CN114726420A - Precoding method, information determining method and device - Google Patents
Precoding method, information determining method and device Download PDFInfo
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- 239000004744 fabric Substances 0.000 claims description 8
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- 238000003491 array Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
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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
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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
- H04B7/06—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
- H04B7/0615—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 of weighted versions of same signal
- H04B7/0619—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 of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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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
- H04B7/06—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
- H04B7/0615—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 of weighted versions of same signal
- H04B7/0619—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 of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a precoding method, an information determining method and a device, wherein the method comprises the following steps: selecting a first antenna from the antennas of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of uniform linear array precoding codebooks specified in advance; and transmitting the CSI-RS signal to the terminal by using the first antenna. According to the invention, the sparse linear array can achieve the beam pointing equivalent to a uniform linear array directional diagram by multiplexing the precoding codebook of the uniform linear array defined by the existing standard.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a precoding method, an information determining method, and an apparatus.
Background
The design of a large-scale antenna of the fifth generation mobile communication technology (5G) reaches 192 arrays and 64 channels at low frequency, and reaches the maximum specification of commercial deployment in the aspects of windward side, volume, weight, power consumption and the like; particularly in a high-frequency band, due to the small distance between the antennas in the high-frequency band, the number of antenna arrays which can be supported under the same deployment specification is more. The development of the future ultra-large-scale antenna is oriented, the optimal design of the array is considered no matter the low frequency or the high frequency, and the dilute array is adopted to reduce the cost of the whole antenna and improve the system performance, so that the development of the ultra-large-scale antenna becomes one of the research directions of the evolution of the ultra-large-scale antenna.
When a mobile communication system adopts a sparse array and considers a Precoding scheme based on a codebook, because the prior art only supports a uniform array Precoding codebook with a specific antenna number (power of 2) and does not support a Precoding codebook corresponding to the sparse array, when the system adopts the sparse array for data transmission, a terminal (UE) cannot feed back Precoding Matrix Indicator (PMI) information based on the sparse array antenna number specification to a Base Station (BS). In addition, the number of antennas and the distance between the antennas of the sparse array are related to an application scene and a sparse integration algorithm, so that the array form of the sparse array in the future is diversified, and the standardization difficulty of the sparse array precoding codebook is high.
Disclosure of Invention
The embodiment of the invention provides a precoding method, an information determining method and an information determining device, which are used for solving the problems that the prior art only supports a uniform array precoding codebook with a specific antenna number and does not support a precoding codebook corresponding to a sparse array.
In order to solve the above problems, the present invention is realized by:
in a first aspect, an embodiment of the present invention provides a precoding method, which is applied to a network side device, where the network side device includes a sparsely-distributed linear array antenna, and includes:
selecting a first antenna from the antennas of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of uniform linear array precoding codebooks specified in advance;
and transmitting a CSI-RS signal to a terminal by using the first antenna.
Optionally, after the sending the CSI-RS signal to the terminal by using the first antenna, the method further includes:
receiving first precoding matrix indication information of the sparse linear array sent by the terminal, wherein the first precoding matrix indication information is determined by the terminal according to second precoding matrix indication information which is determined according to the CSI-RS signal;
determining a precoding matrix of the sparse linear array according to the first precoding matrix indication information; and precoding the information to be transmitted by adopting the precoding matrix.
Optionally, the first antenna rows are uniform or symmetrical or discontinuous.
Optionally, the number of the first antennas is an antenna number which is not greater than the total number of antennas of the sparse linear array and is closest to the total number of antennas of the sparse linear array, among the antenna numbers corresponding to the predefined multiple uniform linear array precoding codebooks.
Optionally, before receiving the first precoding matrix indication information of the sparse linear array sent by the terminal, the method further includes:
sending first information to the terminal, wherein the first information comprises the number of antennas of a first uniform linear array and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same caliber as that of the thin cloth linear array, and the distribution position of the second antenna corresponds to that of the first antenna.
In a second aspect, an embodiment of the present invention provides an information determining method, applied to a terminal, including:
receiving a CSI-RS signal sent by network side equipment, wherein the network side equipment comprises an antenna of a sparse linear array, and the CSI-RS signal is sent by the network side equipment by using a first antenna selected from the antenna of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of predetermined uniform linear array precoding codebooks.
Optionally, after receiving the CSI-RS signal sent by the network side device, the method further includes:
determining second precoding matrix indication information according to the CSI-RS signal;
determining first precoding matrix indication information of the sparse linear array according to the second precoding matrix indication information;
and sending the first precoding matrix indication information to the network side equipment.
