WO2019233340A1 - 信道状态信息反馈方法、预编码矩阵确定方法及装置 - Google Patents

信道状态信息反馈方法、预编码矩阵确定方法及装置 Download PDF

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Publication number
WO2019233340A1
WO2019233340A1 PCT/CN2019/089337 CN2019089337W WO2019233340A1 WO 2019233340 A1 WO2019233340 A1 WO 2019233340A1 CN 2019089337 W CN2019089337 W CN 2019089337W WO 2019233340 A1 WO2019233340 A1 WO 2019233340A1
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Prior art keywords
orthogonal
precoding matrix
layers
group
vector
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PCT/CN2019/089337
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English (en)
French (fr)
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李辉
高秋彬
拉盖施
陈润华
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电信科学技术研究院有限公司
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Priority claimed from CN201910117823.5A external-priority patent/CN110581724B/zh
Application filed by 电信科学技术研究院有限公司 filed Critical 电信科学技术研究院有限公司
Priority to EP19815456.9A priority Critical patent/EP3806346A4/en
Priority to US16/973,056 priority patent/US11190257B2/en
Publication of WO2019233340A1 publication Critical patent/WO2019233340A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

Definitions

  • the present application relates to the field of wireless communication technologies, and in particular, to a channel state information feedback method, a precoding matrix determination method, and a device.
  • Type I type I codebook
  • Type II type II codebook
  • the Type I codebook is based on beam selection and phase adjustment, and its feedback overhead is small, and the quantization accuracy of the channel is low.
  • the Type II codebook is based on the linear combination of orthogonal beams, which has a large feedback overhead and high channel quantization. Precision.
  • the TypeII codebook is based on the linear combination of the beams in the orthogonal beam group, and supports rank1 codebook and rank2 codebook.
  • rank1 means that the rank of the transmission channel is equal to 1, which means that it is transmitted using one data layer
  • rank2 means that the rank of the transmission channel is equal to 2, which means that it is transmitted using two data layers.
  • the rank1 codebook is expressed as:
  • the rank2 codebook is expressed as:
  • L is the number of orthogonal beams in the group
  • a wideband amplitude quantization factor acting on beam i, polarization direction r, and layer l in an orthogonal beam group Represents the subband amplitude quantization factors that act on beam i, polarization direction r, and layer l in the orthogonal beam group
  • c r, l, i indicates that the Subband phase quantization factor.
  • the number of antenna ports that this codebook structure can support is ⁇ 4,8,12,16,24,32 ⁇ .
  • the Type II codebook needs to determine an orthogonal beam group.
  • Each layer independently linearly combines all the beams in this orthogonal beam group, and quantizes the amplitude and phase of the linear combination coefficient.
  • Embodiments of the present application provide a channel state information feedback method, a precoding matrix determination method, and a device.
  • a channel state information feedback method including: a terminal determining N orthogonal vector groups; and determining a linear merging coefficient for constructing the precoding matrix according to vectors in the N orthogonal vector groups.
  • the linear combination coefficient includes the linear combination coefficient corresponding to each layer in the precoding matrix; the terminal feeds back channel state information to the base station, and the channel state information includes indication information of the N orthogonal vector groups
  • the determined linear combination coefficients of Y layers in the linear combination coefficients of the precoding matrix where Y is less than or equal to the number of layers of the precoding matrix.
  • the beams in the same orthogonal vector group are mutually orthogonal.
  • One orthogonal vector group is used to construct the precoding corresponding to M layers in the precoding matrix, and different orthogonal vector groups are used to construct the corresponding corresponding layers in the precoding matrix.
  • Precoding, N and M are integers greater than or equal to 1.
  • the terminal determines N orthogonal vector groups, determines a linear combination coefficient corresponding to each layer in the precoding matrix according to the vectors in the N orthogonal vector groups, and feeds back channel state information to the base station.
  • the feedback information includes the indication information of the N orthogonal vector groups and the linear combination coefficients corresponding to the Y layers in the linear combination coefficients of the precoding matrix. Since Y can be smaller than the number of layers of the precoding matrix, the feedback overhead can be reduced.
  • vectors between the different orthogonal vector groups are mutually orthogonal.
  • the precoding of different polarization directions of the same layer is constructed based on the vectors in the same orthogonal vector group and using the same linear merging coefficient, for different poles of the same layer.
  • the precoding of the change direction only needs to determine and feedback the linear merging coefficient corresponding to one polarization direction in the layer, and it is not necessary to separately determine and feedback the linear merging coefficient for different polarization directions, so the feedback overhead can be reduced.
  • the orthogonality of the vectors between the layers corresponding to different groups of orthogonal vectors ensures mutual orthogonality between the layers.
  • the same polarization direction of different layers corresponds to the same or different linear merge coefficients, and the same layer
  • the different polarization directions of are corresponding to different linear merging coefficients, and the different layers are orthogonal to each other.
  • the same polarization direction of different layers may correspond to the same
  • the layers corresponding to different orthogonal vector groups pass the orthogonality between the vectors in the orthogonal vector group, so all layers in the precoding matrix can be realized. Orthogonal. Reduce inter-layer interference.
  • the channel state information further includes: phase adjustment factors corresponding to S layers in the precoding matrix determined by the terminal, where S is less than or equal to a layer of the precoding matrix number.
  • the linear combination coefficient includes the following parameters: an amplitude quantization factor, the amplitude quantization factor includes a wideband amplitude quantization factor and / or a subband amplitude quantization factor; a phase quantization factor, the phase quantization factor Including a wideband phase quantization factor and / or a subband phase quantization factor.
  • the number of vectors in each of the N orthogonal vector groups is the same or different.
  • the orthogonal vector group is an orthogonal beam group, and the orthogonal beam group includes at least one beam vector; or the orthogonal vector group is a frequency-domain base vector group, so The frequency-domain vector group includes at least one frequency-domain base vector.
  • the terminal determines a linear combination for constructing the precoding matrix according to the vectors in the N orthogonal vector groups.
  • the coefficient includes: the terminal determines S frequency-domain base vector groups, where S is an integer greater than or equal to 1; and the terminal determines the beam vectors in the N orthogonal beam groups and the S frequency-domain base vectors. Group to determine a linear merging coefficient used to construct the precoding matrix.
  • the frequency-domain base vectors in the frequency-domain base vector group used by the layer with the larger layer index are used from the layer with the smaller layer index. Selected from the frequency domain basis vector set.
  • the terminal determines, based on the vectors in the N frequency-domain base vector groups, a method for constructing the precoding matrix.
  • the linear combination coefficient includes: the terminal determines S beam groups, where S is an integer greater than or equal to 1; and the terminal determines whether to use the vectors according to the vectors in the N frequency-domain basis vector groups and the S beam groups.
  • a linear merging coefficient for constructing the precoding matrix is an integer greater than or equal to 1
  • a beam vector in a beam group used by a layer with a larger layer index is selected from a beam group used by a layer with a smaller layer index.
  • a method for determining a precoding matrix including: receiving, by a base station, channel state information fed back by a terminal, where the channel state information includes indication information of N orthogonal vector groups and determining the precoding used by the terminal to construct a precoding Among the linear combination coefficients of the matrix, the linear combination coefficients corresponding to the Y layers, the base station constructs the precoding matrix according to the channel state information.
  • Y is less than or equal to the number of layers of the precoding matrix
  • N orthogonal vector groups vectors in the same orthogonal vector group are orthogonal to each other, and one orthogonal vector group is used to construct M numbers in the precoding matrix
  • Precoding corresponding to layers different orthogonal vector groups construct precoding corresponding to different layers in the precoding matrix
  • N and M are integers greater than or equal to 1.
  • vectors between the different orthogonal vector groups are mutually orthogonal.
  • the same polarization direction of different layers corresponds to the same or different linear merge coefficients, and the same layer
  • the different polarization directions of are corresponding to different linear merging coefficients, and the different layers are orthogonal to each other.
  • the channel state information further includes: phase adjustment factors corresponding to S layers in the precoding matrix determined by the terminal, where S is less than or equal to a layer of the precoding matrix number.
