CN112260735B - Codebook determination method, terminal and storage medium - Google Patents

Codebook determination method, terminal and storage medium Download PDF

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CN112260735B
CN112260735B CN202011073311.2A CN202011073311A CN112260735B CN 112260735 B CN112260735 B CN 112260735B CN 202011073311 A CN202011073311 A CN 202011073311A CN 112260735 B CN112260735 B CN 112260735B
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channel correlation
channel
standard beam
codebook
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CN112260735A (en
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刘君
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Zeku Technology Beijing Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting

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Abstract

The embodiment of the application discloses a codebook determining method, a terminal and a storage medium, wherein the terminal is communicated with a base station, the base station comprises a plurality of antenna panels in the horizontal direction, and the method comprises the following steps: acquiring a broadband channel correlation matrix, and determining a polarization channel correlation matrix according to the broadband channel correlation matrix; selecting a plurality of standard beam groups in a power domain by utilizing a polarization channel correlation matrix to obtain M1 standard beam groups; m1 is a natural number greater than 1; acquiring optimal channel correlation factors among a plurality of antenna panels corresponding to each group in M1 standard beam groups, and combining each group in M1 standard beam groups with the corresponding optimal channel correlation factors to obtain M1 candidate first-stage codebooks; and selecting the M1 candidate first-stage codebooks in a broadband domain and a subband domain to obtain the optimal first-stage codebook.

Description

Codebook determination method, terminal and storage medium
Technical Field
The embodiment of the application relates to the technical field of communication, in particular to a codebook determining method, a terminal and a storage medium.
Background
Massive MIMO (Massive MIMO) technology is a key part of communication technology. In consideration of the workload of codebook design, a parameterized codebook scheme is adopted.
Currently, the parametric codebook scheme is determined by a unified codebook framework in combination with a plurality of codebook parameters, and the structure of the parametric codebook scheme comprises a first-level codebook and a second-level codebook. The first-stage codebook represents the channel correlation in the same polarization direction and describes the long-term wideband statistical characteristics of the channel, and the second-stage codebook represents the channel correlation in different polarization directions at the same physical position and describes the short-term sub-band information of the channel. The terminal mainly selects the optimal beam group in a broadband capacity domain or a mutual information domain at present, so that the optimal first-stage codebook is determined and provided for a corresponding base station, and the realization complexity is high.
Disclosure of Invention
The embodiment of the application provides a codebook determining method, a terminal and a storage medium, wherein the terminal is communicated with a base station, and the terminal sequentially determines an optimal first-level codebook in a power domain, a broadband domain and a sub-band domain under the condition that the base station comprises a plurality of antenna panels in the horizontal direction, so that the complexity of implementation is reduced, and the communication performance is ensured.
The technical scheme of the embodiment of the application is realized as follows:
the embodiment of the application provides a codebook determining method, which is applied to a terminal, wherein the terminal is communicated with a base station, the base station comprises a plurality of antenna panels in the horizontal direction, and the method comprises the following steps:
acquiring a broadband channel correlation matrix, and determining a polarization channel correlation matrix according to the broadband channel correlation matrix;
selecting a plurality of standard beam groups in a power domain by using the polarization channel correlation matrix to obtain M1 standard beam groups; m1 is a natural number greater than 1;
obtaining optimal channel correlation factors among the antenna panels corresponding to each group in the M1 standard beam groups, and combining each group in the M1 standard beam groups with the corresponding optimal channel correlation factors to obtain M1 candidate first-stage codebooks;
and selecting the M1 candidate first-stage codebooks in a broadband domain and a subband domain to obtain an optimal first-stage codebook.
In the above method, the determining a polarization channel correlation matrix according to the wideband channel correlation matrix includes:
acquiring a first channel correlation matrix corresponding to a first polarization direction and a second channel correlation matrix corresponding to a second polarization direction from the broadband channel correlation matrix;
and determining the sum of the first channel correlation matrix and the second channel correlation matrix as the polarization channel correlation matrix.
In the above method, the selecting, in a power domain, a plurality of standard beam groups by using the polarization channel correlation matrix to obtain M1 standard beam groups includes:
determining a channel power corresponding to each beam in the plurality of standard beam groups by using the polarization channel correlation matrix;
determining a channel power sum corresponding to each group in the plurality of standard beam groups according to the channel power;
sequencing the plurality of standard beam groups according to the corresponding channel power sum from large to small to obtain a beam group sequence;
and selecting the first standard beam group to the M1 th standard beam group from the beam group sequence to obtain the M1 standard beam groups.
In the above method, the obtaining the optimal channel correlation factor between the antenna panels corresponding to each of the M1 standard beam groups includes:
acquiring a first correlation factor candidate set; the first correlation factor candidate set comprises a plurality of preset factors for measuring the channel correlation among different antenna panels;
for each of the M1 standard beam groups, selecting an optimal channel correlation factor of each non-reference panel of the multiple antenna panels with respect to a preset reference panel from the first correlation factor candidate set, and forming an optimal channel correlation factor between the corresponding multiple antenna panels;
the non-reference panel is an antenna panel different from the preset reference panel in the plurality of antenna panels.
In the above method, the selecting, for each of the M1 standard beam groups, an optimal channel correlation factor of each non-reference panel of the multiple antenna panels with respect to a preset reference panel from the first correlation factor candidate set includes:
aiming at a first standard beam group, respectively calculating a corresponding first power value under the condition that each factor in the first correlation factor candidate set is used as a channel correlation factor of a first non-reference panel relative to a preset reference panel, so as to obtain a first power value set; the first standard beam group is any one of the M1 standard beam groups, and the first non-reference panel is any one of the plurality of antenna panels;
selecting a maximum power value from the first power value set;
and determining a factor corresponding to the maximum power value in the first correlation factor candidate set as an optimal channel correlation factor of the first non-reference panel corresponding to the first standard beam group relative to the preset reference panel.
