CN109412660A - Extensive antenna transmission method, base station, user terminal and extensive antenna system - Google Patents
Extensive antenna transmission method, base station, user terminal and extensive antenna system Download PDFInfo
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- CN109412660A CN109412660A CN201710694152.XA CN201710694152A CN109412660A CN 109412660 A CN109412660 A CN 109412660A CN 201710694152 A CN201710694152 A CN 201710694152A CN 109412660 A CN109412660 A CN 109412660A
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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
- H04B7/0452—Multi-user MIMO systems
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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
- H04B7/0456—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
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/068—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using space frequency diversity
-
- 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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention discloses a kind of extensive antenna transmission method, base station, user terminal and extensive antenna system.This method comprises: the user of base station coverage area is divided near region broadcasting user group, far field broadcasting user group, near region unicast user group and far field unicast user group by base station；Base station is by near region unicast user group Signal averaging to broadcasting user group signal, and wherein broadcasting user group signal includes near region broadcasting user group signal and far field broadcasting user group signal；Base station is sent to relative users terminal for signal is sent, wherein the transmission signal includes unicast user group signal and broadcasting user group signal.The present invention is sent together by the way that NOMA subscriber signal is added in broadcast group user group, connects number of users so as to greatly extend MassiveMIMO system.The present invention also greatly increases the flexibility of system, improves channel utilization, improves throughput of system, and increases service number of users.
Description
Technical field
The present invention relates to wireless communication field, in particular to a kind of extensive antenna transmission method, base station, user terminal and
Extensive antenna system.
Background technique
In a wireless communication system, MassiveMIMO (extensive multi-input multi-output system) technology can be with significant increase
Throughput of system, and using Linear Precoding eliminate unicast user between interference realize multiuser MIMO (MU-MIMO,
Multiuser mimo system) further increase flexibility and the channel utilization of system.Due to MassiveMIMO technology
System performance can be made to be substantially improved with spectrum efficiency, thus MassiveMIMO technology be also regarded as one of core technology of 5G and
It is widely studied.
NOMA is as a kind of non-orthogonal multiple technology, and by extensive discussions in potential 5G technology, NOMA is for being promoted
System handling capacity and increase service number of users are of great significance.
Therefore, how effectively NOMA to be combined with MassiveMIMO technology, with further increase system flexibility,
Channel utilization, lifting system handling capacity and increase service number of users, are current technical problems urgently to be resolved.
Summary of the invention
In view of the above technical problem, the present invention provides a kind of extensive antenna transmission method, base station, user terminals and big
NOMA subscriber signal is added in broadcast group user group and sends together, to increase service number of users by scale antenna system.
According to an aspect of the present invention, a kind of extensive antenna transmission method is provided, comprising:
The user of base station coverage area is divided near region broadcasting user group, far field broadcasting user group, near region unicast by base station
User group and far field unicast user group；
Base station is by near region unicast user group Signal averaging to broadcasting user group signal, and wherein broadcasting user group signal includes
Near region broadcasting user group signal and far field broadcasting user group signal；
Base station is sent to relative users terminal for signal is sent, wherein the transmissions signal include unicast user group signal with
Broadcasting user group signal.
In one embodiment of the invention, subscriber signal is sent to relative users terminal and includes: by the base station
Base station carries out precoding to signal is sent using user's pre-coding matrix；
Transmission signal modulation after precoding is radiofrequency signal by base station；
Base station sends the radiofrequency signal modulated from corresponding ports.
In one embodiment of the invention, the base station carries out precoding to signal is sent using user's pre-coding matrix
Include:
Base station sends vector sum second for first and sends addition of vectors composition transmission signal vector, wherein first sends vector
For the vector that group information is broadcasted near region, far field broadcast group information and far field unicast group information are constituted, the second transmission vector is first
The vector that near region unicast group information, the second near region unicast group information and null matrix are constituted；
Base station determines user's pre-coding matrix according to subscriber channel vector, kernel vector sum original precoding matrices；
Base station carries out precoding to transmission signal vector according to user's pre-coding matrix.
In one embodiment of the invention, the subscriber channel vector is near region broadcasting user group matrix, far field broadcast
The column vector of user group matrix, far field unicast user group matrix and near region unicast user group matrix composition.
In one embodiment of the invention, the kernel vector is the first null space matrix, the second null space matrix
The row vector constituted with third null space matrix, wherein the first null space matrix is that far field broadcasting user group matrix and far field are single
The null space matrix of broadcasting user group matrix, the second null space matrix are near region broadcasting user group matrix and far field unicast user group square
The null space matrix of battle array, third null space matrix are that near region broadcasting user group matrix, far field broadcasting user group matrix and far field are single
The null space matrix of broadcasting user group matrix.
In one embodiment of the invention, original precoding matrices are block diagonal matrix, wherein broadcast precoding near region
Matrix, far field broadcast pre-coding matrix and far field unicast pre-coding matrix are respectively at the diagonal positions of block diagonal matrix.
In one embodiment of the invention, the first near region unicast group information and the second near region unicast group information constitute to
Amount is handled to obtain using particular matrix to former near region unicast signal, wherein the particular matrix is the first precoding square
Battle array and the second pre-coding matrix constitute the generalized inverse matrix of vector, and the first pre-coding matrix is near region unicast user group matrix, the
The product of one null space matrix and near region broadcast pre-coding matrix, the second pre-coding matrix are near region unicast user group matrix, the
The product of two null space matrix and far field broadcast pre-coding matrix.
