CN110011710B - Pre-coding matrix generation method and pre-coding matrix generation device - Google Patents
Pre-coding matrix generation method and pre-coding matrix generation device Download PDFInfo
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Abstract
The invention provides a precoding matrix generation method and a precoding matrix generation device, wherein the method comprises the following steps: selecting a preset number of transmitting antenna ports from a plurality of transmitting antenna ports of a transmitting end to form a transmitting antenna port subset; calculating a first multi-user multiple-input multiple-output preprocessing matrix used by a user on a transmitting antenna port subset of a first resource; obtaining a second multi-user multi-input multi-output preprocessing matrix used by the user on the transmitting antenna port subset of the second resource according to the first multi-user multi-input multi-output preprocessing matrix; and obtaining a precoding matrix used by the user in a hybrid transmission mode on a plurality of transmitting antenna ports according to the first multi-user multi-input multi-output preprocessing matrix and the second multi-user multi-input multi-output preprocessing matrix. The precoding matrix generation scheme of the invention is suitable for multi-user multi-input multi-output scenes.
Description
Technical Field
The present invention relates to the field of wireless technologies, and in particular, to a precoding matrix generation method and a precoding matrix generation apparatus.
Background
With the development of global high-speed rail technology, the high-speed rail in China also has been developed rapidly, the operating mileage of the high-speed rail in China reaches 2 ten thousand kilometers by the end of 2016, and passengers exceed 50 hundred million people. On rail transit stations and lines, the mobile phone data traffic of passengers is positively correlated with the time in transit, and according to prediction, the annual data traffic in a high-speed railway scene exceeds 2 trillion MB. Therefore, high-speed rail communication has been developed into a very important class of mobile communication scenarios in china, and even globally.
MIMO (Multiple-Input Multiple-Output) transmission modes that can be actually supported by the 3GPP (third generation partnership project) LTE (Long Term Evolution)/LTE-Advanced standard in a 4G (fourth generation mobile communication technology) existing network high speed mobile (high-speed rail) scene are TM2(transmission mode 2) and TM3(transmission mode 3, transmission mode 3), i.e., SFBC (Space Frequency Block Code ) + FSTD (Frequency Switch Transmit Diversity) and Cyclic Delay Diversity). However, considering the characteristics of the high-speed mobile actual channel propagation environment (CDD is single-user multi-stream transmission and needs a richer channel scattering environment, a channel model in an actual high-speed rail scene is usually modeled as a Rician channel, that is, the energy/power of a direct path is stronger than that of a non-direct path), the most frequently used transmission mode is an SFBC transmission method of two antenna ports (SFBC + FSTD when 4 antenna ports are used).
At present, the maximum moving speed supported by the 3GPP LTE/LTE-Advanced standard is 350km/h, and the requirement of 5G (fourth generation mobile communication technology) -NR (New Radio, New air interface) for the moving speed is raised to 500km/h, so that it is very necessary to enhance the Performance of the mobile communication capability in a high-speed moving scene in order to ensure Key Performance Indicators (KPIs) such as user experience rate, system spectrum efficiency, handover success rate, and the like in the high-speed moving scene at maximum 500 km/h.
However, as described above, since the SFBC transmission scheme belongs to a transmit diversity method, the SFBC transmission scheme is designed to improve the SNR (Signal Noise Ratio) of a user, and the improvement effect on the system spectrum efficiency is limited. For the conventional MU-MIMO (Multi-User Multiple-Input Multiple-Output ), the performance advantage is generally required to be reflected under the condition that the more accurate CSIT (channel state information) is known. In conclusion, how to obtain higher spectral efficiency performance in a high spectral efficiency scheme under the condition that perfect CSIT cannot be obtained is still a problem to be solved.
Disclosure of Invention
The embodiment of the invention can provide a precoding matrix generation method and a precoding matrix generation device under the transmission diversity and MU-MIMO mixed transmission mode.
