CN107094038B - Method, device and system for adjusting power of antenna system - Google Patents

Method, device and system for adjusting power of antenna system Download PDF

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CN107094038B
CN107094038B CN201710127716.1A CN201710127716A CN107094038B CN 107094038 B CN107094038 B CN 107094038B CN 201710127716 A CN201710127716 A CN 201710127716A CN 107094038 B CN107094038 B CN 107094038B
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clipping
transmitting
target signal
terminal
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CN107094038A (en
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邹志强
吴亚琦
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

The application discloses a method for adjusting power of an antenna system, which comprises the following steps: multi-user channel matrix for antenna system
Figure DDA0001238984570000011
Performing singular value decomposition to determine the content
Figure DDA0001238984570000012
Diagonal matrix of singular values
Figure DDA0001238984570000013
According to
Figure DDA0001238984570000014
Determining a beamforming weight matrix for a signal to be transmitted
Figure DDA0001238984570000015
Increasing the target signal according to the signal transmission requirements of the first terminal
Figure DDA0001238984570000016
The beam forming weight in the first terminal is used for increasing the transmitting power of a target signal, and the target signal is a signal to be sent to the first terminal; according to the error vector magnitude EVM of the first terminal, performing beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal with increased power, and performing beam domain clipping on the target signal at NtNoise signals generated by clipping are redistributed among the transmitting antennas. The scheme provided by the embodiment of the application can increase the capacity of the antenna system as much as possible by increasing the transmission power of part of user signals, and can avoid the hardware capacity constraint of the antenna system by beam domain clipping and noise signal redistribution.

Description

Method, device and system for adjusting power of antenna system
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for adjusting power of an antenna system.
Background
The Multiple Input Multiple Output (MIMO) technology increases the number of transmitting antennas and receiving antennas, forms a plurality of parallel transmission channels between transmitting and receiving ends, and provides the spectral efficiency of the system by performing parallel transmission of data using the channels. Multiple data streams may be transmitted over these parallel channels. If the Multiple data streams are for the same User, they are referred to as Single User-Multiple Input Multiple Output (SU-MIMO), and if the Multiple data streams are for Multiple users, they are referred to as multi User-Multiple Input Multiple Output (MU-MIMO).
MU-MIMO can further improve the spatial multiplexing gain and thus the capacity of the system. Meanwhile, each user in MU-MIMO suffers from two kinds of interference: one is multi-user interference (MUI) caused by data of other users; the second is interference (ISI) between the users' own multiple data streams. These two types of interference may affect the MU-MIMO system gain.
In a large-scale multi-user multi-input multi-output (Massive MU-MIMO) system, interference among users can be effectively inhibited by processing a transmitting-end precoding matrix by using a transmitting-end interference inhibition algorithm on a downlink transmitting side. In signal transmission, transmission power needs to be allocated to each transmitting antenna, and the transmission power and channel state of each antenna may affect the capacity of the antenna system. If the total power of the antenna system is equally allocated to each antenna without considering the channel status, the capacity of the antenna system is necessarily affected. If the maximum transmitting power is adopted for transmitting, the system capacity is still influenced because each antenna cannot transmit the maximum transmitting power due to the limitation of the total power.
Disclosure of Invention
The embodiment of the application provides a method for adjusting power of a multi-antenna system, which can increase the capacity of the antenna system as much as possible by increasing the transmission power of part of user signals, reduce the power of the increased antenna by a beam domain clipping method for the antenna with increased power, and redistribute noise signals generated by clipping, thereby not only improving the capacity of the antenna system, but also avoiding the hardware capacity constraint of the antenna system. The embodiment of the application also provides a corresponding device and a corresponding system.
This applicationA first aspect provides a method of power adjustment for an antenna system, the antenna system being a multi-user multiple-input multiple-output (MU-MIMO) antenna system, the antenna system comprising a plurality of transmit antennas and a plurality of receive antennas, the method comprising: multi-user channel matrix for antenna system
Figure BDA0001238984550000021
Performing singular value decomposition to determine the content
Figure BDA0001238984550000022
Diagonal matrix of singular values
Figure BDA0001238984550000023
Wherein N istFor the number of transmitting antennas, NrIs the number of receive antennas; according to
Figure BDA0001238984550000024
Determining a beamforming weight matrix for a signal to be transmitted
Figure BDA0001238984550000025
Wherein the content of the first and second substances,
Figure BDA0001238984550000026
in the beam forming weight QiiAnd
Figure BDA0001238984550000027
singular value λ ofiPositive correlation; increasing the target signal according to the signal transmission requirements of the first terminal
Figure BDA0001238984550000028
The beam forming weight in the first terminal is used for increasing the transmitting power of a target signal, and the target signal is a signal to be sent to the first terminal; according to the error vector magnitude EVM of the first terminal, performing beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal with increased power, and performing beam domain clipping on the target signal at NtNoise signals generated by clipping are redistributed among the transmitting antennas. As can be seen from the first aspect described above, the enlarged portionThe capacity of an antenna system is increased as much as possible by dividing the transmitting power of user signals, the power of the increased antenna is reduced by a beam domain clipping method for the antenna with increased power, and then noise signals generated by clipping are redistributed, so that the capacity of the antenna system is improved, and the hardware capacity constraint of the antenna system is avoided.
