CN112311429A - Transmission control method, base station, and storage medium - Google Patents

Transmission control method, base station, and storage medium Download PDF

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CN112311429A
CN112311429A CN201910709046.3A CN201910709046A CN112311429A CN 112311429 A CN112311429 A CN 112311429A CN 201910709046 A CN201910709046 A CN 201910709046A CN 112311429 A CN112311429 A CN 112311429A
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matrix
data stream
target terminal
target
power
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魏浩
常丽莎
徐玉钢
黄静月
李�杰
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ZTE Corp
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ZTE Corp
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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
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Abstract

The embodiment of the invention provides a transmission control method, a base station and a storage medium, wherein a subspace data stream channel gain matrix corresponding to an equivalent channel matrix is obtained by carrying out SVD on the equivalent channel matrix of a target terminal, the target terminal is a certain terminal currently served by the base station, a target inter-stream power distribution scheme of the target terminal is determined according to the subspace data stream channel gain matrix and a preset inter-stream power distribution rule, the target inter-stream power distribution scheme comprises a target data stream number and power corresponding to each target data stream, the target data stream number is the stream number of a data stream mapped by a code word, and in some implementation processes, the determined inter-stream power distribution scheme is matched with the actual channel condition from the base station to the terminal, so that the communication quality is improved.

Description

Transmission control method, base station, and storage medium
Technical Field
The embodiments of the present invention relate to, but are not limited to, the field of communications, and in particular, but not limited to, a transmission control method, a base station, and a storage medium.
Background
The increasingly scarce spectrum resources and the continuous increase of wireless data traffic become important factors driving new innovations in wireless communication systems. In order to achieve higher spectrum efficiency, the multi-antenna technology is widely applied to wireless communication, and a base station can simultaneously serve multiple users on the same time-frequency resource, namely, the multi-user multi-antenna transmission technology.
When a base station transmits data to a terminal (i.e., a user) served by the base station, it is generally required to determine the number of data streams to be transmitted to the terminal (it should be understood that the number of data streams is the number of data streams to which the base station transmits one codeword to the terminal), and the power corresponding to each data stream. However, in the related art, the number of data streams to which one codeword transmitted by the base station is mapped and the power corresponding to each data stream are usually determined according to the number of antennas of the terminal, and in such a determination manner, the determined number of data streams and the power corresponding to each data stream may not match with the actual channel condition from the base station to the terminal, thereby resulting in poor communication quality.
Disclosure of Invention
The transmission control method, the base station and the storage medium provided by the embodiment of the invention mainly solve the technical problems that: the number of data streams to which a codeword sent by a base station to a terminal is mapped and the power corresponding to each data stream are determined based on the number of antennas of the terminal, so that the determined parameters are not matched with the actual channel condition, and the communication quality is poor.
To solve the foregoing technical problem, an embodiment of the present invention provides a transmission control method, including:
performing Singular Value Decomposition (SVD) on an equivalent channel matrix of a target terminal to obtain a subspace data stream channel gain matrix corresponding to the equivalent channel matrix, wherein the target terminal is a certain terminal currently served by a base station;
and determining a target inter-stream power distribution scheme of the target terminal according to the subspace data stream channel gain matrix and a preset inter-stream power distribution rule, wherein the target inter-stream power distribution scheme comprises a target data stream number and power corresponding to each target data stream, and the target data stream number is the stream number of a data stream mapped by one code word.
An embodiment of the present invention further provides a base station, including: a processor and a memory;
the processor is configured to execute one or more computer programs stored in the memory to implement the steps of the transmission control method described above.
Embodiments of the present invention also provide a storage medium, where one or more computer programs are stored, and the one or more computer programs may be executed by one or more processors to implement the steps of the transmission control method described above.
The invention has the beneficial effects that:
according to the transmission control method, apparatus and computer storage medium provided by the embodiments of the present invention, a singular value decomposition SVD is performed on an equivalent channel matrix of a target terminal to obtain a subspace data stream channel gain matrix corresponding to the equivalent channel matrix, the target terminal is a certain terminal currently served by a base station, a target inter-stream power allocation scheme of the target terminal is determined according to the subspace data stream channel gain matrix and a preset inter-stream power allocation rule, the target inter-stream power allocation scheme includes a target data stream number and power corresponding to each target data stream, the target data stream number is a stream number of a data stream mapped by one codeword, in some implementation processes, since the determined inter-stream power allocation scheme is determined based on the equivalent channel matrix of the target terminal and the preset inter-stream power allocation rule, the determined inter-stream power allocation scheme can be matched with an actual channel condition between the base station and the terminal, and other preset requirements are met, and the communication quality is improved.
Additional features and corresponding advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flowchart of a transmission control method according to a first embodiment of the present invention;
fig. 2 is a flowchart of an equivalent channel matrix determination process of a target terminal according to a first embodiment of the present invention;
fig. 3 is a flowchart of a process of determining an equal interference suppression matrix of a target terminal according to a first embodiment of the present invention;
fig. 4 is a flowchart of a target data stream number determination process of a target terminal according to a first embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a relationship between the number of data streams and the total data transmission capacity according to a first embodiment of the present invention;
fig. 6 is a flowchart of a process of determining the transmission power of a target terminal according to a first embodiment of the present invention;
fig. 7 is a flowchart of a transmission control method according to a second embodiment of the present invention;
fig. 8 is a flowchart of a transmission control method according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of a base station according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
in the related art, the number of data streams to which one codeword transmitted by a base station is mapped and the power corresponding to each data stream are determined based on the number of antennas of a terminal, so that the determined parameters are not matched with the actual channel condition, and the communication quality is poor. In order to solve the above technical problem, an embodiment of the present invention provides a transmission control method, please refer to fig. 1, where fig. 1 is a flowchart of the transmission control method provided in the embodiment of the present invention, and the transmission control method includes:
s101, SVD (Singular Value Decomposition) is carried out on the equivalent channel matrix of the target terminal to obtain a subspace data stream channel gain matrix corresponding to the equivalent channel matrix.
In the embodiment of the present invention, the target terminal is a certain terminal currently served by the base station, and the number of all target terminals currently served by the base station is denoted as K, it should be understood that K is an integer greater than or equal to 0. The target terminal may be a single antenna terminal or a multi-antenna terminal. And carrying out SVD on the equivalent channel matrix of the target terminal to obtain a subspace data stream channel gain matrix of the target terminal. Wherein, the equivalent channel matrix of the kth target terminal (it should be understood that K is greater than or equal to 0 and less than or equal to K) is recorded as
Figure BDA0002153091550000041
SVD is carried out on the obtained product to obtain:
Figure BDA0002153091550000042
wherein, Vk HIs a VkConjugate transpose matrix of (V)kFor the data stream transmission matrix of the kth target terminal, ΛkA channel gain matrix for the subspace data streams for the kth target terminal,
Figure BDA0002153091550000043
wherein λk,jIs the jth singular value, which represents the j sub-channel gain after SVD decomposition of the equivalent channel matrix, and is arranged in descending order, that is
Figure BDA0002153091550000044
That is, after performing SVD on the equivalent channel matrix of the target terminal, the subspace data stream channel gain matrix and the data stream transmission matrix of the target terminal can be obtained.