The embodiment of the invention provides the following technical scheme:
in one aspect, a method for generating a precoding matrix is provided, including:
selecting a preset number of transmitting antenna ports from a plurality of transmitting antenna ports of a transmitting end to form a transmitting antenna port subset;
calculating a first multi-user multiple-input multiple-output pre-processing matrix used by a user on the subset of transmit antenna ports of a first resource;
obtaining a second multi-user multi-input multi-output preprocessing matrix used by the user on the transmitting antenna port subset of a second resource according to the first multi-user multi-input multi-output preprocessing matrix, wherein the first multi-user multi-input multi-output preprocessing matrix and the second multi-user multi-input multi-output preprocessing matrix are unitary matrixes with each other;
and obtaining a precoding matrix used by the user in a hybrid transmission mode on the plurality of sending antenna ports according to the first multi-user multi-input multi-output preprocessing matrix and the second multi-user multi-input multi-output preprocessing matrix.
Further, the obtaining, according to the first multi-user multiple-input multiple-output preprocessing matrix and the second multi-user multiple-input multiple-output preprocessing matrix, a codebook used by the user in a hybrid transmission mode over the multiple transmit antenna ports includes:
and according to the first multi-user multi-input multi-output preprocessing matrix and the second multi-user multi-input multi-output preprocessing matrix, expanding in a unitary matrix manner to obtain a precoding matrix used by the user in a hybrid transmission mode on the multiple transmitting antenna ports, wherein two columns in the precoding matrix respectively correspond to the first resource and the second resource.
Further, the step of obtaining the multi-user multiple-input multiple-output pre-processing matrix comprises:
obtaining a multi-user multi-input multi-output preprocessing matrix according to channel calculation; or
And receiving a multi-user multi-input multi-output preprocessing matrix selected from a predefined codebook set by a user according to the scheduling and pairing result of the multi-user multi-input multi-output.
Further, when the number of transmit antenna ports is equal to 2, the obtaining, according to the first multi-user multiple-input multiple-output pre-processing matrix, a second multi-user multiple-input multiple-output pre-processing matrix used by the user on the transmit antenna port subset of the second resource includes:
the k user's multi-user multi-input multi-output pre-processing matrix on the n resource is
The precoding matrix of user k on two different resources n and m needs to satisfy the following relation:
substituting the formula (1) into the formula (2) to obtain a multi-user multi-input multi-output preprocessing matrix W of the kth user on the nth resourcek(n)。
Further, when the number of transmit antenna ports is equal to 4, a precoding matrix of user k is obtained using the following formula (3)
Elements of the above matrix
p is 1,2,3,4, which is derived from equations (1) and (2).
Further, the resources include time resources and frequency resources.
An embodiment of the present invention further provides a device for generating a precoding matrix, including:
the device comprises a selection module, a receiving module and a sending module, wherein the selection module is used for selecting a preset number of sending antenna ports from a plurality of sending antenna ports of a sending end to form a sending antenna port subset;
a first calculation module, configured to calculate a first multi-user multiple-input multiple-output pre-processing matrix used by a user on the subset of transmit antenna ports of a first resource;
a second calculation module, configured to obtain, according to the first multi-user multiple-input multiple-output precoding matrix, a second multi-user multiple-input multiple-output precoding matrix used by the user on the transmit antenna port subset of a second resource, where the first multi-user multiple-input multiple-output precoding matrix and the second multi-user multiple-input multiple-output precoding matrix are unitary matrices with each other;
a third calculation module, configured to obtain, according to the first multi-user multiple-input multiple-output pre-processing matrix and the second multi-user multiple-input multiple-output pre-processing matrix, a pre-coding matrix used by the user in a hybrid transmission mode on the multiple transmit antenna ports.
Further, the third calculation module is specifically configured to obtain, according to the first multiuser multiple-input multiple-output preprocessing matrix and the second multiuser multiple-input multiple-output preprocessing matrix, a precoding matrix used by the user in the hybrid transmission mode on the multiple transmit antenna ports by expanding in a unitary matrix manner, where two columns in the precoding matrix correspond to the first resource and the second resource, respectively.
Further, the first calculation module and the second calculation module are specifically configured to obtain a multi-user multiple-input multiple-output preprocessing matrix according to channel calculation; or
And receiving a multi-user multi-input multi-output preprocessing matrix selected from a predefined codebook set by a user according to the scheduling and pairing result of the multi-user multi-input multi-output.