With reference to the first aspect, in a first possible implementation manner, the step in the first aspect is: multi-user channel matrix for antenna system
Figure BDA0001238984550000029
Performing singular value decomposition to determine
Figure BDA00012389845500000210
Is diagonal matrix of
Figure BDA00012389845500000211
The method comprises the following steps: according to
Figure BDA00012389845500000212
Determining
Figure BDA00012389845500000213
Wherein the content of the first and second substances,
Figure BDA00012389845500000214
is a first unitary matrix of a first type,
Figure BDA00012389845500000215
is a second unitary matrix. As can be seen from the first possible implementation manner of the first aspect, the diagonal matrix can be accurately determined by singular value decomposition
Figure BDA00012389845500000216
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the foregoing steps: according to the signal transmission requirement of the first terminal, increasing the beamforming weight of the target signal further comprises: based on zero-forcing criterion or minimum mean square error criterionDetermining a precoding matrix for a signal to be transmitted
Figure BDA00012389845500000217
Wherein, the zero forcing criterion is as follows:
Figure BDA00012389845500000218
the minimum mean square error criterion is:
Figure BDA00012389845500000219
wherein the content of the first and second substances,
Figure BDA00012389845500000220
is composed of
Figure BDA00012389845500000221
Conjugate transpose matrix of σ2Is the minimum mean square error of the noise. As can be seen from the second possible implementation manner of the first aspect, the signal may be accurately precoded according to a zero forcing criterion or a minimum mean square error criterion.
With reference to the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner, in a third possible implementation manner, the foregoing steps: according to
Figure BDA0001238984550000031
Determining a beamforming weight matrix for a signal to be transmitted
Figure BDA0001238984550000032
The method comprises the following steps: determining a beamforming weight matrix according to the following formula
Figure BDA0001238984550000033
The beamforming weight in (1):
Figure BDA0001238984550000034
wherein, PTIs the total transmit power of the antenna system,
Figure BDA0001238984550000035
and
Figure BDA0001238984550000036
respectively as follows:
Figure BDA0001238984550000037
as can be seen from the third possible implementation manner of the first aspect, the diagonal matrix is used
Figure BDA0001238984550000038
The beam forming weight matrix can be determined
Figure BDA0001238984550000039
Thereby passing through
Figure BDA00012389845500000310
Power allocation is achieved.
With reference to the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner, in a fourth possible implementation manner, the foregoing steps: according to the error vector magnitude EVM of the first terminal, the wave beam domain clipping is carried out on the target signal in a transmitting antenna which transmits the target signal after the power is increased, and the method comprises the following steps: determining a clipping threshold according to the EVM of the first terminal; the target signal is beam-domain clipped in the transmit antenna from which the target signal is transmitted, according to a clipping threshold. As can be seen from the fourth possible implementation manner of the first aspect, the EVM of the first terminal is considered during the clipping processing, so that the first terminal can be ensured to successfully decode the received signal, and the transmission power of the antenna with increased power can be reduced through clipping, so that the hardware capability constraint of the antenna system is avoided.
With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the foregoing steps: increasing the target signal according to the signal transmission requirements of the first terminal
Figure BDA00012389845500000311
The beamforming weights in (1) include: determining the number and the increasing amplitude of first terminals needing to increase the transmitting power; according to the increase of the amplitude each timeAnd the beam forming weight of the target signal of the first terminal. As can be seen from the fifth possible implementation manner of the first aspect, the first terminals whose transmission powers need to be increased are determined, and the powers of the signals of the first terminals are increased by increasing the beamforming weights, so that the gain of the signals sent to the first terminals can be improved, and the reception quality of the signals of the first terminals can be improved.
With reference to the first aspect, the first or second possible implementation manner of the first aspect, in a sixth possible implementation manner, the foregoing step: in NtRedistributing noise signals generated by clipping in each transmitting antenna, comprising: in NtRedistributing noise signals generated by clipping in the full space dimension of the transmitting antennas to NtA portion of the noise signal is distributed among each of the plurality of transmit antennas. As can be seen from the sixth possible implementation manner of the first aspect, the noise signal generated by clipping is distributed to each transmitting antenna for transmission, so that the power of the antennas with increased power is reduced, and the gain of the signals with increased power can be increased.
With reference to the first aspect, the first or second possible implementation manner of the first aspect, in a seventh possible implementation manner, the foregoing step: in NtRedistributing noise signals generated by clipping in each transmitting antenna, comprising: in NtThe noise signal generated by clipping is redistributed in the null-space dimension of the transmitting antennas to NtThe transmitting antenna in an idle state among the transmitting antennas distributes a noise signal. As can be seen from the seventh possible implementation manner of the first aspect, the noise signal generated by clipping is distributed to the transmitting antennas in the idle state for transmission, so that the power of the antennas with increased power is reduced, and the gain of the signals with increased power can be increased.
A second aspect of the present invention provides an apparatus for adjusting power of an antenna system, where the apparatus is configured to implement the functions of the method provided in the first aspect or any optional implementation manner of the first aspect, and the apparatus is implemented by hardware/software, where the hardware/software includes units corresponding to the functions.
A further aspect of the present application provides a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to perform the method of the first aspect or any of the possible implementations of the first aspect.
A further aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect or any of the possible implementations of the first aspect.