  • the linear combination coefficient includes the following parameters: an amplitude quantization factor, the amplitude quantization factor includes a wideband amplitude quantization factor and / or a subband amplitude quantization factor; a phase quantization factor, the phase quantization factor Including a wideband phase quantization factor and / or a subband phase quantization factor.
  • the number of orthogonal beams in each of the N orthogonal beam groups is the same or different.
  • the orthogonal vector group is an orthogonal beam group, and the orthogonal beam group includes at least one beam vector; or the orthogonal vector group is a frequency-domain base vector group, so The frequency-domain vector group includes at least one frequency-domain base vector.
  • a terminal including: an orthogonal beam group determination module, configured to determine N orthogonal vector groups, where N is an integer greater than or equal to 1, wherein beams in the same orthogonal vector group are mutually orthogonal
  • An orthogonal vector group is used to construct precoding corresponding to M layers in the precoding matrix. Different orthogonal vector groups are used to construct precoding corresponding to different layers in the precoding matrix.
  • M is an integer greater than or equal to 1.
  • a linear merging coefficient determining module configured to determine a linear merging coefficient for constructing the precoding matrix according to the vectors in the N orthogonal vector groups; wherein the linear merging coefficient includes each of the precoding matrices; The linear merging coefficient corresponding to each layer.
  • a feedback module configured to feed back channel state information to the base station, where the channel state information includes indication information of the N orthogonal vector groups and a linear combination corresponding to Y layers in the determined linear combination coefficient of the precoding matrix Coefficient, where Y is less than or equal to the number of layers of the precoding matrix.
  • vectors between the different orthogonal vector groups are mutually orthogonal.
  • the same polarization direction of different layers corresponds to the same or different linear merge coefficients, and the same layer
  • the different polarization directions of are corresponding to different linear merging coefficients, and the different layers are orthogonal to each other.
  • the channel state information further includes: phase adjustment factors corresponding to S layers in the precoding matrix determined by the terminal, where S is less than or equal to a layer of the precoding matrix number.
  • the linear combination coefficient includes the following parameters: an amplitude quantization factor, the amplitude quantization factor includes a wideband amplitude quantization factor and / or a subband amplitude quantization factor; a phase quantization factor, the phase quantization factor Including a wideband phase quantization factor and / or a subband phase quantization factor.
  • the number of vectors in each of the N orthogonal vector groups is the same or different.
  • the orthogonal vector group is an orthogonal beam group, and the orthogonal beam group includes at least one beam vector; or the orthogonal vector group is a frequency-domain base vector group, so The frequency-domain vector group includes at least one frequency-domain base vector.
  • the linear combination coefficient determining module is specifically configured to determine S frequency-domain base vector groups, where S is an integer greater than or equal to 1. Determining a linear merging coefficient for constructing the precoding matrix according to the beam vectors in the N orthogonal beam groups and the S frequency domain base vector groups.
  • the frequency-domain base vectors in the frequency-domain base vector group used by the layer with the larger layer index are used from the layer with the smaller layer index. Selected from the frequency domain basis vector set.
  • the linear combination coefficient determination module is specifically configured to determine S beam groups, where S is an integer greater than or equal to 1; according to A vector in the N frequency-domain basis vector groups and the S beam groups determine a linear merging coefficient used to construct the precoding matrix.
  • a beam vector in a beam group used by a layer with a larger layer index is selected from a beam group used by a layer with a smaller layer index.
  • a base station including: a receiving module configured to receive channel state information fed back by a terminal, where the channel state information includes indication information of N orthogonal vector groups and a precoding determined by the terminal for constructing precoding The linear combination coefficient corresponding to Y layers in the linear combination coefficient of the matrix, where Y is less than or equal to the number of layers of the precoding matrix; wherein, among the N orthogonal vector groups, vectors in the same orthogonal vector group are mutually Orthogonal, the vectors between different orthogonal vector groups are mutually orthogonal, one orthogonal vector group is used to construct the precoding corresponding to M layers in the precoding matrix, and different orthogonal vector groups are used to construct the corresponding corresponding layers in different layers in the precoding matrix.
  • Precoding N and M are both integers greater than or equal to 1; a precoding matrix determining module is configured to construct the precoding matrix according to the channel state information.
  • vectors between the different orthogonal vector groups are mutually orthogonal.
  • the same polarization direction of different layers corresponds to the same or different linear merge coefficients, and the same layer
  • the different polarization directions of are corresponding to different linear merging coefficients, and the different layers are orthogonal to each other.
  • the channel state information further includes: phase adjustment factors corresponding to S layers in the precoding matrix determined by the terminal, where S is less than or equal to a layer of the precoding matrix number.
  • the linear combination coefficient includes the following parameters: an amplitude quantization factor, the amplitude quantization factor includes a wideband amplitude quantization factor and / or a subband amplitude quantization factor; a phase quantization factor, the phase quantization factor Including a wideband phase quantization factor and / or a subband phase quantization factor.
  • the number of orthogonal beams in each of the N orthogonal beam groups is the same or different.
  • the orthogonal vector group is an orthogonal beam group, and the orthogonal beam group includes at least one beam vector; or the orthogonal vector group is a frequency-domain base vector group, so The frequency-domain vector group includes at least one frequency-domain base vector.
  • a communication device including: a processor, a memory, and a transceiver; the processor is configured to read a program in the memory, and execute: determine N orthogonal vector groups, where N is greater than or An integer equal to 1; determining a linear merging coefficient for constructing the precoding matrix according to a vector in the N orthogonal vector groups, wherein the linear merging coefficient includes a corresponding value of each layer in the precoding matrix Linear combination coefficient; feedback channel state information to the base station through the transceiver, the channel state information includes indication information of the N orthogonal vector groups and Y layers of the linear combination coefficient of the precoding matrix determined Corresponding linear merging coefficient, where Y is less than or equal to the number of layers of the precoding matrix.
  • vectors in the same orthogonal vector group are orthogonal to each other.
  • One orthogonal vector group is used to construct precoding corresponding to M layers in the precoding matrix, and different orthogonal vector groups construct corresponding to different layers in the precoding matrix.
  • M is an integer greater than or equal to 1.
  • vectors between the different orthogonal vector groups are mutually orthogonal.
  • the same polarization direction of different layers corresponds to the same or different linear merging coefficients and the same layer.
  • the different polarization directions of are corresponding to different linear merging coefficients, and the different layers are orthogonal to each other.
  • the channel state information further includes: phase adjustment factors corresponding to S layers in the precoding matrix determined by the terminal, where S is less than or equal to a layer of the precoding matrix And the selection of S layers is pre-defined by the system or indicated to the terminal by higher layer signaling.
  • the linear combination coefficient includes the following parameters: an amplitude quantization factor, the amplitude quantization factor includes a wideband amplitude quantization factor and / or a subband amplitude quantization factor; a phase quantization factor, the phase quantization factor Including a wideband phase quantization factor and / or a subband phase quantization factor.
  • the number of vectors in each of the N orthogonal vector groups is the same or different.
  • the orthogonal vector group is an orthogonal beam group, and the orthogonal beam group includes at least one beam vector; or the orthogonal vector group is a frequency-domain base vector group, so The frequency-domain vector group includes at least one frequency-domain base vector.
  • the processor when the orthogonal vector group is an orthogonal beam group, the processor is specifically configured to: determine S frequency-domain base vector groups, where S is an integer greater than or equal to 1; The beam vectors in the N orthogonal beam groups and the S frequency-domain base vector groups are used to determine a linear merging coefficient for constructing the precoding matrix.
  • a beam vector in a beam group used by a layer with a larger layer index is selected from a beam group used by a layer with a smaller layer index.
  • the processor is specifically configured to: determine S beam groups, where S is an integer greater than or equal to 1; and according to the N A vector in the frequency domain basis vector group and the S beam groups determine a linear merging coefficient used to construct the precoding matrix.
  • a beam vector in a beam group used by a layer with a larger layer index is selected from a beam group used by a layer with a smaller layer index.
  • a communication device including: a processor, a memory, and a transceiver; the processor is configured to read a program in the memory, and execute: receiving the channel state information fed back by a terminal through the transceiver.