In the above method, the selecting the M1 candidate first-level codebooks in the wideband domain and the subband domain to obtain an optimal first-level codebook includes:
acquiring a second correlation factor candidate set; the second correlation factor candidate set comprises a plurality of preset factors for measuring the channel correlation between the beams in two different polarization directions at the same physical position;
combining each codebook in the M1 candidate first-stage codebooks with each factor in the second correlation factor candidate set to obtain a plurality of first precoding matrixes;
based on the plurality of first precoding matrixes, selecting the M1 candidate first-level codebooks in a broadband domain to obtain M2 candidate first-level codebooks; m2 is a natural number greater than 1 and equal to or less than M1;
combining each codebook in the M2 candidate first-stage codebooks with each factor in the second correlation factor candidate set to obtain a plurality of second precoding matrixes;
and selecting the M2 candidate first-stage codebooks in the subband domain based on the plurality of second precoding matrixes to obtain the optimal first-stage codebook.
In the above method, the selecting the M1 candidate first-level codebooks in a wideband domain based on the plurality of first precoding matrices to obtain M2 candidate first-level codebooks includes:
determining an equivalent channel matrix corresponding to each matrix in the plurality of first precoding matrices according to the broadband channel correlation matrix to obtain a plurality of equivalent channel matrices;
determining broadband information corresponding to each matrix in the equivalent channel matrixes; the broadband information is a broadband determinant value or a broadband capacity value;
sequencing the plurality of first pre-coding matrixes from large to small according to corresponding broadband information to obtain a first matrix sequence;
selecting a first precoding matrix to an Nth precoding matrix from the first matrix sequence to obtain N precoding matrices; n is a natural number greater than 1;
and selecting each codebook forming the N precoding matrixes from the M1 candidate first-stage codebooks to obtain the M2 candidate first-stage codebooks.
In the above method, the selecting the M2 candidate first-level codebooks in the subband domain based on the plurality of second precoding matrices to obtain the optimal first-level codebook includes:
determining the sum of the sub-band mutual information corresponding to each matrix in the plurality of second pre-coding matrixes;
determining corresponding sub-band mutual information and the largest pre-coding matrix in the plurality of second pre-coding matrixes as a target pre-coding matrix;
and selecting a codebook forming the target precoding matrix from the M2 candidate first-stage codebooks to obtain the optimal first-stage codebook.
The embodiment of the present application provides a terminal, the terminal communicates with a base station, the base station includes a plurality of antenna panels in the horizontal direction, the terminal includes:
the determining module is used for acquiring a broadband channel correlation matrix and determining a polarization channel correlation matrix according to the broadband channel correlation matrix;
the selection module is used for selecting a plurality of standard beam groups in a power domain by using the polarization channel correlation matrix to obtain M1 standard beam groups; m1 is a natural number greater than 1;
the combination module is used for acquiring channel correlation factors among the plurality of antenna panels corresponding to each group in the M1 standard beam groups, and combining each group in the M1 standard beam groups with the corresponding channel correlation factors to obtain M1 candidate first-stage codebooks;
the selection module is further configured to select the M1 candidate first-stage codebooks in a wideband domain and a subband domain to obtain an optimal first-stage codebook.
An embodiment of the present application provides a terminal, including: a processor, a memory, and a communication bus;
the communication bus is used for realizing communication connection between the processor and the memory;
the processor is configured to execute the codebook determination method stored in the memory to implement the codebook determination method.
An embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the codebook determination method described above.
The embodiment of the application provides a codebook determining method, a terminal and a storage medium, wherein the terminal is communicated with a base station, the base station comprises a plurality of antenna panels in the horizontal direction, and the method comprises the following steps: acquiring a broadband channel correlation matrix, and determining a polarization channel correlation matrix according to the broadband channel correlation matrix; selecting a plurality of standard beam groups in a power domain by utilizing a polarization channel correlation matrix to obtain M1 standard beam groups; m1 is a natural number greater than 1; acquiring optimal channel correlation factors among a plurality of antenna panels corresponding to each group in M1 standard beam groups, and combining each group in M1 standard beam groups with the corresponding optimal channel correlation factors to obtain M1 candidate first-stage codebooks; and selecting the M1 candidate first-stage codebooks in a broadband domain and a subband domain to obtain the optimal first-stage codebook. According to the technical scheme provided by the embodiment of the application, the terminal is communicated with the base station, and the terminal sequentially determines the optimal first-level codebook in the power domain, the broadband domain and the sub-band domain to provide the optimal first-level codebook for the base station under the condition that the base station comprises a plurality of antenna panels in the horizontal direction, so that the complexity of implementation is reduced, and the communication performance is ensured.
Drawings
Fig. 1 is a schematic diagram of an exemplary horizontal multiple antenna panel provided in an embodiment of the present application;
fig. 2 is a flowchart illustrating a codebook determination method according to an embodiment of the present application;
fig. 3(a) is a schematic diagram of an exemplary antenna arrangement provided in the embodiments of the present application;
fig. 3(b) is a schematic diagram of an exemplary antenna arrangement provided in the embodiment of the present application;
fig. 3(c) is a schematic diagram of an exemplary antenna arrangement provided in the embodiment of the present application;
fig. 3(d) is a schematic diagram of an exemplary antenna arrangement provided in the embodiment of the present application;
fig. 4 is a first schematic structural diagram of a terminal according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application;
fig. 6 is a third schematic structural diagram of a terminal according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application provides a codebook determining method, which is realized through a terminal, wherein the terminal can be an electronic device such as a mobile phone and a tablet computer, and the embodiment of the application is not limited. In addition, the terminal communicates with the base station, the base station includes a plurality of antenna panels in the horizontal direction, and the number of the specific base station and the plurality of antenna panels is not limited in the embodiments of the present application.
Fig. 1 is a schematic diagram of an exemplary horizontal multiple antenna panel provided in an embodiment of the present application. As shown in FIG. 1, the base station includes N in the horizontal directiongAn antenna panel, NgIs a natural number greater than 1. Wherein the center distance between adjacent antenna panels is dgHAnd, a large number of antennas may be arranged on one antenna panel.
It should be noted that, at present, two codebook types are defined, one is a Class a codebook used for channel state information feedback of normal precision, and the other is an enhanced codebook of Class a. The codebook with the conventional precision is defined as a Type I codebook, namely, a codebook mode is a first Type, and the method for determining the first-stage codebook is provided under the scene of the first-Type codebook mode and the multi-antenna panel.
