CN110391825B

CN110391825B - Method and device for transmitting and receiving multi-antenna system

Info

Publication number: CN110391825B
Application number: CN201810355732.0A
Authority: CN
Inventors: 伯琳; 刘云; 夏欣; 陈卫民
Original assignee: Shanghai Huawei Technologies Co Ltd
Current assignee: Shanghai Huawei Technologies Co Ltd
Priority date: 2018-04-19
Filing date: 2018-04-19
Publication date: 2021-02-09
Anticipated expiration: 2038-04-19
Also published as: WO2019201251A1; CN110391825A

Abstract

The application discloses a method and a device for transmitting and receiving a multi-antenna system, wherein the method comprises the following steps: the network equipment determines a first weight and a second weight used for precoding, wherein the first weight is different from the second weight. The network equipment sends data and reference signals to the terminal equipment, wherein the data are precoded by using the first weight value, and the reference signals are precoded by using the second weight value.

Description

Method and device for transmitting and receiving multi-antenna system

Technical Field

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

Background

With the continuous evolution of communication systems, the number of users to be supported in Long Term Evolution (LTE) systems and future 5G systems is increasing, and the demand for system capacity is increasing, especially the demand for downlink capacity is remarkable due to the rise of services such as video. However, the spectrum resources of the system are limited, and how to increase the system capacity as much as possible under the limited spectrum resources becomes a focus of attention.

At present, network devices (e.g., base stations) in a communication system are equipped with multiple antennas, downlink transmission may employ a Multi-user beamforming (MU-BF) technique, as shown in fig. 1, multiple User Equipments (UEs) (e.g., UE 1-UE N in fig. 1) that need to transmit downlink data are used as paired UEs, and the base stations transmit data to the paired UEs at the same time and frequency resource, so as to achieve the purpose of increasing cell capacity without increasing bandwidth. However, the MU-BF technique may introduce interference between UEs, which may result in degradation of data demodulation performance of the UEs and affect the capacity gain of the system.

Disclosure of Invention

The embodiment of the application provides a method and a device for transmitting and receiving a multi-antenna system, which are used for solving the problem of interference between UE (user equipment) in the prior art.

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

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

Therefore, the network device precodes the data by the first weight and precodes the reference signal by the second weight, so that when the terminal device receives the signal by the MRC receiver according to the channel estimated by the received reference signal, the data sent to the paired terminal device by the network device cannot be received, the terminal device is not interfered by other paired terminal devices, the interference between the terminal devices can be completely suppressed, the problem of interference between UEs in the prior art is solved, the demodulation performance of the terminal device is improved, and the system capacity is improved.

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 weight obtained by multiplying a single-user beamforming SU-BF weight corresponding to the terminal device by a first matrix; the first matrix is used for making the received power of the data the same as that of the reference signal.

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

the method further comprises the following steps: the network equipment sends first information to the terminal equipment; wherein the first information is used for indicating a first matrix, and the first matrix is used for enabling the received power of the data to be the same as the received power of the reference signal.

Therefore, because the received power of the data received by the terminal device is different from the received power of the reference signal by using the first weight and the second weight, the first matrix needs to be indicated to the terminal device, so that the terminal device needs to determine an updated channel according to the channel estimated by the reference signal and the first matrix, and the influence on terminal device demodulation data due to the difference between the received power of the data and the received power of the reference signal is eliminated.

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 terminal devices and ensure that the terminal devices can correctly demodulate data, other types of matrices may be designed, which is not limited in this application.

In one possible design, the method further includes: the network device sends second information to the terminal device,

and the second information is used for indicating the terminal equipment to demodulate the data by adopting a maximum ratio combining MRC receiver.

Therefore, the MRC receiver does not actively adjust the channel estimated according to the reference signal, and the terminal device uses the MRC receiver to demodulate data in a matching manner, so that interference between the terminal devices can be completely suppressed, the demodulation performance of the terminal devices can be improved, and the system capacity can be improved.