In the embodiment of the present invention, before performing SVD on the equivalent channel matrix of the target terminal, the equivalent channel matrix of the target terminal needs to be determined, and the determining process may refer to fig. 2:
s201, acquiring a downlink channel coefficient matrix of the target terminal.
In the embodiment of the invention, the downlink channel coefficient matrix of the target terminal is obtained, namely the downlink channel coefficient matrix from the base station to the target terminal is obtained. Recording the coefficient matrix of the downlink channel of the kth target terminal as Hk。
In the implementation of the present invention, when the downlink channel coefficient matrix of the target terminal is obtained, the downlink channel coefficient matrix of the target terminal can be determined based on the uplink channel coefficient of the target terminal according to channel reciprocity, that is, the uplink channel coefficient of the target terminal is converted into the downlink channel coefficient matrix according to channel reciprocity. For the uplink channel coefficient of the target terminal, the base station may perform uplink channel estimation according to the pilot frequency sent by the target terminal to obtain the uplink channel coefficient.
In the embodiment of the present invention, when the downlink channel coefficient matrix of the target terminal is obtained, the downlink channel coefficient matrix of the target terminal may also be determined according to the downlink channel coefficient reported by the target terminal. That is to say, the target terminal performs downlink channel estimation according to the pilot frequency sent by the base station, and feeds back the acquired downlink channel coefficient to the base station, and the base station determines the downlink channel coefficient matrix of the target terminal based on the downlink channel coefficient reported by the target terminal.
In the embodiment of the present invention, the two manners of obtaining the downlink channel coefficient matrix may also be combined. For example, when a downlink channel coefficient matrix of a target terminal is obtained, a first downlink channel coefficient matrix of the target terminal may be determined based on an uplink channel coefficient of the target terminal according to channel reciprocity, a second downlink channel coefficient matrix of the target terminal may be determined based on a downlink channel parameter reported by the target terminal, and the first downlink channel coefficient matrix and the second downlink channel coefficient matrix are combined to obtain the downlink channel coefficient matrix of the target terminal.When the first downlink channel coefficient matrix and the second downlink channel coefficient matrix are combined, the first downlink channel coefficient matrix and the second downlink channel coefficient matrix can be longitudinally spliced to obtain the downlink channel coefficient matrix. The first downlink channel coefficient matrix of the kth target terminal is recorded as:
Figure BDA0002153091550000051
wherein N isBSFor the number of antennas configured at the base station,
Figure BDA0002153091550000052
Figure BDA0002153091550000053
the number of antennas configured on the kth target terminal; recording a second downlink channel coefficient matrix of the kth target terminal as:
Figure BDA0002153091550000054
wherein the content of the first and second substances,
Figure BDA0002153091550000055
then
Figure BDA0002153091550000056
Wherein the content of the first and second substances,
Figure BDA0002153091550000061
s202, determining an interference suppression matrix of the target terminal based on the downlink channel coefficient matrix.
In the embodiment of the present invention, after a downlink channel coefficient matrix of a target terminal is obtained, an interference suppression matrix of the target terminal is determined based on the downlink channel coefficient matrix, where the interference suppression matrix of a kth target terminal is recorded as:
Figure BDA0002153091550000066
the process of determining the interference suppression matrix of the target terminal may be as shown in fig. 3:
s301, QR decomposition (orthogonal triangular decomposition) is carried out on the downlink channel coefficient matrix to obtain an orthogonal channel matrix of the target terminal.
In the embodiment of the invention, QR decomposition is carried out on the coefficient matrix of the downlink channel of the target terminal to obtain an orthogonal matrix and an upper triangular matrix, and the obtained orthogonal matrix is the orthogonal channel matrix of the target terminal. The formula for performing QR decomposition on the downlink channel coefficient matrix of the kth target terminal is as follows:
Figure BDA0002153091550000062
wherein the content of the first and second substances,
Figure BDA0002153091550000063
is HkConjugate transpose matrix of (2), QkIs a pair of
Figure BDA0002153091550000064
An orthogonal matrix obtained by QR decomposition is an orthogonal channel matrix of the kth target terminal, RkIs a pair of
Figure BDA0002153091550000065
And performing QR decomposition to obtain an upper triangular matrix.
S302, the orthogonal channel matrixes of all target terminals currently served by the base station are combined to obtain a combined orthogonal channel matrix.
In this embodiment, when the orthogonal channel matrices of all target terminals are combined, the transverse splicing may be performed. Wherein, taking the joint channel orthogonal matrix as Q, then: q ═ Q1,…,Qk,…QK]H。
S303, carrying out matrix construction based on the joint orthogonal channel matrix and the preset noise related parameters to obtain a constructed matrix.
Wherein the preset noise related parameter is a noise variance coefficient sigma2Or loading factor delta2Wherein, the loading factor is a real number greater than 0, and the specific setting can be determined according to the actual channel condition.
When the matrix construction is carried out to obtain the construction matrix, the joint orthogonal channel matrix Q can be obtainedPerforming conjugate transpose to obtain a first splicing matrix QH(ii) a Multiplying the preset noise related parameters by the identity matrix to obtain a second splicing matrix, wherein the number of columns of the second splicing matrix is the same as that of the first splicing matrix, namely the second splicing matrix is sigma I or delta I, wherein I is the identity matrix, and the number of columns of the identity matrix is the same as that of the first splicing matrix; and then longitudinally splicing the first splicing matrix and the second splicing matrix to obtain a construction matrix, wherein if the construction matrix is marked as A, the construction matrix is obtained
Figure BDA0002153091550000071
Or
Figure BDA0002153091550000072
And S304, obtaining a joint interference suppression matrix based on the construction matrix.
In the embodiment of the invention, QR decomposition is firstly carried out on the structural matrix A, and the orthogonal matrix obtained by decomposition is longitudinally split into a first matrix and a second matrix, wherein the number of rows and columns of the first matrix is the same as that of the first spliced matrix, and the number of rows and columns of the second matrix is the same as that of the second spliced matrix, namely the number of rows and columns of the first matrix, namely
Figure BDA0002153091550000073
Wherein
Figure BDA0002153091550000074
To QR-decompose the constructed matrix a into orthogonal matrices,
Figure BDA0002153091550000075
is a first matrix having rows and columns and QHThe number of rows and columns of (a) is the same,
Figure BDA0002153091550000076
a second matrix with the same number of rows and columns as the number of rows and columns of δ I (or σ I); then, multiplying the first matrix and the second matrix after conjugate transformation, and dividing by the noise related parameter to obtain a joint interference suppression matrixG，
Figure BDA0002153091550000077
Or
Figure BDA0002153091550000078
S305, obtaining an interference suppression matrix of the target terminal according to the joint interference suppression matrix.