Further, when the number of the transmit antenna ports is equal to 2, the second calculation module is specifically configured to obtain a multi-user multiple-input multiple-output pre-processing matrix W of the kth user on the nth resource by using the following formulak(n)：
The k user's multi-user multi-input multi-output pre-processing matrix on the n resource is
The precoding matrix of user k on two different resources n and m needs to satisfy the following relation:
substituting the formula (1) into the formula (2) to obtain a multi-user multi-input multi-output preprocessing matrix W of the kth user on the nth resourcek(n)。
Further, when the number of transmit antenna ports is equal to 4, the third calculating module is specifically configured to obtain a precoding matrix of user k by using the following formula (3)
Elements of the above matrix
p is 1,2,3,4, which is derived from equations (1) and (2).
Further, the resources include time resources and frequency resources.
The embodiment of the invention also provides a precoding matrix generation device, which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor; the processor, when executing the program, implements the precoding matrix generation method as described above.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the precoding matrix generation method described above.
The embodiment of the invention has the following beneficial effects:
in the above scheme, a preset number of transmit antenna ports are selected from a plurality of transmit antenna ports of a transmit end to form a transmit antenna port subset, a first multi-user multiple-input multiple-output pre-processing matrix used by a user on the transmit antenna port subset of a first resource is calculated, a second multi-user multiple-input multiple-output pre-processing matrix used by the user on the transmit antenna port subset of a second resource is obtained according to the first multi-user multiple-input multiple-output pre-processing matrix, wherein the first multi-user multiple-input multiple-output pre-processing matrix and the second multi-user multiple-input multiple-output pre-processing matrix are unitary matrices, and a pre-coding matrix used by the user in a hybrid transmission mode on the multiple transmit antenna ports is obtained according to the first multi-user multiple-input multiple-output pre-processing matrix and the second multi-user multiple-input multiple-output pre-processing matrix, the pre-processing matrix generated by the technical scheme of the present invention can be applied to a, and higher spectral efficiency performance can be achieved.
Drawings
Fig. 1 is a schematic flowchart of a method for generating a precoding matrix according to an embodiment of the present invention;
FIG. 2 is a system diagram of a transmit diversity and MU-MIMO hybrid transmission scheme according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a precoding matrix generation apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention can provide a precoding matrix generation method and a precoding matrix generation device under the transmission diversity and MU-MIMO mixed transmission mode.
An embodiment of the present invention first provides a method for generating a precoding matrix, as shown in fig. 1, including:
step 101: selecting a preset number of transmitting antenna ports from a plurality of transmitting antenna ports of a transmitting end to form a transmitting antenna port subset;
step 102: calculating a first multi-user multiple-input multiple-output pre-processing matrix used by a user on the subset of transmit antenna ports of a first resource;
step 103: obtaining a second multi-user multi-input multi-output preprocessing matrix used by the user on the transmitting antenna port subset of a second resource according to the first multi-user multi-input multi-output preprocessing matrix, wherein the first multi-user multi-input multi-output preprocessing matrix and the second multi-user multi-input multi-output preprocessing matrix are unitary matrixes with each other;
step 104: and obtaining a precoding matrix used by the user in a hybrid transmission mode on the plurality of sending antenna ports according to the first multi-user multi-input multi-output preprocessing matrix and the second multi-user multi-input multi-output preprocessing matrix.
In this embodiment, a preset number of transmit antenna ports are selected from a plurality of transmit antenna ports of a transmit end to form a transmit antenna port subset, a first multi-user mimo pre-processing matrix used by a user on the transmit antenna port subset of a first resource is calculated, a second multi-user mimo pre-processing matrix used by the user on the transmit antenna port subset of a second resource is obtained according to the first multi-user mimo pre-processing matrix, wherein the first multi-user mimo pre-processing matrix and the second multi-user mimo pre-processing matrix are unitary matrices, and a pre-coding matrix used by the user in a hybrid transmission mode on the plurality of transmit antenna ports is obtained according to the first multi-user mimo pre-processing matrix and the second multi-user mimo pre-processing matrix, a pre-processing matrix generated by the technical scheme of the present invention can be applied to a multi-input multi-output scenario, and higher spectral efficiency performance can be achieved.