In one embodiment of the invention, the near region unicast user group is non-orthogonal multiple accessing user group.
In one embodiment of the invention, the method also includes:
Near region unicast user terminal receives near region unicast user group and receives signal, wherein the near region unicast user group receives
Signal includes broadcast group information and near region unicast signal composition, wherein the near region unicast signal is by Orthogonal Units battle array and former near region
Unicast signal；
Near region unicast user terminal eliminates broadcast group information using serial interference elimination.
In one embodiment of the invention, the method also includes:
Near region broadcasting user terminal receives near region broadcasting user group and receives signal, wherein the near region broadcasting user group receives
Signal includes near region broadcast singal and near region unicast signal composition；
Near region broadcast and unicast user terminal is using near region unicast signal as noise remove.
In one embodiment of the invention, the method also includes:
Far field broadcasting user terminal receives far field broadcasting user group and receives signal, wherein the far field broadcasting user group receives
Signal includes far field broadcast singal and near region unicast signal composition；
Far field broadcast and unicast user terminal is using near region unicast signal as noise remove.
In one embodiment of the invention, the method also includes:
Far field unicast user terminal receives far field unicast user group and receives signal, wherein the far field unicast user group receives
Signal includes far field unicast signal.
According to another aspect of the present invention, a kind of base station is provided, comprising:
Baseband processing unit, for the user of base station coverage area to be divided near region broadcasting user group, far field broadcast is used
Family group, near region unicast user group and far field unicast user group；And near region unicast user group Signal averaging to broadcasting user group is believed
On number, wherein broadcasting user group signal includes near region broadcasting user group signal and far field broadcasting user group signal；
Large-scale antenna array is sent to relative users terminal for that will send signal, wherein the transmission signal includes
Unicast user group signal and broadcasting user group signal.
In one embodiment of the invention, the base station further includes radio frequency unit, in which:
Baseband processing unit is also used to carry out precoding to signal is sent using user's pre-coding matrix；
Radio frequency unit, for being radiofrequency signal by the transmission signal modulation after precoding；
Large-scale antenna array, for sending the radiofrequency signal modulated from corresponding ports.
In one embodiment of the invention, baseband processing unit includes:
Send vector determining module, for by first send vector sum second send addition of vectors constitute send signal to
Amount, wherein first sends the vector that vector is constituted near region broadcast group information, far field broadcast group information and far field unicast group information,
Second sends the vector that vector is the first near region unicast group information, the second near region unicast group information and null matrix composition；
Pre-coding matrix determining module, for true according to subscriber channel vector, kernel vector sum original precoding matrices
Determine user's pre-coding matrix；
Precoding module, for carrying out precoding to transmission signal vector according to user's pre-coding matrix.
In one embodiment of the invention, the subscriber channel vector is near region broadcasting user group matrix, far field broadcast
The column vector of user group matrix, far field unicast user group matrix and near region unicast user group matrix composition.
In one embodiment of the invention, the kernel vector is the first null space matrix, the second null space matrix
The row vector constituted with third null space matrix, wherein the first null space matrix is that far field broadcasting user group matrix and far field are single
The null space matrix of broadcasting user group matrix, the second null space matrix are near region broadcasting user group matrix and far field unicast user group square
The null space matrix of battle array, third null space matrix are that near region broadcasting user group matrix, far field broadcasting user group matrix and far field are single
The null space matrix of broadcasting user group matrix.
In one embodiment of the invention, original precoding matrices are block diagonal matrix, wherein broadcast precoding near region
Matrix, far field broadcast pre-coding matrix and far field unicast pre-coding matrix are respectively at the diagonal positions of block diagonal matrix.
In one embodiment of the invention, the first near region unicast group information and the second near region unicast group information constitute to
Amount is handled to obtain using particular matrix to former near region unicast signal, wherein the particular matrix is the first precoding square
Battle array and the second pre-coding matrix constitute the generalized inverse matrix of vector, and the first pre-coding matrix is near region unicast user group matrix, the
The product of one null space matrix and near region broadcast pre-coding matrix, the second pre-coding matrix are near region unicast user group matrix, the
The product of two null space matrix and far field broadcast pre-coding matrix.
In one embodiment of the invention, the near region unicast user group is non-orthogonal multiple accessing user group.
According to another aspect of the present invention, a kind of near region unicast user terminal is provided, comprising:
Near region unicast signal receiving module receives signal for receiving near region unicast user group, wherein the near region unicast
It includes broadcast group information and near region unicast signal composition that user group, which receives signal, wherein the near region unicast signal is by Orthogonal Units
Battle array and former near region unicast signal；
Serial interference elimination module, for eliminating broadcast group information using serial interference elimination.
According to another aspect of the present invention, a kind of near region broadcasting user terminal is provided, comprising:
Near region broadcast signal reception module receives signal for receiving near region broadcasting user group, wherein the near region is broadcasted
It includes near region broadcast singal and near region unicast signal composition that user group, which receives signal,；
Noise remove module is broadcasted near region, for using near region unicast signal as noise remove.
According to another aspect of the present invention, a kind of far field broadcasting user terminal is provided, comprising:
Far field broadcast signal reception module receives signal for receiving far field broadcasting user group, wherein the far field is broadcasted
It includes far field broadcast singal and near region unicast signal composition that user group, which receives signal,；
Noise remove module is broadcasted in far field, for using near region unicast signal as noise remove.
According to another aspect of the present invention, a kind of far field unicast user terminal is provided, wherein the far field unicast user is whole
End receives signal for receiving far field unicast user group, wherein it includes far field unicast letter that the far field unicast user group, which receives signal,
Number.