  • the channel state information includes indication information of N orthogonal vector groups and a linear combination coefficient corresponding to Y layers among linear combination coefficients determined by the terminal for constructing a precoding matrix, where Y is less than or equal to the The number of layers of the coding matrix; constructing the precoding matrix according to the channel state information.
  • the N orthogonal vector groups vectors in the same orthogonal vector group are orthogonal to each other.
  • One orthogonal vector group is used to construct precoding corresponding to M layers in the precoding matrix, and different orthogonal vector groups Construct precoding corresponding to different layers in the precoding matrix, where N and M are integers greater than or equal to 1.
  • vectors between the different orthogonal vector groups are mutually orthogonal.
  • the same polarization direction of different layers corresponds to the same or different linear merging coefficients and the same layer.
  • the different polarization directions of are corresponding to different linear merging coefficients, and the different layers are orthogonal to each other.
  • the channel state information further includes: phase adjustment factors corresponding to S layers in the precoding matrix determined by the terminal, where S is less than or equal to a layer of the precoding matrix number.
  • the linear combination coefficient includes the following parameters: an amplitude quantization factor, the amplitude quantization factor includes a wideband amplitude quantization factor and / or a subband amplitude quantization factor; a phase quantization factor, the phase quantization factor Including a wideband phase quantization factor and / or a subband phase quantization factor.
  • the number of vectors in each of the N orthogonal vector groups is the same or different.
  • the orthogonal vector group is an orthogonal beam group, and the orthogonal beam group includes at least one beam vector; or the orthogonal vector group is a frequency-domain base vector group, so The frequency-domain vector group includes at least one frequency-domain base vector.
  • a computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are configured to cause the computer to execute the operations described in any one of the first aspects above. The method described.
  • a computer-readable storage medium stores computer-executable instructions, where the computer-executable instructions are used to cause the computer to execute The method described.
  • FIG. 1 is a schematic diagram of a network architecture according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a candidate beam set in an embodiment of the present application.
  • FIG. 3 is a schematic flowchart of channel status information feedback according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • the current Type II codebook only supports rank1 and rank2, and does not support higher rank values.
  • rank1 codebook and rank2 codebook for example, for rank3 codebook, determine the linear combination coefficients of 3 layers independently and feedback, and for rank 4 codebook, determine 4 layers independently. Linearly merge the coefficients and feedback, the feedback overhead increases as the number of layers increases.
  • rank 4 codebook because the linear merging coefficients of each layer are determined independently, orthogonality cannot be guaranteed between layers, so data layer interference will occur during data transmission, affecting the performance of the system. This effect is even more pronounced when using high rank codebooks.
  • the embodiment of the present application proposes a channel state information feedback method, which can perform channel state information feedback based on a precoding matrix that is linearly combined with a beam, so that the base station can construct the precoding matrix according to the received channel state information.
  • the embodiments of the present application can support a higher rank, and can simultaneously take into account feedback overhead and reduce inter-layer interference.
  • FIG. 1 is a schematic diagram of a possible communication scenario provided by an embodiment of the present application.
  • the terminal 110 accesses a wireless network through a radio access network (RAN) node 120 to obtain services of an external network (such as the Internet) through the wireless network, or communicate with other terminals through the wireless network.
  • RAN radio access network
  • the terminal is also called user equipment (UE), mobile station (MS), mobile terminal (MT), etc., and is a device that provides voice and / or data connectivity to users ,
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • some examples of terminals are: mobile phones, tablet computers, laptops, handheld computers, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, and augmented reality (augmented reality) equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, and smart grids Wireless terminals, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and the like.
  • MID mobile internet devices
  • VR virtual reality
  • augmented reality augmented reality
  • RAN is the part of the network that connects the terminal to the wireless network.
  • a RAN node (or device) is a node (or device) in a radio access network, and may also be called a base station.
  • some examples of RAN nodes are: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), and node B (Node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home NodeB, or home NodeB, HNB), baseband unit , BBU), or wireless fidelity (Wifi) access point (access point, AP), etc.
  • the RAN may include a centralized unit (CU) node and a distributed unit (DU) node.
  • the above communication architecture may be a 5G system or an evolved system thereof.
  • the embodiments of the present application are described by using a base station and a terminal as examples.
  • the terminal may feed back channel state information to the base station, so that the base station constructs a precoding matrix according to the channel state information, so as to perform data transmission with the terminal based on the precoding matrix.
  • the terminal feeds back the channel state information for constructing the precoding matrix to the base station based on the construction of the N orthogonal vector groups and the precoding matrix, and the base station according to the N orthogonal vector groups and the channel fed back by the terminal. State information, and construct a precoding matrix based on the construction of the precoding matrix, so as to perform data transmission with the terminal based on the precoding matrix.
  • the orthogonal vector group may specifically be an orthogonal beam group, and an orthogonal beam group includes at least one beam vector (also referred to as an orthogonal beam, or simply a beam).
  • the orthogonal vector group may also be a frequency domain base vector group, and one frequency domain base vector group includes at least one frequency domain base vector.
  • the number of orthogonal beams in each of the N orthogonal beam groups may be the same or different.
  • the number of frequency-domain base vectors in each of the N frequency-domain base vector groups may be the same or different.
  • N orthogonal beam groups beams in the same orthogonal beam group are orthogonal to each other, and beams between different orthogonal beam groups are orthogonal to each other.
  • One orthogonal beam group is used to construct precoding corresponding to M layers in the precoding matrix, and different orthogonal beam groups are used to construct precoding corresponding to different layers in the precoding matrix.
  • N and M are integers greater than or equal to 1.
  • the frequency-domain base vectors in the same frequency-domain base vector group are orthogonal to each other, and the frequency-domain base vectors between different frequency-domain base vector groups are orthogonal to each other.
  • One frequency domain base vector group is used to construct precoding corresponding to M layers in the precoding matrix, and different frequency domain base vector groups are used to construct precoding corresponding to different layers in the precoding matrix.
  • N and M are integers greater than or equal to 1.
  • the value of M can be agreed by the system.
  • the system may agree on an orthogonal beam group for constructing precoding corresponding to two layers in the precoding matrix. Since each column in the precoding matrix corresponds to a layer, an orthogonal beam group or a frequency domain basis vector group is used to construct the precoding corresponding to the 2 layers in the precoding matrix. It also means that an orthogonal beam group or A frequency-domain basis vector set is used to construct two columns of precoding in the precoding matrix.
  • the N orthogonal beam groups may be formed by selecting a partial beam from a candidate beam set.
  • the terminal may determine the candidate beam set according to a codebook parameter configured by the base station and information predefined by the system.
  • the system may predefine an orthogonal beam group for constructing precoding corresponding to several layers in the precoding matrix
  • the codebook parameters configured by the base station may include channel state information reference signals (CSI-RS ) Number of ports.
  • CSI-RS channel state information reference signals
  • the N frequency-domain base vector groups may be formed by selecting a part of frequency-domain base vectors from a candidate frequency-domain base vector set.
  • the terminal may determine the candidate frequency domain base vector set according to the codebook parameters configured by the base station and information predefined by the system.
  • the system may predefine a frequency-domain basis vector group for constructing precoding corresponding to several layers in the precoding matrix, and the codebook parameters configured by the base station may include the number of CSI-RS ports.
  • the structure of the precoding matrix may adopt the structure of the first type of precoding matrix, or may also adopt the structure of the second type of precoding matrix, which are separately described below.
  • the construction of the first type of precoding matrix has the following characteristics: the precoding of different polarization directions of the same layer is based on the beams in the same orthogonal beam group or the frequency domain base vectors in the same frequency domain base vector group and uses the same Is constructed by the linear merging coefficients, and there is a phase adjustment factor between the different polarization directions.
  • the layers corresponding to the same orthogonal beam group or the same frequency domain base vector group are kept mutually orthogonal through phase adjustment factors, and the layers corresponding to different orthogonal beam groups or different frequency domain base vector groups are passed through the beams in the orthogonal beam group. Orthogonality keeps the orthogonality between layers.
  • the system predefines the precoding corresponding to each orthogonal beam group or each frequency domain base vector group.
