WO2019201251A1

WO2019201251A1 - Transmission and reception method and device for multi-antenna system

Info

Publication number: WO2019201251A1
Application number: PCT/CN2019/082933
Authority: WO
Inventors: 伯琳; 刘云; 夏欣; 陈卫民
Original assignee: 华为技术有限公司
Priority date: 2018-04-19
Filing date: 2019-04-16
Publication date: 2019-10-24
Also published as: CN110391825A; CN110391825B

Abstract

The present application discloses a transmission and reception method and a device for a multi-antenna system. The method comprises: a network apparatus determining a first weight value and a second weight value for precoding, wherein the first weight value and the second weight value are different; and the network apparatus sending data and a reference signal to a terminal apparatus, wherein the first weight value is used for precoding of the data, and the second weight value is used for precoding of the reference signal. The method is adopted to resolve the issue of interference between UE units, and to improve the demodulation performance of a terminal apparatus, thereby increasing system capacity.

Description

Multi-antenna system transmitting and receiving method and device

The present application claims priority to Chinese Patent Application No. 201810355732.0 filed on Apr. 19, 2018, the entire disclosure of which is incorporated herein by reference. In this application.

Technical field

The present application relates to the field of wireless communications technologies, and in particular, to a multi-antenna system transmitting and receiving method and apparatus.

Background technique

With the continuous evolution of communication systems, the number of users that need to be supported in long term evolution (LTE) systems and future 5G systems is increasing, and the demand for system capacity is increasing, especially for the rise of video services. The demand for downstream capacity is particularly significant. However, the spectrum resources of the system are limited. How to increase the system capacity as much as possible under limited spectrum resources has become the focus of attention.

At present, network devices (for example, base stations) in a communication system are equipped with multiple antennas, and downlink transmission can adopt Multi-user beamforming (MU-BF) technology. As shown in FIG. 1, downlink data needs to be transmitted. A plurality of user equipments (UEs) (such as UE1 to UEN in FIG. 1) are used as paired UEs, and the base station simultaneously transmits data to the paired multiple UEs on the same time-frequency resource, so as to achieve no bandwidth increase. In the case of achieving the purpose of increasing the capacity of the cell. However, the MU-BF technology may introduce interference between UEs, resulting in degradation of data demodulation performance of the UE, which affects the capacity gain of the system.

Summary of the invention

The embodiments of the present invention provide a method and a device for transmitting and receiving a multi-antenna system, which are used to solve the problem of interference between UEs existing in the prior art.

In a first aspect, an embodiment of the present application provides a multi-antenna system transmitting method, where the method includes:

The network device determines a first weight and a second weight used by the precoding, wherein the first weight is different from the second weight; the network device sends data and a reference signal to the terminal device, where The data is precoded using the first weight, and the reference signal is precoded using the second weight.

Therefore, the network device pre-encodes the data by using the first weight and pre-codes the reference signal by using the second weight, so that the terminal device receives the signal according to the received reference signal and uses the MRC receiver to receive the signal. The data sent by the network device to the paired terminal device is not interfered by the other paired terminal devices, and the interference between the terminal devices can be completely suppressed, and the problem of interference between UEs existing in the prior art is solved. Improve the demodulation performance of the terminal equipment, thereby increasing system capacity.

In a possible design, the first weight is a multi-user beamforming MU-BF weight corresponding to the terminal device, and the second weight is a single-user beamforming SU- corresponding to the terminal device. And a weight obtained by multiplying the BF weight by the first matrix; the first matrix is configured to make the received power of the data the same as the received power of the reference signal.

In a possible design, the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a SU-BF weight corresponding to the terminal device;

The method further includes: the network device transmitting first information to the terminal device; wherein the first information is used to indicate a first matrix, and the first matrix is used to enable received power of the data The received power of the reference signal is the same.

Therefore, since the received power of the data received by the terminal device and the received power of the reference signal are different, the first matrix needs to be indicated to the terminal device, so that the terminal device needs to be based on the first weight and the second weight. The reference signal estimated channel and the first matrix determine the updated channel to eliminate the influence of the received power of the data and the received power of the reference signal on demodulating the data of the terminal device.

It should be noted that, based on the same concept, in addition to the first matrix, in order to solve the problem of interference between the terminal devices and ensure that the terminal device can correctly demodulate the data, other types of matrices may be designed, which is not limited in this application.

In a possible design, the method further includes: the network device sending second information to the terminal device, wherein the second information is used to indicate that the terminal device adopts a maximum ratio combining MRC receiver solution Tune the data.

Therefore, since the MRC receiver does not actively adjust the channel estimated according to the reference signal, the terminal device cooperates with the MRC receiver to demodulate the data, thereby completely suppressing interference between the terminal devices and improving the demodulation performance of the terminal device, thereby Increase system capacity.