After obtaining the joint interference matrix suppression matrix, the joint interference matrix is expressed into a form G ═ G corresponding to each target terminal1,…,Gk,…,GK]Then to GkQR decomposition is carried out to obtain
Figure BDA0002153091550000079
Obtaining an interference suppression matrix of the kth target terminal
Figure BDA00021530915500000710
In the embodiment of the invention, the orthogonal channel matrixes of the target terminals are combined to obtain a combined orthogonal channel matrix, the matrix construction is carried out on the basis of the combined channel matrix to obtain a construction matrix, the construction matrix is subjected to QR decomposition, and the interference suppression matrix of each target terminal is obtained by calculation, so that the low-complexity terminal interference matrix zero-space solution is realized.
It is to be noted that, in the embodiment of the present invention, the interference suppression matrix of the target terminal may also be calculated in other manners.
And S203, multiplying the interference suppression matrix of the target terminal by the downlink channel coefficient matrix to obtain an equivalent channel matrix of the target terminal.
For the kth target terminal, the equivalent channel matrix is
Figure BDA0002153091550000081
S102, determining a target inter-flow power distribution scheme of the target terminal according to the subspace data flow channel gain matrix and a preset inter-flow power distribution rule.
The target inter-stream power allocation scheme includes a target data stream number and power corresponding to each target data stream, and it should be understood that the target data stream number is a stream number of a data stream mapped by one codeword.
It should be noted that the number of data streams transmitted by the base station to the target terminal should be less than or equal to the number of antennas configured on the target terminal, and therefore, in the embodiment of the present invention, from the number of data streams supported by the target terminal (hereinafter, referred to as the number of data streams to be selected, where the number of data streams to be selected is a value less than the number of antennas of the target terminal), a number of data streams is determined as the number of target data streams according to the subspace data stream channel gain matrix of the target terminal and the preset inter-stream power allocation rule, and the power of the target data streams is determined. For example, assuming that the number of antennas configured on a certain target terminal is 4, the number of data streams to be selected is 1, 2, 3, and 4, respectively.
In the embodiment of the present invention, the preset inter-stream power allocation rule includes a data transmission total capacity maximization principle, and when determining a target inter-stream power allocation scheme for a target terminal, the preset inter-stream power allocation rule includes: and determining a target inter-stream power distribution scheme for the target terminal according to the subspace data stream channel gain matrix of the target terminal and the total data transmission capacity corresponding to the target terminal, wherein the target data stream number is the data stream number with the maximum corresponding total data transmission capacity in the data stream numbers to be selected, and the power corresponding to the target data stream is determined according to the subspace data stream channel gain matrix of the target terminal and the target data stream number. For example, if the number of antennas of the target terminal is 2, the number of data streams to be selected is 1 and 2, respectively, and if the number of data streams is 1, and the total data transmission capacity of the target terminal is smaller than that of the number of data streams is 2, and the total data transmission capacity of the target terminal is the number of data streams, then 2 is used as the target number of data streams of the target terminal, and based on the target number of data streams (i.e. 2), the power corresponding to the first data stream and the power corresponding to the second data stream are calculated, respectively.
It should be noted that the total data transmission capacity of the target terminal is determined according to the number of data streams of the target terminal and the subspace data stream channel gain matrix, and the power corresponding to each data stream of the target terminal is determined according to the number of data streams of the target terminal and the subspace data stream channel gain matrix.
For the kth target terminal, the power corresponding to the jth data stream (i.e. the power on the jth sub-channel)
Figure BDA0002153091550000091
With its subspace data stream channel gain matrix and data stream number jkThe correspondence of (a) is as follows:
Figure BDA0002153091550000092
wherein λ isk,jMay be selected from ΛkAnd (4) obtaining.
For the kth target terminal, the total data transmission capacity C to it by the base stationkWith its subspace data stream channel gain matrix and data stream number jkThe correspondence of (a) is as follows:
Ck＝jk·log(1+γk,j)
wherein, γk,jFor the signal-to-noise ratio on the jth sub-channel of the kth target terminal,
Figure BDA0002153091550000093
therefore, the total data transmission capacity corresponding to the number of the data streams to be selected of the target terminal and the power corresponding to each data stream when the number of the data streams is the number of the data streams to be selected can be determined based on the formula. And then, selecting the data stream number with the maximum total data transmission capacity from the data stream numbers to be selected as a target data stream number, and determining the power corresponding to each target data stream when the data stream number is the target data stream number.
In order to determine the data stream number with the maximum total data transmission capacity from the data stream numbers to be selected of the target terminal, the total data transmission capacity corresponding to all the data stream numbers to be selected can be determined, and then the data is transmittedAnd taking the number of the data streams to be selected corresponding to the maximum value of the total output capacity as the number of the target data streams. For example, if the number of antennas of the target terminal is 3, the total data transmission capacity corresponding to the number of antennas to be selected is 1, 2, and 3, and if the total data transmission capacity of the target terminal is the maximum when the number of antennas is 3, 3 is taken as the target number of data streams and is based on the sum of the target number of data streams
Figure BDA0002153091550000101
And respectively determining the power corresponding to the first data stream, the power corresponding to the second data stream and the power corresponding to the third data stream.
Alternatively, in order to determine the number of data streams with the maximum total data transmission capacity from the number of data streams to be selected of the target terminal, as shown in fig. 4 below, the number of data streams with the maximum total data transmission capacity may be determined through an iterative process, which includes:
s401, setting the initial value of the first data stream number to be 0.
S402, calculating the first data transmission total capacity corresponding to the first data flow number.
The first total data transmission capacity can be calculated in the manner described above, and will not be described herein again.
S403, the second data stream number is the first data stream number + 1.
That is, at this time, the second data stream number is 0+1 or 1.
S404, calculating the total transmission capacity of the second data corresponding to the second data stream number.
The second total data transmission capacity can be calculated in the manner described above, and will not be described herein again.
S405, whether the total capacity of the second data transmission is larger than or equal to the total capacity of the first data transmission.
If yes, go to S407; if not, go to S406.
The second total data transmission capacity and the first total data transmission capacity may be calculated in the manner described above, and are not described herein again.
S406, determining a target inter-stream power distribution scheme of the target terminal based on the first data stream number.
That is, when the total second data transmission capacity is smaller than the total first data transmission capacity, the target inter-stream power allocation scheme of the target terminal is determined based on the first data stream number, and at this time, the target data stream number is the first data stream number.
It should be noted that, referring to the above formula, the relationship between the number of data streams and the total data transmission capacity is: as the number of data streams increases, the total capacity of data transmission tends to increase first and then decrease. For example, referring to fig. 5, it is a graph of a relationship between a total data transmission capacity and a number of data streams, wherein an abscissa represents the number of data streams and an ordinate represents the total data transmission capacity, and therefore, if the total data transmission capacity corresponding to a larger number of data streams is smaller than the total data transmission capacity corresponding to a smaller number of data streams for the first time in a process in which the number of data streams increases from 1, the total data transmission capacity corresponding to the smaller number of data streams is the maximum. Therefore, in this embodiment, since the value of the second data stream number is increased from 1 in order, and the second data stream number is equal to the first data stream number +1 (that is, the second data stream number is greater than the first data stream number), if the second total data transmission capacity corresponding to the second data stream number (larger data stream number) is smaller than the first total data transmission capacity corresponding to the first data stream number (smaller data stream number), it indicates that the first total data transmission capacity corresponding to the first data stream number (smaller data stream number) is the maximum value at this time, and therefore, the first data stream number is set as the target data stream number.