  • Two layers in a matrix That is, layer 0 and layer 1 correspond to the first orthogonal beam group or the first frequency domain base vector group, and layer 2 corresponds to the second orthogonal beam group or the second frequency domain base vector group.
  • the terminal determines that the first orthogonal beam group includes the beam ⁇ 1,2,7,8 ⁇ or the first frequency domain base vector group includes the frequency domain base vector ⁇ 1,2,7,8 ⁇ , and the second The orthogonal beam group contains the beam ⁇ 3,4,5,6 ⁇ or the second frequency domain base vector group contains the frequency domain base vector ⁇ 3,4,5,6 ⁇ .
  • the precoding matrix constructed based on the first precoding matrix can be expressed as:
  • Each column (two blocks) of the block matrix corresponds to one layer, and each row (one block) corresponds to one polarization direction.
  • a precoding in the precoding matrix can be expressed as:
  • l 0,1,2;
  • the first For the ith beam in the orthogonal beam group a 2D DFT vector can be used.
  • the system's predefined definition, and the two orthogonal beam groups selected that is, the first orthogonal beam group and the second orthogonal beam group
  • c 0, l, i represents a subband phase quantization factor acting on beam i, the first polarization direction, and layer l in the orthogonal beam group;
  • phase adjustment factor used to adjust the phase between beams in two polarization directions. Its value can be The phase adjustment factor can ensure the orthogonality between the first two columns in the precoding matrix corresponding to the first orthogonal beam group.
  • each Orthogonal beam groups or frequency domain base vector groups correspond to two layers in the precoding matrix. That is, layer 0 and layer 1 correspond to the first orthogonal beam group or the first frequency domain base vector group, and layer 2 corresponds to the second orthogonal beam group or the second frequency domain base vector group.
  • the terminal determines that the first orthogonal beam group includes the beam ⁇ 1,2,7,8 ⁇ or the first frequency domain base vector group includes the frequency domain base vector ⁇ 1,2,7,8 ⁇ , and the second The orthogonal beam group includes a beam ⁇ 3,4 ⁇ or a second frequency domain basis vector ⁇ 3,4 ⁇ .
  • the precoding matrix constructed based on the first precoding matrix can be expressed as:
  • Each column (two blocks) of the block matrix corresponds to one layer, and each row (one block) corresponds to one polarization direction.
  • a precoding in the precoding matrix can be expressed as:
  • l 0,1,2;
  • v i (n) represents the ith beam in the orthogonal beam group n, and a 2D DFT vector can be used.
  • DFT vectors can be used. Select from N3O3 DFT basis vector set. N3 is related to the number of subband CQIs configured in the system, and O3 is the oversampling factor.
  • Each layer uses a frequency-domain basis vector set.
  • p i, j, l represents an amplitude quantization factor acting on beam i in the orthogonal beam group, base vector j in the frequency domain base vector group, and layer l;
  • c i, j, l represents a phase quantization factor acting on the beam i in the orthogonal beam group, the base vector j in the frequency domain base vector group, and the layer l;
  • phase adjustment factor used to adjust the phase between beams in two polarization directions. Its value can be The phase adjustment factor can ensure the orthogonality between the first two columns in the precoding matrix corresponding to the first orthogonal beam group.
  • the precoding of the two polarization directions corresponding to layer 0 ( with ) Use the same linear merging coefficient to linearly merge all the vectors in the first orthogonal beam group or the first frequency domain basis vector group, and obtain the precoding of the two polarization directions corresponding to layer 1 ( with )
  • the layers corresponding to the same orthogonal beam group or the same frequency-domain base vector group are kept mutually orthogonal by a phase adjustment factor.
  • layers 0 and 1 corresponding to the first orthogonal beam group are based on the phase adjustment factor.
  • orthogonal i.e. vector versus Orthogonal.
  • rank 4 (that is, a precoding matrix with a rank of 4 and a number of layers of 4) and 2 polarization directions as examples.
  • the system predefines each orthogonal beam group or each frequency domain base vector group corresponding to the precoding Two layers in the encoding matrix. That is, layer 0 and layer 1 correspond to the first orthogonal beam group or the first frequency domain base vector group, and layer 2 corresponds to the second orthogonal beam group or the second frequency domain base vector group.
  • the terminal determines that the first orthogonal beam group includes the beam ⁇ 1,2,7,8 ⁇ or the first frequency domain base vector group includes the frequency domain base vector ⁇ 1,2,7,8 ⁇ , and the second The orthogonal beam group contains the beam ⁇ 3,4,5,6 ⁇ or the second frequency domain base vector contains the frequency domain base vector ⁇ 3,4,5,6 ⁇ .
  • the precoding matrix constructed based on the first precoding matrix can be expressed as:
  • Each column of the matrix corresponds to a layer, and each row corresponds to a polarization direction.
  • a precoding in the precoding matrix can be expressed as:
  • l 0,1,2,3;
  • the first For the ith beam in the orthogonal beam group a 2D DFT vector can be used.
  • the system's predefined definition, and the two orthogonal beam groups selected that is, the first orthogonal beam group and the second orthogonal beam group
  • c 0, l, i represents a subband phase quantization factor acting on beam i, the first polarization direction, and layer l in the orthogonal beam group;
  • phase adjustment factor used to adjust the phase between beams in two polarization directions. Its value can be This phase adjustment factor can ensure the orthogonality between the first two columns in the precoding matrix corresponding to the first orthogonal beam group, and the guarantee between the two columns in the precoding matrix corresponding to the second orthogonal beam group. Orthogonality.
  • the precoding of the two polarization directions corresponding to layer 0 ( with ) Use the same linear merging coefficient to linearly merge all the vectors in the first orthogonal beam group or the first frequency domain basis vector group, and obtain the precoding of the two polarization directions corresponding to layer 1 ( with )
  • Use the same linear merging coefficient to linearly merge all the vectors in the first orthogonal beam group or the first frequency domain basis vector group and obtain the precoding of the two polarization directions corresponding to layer 2 ( with )
  • Use the same linear merging coefficient to linearly merge all the vectors in the second orthogonal beam group or the second frequency domain basis vector group, and obtain the precoding of the two polarization directions corresponding to layer 3 ( with ) Are obtained by linearly merging all vectors in the second orthogonal beam group or the second frequency domain base vector group by using the same linear combination coefficient.
  • the layers corresponding to the same orthogonal beam group or the same frequency-domain base vector group are kept mutually orthogonal by a phase adjustment factor.
  • layers 0 and 1 corresponding to the first orthogonal beam group are based on the phase adjustment factor Keep orthogonal, i.e. vector versus Orthogonal; for another example, layer 2 and layer 3 corresponding to the second orthogonal beam group are based on a phase adjustment factor Keep orthogonal, i.e. vector versus Orthogonal.
  • the construction of the second type of precoding matrix has the following characteristics: in the precoding corresponding to the same orthogonal beam group or the same frequency domain base vector group, the precoding matrices of the same polarization direction in different layers correspond to the same or different linear combinations Coefficients, different polarization directions of the same layer correspond to different linear merging coefficients, and the existing vector orthogonalization method is used to ensure the orthogonality between the layers.
  • the precoding matrices of the same polarization direction in different layers correspond to the same linear merging coefficient, which can reduce the feedback overhead.
  • the system predefines the precoding corresponding to each orthogonal beam group or each frequency domain base vector group.
  • Two layers in a matrix That is, layer 0 and layer 1 correspond to the first orthogonal beam group or the first frequency domain base vector group, and layer 2 corresponds to the second orthogonal beam group or the second frequency domain base vector group.
  • the terminal determines that the first orthogonal beam group includes the beam ⁇ 1,2,7,8 ⁇ or the first frequency domain base vector group includes the frequency domain base vector ⁇ 1,2,7,8 ⁇ , and the second The orthogonal beam group contains the beam ⁇ 3,4,5,6 ⁇ or the second frequency domain base vector group contains the frequency domain base vector ⁇ 3,4,5,6 ⁇ .
  • the precoding matrix constructed based on the second type of precoding matrix can be expressed as:
  • Each column (two blocks) of the block matrix corresponds to one layer, and each row (one block) corresponds to one polarization direction.