According to another aspect of the present invention, a kind of extensive antenna system is provided, including user terminal and as any of the above-described
Base station described in embodiment, wherein the user terminal include near region unicast user terminal as described in above-mentioned any embodiment,
Near region broadcasting user terminal as described in above-mentioned any embodiment, the far field broadcasting user terminal as described in above-mentioned any embodiment
And at least one of far field unicast user terminal as described in above-mentioned any embodiment.
The present invention is sent together by the way that NOMA subscriber signal is added in broadcast group user group, so as to greatly expand
Exhibition MassiveMIMO system connects number of users.The present invention also greatly increases the flexibility of system, improves channel usage
Rate improves throughput of system, and increases service number of users.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the schematic diagram of the extensive antenna system first embodiment of the present invention.
Fig. 2 is the schematic diagram of the extensive antenna system second embodiment of the present invention.
Fig. 3 is the schematic diagram of base station one embodiment of the present invention.
Fig. 4 is the schematic diagram of baseband processing unit in one embodiment of the invention.
Fig. 5 is the schematic diagram of extensive antenna system model in one embodiment of the invention.
Fig. 6 is the schematic diagram of extensive antenna system transmission channel model in one embodiment of the invention.
Fig. 7 is the schematic diagram that kernel divides in one embodiment of the invention.
Fig. 8 is the schematic diagram of unicast user terminal one embodiment near region of the present invention.
Fig. 9 is the schematic diagram that near region unicast user terminal receives model in one embodiment of the invention.
Figure 10 is the schematic diagram that unicast group information near region is obtained in one embodiment of the invention.
Figure 11 is the schematic diagram that near region unicast user terminal receives model in another embodiment of the present invention.
Figure 12 is the schematic diagram of broadcasting user terminal one embodiment near region of the present invention.
Figure 13 is the schematic diagram of broadcasting user terminal one embodiment in far field of the present invention.
Figure 14 is the schematic diagram of the extensive antenna transmission method first embodiment of the present invention.
Figure 15 is the schematic diagram of the extensive antenna transmission method second embodiment of the present invention.
Figure 16 is the schematic diagram of pre-encode operation in the broadcasting user group of near region in one embodiment of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.
Simultaneously, it should be appreciated that for ease of description, the size of various pieces shown in attached drawing is not according to reality
Proportionate relationship draw.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
Fig. 1 is the schematic diagram of the extensive antenna system first embodiment of the present invention.As shown in Figure 1, the extensive antenna
System includes base station 100 and user terminal 200, in which:
Base station 100, for the overlay area of base station to be divided into two regions: near region (Near-area) and far field (Far-
area)；And the user of base station coverage area is divided near region broadcasting user group, far field broadcasting user group, near region unicast user
Group and far field unicast user group.
Fig. 2 is the schematic diagram of the extensive antenna system second embodiment of the present invention.As shown in Fig. 2, the user of Fig. 1 embodiment
Terminal 200 may include near region unicast user terminal 210, near region broadcasting user terminal 220, far field broadcasting user terminal 230 with
And at least one of far field unicast user terminal 240.
Base station 100, for by near region unicast user group Signal averaging to broadcasting user group signal, wherein broadcasting user group
Signal includes near region broadcasting user group signal and far field broadcasting user group signal；And signal will be sent and be sent to relative users end
End, wherein the transmission signal includes unicast user group signal and broadcasting user group signal.
In one embodiment of the invention, the near region unicast user group is that non-orthogonal multiple accesses (NOMA) user
Group.
Near region broadcasting user terminal 220 and far field broadcasting user terminal 230 () (broadcasting user being applied), for connecing
NOMA subscriber signal is regarded noise processed by the time receiving, is received process and is made no modifications.
Near region unicast user terminal 210 (NOMA user) is eliminated wide for utilizing serial interference elimination and precoding technique
Broadcast the interference inside the influence and NOMA user of group.
Extensive day based on the backpack NOMA technology based on serial interference elimination that the above embodiment of the present invention provides
Linear system system, NOMA subscriber signal is added in broadcast group user group and is sent together, and is reduced by power control and used broadcast
The interference at family.For the broadcasting user being applied, NOMA subscriber signal is regarded into noise processed when receiving, process is received and does not do
Any modification.Influence and the NOMA user of broadcast group are eliminated using serial interference elimination and precoding technique for NOMA user
Internal interference.
What the above embodiment of the present invention can greatly extend MassiveMIMO system connects number of users.In the present invention
The flexibility that embodiment considerably increases system is stated, channel utilization is improved, improves throughput of system, and increases service
Number of users.
It is carried out below by structure and function of the specific embodiment to base station in the above embodiment of the present invention and user terminal
It further illustrates.
Fig. 3 is the schematic diagram of base station one embodiment of the present invention.As shown in figure 3, the base station 100 of Fig. 1 or Fig. 2 embodiment can
To include baseband processing unit 110, radio frequency unit 120 and large-scale antenna array 130, in which:
Baseband processing unit 110, for the user of 100 overlay area of base station to be divided near region broadcasting user group, far field
Broadcasting user group, near region unicast user group and far field unicast user group；And near region unicast user group Signal averaging is used to broadcast
On the group signal of family, wherein broadcasting user group signal includes near region broadcasting user group signal and far field broadcasting user group signal；Using
User's pre-coding matrix to send signal carry out precoding, wherein the transmissions signal include near region unicast user group signal, far
Area's unicast user group signal, near region broadcasting user group signal and far field broadcasting user group signal.