Compared with the prior art that the capacity of the antenna system is limited by the total power of the antenna system, so that the capacity cannot be increased, the method for adjusting the power of the antenna system provided by the embodiment of the application can increase the capacity of the antenna system as much as possible by increasing the transmission power of part of user signals, reduce the power of the increased antenna by a method of wave beam domain clipping for the antenna with increased power, and redistribute noise signals generated by clipping, so that the capacity of the antenna system is improved, and the hardware capacity constraint of the antenna system is avoided.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a wireless communication system;
fig. 2 is a schematic diagram of the principle of downlink transmission of the antenna system;
fig. 3 is an exemplary schematic diagram of downlink transmission and reception of the antenna system in the embodiment of the present application;
fig. 4 is a schematic diagram of an embodiment of a method for adjusting antenna power in an embodiment of the present application;
fig. 5 is a schematic diagram of an embodiment of an apparatus for antenna power adjustment in the embodiment of the present application;
fig. 6 is a schematic diagram of an embodiment of a base station in the embodiment of the present application.
Detailed Description
Embodiments of the present application will now be described with reference to the accompanying drawings, and it is to be understood that the described embodiments are merely illustrative of some, but not all, embodiments of the present application. As can be appreciated by those skilled in the art, with the development of the antenna system, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.
The embodiment of the application provides a method for adjusting power of a multi-antenna system, which can increase the capacity of the antenna system as much as possible by increasing the transmission power of part of user signals, reduce the power of the increased antenna by a beam domain clipping method for the antenna with increased power, and redistribute noise signals generated by clipping, thereby not only improving the capacity of the antenna system, but also avoiding the hardware capacity constraint of the antenna system. The embodiment of the application also provides a corresponding device and a corresponding system. The following are detailed below.
Fig. 1 is a diagram of an embodiment of a wireless communication system.
As shown in fig. 1, the wireless communication system includes a base station including a plurality of transmission antennas and a plurality of reception antennas, and a plurality of terminals. The antenna system of the base station is an MU-MIMO antenna system.
Fig. 2 is a schematic diagram of the principle of downlink transmission of the MU-MIMO antenna system.
As shown in fig. 2, in the MU-MIMO antenna system, signals to be transmitted may be mapped to transmit antennas through space-time mapping, and transmitted by the transmit antennas. The transmitting antenna has a plurality of antennas, and each transmitting antenna can transmit signals of a plurality of terminals. That is, signals transmitted by the base station to one terminal can be mapped to a plurality of antennas respectively for transmission.
The signal to be transmitted needs to be beamformed before being mapped onto the antennas, and beamforming generally includes power allocation and precoding. The beam forming is a signal preprocessing technology based on an antenna array, and generates a directional beam by adjusting the weighting coefficient of each array element in the antenna array, so that obvious array gain can be obtained.
As shown in fig. 3, if the signal to be transmitted is signal X, signal X is split into X1、x2、…xrAnd sending, wherein the signal subjected to power distribution is a signal Y, and the signal Y is:
Figure BDA0001238984550000061
and precoding the signals after power distribution, wherein a precoded signal Y is as follows:
Figure BDA0001238984550000062
in the embodiment of the present application, the signal Y is continuously changed along with the beamforming process.
The signal Y after pre-coding is mapped to antenna for transmission and passes through multi-user channel matrix
Figure BDA0001238984550000063
The last receiving side receives a signal Y:
Figure BDA0001238984550000071
in the embodiment of the application, the multi-user channel matrix
Figure BDA0001238984550000072
Is known, and needs to be according to the embodiment of the application
Figure BDA0001238984550000073
Find out
Figure BDA0001238984550000074
And
Figure BDA0001238984550000075
the determination is described below
Figure BDA0001238984550000076
The process of (1). Determining
Figure BDA0001238984550000077
Multi-user channel matrix requiring first pair of said antenna systems
Figure BDA0001238984550000078
Performing singular value decomposition to determine whether the reference signal contains the above
Figure BDA0001238984550000079
Diagonal matrix of singular values
Figure BDA00012389845500000710
Wherein N istFor the number of transmitting antennas, NrIs the number of receive antennas.
The singular value decomposition process comprises the following steps:
Figure BDA00012389845500000711
wherein the content of the first and second substances,
Figure BDA00012389845500000712
is a first unitary matrix of a first type,
Figure BDA00012389845500000713
the matrix is a non-negative fixed diagonal matrix, and is referred to as a diagonal matrix in the embodiment of the application for short; if N is presentr<NtThen, then
Figure BDA00012389845500000714
λiIs composed of
Figure BDA00012389845500000715
The non-zero element in (1) represents the system channel state matrix
Figure BDA00012389845500000716
The respective singular values of (a) and (b),
Figure BDA00012389845500000717
is a second unitary matrix. A unitary matrix is a matrix whose conjugate is inverted to its inverse.
According to the above
Figure BDA00012389845500000718
Determining a beamforming weight matrix for a signal to be transmitted
Figure BDA00012389845500000719
Wherein, the
Figure BDA00012389845500000720
In the beam forming weight QiiAnd the above-mentioned
Figure BDA00012389845500000721
Singular value λ ofiAnd (4) positively correlating.