In a second aspect, an embodiment of the present application provides a multi-antenna system receiving method, where the method includes:

The terminal device receives the reference signal and data from the network device, wherein the data is precoded using a first weight, the reference signal is precoded using a second weight, the first weight and the second weight The values are different; the terminal device demodulates the data by using an MRC receiver according to the channel estimated by the reference signal.

Therefore, for any terminal device paired with the terminal device, the reference signal sent by the network device to the terminal device is a reference signal pre-coded using the second weight corresponding to the terminal device, and the network device is paired with the terminal device. The data sent by the device is pre-coded by using the paired terminal device corresponding to the first weight. Therefore, when the channel estimated by the terminal device according to the received reference signal receives the signal by using the MRC receiver, the network device does not receive the signal. The data of the paired terminal device, the terminal device is not interfered by other paired terminal devices, and can completely suppress the interference between the terminal devices, solve the problem of interference between UEs existing in the prior art, and improve the solution of the terminal device. Adjust performance to increase system capacity.

In a possible design, the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a SU-BF weight corresponding to the terminal device and the first matrix phase Multiplying the obtained weight; the first matrix is for making the received power of the data the same as the received power of the reference signal.

Before the terminal device receives the reference signal and the data from the network device, the terminal device receives the first information from the network device, the first information is used to indicate a first matrix, and the first matrix is used to make the data The received power is the same as the received power of the reference signal;

In a possible design, if the first weight is a MU-BF weight corresponding to the terminal device, the second weight is a SU-BF weight corresponding to the terminal device, where When the terminal device demodulates the data by using the MRC receiver according to the channel estimated by the reference signal, the terminal device determines the updated channel according to the channel estimated by the reference signal and the first matrix; The updated channel uses an MRC receiver to demodulate the data.

Therefore, the terminal device can eliminate the influence of demodulating data by the terminal device due to the difference in the received power of the data and the received power of the reference signal.

In a possible design, before the terminal device receives the reference signal and the data from the network device, the terminal device receives the second information from the network device, where the second information is used to indicate that the terminal device adopts the The MRC receiver demodulates the data.

In addition, the network device can also notify the terminal device to demodulate the data by using the MRC receiver in an implicit manner. For example, the terminal device can determine whether there is a terminal device paired with itself, and when the terminal device determines that there is a terminal device paired with itself, the terminal device uses the MRC receiver to demodulate the data.

In a third aspect, an embodiment of the present application provides a multi-antenna system transmitting apparatus, where the apparatus includes:

a processing unit, configured to determine a first weight and a second weight used by the precoding, where the first weight is different from the second weight;

And a sending unit, configured to send data and a reference signal to the terminal device, where the data is precoded using the first weight, and the reference signal is precoded using the second weight.

The sending unit is further configured to: send, to the terminal device, first information, where the first information is used to indicate a first matrix, and the first matrix is configured to use the received power of the data and the The received power of the reference signal is the same.

In a possible design, the sending unit is further configured to: send second information to the terminal device, where the second information is used to indicate that the terminal device uses a maximum ratio combining MRC receiver to demodulate The data.

In a fourth aspect, an embodiment of the present application provides a multi-antenna system receiving apparatus, where the apparatus includes:

a receiving unit, configured to receive a reference signal and data from a network device, wherein the data is precoded using a first weight, the reference signal is precoded using a second weight, the first weight and the The second weight is different;

And a processing unit, configured to demodulate the data by using an MRC receiver according to the channel estimated by the reference signal.

The receiving unit is further configured to:

Receiving first information from the network device before receiving the reference signal and data from the network device, the first information being used to indicate a first matrix, the first matrix being configured to enable received power of the data The received power of the reference signal is the same;

In a possible design, if the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a SU-BF weight corresponding to the terminal device, the processing Unit, specifically for:

Determining an updated channel according to the channel estimated by the reference signal and the first matrix;

The data is demodulated using an MRC receiver based on the updated channel.

In a possible design, the receiving unit is further configured to:

The second information is received from the network device prior to receiving the reference signal and data from the network device, the second information being used to instruct the device to demodulate the data using the MRC receiver.

In a fifth aspect, an embodiment of the present application provides a multi-antenna system transmitting apparatus, where the apparatus includes a processor and a storage medium, where the storage medium stores an instruction, when the instruction is executed by the processor, causing the processing A method of performing any of the possible aspects of the first aspect or the first aspect.

In a sixth aspect, an embodiment of the present application provides a multi-antenna system receiving apparatus, where the apparatus includes a processor and a storage medium, where the storage medium stores an instruction, when the instruction is executed by the processor, causing the processing The method of performing any of the possible aspects of the second aspect or the second aspect.