In one embodiment of the invention, the near region unicast user group is non-orthogonal multiple accessing user group.
Radio frequency unit 120, for being radiofrequency signal by the transmission signal modulation after 110 precoding of baseband processing unit.
Large-scale antenna array 130, for the radiofrequency signal modulated to be sent to relative users end from corresponding ports
End.
Based on the base station that the above embodiment of the present invention provides, NOMA subscriber signal is added in broadcast group user group together
It sends, and the interference to broadcasting user is reduced by power control.For the broadcasting user being applied, this method exists
NOMA user is added in broadcasting user by the method in MassiveMIMO system based on serial interference elimination, considerably increases
The number of system service user.
Fig. 4 is the schematic diagram of baseband processing unit in one embodiment of the invention.As shown in figure 4, the base in Fig. 3 embodiment
Tape handling unit 110 may include sending vector determining module 110, pre-coding matrix determining module 120 and precoding module
130, in which:
Vector determining module 110 is sent, sends signal for sending the transmission addition of vectors composition of vector sum second for first
Vector, wherein as shown in Figure 5 and Figure 6, first, which sends vector, broadcasts group information A, far field broadcast group information B and far field near region
The vector S that unicast group information is constitutedf, second sends vector as the first near region unicast group information S1, the second near region unicast group information S2
The vector constituted with null matrix, wherein the first near region unicast group information S1, the second near region unicast group information S2For the broadcast group that is added to
NOMA group information.
Pre-coding matrix determining module 120, for according to subscriber channel vector, kernel vector sum original precoding matrices
Determine user's pre-coding matrix.
Fig. 5 is the schematic diagram of extensive antenna system model in one embodiment of the invention.Fig. 6 is one implementation of the present invention
The schematic diagram of extensive antenna system transmission channel model in example.Wherein Fig. 5 embodiment gives subscriber channel vector, kernel
The schematic diagram of vector sum original precoding matrices, and Fig. 6 then give it is original pre- by subscriber channel vector, kernel vector sum
The schematic diagram for user's pre-coding matrix that encoder matrix determines.Received signal vector in Fig. 5 and Fig. 6 embodiment is wide by near region
Broadcasting user receiving matrix Y1, far field broadcasting user receiving matrix Y2, far field unicast user receiving matrix YfIt is connect near region unicast user
Receive matrix YnThe column vector of composition
As shown in figure 5, the subscriber channel vector is near region broadcasting user group matrix M1, far field broadcasting user group matrix M2、
Far field unicast user group matrix UfWith near region unicast user group matrix UnThe column vector of composition.
In Fig. 5 embodiment, original precoding matrices are block diagonal matrix, wherein broadcast pre-coding matrix P near region1, it is remote
Broadcast pre-coding matrix P in area2With far field unicast pre-coding matrix PfIt is respectively at the diagonal positions of block diagonal matrix.
In Fig. 5 embodiment, the kernel vector is the first null space matrix J1, the second null space matrix J2And third
Null space matrix JfThe row vector of composition.
Fig. 7 is the schematic diagram that kernel divides in one embodiment of the invention.As shown in fig. 7, leading between the application each group
Kernel is crossed mutually to distinguish, in which:
First null space matrix J1(near region broadcasting user group matrix M1It is corresponding) it is far field broadcasting user group matrix M2With
Far field unicast user group matrix UfNull space matrix.
That is, M2J1=0, UfJ1=0.
Second null space matrix J2(with far field broadcasting user group matrix M2It is corresponding) it is near region broadcasting user group matrix M1With
Far field unicast user group matrix UfNull space matrix.
That is, M1J2=0, UfJ2=0.
Third null space matrix Jf(with far field unicast user group matrix UfIt is corresponding) it is near region broadcasting user group matrix M1、
Far field broadcasting user group matrix M2With near region unicast user group matrix UnNull space matrix.That is, M1Jf=0, M1Jf=0, UnJ2=
0。
4th null space matrix Jn(near region unicast user group matrix UnIt is corresponding) it is far field unicast user group matrix Uf's
Null space matrix.That is, MfJn=0.
Precoding module 130 is specific as schemed for carrying out precoding to transmission signal vector according to user's pre-coding matrix
Shown in 6.
Thus the present invention can be according to user's pre-coding matrix of Fig. 6 embodiment respectively near region broadcasting user group, far field
Broadcasting user group, near region unicast user group and far field unicast user group are into carrying out corresponding pre-encode operation.
Figure 16 is the schematic diagram of pre-encode operation in the broadcasting user group of near region in one embodiment of the invention.Such as Figure 16 institute
Show, the pre-encode operation may include: by near region broadcasting user group matrix M1With the first null space matrix J1Generate near region broadcast
The equivalent matrix M ' of user group1；According to the equivalent matrix M ' of near region broadcasting user group1Pre-coding matrix P is broadcasted near region1It is handled,
Obtain new near region broadcast pre-coding matrix M1J1P1；To broadcast pre-coding matrix M using new near region later1J1P1To near region
Broadcast singal A is handled.
The present invention can use far field broadcasting user group, near region unicast user group and far field unicast user group similar
Method carries out pre-encode operation in group, and I will not elaborate.
What the above embodiment of the present invention can greatly extend MassiveMIMO system connects number of users.In the present invention
The flexibility that embodiment considerably increases system is stated, channel utilization is improved, improves throughput of system, and increases service
Number of users.
The above embodiment of the present invention does not limit the implementation of precoding, has great flexibility, the above-mentioned reality of the present invention
Applying example and existing MIMO precoding algorithms has good compatibility.