The process of determining may be:
determining a beamforming weight matrix according to the following formula
Figure BDA00012389845500000722
The beamforming weight in (1):
Figure BDA00012389845500000723
wherein, PTFor the total transmit power of the antenna system,
Figure BDA0001238984550000081
and
Figure BDA0001238984550000082
respectively as follows:
Figure BDA0001238984550000083
from the above process, it can be determined
Figure BDA0001238984550000084
Determination in the examples of the present application
Figure BDA0001238984550000085
The process of (2) may be:
determining a precoding matrix of the signal to be transmitted based on a zero forcing criterion or a minimum mean square error criterion
Figure BDA0001238984550000086
Wherein the content of the first and second substances,
the zero forcing criterion is as follows:
Figure BDA0001238984550000087
the minimum mean square error criterion is:
Figure BDA0001238984550000088
wherein the content of the first and second substances,
Figure BDA0001238984550000089
is composed of
Figure BDA00012389845500000810
Conjugate transpose matrix of σ2Is the minimum mean square error of the noise.
After precoding is finished, a signal subjected to precoding processing is mapped to a transmitting antenna, because the system capacity C of an antenna system is positively correlated with power, the following is a relational expression of the system capacity:
Figure BDA00012389845500000811
in order to increase the system capacity of the antenna system, the transmission power of the antenna may be increased, but the power of the antenna system cannot be increased at will, so in the embodiment of the present application, according to the actual requirements of some terminals, the beamforming weights of the signals of the part of terminals are increased to increase the transmission power of the signals of the terminals. In the embodiment of the present application, a terminal that needs to increase a beamforming weight is defined as a first terminal, where the number of the first terminals may be multiple, and the first terminal may be a terminal that is farther from a base station and has a stronger signal quality requirement. The signal transmitted to the first terminal is defined as a target signal.
Said increasing of the target signal according to the signal transmission requirements of the first terminal
Figure BDA00012389845500000812
The beamforming weights in (1) may include: determining the number and the increasing amplitude of the first terminals needing to increase the transmitting power; and increasing the beam forming weight of the target signal of each first terminal according to the increase amplitude.
Since the target signal to the first terminal may be distributed over multiple antennas, the transmit power for the target signal increases, and the power of the antenna to which the target signal is mapped increases. In order to avoid the limitation of the hardware capability of the antenna system and not fit for the excessive transmission power on one or a plurality of antennas, in the embodiment of the application, the beam domain clipping is carried out on the target signal in the transmission antenna which transmits the target signal after the power is increased, and the N is the same as the NtNoise signals generated by clipping are redistributed among the transmitting antennas.
In the embodiment of the present application, clipping cannot be limited, and in order to ensure that the first terminal can perform demodulation correctly, a clipping threshold needs to be determined according to an Error Vector Magnitude (EVM) of the first terminal; and according to the clipping threshold, carrying out beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal. The error vector comprises a vector of amplitude and phase, and is a vector difference between an ideal error-free reference signal and an actual transmitting signal at a given moment, so that the amplitude error and the phase error of the modulation signal can be comprehensively measured. The EVM specifically indicates the proximity of an IQ component generated when the receiving terminal demodulates a signal to an ideal signal component, and is an index for considering the quality of the modulated signal. The smaller the EVM, the better the signal quality.
Noise signals generated by clipping can be redistributed in the full spatial dimension or the null spatial dimension.
Wherein, in the NtRedistributing noise signals generated by the clipping in the full spatial dimension of the transmitting antennasIs redistributed to be in the NtA portion of the noise signal is distributed among each of the plurality of transmit antennas.
In said NtRedistributing noise signals generated by the clipping in the zero-space dimension of the transmitting antennas to be in the NtThe transmitting antenna in an idle state among the transmitting antennas distributes the noise signal.
The above is a description of the power adjustment process of the present application in conjunction with a multi-user multiple-input multiple-output antenna system, and a method for adjusting the power of the antenna system in the embodiment of the present application is described below in conjunction with the accompanying drawings.
Referring to fig. 4, an embodiment of the method for adjusting power of an antenna system according to the present invention includes:
101. for the multi-user channel matrix of the antenna system
Figure BDA0001238984550000091
Performing singular value decomposition to determine whether the reference signal contains the above
Figure BDA0001238984550000092
Diagonal matrix of singular values
Figure BDA0001238984550000093
Wherein N istFor the number of transmitting antennas, NrIs the number of receive antennas.
102. According to the above
Figure BDA0001238984550000094
Determining a beamforming weight matrix for a signal to be transmitted
Figure BDA0001238984550000095
Wherein, the
Figure BDA0001238984550000096
In the beam forming weight QiiAnd the above-mentioned
Figure BDA0001238984550000097
Singular value λ ofiAnd (4) positively correlating.
103. Increasing the target signal according to the signal transmission requirements of the first terminal
Figure BDA0001238984550000101
The beamforming weight in (1) to increase the transmit power of the target signal, where the target signal is a signal to be sent to the first terminal.
104. According to the error vector magnitude EVM of the first terminal, carrying out wave beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal after increasing the power, and carrying out wave beam domain clipping on the target signal in the NtNoise signals generated by clipping are redistributed among the transmitting antennas.
Compared with the prior art that the capacity of the antenna system is limited by the total power of the antenna system, so that the capacity cannot be increased, the method for adjusting the power of the antenna system provided by the embodiment of the application can increase the capacity of the antenna system as much as possible by increasing the transmission power of part of user signals, reduce the power of the increased antenna by a method of wave beam domain clipping for the antenna with increased power, and redistribute noise signals generated by clipping, so that the capacity of the antenna system is improved, and the hardware capacity constraint of the antenna system is avoided.