In a seventh aspect, the embodiment of the present application provides a network device, where the network device includes a transceiver, a processor, and a memory, where the memory is used to store a computer program, and the processor invokes a computer program stored in the memory to pass The transceiver performs the method of any of the first aspect or the first aspect.

In an eighth aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a transceiver, a processor, and a memory, where the memory is used to store a computer program, and the processor invokes a computer program stored in the memory to pass The transceiver performs the method of any of the possible aspects of the second aspect or the second aspect.

In a ninth aspect, the embodiment of the present application further provides a computer readable storage medium storing a computer program, when the computer program is run on a computer, causing the computer to perform the method described in the above aspects.

In a tenth aspect, the embodiment of the present application further provides a computer program product comprising a program, when executed on a computer, causing the computer to perform the method described in the above aspects.

In an eleventh aspect, the embodiment of the present application further provides a network system, where the network system includes the network device described in the foregoing seventh aspect, and the terminal device in the foregoing eighth aspect.

DRAWINGS

1 is a schematic diagram of a network device transmitting data to multiple terminal devices based on the MU-BF technology in the embodiment of the present application;

2 is a flowchart of sending, by the network device, data to multiple terminal devices based on the MU-BF technology in the embodiment of the present application;

FIG. 3 is a schematic diagram of a coding process of LTE according to an embodiment of the present application;

4 is a flowchart of an overview of a method for transmitting and receiving a multi-antenna system according to an embodiment of the present application;

FIG. 5 is a flowchart of sending data to multiple terminal devices based on the MU-BF technology in the embodiment of the present application;

6 is a schematic structural diagram of a multi-antenna system transmitting apparatus according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a multi-antenna system receiving apparatus according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a network device according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

detailed description

Embodiments of the present application will be described below with reference to the accompanying drawings.

The embodiment of the present application is applied to a time division duplex (TDD) wireless cellular communication system in which both a network device and a terminal device have multiple antennas.

The network element involved in the embodiment of the present application includes a network device and a terminal device.

The network device is a specific implementation form of an access network (AN), and may also be referred to as an access node. If it is a form of wireless access, it is called a radio access network (RAN). Provide wireless access services for terminal devices. The access node may be a base station in a global system for mobile communication (GSM) system or a code division multiple access (CDMA) system, or may be a wideband code division multiple A base station (NodeB) in an access, WCDMA system may also be an evolved base station (evolutional node B, eNB or eNodeB) in an LTE system, or a base station device, a small base station device, a wireless access node (WiFi) in a 5G network. The present invention is not limited to the above, and is not limited to the present invention.

The terminal device may be a wireless terminal or a wired terminal. The wireless terminal may be a device that provides voice and/or data connectivity to the user, a handheld device with wireless connectivity, or other processing device that is connected to the wireless modem. The wireless terminal can communicate with at least one core network via a radio access network (RAN), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, such as They can be portable, pocket, handheld, computer built-in or in-vehicle mobile devices that exchange language and/or data with the wireless access network. For example, personal communication service (PCS) telephone, cordless telephone, session initiation protocol (SIP) telephone, wireless local loop (WLL) station, personal digital assistant (personal digital assistant, PDA) and other equipment. A wireless terminal may also be called a system, a subscriber unit (SU), a subscriber station (SS), a mobile station (MB), a mobile station, a remote station (RS), Access point (AP), remote terminal (RT), access terminal (AT), user terminal (UT), user agent (UA), or user equipment (user equipment, UE).

Referring to FIG. 2, a flow chart of a network device transmitting data to multiple terminal devices based on the MU-BF technology in the prior art is shown.

Step 201: The network device determines N terminal devices.

N is a positive integer, and the foregoing N terminal devices are paired terminal devices. Specifically, the network device determines, according to channel estimation results obtained by sounding reference signals (SRS) sent by each terminal device within the scope of the jurisdiction. A paired terminal device in each terminal device. For the paired terminal devices, the network device can separately send corresponding data and reference signals to the terminal devices on the same time-frequency resource.

For example, in a certain predetermined period of time, 10 UEs respectively send SRSs to the base station, and the base station performs channel estimation according to the received 10 SRSs respectively, and based on the channel estimation results corresponding to the 10 SRSs respectively, the channels satisfying the preset conditions are obtained. The UE corresponding to the estimation result is used as a paired UE. For example, a UE whose channel correlation is lower than a preset threshold is used as a paired UE.

Step 202: The network device calculates a single-use beamforming (SU-BF) weight corresponding to each of the N terminal devices.

The dimension of the SU-BF weight is the number of transmitting antennas of the network device multiplied by the number of data streams of the terminal device. Algorithms for calculating SU-BF weights include, but are not limited to, eigen-beamforming (EBF), maximum ratio transmission (MRT), and the like. The network device may calculate the corresponding SU-BF weight of each terminal device by using any one of the foregoing algorithms.