Fig. 2 is a flowchart illustrating a codebook determination method according to an embodiment of the present application. As shown in fig. 1, the codebook determination method includes the steps of:
s101, obtaining a broadband channel correlation matrix, and determining a polarization channel correlation matrix according to the broadband channel correlation matrix.
In the embodiment of the present application, the terminal may first obtain the wideband channel correlation matrix, and determine the polarization channel correlation matrix according to the wideband channel correlation matrix.
Specifically, in the embodiment of the present application, the terminal may obtain the number of sampling points in the entire reporting bandwidth and the channel impulse response of each sampling point, so as to obtain the wideband channel correlation matrix R according to the following formula (1)wb：
Figure BDA0002715856510000071
Wherein, N is the number of sampling points in the whole reporting bandwidth, HkIs the channel impulse response of sample k. Wherein R iswb,00For a first channel correlation matrix, R, corresponding to a first polarization directionwb,01Is a channel correlation matrix, R, between a first polarization direction and a second polarization directionwb,10Is a channel correlation matrix, R, between the second polarization direction and the first polarization directionwb,11A second channel correlation matrix corresponding to a second polarization direction.
Specifically, in an embodiment of the present application, the determining, by the terminal, a polarization channel correlation matrix according to the wideband channel correlation matrix includes: acquiring a first channel correlation matrix corresponding to a first polarization direction and a second channel correlation matrix corresponding to a second polarization direction from the broadband channel correlation matrix; and determining the sum of the first channel correlation matrix and the second channel correlation matrix as a polarization channel correlation matrix.
It should be noted that, in the embodiment of the present application, the terminal determines the polarization channel correlation matrix R according to the wideband channel correlation matrix, specifically, according to the following formula (2)wb,pol：
Figure BDA0002715856510000072
Wherein iPol is 0 tableFirst polarization direction, iPol 1 second polarization direction, N1Number of antenna ports in horizontal direction in one polarization direction of base station, N2Number of antenna ports in a vertical direction in a polarization direction of a base station, N1And N2The terminal can directly acquire the information.
S102, selecting a plurality of standard beam groups in a power domain by utilizing a polarization channel correlation matrix to obtain M1 standard beam groups; m1 is a natural number greater than 1.
In the embodiment of the application, after the terminal obtains the polarization channel correlation matrix, the terminal can select a plurality of standard beam groups in a power domain by using the polarization channel correlation matrix to obtain M1 standard beam groups; m1 is a natural number greater than 1.
Specifically, in the embodiment of the present application, the terminal selects a plurality of standard beam groups in the power domain by using a polarization channel correlation matrix, to obtain M1 standard beam groups, including: determining the channel power corresponding to each beam in the plurality of standard beam groups by using the polarization channel correlation matrix; determining the channel power sum corresponding to each group in a plurality of standard beam groups according to the channel power; sequencing the plurality of standard beam groups according to the corresponding channel power sum from large to small to obtain a beam group sequence; and selecting the first standard beam group to the M1 th standard beam group from the beam group sequence to obtain M1 standard beam groups.
It should be noted that, in the embodiment of the present application, each of the plurality of standard beam groups includes two beams in one polarization direction, and the terminal may determine the channel power corresponding to each beam by using the polarization channel correlation matrix.
Specifically, in the embodiment of the present application, the terminal determines, by using the polarized channel correlation matrix, the channel power corresponding to each beam according to the following formula (3):
Figure BDA0002715856510000081
wherein R iswb,polFor polarizing the channel correlation matrix, vl,mFor any beam in any of the plurality of standard beam groups.
It can be understood that, in the embodiment of the present application, after determining the channel power corresponding to each beam, the terminal may respectively and correspondingly add the channel powers corresponding to the beams included in each of the plurality of standard beam groups, so as to obtain a channel power sum corresponding to each of the plurality of standard beam groups.
Specifically, in the embodiment of the present application, for any one of the plurality of standard beam groups, the terminal may determine the corresponding channel power sum according to the following formula (4):
Figure BDA0002715856510000082
wherein the content of the first and second substances,
Figure BDA0002715856510000083
is a wave beam vl,mThe corresponding channel power is set to be,
Figure BDA0002715856510000084
is a wave beam vl′,m′Corresponding channel power, beam vl,mAnd beam vl′,m′The sum P is the channel power sum corresponding to the standard beam group.
It should be noted that, in the embodiment of the present application, the terminal may rank the plurality of standard beam groups according to the channel power sum. Specifically, the terminal sorts the plurality of standard beam groups according to the channel power sum from large to small, so as to obtain a beam group sequence, and then the terminal can select the first standard beam group value M1 th standard beam group from the beam group sequence, so as to obtain M1 standard beam groups, that is, the first M1 standard beam groups in the beam group sequence are selected.
It should be noted that, in the embodiment of the present application, the value of M1 may be determined according to actual requirements, and the embodiment of the present application is not limited.
S103, obtaining optimal channel correlation factors among a plurality of antenna panels corresponding to each group in the M1 standard beam groups, and combining each group in the M1 standard beam groups with the corresponding optimal channel correlation factors to obtain M1 candidate first-stage codebooks.
In the embodiment of the present application, after selecting M1 standard beam groups, the terminal may obtain channel correlation factors between multiple antenna panels corresponding to each group and correspondingly combine the channel correlation factors, thereby obtaining M1 candidate first-level codebooks.
Specifically, in the embodiment of the present application, the obtaining, by the terminal, the optimal channel correlation factor between multiple antenna panels corresponding to each of M1 standard beam groups includes: acquiring a first correlation factor candidate set; the first correlation factor candidate set comprises a plurality of preset factors for measuring the channel correlation among different antenna panels; respectively selecting the optimal channel correlation factor of each non-reference panel in a plurality of antenna panels relative to a preset reference panel from the first correlation factor candidate set aiming at each group in M1 standard beam groups to form the optimal channel correlation factor among the corresponding antenna panels; the non-reference panel is an antenna panel different from a preset reference panel in the plurality of antenna panels.