S407, judging whether the number of the second data streams is smaller than the number of the antennas of the target terminal.
If yes, go to S408, otherwise, go to S409.
S408, the first data stream number is the second data stream number; the first total data transmission capacity is equal to the second total data transmission capacity; the second data stream number is the second data stream number + 1.
Based on the relationship between the number of data streams and the total data transmission capacity, since at this time, the total second data transmission capacity corresponding to the number of second data streams (larger number of data streams) is greater than the total first data transmission capacity corresponding to the number of first data streams (smaller number of data streams), and the number of second data streams is smaller than the number of antennas of the target terminal, it indicates that the maximum value of the total data transmission capacity corresponding to each number of data streams supported by the terminal has not been found at this time, therefore, the value of the number of first data streams is increased, the value of the number of first data streams is set as the value of the number of second data streams, the value of the total first data transmission capacity is set as the value of the total second data transmission capacity, the value of the number of second data streams is increased by 1, and S404 is performed for the next round of cycles, that is, the value of the number of first data streams in the new round of cycles is the value of the total first data transmission capacity in the previous round of the second data transmission capacity, and the value of the second data stream number in the new round is equal to the value of the second data stream number in the previous round + 1.
For example, assume that in the first loop, the first data stream number is 0 and the second data stream number is 1; then in the next cycle the first data stream number is 1 and the second data stream number is 2.
And S409, determining a target inter-flow power distribution scheme of the target terminal based on the second data flow number.
It should be understood that the values of the second data stream number are sequentially incremented from 1, and therefore, if the determination result in S407 is no (that is, the second data stream number is not less than the number of antennas of the target terminal), it indicates that the second data stream number is equal to the number of antennas of the target terminal at this time. Since the number of the second data streams is already the maximum number of data streams supported by the target terminal (i.e. the number of antennas of the target terminal), and the total second data transmission capacity corresponding to the number of the second data streams is greater than or equal to the total first data transmission capacity corresponding to the number of the first data streams, it indicates that the total second data transmission capacity is the maximum value of the corresponding total data transmission capacity in each number of data streams supported by the target terminal. Therefore, the inter-stream power allocation scheme of the target terminal is determined based on the second data stream number, that is, at this time, the target data stream number is the second data stream number.
In the embodiment of the present invention, the preset inter-stream power allocation rule includes a total throughput maximization principle, and when a target inter-stream power allocation scheme of a target terminal is determined, the target inter-stream power allocation scheme of the target terminal is determined according to a subspace data stream channel gain matrix of the target terminal and a total throughput corresponding to the target terminal, where the target data stream number is a data stream number with the largest total throughput corresponding to each data stream number to be selected, and the power corresponding to the target data stream is determined according to the subspace data stream channel gain matrix of the target terminal and the target data stream number.
It should be noted that the total throughput of the target terminal is determined according to the number of data streams of the target terminal and the subspace data stream channel gain matrix, and the power corresponding to each data stream of the target terminal is determined according to the number of data streams of the target terminal and the subspace data stream channel gain matrix.
For the kth target terminal, its total throughput TkAnd the number j of data streamskThe corresponding relationship with the subspace data stream channel gain matrix is as follows:
Figure BDA0002153091550000121
wherein r isk,jNormalized transmission code rate epsilon corresponding to Modulation and Coding Scheme (MCS) grade selected for jth sub-channel of kth target terminalk,jAnd the Block Error Rate (BLER, Block Error Rate) corresponding to the MCS level selected for the jth sub-channel of the kth target terminal. r isk,jAnd εk,jBy gammak,jIt is decided that the normalized code rate and BLER are the same for all subchannels.
The manner of determining the number of data streams with the maximum total throughput from the number of data streams to be selected of the target terminal may be referred to as the manner of determining the number of data streams with the maximum total data transmission capacity from the number of data streams to be selected of the target terminal, and is not described herein again.
In the embodiment of the invention, the power distribution matrix among target streams of the kth target terminal is recorded as
Figure BDA0002153091550000131
Wherein, J hereinkIs the target data stream number，ΣkThe main diagonal element of
Figure BDA0002153091550000132
The other elements are the elements of 0 and,
Figure BDA0002153091550000133
is the power of the jth target subchannel (i.e., the target data stream). When distributing power, it is necessary to make the equivalent gain, i.e. the signal-to-noise ratio, of each target sub-channel equal, i.e. to distribute power
Figure BDA0002153091550000134
Wherein the equivalent channel gain, i.e., signal-to-noise ratio, of the jth target subchannel is
Figure BDA0002153091550000135
In the embodiment of the present invention, after determining the target inter-stream power allocation scheme of the target terminal, a precoding matrix corresponding to the target terminal may also be determined based on the interference suppression matrix of the target terminal, the data stream transmission matrix, the target inter-stream power allocation scheme, and the transmission power allocated to the target terminal. Wherein, the precoding of the kth target terminal is recorded as Wk，
Figure BDA0002153091550000136
Where ρ iskAnd allocating the factor for the power of the kth target terminal. Merging precoding matrixes of all target terminals, wherein W is [ W1,…,Wk,…,WK]Taking into account the base station side power constraint normalization factor
Figure BDA0002153091550000137
Precoding matrix of downlink transmission of base station
Figure BDA0002153091550000138
Thus, the base station can be based on
Figure BDA0002153091550000139
To the data sent to each target terminalAnd (5) encoding.
Because the power allocation factor of the target terminal needs to be determined when the precoding matrix of the target terminal is determined, the transmission power allocated to the target terminal can be determined according to the total transmission power of the base station and a preset terminal power allocation rule before the precoding matrix of the target terminal is determined.
Wherein, the preset terminal power distribution rule includes that the transmission power of each terminal is equal, and then the total transmission power of the base station is averagely distributed to all target terminals currently served by the base station, namely
Figure BDA0002153091550000141
Wherein, PkFor the transmission power allocated to the kth target terminal, PBSK is the total transmit power of the base station, and K is the number of all target terminals currently served by the base station. Due to the fact that
Figure BDA0002153091550000142
Therefore, the temperature of the molten metal is controlled,
Figure BDA0002153091550000143
wherein the content of the first and second substances,
Figure BDA0002153091550000144
or, if the preset terminal power allocation rule includes that the transmission powers of the data streams are equal, as shown in fig. 6, the determining manner of the transmission power of the target terminal includes:
s601, determining the total data stream number according to the target inter-stream power distribution rule of the target terminal.
And the total data stream number is the sum of the target data stream numbers of all the target terminals.
And S602, determining the average power of the data stream according to the total transmitting power and the total data stream number of the base station.
The average power of the data stream is the total transmission power/total number of data streams of the base station.
S603, determining the transmitting power distributed to the target terminal according to the data stream average power and the target data stream number of the target terminal.