  • the precoding in the precoding matrix can be expressed as:
  • l 0,1,2;
  • the number of beams in the orthogonal beam group and the second orthogonal beam group may also be different.
  • c r, 0, i represents the subband phase quantization factor acting on beam i, polarization direction r, and layer 0 in the orthogonal beam group;
  • c r, 2 i represents the subband phase quantization factor acting on beam i, polarization direction r and layer 2 in the orthogonal beam group;
  • phase adjustment factor Represents the phase adjustment factor. Its value can be The phase adjustment factor can ensure the orthogonality between the first two columns in the precoding matrix corresponding to the first orthogonal beam group.
  • the precoding of the two polarization directions corresponding to layer 0 ( with ) Are obtained according to the linearly merged beams of all the vectors in the first orthogonal beam group or the first frequency domain base vector group
  • the precoding of the two polarization directions corresponding to layer 1 ( with ) Are obtained by linearly combining the beams of all the vectors in the first orthogonal beam group or the first frequency domain base vector group and adjusting the inter-polar phase
  • the pre-coding of the two polarization directions corresponding to layer 2 with ) Are all obtained by linearly combining the beams of all vectors in the second orthogonal beam group or the second frequency domain base vector group.
  • Precoding in the same polarization direction for layer 0 and layer 1 corresponding to the first orthogonal beam group or the first frequency domain basis vector group ( with ) Corresponds to the same linear merging coefficient, precoding ( with ) Corresponds to the same linear merging coefficient, and precoded ( with ) Corresponding to the linear merging coefficient and precoding ( with The linear merging coefficients corresponding to) are not equal, and are determined independently.
  • the existing vector orthogonalization method is used between layer 0 and layer 1 to determine the phase adjustment factors of the two polarization directions in layer 1 to achieve inter-layer orthogonalization.
  • the system predefines the precoding corresponding to each orthogonal beam group or each frequency domain base vector group.
  • Two layers in a matrix That is, layer 0 and layer 1 correspond to the first orthogonal beam group or the first frequency domain base vector group, and layer 2 corresponds to the second orthogonal beam group or the second frequency domain base vector group.
  • the terminal determines that the first orthogonal beam group includes the beam ⁇ 1,2,7,8 ⁇ or the first frequency domain base vector group includes the frequency domain base vector ⁇ 1,2,7,8 ⁇ , and the second The orthogonal beam group contains the beam ⁇ 3,4,5,6 ⁇ or the second frequency domain base vector group contains the frequency domain base vector ⁇ 3,4,5,6 ⁇ .
  • the precoding matrix constructed based on the second type of precoding matrix can be expressed as:
  • Each column of the matrix corresponds to a layer, and each row corresponds to a polarization direction.
  • the precoding in the precoding matrix can be expressed as:
  • l 0,1,2,3;
  • the system's predefined definition, and the two orthogonal beam groups selected that is, the first orthogonal beam group and the second orthogonal beam group
  • the number of beams in the first orthogonal beam group and the second orthogonal beam group may also be different, for example, the terminal determines that the first orthogonal beam group includes the beam ⁇ 1,2,7,8 ⁇ , and the second orthogonal beam group If the beam group includes only the beam ⁇ 3,4 ⁇ , then layer 0 and layer 1 (that is,
  • c r, 0, i represents the subband phase quantization factor acting on beam i, polarization direction r, and layer 0 in the orthogonal beam group;
  • c r2i represents the subband phase quantization factor acting on beam i, polarization direction r, and layer 2 in the orthogonal beam group;
  • phase adjustment factor can be Phase adjustment factor Can guarantee the orthogonality and phase adjustment factor between the first 2 columns of the first orthogonal beam group in the precoding matrix The orthogonality between the last 2 columns of the second orthogonal beam group in the precoding matrix can be guaranteed.
  • the existing vector orthogonalization method is used between layer 0 and layer 1 to determine the phase adjustment factors of the two polarization directions in layer 1 to achieve inter-layer orthogonalization.
  • Precoding in the same polarization direction for layer 2 and layer 3 corresponding to the second orthogonal beam group or the second frequency domain basis vector group ( with ) Corresponds to the same linear merging coefficient
  • precoded ( with ) Corresponding to the linear merging coefficient and precoding are not equal, and are determined independently.
  • the existing vector orthogonalization method is used between layers 2 and 3 to determine the phase adjustment factors of the two polarization directions in layer 3 to achieve inter-layer orthogonalization.
  • the construction of the third precoding matrix has the following characteristics: precoding in different polarization directions of the same layer is constructed using the same linear merging coefficient, and different polarization directions differ by a phase adjustment factor.
  • the layers corresponding to the same frequency domain base vector group maintain mutual orthogonality through phase adjustment factors, and the layers corresponding to different frequency domain base vector group maintain orthogonality between layers through the orthogonality of the base vector in the frequency domain base vector group. .
  • each orthogonal beam group or each The frequency domain basis vector group corresponds to two layers in the precoding matrix. That is, layer 0 and layer 1 correspond to the first orthogonal beam group or the first frequency domain base vector group, and layer 2 corresponds to the second orthogonal beam group or the second frequency domain base vector group.
  • the terminal determines that the first orthogonal beam group includes the beam ⁇ 1,2,7,8 ⁇ or the first frequency domain base vector group includes the frequency domain base vector ⁇ 1,2,7,8 ⁇ , and the second The orthogonal beam group contains the beam ⁇ 1,2 ⁇ or the second frequency domain base vector group contains the frequency domain base vector ⁇ 1,2 ⁇ .
  • the two orthogonal beam groups or the two frequency domain base vector groups are not orthogonal.
  • the precoding matrix constructed based on the first precoding matrix can be expressed as:
  • Each column (two blocks) of the block matrix corresponds to one layer, and each row (one block) corresponds to one polarization direction.
  • a precoding in the precoding matrix can be expressed as:
  • l 0,1,2;
  • v i (n) represents the ith beam in the orthogonal beam group n, and a 2D DFT vector can be used.
  • the system's predefined definition, and the two orthogonal beam groups selected that is, the first orthogonal beam group and the second orthogonal beam group
  • DFT vectors can be used. Select from N3O3 DFT basis vector set. N3 is related to the number of subband CQIs configured in the system, and O3 is the oversampling factor. Each layer uses a frequency-domain basis vector set.
  • the base vectors in the frequency domain base vector groups of different layers may be the same or different.
  • M1 ⁇ M0 M1 ⁇ M0.
  • p i, j, l represents an amplitude quantization factor acting on beam i in the orthogonal beam group, base vector j in the frequency domain base vector group, and layer l;
  • c i, j, l represents a phase quantization factor acting on the beam i in the orthogonal beam group, the base vector j in the frequency domain base vector group, and the layer l;
  • phase adjustment factor used to adjust the phase between beams in two polarization directions. Its value can be The phase adjustment factor can ensure orthogonality between the first two columns in the precoding matrix corresponding to the first frequency-domain base vector group.
  • FIG. 3 it is a schematic flow chart of channel state information feedback according to an embodiment of the present application. This process is described by using an orthogonal beam group as an example. The principle of the information state information feedback process when using a frequency domain base vector group is the same.
  • the process can include:
  • S301 The terminal determines N orthogonal beam groups, where N is an integer greater than or equal to 1.
  • the terminal may determine N orthogonal beam groups based on a result of the channel measurement.
  • the terminal may use the rank value of the precoding matrix and an orthogonal beam group to construct the precoding of several layers in the precoding matrix, determine the number of orthogonal beam groups to be used, and select from the candidate beam set. A corresponding number of orthogonal beam groups.
  • the value of the rank of the precoding matrix may be indicated to the terminal by the base station, or may be determined by the terminal according to the channel measurement. For the method for determining the candidate beam set, reference may be made to the foregoing description, which is not repeated here.
  • an orthogonal beam group may be selected from a candidate beam set according to a channel measurement result.
  • the terminal may calculate the received power of different beams according to the channel measurement result, select the first L orthogonal beams with the highest power to form a first orthogonal beam group, and select the L orthogonal beams with the next highest power to form a second Orthogonal beam group.