Optionally, the determining second precoding matrix indication information according to the CSI-RS signal includes:
estimating a downlink channel according to the CSI-RS signal, and calculating downlink channel matrix observed quantity;
obtaining a second precoding matrix according to the downlink channel matrix observed quantity;
and determining the second precoding matrix indication information according to the second precoding matrix.
Optionally, the obtaining a second precoding matrix according to the downlink channel matrix observed quantity includes:
and calculating to obtain the second precoding matrix based on a first codebook according to a channel capacity maximization criterion, wherein the first codebook is a codebook corresponding to a second uniform linear array, and the number of the antennas of the second uniform linear array is equal to that of the first antennas.
Optionally, the determining, according to the second precoding matrix indication information, first precoding matrix indication information of the sparse linear array includes:
determining the first precoding matrix indication information according to the second precoding matrix indication information, the number of antennas of a first uniform linear array and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same caliber as that of the thin cloth linear array, and the distribution position of the second antenna corresponds to that of the first antenna.
Optionally, before determining the first precoding matrix indication information according to the second precoding matrix indication information, the number of antennas of the first uniform linear array, and the number of second antennas in the first uniform linear array, the method further includes:
and receiving first information sent by the network side equipment, wherein the first information comprises the number of the antennas in the first uniform linear array and the number of the second antennas in the first uniform linear array.
In a third aspect, an embodiment of the present invention provides a network-side device, where the network-side device includes an antenna with a sparse linear array, and includes:
the first selection module is used for selecting a first antenna from the antennas of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of uniform linear array precoding codebooks specified in advance;
and the first sending module is used for sending the CSI-RS signal to the terminal by using the first antenna.
Optionally, the network side device further includes:
a first receiving module, configured to receive first precoding matrix indication information of the sparse linear array sent by the terminal, where the first precoding matrix indication information is determined by the terminal according to second precoding matrix indication information, and the second precoding matrix indication information is determined according to the CSI-RS signal;
the first processing module is used for determining a precoding matrix of the sparse linear array according to the first precoding matrix indication information;
and the precoding module is used for precoding the information to be transmitted by adopting the precoding matrix.
Optionally, the network side device further includes:
the second sending module is used for sending first information to the terminal, wherein the first information comprises the number of antennas of the first uniform linear array and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same caliber as that of the thin cloth linear array, and the distribution position of the second antenna corresponds to that of the first antenna.
In a fourth aspect, an embodiment of the present invention provides a terminal, including:
the second receiving module is used for receiving a CSI-RS signal sent by network side equipment, the network side equipment comprises sparse linear array antennas, and the CSI-RS signal is sent by the network side equipment by using a first antenna selected from the sparse linear array antennas; the number of the first antennas is selected from the number of antennas corresponding to a plurality of predetermined uniform linear array precoding codebooks.
Optionally, the terminal further includes:
a second processing module, configured to determine second precoding matrix indication information according to the CSI-RS signal; the third processing module is used for determining the first precoding matrix indication information of the sparse linear array according to the second precoding matrix indication information;
and a third sending module, configured to send the first precoding matrix indicator to the network side device.
Optionally, the second processing module includes:
the downlink channel estimation submodule is used for performing downlink channel estimation according to the CSI-RS signal and calculating downlink channel matrix observed quantity;
the first determining submodule is used for obtaining a second precoding matrix according to the downlink channel matrix observed quantity;
and the second determining submodule is used for determining the second precoding matrix indication information according to the second precoding matrix.
Optionally, the first determining submodule is configured to calculate, according to a channel capacity maximization criterion, the second precoding matrix based on a first codebook, where the first codebook is a codebook corresponding to a second uniform linear array, and the number of antennas of the second uniform linear array is equal to the number of antennas of the first antenna.
Optionally, the third processing module includes:
the first processing submodule is used for determining the first precoding matrix indication information according to the second precoding matrix indication information, the number of the antennas of the first uniform linear array and the number of the second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same caliber as that of the thin cloth linear array, and the distribution position of the second antenna corresponds to that of the first antenna.
Optionally, the terminal further includes:
and a third receiving module, configured to receive first information sent by the network side device, where the first information includes the number of antennas in the first uniform linear array and the number of second antennas in the first uniform linear array.
In a fifth aspect, an embodiment of the present invention provides a network-side device, where the network-side device includes an antenna with a sparse linear array, and the network-side device includes: a transceiver and a processor;
the processor is used for selecting a first antenna from the antennas of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of uniform linear array precoding codebooks specified in advance;
the transceiver is used for transmitting a CSI-RS signal to a terminal by using the first antenna.