It should be noted that, in the embodiment of the present application, a first correlation factor candidate set is stored in the terminal, where the first correlation factor candidate set includes selectable channel correlation factors between different antenna panels. Specific first correlation factor candidate set is not limited in the embodiments of the present application.
It should be noted that, in the embodiment of the present application, one of the antenna panels in the horizontal direction of the base station is a preset reference panel, and the other antenna panels are non-reference panels.
Specifically, in this embodiment of the present application, for each of M1 standard beam groups, the terminal selects an optimal channel correlation factor of each non-reference panel in the multiple antenna panels with respect to a preset reference panel from the first correlation factor candidate set, respectively, including: aiming at the first standard beam group, respectively calculating a corresponding first power value under the condition that each factor in the first correlation factor candidate set is used as an optimal channel correlation factor of the first non-reference panel relative to a preset reference panel, and obtaining a first power value set; the first standard beam group is any one of the M1 standard beam groups, and the first non-reference panel is any one of the plurality of antenna panels; selecting a maximum power value from the first power value set; and determining the factor corresponding to the maximum power value in the first correlation factor candidate set as the optimal channel correlation factor of the first non-reference panel corresponding to the first standard beam group relative to a preset reference panel.
Illustratively, in an embodiment of the present application, the codebook pattern is of a first type, including at a plurality of antenna panels: panel0 and panel1, with panel0 being the preset reference panel, the termination is for the first standard beam group (v)l,m，vl′,m′) In the case where each factor in the first correlation factor candidate set is a channel correlation factor of the panel1 with respect to the panel0, the corresponding first power value P may be calculated according to the following formula (5):
Figure BDA0002715856510000101
wherein R is13Representing the channel correlation between Panel0 polarization orientation 0 and Panel1 polarization orientation 0, R31Representing the channel correlation, R, between Panel1 polarization orientation 0 and Panel0 polarization orientation 024Representing the channel correlation, R, between Panel0 polarization orientation 1 and Panel1 polarization orientation 142The channel correlation between the Panel1 polarization direction 1 and the Panel0 polarization direction 1 is shown, and both terminals can directly acquire the channel correlation.
Figure BDA0002715856510000102
And for any factor in the first correlation factor candidate set, P is a corresponding first power value, all power values form the first power value set, and the terminal determines the factor corresponding to the maximum power value as the optimal channel correlation factor of the panel1 relative to the panel 0.
Illustratively, in an embodiment of the present application, the codebook pattern is of a first type, including at a plurality of antenna panels: panel0, panel1, panel2 and el3, with the panel of panel0 being the predetermined reference panel, the termination is for the first standard beam group (v)l,m，vl′,m′) In the case where each factor in the first correlation factor candidate set is calculated as a channel correlation factor of the panel1 with respect to the panel0 according to the following formula (6), the corresponding power value P may be calculated1：
Figure BDA0002715856510000103
Wherein R is13、R31、R24 R42And
Figure BDA0002715856510000104
the meaning of (a) is as described in the example above.
Figure BDA0002715856510000105
Is any factor in the first correlation factor candidate set, P1For the corresponding power value, as in the above example, the terminal may also determine the factor corresponding to the maximum power value as the optimal channel correlation factor of the panel1 relative to the panel 0.
Further, the terminal targets a first standard beam group (v)l,m，vl′,m′) In the case where each factor in the first correlation factor candidate set is calculated as a channel correlation factor of the panel2 with respect to the panel0 according to the following formula (7), the corresponding power value P may be calculated2：
Figure BDA0002715856510000111
Wherein R is15Representing the channel correlation between Panel0 polarization orientation 0 and Panel2 polarization orientation 0, R51Representing the channel correlation, R, between Panel2 polarization orientation 0 and Panel0 polarization orientation 026Representing the channel correlation, R, between Panel0 polarization orientation 1 and Panel2 polarization orientation 162Representing the channel correlation between Panel2 polarization direction 1 and Panel0 polarization direction 1.
Figure BDA0002715856510000112
Indicating the channel correlation of Panel2 with respect to Panel0,
Figure BDA0002715856510000113
is any factor in the first correlation factor candidate set, P2For the corresponding power value, the terminal may also determine the factor corresponding to the maximum power value as the optimal channel correlation factor of the panel2 relative to the panel 0.
Further, the terminal targets a first standard beam group (v)l,m，vl′,m′) In the case where each factor in the first correlation factor candidate set is calculated as a channel correlation factor of the panel3 with respect to the panel0 according to the following formula (8), the corresponding power value P may be calculated3：
Figure BDA0002715856510000114
In the formula, R17Representing the channel correlation, R, between Panel0 and Panel3 polarization directions 0 and 071Representing the channel correlation, R, between Panel3 polarization orientation 0 and Panel0 polarization orientation 028Representing the channel correlation, R, between Panel0 polarization orientation 1 and Panel3 polarization orientation 182Representing the channel correlation between Panel3 polarization direction 1 and Panel0 polarization direction 1.
Figure BDA0002715856510000115
Indicating the channel correlation of Panel3 with respect to Panel0,
Figure BDA0002715856510000116
is any factor in the first correlation factor candidate set, P3For the corresponding power value, the terminal may also determine the factor corresponding to the maximum power value as the optimal channel correlation factor of the panel3 relative to the panel 0.
It should be noted that, in the embodiment of the present application, when the number of the multiple antenna panels is greater than 2, for each of M1 standard beam groups, the optimal channel correlation factors of different non-reference panels acquired by the terminal with respect to the reference panel constitute the optimal channel correlation factors between the multiple antenna panels corresponding to the group.
In the embodiment of the present application, after obtaining the optimal channel correlation factors between multiple antenna panels corresponding to each group in M1 standard beam groups, the terminal may perform corresponding combination to obtain the corresponding candidate first-stage codebook.
Illustratively, in the embodiments of the present application, the M1 standard beam groups include a beam group (v)l,m，vl′,m′) The optimal channel correlation factor among the corresponding antenna panels is
Figure BDA0002715856510000121
Then its constituent candidate first-level codebooks are
Figure BDA0002715856510000122
Wherein, in the case that the plurality of antenna panels are four,
Figure BDA0002715856510000123
the optimal channel factors of the three non-reference panels relative to the preset reference panel respectively are included.