Further, the obtaining, according to the first multi-user multiple-input multiple-output preprocessing matrix and the second multi-user multiple-input multiple-output preprocessing matrix, a codebook used by the user in a hybrid transmission mode over the multiple transmit antenna ports includes:
and according to the first multi-user multi-input multi-output preprocessing matrix and the second multi-user multi-input multi-output preprocessing matrix, expanding in a unitary matrix manner to obtain a precoding matrix used by the user in a hybrid transmission mode on the multiple transmitting antenna ports, wherein two columns in the precoding matrix respectively correspond to the first resource and the second resource.
Further, the step of obtaining the multi-user multiple-input multiple-output pre-processing matrix comprises:
obtaining a multi-user multi-input multi-output preprocessing matrix according to channel calculation; or
And receiving a multi-user multi-input multi-output preprocessing matrix selected from a predefined codebook set by a user according to the scheduling and pairing result of the multi-user multi-input multi-output.
The present embodiment proposes a precoding matrix generation scheme under a transmit diversity (SFBC/STBC) and MU-MIMO hybrid transmission scheme. In the hybrid transmission mode, the physical layer processing flow of the sending end and the receiving end of the physical downlink shared channel is as follows:
the flow of the sending end is as follows: each TB block (transport block) is coded, scrambled, modulated, layer mapped, precoded, resource mapped, OFDM (Orthogonal Frequency Division Multiplexing) modulated, mapped to a corresponding antenna port, and transmitted.
The receiving process is the reverse of the above process, namely: OFDM demodulation, resource mapping, channel estimation, equalization, demodulation, descrambling, decoding and recovery.
The specific processing manner of the precoding module in the sending end flow in this embodiment is different from that of the existing MIMO transmission scheme, where the implementation structure of the precoding module is shown in fig. 2. That is, in this embodiment, MU-MIMO spatial multiplexing is performed first, and then transmission diversity (STBC/SFBC) transmission for multiple users is performed. It should be noted that: existing transmit diversity (SFBC/STBC) is for SU-MIMO and there is no multi-user spatial multiplexing and transmit diversity hybrid transmission mode.
The expression of the signal transmitted by the transmitting antenna port in this embodiment can be written as follows:
when the receiving end has Nr1 receiving antenna, the transmitting end has NtWhen there are 2 transmit antenna ports,
is of size Nr×NtUser 1 is located on the MIMO channel on the 1 st resource,
is of size Nr×NtUser 2 is located on the MIMO channel on the 2 nd resource.
Is the channel coefficient between the g-th antenna port of the base station and the user k on the n-th resource.
Is and channel
The coefficients in the corresponding pre-processing matrix. Wk(N) denotes that user k is on the nth resource with size NtA precoding matrix of x 1.
Representing user 1 reception on resource 1 and resource 2, respectivelySignal, s1And s2Respectively representing the 1 st and 2 nd users' transmitted signals without MIMO precoding, z1Representing complex Gaussian noise, gamma, at the receiving end of the 1 st user1And gamma2Respectively representing the transmit power of the 1 st and 2 nd users.
The MIMO codebook generation method corresponding to the hybrid transmission mode is: first, from NtSelection among transmission antennas
An antenna. Secondly, calculate this
MU-MIMO preprocessing matrix W used by k user on n resource on each antennakAnd (n), the preprocessing matrix can be obtained by channel calculation, or by selecting a user from a predefined codebook set and feeding back the user to the base station side according to the scheduling and pairing result of multi-user MIMO. Thirdly, according to the obtained nth resource of the kth user
MU-MIMO preprocessing matrix on each antenna to obtain the m-th resource of the user
MU-MIMO pre-processing matrix W on individual antennask(m) of the reaction mixture. Wherein Wk(n) and Wk(m) it is necessary to satisfy: are unitary matrix relationships to each other. Finally, the m and n resources are determined according to the k
Preprocessing matrix W on each antennak(n) and Wk(m) spreading the k user in N according to the unitary matrix modetCodebook for use in hybrid transmission mode on individual antennas
The unitary matrix is expanded in the manner: by zero padding, from
Preprocessing matrix W on each antennak(n) and Wk(m) respectively obtaining NtPre-processing matrix on each antenna
And
and make it possible to
And
the column/row vectors in (1) still satisfy the orthogonality of the vectors in the complex field.