Optionally, the network side device further includes:
the transceiver is configured to receive first precoding matrix indication information of the sparse linear array sent by the terminal, where the first precoding matrix indication information is determined by the terminal according to second precoding matrix indication information, and the second precoding matrix indication information is determined according to the CSI-RS signal;
the processor is configured to determine a precoding matrix of the sparse linear array according to the first precoding matrix indication information;
the processor is configured to precode information to be transmitted by using the precoding matrix.
Optionally, the network side device further includes:
the transceiver is configured to send first information to the terminal, where the first information includes the number of antennas in a first uniform linear array and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same caliber as that of the sparse linear array, and the distribution position of the second antenna corresponds to that of the first antenna.
In a sixth aspect, an embodiment of the present invention provides a terminal, including: a transceiver and a processor;
the transceiver is used for receiving a CSI-RS signal sent by network side equipment, the network side equipment comprises an antenna of a sparse linear array, and the CSI-RS signal is sent by the network side equipment by using a first antenna selected from the antenna of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of predetermined uniform linear array precoding codebooks.
Optionally, the terminal further includes:
the processor is configured to determine second precoding matrix indication information according to the CSI-RS signal; the processor is configured to determine first precoding matrix indication information of the sparse linear array according to the second precoding matrix indication information;
the transceiver is configured to send the first precoding matrix indicator to the network side device.
Optionally, the processor is configured to perform downlink channel estimation according to the CSI-RS signal, and calculate a downlink channel matrix observed quantity; obtaining a second pre-coding matrix according to the downlink channel matrix observed quantity; and determining the second precoding matrix indication information according to the second precoding matrix.
Optionally, the processor is configured to calculate, according to a channel capacity maximization criterion, the second precoding matrix based on a first codebook, where the first codebook is a codebook corresponding to a second uniform linear array, and the number of antennas of the second uniform linear array is equal to the number of antennas of the first antenna.
Optionally, the processor is configured to determine the first precoding matrix indication information according to the second precoding matrix indication information, the number of antennas of the first uniform linear array, and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same caliber as that of the thin cloth linear array, and the distribution position of the second antenna corresponds to that of the first antenna.
Optionally, the processor is configured to receive first information sent by the network side device, where the first information includes the number of antennas in the first uniform linear array and the number of second antennas in the first uniform linear array.
In a seventh aspect, an embodiment of the present invention provides a network-side device, where the network-side device includes: a processor, a memory and a program stored on the memory and executable on the processor, which program, when executed by the processor, carries out the steps of the pre-coding method as set forth in the first aspect.
In an eighth aspect, an embodiment of the present invention provides a terminal, where the terminal includes: a processor, a memory and a program stored on the memory and executable on the processor, which program, when executed by the processor, carries out the steps of the information determination method according to the second aspect.
In a ninth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and the computer program, when executed by a processor, implements the precoding method according to the first aspect or implements the steps of the information determination method according to the second aspect.
The precoding scheme for the sparse linear array provided by the embodiment of the invention can be generally suitable for the sparse arrays with various antenna position distributions and/or numbers. Moreover, a precoding codebook does not need to be specified in advance for the sparse array with diversified forms, and the precoding matrix of the sparse array can be determined based on the existing codebook.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flowchart of a precoding method applied to a network side device according to an embodiment of the present invention;
fig. 2 is a schematic view of an application scenario of a precoding method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a uniform linear array and a sparse linear array according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a continuously selected centrosymmetric antenna according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a non-continuously selected antenna according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of an information determining method according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a uniform linear array and a sparse linear array directional diagram according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a directional diagram of another uniform linear array and a sparse linear array provided by an embodiment of the present invention;
fig. 9 is a schematic flowchart of an implementation of a precoding method according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a network-side device according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of another network-side device according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of another terminal according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of another network-side device according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a precoding method, applied to a network side device, where the network side device includes a sparsely-distributed linear array antenna, and includes:
step 11: selecting first antennas from the antennas of the sparse linear array, wherein the number of the first antennas is not more than the total number of the antennas in the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of uniform linear array precoding codebooks specified in advance; the antenna is also an array element;
the sparse linear array is an array directional diagram which is close to a uniform linear array of N antennas and is realized by using M antennas, wherein M is smaller than N, the spacing d of the antennas is lambda/2, and the antenna spacing between adjacent antennas of the sparse linear array is not constrained by the condition that d is not more than lambda/2 and can be unequal. Therefore, the sparse linear array uses a smaller number of antennas than the uniform linear array, and reduces the mutual coupling effect between the antennas. In the existing mobile communication system, N is generally a power of 2, and the number of the sparse linear array antennas obtained by different sparse array integrated algorithms is mostly not the power of 2; the original uniform linear array is replaced by the thin cloth linear array, so that the number of antennas is reduced, and the cost is reduced;
step 12: and transmitting a CSI-RS signal to a terminal by using the first antenna.