S104, selecting the M1 candidate first-stage codebooks in the broadband domain and the subband domain to obtain the optimal first-stage codebook.
In the embodiment of the present application, after obtaining M1 candidate first-level codebooks, the terminal may select M1 candidate first-level codebooks in the wideband domain and the subband domain to obtain an optimal first-level codebook.
Specifically, in the embodiment of the present application, the terminal selects M1 candidate first-level codebooks in a wideband domain and a subband domain, including: acquiring a second correlation factor candidate set; the second correlation factor candidate set comprises a plurality of preset factors for measuring the channel correlation between the beams in two different polarization directions at the same physical position; combining each codebook in the M1 candidate first-stage codebooks with each factor in the second correlation factor candidate set to obtain a plurality of first precoding matrixes; based on a plurality of first precoding matrixes, selecting M1 candidate first-level codebooks in a broadband domain to obtain M2 candidate first-level codebooks: m2 is a natural number greater than 1 and equal to or less than M1; combining each codebook in the M1 candidate first-stage codebooks with each factor in the second correlation factor candidate set to obtain a plurality of second precoding matrixes; and selecting the M2 candidate first-stage codebooks in the subband domain based on the plurality of second precoding matrixes to obtain the optimal first-stage codebook.
Illustratively, in embodiments of the present application, when the codebook pattern is of a first type and the plurality of antenna panels include panel0 and panel1, for a first level of the codebook pattern
Figure BDA0002715856510000124
Wherein, due to the number N of antenna panelsg＝2，
Figure BDA0002715856510000131
That is, the optimal channel correlation factor of the panel1 relative to the panel0, the terminal can associate the optimal channel correlation factor with each factor in the second candidate set {1, j } of correlation factors according to the following formula
Figure BDA0002715856510000132
Combining:
Figure BDA0002715856510000133
Figure BDA0002715856510000134
if R is 1
Figure BDA0002715856510000135
If R is 2
Figure BDA0002715856510000136
If R is 3
Figure BDA0002715856510000137
If R is 4
Figure BDA0002715856510000138
Wherein R represents the number of data streams that the terminal can transmit, PCSI-RSThe number of CSI-RS ports is sent to the base station, and the terminal can directly acquire the number.
Figure BDA0002715856510000139
And
Figure BDA00027158565100001310
the precoding matrixes are respectively corresponding to different R values, namely corresponding first precoding matrixes.
Fig. 3(a) to 3(d) are schematic diagrams of antenna arrangements of exemplary panel0 and panel1 provided in embodiments of the present application. V in the above formula (9)l,m、
Figure BDA00027158565100001311
And
Figure BDA00027158565100001312
fig. 3(a) to 3(d) correspond in sequence, where fig. 3(a) is a schematic diagram of antennas arranged in a first polarization direction of the panel0, and fig. 3(b) is a schematic diagram of antennas arranged in a second polarization direction of the panel0, and the antennas corresponding to the positions in the two diagrams are at the same physical position. Fig. 3(c) shows an antenna arrangement in a first polarization direction of the panel1, and fig. 3(d) shows an antenna arrangement in a second polarization direction of the panel1, where the antennas are located at the same physical location.
Illustratively, in embodiments of the present application, when the codebook pattern is of a first type and the plurality of antenna panels includes panel0, panel1, panel2, and panel3, for a first level of the codebook pattern
Figure BDA0002715856510000141
Wherein, due to the number N of antenna panelsg＝4，
Figure BDA0002715856510000142
I.e., including the optimal channel correlation factor for the panel1 relative to the panel0
Figure BDA0002715856510000143
Optimal channel correlation factor for panel2 relative to panel0
Figure BDA0002715856510000144
And the optimal channel correlation factor for the panel3 relative to the panel0
Figure BDA0002715856510000145
The terminal may associate it with each factor in the second candidate set of correlation factors {1, j } according to the following equation
Figure BDA0002715856510000146
Combining:
Figure BDA0002715856510000147
Figure BDA0002715856510000148
if R is 1
Figure BDA0002715856510000149
If R is 2
Figure BDA00027158565100001410
If R is 3
Figure BDA00027158565100001411
If R is 4
Figure BDA00027158565100001412
The meaning of each identifier is the same as that of the previous example, and is not described herein again.
Specifically, in the embodiment of the present application, the terminal selects M1 candidate first-level codebooks in a wideband domain based on a plurality of first precodes, to obtain M2 candidate first-level codebooks, including: determining an equivalent channel matrix corresponding to each matrix in the plurality of first precoding matrixes according to the broadband channel correlation matrix to obtain a plurality of equivalent channel matrixes; determining broadband information corresponding to each matrix in a plurality of equivalent channel matrixes; the broadband channel is a broadband determinant value or a broadband capacity value; sequencing the plurality of first pre-coding matrixes from large to small according to corresponding broadband information to obtain a first matrix sequence; selecting a first precoding matrix to an Nth precoding matrix from the first matrix sequence to obtain N precoding matrices; n is a natural number greater than 1; and selecting each codebook forming N precoding matrixes from the M1 candidate first-stage codebooks to obtain M2 candidate first-stage codebooks.
It should be noted that, in the embodiment of the present application, for each matrix W in the plurality of first precoding matrices, the terminal depends on the wideband channel correlation matrix RwbThe corresponding equivalent channel matrix can be calculated according to the following equation (21):
Req＝WH·Rwb·W (21)
it should be noted that, in the embodiment of the present application, the terminal determines the wideband information corresponding to each of the multiple equivalent channel matrices, which may be to determine a wideband determinant value of each equivalent channel matrix, that is, to calculate (R)eq+ I), where I is a predefined diagonal matrix, or calculating the corresponding equivalent SNR, and then calculating the equivalent SNRAnd calculating a corresponding broadband capacity value by the signal-to-noise ratio.
It can be understood that, in the embodiment of the present application, after obtaining the wideband information corresponding to each matrix in the multiple equivalent channel matrices, the terminal may sequence the multiple first precoding matrices according to the size of the wideband information, so as to obtain a first matrix sequence, further select the first N precoding matrices from the first matrix sequence, and select out codebooks forming the N precoding matrices from the M1 candidate first-level codebooks, so as to obtain M2 candidate first-level codebooks.