  • the beam ⁇ 1,2,7,8 ⁇ in FIG. 2 is selected to form a first orthogonal beam group
  • the beam ⁇ 3,4,5,6 ⁇ is selected to form a second orthogonal beam group.
  • S302 The terminal determines a linear merging coefficient for constructing the precoding matrix according to the beams in the N orthogonal beam groups.
  • the linear combination coefficient includes a linear combination coefficient corresponding to each layer in the precoding matrix.
  • the linear combination coefficient includes the following parameters: an amplitude quantization factor and a phase quantization factor.
  • the amplitude quantization factor may include a wideband amplitude quantization factor and / or a subband amplitude quantization factor;
  • the phase quantization factor may include a wideband phase quantization factor and / or a subband phase quantization factor.
  • the linear merging coefficients may be implemented based on an existing Type II codebook, such as projecting a channel feature vector on an orthogonal beam group to obtain The corresponding coefficients are quantified.
  • the terminal determines the precoding corresponding to each layer in the precoding matrix based on the structure of the first precoding matrix and the beams in the N orthogonal beam groups. Coefficient of linear merging. The different polarization directions of the same layer correspond to the same linear merging coefficient, and the layers corresponding to the same orthogonal beam group are orthogonal to each other through a phase adjustment factor.
  • the phase adjustment factor can be determined in a traversal search manner.
  • the precoding of different polarization directions of the same layer is constructed based on the beams in the same orthogonal beam group and using the same linear merging coefficient. Therefore, for the same layer, For precoding in different polarization directions, as long as the linear merging coefficient corresponding to one polarization direction in the layer is determined and fed back, there is no need to separately determine and feedback the linear merging coefficient for different polarization directions, so the feedback overhead can be reduced.
  • the orthogonality of the beams between layers corresponding to different orthogonal beam groups ensures mutual orthogonality between the layers.
  • the wideband amplitude quantization factor corresponding to one polarization direction of each layer and the subband amplitude quantization corresponding to one polarization direction of each layer are determined.
  • the factor, the sub-band phase quantization factor corresponding to one polarization direction of each layer, and the phase adjustment factors of layer 0 and layer 2 are sufficient. It is not necessary to calculate and feed back linear merging coefficients separately for two different polarization directions.
  • the terminal determines a linear merging coefficient for constructing the precoding matrix based on the structure of the second precoding matrix and the beams in the N orthogonal beam groups.
  • the same polarization direction of different layers corresponds to the same or different linear merging coefficients
  • different polarization directions of the same layer correspond to different linear merging coefficients.
  • an existing method of vector orthogonalization can be used to ensure orthogonality between layers.
  • the existing vector orthogonalization method can be used between different layers to ensure the orthogonality between the layers through the phase adjustment factors of different polarization directions in one layer.
  • the layers corresponding to different orthogonal beam groups pass through the orthogonal beam group.
  • the orthogonality between the beams ensures the orthogonality between different layers, so the orthogonality between all layers in the precoding matrix can be achieved. Reduce inter-layer interference.
  • the broadband corresponding to the corresponding polarization direction can be determined for the first polarization direction and the second polarization direction of layer 0 and layer 1 corresponding to the first orthogonal beam group, respectively.
  • the amplitude quantization factor, the subband amplitude quantization factor, and the subband phase quantization factor are sufficient. It is not necessary to calculate and feed back linear merging coefficients separately for layers 0 and 1 in the same polarization direction.
  • the first polarization direction and the second polarization direction of layers 0 and 1 corresponding to the first orthogonal beam group can be respectively determined to correspond to the corresponding polarization directions.
  • Broadband amplitude quantization factor, subband amplitude quantization factor, and subband phase quantization factor, and corresponding polarization directions are determined for the first and second polarization directions of layers 2 and 3 corresponding to the second orthogonal beam group, respectively.
  • the corresponding wideband amplitude quantization factor, subband amplitude quantization factor, and subband phase quantization factor do not need to calculate and feed back linear merging coefficients separately for two different layers in the same polarization direction.
  • S303 The terminal feeds back channel state information to the base station, where the channel state information includes indication information of the N orthogonal beam groups and a linear combination coefficient of the precoding matrix determined in S302.
  • the linear combination coefficients of the precoding matrix fed back by the terminal include linear combination coefficients corresponding to the Y layers.
  • the value of Y is less than or equal to the number of layers of the precoding matrix.
  • the selection of the Y layers is predefined by the system or indicated to the terminal by higher layer signaling.
  • the indication information of the N orthogonal beam groups is used to indicate the N orthogonal beam groups selected by the terminal and the beams included in each orthogonal beam group.
  • the channel state information fed back by the terminal may further include phase adjustment factors corresponding to S layers in the precoding matrix, where S is less than or equal to the number of layers of the precoding matrix.
  • the selection of the S layers is predefined by the system or indicated to the terminal by higher layer signaling.
  • the linear combination coefficients of the precoding fed back by the terminal may include: Precoding ( with Corresponding wideband amplitude quantization factor Subband amplitude quantization factor And the subband phase quantization factor c 0,0, i , the pre-coding of the second polarization direction of layer 0 and layer 1 ( with Corresponding wideband amplitude quantization factor Subband amplitude quantization factor And the subband phase quantization factor c 10i , the precoding of the first polarization direction of layer 2 Corresponding wideband amplitude quantization factor Subband amplitude quantization factor And the subband phase quantization factor c 0,2, i , the precoding of the second polarization direction of layer 2 Corresponding wideband amplitude quantization factor Subband amplitude quantization factor And the sub-band phase quantization factors c 1,2, i . It can be seen that, for layer 0 and layer 1, only the
  • the linear combination coefficients of the precoding fed back by the terminal may include the first polarization directions of the layer 0 and the layer 1.
  • Precoding with Corresponding wideband amplitude quantization factor Subband amplitude quantization factor And the subband phase quantization factor c 0,0, i , the pre-coding of the second polarization direction of layer 0 and layer 1 ( with Corresponding wideband amplitude quantization factor Subband amplitude quantization factor And the subband phase quantization factor c 10i , the precoding of the first polarization direction of layer 2 and layer 3 ( with Corresponding wideband amplitude quantization factor Subband amplitude quantization factor And the subband phase quantization factor c 0,2, i , the precoding of the second polarization direction of layer 2 and layer 3 ( with Corresponding wideband amplitude quantization factor Subband amplitude quantization factor And the sub-band phase quantization factors c 1,
  • the base station constructs a precoding matrix according to the channel state information sent by the terminal and the indicated orthogonal beam group, and the precoding matrix is used for data transmission between the base station and the terminal.
  • the base station may construct a precoding matrix according to the received channel state information and the indication information of the orthogonal beam group, and according to the structure of the precoding matrix.
  • the terminal may determine S frequency domain base vector groups (S is an integer greater than or equal to 1), and according to the beam vectors and Said S frequency-domain basis vector groups determine the linear merging coefficients used to construct the precoding matrix.
  • S is an integer greater than or equal to 1
  • the frequency-domain base vectors in the frequency-domain base vector group used by the layer with the larger layer index are selected from the frequency-domain base vector groups used by the layer with the smaller layer index.
  • the frequency-domain base vectors in the S frequency-domain base vector groups may be mutually orthogonal or non-orthogonal, and the S frequency-domain base vector groups may be mutually orthogonal or non-orthogonal. This application The embodiment does not limit this.
  • the terminal may determine the S beam groups in the step of determining the linear combination coefficients for constructing the precoding matrix according to the vectors in the N frequency domain base vector groups.
  • S is an integer greater than or equal to 1
  • a linear merging coefficient for constructing a precoding matrix is determined according to the vectors in the N frequency domain base vector groups and the S beam groups.
  • a beam vector in a beam group used by a layer with a larger layer index is selected from a beam group used by a layer with a smaller layer index.
  • the beams in the S beam groups may be mutually orthogonal or non-orthogonal, and the S beam groups may be mutually orthogonal or non-orthogonal, which is not limited in the embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • the terminal can implement the processes described in the foregoing embodiments.
  • the terminal may include an orthogonal vector group determination module 401, a linear combination coefficient determination module 402, and a feedback module 403.