The precoding scheme for the sparse linear array provided by the embodiment of the invention can be universally applied to the sparse arrays with various antenna position distributions and/or quantities; moreover, a precoding codebook does not need to be specified in advance for the sparse array with diversified forms, and the precoding matrix of the sparse array can be determined based on the existing codebook.
In step 11 of the present invention, referring to fig. 2, the number N2 of the first antennas is not greater than the total number M of antennas in the sparse linear array, and the number N2 of the first antennas is the maximum number of antennas, which is smaller than the total number M of antennas in the sparse linear array, in the number of uniform linear array antennas supported by the prior art.
In the embodiment of the present invention, optionally, first precoding matrix indication information of the sparse linear array sent by the terminal is received, where the first precoding matrix indication information is determined by the terminal according to second precoding matrix indication information, and the second precoding matrix indication information is determined according to the CSI-RS signal;
determining a precoding matrix of the sparse linear array according to the first precoding matrix indication information;
and precoding information to be transmitted by adopting the precoding matrix.
In the embodiment of the present invention, the receiving terminal receives first precoding matrix indicator PMI _ M of the sparse linear array sent by the terminal, where the first precoding matrix indicator is determined by the terminal according to second precoding matrix indicator PMI, and the second precoding matrix indicator is determined by the terminal according to the CSI-RS signal; the information to be transmitted comprises a Demodulation Reference Signal (DMRS) and data d to be transmitted, and the data d to be transmitted is encoded by adopting a vector Sq in a sparse linear array precoding matrix, wherein the actual transmission data d' is Sqxd.
In the embodiment of the invention, after the information to be transmitted is precoded by adopting the precoding matrix, all the antennae of the sparse linear array are adopted to send the precoded information to be transmitted to the terminal.
In the embodiment of the present invention, optionally, the first antennas are arranged uniformly or symmetrically or discontinuously.
Specifically, when the first antenna is selected from the antennas of the sparse linear array, the method of selecting the number N2 of the first antennas includes, but is not limited to, selecting more uniformly symmetric elements in the sparse linear array, for example, referring to fig. 3, N2 centrosymmetric antennas are selected in succession, or referring to fig. 4, N2 antennas are selected in a non-continuous manner.
In this embodiment of the present invention, optionally, the number of the first antennas is an antenna number that is not greater than the total number of antennas of the sparse linear array and is closest to the total number of antennas of the sparse linear array, among the number of antennas corresponding to the predefined multiple uniform linear array precoding codebooks.
In the embodiment of the present invention, if the total number M of antennas of the sparse linear array is 21, the number of antennas corresponding to the predetermined plurality of uniform linear array precoding codebooks is determined, and the number of antennas closest to the total number 21 of antennas of the sparse linear array is 16, so that the number of the first antennas is selected to be 16.
In this embodiment of the present invention, the number N2 of the first antennas is the maximum number of antennas, which is smaller than the total number M of antennas in the sparse linear array, among the number of uniform linear array antennas supported by the prior art.
In this embodiment of the present invention, optionally, before the receiving the first precoding matrix indicator of the sparse linear array sent by the terminal, the method further includes:
sending first information to the terminal, wherein the first information comprises the number of antennas of a first uniform linear array and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same aperture as the sparse linear array, the distribution position of the second antenna corresponds to the distribution position of the first antenna, or the second antenna comprises a third antenna in the first uniform linear array and an antenna in the first uniform linear array before the third antenna is arranged, and the position of the third antenna corresponds to the position of the last antenna arranged in the sparse linear array.
Referring to fig. 5, in the embodiment of the present invention, taking the number N1 of uniform linear array antennas as an example, 32, after the sparse integration, the total number M of the sparse linear array antennas is 21. Currently, the codebook specification is smaller than that of a sparse linear array and defined by the prior art is a 16 uniform array, so that when the sparse linear array transmits a pilot signal, the number N2 of first antennas is selected to be 16 for transmission; supposing that the front 16 antennas are selected to transmit when the antennas are selected, because the position distribution of the Nth 2 antenna in the sparse array is close to the position of the 24 th antenna in the uniform linear array of 32 antennas; and if the selected antenna is selected discontinuously or is selected as the first 16 antennas, the antenna with the closest position in the uniform linear array is correspondingly corresponded.
In the embodiment of the invention, the sparse linear array can achieve the beam direction equivalent to the directional diagram of the uniform linear array by multiplexing the precoding codebook of the uniform linear array defined by the existing standard, and the transmission of the precoding codebook of the uniform linear array defined by the existing standard is realized.