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

the method comprises the steps that terminal equipment receives reference signals and data from network equipment, wherein the data are precoded by using a first weight value, the reference signals are precoded by using a second weight value, and the first weight value is different from the second weight value; and the terminal equipment demodulates the data by adopting an MRC receiver according to the channel estimated by the reference signal.

Therefore, for any terminal device paired with the terminal device, since the reference signal sent by the network device to the terminal device is the reference signal precoded by using the second weight corresponding to the terminal device, and the data sent by the network device to the paired terminal device is the data precoded by using the first weight corresponding to the paired terminal device, when the terminal device receives the signal by using the MRC receiver according to the channel estimated by the received reference signal, the data sent by the network device to the paired terminal device cannot be received, and the terminal device is not interfered by other paired terminal devices, so that the interference between the terminal devices can be completely suppressed, the problem of the interference between UEs in the prior art is solved, the demodulation performance of the terminal device is improved, and the system capacity is improved.

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

before a terminal device receives a reference signal and data from a network device, the terminal device receives first information from the network device, wherein the first information is used for indicating a first matrix, and the first matrix is used for enabling the received power of the data to be the same as that of the reference signal;

in a possible design, if the first weight is an MU-BF weight corresponding to the terminal device, and the second weight is an SU-BF weight corresponding to the terminal device, when the terminal device demodulates the data by using an MRC receiver according to a channel estimated by the reference signal, the terminal device determines an updated channel according to the channel estimated by the reference signal and the first matrix; and the terminal equipment demodulates the data by adopting an MRC receiver according to the updated channel.

Therefore, the terminal device can eliminate the influence on the terminal device to demodulate the data due to the fact that the received power of the data is different from the received power of the reference signal.

In one possible design, before a terminal device receives a reference signal and data from a network device, the terminal device receives second information from the network device, the second information being used to instruct the terminal device to demodulate the data with the MRC receiver.

In addition, the network device can also inform the terminal device to adopt the MRC receiver to demodulate data in an implicit mode. For example, the terminal device may 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 demodulates the data using the MRC receiver.

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

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

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

the sending unit is further configured to: sending first information to the terminal equipment; wherein the first information is used for indicating a first matrix, and the first matrix is used for enabling the received power of the data to be the same as the received power of the reference signal.

In one possible design, the sending unit is further configured to: and sending second information to the terminal equipment, wherein the second information is used for indicating the terminal equipment to demodulate the data by adopting a Maximal Ratio Combining (MRC) receiver.

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

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

and the processing unit is used for demodulating the data by adopting an MRC receiver according to the channel estimated by the reference signal.

the receiving unit is further configured to:

before receiving a reference signal and data from a network device, receiving first information from the network device, the first information indicating a first matrix for making a received power of the data the same as a received power of the reference signal;

in a possible design, if the first weight is an MU-BF weight corresponding to the terminal device, and the second weight is an SU-BF weight corresponding to the terminal device, the processing unit is specifically configured to:

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

and demodulating the data by adopting an MRC receiver according to the updated channel.

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

prior to receiving the reference signal and the data from the network device, receiving second information from the network device, the second information for instructing the apparatus to demodulate the data with the MRC receiver.

In a fifth aspect, an embodiment of the present application provides a transmitting apparatus for a multi-antenna system, where the apparatus includes a processor and a storage medium, where the storage medium stores instructions that, when executed by the processor, cause the processor to execute the first aspect or the method of any one of the possible designs of the first aspect.

In a sixth aspect, the present application provides a receiving apparatus of a multi-antenna system, the apparatus includes a processor and a storage medium, where the storage medium stores instructions that, when executed by the processor, cause the processor to execute the method of any one of the possible designs of the second aspect or the second aspect.

In a seventh aspect, an embodiment of the present application provides a network device, where the network device includes a transceiver, a processor, and a memory: the memory is used for storing a computer program; the processor invokes the computer program stored by the memory to perform the method of the first aspect or any one of the possible designs of the first aspect via the transceiver.

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: the memory is used for storing a computer program; the processor invokes the computer program stored in the memory to perform the method of any one of the possible designs of the second aspect or the second aspect via the transceiver.

