix corresponding to each group on the first subcarrier according to a channel matrix from the terminal equipment of each group to the network equipment in the at least one group on the first subcarrier.
8. The method according to any one of claims 1 to 7, further comprising:
determining downlink MU-MIMO directional matrixes of the plurality of terminal devices on at least one second subcarrier according to the data packet sent by each terminal device of the plurality of terminal devices;
and performing interpolation processing on the downlink MU-MIMO directional matrixes of the plurality of terminal devices on the first subcarrier and the at least one second subcarrier to obtain the downlink MU-MIMO directional matrixes of the plurality of terminal devices on at least one third subcarrier.
9. An apparatus for multi-user multiple-input multiple-output (MU-MIMO) transmission, comprising:
a first determining unit, configured to determine, according to a data packet sent by each terminal device in a plurality of terminal devices, a channel matrix on a first subcarrier from each terminal device to a network device;
a second determining unit, configured to determine, according to the channel matrix on the first subcarrier, determined by the first determining unit, from each of the plurality of terminal devices to the network device, a downlink MU-MIMO orientation matrix on the first subcarrier for the plurality of terminal devices;
the second determining unit is specifically configured to:
determining a joint channel matrix of the plurality of terminal devices on the first subcarrier according to a channel matrix of each terminal device in the plurality of terminal devices to the network device on the first subcarrier;
and determining a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier according to the joint channel matrix of the plurality of terminal devices on the first subcarrier.
10. The apparatus according to claim 9, wherein the second determining unit is specifically configured to:
performing uplink and downlink calibration processing on a channel matrix on the first subcarrier from each terminal device to the network device in the plurality of terminal devices to obtain a channel matrix on the first subcarrier from the network device to each terminal device;
and determining a joint channel matrix of the plurality of terminal devices on the first subcarrier according to the channel matrix of each terminal device from the network device to the plurality of terminal devices on the first subcarrier.
11. The apparatus according to claim 9, wherein the second determining unit is specifically configured to:
preprocessing a channel matrix of at least one first terminal device to the network device on the first subcarrier in the plurality of terminal devices to obtain a preprocessed channel matrix of the at least one first terminal device to the network device on the first subcarrier, wherein the plurality of terminal devices include the at least one first terminal device and zero or at least one second terminal device;
and combining the preprocessed channel matrix of the network device from the at least one first terminal device to the first subcarrier with the channel matrix of the network device from the zero or at least one second terminal device to the first subcarrier to obtain a combined channel matrix of the plurality of terminal devices on the first subcarrier.
12. The apparatus of claim 11, wherein the pre-processing comprises at least one of:
the method comprises the following steps of phase rotation processing, matrix transposition processing or matrix conjugate transposition processing, merging processing, Singular Value Decomposition (SVD) processing and geometric mean value decomposition (GMD) processing of at least two rows or columns of a channel matrix.
13. The apparatus according to claim 9, wherein the second determining unit is specifically configured to:
performing first processing on the joint channel matrix of the plurality of terminal devices on the first subcarrier, and determining a result of the first processing as a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier, wherein the first processing includes at least one of the following processing: matrix inversion processing, SVD processing and GMD processing.
14. The apparatus according to claim 13, wherein the second determining unit is specifically configured to:
performing second processing on a result of the first processing, and determining a result of the second processing as a downlink MU-MIMO directional matrix of the plurality of terminal devices on the first subcarrier, wherein the second processing is different from the first processing, and the second processing comprises at least one of the following processing: uplink and downlink calibration processing, SVD processing, GMD processing, phase rotation processing, matrix transposition processing and conjugate transposition processing.
15. The apparatus according to claim 9, wherein the second determining unit is specifically configured to:
if the difference between the channel matrix of the third terminal device to the network device on the first subcarrier and the historical channel matrix of the third terminal device to the network device on the first subcarrier exceeds a threshold value, dividing the plurality of terminal devices into at least one group according to the channel matrix of each terminal device to the network device on the first subcarrier, wherein each group comprises at least two terminal devices;
and determining a downlink MU-MIMO directional matrix corresponding to each group on the first subcarrier according to a channel matrix from the terminal equipment of each group to the network equipment in the at least one group on the first subcarrier.
16. The apparatus according to any of claims 9 to 15, wherein the second determining unit is further configured to:
determining downlink MU-MIMO directional matrixes of the plurality of terminal devices on at least one second subcarrier according to the data packet sent by each terminal device of the plurality of terminal devices;
and performing interpolation processing on the downlink MU-MIMO directional matrixes of the plurality of terminal devices on the first subcarrier and the at least one second subcarrier to obtain the downlink MU-MIMO directional matrixes of the plurality of terminal devices on at least one third subcarrier.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7876715B1 (en) * | 2008-09-05 | 2011-01-25 | Cisco Technology, Inc. | Beamforming multiple-input multiple-output wireless techniques using spatial decomposition for frequency division duplex systems |
| CN102710390A (en) * | 2012-05-03 | 2012-10-03 | 新邮通信设备有限公司 | Method and device for precoding in multi-user MIMO (multiple input multiple output) system |
| CN102893537A (en) * | 2010-06-16 | 2013-01-23 | 马维尔国际贸易有限公司 | Alternate feedback types for downlink multiple user mimo configurations |
| CN103081420A (en) * | 2010-08-10 | 2013-05-01 | 马维尔国际贸易有限公司 | Sub-band feedback for beamforming on downlink multiple user MIMO configurations |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110013603A1 (en) * | 2009-07-20 | 2011-01-20 | Qinghua Li | Techniques for MIMO beamforming for frequency selective channels in wireless communication systems |
| US8442142B2 (en) * | 2010-02-19 | 2013-05-14 | Broadcom Corporation | Method and system for beamforming signal transmission under a per-antenna power constraint |
| US8446971B2 (en) * | 2010-08-23 | 2013-05-21 | Intel Corporation | Communication station and method for efficiently providing channel feedback for MIMO communications |
| CN104272605B (en) * | 2012-05-09 | 2017-09-29 | 交互数字专利控股公司 | Multi-user's multiple input multiple output communications in WLAN and wireless transmission and receiving unit |
| US9281885B2 (en) * | 2014-04-07 | 2016-03-08 | Imagination Technologies, Llc | Reordering of a beamforming matrix based on encoding |
-
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7876715B1 (en) * | 2008-09-05 | 2011-01-25 | Cisco Technology, Inc. | Beamforming multiple-input multiple-output wireless techniques using spatial decomposition for frequency division duplex systems |
| CN102893537A (en) * | 2010-06-16 | 2013-01-23 | 马维尔国际贸易有限公司 | Alternate feedback types for downlink multiple user mimo configurations |
| CN103081420A (en) * | 2010-08-10 | 2013-05-01 | 马维尔国际贸易有限公司 | Sub-band feedback for beamforming on downlink multiple user MIMO configurations |
| CN102710390A (en) * | 2012-05-03 | 2012-10-03 | 新邮通信设备有限公司 | Method and device for precoding in multi-user MIMO (multiple input multiple output) system |
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