Optionally, the multi-user channel matrix to the antenna system
Figure BDA0001238984550000102
Performing singular value decomposition to determine the
Figure BDA0001238984550000103
Is diagonal matrix of
Figure BDA0001238984550000104
The method can comprise the following steps:
according to
Figure BDA0001238984550000105
Determining the
Figure BDA0001238984550000106
Wherein the content of the first and second substances,
Figure BDA0001238984550000107
is a first unitary matrix of a first type,
Figure BDA0001238984550000108
is a second unitary matrix.
Optionally, before increasing the beamforming weight of the target signal according to the signal transmission requirement of the first terminal, the method may further include:
determining a precoding matrix of the signal to be transmitted based on a zero forcing criterion or a minimum mean square error criterion
Figure BDA0001238984550000109
Wherein the content of the first and second substances,
the zero forcing criterion is as follows:
Figure BDA00012389845500001010
the minimum mean square error criterion is:
Figure BDA00012389845500001011
wherein the content of the first and second substances,
Figure BDA00012389845500001012
is composed of
Figure BDA00012389845500001013
Conjugate transpose matrix of σ2Is the minimum mean square error of the noise.
Optionally, the method according to
Figure BDA00012389845500001014
Determining a beamforming weight matrix for a signal to be transmitted
Figure BDA00012389845500001015
The method can comprise the following steps:
determining a beamforming weight matrix according to the following formula
Figure BDA00012389845500001016
The beamforming weight in (1):
Figure BDA00012389845500001017
wherein, PTFor the total transmit power of the antenna system,
Figure BDA0001238984550000111
and
Figure BDA0001238984550000112
respectively as follows:
Figure BDA0001238984550000113
optionally, the performing, according to the error vector magnitude EVM of the first terminal, beam-domain clipping on the target signal in a transmitting antenna that transmits the target signal with increased power may include:
determining a clipping threshold according to the EVM of the first terminal;
and according to the clipping threshold, carrying out beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal.
Optionally, the target signal is increased according to the signal transmission requirement of the first terminal
Figure BDA0001238984550000114
The beamforming weights in (1) may include:
determining the number and the increasing amplitude of the first terminals needing to increase the transmitting power;
and increasing the beam forming weight of the target signal of each first terminal according to the increase amplitude.
Optionally, said at said NtIn a transmitting antennaRedistributing the noise signal generated by clipping may include:
in said NtRedistributing noise signals generated by the clipping in the full space dimension of the transmitting antennas to NtA portion of the noise signal is distributed among each of the plurality of transmit antennas.
Optionally, said at said NtRedistributing noise signals generated by clipping in the transmission antennas can include:
in said NtRedistributing noise signals generated by the clipping in the zero-space dimension of the transmitting antennas to be in the NtThe transmitting antenna in an idle state among the transmitting antennas distributes the noise signal.
The method for adjusting the power of the antenna system provided in the embodiment of the present application can be understood with reference to the related descriptions in fig. 1 to fig. 3, and will not be repeated herein.
Referring to fig. 5, an embodiment of the apparatus for adjusting power of an antenna system according to the present invention includes:
a decomposition processing unit 201 for a multi-user channel matrix for the antenna system
Figure BDA0001238984550000121
Performing singular value decomposition to determine whether the reference signal contains the above
Figure BDA0001238984550000122
Diagonal matrix of singular values
Figure BDA0001238984550000123
Wherein N istFor the number of transmitting antennas, NrIs the number of receive antennas;
a determining unit 202, configured to obtain the data according to the processing of the decomposition processing unit 201
Figure BDA0001238984550000124
Determining a beam of a signal to be transmittedShaped weight matrix
Figure BDA0001238984550000125
Wherein, the
Figure BDA0001238984550000126
In the beam forming weight QiiAnd the above-mentioned
Figure BDA0001238984550000127
Singular value λ ofiPositive correlation;
an adjusting unit 203 for increasing the signal determined by the determining unit 202 of the target signal according to the signal transmission requirement of the first terminal
Figure BDA0001238984550000128
The beamforming weight in the first terminal is used for increasing the transmitting power of the target signal, and the target signal is a signal to be sent to the first terminal;
a clipping processing unit 204, configured to perform beam domain clipping on the target signal in a transmitting antenna that transmits the target signal whose power is increased by the adjusting unit 203 according to an error vector magnitude EVM of the first terminal;
a redistribution unit 205 for redistributing at said NtNoise signals generated by clipping by the clipping processing unit 204 are redistributed among the transmission antennas.
Compared with the prior art that the capacity of the antenna system is limited by the total power of the antenna system, so that the capacity cannot be increased, the device for adjusting the power of the antenna system provided by the embodiment of the application can increase the capacity of the antenna system as much as possible by increasing the transmission power of part of user signals, reduce the power of the increased antenna by a beam domain clipping method for the antenna with increased power, and redistribute noise signals generated by clipping, so that the capacity of the antenna system is improved, and the hardware capacity constraint of the antenna system is avoided.
Optionally, the decomposition processing unit 201 is specifically configured to:
according to
Figure BDA0001238984550000129
Determining the
Figure BDA00012389845500001210
Wherein the content of the first and second substances,
Figure BDA00012389845500001211
is a first unitary matrix of a first type,
Figure BDA00012389845500001212
is a second unitary matrix.