In a ninth aspect, the present application further provides a computer-readable storage medium, which stores a computer program, and when the computer program runs on a computer, the computer program causes the computer to execute the method in the above aspects.

In a tenth aspect, embodiments of the present application further provide a computer program product including a program, which, when run on a computer, causes the computer to perform the method according to the above aspects.

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

Drawings

Fig. 1 is a schematic diagram illustrating a network device sending data to a plurality of terminal devices based on an MU-BF technique in an embodiment of the present application;

fig. 2 is a flowchart illustrating a network device sending data to a plurality of terminal devices based on an MU-BF technique in an embodiment of the present application;

fig. 3 is a schematic encoding flow diagram of LTE in the embodiment of the present application;

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

fig. 5 is a flowchart of sending data to a plurality of terminal devices based on the MU-BF technique in the embodiment of the present application;

fig. 6 is a schematic structural diagram of a transmitting apparatus of a multi-antenna system in an embodiment of the present application;

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

fig. 8 is a schematic structural diagram of a network device in an embodiment of the present application;

fig. 9 is a schematic structural diagram of a terminal device in the embodiment of the present application.

Detailed Description

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

The embodiment of the application is applied to a Time Division Duplex (TDD) wireless cellular communication system with multiple antennas both in the network device and the terminal device.

The network element related in the embodiment of the application comprises network equipment and terminal equipment.

The network device may also be referred to as AN access node (ap) as a specific implementation form of AN Access Network (AN), and if the network device is in a radio access form, it is referred to as a Radio Access Network (RAN) to provide a radio access service for the terminal device. The access node may specifically be a base station in a global system for mobile communication (GSM) system or a Code Division Multiple Access (CDMA) system, may also be a base station (NodeB) in a Wideband Code Division Multiple Access (WCDMA) system, may also be an evolved node B (eNB) or eNodeB in an LTE system, or may be a base station device, a small base station device, a wireless access node (WiFi AP), a wireless interworking microwave access base station (WiMAX BS) in a 5G network, and the like, which is not limited in this application.

The terminal device may be a wireless terminal or a wired terminal. A wireless terminal may refer to, among other things, a device that provides voice and/or data connectivity to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with at least one core network via a Radio Access Network (RAN), which may exchange language and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. A wireless terminal may also be referred to as a system, a Subscriber Unit (SU), a Subscriber Station (SS), a mobile station (MB), a mobile station (mobile), a Remote Station (RS), an Access Point (AP), a Remote Terminal (RT), an Access Terminal (AT), a User Terminal (UT), a User Agent (UA), or User Equipment (UE).

Fig. 2 is a flowchart illustrating a network device sending data to a plurality of terminal devices based on MU-BF technology in the prior art.

Step 201: the network device determines N terminal devices.

N is a positive integer, where the N terminal devices refer to paired terminal devices, and specifically, the network device determines the paired terminal devices in each terminal device according to channel estimation results respectively obtained from Sounding Reference Signals (SRS) sent by each terminal device within the jurisdiction. For paired terminal devices, the network device may send corresponding data and reference signals to the terminal devices on the same time-frequency resource.

For example, within a certain predetermined period of time, 10 UEs respectively transmit SRS to the base station, the base station performs channel estimation according to the received 10 SRS, and the UE corresponding to the channel estimation result that satisfies the preset condition is used as the paired UE based on the channel estimation results corresponding to the 10 SRS. For example, a UE whose channel correlation is lower than a preset threshold is used as the paired UE.

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

The dimensionality of the SU-BF weight is the number of transmitting antennas of the network equipment multiplied by the number of data streams of the terminal equipment. 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 can calculate the SU-BF weight corresponding to each terminal device by using any one of the above algorithms.

Step 203: the network device performs joint orthogonalization processing on the SU-BF weights respectively 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 power ratio (SLNR), Block Diagonalization (BD), and the like. The network device may calculate the MU-BF weight corresponding to each terminal device by using any one of the above orthogonalization algorithms.