That is to say that the position of the first electrode,
Figure BDA0002153091550000145
then
Figure BDA0002153091550000146
The transmission control method provided by the embodiment of the invention obtains a subspace data stream channel gain matrix corresponding to an equivalent channel matrix by performing Singular Value Decomposition (SVD) on the equivalent channel matrix of a target terminal, the target terminal is a certain terminal currently served by a base station, a target inter-stream power distribution scheme of the target terminal is determined according to the subspace data stream channel gain matrix and a preset inter-stream power distribution rule, the target inter-stream power distribution scheme comprises a target data stream number and power corresponding to each target data stream, the target data stream number is the stream number of a data stream mapped by a code word, the determined inter-stream power distribution scheme can be matched with the actual channel condition from the base station to the terminal, so as to improve the communication quality, and the inter-stream power distribution scheme of the target terminal is determined based on the preset inter-stream power distribution rule, so that the determined inter-stream power distribution scheme can meet other preset requirements, further improving the communication quality.
Example two:
for a better understanding of the present invention, the present embodiment is described with reference to more specific examples. Referring to fig. 7, fig. 7 is a flowchart of a transmission control method according to an embodiment of the present invention, including:
s701, acquiring a downlink channel coefficient matrix of the target terminal.
In the embodiment of the present invention, the kth terminal is taken as an example for description, it should be understood that, for the calculation manner of other target terminals, please refer to the kth target terminal, it should be understood that K is greater than 0 and less than or equal to K, and K is the number of target terminals currently served by the base station.
The base station determines a first downlink channel coefficient matrix based on the uplink channel coefficient of the kth target terminal according to the channel reciprocity
Figure BDA0002153091550000151
Determining a second downlink channel coefficient matrix based on the downlink channel parameters reported by the kth target terminal
Figure BDA0002153091550000152
Longitudinally splicing the first downlink channel coefficient matrix and the second downlink channel coefficient matrix to obtain a downlink channel coefficient matrix
Figure BDA0002153091550000153
Wherein the content of the first and second substances,
Figure BDA0002153091550000154
Figure BDA0002153091550000155
and k is the number of antennas configured on the kth target terminal, and k is the identifier of the target terminal.
S702, carrying out orthogonal QR decomposition on the downlink channel coefficient matrix of the target terminal to obtain an orthogonal channel matrix of the target terminal.
The formula for the base station to perform QR decomposition on the downlink channel coefficient matrix of the kth target terminal is as follows:
Figure BDA0002153091550000161
wherein the content of the first and second substances,
Figure BDA0002153091550000162
is HkConjugate transpose matrix of (2), QkIs a pair of
Figure BDA0002153091550000163
Orthogonal matrix, Q, obtained by QR decompositionkIs the orthogonal channel matrix, R, of the kth target terminalkIs a pair of
Figure BDA0002153091550000164
And performing QR decomposition to obtain an upper triangular matrix.
S703, the orthogonal channel matrixes of all target terminals currently served by the base station are transversely spliced to obtain a combined orthogonal channel matrix.
The joint channel quadrature matrix is denoted as Q, Q ═ Q1,…,Qk,…QK]H。
And S704, carrying out matrix construction based on the joint orthogonal channel matrix and the noise variance coefficient to obtain a construction matrix.
Construction matrix
Figure BDA0002153091550000165
Wherein Q isHConjugate transpose matrix, σ, for joint quadrature channel matrix Q2Is the noise variance coefficient, I is the number of columns and QHIdentity matrix with same number of columns.
S705, obtaining a joint interference suppression matrix based on the construction matrix.
The construction matrix a is subjected to QR decomposition,
Figure BDA0002153091550000166
Figure BDA0002153091550000167
for the orthogonal matrix obtained by QR decomposition of the construction matrix A, the construction matrix A is subjected to the following steps
Figure BDA0002153091550000168
Is longitudinally split into
Figure BDA0002153091550000169
And
Figure BDA00021530915500001610
wherein the content of the first and second substances,
Figure BDA00021530915500001611
the number of rows and columns of (a) and Q, respectivelyHThe number of rows and columns of (a) is the same,
Figure BDA00021530915500001612
the number of rows and columns of (a) is the same as the number of rows and columns of (a), respectively. In conjunction with the interference matrix G,
Figure BDA00021530915500001613
and S706, obtaining an interference suppression matrix of the target terminal according to the joint interference suppression matrix.
Representing the joint interference matrix as a form G ═ G corresponding to each target terminal1,…,Gk,…,GK]Then to GkQR decomposition is carried out to obtain
Figure BDA00021530915500001614
Obtaining an interference suppression matrix of the kth target terminal
Figure BDA00021530915500001615
And S707, multiplying the interference suppression matrix of the target terminal by the downlink channel coefficient matrix to obtain an equivalent channel matrix of the target terminal.
Wherein, the equivalent channel matrix of the kth target terminal is:
Figure BDA0002153091550000171
s708, performing SVD on the equivalent channel matrix of the target terminal to obtain a subspace data stream channel gain matrix and a data stream transmission matrix.
Carrying out SVD on the equivalent channel matrix of the kth terminal:
Figure BDA0002153091550000172
wherein, Vk HIs a VkConjugate transpose matrix of (V)kFor the data stream transmission matrix of the kth target terminal, ΛkA channel gain matrix for the subspace data streams for the kth target terminal,
Figure BDA0002153091550000173
wherein λk,jIs the jth singular value, which represents the j-th subchannel gain after the SVD decomposition of the equivalent channel matrix.
And S709, selecting the data stream number with the maximum data transmission total capacity from the data stream numbers to be selected as the target data stream number according to the subspace data stream channel gain matrix of the target terminal.
And the number of the data streams to be selected is a value smaller than the number of the target terminal antennas.
In the embodiment of the invention, the data stream number with the maximum total data transmission capacity is selected from the data stream numbers to be selected as the target data stream number. Wherein the target data stream number J of the kth target terminal is determined by the following iterative procedurek：
1. Setting the initial value of A to be 0;
2. according to the formula
Figure BDA0002153091550000174
And formula Ck＝jk·log(1+γk,j) Calculating the kth target terminal, at jkTotal data transmission capacity C associated with ak(A)；
3. B is a + 1; that is, B is always 1 greater than A;
4. according to the formula
Figure BDA0002153091550000181
And formula Ck＝jk·log(1+γk,j) Calculating the kth target terminal, at jkTotal data transmission capacity C associated with Bk(B)：
5. Judgment Ck(B) Whether or not it is greater than or equal to Ck(A) If yes, turning to 6, and if not, turning to 7;
6. judging whether B is less than
Figure BDA0002153091550000182
If it is not
Figure BDA0002153091550000183
Setting A as B, Ck(A)＝Ck(B) B +1, and 4 is cycled; wherein the content of the first and second substances,
Figure BDA0002153091550000184
for the k-th target terminalThe number of antennas of (a);
if B is not less than
Figure BDA0002153091550000185
Then at this point in time,
Figure BDA0002153091550000186
then output JkB, ending, that is, at this time, the number of target data streams is B;
7. output JkAnd ending the process, namely, the target data flow number is equal to A.