Step 203: The network device performs joint orthogonalization processing on the SU-BF weights corresponding to the N terminal devices to obtain a multi-user beamforming (MU-BF) weight corresponding to each terminal device.

The orthogonalization algorithm for calculating the MU-BF weight includes, but is not limited to, Zero Forcing (ZF), Signal to Leakage and Noise Ratio (SLNR), and block diagonalization. (Block diagonalization, BD) and the like. The network device may calculate the MU-BF weight corresponding to each terminal device by using any of the above orthogonalization algorithms.

Step 204: The network device separately sends corresponding data and reference signals to the N terminal devices on the same time-frequency resource.

Taking the kth terminal device as an example, the data sent to the kth terminal device is data obtained by precoding the data to be transmitted to the kth terminal device by using the MU-BF weight corresponding to the kth terminal device. The reference signal transmitted to the kth terminal device is a reference signal obtained by precoding the reference signal to be transmitted to the kth terminal device using the MU-BF weight corresponding to the kth terminal device. The kth terminal device is any one of the N terminal devices, and k is a positive integer.

Specifically, taking the LTE encoding process shown in FIG. 3 as an example, for the data and the reference signal sent by the network device to the kth terminal device, the bit stream is first encoded by the scrambling code, and the bit stream is mapped to the symbol by the modulation mapping. Streaming, then mapping the symbol stream to a data stream by layer mapping, and then performing the precoding operation shown in the virtual box of FIG. 3, that is, multiplying the data stream by the MU-BF weight corresponding to the kth terminal device, and finally, passing the resource The unit mapping and OFDM symbol generation process generates a precoded data stream as an OFDM symbol and transmits it through an antenna port. It should be understood that the present application is only described by taking the LTE encoding process as an example, and may also be a coding process of a future communication system, which is not limited in this application.

As can be seen from the above, the network device needs to perform an operation requiring encoding on the data and the reference signal before transmitting the data and the reference signal to the terminal device.

The reference signal involved in the embodiment of the present application is a demodulation reference signal (DMRS).

It should be understood that, in FIG. 2, one terminal device of a plurality of terminal devices is taken as an example. The other terminal devices of the plurality of terminal devices can communicate with the network device by referring to a process in which the terminal device communicates with the network device.

Step 205: The terminal device selects a receiver to demodulate data received from the network device according to its configuration.

Specifically, each terminal device can select a receiver according to its own configuration. For example, a maximum ratio combining (MRC) receiver, an interference rejection combining (IRC) receiver, and a maximum likelihood detector can be selected. (Maximum Likelihood Detector, MLD) receiver, Serial Interference Cancellation (SIC) receiver, etc., and the specific type of receiver selected by each terminal device depends on the specific algorithm implementation of the terminal device.

However, as shown in FIG. 2, the existing algorithm performs joint orthogonalization processing on the SU-BF weights corresponding to the N terminal devices to obtain the MU-BF weight, and the number of data streams of the terminal device is smaller than the number of receiving antennas of the terminal device. When the dimension of the channel space after the joint orthogonalization process is smaller than the channel dimension, there is a channel space that is not orthogonalized, and the space that is not orthogonalized is introduced to other terminals when the terminal device receives a signal from the network device. The interference of the device causes loss of data demodulation performance of the terminal device and affects capacity gain. In particular, when the number of paired terminal devices is large, the interference problem between the terminal devices is more significant.

Referring to FIG. 4, an embodiment of the present application provides a method for transmitting and receiving multiple antenna systems, which is used to solve the interference problem between UEs in the foregoing solution. The method includes:

The network device can first determine the paired terminal device. For details, refer to step 201. The following content is described by taking a network device to communicate with any one of the paired terminal devices.

Step 400: The network device determines a first weight and a second weight used by the precoding, where the first weight is different from the second weight.

In a first possible implementation manner, the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a weight obtained by multiplying the SU-BF weight corresponding to the terminal device by the first matrix. The first matrix makes the received power of the data the same as the received power of the reference signal.

The SU-BF weight corresponding to the terminal device may be determined by an algorithm such as EBF or MRT.

The MU-BF weight corresponding to the terminal device is obtained by performing joint orthogonalization processing according to the SU-BF weights corresponding to the paired terminal devices, and specifically, an algorithm such as ZF, SLNR, or BD may be used.

It should be understood that the above various algorithms are merely examples and are not to be construed as limiting the embodiments of the present application.