Step 204: and the network equipment respectively sends corresponding data and reference signals to the N terminal equipment 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 data to be sent to the kth terminal device by using the MU-BF weight corresponding to the kth terminal device, and the reference signal sent to the kth terminal device is a reference signal obtained by precoding the reference signal to be sent to the kth terminal device by 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 flow shown in fig. 3 as an example, for data and a reference signal sent by a network device to a kth terminal device, a bit stream is first encoded by a scrambling code, the bit stream is mapped to a symbol stream by modulation mapping, the symbol stream is then mapped to a data stream by layer mapping, a precoding operation shown in a virtual box in fig. 3 is then performed, that is, the data stream is multiplied by an MU-BF weight corresponding to the kth terminal device, and finally, the precoded data stream is generated to an OFDM symbol by two processes of resource unit mapping and OFDM symbol generation, and is transmitted through an antenna port. It should be understood that the present application only uses the LTE coding procedure as an example, and may also be a coding procedure of a future communication system, which is not limited in the present application.

As described above, before transmitting data, reference signals, and the like to the terminal device, the network device needs to perform operations requiring encoding on the data and the reference signals.

The reference signal referred to in the embodiments of the present application is a demodulation reference signal (DMRS).

It should be understood that fig. 2 illustrates one of the plurality of terminal devices as an example, and the other terminal devices in the plurality of terminal devices communicating with the network device may refer to the process of the terminal device communicating with the network device.

Step 205: the terminal equipment selects the receiver to demodulate the data received from the network equipment according to the self configuration.

Specifically, each terminal device may select a receiver according to its own configuration, for example, a Maximum Ratio Combining (MRC) receiver, an Interference Rejection Combining (IRC) receiver, a Maximum Likelihood Detector (MLD) receiver, a Successive Interference Cancellation (SIC) receiver, and the like may be selected, and the specific selection of the receiver by each terminal device depends on a specific algorithm implementation of the terminal device.

However, as shown in fig. 2, in the existing algorithm, joint orthogonalization is performed on SU-BF weights corresponding to N terminal devices respectively to obtain MU-BF weights, when the number of data streams of the terminal devices is less than the number of receiving antennas of the terminal devices, the dimension of a channel space after the joint orthogonalization is less than the channel dimension, a non-orthogonalization channel space exists, and the non-orthogonalization channel space introduces interference from other terminal devices when the terminal device receives signals from a network device, which causes data demodulation performance loss of the terminal device and affects capacity gain. In particular, when the number of paired terminal devices is large, the problem of interference between terminal devices becomes more significant.

Referring to fig. 4, an embodiment of the present application provides a transmitting and receiving method for a multi-antenna system, so as to solve the problem of interference between UEs in the above-mentioned scheme. The method comprises the following steps:

the network device may first determine the paired terminal device, which may specifically refer to step 201, and repeated details are not described here. The following description will be given taking as an example a case where a network device communicates with any one of the above-described paired terminal devices.

Step 400: the network equipment determines a first weight and a second weight used for precoding, wherein the first weight is different from the second weight.

In a first possible implementation manner, the first weight is an MU-BF weight corresponding to the terminal device, and the second weight is a weight obtained by multiplying an 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 using algorithms such as EBF or MRT.

The MU-BF weights corresponding to the terminal devices are obtained by performing joint orthogonalization processing on SU-BF weights corresponding to the paired terminal devices respectively, and specifically, algorithms such as ZF, SLNR, or BD and the like can be adopted.

It should be understood that the above algorithms are only examples and are not intended to limit the embodiments of the present application.

The received power of the data is the power of a signal obtained by removing interference and noise from the data received by the terminal device. The received power of the reference signal refers to the power of a signal from which interference and noise are removed from the reference signal received by the terminal device. The fact that the received power of the data is the same as that of the reference signal means that when the terminal device performs demodulation by using the receiver, the received power of the data is consistent with that of the reference signal, so that the data can be correctly demodulated. Wherein 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 with interference and noise removed from the signal received by the receiver, or the power of the data stream with interference and noise removed from the data stream received by the receiver.