And S710, determining a target inter-stream power distribution scheme of the target terminal according to the number of the target data streams.
The target inter-stream power distribution scheme comprises the target data stream number of the target terminal and the power corresponding to each target data stream. For the k target terminal, according to the formula
Figure BDA0002153091550000187
Is determined at jkIs JkThe power corresponding to the j-th entry index data stream
Figure BDA0002153091550000188
The target inter-stream power distribution matrix of the kth target terminal is recorded as
Figure BDA0002153091550000189
Wherein, J hereinkFor the target data stream number, sigmakThe main diagonal element of
Figure BDA00021530915500001810
The other elements are 0.
S711 determines the transmission power allocated to the target terminal according to the rule that the total transmission power of the base station and the transmission power of each terminal are equal.
For the kth target terminal, the transmission power allocated to it
Figure BDA0002153091550000191
Wherein, PBSIs the total transmit power of the base station.
S712, determining a precoding matrix corresponding to the target terminal based on the interference suppression matrix of the target terminal, the data stream transmission matrix, the target inter-stream power distribution scheme and the transmission power distributed to the target terminal.
For the kth target terminal, it is precoded as
Figure BDA0002153091550000192
Where ρ iskA factor is assigned to the power of the kth target terminal,
Figure BDA0002153091550000193
during subsequent communication, the base station may be based on WkAnd coding the data transmitted to the kth target terminal.
Merging precoding matrixes of all target terminals, wherein W is [ W1,…,Wk,…,WK]Taking into account the base station side power constraint normalization factor
Figure BDA0002153091550000194
Precoding matrix of downlink transmission of base station
Figure BDA0002153091550000195
Thus, the base station can be based on
Figure BDA0002153091550000196
And encoding the data transmitted to each target terminal.
The transmission control method provided by the embodiment of the invention obtains a subspace data stream channel gain matrix corresponding to an equivalent channel matrix by performing SVD on the equivalent channel matrix of a target terminal, the target terminal is a certain terminal currently served by a base station, a target inter-stream power distribution scheme of the target terminal is determined according to the subspace data stream channel gain matrix and a preset data transmission total capacity maximization principle, the target inter-stream power distribution scheme comprises a target data stream number and power corresponding to each target data stream, the target data stream number is the stream number of a data stream mapped by a code word, and in some implementation processes, because the inter-stream power distribution scheme is determined based on the equivalent channel matrix of the target terminal, the determined inter-stream power distribution scheme can be matched with the actual channel condition from the base station to the terminal, thereby improving the communication quality, and, the inter-stream power allocation scheme of the target terminal is determined based on the data transmission total capacity maximization principle, so that the data transmission total capacity corresponding to the determined inter-stream power allocation scheme can be maximized.
Example three:
for a better understanding of the present invention, the present embodiment is described with reference to more specific examples. Referring to fig. 8, fig. 8 is a flowchart of a transmission control method according to an embodiment of the present invention, including:
and S801, acquiring a downlink channel coefficient matrix of the target terminal.
In the embodiment of the present invention, the kth terminal is taken as an example for description, it should be understood that, for the calculation manner of other target terminals, please refer to the kth target terminal, it should be understood that K is greater than 0 and less than or equal to K, and K is the number of target terminals currently served by the base station.
The base station determines a first downlink channel coefficient matrix based on the uplink channel coefficient of the kth target terminal according to the channel reciprocity
Figure BDA0002153091550000201
Determining a second downlink channel coefficient matrix based on the downlink channel parameters reported by the kth target terminal
Figure BDA0002153091550000202
Longitudinally splicing the first downlink channel coefficient matrix and the second downlink channel coefficient matrix to obtain a downlink channel coefficient matrix
Figure BDA0002153091550000203
Wherein the content of the first and second substances,
Figure BDA0002153091550000204
Figure BDA0002153091550000205
and k is the number of antennas configured on the kth target terminal, and k is the identifier of the target terminal.
S802, carrying out orthogonal QR decomposition on the downlink channel coefficient matrix of the target terminal to obtain an orthogonal channel matrix of the target terminal.
The formula for performing QR decomposition on the downlink channel coefficient matrix of the kth target terminal is as follows:
Figure BDA0002153091550000206
wherein the content of the first and second substances,
Figure BDA0002153091550000207
is HkConjugate transpose matrix of (2), QkIs a pair of
Figure BDA0002153091550000208
Orthogonal matrix, Q, obtained by QR decompositionkIs the orthogonal channel matrix, R, of the kth target terminalkIs a pair of
Figure BDA0002153091550000209
And performing QR decomposition to obtain an upper triangular matrix.
S803, the orthogonal channel matrixes of all target terminals currently served by the base station are transversely spliced to obtain a combined orthogonal channel matrix
The joint channel quadrature matrix is denoted as Q, Q ═ Q1,…,Qk,…QK]H。
And S804, carrying out matrix construction based on the joint orthogonal channel matrix and the loading factor to obtain a construction matrix.
Construction matrix
Figure BDA0002153091550000211
Wherein Q isHA conjugate transpose matrix, δ, for the joint orthogonal channel matrix Q2For the loading factor, I is the number of columns and QHIdentity matrix with same number of columns.
And S805, obtaining a joint interference suppression matrix based on the construction matrix.
The construction matrix a is subjected to QR decomposition,
Figure BDA0002153091550000212
Figure BDA0002153091550000213
for the orthogonal matrix obtained by QR decomposition of the construction matrix A, the construction matrix A is subjected to the following steps
Figure BDA0002153091550000214
Is longitudinally split into
Figure BDA0002153091550000215
And
Figure BDA0002153091550000216
wherein the content of the first and second substances,
Figure BDA0002153091550000217
the number of rows and columns of (a) and Q, respectivelyHThe number of rows and columns of (a) is the same,
Figure BDA0002153091550000218
the number of rows and columns of (d) is the same as the number of rows and columns of (d), respectively. In conjunction with the interference matrix G,
Figure BDA0002153091550000219
and S806, obtaining an interference suppression matrix of the target terminal according to the joint interference suppression matrix.
Representing the joint interference matrix as a form G ═ G corresponding to each target terminal1,…,Gk,…,GK]Then to GkThe QR decomposition is carried out on the obtained product,
Figure BDA00021530915500002110
obtaining an interference suppression matrix of the kth target terminal
Figure BDA00021530915500002111
And S807, multiplying the interference suppression matrix of the target terminal by the downlink channel coefficient matrix to obtain an equivalent channel matrix of the target terminal.
Wherein, the equivalent channel matrix of the kth target terminal is:
Figure BDA00021530915500002112
s808, performing SVD on the equivalent channel matrix of the target terminal to obtain a subspace data stream channel gain matrix and a data stream transmission matrix.
Carrying out SVD on the equivalent channel matrix of the kth terminal:
Figure BDA00021530915500002113
wherein, Vk HIs a VkConjugate transpose matrix of (V)kFor the data stream transmission matrix of the kth target terminal, ΛkA channel gain matrix for the subspace data streams for the kth target terminal,
Figure BDA0002153091550000221
wherein λk,jIs the jth singular value, which represents the j-th subchannel gain after the SVD decomposition of the equivalent channel matrix.