Optionally, the determining unit 202 is further configured to:
determining a precoding matrix of the signal to be transmitted based on a zero forcing criterion or a minimum mean square error criterion
Figure BDA00012389845500001213
Wherein the content of the first and second substances,
the zero forcing criterion is as follows:
Figure BDA00012389845500001214
the minimum mean square error criterion is:
Figure BDA00012389845500001215
wherein the content of the first and second substances,
Figure BDA0001238984550000131
is composed of
Figure BDA0001238984550000132
Conjugate transpose matrix of σ2Is the minimum mean square error of the noise.
Optionally, the determining unit 202 is further configured to:
determining a beamforming weight matrix according to the following formula
Figure BDA0001238984550000133
The beamforming weight in (1):
Figure BDA0001238984550000134
wherein, PTFor the total transmit power of the antenna system,
Figure BDA0001238984550000135
and
Figure BDA0001238984550000136
respectively as follows:
Figure BDA0001238984550000137
optionally, the clipping processing unit 204 is specifically configured to:
determining a clipping threshold according to the EVM of the first terminal;
and according to the clipping threshold, carrying out beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal.
Optionally, the adjusting unit 203 is configured to:
determining the number and the increasing amplitude of the first terminals needing to increase the transmitting power;
and increasing the beam forming weight of the target signal of each first terminal according to the increase amplitude.
Optionally, the redistribution unit 205 is specifically configured to redistribute the data in the NtRedistributing noise signals generated by the clipping in the full space dimension of the transmitting antennas to NtA portion of the noise signal is distributed among each of the plurality of transmit antennas.
Optionally, the redistribution unit 205 is specifically configured to redistribute the data in the NtRedistributing noise signals generated by the clipping in the zero-space dimension of the transmitting antennas to be in the NtThe transmitting antenna in an idle state among the transmitting antennas distributes the noise signal.
The device for adjusting the power of the antenna system provided in the embodiment of the present application can be understood with reference to the related descriptions in fig. 1 to fig. 3, and will not be repeated herein.
Fig. 6 is a schematic structural diagram of a base station 30 according to an embodiment of the present application. The base station 30 includes a processor 310, a memory 350, and a transceiver 330, which transceiver 330 may be an antenna. Memory 350 may include both read-only memory and random-access memory, and provides operating instructions and data to processor 310. A portion of the memory 350 may also include non-volatile random access memory (NVRAM).
In some embodiments, memory 350 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof:
in the embodiment of the present application, by calling the operation instruction stored in the memory 350 (the operation instruction may be stored in the operating system),
for the multi-user channel matrix of the antenna system
Figure BDA0001238984550000141
Performing singular value decomposition to determine whether the reference signal contains the above
Figure BDA0001238984550000142
Diagonal matrix of singular values
Figure BDA0001238984550000143
Wherein N istFor the number of transmitting antennas, NrIs the number of receive antennas;
according to the above
Figure BDA0001238984550000144
Determining a beamforming weight matrix for a signal to be transmitted
Figure BDA0001238984550000145
Wherein, the
Figure BDA0001238984550000146
The wave beam inShaped weight QiiAnd the above-mentioned
Figure BDA0001238984550000147
Singular value λ ofiPositive correlation;
increasing the target signal according to the signal transmission requirements of the first terminal
Figure BDA0001238984550000148
The beamforming weight in the first terminal is used for increasing the transmitting power of the target signal, and the target signal is a signal to be sent to the first terminal;
according to the error vector magnitude EVM of the first terminal, carrying out wave beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal after increasing the power, and carrying out wave beam domain clipping on the target signal in the NtNoise signals generated by clipping are redistributed among the transmitting antennas.
Compared with the prior art that the capacity of the antenna system is limited by the total power of the antenna system, so that the capacity cannot be increased, the base station provided by the embodiment of the application can increase the capacity of the antenna system as much as possible by increasing the transmission power of part of user signals, reduce the power of the increased antenna by a beam domain clipping method for the antenna with increased power, and redistribute noise signals generated by clipping, thereby not only improving the capacity of the antenna system, but also avoiding the hardware capacity constraint of the antenna system.
The processor 310 controls the operation of the base station 30, and the processor 310 may also be referred to as a Central Processing Unit (CPU). Memory 350 may include both read-only memory and random-access memory, and provides instructions and data to processor 310. A portion of the memory 350 may also include non-volatile random access memory (NVRAM). The various components of the base station 30 in a particular application are coupled together by a bus system 320, wherein the bus system 320 may include a power bus, a control bus, a status signal bus, etc., in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 320 in the figures.
The method disclosed in the above embodiments of the present application may be applied to the processor 310, or implemented by the processor 310. The processor 310 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 310. The processor 310 may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 350, and the processor 310 reads the information in the memory 350 and completes the steps of the method in combination with the hardware.
Optionally, the processor 310 is specifically configured to:
according to
Figure BDA0001238984550000151
Determining the
Figure BDA0001238984550000152
Wherein the content of the first and second substances,
Figure BDA0001238984550000153
is a first unitary matrix of a first type,
Figure BDA0001238984550000154
is a second unitary matrix.
Optionally, the processor 310 is further configured to: based on zero forcing criterion or minimum mean square errorDetermining a precoding matrix of the signal to be transmitted according to a criterion
Figure BDA0001238984550000155
Wherein the content of the first and second substances,
the zero forcing criterion is as follows:
Figure BDA0001238984550000156
the minimum mean square error criterion is:
Figure BDA0001238984550000157
wherein the content of the first and second substances,
Figure BDA0001238984550000158
is composed of
Figure BDA0001238984550000159
Conjugate transpose matrix of σ2Is the minimum mean square error of the noise.
