NTN precoding method and device

Abstract

The invention relates to an NTN precoding method and device, and the method comprises the steps: determining a group of maximum orthogonal basis vectors corresponding to a maximum energy beam according to a channel condition, and selecting L strongest orthogonal beams from the maximum orthogonal basis vectors; performing linear amplitude quantization adjustment on the L strongest orthogonal beams by using the spatial correlation of a broadband channel, so that the L strongest orthogonal beams are converted into singular vectors of a width channel matched with the characteristics of the broadband channel; adjusting the linear amplitude combination of the broadband beam based on the spatial correlation of the narrowband channel to adapt to the condition of each narrowband, and generating a singular vector of the narrowband channel; generating corresponding precoding matrix indicator feedback information by combining the obtained singular vector of the width channel, the singular vector of the narrowband channel and the L strongest orthogonal beams according to the control information configuration information; the control information configuration information is used for representing the form of the antenna. According to the method, the feedback data volume can be obviously reduced on the premise of keeping the feedback accuracy.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to an NTN precoding method and device. Background Art

[0002] In order to overcome the limitations of traditional wireless communication ground networks, expand network coverage to natural spaces such as oceans, air and land, and achieve the goal of "integration of air, space, sea and land", the development of non-terrestrial networks (NTN) has become a mainstream trend. Massive MIMO technology provides significant advantages for NTN, including higher spectrum efficiency, wider coverage, lower latency and stronger anti-interference capabilities, which are all key elements necessary to build efficient and reliable non-terrestrial communication systems.

[0003] Although dual-polarized antennas can effectively improve channel capacity and combat multipath fading, their application in NTN still faces some challenges, such as isolation between ports, limitations on antenna size and weight, and unfavorable factors such as polarization rotation. Therefore, many current NTN systems still tend to use single-polarized antennas to avoid these potential problems.

[0004] In the current 3GPP protocol, two main types of codebooks are defined: Type I and Type II. Type I codebooks are suitable for smaller antenna arrays, usually provide fewer beam direction options, and are based on discrete Fourier Transform (DFT) vectors. In contrast, Type II codebooks are designed for large-scale MIMO systems, provide more beam direction options, and enable more refined beamforming control. However, these two codebooks are mainly designed for terrestrial communication scenarios, especially in dual-polarized antenna applications. When applied to single-polarized antennas in NTNs, especially in large-scale MIMO scenarios, these codebooks may introduce excessive and unnecessary feedback overhead, thereby affecting the efficiency and performance of the system. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an NTN precoding method and device, which can significantly reduce the amount of feedback data while maintaining feedback accuracy.

[0006] The technical solution adopted by the present invention to solve the technical problem is: to provide an NTN precoding method, comprising the following steps:

[0007] Determine a set of maximum orthogonal basis vectors corresponding to the maximum energy beam according to the channel conditions, and select L strongest orthogonal beams from them;

[0008] Utilizing the spatial correlation of the broadband channel, the L strongest orthogonal beams are subjected to linear amplitude quantization adjustment to convert them into singular vectors of a wideband channel matching the broadband channel characteristics;

[0009] Based on the spatial correlation of narrowband channels, the linear amplitude combination of broadband beams is adjusted to adapt to the conditions of each narrowband and generate singular vectors of narrowband channels;

[0010] According to the control information configuration information, the obtained singular vectors of the wideband channel, the singular vectors of the narrowband channel and the L strongest orthogonal beams are combined to generate corresponding precoding matrix indicator feedback information; the control information configuration information is used to characterize the form of the antenna.

[0011] When the control information configuration information is the first value, it indicates that the antenna is a single-polarized antenna, and the precoding matrix indicator feedback information includes the bearer broadband parameter i 1 and the carrying narrowband parameter i 2 ; The bearer broadband parameter i 1 Expressed as: i 1 =[i 1,1 i 1,2 i 1,3,1 i 1,4,1 ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,1 represents the maximum parameter beam of each layer of the single-polarized antenna in any direction, i 1,4,1 Represents the broadband amplitude adjustment coefficient of each layer of the single-polarized antenna in any direction; the carrier narrowband parameter i 2 Expressed as: i 2 =[i 2,1，1 i 2,2，1 ], where i 2,1,1 represents the narrowband phase coefficient of a single-polarized antenna in any direction, i 2,2,1 Represents the narrowband amplitude coefficient of a single-polarized antenna in any direction.