And S809, selecting the corresponding data stream number with the maximum total throughput from the data stream numbers to be selected as the target data stream number according to the subspace data stream channel gain matrix of the target terminal.
And the number of the data streams to be selected is a value smaller than the number of the target terminal antennas.
In the embodiment of the invention, the data stream number with the maximum data transmission throughput is selected from the data stream numbers to be selected as the target data stream number. Wherein the target data stream number J of the kth target terminal is determined by the following iterative procedurek：
(1) Setting the initial value of a to be 0;
(2) according to the formula
Figure BDA0002153091550000222
And formula
Figure BDA0002153091550000223
ComputingKth target terminal, jkTotal throughput T corresponding to ak(a)；
Wherein r isk,jNormalized transmission code rate, epsilon, corresponding to MCS level selected for jth sub-channel of kth target terminalk,jAnd BLER corresponding to the MCS level selected for the jth sub-channel of the kth target terminal. r isk,jAnd εk,jBy gammak,jDetermining that the normalized code rate and the BLER of all the sub-channels are the same;
(3)b＝a+1；
(4) according to the formula
Figure BDA0002153091550000224
And formula
Figure BDA0002153091550000225
Calculating the kth target terminal, jkTotal throughput T corresponding to bk(b)；
(5) Judgment of Tk(b) Whether or not T is greater than or equal tok(a) If yes, turning to (6), if not, turning to (7);
(6) judging whether b is less than
Figure BDA0002153091550000231
If it is not
Figure BDA0002153091550000232
Setting a as b, Tk(a)＝Tk(b) B +1, and turn (4) to cycle, wherein,
Figure BDA0002153091550000233
the number of antennas on the kth target terminal;
if b is not less than
Figure BDA0002153091550000234
Then at this point in time,
Figure BDA0002153091550000235
then output JkB, finish, i.e. this time, the objectB is the number of data streams;
(7) output JkAnd a, ending, namely, the target data flow number is a at this moment.
And S810, determining a target inter-flow power distribution scheme of the target terminal according to the target data flow number.
The target inter-stream power distribution scheme comprises the target data stream number of the target terminal and the power corresponding to each target data stream. For the k target terminal, according to the formula
Figure BDA0002153091550000236
Is determined at jkIs JkThe power corresponding to the j-th entry index data stream
Figure BDA0002153091550000237
The target inter-stream power distribution matrix of the kth target terminal is recorded as
Figure BDA0002153091550000238
Wherein, J hereinkFor the target data stream number, sigmakThe main diagonal element of
Figure BDA0002153091550000239
The other elements are 0.
S811, determines the transmission power allocated to the target terminal according to the rule that the total transmission power of the base station and the transmission power of each data stream are equal.
The total data stream number is determined based on the power distribution rule among the target streams of all the target terminals, wherein the total data stream number is as follows:
Figure BDA00021530915500002310
determining the average power of the data stream according to the total transmitting power and the total data stream number of the base station, wherein,
Figure BDA0002153091550000241
PBSis the total transmit power of the base station.
Averaging power and target terminal according to data streamThe number of target data streams determines the transmission power allocated to the target terminal, and for the kth target terminal, the transmission power allocated to it
Figure BDA0002153091550000242
S812, determining a precoding matrix of the target terminal based on the interference suppression matrix of the target terminal, the data stream transmission matrix, the target inter-stream power distribution scheme and the transmission power distributed to the target terminal.
For the kth target terminal, it is precoded as
Figure BDA0002153091550000243
Where ρ iskA factor is assigned to the power of the kth target terminal,
Figure BDA0002153091550000244
during subsequent communication, the base station may be based on WkAnd coding the data transmitted to the kth target terminal.
Merging precoding matrixes of all target terminals, wherein W is [ W1,…,Wk,…,WK]Taking into account the base station side power constraint normalization factor
Figure BDA0002153091550000245
Precoding matrix of downlink transmission of base station
Figure BDA0002153091550000246
Thus, the base station can be based on
Figure BDA0002153091550000247
And encoding the data transmitted to each target terminal.
The transmission control method provided by the embodiment of the invention obtains a subspace data stream channel gain matrix corresponding to an equivalent channel matrix by performing Singular Value Decomposition (SVD) on the equivalent channel matrix of a target terminal, the target terminal is a certain terminal currently served by a base station, a target inter-stream power distribution scheme of the target terminal is determined according to the subspace data stream channel gain matrix and a preset total throughput maximization principle, the target inter-stream power distribution scheme comprises a target data stream number and power corresponding to each target data stream, the target data stream number is the stream number of a data stream mapped by a code word, and in some implementation processes, because the inter-stream power distribution scheme is determined based on the equivalent channel matrix of the target terminal, the determined inter-stream power distribution scheme can be matched with the actual channel condition between the base station and the terminal, so as to improve the communication quality, and, the inter-flow power allocation scheme of the target terminal is determined based on the total throughput maximization principle, so that the corresponding total throughput can be maximized when the base station transmits data to the terminal based on the determined inter-flow power allocation scheme.
Example four:
an embodiment of the present invention further provides a base station, please refer to fig. 9, including: a processor 901 and a memory 902; the processor 901 is configured to execute one or more computer programs stored in the memory 902 to implement at least one step of the transmission control method according to the first embodiment, the second embodiment, and the third embodiment. It should be understood that the processor 901 is coupled to the memory 902.
Embodiments of the present invention also provide a storage medium including volatile or nonvolatile, removable or non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, computer program modules or other data. Computer-readable storage media include, but are not limited to, RAM (Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash Memory or other Memory technology, CD-ROM (Compact disk Read-Only Memory), Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer.
The storage medium stores one or more computer programs that are executable by one or more processors to implement at least one step of the transmission control method as described in embodiment one, embodiment two, and embodiment three.
The base station and the storage medium provided by the embodiment of the invention obtain the subspace data stream channel gain matrix corresponding to the equivalent channel matrix by performing Singular Value Decomposition (SVD) on the equivalent channel matrix of the target terminal, the target terminal is a certain terminal currently served by the base station, the target inter-stream power distribution scheme of the target terminal is determined according to the subspace data stream channel gain matrix and the preset inter-stream power distribution rule, the target inter-stream power distribution scheme comprises the target data stream number and the power corresponding to each target data stream, the target data stream number is the stream number of the data stream mapped by one code word, and in some implementation processes, the determined inter-stream power distribution scheme can be matched with the actual channel condition between the base station and the terminal so as to improve the communication quality, and the inter-flow power distribution scheme of the target terminal is determined based on the preset inter-flow power distribution rule, so that the determined inter-flow power distribution scheme can meet other preset requirements, and the communication quality is further improved.
It will be apparent to those skilled in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software (which may be implemented in computer program code executable by a computing device), firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit.
In addition, communication media typically embodies computer readable instructions, data structures, computer program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to one of ordinary skill in the art. Thus, the present invention is not limited to any specific combination of hardware and software.