The received power of the data refers to the power of the signal after the interference and noise are removed from the data received by the terminal device. The received power of the reference signal refers to the power of the signal after the interference and noise are removed from the reference signal received by the terminal device. The received power of the data is the same as the received power of the reference signal. When the terminal device uses the receiver for demodulation, the received power of the data is consistent with the received power of the reference signal, so that the data can be correctly demodulated. The first matrix may also be referred to as a power compensation matrix.

It should be understood that the received power referred to in the embodiments of the present application refers to the power of the signal after the interference and noise are removed from the signal received by the receiver, or the interference and noise are removed from the data stream received by the receiver. The power of the data stream.

In a possible design, if the MU-BF weight corresponding to the terminal device is jointly orthogonalized according to the SU-BF weight corresponding to the paired terminal devices by using the ZF algorithm, the first matrix is a pair. The angle matrix, the dimension of the first matrix is the number of data streams of the terminal device multiplied by the number of data streams of the terminal device. Each diagonal element corresponds to a power compensation factor of a data stream, and the power compensation factor of each data stream is a received power of the data stream on the terminal device side when the data stream is precoded by using the MU-BF weight value and adopts the SU - The ratio of the BF weight to the received power of the data stream on the terminal device side when the data stream is precoded. The network device can determine the power compensation factor of each data stream according to an existing algorithm, which is not limited in this application. Therefore, when a data stream is precoded by using a weight value obtained by multiplying a corresponding SU-BF weight value by a power compensation factor of the data stream, the received power of the data stream on the terminal device side, and the pair When the data stream is precoded with the corresponding MU-BF weight, the received power of the data stream on the terminal device side is equal.

It can be known that the data to be sent to the terminal device is precoded by using the MU-BF weight, and the reference signal that needs to be sent to the terminal device is precoded by using the weight obtained by multiplying the SU-BF weight by the first matrix. The received power of the data can be made the same as the received power of the reference signal.

In addition, if the MU-BF weight corresponding to the terminal device is obtained by joint orthogonalization processing according to the SU-BF weight corresponding to the paired terminal device by using an algorithm other than the ZF algorithm, the first matrix is not a diagonal Arrays, based on the same principle, the corresponding first matrix can also be obtained according to the corresponding algorithm, which is not described herein again.

In a second possible implementation manner, the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a SU-BF weight corresponding to the terminal device. At this time, the network device further needs to send the first information to the terminal device, where the first information is used to indicate the first matrix, and the first matrix is used to make the received power of the data the same as the received power of the reference signal.

The first matrix referred to in the second possible implementation is the same as the first matrix referred to in the first possible implementation, and the repeated description is not repeated.

The first possible implementation differs from the second possible implementation in that when the network device transmits the data and the reference signal by using the first weight and the second weight of the first possible implementation manner, The received power of the data received by the terminal device is the same as the received power of the reference signal, and the terminal device can directly demodulate the data by using the MRC receiver according to the channel estimated by the reference signal. When the network device sends the data and the reference signal by using the first weight and the second weight of the second possible implementation manner, the received power of the data received by the terminal device and the received power of the reference signal are different, and the terminal device needs Determining the updated channel according to the channel estimated by the reference signal and the first matrix, so as to eliminate the influence of the received power of the data and the received power of the reference signal on demodulating the data of the terminal device, and then, the terminal device according to the updated The channel uses an MRC receiver to demodulate data.

Step 410: The network device sends data and a reference signal to the terminal device, where the data is data pre-coded using the first weight, and the reference signal is a reference signal pre-coded using the second weight.

It should be understood that the network device transmits corresponding data and reference signals to the paired terminal devices on the same time-frequency resource. Therefore, the network device needs to perform the above steps 400 and 410 for each of the paired terminal devices.

Moreover, in one possible design, the network device sends the second information to the terminal device, wherein the second information is used to instruct the terminal device to demodulate the data using the MRC receiver.

For example, the network device may send Downlink Control Information (DCI) to the terminal device, where the DCI includes the second information, and the second information occupies 1 bit. For example, the MuBf mode (MuBfMode)=0 indicates that the terminal device selects the receiver according to its own configuration, that is, the network device does not use the transmission method provided by the embodiment of the present application to send data and reference signals to the terminal device, and MuBfMode=1 indicates that the terminal device adopts the MRC to receive. The device demodulates the data, that is, the network device sends the data and the reference signal to the terminal device by using the transmitting method provided by the embodiment of the present application.

In addition to instructing the terminal device to demodulate data using the MRC receiver through the second information, the network device can also notify the terminal device to demodulate the data by using the MRC receiver in an implicit manner. For example, the terminal device can determine whether there is a terminal device paired with itself, and when the terminal device determines that there is a terminal device paired with itself, the terminal device uses the MRC receiver to demodulate the data.

It should be understood that, in addition to the MRC receiver, the terminal device can also adopt a receiver with similar functions. The embodiment of the present application does not limit the terminal device to only adopt the MRC receiver.