  • the orthogonal vector group determination module 401 is configured to determine N orthogonal vector groups, where N is an integer greater than or equal to 1. Among which, the beams in the same orthogonal vector group are mutually orthogonal, and one orthogonal vector group is used to construct a pre- Precoding corresponding to M layers in the coding matrix, different orthogonal vector groups construct precoding corresponding to different layers in the precoding matrix, and M is an integer greater than or equal to 1.
  • the linear combination coefficient determining module 402 is configured to determine a linear combination coefficient for constructing the precoding matrix according to the beams in the N orthogonal vector groups, where the linear combination coefficient includes the precoding matrix.
  • a feedback module 403 is configured to feed back channel state information to the base station, where the channel state information includes indication information of the N orthogonal vector groups and the linearity corresponding to the Y layers in the determined linear combination coefficient of the precoding matrix. Merging coefficient, where Y is less than or equal to the number of layers of the precoding matrix.
  • vectors between the different orthogonal vector groups are mutually orthogonal.
  • different polarization directions of the same layer correspond to the same linear merging coefficient
  • the layers corresponding to the same orthogonal vector group are orthogonal to each other through a phase adjustment factor.
  • the same polarization direction of different layers corresponds to the same or different linear combination coefficients, and different polarization directions of the same layer Corresponding to different linear merging coefficients, and different layers are orthogonal to each other.
  • the channel state information further includes:
  • phase adjustment factors corresponding to the S layers in the precoding matrix determined by the terminal where S is less than or equal to the number of layers of the precoding matrix.
  • the linear combination coefficient includes the following parameters:
  • An amplitude quantization factor which includes a wideband amplitude quantization factor and / or a subband amplitude quantization factor
  • a phase quantization factor which includes a wideband phase quantization factor and / or a subband phase quantization factor.
  • the number of vectors in each of the N orthogonal vector groups is the same or different.
  • the orthogonal vector group is an orthogonal beam group, and the orthogonal beam group includes at least one beam vector; or the orthogonal vector group is a frequency domain base vector group, and the frequency domain vector group Includes at least one frequency-domain basis vector.
  • the linear combination coefficient determining module 402 is specifically configured to:
  • the frequency-domain base vector in the frequency-domain base vector group used by a layer with a larger layer index is a frequency-domain base vector group used from a layer with a smaller layer index Selected.
  • the linear combination coefficient determining module 402 is specifically configured to:
  • a beam vector in a beam group used by a layer with a larger layer index is selected from a beam group used by a layer with a smaller layer index.
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present application.
  • the terminal can implement the processes described in the foregoing embodiments.
  • the base station may include a receiving module 501 and a precoding matrix determining module 502.
  • the receiving module 501 is configured to receive channel state information fed back by a terminal, where the channel state information includes indication information of N orthogonal vector groups and corresponding to Y layers in a linear combination coefficient determined by the terminal for constructing a precoding matrix. Coefficient of linear combination, where Y is less than or equal to the number of layers of the precoding matrix; wherein, among the N orthogonal vector groups, the beams in the same orthogonal vector group are orthogonal to each other, and one orthogonal vector group is used for The precoding corresponding to M layers in the precoding matrix is constructed, and different orthogonal vector groups are used to construct the precoding corresponding to different layers in the precoding matrix. N and M are both integers greater than or equal to 1.
  • a precoding matrix determining module 502 is configured to construct the precoding matrix according to the channel state information.
  • vectors between the different orthogonal vector groups are mutually orthogonal.
  • different polarization directions of the same layer correspond to the same linear merging coefficient
  • the layers corresponding to the same orthogonal vector group are orthogonal to each other through a phase adjustment factor.
  • the same polarization direction of different layers corresponds to the same or different linear combination coefficients, and different polarization directions of the same layer Corresponding to different linear merging coefficients, and different layers are orthogonal to each other.
  • the channel state information further includes:
  • phase adjustment factors corresponding to the S layers in the precoding matrix determined by the terminal where S is less than or equal to the number of layers of the precoding matrix.
  • the linear combination coefficient includes the following parameters:
  • An amplitude quantization factor which includes a wideband amplitude quantization factor and / or a subband amplitude quantization factor
  • a phase quantization factor which includes a wideband phase quantization factor and / or a subband phase quantization factor.
  • the number of vectors in each of the N orthogonal vector groups is the same or different.
  • the orthogonal vector group is an orthogonal beam group, and the orthogonal beam group includes at least one beam vector;
  • the orthogonal vector group is a frequency domain base vector group, and the frequency domain vector group includes at least one frequency domain base vector.
  • FIG. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • the communication device can implement the terminal-side process described in the foregoing embodiment.
  • the communication device may include a processor 601, a memory 602, a transceiver 603, and a bus interface 604.
  • the processor 601 is responsible for managing the bus architecture and general processing, and the memory 602 may store data used by the processor 601 when performing operations.
  • the transceiver 603 is configured to receive and send data under the control of the processor 601.
  • the bus architecture may include any number of interconnected buses and bridges, and one or more processors specifically represented by the processor 601 and various circuits of the memory represented by the memory 602 are linked together.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, so they are not further described herein.
  • the bus interface 604 provides an interface.
  • the processor 601 is responsible for managing the bus architecture and general processing, and the memory 602 may store data used by the processor 601 when performing operations.
  • the processes disclosed in the embodiments of the present application may be applied to the processor 601, or implemented by the processor 601.
  • each step of the processing flow may be completed by an integrated logic circuit of hardware in the processor 601 or an instruction in the form of software.
  • the processor 601 may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the embodiments in this application.
  • a general-purpose processor may be a microprocessor or any conventional processor.
  • a software module may be located in a mature storage medium such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, and the like.
  • the storage medium is located in the memory 602, and the processor 601 reads the information in the memory 602 and completes the steps of the signal processing flow in combination with its hardware.
  • the processor 601 is configured to read a program in the memory 602 and execute:
  • N is an integer greater than or equal to 1
  • the beams in the same orthogonal vector group are mutually orthogonal
  • one orthogonal vector group is used to construct precoding corresponding to M layers in the precoding matrix.
  • Different orthogonal vector groups construct precoding corresponding to different layers in the precoding matrix, and M is an integer greater than or equal to 1.
  • the channel state information includes the indication information of the N orthogonal vector groups and the linear combination coefficients corresponding to the Y layers in the linear combination coefficients of the precoding matrix determined, where Y is less than Or equal to the number of layers of the precoding matrix.
  • vectors between the different orthogonal vector groups are mutually orthogonal.
  • different polarization directions of the same layer correspond to the same linear merging coefficient
  • the layers corresponding to the same orthogonal vector group are orthogonal to each other through a phase adjustment factor.
  • the same polarization direction of different layers corresponds to the same or different linear combination coefficients, and different polarization directions of the same layer Corresponding to different linear merging coefficients, and different layers are orthogonal to each other.
  • the channel state information further includes:
  • phase adjustment factors corresponding to the S layers in the precoding matrix determined by the terminal where S is less than or equal to the number of layers of the precoding matrix.
  • the linear combination coefficient includes the following parameters:
  • An amplitude quantization factor which includes a wideband amplitude quantization factor and / or a subband amplitude quantization factor
  • a phase quantization factor which includes a wideband phase quantization factor and / or a subband phase quantization factor.
  • the number of vectors in each of the N orthogonal vector groups is the same or different.
  • the orthogonal vector group is an orthogonal beam group, and the orthogonal beam group includes at least one beam vector; or the orthogonal vector group is a frequency domain base vector group, and the frequency domain vector group Includes at least one frequency-domain basis vector.
  • the processor 601 is specifically configured to:
  • a beam vector in a beam group used by a layer with a larger layer index is selected from a beam group used by a layer with a smaller layer index.
  • the processor 601 is specifically configured to:
  • a beam vector in a beam group used by a layer with a larger layer index is selected from a beam group used by a layer with a smaller layer index.
  • the communication device can implement the base station-side process described in the foregoing embodiment.
  • the communication device may include a processor 701, a memory 702, a transceiver 703, and a bus interface 704.
  • the processor 701 is responsible for managing the bus architecture and general processing, and the memory 702 may store data used by the processor 701 when performing operations.