The foregoing is a more detailed description of embodiments of the present invention, and the present invention is not to be considered limited to such descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (15)

1. A transmission control method, comprising:
performing Singular Value Decomposition (SVD) on an equivalent channel matrix of a target terminal to obtain a subspace data stream channel gain matrix corresponding to the equivalent channel matrix, wherein the target terminal is a certain terminal currently served by a base station;
and determining a target inter-stream power distribution scheme of the target terminal according to the subspace data stream channel gain matrix and a preset inter-stream power distribution rule, wherein the target inter-stream power distribution scheme comprises a target data stream number and power corresponding to each target data stream, and the target data stream number is the stream number of a data stream mapped by one code word.
2. The transmission control method according to claim 1, wherein before performing SVD on the equivalent channel matrix of the target terminal, the method further comprises:
acquiring a downlink channel coefficient matrix of the target terminal;
determining an interference suppression matrix of the target terminal based on the downlink channel coefficient matrix;
and multiplying the interference suppression matrix of the target terminal by the downlink channel coefficient matrix to obtain the equivalent channel matrix of the target terminal.
3. The transmission control method of claim 2, wherein the determining the interference suppression matrix for the target terminal based on the downlink channel coefficient matrix comprises:
carrying out orthogonal QR decomposition on the downlink channel coefficient matrix to obtain an orthogonal channel matrix of the target terminal;
combining orthogonal channel matrixes of all target terminals currently served by the base station to obtain a combined orthogonal channel matrix;
performing matrix construction based on the combined orthogonal channel matrix and a preset noise related parameter to obtain a construction matrix, wherein the preset noise related parameter is a noise variance coefficient or a loading factor;
obtaining a joint interference suppression matrix based on the construction matrix;
and obtaining an interference suppression matrix of the target terminal according to the combined interference suppression matrix.
4. The transmission control method of claim 3, wherein performing matrix construction based on the joint orthogonal channel matrix and a preset noise-related parameter to obtain a construction matrix comprises:
performing conjugate transpose on the combined orthogonal channel matrix to obtain a first splicing matrix;
multiplying the preset noise related parameters by an identity matrix to obtain a second splicing matrix, wherein the number of columns of the second splicing matrix is the same as that of the first splicing matrix;
and longitudinally splicing the first splicing matrix and the second splicing matrix to obtain the construction matrix.
5. The transmission control method of claim 4, wherein the deriving a joint interference suppression matrix based on the construction matrix comprises:
performing QR decomposition on the constructed matrix, and longitudinally splitting the orthogonal matrix obtained by decomposition into a first matrix and a second matrix, wherein the number of rows and columns of the first matrix is the same as that of the first spliced matrix, and the number of rows and columns of the second matrix is the same as that of the second spliced matrix;
and multiplying the first matrix and the second matrix subjected to conjugate transformation, and dividing by the noise related parameter to obtain a joint interference suppression matrix.
6. The transmission control method according to claim 2, wherein the obtaining the downlink channel coefficient matrix of the target terminal includes:
determining a first downlink channel coefficient of the target terminal based on an uplink channel coefficient of the target terminal according to channel reciprocity;
determining a second downlink channel coefficient of the target terminal based on the downlink channel parameter reported by the target terminal;
and combining the first downlink channel coefficient and the second downlink channel coefficient to obtain a downlink channel coefficient matrix of the target terminal.
7. The transmission control method of claim 1, wherein after determining the target inter-stream power allocation scheme for the target terminal, further comprising:
determining a precoding matrix of the target terminal based on the interference suppression matrix of the target terminal, a data stream transmission matrix, the target inter-stream power allocation scheme, and the transmission power allocated to the target terminal.
8. The transmission control method of claim 7, wherein before determining the precoding matrix for the target terminal, further comprising:
and determining the transmission power distributed to the target terminal according to the total transmission power of the base station and a preset terminal power distribution rule.
9. The transmission control method according to claim 8, wherein the terminal power allocation rule includes that the transmission power of each terminal is equal;
the determining the transmission power allocated to the target terminal according to the total transmission power of the base station and a preset terminal power allocation rule includes:
and averagely distributing the total transmission power of the base station to all the target terminals currently served by the base station.
10. The transmission control method according to claim 8, wherein the terminal allocation rule includes that the transmission power of each data stream is equal;
the determining the transmission power allocated to the target terminal according to the total transmission power of the base station and a preset terminal power allocation rule includes:
determining the total data stream number according to the target inter-stream power distribution rule of the target terminal, wherein the total data stream number is the sum of the target data stream numbers of all the target terminals;
determining the average power of the data stream according to the total sending power of the base station and the total data stream number;
and determining the transmitting power distributed to the target terminal according to the average power of the data streams and the target data stream number of the target terminal.
11. The transmission control method of claim 7, wherein the performing SVD on the equivalent channel matrix of the target terminal to obtain the channel gain matrix of the subspace data stream corresponding to the equivalent channel matrix comprises:
and performing SVD on the equivalent channel matrix of the target terminal to obtain a subspace data stream channel gain matrix and the data stream transmission matrix corresponding to the equivalent channel matrix.
12. The transmission control method according to any of claims 1-11, wherein the predetermined inter-stream power allocation rule is a data transmission total capacity maximization principle;
the determining a target inter-stream power allocation scheme of the target terminal according to the subspace data stream channel gain matrix and a preset inter-stream power allocation rule includes:
determining a target inter-stream power distribution scheme of the target terminal according to the subspace data stream channel gain matrix of the target terminal and the total data transmission capacity corresponding to the target terminal, wherein the target data stream number is the data stream number with the maximum corresponding total data transmission capacity in the data stream numbers to be selected, the data stream numbers to be selected are the data stream numbers supported by the target terminal, the total data transmission capacity corresponding to the data stream numbers to be selected is determined according to the data stream numbers to be selected and the subspace data stream channel gain matrix, and the power corresponding to the target data stream is determined according to the subspace data stream channel gain matrix and the target data stream number.
13. The transmission control method according to any of claims 1-11, wherein the predetermined inter-flow power allocation rule is a total throughput maximization principle;
the determining a target inter-stream power allocation scheme of the target terminal according to the subspace data stream channel gain matrix and a preset inter-stream power allocation rule includes:
determining a target inter-stream power allocation scheme of the target terminal according to the subspace data stream channel gain matrix of the target terminal and a total throughput corresponding to the target terminal, where the target data stream number is a data stream number with the maximum corresponding total throughput among the data streams to be selected, the data streams to be selected are data streams supported by the target terminal, the total throughput corresponding to the data streams to be selected is determined according to the data streams to be selected and the subspace data stream channel gain matrix, and the power corresponding to the target data stream is determined according to the subspace data stream channel gain matrix and the target data stream number.
14. A base station, comprising: a processor and a memory;
the processor is configured to execute one or more computer programs stored in the memory to implement the steps of the transmission control method according to any one of claims 1 to 13.
15. A storage medium, characterized in that the storage medium stores one or more computer programs executable by one or more processors to implement the steps of the transmission control method according to any one of claims 1 to 13.
CN201910709046.3A 2019-08-01 2019-08-01 Transmission control method, base station, and storage medium Pending CN112311429A (en)

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