Fig. 8 is the schematic diagram of unicast user terminal one embodiment near region of the present invention.As shown in figure 8, the near region unicast
User terminal 210 may include near region unicast signal receiving module 211 and serial interference elimination module 212, in which:
Near region unicast signal receiving module 211 receives signal for receiving near region unicast user group, wherein the near region is single
It includes broadcast group information and near region unicast signal composition that broadcasting user group, which receives signal, wherein the near region unicast signal is by positive presentate
Position battle array and former near region unicast signal.
Fig. 9 is the schematic diagram that near region unicast user terminal receives model in one embodiment of the invention.Fig. 9 embodiment connects
Acquisition can be calculated by the extensive antenna system transmission channel model of Fig. 6 embodiment by receiving model.
Figure 10 is the schematic diagram that unicast group information near region is obtained in one embodiment of the invention.As shown in Figure 10, first is close
Area's unicast group information S1With the second near region unicast group information S2The vector of composition is using particular matrix to former near region unicast signal Sn
It is handled, wherein the particular matrix is the broad sense that the first pre-coding matrix and the second pre-coding matrix constitute vector
Inverse matrix, the first pre-coding matrix are near region unicast user group matrix Un, the first null space matrix J1Precoding square is broadcasted near region
Battle array P1Product, the second pre-coding matrix be near region unicast user group matrix Un, the second null space matrix J2It prelists with far field broadcast
Code matrix P2Product.
Serial interference elimination module 212, for eliminating broadcast group information using serial interference elimination.
Figure 11 is the schematic diagram that near region unicast user terminal receives model in another embodiment of the present invention.It is connect shown in Figure 11
Receiving model can be obtained by the way that the formula of Figure 10 to be brought into the reception model of Fig. 9.
In Figure 11 embodiment, receive the first part of signal as broadcast group information, using serial interference elimination by this
A part interference removes.Such as: if near region unicast user terminal knows the first null space matrix J1With the second null space matrix
J2, near region unicast user terminal can using serial interference elimination mode eliminate this part interference.And the letter of second part
Road part turns to Orthogonal Units battle array by precoding process as shown in figure 11.
Near region unicast user terminal based on the above embodiment of the present invention, can use serial interference elimination and precoding skill
Art eliminates the interference inside the influence and NOMA user of broadcast group.
Figure 12 is the schematic diagram of broadcasting user terminal one embodiment near region of the present invention.As shown in figure 12, the near region is wide
Broadcasting user terminal 220 may include near region broadcast signal reception module 221 and near region broadcast noise remove module 222, in which:
Near region broadcast signal reception module 221 receives signal for receiving near region broadcasting user group, wherein the near region is wide
It includes near region broadcast singal and near region unicast signal composition that broadcasting user group, which receives signal,.
In an embodiment of the invention, the extensive antenna system transmission channel model meter of Fig. 6 embodiment can be passed through
The reception model for obtaining near region broadcasting user terminal is calculated, it is specific as shown in formula (1).
Y1=M1J1P1·A+M1J1P1·S1 (1)
Noise remove module 222 is broadcasted near region, is used near region unicast signal M1J1P1·S1As noise remove.
Near region broadcasting user terminal based on the above embodiment of the present invention can regard NOMA subscriber signal when receiving
Noise processed receives process and makes no modifications.
In an embodiment of the invention, the first near region unicast group information S in formula (1) can be enabled1It is 0.
Thus the above embodiment of the present invention can make the broadcast group near region use normal broadcast precoding technique；
And the broadcasting user in far field will be higher due to sending power, be conducive to serial interference elimination, will be used to bear NOMA group use
Family.
Figure 13 is the schematic diagram of broadcasting user terminal one embodiment in far field of the present invention.As shown in figure 12, the far field is wide
Broadcasting user terminal 230 may include far field broadcast signal reception module 231 and far field broadcast noise remove module 232, in which:
Far field broadcast signal reception module receives signal for receiving far field broadcasting user group, wherein the far field is broadcasted
It includes far field broadcast singal and near region unicast signal composition that user group, which receives signal,；
In an embodiment of the invention, the extensive antenna system transmission channel model meter of Fig. 6 embodiment can be passed through
The reception model for obtaining far field broadcasting user terminal is calculated, it is specific as shown in formula (2).
Y2=M2J2P2·B+M2J2P2·S2 (2)
Noise remove module is broadcasted in far field, is used near region unicast signal M2J2P2·S2As noise remove.
Far field broadcasting user terminal based on the above embodiment of the present invention can regard NOMA subscriber signal when receiving
Noise processed receives process and makes no modifications.Broadcasting user in the above embodiment of the present invention in far field will be due to sending
Power is higher, is conducive to serial interference elimination, will be used to bear NOMA group user.
According to another aspect of the present invention, a kind of far field unicast user terminal 240 is provided, wherein the far field unicast user
Terminal 240 receives signal for receiving far field unicast user group, wherein it includes far field that the far field unicast user group, which receives signal,
Unicast signal.
In an embodiment of the invention, the extensive antenna system transmission channel model meter of Fig. 6 embodiment can be passed through
The reception model for obtaining far field unicast user terminal is calculated, it is specific as shown in formula (3).