Referring to fig. 6, an embodiment of the present invention provides an information determining method, applied to a terminal, including:
step 61: receiving a CSI-RS signal sent by network side equipment, wherein the network side equipment comprises an antenna of a sparse linear array, and the CSI-RS signal is sent by the network side equipment by using a first antenna selected from the antenna of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of predetermined uniform linear array precoding codebooks.
The precoding scheme for the sparse linear array provided by the embodiment of the invention can be universally applied to the sparse arrays with various antenna position distributions and/or numbers; moreover, a precoding codebook does not need to be specified in advance for the sparse array with diversified forms, and the precoding matrix of the sparse array can be determined based on the existing codebook.
In this embodiment of the present invention, optionally, after receiving the CSI-RS signal sent by the network side device, the method further includes:
determining second precoding matrix indication information according to the CSI-RS signal;
determining first precoding matrix indication information of the sparse linear array according to the second precoding matrix indication information;
and sending the first precoding matrix indication information to the network side equipment.
In the embodiment of the invention, the terminal carries out downlink channel estimation according to the received CSI-RS signal and calculates the downlink channel matrix observed quantity
According to the downlink channel matrix observed quantity
A second precoding matrix Qj is obtained, wherein,
in the formula, PIFor interference power, NnoiseIs the noise power; determining the second precoding matrix indication information PMI as p according to the second precoding matrix Qj; determining first precoding matrix indication information PMI _ M of the sparse linear array according to the second precoding matrix indication information p, wherein PMI _ M is q,
wherein, N1 is the number of uniform linear array antennas, T uniform linear array selects the number of antennas corresponding to uniform linear array when N2 antennas.
In this embodiment of the present invention, optionally, the determining the second precoding matrix indication information according to the CSI-RS signal includes:
estimating a downlink channel according to the CSI-RS signal, and calculating a downlink channel matrix observed quantity
According to the downlink channel matrix observed quantity
Obtaining a second pre-coding matrix Qj;
and determining the second precoding matrix indication information PMI according to the second precoding matrix Qj.
In this embodiment of the present invention, optionally, the obtaining a second precoding matrix according to the downlink channel matrix observed quantity includes:
and calculating to obtain the second precoding matrix based on a first codebook according to a channel capacity maximization criterion, wherein the first codebook is a codebook corresponding to a second uniform linear array, and the number of the antennas of the second uniform linear array is equal to that of the first antennas.
In this embodiment of the present invention, optionally, the determining, according to the second precoding matrix indication information, first precoding matrix indication information of the sparse linear array includes:
determining the first precoding matrix indication information according to the second precoding matrix indication information, the number of antennas of a first uniform linear array and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same aperture as the sparse linear array, the distribution position of the second antenna corresponds to the distribution position of the first antenna, or the second antenna comprises a third antenna in the first uniform linear array and an antenna in the first uniform linear array before the third antenna is arranged, and the position of the third antenna corresponds to the position of the last antenna arranged in the sparse linear array.
In this embodiment of the present invention, optionally, before determining the first precoding matrix indicator according to the second precoding matrix indicator, the number of antennas of the first uniform linear array, and the number of second antennas in the first uniform linear array, the method further includes:
and receiving first information sent by the network side equipment, wherein the first information comprises the number of the antennas in the first uniform linear array and the number of the second antennas in the first uniform linear array.
Referring to fig. 7 and 8, in the embodiment of the present invention, the terminal feeds back the PMI indicator p equal to 0 as an example
If the current PMI _ M indication value q is obtained as 0, the beam direction points to the array axis direction at this time, as shown in fig. 7, after the sparse linear array adopts precoding, the expected beam direction can be achieved, and the sparse linear array is basically matched with a 32-uniform linear array directional diagram; taking the terminal feedback PMI indication value p as an example, obtaining the current PMI _ M indication value q as 8, and at this time, the beam direction points to the direction around-7 °, as shown in fig. 8, after the sparse linear array adopts precoding, the expected beam direction can be achieved, and the sparse linear array is basically matched with a 32 uniform linear array directional diagram.
In the embodiment of the invention, the sparse linear array can achieve the beam pointing equivalent to a uniform linear array directional diagram by multiplexing the pre-coding codebook of the uniform linear array defined by the existing standard.
Referring to fig. 9, in the embodiment of the present invention, a network side device BS sends a CSI-RS signal to a terminal UE by using the first antenna; the terminal determines second precoding matrix indication information according to the CSI-RS signal; determining first precoding matrix indication information PMI _ M of the sparse linear array according to the second precoding matrix indication information; sending the first precoding matrix indication information PMI _ M to the network side equipment; and the network side equipment carries out precoding on information to be transmitted by adopting the precoding matrix.