It should be noted that, in the embodiment of the present application, after obtaining M2 candidate first-level codebooks, the terminal may continue to combine each codebook in the M2 candidate first-level codebooks with each factor in the second related factor candidate set to obtain a plurality of second precoding matrices, where a specific combination manner of the second precoding matrices is similar to the manner of determining the first precoding matrices, and details are not described here.
Specifically, in the embodiment of the present application, the terminal selects M2 candidate first-level codebooks in the subband domain based on a plurality of second precoding matrices to obtain an optimal first-level codebook, including: determining the sum of the sub-band mutual information corresponding to each matrix in the plurality of second pre-coding matrixes; determining corresponding sub-band mutual information and the largest pre-coding matrix in the plurality of second pre-coding matrixes as a target pre-coding matrix; and selecting the codebook forming the target precoding matrix from the M2 candidate first-stage codebooks to obtain the optimal first-stage codebook.
It should be noted that, in the embodiment of the present application, the terminal may calculate, for each second precoding matrix, corresponding sub-band mutual information, and further sum all sub-band mutual information corresponding to each second precoding matrix according to the following formula (22) to obtain corresponding sub-band mutual information and MIwb：
Figure BDA0002715856510000161
Wherein J is the number of reported sub-bands, which can be directly acquired by the terminal, and MI issb,jFor mutual communication of one sub-bandAnd (4) information.
It can be understood that, in the embodiment of the present application, after obtaining the subband mutual information corresponding to each second precoding matrix and the sum, the terminal may select the subband mutual information and the largest precoding matrix from the plurality of second precoding matrices as a target precoding matrix, and correspondingly, from the M2 candidate first-level codebooks, a codebook of the target precoding matrix is formed, which is the optimal first-level codebook.
It can be understood that, in the embodiment of the present application, after determining the optimal first-stage codebook, the terminal may indicate the optimal first-stage codebook to the base station, so that the base station knows the first-stage codebook, and may perform precoding by using the first-stage codebook in subsequent information transmission with the terminal, thereby improving communication performance and effect.
The embodiment of the application provides a codebook determining method, which is applied to a terminal, wherein the terminal is communicated with a base station, the base station comprises a plurality of antenna panels in the horizontal direction, and the method comprises the following steps: acquiring a broadband channel correlation matrix, and determining a polarization channel correlation matrix according to the broadband channel correlation matrix; selecting a plurality of standard beam groups in a power domain by utilizing a polarization channel correlation matrix to obtain M1 standard beam groups; m1 is a natural number greater than 1; acquiring optimal channel correlation factors among a plurality of antenna panels corresponding to each group in M1 standard beam groups, and combining each group in M1 standard beam groups with the corresponding optimal channel correlation factors to obtain M1 candidate first-stage codebooks; and selecting the M1 candidate first-stage codebooks in a broadband domain and a subband domain to obtain the optimal first-stage codebook. According to the technical scheme provided by the embodiment of the application, the terminal is communicated with the base station, and the terminal sequentially determines the optimal first-level codebook in the power domain, the broadband domain and the sub-band domain to provide the optimal first-level codebook for the base station under the condition that the base station comprises a plurality of antenna panels in the horizontal direction, so that the complexity of implementation is reduced, and the communication performance is ensured.
The embodiment of the application also provides a terminal, wherein the terminal is communicated with the base station, and the base station comprises a plurality of antenna panels in the horizontal direction. Fig. 4 is a first schematic structural diagram of a terminal according to an embodiment of the present application. As shown in fig. 4, the terminal includes:
a determining module 401, configured to obtain a wideband channel correlation matrix, and determine a polarization channel correlation matrix according to the wideband channel correlation matrix;
a selecting module 402, configured to select, in a power domain, multiple standard beam groups by using the polarization channel correlation matrix, so as to obtain M1 standard beam groups; m1 is a natural number greater than 1;
a combination module 403, configured to obtain channel correlation factors between the multiple antenna panels corresponding to each group in the M1 standard beam groups, and combine each group in the M1 standard beam groups with the corresponding channel correlation factor to obtain M1 candidate first-stage codebooks;
the selecting module 402 is further configured to select the M1 candidate first-level codebooks in a wideband domain and a subband domain to obtain an optimal first-level codebook.
Optionally, the determining module 401 is specifically configured to obtain, from the wideband channel correlation matrix, a first channel correlation matrix corresponding to a first polarization direction and a second channel correlation matrix corresponding to a second polarization direction; and determining the sum of the first channel correlation matrix and the second channel correlation matrix as the polarization channel correlation matrix.
Optionally, the selecting module 402 is specifically configured to determine, by using the polarization channel correlation matrix, a channel power corresponding to each beam in the plurality of standard beam groups; determining a channel power sum corresponding to each group in the plurality of standard beam groups according to the channel power; sequencing the plurality of standard beam groups according to the corresponding channel power sum from large to small to obtain a beam group sequence; and selecting the first standard beam group to the M1 th standard beam group from the beam group sequence to obtain the M1 standard beam groups.
Optionally, the combining module 403 is specifically configured to obtain a first correlation factor candidate set; the first correlation factor candidate set comprises a plurality of preset factors for measuring the channel correlation among different antenna panels; for each of the M1 standard beam groups, selecting an optimal channel correlation factor of each non-reference panel of the multiple antenna panels with respect to a preset reference panel from the first correlation factor candidate set, and forming an optimal channel correlation factor between the corresponding multiple antenna panels; the non-reference panel is an antenna panel different from the preset reference panel in the plurality of antenna panels.
Optionally, the combining module 403 is specifically configured to, for a first standard beam group, respectively calculate a corresponding first power value when each factor in the first correlation factor candidate set is used as a channel correlation factor of a first non-reference panel relative to the preset reference panel, so as to obtain a first power value set; the first standard beam group is any one of the M1 standard beam groups, and the first non-reference panel is any one of the plurality of antenna panels; selecting a maximum power value from the first power value set; and determining a factor corresponding to the maximum power value in the first correlation factor candidate set as an optimal channel correlation factor of the first non-reference panel corresponding to the first standard beam group relative to the preset reference panel.