Yf=MfJfPf·Sf (3)
The overlay area of base station is divided into two regions near region and far field by the above embodiment of the present invention, by the unicast of near region
User is divided into NOMA group, and the unicast user in far field uses normal MU-MIMO precoding technique.The above embodiment of the present invention will
Broadcast group near region using normal broadcast precoding technique, the broadcasting user in far field will due to send power compared with
Height is conducive to serial interference elimination, will be used to bear NOMA group user.NOMA subscriber signal is superimposed by the above embodiment of the present invention
It is sent together on to broadcast group user group, and the interference to broadcasting user is reduced by power control.The above embodiment of the present invention
For the broadcasting user being applied, NOMA subscriber signal is regarded into noise processed when receiving, process is received and makes no modifications.
The above embodiment of the present invention is for NOMA user, using serial interference elimination and precoding technique, eliminate broadcast group influence and
Interference inside NOMA user.
By the above processing of the above embodiment of the present invention, connecting for MassiveMIMO system can be greatly extended
Number of users.Thus the above embodiment of the present invention considerably increases the flexibility of system, improves channel utilization, improves system
Handling capacity, and increase service number of users.
Figure 14 is the schematic diagram of the extensive antenna transmission method first embodiment of the present invention.Preferably, the present embodiment can be by
The extensive antenna system of the present invention executes.As shown in figure 14, the method may include:
Step 1, the user of 100 overlay area of base station is divided near region broadcasting user group, far field broadcasting user by base station 100
Group, near region unicast user group and far field unicast user group.
In one embodiment of the invention, the near region unicast user group is non-orthogonal multiple accessing user group.
Step 2, base station 100 is by near region unicast user group Signal averaging to broadcasting user group signal, wherein broadcasting user
Group signal includes near region broadcasting user group signal and far field broadcasting user group signal.
Step 3, base station 100 is sent to relative users terminal for signal is sent, wherein the transmission signal includes that unicast is used
Family group signal and broadcasting user group signal.
In one embodiment of the invention, step 3 may include:
Step 31, base station 100 carries out precoding to signal is sent using user's pre-coding matrix.
In one embodiment of the invention, step 31 may include:
Step 311, base station 100 sends vector sum second for first and sends addition of vectors composition transmission signal vector, wherein
First sends the vector that vector is near region broadcast group information, group information and far field unicast group information composition are broadcasted in far field, the second hair
The amount of being sent to is the vector that the first near region unicast group information, the second near region unicast group information and null matrix are constituted.
In one embodiment of the invention, the first near region unicast group information and the second near region unicast group information constitute to
Amount is handled to obtain using particular matrix to former near region unicast signal, wherein the particular matrix is the first precoding square
Battle array and the second pre-coding matrix constitute the generalized inverse matrix of vector, and the first pre-coding matrix is near region unicast user group matrix, the
The product of one null space matrix and near region broadcast pre-coding matrix, the second pre-coding matrix are near region unicast user group matrix, the
The product of two null space matrix and far field broadcast pre-coding matrix.
Step 312, base station 100 determines that user is pre- according to subscriber channel vector, kernel vector sum original precoding matrices
Encoder matrix.
In one embodiment of the invention, the subscriber channel vector is near region broadcasting user group matrix, far field broadcast
The column vector of user group matrix, far field unicast user group matrix and near region unicast user group matrix composition.
In one embodiment of the invention, the kernel vector is the first null space matrix, the second null space matrix
The row vector constituted with third null space matrix, wherein the first null space matrix is that far field broadcasting user group matrix and far field are single
The null space matrix of broadcasting user group matrix, the second null space matrix are near region broadcasting user group matrix and far field unicast user group square
The null space matrix of battle array, third null space matrix are that near region broadcasting user group matrix, far field broadcasting user group matrix and far field are single
The null space matrix of broadcasting user group matrix.
In one embodiment of the invention, original precoding matrices are block diagonal matrix, wherein broadcast precoding near region
Matrix, far field broadcast pre-coding matrix and far field unicast pre-coding matrix are respectively at the diagonal positions of block diagonal matrix.
Step 313, base station 100 carries out precoding to transmission signal vector according to user's pre-coding matrix.
Step 32, the transmission signal modulation after precoding is radiofrequency signal by base station 100.
Step 33, base station 100 sends the radiofrequency signal modulated from corresponding ports.
Figure 15 is the schematic diagram of the extensive antenna transmission method second embodiment of the present invention.Preferably, the present embodiment can be by
The extensive antenna system of the present invention executes.After the step 3 of Figure 14 embodiment, the method for Figure 15 embodiment can also include:
Step 4, near region unicast user terminal 210 receives near region unicast user group and receives signal, wherein the near region unicast
It includes broadcast group information and near region unicast signal composition that user group, which receives signal, wherein the near region unicast signal is by Orthogonal Units
Battle array and former near region unicast signal.
Step 5, near region unicast user terminal 210 eliminates broadcast group information using serial interference elimination.
Step 6, near region broadcasting user terminal 220 receives near region broadcasting user group and receives signal, wherein the near region is broadcasted
It includes near region broadcast singal and near region unicast signal composition that user group, which receives signal,.
Step 7, broadcast and unicast user terminal near region is using near region unicast signal as noise remove.
Step 8, far field broadcasting user terminal 230 receives far field broadcasting user group and receives signal, wherein the far field is broadcasted
It includes far field broadcast singal and near region unicast signal composition that user group, which receives signal,.
Step 9, broadcast and unicast user terminal in far field is using near region unicast signal as noise remove.
Step 10, far field unicast user terminal 240 receives far field unicast user group and receives signal, wherein the far field unicast
It includes far field unicast signal that user group, which receives signal,.