In order to reduce the complexity of the MIMO detection of the receiver, it is required to ensure that the preprocessing matrix at the transmitting end of SFBC/STBC is a unitary matrix (orthogonal matrix in the complex field). Therefore, for the case of 2 antenna ports, the precoding matrix of user k on two different resources (time or frequency resources) n and m needs to satisfy the following relationship:
for the case that the number of the antenna ports is larger than or equal to 2, the SFBC + FSTD or STBC + TSTD mode is adopted to be obtained by expanding the case of 2 antenna ports, such as: when the number of antenna ports is equal to 4, the precoding matrix of user k can be represented as follows:
the other antennas are counted, and the description is omitted.
It should be noted that: elements of the above matrix
The calculation method of (2) is the same as that in the existing MU-MIMO, such as: BD-SVD (Block diagonalization signalling value decomposition), or an MU-MIMO pre-processing matrix generated offline according to certain criteria. Obtaining the MU-MIMO preprocessing matrix of the kth user on the nth resource
The spreading method from 2 antennas to 4 antennas, even 2N (N is greater than 2) antennas is not unique, for example, taking 4 antennas as an example, a matrix obtained by interchanging any two columns in the matrix (3) can be a precoding matrix of 4 antennas (still being a unitary matrix, i.e. any two columns or two rows of the matrix are orthogonal in the complex field). Such as:
and the like.
Based on the 2-antenna preprocessing matrix, the precoding matrix of 4 antennas is expanded in a unitary matrix manner, and then the "first resource" and the "second resource" in the 2 antennas correspond to two columns in the expanded precoding matrix of 4 antennas.
An embodiment of the present invention further provides a precoding matrix generation apparatus, as shown in fig. 3, including:
a selecting module 21, configured to select a preset number of transmitting antenna ports from multiple transmitting antenna ports at a transmitting end to form a transmitting antenna port subset;
a first calculation module 22, configured to calculate a first multi-user multiple-input multiple-output pre-processing matrix used by users on the transmit antenna port subset of the first resource;
a second calculating module 23, configured to obtain a second multi-user multiple-input multiple-output pre-processing matrix used by the user on the transmit antenna port subset of a second resource according to the first multi-user multiple-input multiple-output pre-processing matrix, where the first multi-user multiple-input multiple-output pre-processing matrix and the second multi-user multiple-input multiple-output pre-processing matrix are unitary matrices with each other;
a third calculating module 24, configured to obtain, according to the first multi-user multiple-input multiple-output preprocessing matrix and the second multi-user multiple-input multiple-output preprocessing matrix, a precoding matrix used by the user in a hybrid transmission mode on the multiple transmit antenna ports.
In this embodiment, a preset number of transmit antenna ports are selected from a plurality of transmit antenna ports of a transmit end to form a transmit antenna port subset, a first multi-user mimo pre-processing matrix used by a user on the transmit antenna port subset of a first resource is calculated, a second multi-user mimo pre-processing matrix used by the user on the transmit antenna port subset of a second resource is obtained according to the first multi-user mimo pre-processing matrix, wherein the first multi-user mimo pre-processing matrix and the second multi-user mimo pre-processing matrix are unitary matrices, and a pre-coding matrix used by the user in a hybrid transmission mode on the plurality of transmit antenna ports is obtained according to the first multi-user mimo pre-processing matrix and the second multi-user mimo pre-processing matrix, a pre-processing matrix generated by the technical scheme of the present invention can be applied to a multi-input multi-output scenario, and higher spectral efficiency performance can be achieved.
Further, the third calculating module 24 is specifically configured to obtain, according to the first multiuser multiple-input multiple-output preprocessing matrix and the second multiuser multiple-input multiple-output preprocessing matrix, a precoding matrix used by the user in the hybrid transmission mode on the multiple transmit antenna ports by expanding in a unitary matrix manner, where two columns in the precoding matrix correspond to the first resource and the second resource, respectively.