[0012] When the control information configuration information is the second value, it indicates that the antenna is a dual-polarized antenna, and the precoding matrix indicator feedback information includes the bearer broadband parameter i 1 and the carrying narrowband parameter i 2 ; The bearer broadband parameter i 1 Expressed as: i 1 =[i 1,1 i 1,2 i 1,3,l i 1,4,l ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i1,3,l represents the maximum parameter beam of each layer, i 1,4,l Indicates the broadband amplitude adjustment coefficient of each layer; the carrying narrowband parameter i 2 Expressed as: i 2 =[i 2,1,l i 2,2,l ], where i 2,1,l represents the narrowband phase coefficient, i 2,2,l Represents the narrowband amplitude coefficient.

[0013] The technical solution adopted by the present invention to solve the technical problem is: to provide an NTN precoding device, including:

[0014] A screening module, used to determine a set of maximum orthogonal basis vectors corresponding to the maximum energy beam according to the channel conditions, and select L strongest orthogonal beams therefrom;

[0015] A wide channel module, used to utilize the spatial correlation of the wideband channel to quantize the linear amplitude of the L strongest orthogonal beams, so as to convert them into singular vectors of the wide channel matching the characteristics of the wideband channel;

[0016] A narrowband channel module is used to adjust the linear amplitude combination of the wideband beam based on the spatial correlation of the narrowband channel to adapt to the conditions of each narrowband and generate the singular vectors of the narrowband channel;

[0017] A generation module is used to generate corresponding precoding matrix indicator feedback information based on control information configuration information, combined with the obtained singular vectors of the wide channel, the singular vectors of the narrowband channel and the L strongest orthogonal beams; the control information configuration information is used to characterize the form of the antenna.

[0018] When the control information configuration information is a first value, indicating that the antenna is a single-polarized antenna, the precoding matrix indicator feedback information generated by the generating module includes the bearer broadband parameter i 1 and the carrying narrowband parameter i 2 ; The bearer broadband parameter i 1 Expressed as: i 1 =[i 1,1 i 1,2 i 1,3,1 i 1,4,1 ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,1 represents the maximum parameter beam of each layer of the single-polarized antenna in any direction, i 1,4,1 Represents the broadband amplitude adjustment coefficient of each layer of the single-polarized antenna in any direction; the carrier narrowband parameter i 2 Expressed as: i 2 =[i2,1，1 i 2,2，1 ], where i 2,1,1 represents the narrowband phase coefficient of a single-polarized antenna in any direction, i 2,2,1 Represents the narrowband amplitude coefficient of a single-polarized antenna in any direction.

[0019] When the control information configuration information is a second value, indicating that the antenna is a dual-polarized antenna, the precoding matrix indicator feedback information generated by the generating module includes the bearer broadband parameter i 1 and the carrying narrowband parameter i 2 ; The bearer broadband parameter i 1 Expressed as: i 1 =[i 1,1 i 1,2 i 1,3,l i 1,4,l ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,l represents the maximum parameter beam of each layer, i 1,4,l Indicates the broadband amplitude adjustment coefficient of each layer; the carrying narrowband parameter i 2 Expressed as: i 2 =[i 2,1,l i 2,2,l ], where i 2,1,l represents the narrowband phase coefficient, i 2,2,l Represents the narrowband amplitude coefficient.

[0020] The technical solution adopted by the present invention to solve its technical problem is: providing a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned NTN precoding method are implemented.