Based on the extensive antenna transmission method that the above embodiment of the present invention provides, the overlay area of base station is divided into two
The unicast user of near region is divided into NOMA group by a region near region and far field, and the unicast user in far field uses normal MU-MIMO
Precoding technique.Broadcast group near region using normal broadcast precoding technique, is in remote by the above embodiment of the present invention
The broadcasting user in area will be higher due to sending power, be conducive to serial interference elimination, will be used to bear NOMA group user.The present invention
NOMA subscriber signal is added in broadcast group user group and sends together by above-described embodiment, and is reduced by power control to broadcast
The interference of user.NOMA subscriber signal is regarded when receiving and is made an uproar for the broadcasting user being applied by the above embodiment of the present invention
Sonication receives process and makes no modifications.The above embodiment of the present invention is for NOMA user, using serial interference elimination and in advance
Coding techniques eliminates the interference inside the influence and NOMA user of broadcast group.
By the above processing of the above embodiment of the present invention, connecting for MassiveMIMO system can be greatly extended
Number of users.Thus the above embodiment of the present invention considerably increases the flexibility of system, improves channel utilization, improves system
Handling capacity, and increase service number of users.
The above embodiment of the present invention does not limit the implementation of precoding, has great flexibility, the above-mentioned reality of the present invention
Applying example and existing MIMO precoding algorithms has good compatibility.
Noise remove mould is broadcasted in baseband processing unit 110 described above, serial interference elimination module 212, near region
The functional modules such as block 222 and far field broadcast noise remove module 232 can be implemented as executing function described herein
General processor, programmable logic controller (PLC) (PLC), digital signal processor (DSP), specific integrated circuit (ASIC), scene
Programmable gate array (FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware group
Part or it is any appropriately combined.
So far, the present invention is described in detail.In order to avoid covering design of the invention, it is public that this field institute is not described
The some details known.Those skilled in the art as described above, completely it can be appreciated how implementing technology disclosed herein
Scheme.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
Description of the invention is given for the purpose of illustration and description, and is not exhaustively or will be of the invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage
The solution present invention is to design various embodiments suitable for specific applications with various modifications.
Claims (19)
1. a kind of extensive antenna transmission method characterized by comprising
The user of base station coverage area is divided near region broadcasting user group, far field broadcasting user group, near region unicast user by base station
Group and far field unicast user group；
Base station is by near region unicast user group Signal averaging to broadcasting user group signal, and wherein broadcasting user group signal includes near region
Broadcasting user group signal and far field broadcasting user group signal；
Base station is sent to relative users terminal for signal is sent, wherein the transmission signal includes unicast user group signal and broadcast
User group signal.
2. the method according to claim 1, wherein subscriber signal is sent to relative users terminal by the base station
Include:
Base station carries out precoding to signal is sent using user's pre-coding matrix；
Transmission signal modulation after precoding is radiofrequency signal by base station；
Base station sends the radiofrequency signal modulated from corresponding ports.
3. according to the method described in claim 2, it is characterized in that, the base station is using user's pre-coding matrix to transmission signal
Carrying out precoding includes:
Base station sends vector sum second for first and sends addition of vectors composition transmission signal vector, wherein the first transmission vector is close
The vector that area broadcasts group information, far field broadcast group information and far field unicast group information are constituted, second sends vector as the first near region
The vector that unicast group information, the second near region unicast group information and null matrix are constituted；
Base station determines user's pre-coding matrix according to subscriber channel vector, kernel vector sum original precoding matrices；
Base station carries out precoding to transmission signal vector according to user's pre-coding matrix.
4. according to the method described in claim 3, it is characterized in that,
The subscriber channel vector is near region broadcasting user group matrix, far field broadcasting user group matrix, far field unicast user group square
The column vector of battle array and near region unicast user group matrix composition；
And/or
The kernel vector be the row that constitutes of the first null space matrix, the second null space matrix and third null space matrix to
Amount, wherein the first null space matrix is the null space matrix of far field broadcasting user group matrix and far field unicast user group matrix, the
Two null space matrix are the null space matrix of near region broadcasting user group matrix and far field unicast user group matrix, third kernel square
Battle array is the null space matrix of near region broadcasting user group matrix, far field broadcasting user group matrix and far field unicast user group matrix；
And/or
Original precoding matrices are block diagonal matrix, wherein pre-coding matrix is broadcasted near region, pre-coding matrix is broadcasted in far field and remote
Area's unicast pre-coding matrix is respectively at the diagonal positions of block diagonal matrix；
And/or
The vector that first near region unicast group information and the second near region unicast group information are constituted is single to former near region using particular matrix
Broadcast what signal was handled, wherein the particular matrix is that the first pre-coding matrix and the second pre-coding matrix constitute vector
Generalized inverse matrix, the first pre-coding matrix be near region unicast user group matrix, the first null space matrix and near region broadcast prelist
The product of code matrix, the second pre-coding matrix are that near region unicast user group matrix, the second null space matrix and far field broadcast prelist
The product of code matrix.
5. method according to any of claims 1-4, which is characterized in that
The near region unicast user group is non-orthogonal multiple accessing user group.
6. method according to any of claims 1-4, which is characterized in that further include:
Near region unicast user terminal receives near region unicast user group and receives signal, wherein the near region unicast user group receives signal
Including broadcast group information and near region unicast signal composition, wherein the near region unicast signal is by Orthogonal Units battle array and former near region unicast
Signal；
Near region unicast user terminal eliminates broadcast group information using serial interference elimination.