Step 420: The terminal device receives the reference signal and the data from the network device, and the terminal device demodulates the data by using the MRC receiver according to the channel estimated by the reference signal.

It should be understood that, for any terminal device paired with the terminal device, the MU-BF weight corresponding to the terminal device is orthogonal to the SU-BF weight corresponding to the paired terminal device, and the SU_BF right corresponding to the terminal device The value is orthogonal to the MU-BF weight corresponding to the paired terminal device. The reference signal sent by the network device to the terminal device is a reference signal pre-coded using a weight value obtained by multiplying the SU_BF weight value or the SU-BF weight value by the first matrix, and the network device sends the data to the paired terminal device. The pre-coded data is obtained by using the MU-BF weight corresponding to the paired terminal device. Therefore, when the channel estimated by the terminal device according to the received reference signal is received by the MRC receiver, the network device cannot receive the pairing. The data of the terminal device is not interfered by other paired terminal devices, and the interference between the terminal devices can be completely suppressed, and the demodulation performance of the terminal device is improved, thereby improving the system capacity.

The embodiment shown in FIG. 4 will be specifically described below with reference to specific examples.

The base station determines that UE1 and UE2 are paired two UEs, UE1 and UE2 both have four receiving antennas, and the base station (with four transmitting antennas) transmits two data streams to each UE. As shown in FIG. 5, the singular value decomposition (SVD) decomposition of the channel matrix of 4x4 (the number of transmitting antennas of the base station multiplied by the number of receiving antennas of UE1) of UE1 is shown.

Among them, SVD decomposition, that is, singular value decomposition, is to decompose an m × n matrix H into H = U Σ VH. Where U is an m×m-order 酉 matrix; Σ is an m×n-order non-negative real diagonal matrix; VH, which is the conjugate transpose of V, is an n×n-order 酉 matrix. Such decomposition is called singular value decomposition of M. The element λi on the diagonal is the singular value of M, and the singular value is arranged from large to small, and λ0 is the largest. Each column vector in V is a right singular vector of H, and each column vector in U is a left singular vector of H.

Specifically, as shown in FIG. 5, H is a 4×4 channel matrix of UE1, U is a 4×4 order 酉 matrix; Σ is a 4×4 order non-negative real diagonal matrix; and V is a 4×4 order 酉 matrix, V0, v1, v2, and v3 are the four right singular vectors of H, respectively corresponding to singular values λ0, λ1, λ2, λ3; similarly, u0, u1, u2, and u3 are four left singular vectors of H, corresponding to Singular values λ0, λ1, λ2, λ3. The SU-BF weight of UE1 is a matrix [v0, v1], where v0 and v1 respectively represent the right singular value corresponding to the largest singular value and the second largest singular value; the MU-BF weight calculation only performs v0 and v1. ZF is jointly orthogonalized, and v2 and v3 are not subjected to ZF joint orthogonalization, so that the signal of UE2 will enter the received signal of UE1 from the channel space of v2 and v3, causing interference to UE1, but if only in the direction of zero forcing The corresponding [u0, u1] spatial reception, that is, UE1 adopts the conjugate transposition of [u0, u1] multiplied by the received signal of UE1 for receiving equalization, so that the equalized signal can be achieved without UE2 interference. When the DMRS received by the UE1 is the DMRS pre-coded by using the second weight, the channel estimated by the UE1 according to the DMRS is [u0, u1], and the UE1 uses the estimated channel at this time to perform receiver equalization to achieve no UE2. Interference.

Based on the above embodiment, the embodiment of the present application provides a multi-antenna system transmitting apparatus. Referring to FIG. 6, the apparatus 600 includes:

The processing unit 601 is configured to determine a first weight and a second weight used by the precoding, where the first weight is different from the second weight;

The sending unit 602 is configured to send data and a reference signal to the terminal device, where the data is data pre-coded using the first weight, and the reference signal is pre-coded using the second weight After the reference signal.

The sending unit 602 is further configured to: send the first information to the terminal device;

The first information is used to indicate a first matrix, and the first matrix is configured to make a received power of the data the same as a received power of the reference signal.

In a possible design, the sending unit 602 is further configured to: send, to the terminal device, second information, where the second information is used to indicate that the terminal device adopts a maximum ratio combining MRC receiver solution. Tune the data.

Based on the above embodiment, the embodiment of the present application provides a multi-antenna system receiving apparatus. Referring to FIG. 7, the apparatus 700 includes:

The receiving unit 701 is configured to receive, by the network device, the reference signal and the data, where the data is pre-coded data using a first weight, and the reference signal is a reference signal pre-coded using the second weight The first weight is different from the second weight;

The processing unit 702 is configured to demodulate the data by using an MRC receiver according to the channel estimated by the reference signal.