Optionally, the processor 310 is specifically configured to: determining a beamforming weight matrix according to the following formula
Figure BDA00012389845500001510
The beamforming weight in (1):
Figure BDA0001238984550000161
wherein, PTFor the total transmit power of the antenna system,
Figure BDA0001238984550000162
and
Figure BDA0001238984550000163
respectively as follows:
Figure BDA0001238984550000164
optionally, the processor 310 is specifically configured to:
determining a clipping threshold according to the EVM of the first terminal;
and according to the clipping threshold, carrying out beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal.
Optionally, the processor 310 is specifically configured to:
determining the number and the increasing amplitude of the first terminals needing to increase the transmitting power;
and increasing the beam forming weight of the target signal of each first terminal according to the increase amplitude.
Optionally, the processor 310 is specifically configured to:
in said NtRedistributing noise signals generated by the clipping in the full space dimension of the transmitting antennas to NtA portion of the noise signal is distributed among each of the plurality of transmit antennas.
Optionally, the processor 310 is specifically configured to:
in said NtRedistributing noise signals generated by the clipping in the zero-space dimension of the transmitting antennas to be in the NtThe transmitting antenna in an idle state among the transmitting antennas distributes the noise signal.
The above description of the base station 30 can be understood with reference to the descriptions of fig. 1 to fig. 3, and will not be repeated herein.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.
The computer instructions may be stored in or transmitted from a computer-readable storage medium to another computer-readable storage medium, e.g., from one website site, computer, server, or data center, via wire (e.g., coaxial cable, fiber optics, digital subscriber line (DS L)) or wirelessly (e.g., infrared, wireless, microwave, etc.) the computer-readable storage medium may be any available medium that a computer can store or a data storage device integrated with one or more available media, e.g., a magnetic medium, (e.g., a floppy Disk, a magnetic tape), an optical medium (e.g., a Solid State medium), a DVD, or a Solid State medium (e.g., SSD)).
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The method, apparatus, and system for adjusting power of an antenna system provided in the embodiments of the present application are described in detail above, and specific examples are applied herein to illustrate the principles and embodiments of the present application, and the description of the embodiments above is only used to help understand the method and core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (17)

1. A method for adjusting power of an antenna system, wherein the antenna system is a multiple-user multiple-input multiple-output antenna system, the method comprising:
for the multi-user channel matrix of the antenna system
Figure FDA0001238984540000011
Performing singular value decomposition to determine whether the reference signal contains the above
Figure FDA0001238984540000012
Diagonal matrix of singular values
Figure FDA0001238984540000013
Wherein N istFor the number of transmitting antennas, NrIs the number of receive antennas;
according to the above
Figure FDA0001238984540000014
Determining a beamforming weight matrix for a signal to be transmitted
Figure FDA0001238984540000015
Wherein, the
Figure FDA0001238984540000016
In the beam forming weight QiiAnd the above-mentioned
Figure FDA0001238984540000017
Singular value λ ofiPositive correlation;
increasing the target signal according to the signal transmission requirements of the first terminal
Figure FDA0001238984540000018
The beamforming weight in the first terminal is used for increasing the transmitting power of the target signal, and the target signal is a signal to be sent to the first terminal;
according to the error vector magnitude EVM of the first terminal, carrying out wave beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal after increasing the power, and carrying out wave beam domain clipping on the target signal in the NtNoise signals generated by clipping are redistributed among the transmitting antennas.
2. The method of claim 1, wherein said pairing is performed by said pair ofMulti-user channel matrix for antenna system
Figure FDA0001238984540000019
Performing singular value decomposition to determine the
Figure FDA00012389845400000110
Is diagonal matrix of
Figure FDA00012389845400000111
The method comprises the following steps:
according to
Figure FDA00012389845400000112
Determining the
Figure FDA00012389845400000113
Wherein the content of the first and second substances,
Figure FDA00012389845400000114
is a first unitary matrix of a first type,
Figure FDA00012389845400000115
is a second unitary matrix.
3. The method according to claim 2, wherein before increasing the beamforming weight of the target signal according to the signal transmission requirement of the first terminal, the method further comprises:
determining a precoding matrix of the signal to be transmitted based on a zero forcing criterion or a minimum mean square error criterion
Figure FDA00012389845400000116
Wherein the content of the first and second substances,
the zero forcing criterion is as follows:
Figure FDA00012389845400000117
the minimum mean square error criterion is:
Figure FDA00012389845400000118
wherein the content of the first and second substances,
Figure FDA00012389845400000119
is composed of
Figure FDA00012389845400000120
Conjugate transpose matrix of σ2Is the minimum mean square error of the noise.
4. A method according to any of claims 1 to 3, wherein said method is based on said
Figure FDA00012389845400000121
Determining a beamforming weight matrix for a signal to be transmitted
Figure FDA00012389845400000122
The method comprises the following steps:
determining a beamforming weight matrix according to the following formula
Figure FDA00012389845400000123
The beamforming weight in (1):
Figure FDA0001238984540000021
wherein, PTFor the total transmit power of the antenna system,
Figure FDA0001238984540000022
and
Figure FDA0001238984540000023
respectively as follows:
Figure FDA0001238984540000024
5. the method of any of claims 1-3, wherein the beam domain clipping the target signal in a transmit antenna transmitting the target signal after the power increase according to an Error Vector Magnitude (EVM) of the first terminal comprises:
determining a clipping threshold according to the EVM of the first terminal;
and according to the clipping threshold, carrying out beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal.