[0021] Beneficial Effects

[0022] Due to the adoption of the above-mentioned technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the present invention realizes the switching of codebook configuration by adding control information configuration to adapt to different antenna configurations, so that it can flexibly adapt to single-polarization and multi-polarization antenna configurations and realize seamless switching between codebooks. The present invention not only significantly reduces the feedback amount of PMI, but also greatly reduces the complexity of codebook index calculation, thereby improving the overall efficiency and performance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flowchart of the NTN precoding method according to the first embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0025] The first embodiment of the present invention relates to a NTN precoding method, such as Figure 1 As shown, the following steps are included:

[0026] Step 1: determine a set of maximum orthogonal basis vectors corresponding to the maximum energy beam according to the channel conditions, and select L strongest orthogonal beams from them;

[0027] Step 2, utilizing the spatial correlation of the wideband channel to perform quantized linear amplitude adjustment on the L strongest orthogonal beams to convert them into singular vectors of a wideband channel matching the characteristics of the wideband channel;

[0028] Step 3, based on the spatial correlation of the narrowband channel, the linear amplitude combination of the wideband beam is adjusted to adapt to the conditions of each narrowband, and the singular vectors of the narrowband channel are generated;

[0029] The final formula presentation of the above three steps can be expressed as: Among them, W r is the codebook form, r represents the polarization direction, represents the DFT beam, Indicates the broadband and narrowband amplitude values, c r,i Represents the phase coefficient.

[0030] Step 4: generate corresponding precoding matrix indicator (PMI) feedback information based on the obtained singular vectors of the wideband channel, the singular vectors of the narrowband channel, and the L strongest orthogonal beams according to the control information configuration information; the control information configuration information is used to characterize the form of the antenna.

[0031] In order to support the requirements of the above codebook design, the PMI feedback information in this step mainly includes two parts: carrying broadband parameters i 1 and the carrying narrowband parameter i 2. In the NTN single-polarization scenario, directly using the existing solution is not conducive to improving system efficiency, both in terms of the complexity of precoding matrix index calculation and the amount of feedback information. Therefore, this step implements the switching of codebook configuration to adapt to different antenna configurations by adding control information configuration (Polarization Indicator) information. In this step, Q has different values ​​according to different configurations of control information configuration information. When Polarization Indicator = 1 (that is, the antenna is a single-polarization antenna), Q = 1, and when Polarization Indicator = 2 (that is, the antenna is a dual-polarization antenna), Q = 2.

[0032] In this step, when Q=1, the bearer bandwidth parameter i in the PMI feedback information 1 It is expressed as: Among them, i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,1 represents the maximum parameter beam of each layer of the single-polarized antenna in any direction, i 1,4,1 Indicates the broadband amplitude adjustment coefficient of each layer of the single-polarized antenna in any direction; the bearer narrowband parameter i in the PMI feedback information 2 It is expressed as: Among them, i 2,1,1 represents the narrowband phase coefficient of a single-polarized antenna in any direction, i 2,2,1 Represents the narrowband amplitude coefficient of a single-polarized antenna in any direction.

[0033] In this step, when Q=2, the bearer bandwidth parameter i in the PMI feedback information 1 Expressed as: i 1 =[i 1,1 i 1,2 i 1,3,l i 1,4,l ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,l represents the maximum parameter beam of each layer, i 1,4,l Indicates the broadband amplitude adjustment coefficient of each layer; the bearer narrowband parameter i in the PMI feedback information 2 Expressed as: i 2 =[i 2,1,l i 2,2,l ], where i 2,1,l represents the narrowband phase coefficient, i 2,2,l Represents the narrowband amplitude coefficient.

[0034] It is not difficult to find that the codebook-based precoding design scheme proposed in this implementation for the NTN scenario can flexibly adapt to single-polarization and multi-polarization antenna configurations and achieve seamless switching between codebooks.

[0035] With the antenna N in the horizontal direction 1 =4, vertical antenna N 2 =4, number of subbands N 3 =10, the number of beams L=4, and the rank Rank=1 are taken as an example. The number of PMI feedback information generated based on the existing solution is as follows:

[0036]

[0037] The number of feedbacks of the PMI feedback information generated based on the method in this implementation is as follows:

[0038]

[0039] It can be seen that compared with the existing method, the PMI feedback information generated by the method of this embodiment can reduce the feedback amount of 185 bits in this scenario. Therefore, the method of this embodiment can significantly reduce the feedback amount of PMI feedback information, thereby greatly reducing the complexity of codebook index calculation and improving the overall efficiency and performance of the system.