7. method according to any of claims 1-4, which is characterized in that further include:
Near region broadcasting user terminal receives near region broadcasting user group and receives signal, wherein the near region broadcasting user group receives signal
It is formed including near region broadcast singal and near region unicast signal；
Near region broadcast and unicast user terminal is using near region unicast signal as noise remove.
8. method according to any of claims 1-4, which is characterized in that further include:
Far field broadcasting user terminal receives far field broadcasting user group and receives signal, wherein the far field broadcasting user group receives signal
It is formed including far field broadcast singal and near region unicast signal；
Far field broadcast and unicast user terminal is using near region unicast signal as noise remove.
9. method according to any of claims 1-4, which is characterized in that further include:
Far field unicast user terminal receives far field unicast user group and receives signal, wherein the far field unicast user group receives signal
Including far field unicast signal.
10. a kind of base station characterized by comprising
Baseband processing unit, for by the user of base station coverage area be divided near region broadcasting user group, far field broadcasting user group,
Near region unicast user group and far field unicast user group；And by near region unicast user group Signal averaging to broadcasting user group signal,
Wherein broadcasting user group signal includes near region broadcasting user group signal and far field broadcasting user group signal；
Large-scale antenna array is sent to relative users terminal for that will send signal, wherein the transmission signal includes unicast
User group signal and broadcasting user group signal.
11. base station according to claim 10, which is characterized in that further include radio frequency unit, in which:
Baseband processing unit is also used to carry out precoding to signal is sent using user's pre-coding matrix；
Radio frequency unit, for being radiofrequency signal by the transmission signal modulation after precoding；
Large-scale antenna array, for sending the radiofrequency signal modulated from corresponding ports.
12. base station according to claim 11, which is characterized in that baseband processing unit includes:
Vector determining module is sent, sends addition of vectors composition transmission signal vector for sending vector sum second for first,
In first to send vector be that group information is broadcasted near region, the vector that group information and far field unicast group information are constituted is broadcasted in far field, second
Transmission vector is the vector that the first near region unicast group information, the second near region unicast group information and null matrix are constituted；
Pre-coding matrix determining module is used for being determined according to subscriber channel vector, kernel vector sum original precoding matrices
Family pre-coding matrix；
Precoding module, for carrying out precoding to transmission signal vector according to user's pre-coding matrix.
13. base station according to claim 12, which is characterized in that
The subscriber channel vector is near region broadcasting user group matrix, far field broadcasting user group matrix, far field unicast user group square
The column vector of battle array and near region unicast user group matrix composition；
And/or
The kernel vector be the row that constitutes of the first null space matrix, the second null space matrix and third null space matrix to
Amount, wherein the first null space matrix is the null space matrix of far field broadcasting user group matrix and far field unicast user group matrix, the
Two null space matrix are the null space matrix of near region broadcasting user group matrix and far field unicast user group matrix, third kernel square
Battle array is the null space matrix of near region broadcasting user group matrix, far field broadcasting user group matrix and far field unicast user group matrix；
And/or
Original precoding matrices are block diagonal matrix, wherein pre-coding matrix is broadcasted near region, pre-coding matrix is broadcasted in far field and remote
Area's unicast pre-coding matrix is respectively at the diagonal positions of block diagonal matrix；
And/or
The vector that first near region unicast group information and the second near region unicast group information are constituted is single to former near region using particular matrix
Broadcast what signal was handled, wherein the particular matrix is that the first pre-coding matrix and the second pre-coding matrix constitute vector
Generalized inverse matrix, the first pre-coding matrix be near region unicast user group matrix, the first null space matrix and near region broadcast prelist
The product of code matrix, the second pre-coding matrix are that near region unicast user group matrix, the second null space matrix and far field broadcast prelist
The product of code matrix.
14. base station described in any one of 0-11 according to claim 1, which is characterized in that
The near region unicast user group is non-orthogonal multiple accessing user group.
15. a kind of near region unicast user terminal characterized by comprising
Near region unicast signal receiving module receives signal for receiving near region unicast user group, wherein the near region unicast user
It includes broadcast group information and near region unicast signal composition that group, which receives signal, wherein the near region unicast signal by Orthogonal Units battle array and
Former near region unicast signal；
Serial interference elimination module, for eliminating broadcast group information using serial interference elimination.
16. a kind of near region broadcasting user terminal characterized by comprising
Near region broadcast signal reception module receives signal for receiving near region broadcasting user group, wherein the near region broadcasting user
It includes near region broadcast singal and near region unicast signal composition that group, which receives signal,；
Noise remove module is broadcasted near region, for using near region unicast signal as noise remove.
17. a kind of far field broadcasting user terminal characterized by comprising
Far field broadcast signal reception module receives signal for receiving far field broadcasting user group, wherein the far field broadcasting user
It includes far field broadcast singal and near region unicast signal composition that group, which receives signal,；
Noise remove module is broadcasted in far field, for using near region unicast signal as noise remove.
18. a kind of far field unicast user terminal, which is characterized in that the far field unicast user terminal is for receiving far field unicast use
Family group receives signal, wherein it includes far field unicast signal that the far field unicast user group, which receives signal,.
19. a kind of extensive antenna system, which is characterized in that including user terminal and such as any one of claim 10-14 institute
The base station stated, wherein the user terminal includes unicast user terminal near region as claimed in claim 15, such as claim 16
The near region broadcasting user terminal, broadcasting user terminal in far field as claimed in claim 17 and as claimed in claim 18
At least one of far field unicast user terminal.
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| CN111246578A (en) * | 2020-01-09 | 2020-06-05 | 北京航空航天大学杭州创新研究院 | NOMA downlink communication method under directional antenna scene |
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