In a possible design, if the MU-BF weights corresponding to the terminal devices are obtained by performing joint orthogonalization processing on the SU-BF weights respectively corresponding to the paired terminal devices by using a ZF algorithm, the first matrix is a diagonal matrix, and the dimensionality of the first matrix is the data stream number of the terminal devices multiplied by the data stream number of the terminal devices. Each diagonal element corresponds to a power compensation factor of a data stream, and the power compensation factor of each data stream is the ratio of the receiving power of the data stream at the terminal equipment side when the data stream is precoded by adopting an MU-BF weight value to the receiving power of the data stream at the terminal equipment side when the data stream is precoded by adopting an SU-BF weight value. The network device may determine the power compensation factor for 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 obtained by multiplying a corresponding SU-BF weight by a power compensation factor of the data stream, the received power of the data stream at the terminal device side is equal to the received power of the data stream at the terminal device side when the data stream is precoded by using a corresponding MU-BF weight.

As can be seen from the above, the data to be sent to the terminal device is precoded by using the MU-BF weight, and the reference signal to be sent to the terminal device is precoded by using the weight obtained by multiplying the SU-BF weight by the first matrix, so that the received power of the data is the same as the received power of the reference signal.

In addition, if the MU-BF weights corresponding to the terminal devices are obtained by performing joint orthogonalization processing on the SU-BF weights respectively corresponding to the paired terminal devices by using other algorithms except the ZF algorithm, the first matrix is not a diagonal matrix, and 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 an MU-BF weight corresponding to the terminal device, and the second weight is an SU-BF weight corresponding to the terminal device. At this time, the network device also needs to send first information to the terminal device; wherein the first information is used for indicating a first matrix, and the first matrix is used for enabling the received power of the data to be the same as that 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 repeated descriptions are omitted here.

The first possible implementation manner is different from the second possible implementation manner in that when the network device transmits data and the reference signal by using the first weight and the second weight in 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 may demodulate the data by using the MRC receiver directly according to the channel estimated by the reference signal. When the network device sends data and a reference signal by using the first weight and the second weight of the second possible implementation manner, the receiving power of the data received by the terminal device is different from the receiving power of the reference signal, the terminal device needs to determine an updated channel according to the channel estimated by the reference signal and the first matrix so as to eliminate the influence on the terminal device to demodulate the data due to the difference between the receiving power of the data and the receiving power of the reference signal, and then the terminal device demodulates the data by using the MRC receiver according to the updated channel.

Step 410: the network equipment sends data and a reference signal to the terminal equipment, wherein the data is the data subjected to precoding by using a first weight value, and the reference signal is the reference signal subjected to precoding by using a second weight value.

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.

In addition, in one possible design, the network device sends second information to the terminal device, where the second information is used to instruct the terminal device to demodulate 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, a MuBf mode (MuBfMode) ═ 0 indicates that the terminal device selects a receiver according to its own configuration, that is, the network device does not use the transmission method provided in the embodiment of the present application to transmit data and a reference signal to the terminal device, and a MuBfMode ═ 1 indicates that the terminal device uses the MRC receiver to demodulate data, that is, the network device uses the transmission method provided in the embodiment of the present application to transmit data and a reference signal to the terminal device.

Besides instructing the terminal device to demodulate data by using the MRC receiver through the second information, the network device may also inform the terminal device to demodulate data by using the MRC receiver in an implicit manner. For example, the terminal device may 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 demodulates the data using the MRC receiver.

It should be understood that, besides the MRC receiver, the terminal device may also use a receiver with similar functions, and the embodiment of the present application does not limit that the terminal device can only use the MRC receiver.

Step 420: the terminal equipment receives the reference signal and the data from the network equipment, and the terminal equipment demodulates the data by adopting 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 meanwhile, the SU _ BF weight corresponding to the terminal device is orthogonal to the MU-BF weight corresponding to the paired terminal device. Because the reference signal sent by the network device to the terminal device is the reference signal precoded by using the weight obtained by multiplying the SU _ BF weight or the SU-BF weight by the first matrix, and the data sent by the network device to the paired terminal device is the data precoded by using the MU-BF weight corresponding to the paired terminal device, when the terminal device receives the signal by using the MRC receiver according to the channel estimated by the received reference signal, the data sent by the network device to the paired terminal device cannot be received, and the terminal device cannot be interfered by other paired terminal devices, so that the interference between the terminal devices can be completely inhibited, the demodulation performance of the terminal device can be improved, and the system capacity can be improved.