[0040] A second embodiment of the present invention relates to an NTN precoding device, comprising:

[0041] A screening module, used to determine a set of maximum orthogonal basis vectors corresponding to the maximum energy beam according to the channel conditions, and select L strongest orthogonal beams therefrom;

[0042] A wide channel module, used to utilize the spatial correlation of the wideband channel to quantize the linear amplitude of the L strongest orthogonal beams, so as to convert them into singular vectors of the wide channel matching the characteristics of the wideband channel;

[0043] A narrowband channel module is used to adjust the linear amplitude combination of the wideband beam based on the spatial correlation of the narrowband channel to adapt to the conditions of each narrowband and generate the singular vectors of the narrowband channel;

[0044] A generation module is used to generate corresponding precoding matrix indicator feedback information based on control information configuration information, combined with the obtained singular vectors of the wide channel, the singular vectors of the narrowband channel and the L strongest orthogonal beams; the control information configuration information is used to characterize the form of the antenna.

[0045] When the control information configuration information is a first value, indicating that the antenna is a single-polarized antenna, the precoding matrix indicator feedback information generated by the generating module includes the bearer broadband parameter i 1and the carrying narrowband parameter i 2 ; The bearer broadband parameter i 1 Expressed as: i 1 =[i 1,1 i 1,2 i 1,3,1 i 1,4,1 ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,1 represents the maximum parameter beam of each layer of the single-polarized antenna in any direction, i 1,4,1 Represents the broadband amplitude adjustment coefficient of each layer of the single-polarized antenna in any direction; the carrier narrowband parameter i 2 Expressed as: i 2 =[i 2,1，1 i 2,2，1 ], where i 2,1,1 represents the narrowband phase coefficient of a single-polarized antenna in any direction, i 2,2,1 Represents the narrowband amplitude coefficient of a single-polarized antenna in any direction.

[0046] When the control information configuration information is a second value, indicating that the antenna is a dual-polarized antenna, the precoding matrix indicator feedback information generated by the generating module includes the bearer broadband parameter i 1 and the carrying narrowband parameter i 2 ; The bearer broadband parameter i 1 Expressed as: i 1 =[i 1,1 i 1,2 i 1,3,l i 1,4,l ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,l represents the maximum parameter beam of each layer, i 1,4,l Indicates the broadband amplitude adjustment coefficient of each layer; the carrying narrowband parameter i 2 Expressed as: i 2 =[i 2,1,l i 2,2,l ], where i 2,1,l represents the narrowband phase coefficient, i 2,2,l Represents the narrowband amplitude coefficient.

[0047] A third embodiment of the present invention relates to a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the NTN precoding method of the first embodiment are implemented.

Claims

1. A NTN precoding method, characterized in that: The following steps are involved: Determine a set of maximum orthogonal basis vectors corresponding to the maximum energy beam according to the channel conditions, and select L strongest orthogonal beams from them; Utilizing the spatial correlation of the broadband channel, the L strongest orthogonal beams are subjected to linear amplitude quantization adjustment to convert them into singular vectors of a wideband channel matching the broadband channel characteristics; Based on the spatial correlation of narrowband channels, the linear amplitude combination of broadband beams is adjusted to adapt to the conditions of each narrowband. Generate singular vectors of narrowband channels; According to the control information configuration information, the obtained singular vectors of the wideband channel, the singular vectors of the narrowband channel, and the L strongest orthogonal beams are combined to generate corresponding precoding matrix indicator feedback information; The control information configuration information is used to characterize the form of the antenna.