6. The method of claim 5, wherein the target signal is increased according to the signal transmission requirements of the first terminal
Figure FDA0001238984540000025
The beamforming weights in (1) include:
determining the number and the increasing amplitude of the first terminals needing to increase the transmitting power;
and increasing the beam forming weight of the target signal of each first terminal according to the increase amplitude.
7. The method of any one of claims 1-3, wherein said N istRedistributing noise signals generated by clipping in each transmitting antenna, comprising:
in said NtRedistributing noise signals generated by the clipping in the full space dimension of the transmitting antennas to NtA portion of the noise signal is distributed among each of the plurality of transmit antennas.
8. The method of any one of claims 1-3, wherein said N istRedistributing noise signals generated by clipping in each transmitting antenna, comprising:
in said NtRedistributing noise signals generated by the clipping in the zero-space dimension of the transmitting antennas to be in the NtThe transmitting antenna in an idle state among the transmitting antennas distributes the noise signal.
9. An apparatus for power adjustment of an antenna system, wherein the antenna system is a multiple-user multiple-input multiple-output antenna system, the apparatus comprising:
a decomposition processing unit for multi-user channel matrix to the antenna system
Figure FDA0001238984540000031
Performing singular value decomposition to determine whether the reference signal contains the above
Figure FDA0001238984540000032
Diagonal matrix of singular values
Figure FDA0001238984540000033
Wherein N istFor the number of transmitting antennas, NrIs the number of receive antennas;
a determination unit for determining the decomposition result according to the decomposition result obtained by the decomposition processing unit
Figure FDA0001238984540000034
Determining a beamforming weight matrix for a signal to be transmitted
Figure FDA0001238984540000035
Wherein, the
Figure FDA0001238984540000036
In the beam forming weight QiiAnd the above-mentioned
Figure FDA0001238984540000037
Singular value λ ofiPositive correlation;
an adjusting unit for increasing the signal determined by the determining unit of the target signal according to the signal transmission requirement of the first terminal
Figure FDA0001238984540000038
The beamforming weight in the first terminal is used for increasing the transmitting power of the target signal, and the target signal is a signal to be sent to the first terminal;
a clipping processing unit, configured to perform beam domain clipping on the target signal in a transmitting antenna that transmits the target signal whose power is increased by the adjusting unit, according to an error vector magnitude EVM of the first terminal;
a redistribution unit for redistributing at the NtNoise signals generated by clipping of the clipping processing unit are redistributed among the transmitting antennas.
10. The apparatus of claim 9,
the decomposition processing unit is specifically configured to:
according to
Figure FDA0001238984540000039
Determining the
Figure FDA00012389845400000310
Wherein the content of the first and second substances,
Figure FDA00012389845400000312
is a first unitary matrix of a first type,
Figure FDA00012389845400000311
is a second unitary matrix.
11. The apparatus of claim 10,
the determination unit is further configured to:
determining the signal to be transmitted based on a zero forcing criterion or a minimum mean square error criterionIs precoding matrix of
Figure FDA00012389845400000313
Wherein the content of the first and second substances,
the zero forcing criterion is as follows:
Figure FDA00012389845400000314
the minimum mean square error criterion is:
Figure FDA00012389845400000315
wherein the content of the first and second substances,
Figure FDA0001238984540000043
is composed of
Figure FDA0001238984540000044
Conjugate transpose matrix of σ2Is the minimum mean square error of the noise.
12. The apparatus according to any one of claims 9 to 11,
the determination unit is further configured to:
determining a beamforming weight matrix according to the following formula
Figure FDA0001238984540000045
The beamforming weight in (1):
Figure FDA0001238984540000041
wherein, PTFor the total transmit power of the antenna system,
Figure FDA0001238984540000046
and
Figure FDA0001238984540000047
respectively as follows:
Figure FDA0001238984540000042
13. the apparatus according to any one of claims 9 to 11,
the clipping processing unit is specifically configured to:
determining a clipping threshold according to the EVM of the first terminal;
and according to the clipping threshold, carrying out beam domain clipping on the target signal in a transmitting antenna for transmitting the target signal.
14. The apparatus of claim 13,
the adjusting unit is used for:
determining the number and the increasing amplitude of the first terminals needing to increase the transmitting power;
and increasing the beam forming weight of the target signal of each first terminal according to the increase amplitude.
15. The apparatus according to any one of claims 9 to 11,
said redistribution unit being specifically adapted to be at said NtRedistributing noise signals generated by the clipping in the full space dimension of the transmitting antennas to NtA portion of the noise signal is distributed among each of the plurality of transmit antennas.
16. The apparatus according to any one of claims 9 to 11,
said redistribution unit being specifically adapted to be at said NtRedistributing noise signals generated by the clipping in the zero-space dimension of the transmitting antennas to be in the NtThe transmitting antenna in an idle state among the transmitting antennas distributes the noise signal.
17. A multiple-user multiple-input multiple-output antenna system, comprising: n is a radical oftA transmitting antenna, NrA receiving antenna and a signal processing device;
the signal processing means is the antenna system power adjustment means of any of claims 9-16.
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