Optionally, the selecting module 402 is specifically configured to obtain a second correlation factor candidate set; the second correlation factor candidate set comprises a plurality of preset factors for measuring the channel correlation between the beams in two different polarization directions at the same physical position; combining each codebook in the M1 candidate first-stage codebooks with each factor in the second correlation factor candidate set to obtain a plurality of first precoding matrixes; based on the plurality of first precoding matrixes, selecting the M1 candidate first-level codebooks in a broadband domain to obtain M2 candidate first-level codebooks; m2 is a natural number greater than 1 and equal to or less than M1; combining each codebook in the M2 candidate first-stage codebooks with each factor in the second correlation factor candidate set to obtain a plurality of second precoding matrixes; and selecting the M2 candidate first-stage codebooks in the subband domain based on the plurality of second precoding matrixes to obtain the optimal first-stage codebook.
Optionally, the selecting module 402 is specifically configured to determine, according to the wideband channel correlation matrix, an equivalent channel matrix corresponding to each matrix in the multiple first precoding matrices, so as to obtain multiple equivalent channel matrices; determining broadband information corresponding to each matrix in the equivalent channel matrixes; the broadband information is a broadband determinant value or a broadband capacity value; sequencing the plurality of first pre-coding matrixes from large to small according to corresponding broadband information to obtain a first matrix sequence; selecting a first precoding matrix to an Nth precoding matrix from the first matrix sequence to obtain N precoding matrices; n is a natural number greater than 1; and selecting each codebook forming the N precoding matrixes from the M1 candidate first-stage codebooks to obtain the M2 candidate first-stage codebooks.
Optionally, the selecting module 402 is specifically configured to determine a sum of subband mutual information corresponding to each of the multiple second precoding matrices; determining corresponding sub-band mutual information and the largest pre-coding matrix in the plurality of second pre-coding matrixes as a target pre-coding matrix; and selecting a codebook forming the target precoding matrix from the M2 candidate first-stage codebooks to obtain the optimal first-stage codebook.
Fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application. As shown in fig. 5, includes: a processor 501, a memory 502, and a communication bus 503;
the communication bus 503 is used for realizing communication connection between the processor 501 and the memory 502;
the processor 501 is configured to execute the codebook determination method stored in the memory 502 to implement the codebook determination method.
Fig. 6 is a third schematic structural diagram of a terminal according to an embodiment of the present application. As shown in fig. 6, for the terminal, it may include a radio frequency front end processing module 601, a cell search module 602, a channel estimation module 603, a demodulation module 604, a decoding module 605, and a channel measurement feedback module 606. The radio frequency front-end processing module 601 is configured to perform digital front-end processing on an acquired signal, the cell search module 602 is configured to perform cell search, the channel estimation module 603 is configured to perform channel estimation, the demodulation module 604 is configured to perform signal demodulation, and the decoding module 605 is configured to decode a demodulation result to obtain a decoding result. For channel measurement feedback module 606, it includes: a channel whitening module 6061, a reference signal resource selection module 6062, a rank indication module 6063, a precoding matrix indication module 6064, and a channel quality indication module 6065. The codebook determining method provided in the embodiment of the present application is specifically implemented by a precoding matrix indication module 6064 of a terminal.
The embodiment of the application provides a terminal, wherein the terminal is communicated with a base station, the base station comprises a plurality of antenna panels in the horizontal direction, and the terminal acquires a broadband channel correlation matrix and determines a polarization channel correlation matrix according to the broadband channel correlation matrix; selecting a plurality of standard beam groups in a power domain by utilizing a polarization channel correlation matrix to obtain M1 standard beam groups; m1 is a natural number greater than 1; acquiring optimal channel correlation factors among a plurality of antenna panels corresponding to each group in M1 standard beam groups, and combining each group in M1 standard beam groups with the corresponding optimal channel correlation factors to obtain M1 candidate first-stage codebooks; and selecting the M1 candidate first-stage codebooks in a broadband domain and a subband domain to obtain the optimal first-stage codebook. The terminal provided by the embodiment of the application is communicated with the base station, and under the condition that the base station comprises a plurality of antenna panels in the horizontal direction, the terminal sequentially determines the optimal first-level codebook in a power domain, a broadband domain and a subband domain so as to provide the optimal first-level codebook for the base station, so that the complexity of implementation is reduced, and the communication performance is ensured.
An embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the codebook determination method described above. The computer-readable storage medium may be a volatile Memory (volatile Memory), such as a Random-Access Memory (RAM); or a non-volatile Memory (non-volatile Memory), such as a Read-Only Memory (ROM), a flash Memory (flash Memory), a Hard Disk (Hard Disk Drive, HDD) or a Solid-State Drive (SSD); or may be a respective device, such as a mobile phone, computer, tablet device, personal digital assistant, etc., that includes one or any combination of the above-mentioned memories.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of implementations of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks and/or flowchart block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks in the flowchart and/or block diagram block or blocks.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (7)

1. A codebook determination method applied to a terminal, the terminal communicating with a base station, the base station including a plurality of antenna panels in a horizontal direction, the method comprising:
acquiring a broadband channel correlation matrix, and determining a polarization channel correlation matrix according to the broadband channel correlation matrix;
determining the channel power corresponding to each beam in a plurality of standard beam groups by using the polarization channel correlation matrix;
determining a channel power sum corresponding to each group in the plurality of standard beam groups according to the channel power;
sequencing the plurality of standard beam groups according to the corresponding channel power sum from large to small to obtain a beam group sequence;
selecting a first standard beam group to an M1 th standard beam group from the beam group sequence to obtain M1 standard beam groups; m1 is a natural number greater than 1;
obtaining optimal channel correlation factors among the antenna panels corresponding to each group in the M1 standard beam groups, and combining each group in the M1 standard beam groups with the corresponding optimal channel correlation factors to obtain M1 candidate first-stage codebooks;
acquiring a second correlation factor candidate set; the second correlation factor candidate set comprises a plurality of preset factors for measuring the channel correlation between the beams in two different polarization directions at the same physical position;
combining each codebook in the M1 candidate first-stage codebooks with each factor in the second correlation factor candidate set to obtain a plurality of first precoding matrixes;
determining an equivalent channel matrix corresponding to each matrix in the plurality of first precoding matrices according to the broadband channel correlation matrix to obtain a plurality of equivalent channel matrices;
determining broadband information corresponding to each matrix in the equivalent channel matrixes; the broadband information is a broadband determinant value or a broadband capacity value;
sequencing the plurality of first pre-coding matrixes from large to small according to corresponding broadband information to obtain a first matrix sequence;
selecting a first precoding matrix to an Nth precoding matrix from the first matrix sequence to obtain N precoding matrices; n is a natural number greater than 1;
selecting each codebook forming the N precoding matrixes from the M1 candidate first-stage codebooks to obtain M2 candidate first-stage codebooks; m2 is a natural number greater than 1 and equal to or less than M1;
combining each codebook in the M2 candidate first-stage codebooks with each factor in the second correlation factor candidate set to obtain a plurality of second precoding matrixes;
determining the sum of the sub-band mutual information corresponding to each matrix in the plurality of second pre-coding matrixes;
determining corresponding sub-band mutual information and the largest pre-coding matrix in the plurality of second pre-coding matrixes as a target pre-coding matrix;
and selecting the codebook forming the target precoding matrix from the M2 candidate first-stage codebooks to obtain an optimal first-stage codebook.