In the embodiment of the invention, the sparse linear array can achieve the beam direction equivalent to the directional diagram of the uniform linear array by multiplexing the precoding codebook of the uniform linear array defined by the existing standard, and the transmission of the precoding codebook of the uniform linear array defined by the existing standard is realized.
Referring to fig. 10, an embodiment of the present invention provides a network-side device, where the network-side device includes a sparse linear array antenna, and the network-side device includes:
a first selection module 101, configured to select a first antenna from the antennas of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of uniform linear array precoding codebooks specified in advance;
a first sending module 102, configured to send a CSI-RS signal to a terminal by using the first antenna.
In this embodiment of the present invention, optionally, the network side device further includes:
a first receiving module, configured to receive first precoding matrix indication information of the sparse linear array sent by the terminal, where the first precoding matrix indication information is determined by the terminal according to second precoding matrix indication information, and the second precoding matrix indication information is determined according to the CSI-RS signal;
the first processing module is used for determining a precoding matrix of the sparse linear array according to the first precoding matrix indication information;
and the precoding module is used for precoding the information to be transmitted by adopting the precoding matrix.
In this embodiment of the present invention, optionally, the network side device further includes:
the second sending module is used for sending first information to the terminal, wherein the first information comprises the number of antennas of the first uniform linear array and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same aperture as the sparse linear array, the distribution position of the second antenna corresponds to the distribution position of the first antenna, or the second antenna comprises a third antenna in the first uniform linear array and an antenna in the first uniform linear array before the third antenna is arranged, and the position of the third antenna corresponds to the position of the last antenna arranged in the sparse linear array.
The network side device provided in the embodiment of the present invention can implement each process implemented by the precoding method in the method embodiment of fig. 1, and is not described here again to avoid repetition.
Referring to fig. 11, an embodiment of the present invention provides a terminal, including:
a second receiving module 111, configured to receive a CSI-RS signal sent by a network side device, where the network side device includes an antenna of a sparse linear array, and the CSI-RS signal is sent by the network side device using a first antenna selected from the antenna of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of predetermined uniform linear array precoding codebooks.
In this embodiment of the present invention, optionally, the terminal further includes:
a second processing module, configured to determine second precoding matrix indication information according to the CSI-RS signal;
the third processing module is used for determining the first precoding matrix indication information of the sparse linear array according to the second precoding matrix indication information;
and the second sending module is used for sending the first precoding matrix indication information to the network side equipment.
In this embodiment of the present invention, optionally, the second processing module includes:
the downlink channel estimation submodule is used for performing downlink channel estimation according to the CSI-RS signal and calculating downlink channel matrix observed quantity;
the first determining submodule is used for obtaining a second precoding matrix according to the downlink channel matrix observed quantity;
and the second determining submodule is used for determining the second precoding matrix indication information according to the second precoding matrix.
In this embodiment of the present invention, optionally, the first determining submodule is configured to calculate, according to a channel capacity maximization criterion, the second precoding matrix based on a first codebook, where the first codebook is a codebook corresponding to a second uniform linear array, and the number of antennas of the second uniform linear array is equal to the number of antennas of the first antenna.
In this embodiment of the present invention, optionally, the third processing module includes:
the first processing submodule is used for determining the first precoding matrix indication information according to the second precoding matrix indication information, the number of the antennas of the first uniform linear array and the number of the second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same aperture as the sparse linear array, the distribution position of the second antenna corresponds to the distribution position of the first antenna, or the second antenna comprises a third antenna in the first uniform linear array and an antenna in the first uniform linear array before the third antenna is arranged, and the position of the third antenna corresponds to the position of the last antenna arranged in the sparse linear array.
In this embodiment of the present invention, optionally, the terminal further includes:
and the third receiving module is configured to receive first information sent by the network side device, where the first information includes the number of antennas in the first uniform linear array and the number of second antennas in the first uniform linear array.
The network side device provided in the embodiment of the present invention can implement each process implemented by the information determination method in the method embodiment of fig. 6, and is not described here again to avoid repetition.
Referring to fig. 12, an embodiment of the present invention provides a network-side device 120, where the network-side device includes a sparse linear array antenna, and the network-side device includes: a transceiver 121 and a processor 122;
the processor 122 is configured to select a first antenna from the antennas of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of uniform linear array precoding codebooks specified in advance;
the transceiver 121 is configured to transmit a CSI-RS signal to a terminal using the first antenna.