The embodiment shown in fig. 4 will be described in detail with reference to specific examples.

The base station determines that UE1 is a paired two UE with UE2, UE1 and UE2 both have 4 receive antennas, and the base station (with 4 transmit antennas) transmits 2 data streams to each UE. Fig. 5 shows a Singular Value Decomposition (SVD) decomposition of the 4x4 (number of transmit antennas of base station times number of receive antennas of UE 1) channel matrix for UE 1.

In SVD, i.e., singular value decomposition, i.e., an m × n matrix H is decomposed into H ═ U Σ VH. Where U is a unitary matrix of order mxm; Σ is an mxn order non-negative real diagonal matrix; VH, the conjugate transpose of V, is a unitary matrix of order n × n. Such a decomposition is called the singular value decomposition of M. The element λ i on the sigma diagonal is the singular value of M, and the singular values are arranged from large to small, with λ 0 being 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 the UE1, and U is a unitary matrix of 4 × 4 order; Σ is a 4 × 4 order non-negative real diagonal matrix; v is a unitary matrix of 4 × 4 order, V0, V1, V2, and V3 are 4 right singular vectors of H, corresponding to singular values λ 0, λ 1, λ 2, λ 3, respectively; similarly, u0, u1, u2, and u3 are 4 left singular vectors of H, corresponding to singular values λ 0, λ 1, λ 2, and λ 3, respectively. The SU-BF weight of the UE1 is a matrix [ v0, v1], wherein v0 and v1 respectively represent right singular vectors corresponding to a maximum singular value and a second maximum singular value; when the MU-BF weight is calculated, only v0 and v1 are subjected to ZF joint orthogonalization, but v2 and v3 are not subjected to ZF joint orthogonalization, so that the signal of the UE2 enters the received signal of the UE1 from the channel space of v2 and v3 to cause interference to the UE1, but if the signal is received only in the [ u0, u1] space corresponding to the zero forcing direction, namely the UE1 performs receiving equalization by multiplying the conjugate transpose of [ u0, u1] by the received signal of the UE1, the equalized signal can have no interference of the UE 2. And when the DMRS received by the UE1 is the DMRS precoded by using the second weight, the channel estimated by the UE1 according to the DMRS is [ u0, u1], and the UE1 performs receiving equalization by using the estimated channel at this time, so that the interference of the UE2 is avoided.

Based on the above embodiments, an embodiment of the present application provides a transmitting apparatus for a multi-antenna system, and referring to fig. 6, the apparatus 600 includes:

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

a sending unit 602, configured to send data and a reference signal to a terminal device, where the data is precoded by using the first weight, and the reference signal is precoded by using the second weight.

the sending unit 602 is further configured to: sending first information to the terminal equipment;

wherein the first information is used for indicating a first matrix, and the first matrix is used for enabling the received power of the data to be the same as the received power of the reference signal.

In one possible design, the sending unit 602 is further configured to: and sending second information to the terminal equipment, wherein the second information is used for indicating the terminal equipment to demodulate the data by adopting a Maximal Ratio Combining (MRC) receiver.

Based on the above embodiments, the present application provides a receiving apparatus for a multi-antenna system, and referring to fig. 7, the apparatus 700 includes:

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

a processing unit 702, configured to demodulate the data with an MRC receiver according to the channel estimated by the reference signal.

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

the processing unit 702 is specifically configured to:

In one possible design, the receiving unit 701 is further configured to: prior to receiving the reference signal and the data from the network device, receiving second information from the network device, the second information for instructing the apparatus to demodulate the data with the MRC receiver.