Further, the first calculating module 22 and the second calculating module 23 are specifically configured to obtain a multi-user multiple-input multiple-output preprocessing matrix according to channel calculation; or
And receiving a multi-user multi-input multi-output preprocessing matrix selected from a predefined codebook set by a user according to the scheduling and pairing result of the multi-user multi-input multi-output.
Further, when the number of the transmit antenna ports is equal to 2, the second calculating module 23 is specifically configured to obtain a multi-user multiple-input multiple-output preprocessing matrix W of the kth user on the nth resource by using the following formulak(n)：
The k user's multi-user multi-input multi-output pre-processing matrix on the n resource is
The precoding matrix of user k on two different resources n and m needs to satisfy the following relation:
substituting the formula (1) into the formula (2) to obtain a multi-user multi-input multi-output preprocessing matrix W of the kth user on the nth resourcek(n)。
Further, when the number of transmit antenna ports is equal to 4, the third calculating module 24 is specifically configured to obtain a precoding matrix of user k by using the following formula (3)
Elements of the above matrix
p is 1,2,3,4, which is derived from equations (1) and (2).
Further, the resources include time resources and frequency resources.
The embodiment of the invention also provides a precoding matrix generation device, which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor; the processor, when executing the program, implements the precoding matrix generation method as described above.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the precoding matrix generation method described above.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (14)
1. A method for generating a precoding matrix, comprising:
selecting a preset number of transmitting antenna ports from a plurality of transmitting antenna ports of a transmitting end to form a transmitting antenna port subset;
calculating a first multi-user multiple-input multiple-output pre-processing matrix used by a user on the subset of transmit antenna ports of a first resource;
obtaining a second multi-user multi-input multi-output preprocessing matrix used by the user on the transmitting antenna port subset of a second resource according to the first multi-user multi-input multi-output preprocessing matrix, wherein the first multi-user multi-input multi-output preprocessing matrix and the second multi-user multi-input multi-output preprocessing matrix are unitary matrixes with each other;
and obtaining a precoding matrix used by the user in a hybrid transmission mode on the plurality of transmitting antenna ports according to the first multi-user multi-input multi-output preprocessing matrix and the second multi-user multi-input multi-output preprocessing matrix, wherein two columns in the precoding matrix respectively correspond to the first resource and the second resource.
2. The method of claim 1, wherein the obtaining the codebook used by the user in the hybrid transmission mode on the multiple transmit antenna ports according to the first mu-mimo pre-processing matrix and the second mu-mimo pre-processing matrix comprises:
and according to the first multi-user multi-input multi-output preprocessing matrix and the second multi-user multi-input multi-output preprocessing matrix, expanding in a unitary matrix manner to obtain a precoding matrix used by the user in a hybrid transmission mode on the plurality of transmitting antenna ports.
3. The precoding matrix generation method of claim 2, wherein the step of obtaining the multi-user multiple-input multiple-output precoding matrix comprises:
obtaining a multi-user multi-input multi-output preprocessing matrix according to channel calculation; or
And receiving a multi-user multi-input multi-output preprocessing matrix selected from a predefined codebook set by a user according to the scheduling and pairing result of the multi-user multi-input multi-output.
4. The method of claim 2, wherein obtaining a second mu mimo pre-processing matrix used by the user on the subset of transmit antenna ports of a second resource according to the first mu mimo pre-processing matrix when the number of transmit antenna ports is equal to 2 comprises:
the k user's multi-user multi-input multi-output pre-processing matrix on the n resource is
The precoding matrix of user k on two different resources n and m needs to satisfy the following relation:
substituting the formula (1) into the formula (2) to obtain a multi-user multi-input multi-output preprocessing matrix W of the kth user on the nth resourcek(n), elements of the matrix
Where p corresponds to the transmit antenna port, and p is 1, 2.
5. The precoding matrix generation method of claim 4, wherein the number of the transmit antenna ports is equal toAt time 4, the precoding matrix of user k is obtained by using the following formula (3)
Elements of the above matrix
p is 1,2,3,4, which is derived from equations (1) and (2).
6. The method of generating precoding matrix of claim 1, wherein the resource comprises a time resource and a frequency resource.