In this embodiment of the present invention, optionally, the network side device further includes:
the transceiver 121 is configured to receive first precoding matrix indication information of the sparse linear array sent by the terminal, where the first precoding matrix indication information is determined by the terminal according to second precoding matrix indication information, and the second precoding matrix indication information is determined according to the CSI-RS signal;
the processor 122 is configured to determine a precoding matrix of the sparse linear array according to the first precoding matrix indication information;
the processor 122 is configured to precode information to be transmitted by using the precoding matrix.
In this embodiment of the present invention, optionally, the network side device further includes:
the transceiver 121 is configured to send first information to the terminal, where the first information includes the number of antennas in a first uniform linear array and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same aperture as the sparse linear array, the distribution position of the second antenna corresponds to the distribution position of the first antenna, or the second antenna comprises a third antenna in the first uniform linear array and an antenna in the first uniform linear array before the third antenna is arranged, and the position of the third antenna corresponds to the position of the last antenna arranged in the sparse linear array.
Referring to fig. 13, an embodiment of the present invention provides a terminal 130, including: a transceiver 131 and a processor 132;
the transceiver 131 is configured to receive a CSI-RS signal sent by a network side device, where the network side device includes an antenna of a sparse linear array, and the CSI-RS signal is sent by the network side device by using a first antenna selected from the antenna of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of predetermined uniform linear array precoding codebooks.
In this embodiment of the present invention, optionally, the terminal further includes:
the processor 132 is configured to determine second precoding matrix indication information according to the CSI-RS signal;
the processor 132 is configured to determine first precoding matrix indication information of the sparse linear array according to the second precoding matrix indication information;
the transceiver 131 is configured to send the first precoding matrix indicator to the network side device.
In this embodiment of the present invention, optionally, the processor 132 is configured to perform downlink channel estimation according to the CSI-RS signal, and calculate a downlink channel matrix observed quantity;
the processor 132 obtains a second precoding matrix according to the downlink channel matrix observed quantity;
the processor 132 determines the second precoding matrix indication information according to the second precoding matrix.
In this embodiment of the present invention, optionally, the processor 132 is configured to calculate, according to a channel capacity maximization criterion, the second precoding matrix based on a first codebook, where the first codebook is a codebook corresponding to a second uniform linear array, and the number of antennas of the second uniform linear array is equal to the number of antennas of the first antenna.
In this embodiment of the present invention, optionally, the processor 132 is configured to determine the first precoding matrix indication information according to the second precoding matrix indication information, the number of antennas of the first uniform linear array, and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same aperture as the sparse linear array, the distribution position of the second antenna corresponds to the distribution position of the first antenna, or the second antenna comprises a third antenna in the first uniform linear array and an antenna in the first uniform linear array before the third antenna is arranged, and the position of the third antenna corresponds to the position of the last antenna arranged in the sparse linear array.
In this embodiment of the present invention, optionally, the processor 132 is configured to receive first information sent by the network side device, where the first information includes the number of antennas in the first uniform linear array and the number of second antennas in the first uniform linear array.
Referring to fig. 14, an embodiment of the present invention further provides a network device 140, which includes a processor 141, a memory 142, and a computer program stored in the memory 142 and capable of running on the processor 141, where the computer program is executed by the processor 141 to implement the processes of the precoding method embodiment, and can achieve the same technical effects, and details are not repeated here to avoid repetition.
Referring to fig. 15, an embodiment of the present invention further provides a terminal 150, which includes a processor 151, a memory 152, and a computer program stored in the memory 152 and capable of running on the processor 151, where the computer program, when executed by the processor 151, implements each process of the above-mentioned information determining method embodiment, and can achieve the same technical effect, and is not described herein again to avoid repetition.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the foregoing precoding method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a terminal) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (18)
1. A precoding method is applied to a network side device, the network side device comprises a sparse linear array of antennas, and the precoding method is characterized by comprising the following steps:
selecting a first antenna from the antennas of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of uniform linear array precoding codebooks specified in advance;
and transmitting a CSI-RS signal to a terminal by using the first antenna.
2. The precoding method as claimed in claim 1, wherein after the transmitting the CSI-RS signal to the terminal by using the first antenna, further comprising:
receiving first precoding matrix indication information of the sparse linear array sent by the terminal, wherein the first precoding matrix indication information is determined by the terminal according to second precoding matrix indication information which is determined according to the CSI-RS signal;
determining a precoding matrix of the sparse linear array according to the first precoding matrix indication information;
and precoding information to be transmitted by adopting the precoding matrix.
3. Precoding method according to claim 1, characterized in that the first antenna arrangement is uniform or symmetrical or non-continuous.