It should be understood that the above division of each unit is only a division of a logical function, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these units can be implemented entirely in software, invoked by a processing element; or may be implemented entirely in hardware; part of the units can also be realized in the form of software called by a processing element, and part of the units can be realized in the form of hardware. In implementation, the steps of the method or the units above may be implemented by hardware integrated logic circuits in a processor element or instructions in 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 (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), etc. As another example, when one of the above units is implemented in the form of a Processing element scheduler, the Processing element may be a general purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling programs. As another example, these units may be integrated together and implemented in the form of a system-on-a-chip (SOC).

Based on the above embodiments, an embodiment of the present application further provides a network device, and as shown in fig. 8, the network device 800 includes: a transceiver 801, a processor 802, a memory 803. Wherein the memory 803 is used for storing computer programs; the processor 802 invokes the computer program stored in the memory 803 to perform the method described above and illustrated in fig. 3 via the transceiver 801.

It is understood that the apparatus in the embodiment shown in fig. 6 described above can be implemented in the network device 800 shown in fig. 8. Specifically, the transmitting unit 601 may be implemented by the transceiver 801, and the processing unit 602 may be implemented by the processor 802. The structure of the network device 800 is not limited to the embodiments of the present application.

Based on the above embodiments, an embodiment of the present application further provides a terminal device, as shown in fig. 9, where the terminal device 900 includes: a transceiver 901, a processor 902, a memory 903. Wherein the memory 903 is used for storing computer programs; the processor 902 invokes a computer program stored in the memory 903 to perform the method described above and illustrated in fig. 3 via the transceiver 901.

It is understood that the apparatus in the embodiment shown in fig. 7 described above can be implemented by the terminal device 900 shown in fig. 9. Specifically, the processing unit 702 may be implemented by the processor 902, and the receiving unit 701 may be implemented by the transceiver 901. The structure of the terminal device 900 is not limited to the embodiment of the present application.

In fig. 8 and 9, the processor may be a CPU, a Network Processor (NP), a hardware chip, or any combination thereof. The memory may include volatile memory (volatile memory), such as Random Access Memory (RAM); the memory may also include a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory (flash memory), a Hard Disk Drive (HDD), or a solid-state drive (SSD); the memory may also comprise a combination of memories of the kind described above.

In summary, the network device determines the first weight and the second weight used for precoding by using the method provided in the embodiment of the present application, where the first weight is different from the second weight. The network equipment sends data and a reference signal to the terminal equipment, wherein the data is the data subjected to precoding by using a first weight value, and the reference signal is the reference signal subjected to precoding by using a second weight value. For any terminal device paired with the terminal device, because the reference signal sent by the network device to the terminal device is the reference signal precoded by using the second weight corresponding to the terminal device, and the data sent by the network device to the paired terminal device is the data precoded by using the first weight corresponding to the paired terminal device, when the terminal device receives the signal by using the MRC receiver according to the channel estimated by the received reference signal, the data sent by the network device to the paired terminal device cannot be received, and the terminal device cannot be interfered by other paired terminal devices, so that the interference between the terminal devices can be completely suppressed, the problem of the interference between UEs in the prior art is solved, the demodulation performance of the terminal device is improved, and the system capacity is improved.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, 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 aspects. Furthermore, embodiments of the present application may 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, and the like) having computer-usable program code embodied therein.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A method for transmitting in a multiple antenna system, the method comprising:

the network equipment determines a first weight and a second weight used for precoding, wherein the first weight is different from the second weight;

the network equipment sends data and a reference signal to terminal equipment, wherein the data is precoded by using the first weight, and the reference signal is precoded by using the second weight;

the first weight is a multi-user beamforming MU-BF weight corresponding to the terminal device, and the second weight is a weight obtained by multiplying a single-user beamforming SU-BF weight corresponding to the terminal device by a first matrix; the first matrix is used for enabling the received power of the data to be the same as that of the reference signal; or, the first weight is an MU-BF weight corresponding to the terminal device, and the second weight is an SU-BF weight corresponding to the terminal device; the method further comprises the following steps: the network equipment sends first information to the terminal equipment; wherein the first information is used for indicating a first matrix, and the first matrix is used for enabling the received power of the data to be the same as the received power of the reference signal.