In a possible design, the receiving unit 701 is further configured to:

The processing unit 702 is specifically configured to:

The data is demodulated using an MRC receiver based on the updated channel.

In a possible design, the receiving unit 701 is further configured to: before receiving the reference signal and the data from the network device, receive the second information from the network device, where the second information is used to indicate the device The data is demodulated using the MRC receiver.

It should be understood that the division of each unit above is only a division of logical functions, and the actual implementation may be integrated into one physical entity in whole or in part, or may be physically separated. Moreover, these units may all be implemented in the form of software by means of processing component calls; or may be implemented entirely in hardware; some units may be implemented in software in the form of processing component calls, and some units may be implemented in hardware. In the implementation process, each step of the above method or each of the above units may be completed by an integrated logic circuit of hardware in the processor element or an instruction in a form of software.

For example, the above units may be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (digital) Signal processor, DSP), or one or more Field Programmable Gate Arrays (FPGAs). As another example, when one of the above units is implemented in the form of a processing component scheduler, the processing element can be a general purpose processor, such as a central processing unit (CPU) or other processor that can invoke the program. As another example, these units can be integrated and implemented in the form of a system-on-a-chip (SOC).

Based on the above embodiment, the embodiment of the present application further provides a network device. Referring to FIG. 8 , the network device 800 includes: a transceiver 801, a processor 802, and a memory 803. The memory 803 is used to store a computer program; the processor 802 calls a computer program stored in the memory 803, and the method shown in FIG. 3 is executed by the transceiver 801.

It can be understood that the foregoing apparatus in the embodiment shown in FIG. 6 can be implemented by the network device 800 shown in FIG. Specifically, the sending unit 602 can be implemented by the transceiver 801, and the processing unit 601 can be implemented by the processor 802. The structure of the network device 800 does not constitute a limitation on the embodiments of the present application.

Based on the above embodiment, the embodiment of the present application further provides a terminal device. Referring to FIG. 9 , the terminal device 900 includes: a transceiver 901, a processor 902, and a memory 903. The memory 903 is used to store a computer program; the processor 902 calls a computer program stored in the memory 903, and the method shown in FIG. 3 is executed by the transceiver 901.

It can be understood that the apparatus in the above embodiment shown in FIG. 7 can be implemented by the terminal device 900 shown in FIG. Specifically, the processing unit 702 can be implemented by the processor 902, and the receiving unit 701 can be implemented by the transceiver 901. The structure of the terminal device 900 does not constitute a limitation on the embodiments of the present application.

In Figures 8 and 9, the processor can be a CPU, a network processor (NP), a hardware chip, or any combination thereof. The memory may include a volatile memory such as a random access memory (RAM); the memory may also include a non-volatile memory such as a read-only memory. , ROM), flash memory, hard disk drive (HDD) or solid-state drive (SSD); the memory may also include a combination of the above types of memory.

In summary, the network device according to the embodiment of the present application determines the first weight and the second weight used by the precoding, where the first weight is different from the second weight. The network device transmits data and a reference signal to the terminal device, wherein the data is data pre-coded using the first weight, and the reference signal is a reference signal pre-coded using the second weight. For any terminal device paired with the terminal device, the reference signal sent by the network device to the terminal device is a reference signal pre-coded using the second weight corresponding to the terminal device, and the network device sends the reference signal to the paired terminal device. The data is pre-coded by using the paired terminal device corresponding to the first weight. Therefore, when the channel estimated by the terminal device according to the received reference signal receives the signal by using the MRC receiver, the network device does not receive the pairing. The data of the terminal device, the terminal device is not interfered by other paired terminal devices, and can completely suppress the interference between the terminal devices, solve the problem of interference between UEs existing in the prior art, and improve the demodulation performance of the terminal device. , thereby increasing system capacity.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Therefore, the embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Moreover, embodiments of the present application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the embodiments of the present invention.

Claims

A multi-antenna system transmitting method, characterized in that the method comprises:

The network device determines a first weight and a second weight used by the precoding, wherein the first weight is different from the second weight;

The network device transmits data and a reference signal to the terminal device, wherein the data is precoded using the first weight, and the reference signal is precoded using the second weight.
The method according to claim 1, wherein the first weight is a multi-user beamforming MU-BF weight corresponding to the terminal device, and the second weight is a single corresponding to the terminal device. And a weight obtained by multiplying a user beamforming SU-BF weight by a first matrix; the first matrix is configured to make a received power of the data the same as a received power of the reference signal.
The method according to claim 1, wherein the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a SU-BF weight corresponding to the terminal device. ;

The method further includes:

Transmitting, by the network device, first information to the terminal device;