2. The method of claim 1, wherein determining a polarization channel correlation matrix from the wideband channel correlation matrix comprises:
acquiring a first channel correlation matrix corresponding to a first polarization direction and a second channel correlation matrix corresponding to a second polarization direction from the broadband channel correlation matrix;
and determining the sum of the first channel correlation matrix and the second channel correlation matrix as the polarization channel correlation matrix.
3. The method of claim 1, wherein the obtaining the optimal channel correlation factor between the plurality of antenna panels corresponding to each of the M1 standard beam groups comprises:
acquiring a first correlation factor candidate set; the first correlation factor candidate set comprises a plurality of preset factors for measuring the channel correlation among different antenna panels;
for each of the M1 standard beam groups, selecting an optimal channel correlation factor of each non-reference panel of the multiple antenna panels with respect to a preset reference panel from the first correlation factor candidate set, and forming an optimal channel correlation factor between the corresponding multiple antenna panels;
the non-reference panel is an antenna panel different from the preset reference panel in the plurality of antenna panels.
4. The method of claim 3, wherein said selecting an optimal channel correlation factor for each non-reference panel of the plurality of antenna panels relative to a preset reference panel from the first candidate set of correlation factors for each of the M1 standard groups of beams, respectively, comprises:
aiming at a first standard beam group, respectively calculating a corresponding first power value under the condition that each factor in the first correlation factor candidate set is used as a channel correlation factor of a first non-reference panel relative to a preset reference panel, so as to obtain a first power value set; the first standard beam group is any one of the M1 standard beam groups, and the first non-reference panel is any one of the plurality of antenna panels;
selecting a maximum power value from the first power value set;
and determining a factor corresponding to the maximum power value in the first correlation factor candidate set as an optimal channel correlation factor of the first non-reference panel corresponding to the first standard beam group relative to the preset reference panel.
5. A terminal, wherein the terminal is in communication with a base station, wherein the base station comprises a plurality of antenna panels in a horizontal direction, and wherein the terminal comprises:
the determining module is used for acquiring a broadband channel correlation matrix and determining a polarization channel correlation matrix according to the broadband channel correlation matrix;
a selection module, configured to determine, by using the polarization channel correlation matrix, a channel power corresponding to each beam in a plurality of standard beam groups; determining a channel power sum corresponding to each group in the plurality of standard beam groups according to the channel power; sequencing the plurality of standard beam groups according to the corresponding channel power sum from large to small to obtain a beam group sequence; selecting a first standard beam group to an M1 th standard beam group from the beam group sequence to obtain M1 standard beam groups; m1 is a natural number greater than 1;
the combination module is used for acquiring channel correlation factors among the plurality of antenna panels corresponding to each group in the M1 standard beam groups, and combining each group in the M1 standard beam groups with the corresponding channel correlation factors to obtain M1 candidate first-stage codebooks;
the selection module is further used for acquiring a second correlation factor candidate set; the second correlation factor candidate set comprises a plurality of preset factors for measuring the channel correlation between the beams in two different polarization directions at the same physical position; combining each codebook in the M1 candidate first-stage codebooks with each factor in the second correlation factor candidate set to obtain a plurality of first precoding matrixes; determining an equivalent channel matrix corresponding to each matrix in the plurality of first precoding matrices according to the broadband channel correlation matrix to obtain a plurality of equivalent channel matrices; determining broadband information corresponding to each matrix in the equivalent channel matrixes; the broadband information is a broadband determinant value or a broadband capacity value; sequencing the plurality of first pre-coding matrixes from large to small according to corresponding broadband information to obtain a first matrix sequence; selecting a first precoding matrix to an Nth precoding matrix from the first matrix sequence to obtain N precoding matrices; n is a natural number greater than 1; selecting each codebook forming the N precoding matrixes from the M1 candidate first-stage codebooks to obtain M2 candidate first-stage codebooks; m2 is a natural number greater than 1 and equal to or less than M1; combining each codebook in the M2 candidate first-stage codebooks with each factor in the second correlation factor candidate set to obtain a plurality of second precoding matrixes; determining the sum of the sub-band mutual information corresponding to each matrix in the plurality of second pre-coding matrixes; determining corresponding sub-band mutual information and the largest pre-coding matrix in the plurality of second pre-coding matrixes as a target pre-coding matrix; and selecting the codebook forming the target precoding matrix from the M2 candidate first-stage codebooks to obtain an optimal first-stage codebook.
6. A terminal, comprising: a processor, a memory, and a communication bus;
the communication bus is used for realizing communication connection between the processor and the memory;
the processor is configured to execute the codebook determination method stored in the memory to implement the codebook determination method of any one of claims 1 to 4.
7. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the codebook determination method as defined in any one of claims 1 to 4.
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