2. The NTN precoding method according to claim 1, characterized in that: When the control information configuration information is the first value, it indicates that the antenna is a single-polarized antenna, and the precoding matrix indicator feedback information includes a bearer broadband parameter i1 and a bearer narrowband parameter i2; the bearer broadband parameter i1 is expressed as: i1=[i 1,1 i 1,2 i 1,3,1 i 1,4,1 ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,1 represents the maximum parameter beam of each layer of the single-polarized antenna in any direction, i 1,4,1 represents the broadband amplitude adjustment coefficient of each layer of the single-polarized antenna in any direction; the carrying narrowband parameter i2 is expressed as: i2 = [i 2,1，1 i 2,2，1 ], where i 2,1,1 represents the narrowband phase coefficient of a single-polarized antenna in any direction, i 2,2,1 Represents the narrowband amplitude coefficient of a single-polarized antenna in any direction.

3. The NTN precoding method according to claim 1, characterized in that: When the control information configuration information is the second value, it indicates that the antenna is a dual-polarized antenna, and the precoding matrix indicator feedback information includes a bearer broadband parameter i1 and a bearer narrowband parameter i2; the bearer broadband parameter i1 is expressed as: i1=[i 1,1 i 1,2 i 1,3,l i 1,4,l ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,l represents the maximum parameter beam of each layer, i 1,4,l Indicates the broadband amplitude adjustment coefficient of each layer; the bearer narrowband parameter i2 is expressed as: i2 = [i 2,1,l i 2,2,l ], where i 2,1,l represents the narrowband phase coefficient, i 2,2,l Represents the narrowband amplitude coefficient.

4. An NTN precoding device, characterized in that: include: A screening module, used to determine a set of maximum orthogonal basis vectors corresponding to the maximum energy beam according to the channel conditions, and select L strongest orthogonal beams therefrom; A wide channel module, used to utilize the spatial correlation of the wideband channel to quantize the linear amplitude of the L strongest orthogonal beams, so as to convert them into singular vectors of the wide channel matching the characteristics of the wideband channel; A narrowband channel module is used to adjust the linear amplitude combination of the wideband beam based on the spatial correlation of the narrowband channel to adapt to the conditions of each narrowband and generate the singular vectors of the narrowband channel; A generating module, configured to generate corresponding precoding matrix indicator feedback information according to the control information configuration information, combining the obtained singular vectors of the wideband channel, the singular vectors of the narrowband channel and the L strongest orthogonal beams; The control information configuration information is used to characterize the form of the antenna.

5. The NTN precoding device according to claim 1, characterized in that: When the control information configuration information is the first value, indicating that the antenna is a single-polarized antenna, the precoding matrix indicator feedback information generated by the generating module includes a bearer broadband parameter i1 and a bearer narrowband parameter i2; the bearer broadband parameter i1 is expressed as: i1=[i 1,1 i 1,2 i 1,3, 1i 1,4,1 ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,1 represents the maximum parameter beam of each layer of the single-polarized antenna in any direction, i 1,4,1 represents the broadband amplitude adjustment coefficient of each layer of the single-polarized antenna in any direction; the carrying narrowband parameter i2 is expressed as: i2 = [i 2,1，1 i 2,2，1 ], where i 2,1,1 represents the narrowband phase coefficient of a single-polarized antenna in any direction, i 2,2,1 Represents the narrowband amplitude coefficient of a single-polarized antenna in any direction.

6. The NTN precoding device according to claim 1, characterized in that: When the control information configuration information is the second value, indicating that the antenna is a dual-polarized antenna, the precoding matrix indicator feedback information generated by the generating module includes a bearer broadband parameter i1 and a bearer narrowband parameter i2; the bearer broadband parameter i1 is expressed as: i1=[i 1,1 i 1,2 i 1,3,l i 1,4,l ], where i 1,1 represents the oversampled orthogonal basis, i 1,2 represents L orthogonal beams, i 1,3,l represents the maximum parameter beam of each layer, i 1,4,l Indicates the broadband amplitude adjustment coefficient of each layer; the bearer narrowband parameter i2 is expressed as: i2 = [i 2,1,l i 2,2,l ], where i 2,1,l represents the narrowband phase coefficient, i 2,2,l Represents the narrowband amplitude coefficient.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the NTN precoding method according to any one of claims 1 to 3 are implemented.

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