The first information is used to indicate a first matrix, and the first matrix is configured to make a received power of the data the same as a received power of the reference signal.
The method of any of claims 1-3, wherein the method further comprises:

The network device sends second information to the terminal device, where the second information is used to instruct the terminal device to demodulate the data by using a maximum ratio combining MRC receiver.
A multi-antenna system receiving method, the method comprising:

The terminal device receives the reference signal and data from the network device, wherein the data is precoded using a first weight, the reference signal is precoded using a second weight, the first weight and the second weight Different values;

The terminal device demodulates the data by using an MRC receiver according to the channel estimated by the reference signal.
The method according to claim 5, wherein the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a SU-BF weight corresponding to the terminal device. a weight obtained by multiplying the first matrix; the first matrix is for making the received power of the data the same as the received power of the reference signal.
The method according to claim 5, wherein the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a SU-BF weight corresponding to the terminal device. ;

Before the terminal device receives the reference signal and the data from the network device, the method further includes:

The terminal device receives first information from the network device, where the first information is used to indicate a first matrix, and the first matrix is configured to make a received power of the data the same as a received power of the reference signal.
The method according to claim 7, wherein the terminal device demodulates the data by using an MRC receiver according to the channel estimated by the reference signal, including:

Determining, by the terminal device, the updated channel according to the channel estimated by the reference signal and the first matrix;

The terminal device demodulates the data by using an MRC receiver according to the updated channel.
The method according to any one of claims 5-8, further comprising: before the terminal device receives the reference signal and the data from the network device, the method further comprising:

The terminal device receives second information from the network device, where the second information is used to instruct the terminal device to demodulate the data by using the MRC receiver.
A multi-antenna system transmitting device, characterized in that the device comprises:

a processing unit, configured to determine a first weight and a second weight used by the precoding, where the first weight is different from the second weight;

And a sending unit, configured to send data and a reference signal to the terminal device, where the data is precoded using the first weight, and the reference signal is precoded using the second weight.
The apparatus according to claim 10, wherein the first weight is a multi-user beamforming MU-BF weight corresponding to the terminal device, and the second weight is a single corresponding to the terminal device And a weight obtained by multiplying a user beamforming SU-BF weight by a first matrix; the first matrix is configured to make a received power of the data the same as a received power of the reference signal.
The apparatus according to claim 10, wherein the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a SU-BF weight corresponding to the terminal device. ;

The sending unit is further configured to: send the first information to the terminal device;

The first information is used to indicate a first matrix, and the first matrix is configured to make a received power of the data the same as a received power of the reference signal.
The device according to any one of claims 10 to 12, wherein the sending unit is further configured to:

And transmitting second information to the terminal device, where the second information is used to instruct the terminal device to demodulate the data by using a maximum ratio combining MRC receiver.
A multi-antenna system receiving device, characterized in that the device comprises:

a receiving unit, configured to receive a reference signal and data from a network device, wherein the data is precoded using a first weight, the reference signal is precoded using a second weight, the first weight and the The second weight is different;

And a processing unit, configured to demodulate the data by using an MRC receiver according to the channel estimated by the reference signal.
The device according to claim 14, wherein the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a SU-BF weight corresponding to the terminal device. a weight obtained by multiplying the first matrix; the first matrix is for making the received power of the data the same as the received power of the reference signal.
The device according to claim 14, wherein the first weight is a MU-BF weight corresponding to the terminal device, and the second weight is a SU-BF weight corresponding to the terminal device. ;

The receiving unit is further configured to:

Receiving first information from the network device before receiving the reference signal and data from the network device, the first information being used to indicate a first matrix, the first matrix being configured to enable received power of the data The received power of the reference signal is the same.
The device according to claim 16, wherein the processing unit is specifically configured to:

Determining an updated channel according to the channel estimated by the reference signal and the first matrix;

The data is demodulated using an MRC receiver based on the updated channel.
The device according to any one of claims 14-17, wherein the receiving unit is further configured to:

The second information is received from the network device prior to receiving the reference signal and data from the network device, the second information being used to instruct the device to demodulate the data using the MRC receiver.
A computer storage medium characterized by storing computer executable instructions that, when executed on a communication device, cause the communication device to perform as claimed in any one of claims 1 to 9. Methods.
A multi-antenna system transmitting apparatus, characterized in that the apparatus comprises a processor and a storage medium, the storage medium storing instructions, when the instructions are executed by the processor, causing the processor to execute according to the claims 1 to the method of any of claims 4.
A multi-antenna system receiving apparatus, characterized in that the apparatus comprises a processor and a storage medium, the storage medium storing instructions, when the instructions are executed by the processor, causing the processor to execute according to the claims 5 to the method of any of claims 9.