2. The method of claim 1, wherein the method further comprises:

and the network equipment sends second information to the terminal equipment, wherein the second information is used for indicating the terminal equipment to demodulate the data by adopting a maximum ratio combining MRC receiver.

3. A receiving method for a multi-antenna system, the method comprising:

the method comprises the steps that terminal equipment receives reference signals and data from network equipment, wherein the data are precoded by using a first weight value, the reference signals are precoded by using a second weight value, and the first weight value is different from the second weight value;

the terminal equipment demodulates the data by adopting an MRC receiver according to the channel estimated by the reference signal;

the first weight is an MU-BF weight corresponding to the terminal device, and the second weight is a weight obtained by multiplying an SU-BF weight corresponding to the terminal device by a first matrix; the first matrix is used for enabling the received power of the data to be the same as that of the reference signal; or, the first weight is an MU-BF weight corresponding to the terminal device, and the second weight is an 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 comprises the following steps: the terminal device receives first information from the network device, wherein the first information is used for indicating a first matrix, and the first matrix is used for enabling the received power of the data to be the same as that of the reference signal.

4. The method of claim 3, wherein the terminal device demodulates the data with an MRC receiver according to the channel estimated by the reference signal, comprising:

the terminal equipment determines an updated channel according to the channel estimated by the reference signal and the first matrix;

and the terminal equipment demodulates the data by adopting an MRC receiver according to the updated channel.

5. The method of claim 3 or 4, wherein prior to the terminal device receiving the reference signal and the data from the network device, further comprising:

and the terminal equipment receives second information from the network equipment, wherein the second information is used for indicating the terminal equipment to demodulate the data by adopting the MRC receiver.

6. A transmitting apparatus of a multiple antenna system, the apparatus comprising:

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

the first weight is a multi-user beamforming MU-BF weight corresponding to the terminal device, and the second weight is a weight obtained by multiplying a single-user beamforming SU-BF weight corresponding to the terminal device by a first matrix; the first matrix is used for enabling the received power of the data to be the same as that of the reference signal; or, the first weight is an MU-BF weight corresponding to the terminal device, and the second weight is an SU-BF weight corresponding to the terminal device; the sending unit is further configured to: sending first information to the terminal equipment; wherein the first information is used for indicating a first matrix, and the first matrix is used for enabling the received power of the data to be the same as the received power of the reference signal.

7. The apparatus of claim 6, wherein the sending unit is further configured to:

and sending second information to the terminal equipment, wherein the second information is used for indicating the terminal equipment to demodulate the data by adopting a Maximal Ratio Combining (MRC) receiver.

8. A receiving apparatus of a multi-antenna system, the apparatus comprising:

a processing unit, configured to demodulate the data with an MRC receiver according to the channel estimated by the reference signal;

the first weight is an MU-BF weight corresponding to the device, and the second weight is a weight obtained by multiplying an SU-BF weight corresponding to the device by a first matrix; the first matrix is used for enabling the received power of the data to be the same as that of the reference signal; or the first weight is an MU-BF weight corresponding to the device, and the second weight is an SU-BF weight corresponding to the device; the receiving unit is further configured to: before receiving a reference signal and data from a network device, receiving first information from the network device, the first information indicating a first matrix for making a received power of the data the same as a received power of the reference signal.

9. The apparatus as claimed in claim 8, wherein said processing unit is specifically configured to:

10. The apparatus of claim 8 or 9, wherein the receiving unit is further configured to:

11. A computer storage medium having stored thereon computer-executable instructions that, when run on a communication device, cause the communication device to perform the method of any one of claims 1 to 5.

12. A multi-antenna system transmission apparatus, comprising a processor and a storage medium storing instructions that, when executed by the processor, cause the processor to perform the method according to any one of claims 1 to 2.

13. A multi-antenna system receiving apparatus, the apparatus comprising a processor and a storage medium storing instructions that, when executed by the processor, cause the processor to perform the method of any one of claims 3 to 5.