7. An apparatus for generating a precoding matrix, comprising:
the device comprises a selection module, a receiving module and a sending module, wherein the selection module is used for selecting a preset number of sending antenna ports from a plurality of sending antenna ports of a sending end to form a sending antenna port subset;
a first calculation module, configured to calculate a first multi-user multiple-input multiple-output pre-processing matrix used by a user on the subset of transmit antenna ports of a first resource;
a second calculation module, configured to obtain, according to the first multi-user multiple-input multiple-output precoding matrix, a second multi-user multiple-input multiple-output precoding matrix used by the user on the transmit antenna port subset of a second resource, where the first multi-user multiple-input multiple-output precoding matrix and the second multi-user multiple-input multiple-output precoding matrix are unitary matrices with each other;
a third calculation module, configured to obtain, according to the first multi-user multiple-input multiple-output pre-processing matrix and the second multi-user multiple-input multiple-output pre-processing matrix, a pre-coding matrix used by the user in a hybrid transmission mode on the multiple transmit antenna ports, where two columns in the pre-coding matrix correspond to the first resource and the second resource, respectively.
8. The precoding matrix generation apparatus of claim 7,
the third calculation module is specifically configured to obtain, according to the first multi-user multiple-input multiple-output pre-processing matrix and the second multi-user multiple-input multiple-output pre-processing matrix, a pre-coding matrix used by the user in a hybrid transmission mode on the multiple transmit antenna ports by expanding in a unitary matrix manner.
9. The precoding matrix generation apparatus of claim 8,
the first calculation module and the second calculation module are specifically used for obtaining a multi-user multi-input multi-output preprocessing matrix according to channel calculation; or
And receiving a multi-user multi-input multi-output preprocessing matrix selected from a predefined codebook set by a user according to the scheduling and pairing result of the multi-user multi-input multi-output.
10. The apparatus according to claim 8, wherein when the number of transmit antenna ports is equal to 2, the second computing module is specifically configured to obtain a multi-user multiple-input multiple-output pre-processing matrix W for the kth user on the nth resource by using the following formulak(n)：
The k user's multi-user multi-input multi-output pre-processing matrix on the n resource is
The precoding matrix of user k on two different resources n and m needs to satisfy the following relation:
substituting the formula (1) into the formula (2) to obtain a multi-user multi-input multi-output preprocessing matrix W of the kth user on the nth resourcek(n), elements of the matrix
Where p corresponds to the transmit antenna port, and p is 1, 2.
11. The apparatus according to claim 10, wherein when the number of transmit antenna ports is equal to 4, the third calculating module is specifically configured to obtain the precoding matrix of user k by using the following formula (3)
Elements of the above matrix
p is 1,2,3,4, which is derived from equations (1) and (2).
12. The apparatus of claim 7, wherein the resources comprise time resources and frequency resources.
13. A precoding matrix generation apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor; characterized in that the processor implements the precoding matrix generation method of any of claims 1 to 6 when executing the program.
14. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method for generating a precoding matrix as defined in any one of claims 1 to 6.
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| CN103220024A (en) * | 2013-04-18 | 2013-07-24 | 电子科技大学 | Beam forming algorithm of multi-user pairing virtual multi-input multi-output (MIMO) system |
| CN103731190A (en) * | 2012-10-16 | 2014-04-16 | 华为技术有限公司 | Signal transmission method, base station and system of multi-user and multiple-input-multiple-output system |
| CN103840870A (en) * | 2013-12-31 | 2014-06-04 | 重庆邮电大学 | Method for lowering limiting feedback expenditure of 3D MIMO channel |
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| US9923666B2 (en) * | 2014-10-01 | 2018-03-20 | Qualcomm, Incorporated | Encoding in uplink multi-user MIMO and OFDMA transmissions |
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| CN103051432A (en) * | 2013-01-24 | 2013-04-17 | 河南理工大学 | Method for eliminating multiuser interference inside X channel |
| CN103220024A (en) * | 2013-04-18 | 2013-07-24 | 电子科技大学 | Beam forming algorithm of multi-user pairing virtual multi-input multi-output (MIMO) system |
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