4. The method of claim 1,
the number of the first antennas is the number of antennas which is not more than the total number of antennas of the sparse linear array and is closest to the total number of antennas of the sparse linear array in the number of antennas corresponding to the predefined uniform linear array precoding codebooks.
5. The precoding method according to claim 2, wherein before the receiving the first precoding matrix indicator information of the sparse linear array sent by the terminal, the method further comprises:
sending first information to the terminal, wherein the first information comprises the number of antennas of a first uniform linear array and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same caliber as that of the thin cloth linear array, and the distribution position of the second antenna corresponds to that of the first antenna.
6. An information determination method applied to a terminal is characterized by comprising the following steps:
receiving a CSI-RS signal sent by network side equipment, wherein the network side equipment comprises an antenna of a sparse linear array, and the CSI-RS signal is sent by the network side equipment by using a first antenna selected from the antenna of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of predetermined uniform linear array precoding codebooks.
7. The method of claim 6, wherein after receiving the CSI-RS signal transmitted by the network side device, the method further comprises:
determining second precoding matrix indication information according to the CSI-RS signal;
determining first precoding matrix indication information of the sparse linear array according to the second precoding matrix indication information;
and sending the first precoding matrix indication information to the network side equipment.
8. The information determining method according to claim 7, wherein the determining second precoding matrix indicator information according to the CSI-RS signal comprises:
estimating a downlink channel according to the CSI-RS signal, and calculating downlink channel matrix observed quantity;
obtaining a second precoding matrix according to the downlink channel matrix observed quantity;
and determining the second precoding matrix indication information according to the second precoding matrix.
9. The information determining method of claim 8, wherein the obtaining a second precoding matrix from the downlink channel matrix observations comprises:
and calculating to obtain the second precoding matrix based on a first codebook according to a channel capacity maximization criterion, wherein the first codebook is a codebook corresponding to a second uniform linear array, and the number of the antennas of the second uniform linear array is equal to that of the first antennas.
10. The information determining method according to claim 7, wherein the determining first precoding matrix indicator information of the sparse linear array according to the second precoding matrix indicator information comprises:
determining the first precoding matrix indication information according to the second precoding matrix indication information, the number of antennas of a first uniform linear array and the number of second antennas in the first uniform linear array;
the first uniform linear array is a uniform linear array with the same caliber as that of the thin cloth linear array, and the distribution position of the second antenna corresponds to that of the first antenna.
11. The information determining method according to claim 10, wherein before determining the first precoding matrix indicator information according to the second precoding matrix indicator information, the number of antennas of the first uniform linear array, and the number of second antennas in the first uniform linear array, the method further comprises:
and receiving first information sent by the network side equipment, wherein the first information comprises the number of the antennas in the first uniform linear array and the number of the second antennas in the first uniform linear array.
12. A network side device, the network side device comprising a sparse linear array of antennas, comprising:
the first selection module is used for selecting a first antenna from the antennas of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of uniform linear array precoding codebooks specified in advance;
and the first sending module is used for sending the CSI-RS signal to the terminal by using the first antenna.
13. A terminal, comprising:
the network side equipment comprises a first receiving module and a second receiving module, wherein the first receiving module is used for receiving a CSI-RS signal sent by the network side equipment, the network side equipment comprises sparse linear array antennas, and the CSI-RS signal is sent by the network side equipment by using a first antenna selected from the sparse linear array antennas; the number of the first antennas is selected from the number of antennas corresponding to a plurality of predetermined uniform linear array precoding codebooks.
14. A network-side device, wherein the network-side device comprises a sparse linear array of antennas, comprising: a transceiver and a processor;
the processor is used for selecting a first antenna from the antennas of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of uniform linear array precoding codebooks specified in advance;
the transceiver is used for transmitting a CSI-RS signal to a terminal by using the first antenna.
15. A terminal, comprising: a transceiver and a processor;
the transceiver is used for receiving a CSI-RS signal sent by network side equipment, the network side equipment comprises an antenna of a sparse linear array, and the CSI-RS signal is sent by the network side equipment by using a first antenna selected from the antenna of the sparse linear array; the number of the first antennas is selected from the number of antennas corresponding to a plurality of predetermined uniform linear array precoding codebooks.
16. A network-side device, comprising: processor, memory and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the precoding method as defined in anyone of claims 1 to 5.
17. A terminal, comprising: processor, memory and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the information determination method according to any of claims 6 to 11.
18. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, realizes the pre-coding method as set forth in any one of claims 1 to 5 or the steps of the information determination method as set forth in any one of claims 6 to 11.
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