  • the transceiver 703 is configured to receive and transmit data under the control of the processor 701.
  • the bus architecture may include any number of interconnected buses and bridges, and one or more processors specifically represented by the processor 701 and various circuits of the memory represented by the memory 702 are linked together.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, so they are not further described herein.
  • the bus interface 704 provides an interface.
  • the processor 701 is responsible for managing the bus architecture and general processing, and the memory 702 may store data used by the processor 701 when performing operations.
  • the processes disclosed in the embodiments of the present application may be applied to the processor 701 or implemented by the processor 701. In the implementation process, each step of the processing flow may be completed by an integrated logic circuit of hardware in the processor 701 or an instruction in the form of software.
  • the processor 701 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the embodiments in this application.
  • a general-purpose processor may be a microprocessor or any conventional processor.
  • a software module may be located in a mature storage medium such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, and the like.
  • the storage medium is located in the memory 702, and the processor 701 reads the information in the memory 702 and completes the steps of the signal processing flow in combination with its hardware.
  • the processor 701 is configured to read a program in the memory 702 and execute:
  • the channel state information includes indication information of N orthogonal vector groups and linear combination coefficients corresponding to Y layers among linear combination coefficients determined by the terminal for constructing a precoding matrix, where Y is less than or equal to the number of layers of the precoding matrix; among the N orthogonal vector groups, the beams in the same orthogonal vector group are mutually orthogonal, and one orthogonal vector group is used to construct M in the precoding matrix Precoding corresponding to each layer, different orthogonal vector groups construct precoding corresponding to different layers in the precoding matrix, and N and M are integers greater than or equal to 1.
  • vectors between the different orthogonal vector groups are mutually orthogonal.
  • different polarization directions of the same layer correspond to the same linear merging coefficient
  • the layers corresponding to the same orthogonal vector group are orthogonal to each other through a phase adjustment factor.
  • the same polarization direction of different layers corresponds to the same or different linear combination coefficients, and different polarization directions of the same layer Corresponding to different linear merging coefficients, and different layers are orthogonal to each other.
  • the channel state information further includes:
  • phase adjustment factors corresponding to the S layers in the precoding matrix determined by the terminal where S is less than or equal to the number of layers of the precoding matrix.
  • the linear combination coefficient includes the following parameters:
  • An amplitude quantization factor which includes a wideband amplitude quantization factor and / or a subband amplitude quantization factor
  • a phase quantization factor which includes a wideband phase quantization factor and / or a subband phase quantization factor.
  • the number of vectors in each of the N orthogonal vector groups is the same or different.
  • the orthogonal vector group is an orthogonal beam group, and the orthogonal beam group includes at least one beam vector;
  • the orthogonal vector group is a frequency domain base vector group, and the frequency domain vector group includes at least one frequency domain base vector.
  • an embodiment of the present application further provides a computer-readable storage medium.
  • the computer-readable storage medium stores computer-executable instructions, where the computer-executable instructions are used to cause the computer to execute a process performed on a terminal side in the foregoing embodiments.
  • an embodiment of the present application further provides a computer-readable storage medium.
  • the computer-readable storage medium stores computer-executable instructions, where the computer-executable instructions are used to cause the computer to execute a process performed by a base station side in the foregoing embodiments.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a specific manner such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, the instructions
  • the device implements the functions specified in one or more flowcharts and / or one or more blocks of the block diagram.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of steps can be performed on the computer or other programmable device to produce a computer-implemented process, which can be executed on the computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

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Abstract

本申请公开了一种信道状态信息反馈方法、预编码矩阵确定方法及装置。本申请中，终端确定N个正交向量组，其中一个正交向量组用于构造预编码矩阵中M个层对应的预编码；终端根据N个正交向量组中的波束，确定用于构造预编码矩阵的线性合并系数，所述线性合并系数包括所述预编码矩阵中每层对应的线性合并系数；终端向基站反馈信道状态信息，所述信道状态信息包括所述N个正交向量组的指示信息以及确定出的所述预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数。

Description

信道状态信息反馈方法、预编码矩阵确定方法及装置
本申请要求在2018年6月8日提交中国专利局、申请号为201810590080.9、发明名称为“信道状态信息反馈方法、预编码矩阵确定方法及装置”的中国专利申请的优先权，在2018年9月21日提交中国专利局、申请号为201811108689.4、发明名称为“信道状态信息反馈方法、预编码矩阵确定方法及装置”的中国专利申请的优先权，以及在2019年2月15日提交中国专利局、申请号为201910117823.5、发明名称为“信道状态信息反馈方法、预编码矩阵确定方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信技术领域，尤其涉及一种信道状态信息反馈方法、预编码矩阵确定方法及装置。
背景技术
新无线(new radio，NR)系统中定义了两类码本：类型I码本(Type I)和类型II码本(Type II)。其中，Type I码本基于波束选择和相位调整，其反馈开销较小，对信道的量化精度较低；Type II码本基于正交波束的线性合并，其反馈开销大，具有较高的信道量化精度。
TypeII码本基于对正交波束组内的波束进行线性合并的方式，支持rank1码本和rank2码本。其中，rank1表示传输信道的秩等于1，表示采用1个数据层传输；rank2表示传输信道的秩等于2，表示采用2个数据层传输。
其中，rank1码本表示为：
Figure PCTCN2019089337-appb-000001
rank2码本表示为：
Figure PCTCN2019089337-appb-000002
其中，
Figure PCTCN2019089337-appb-000003
L表示组内的正交波束的数量，
Figure PCTCN2019089337-appb-000004
表示正交波束，其采用二维离散傅里叶变换(discrete fourier transform，DFT)向量，r＝0,1表示双 极化天线阵列中的第一极化方向和第二极化方向，l＝0,1表示层。
Figure PCTCN2019089337-appb-000005
表示作用于正交波束组中波束i、极化方向r及层l的宽带幅度量化因子；
Figure PCTCN2019089337-appb-000006
表示作用于正交波束组中波束i、极化方向r及层l的子带幅度量化因子；c r,l,i表示作用于正交波束组中波束i、极化方向r及层l的子带相位量化因子。这种码本结构可以支持的天线端口数目为{4,8,12,16,24,32}。
根据以上的码本结构，可以得出Type II码本需要确定一个正交波束组。每一层独立对此正交波束组中的所有波束进行线性合并，将线性合并系数的幅度和相位进行量化。
发明内容
本申请实施例提供一种信道状态信息反馈方法、预编码矩阵确定方法及装置。
第一方面，提供一种信道状态信息反馈方法，包括：终端确定N个正交向量组；根据所述N个正交向量组中的向量，确定用于构造所述预编码矩阵的线性合并系数，其中，所述线性合并系数包括所述预编码矩阵中每层对应的线性合并系数；所述终端向基站反馈信道状态信息，所述信道状态信息包括所述N个正交向量组的指示信息以及确定出的所述预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数。该方法中，同一正交向量组内的波束相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，N和M均为大于或等于1的整数。
根据本申请的上述实施例，终端确定N个正交向量组，根据所述N个正交向量组中的向量，确定预编码矩阵中每层对应的线性合并系数，在向基站反馈信道状态信息时，所反馈的信息包括述N个正交向量组的指示信息以及所述预编码矩阵的线性合并系数中Y个层对应的线性合并系数。由于Y可以小于所述预编码矩阵的层数，因此可以减小反馈开销。
在一种可能的实现方式中，所述不同的正交向量组间的向量相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
根据本申请的上述实施例，一方面，由于同一层的不同极化方向的预编码是根据同一正交向量组中的向量并采用相同的线性合并系数构造的，因此，针对同一层的不同极化方向的预编码，只要确定并反馈该层中一个极化方向对应的线性合并系数即可，无需针对不同极化方向分别确定并反馈线性合并系数，因此可以减少反馈开销。另一方面，不同正交向量组对应的层之间通过向量的正交保证了层之间的相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化 方向对应不同的线性合并系数，且不同层之间相互正交。
根据本申请的上述实施例，一方面，在一个正交向量组用于构造多个层的预编码时，同一正交向量组对应的多个层中，不同层的相同极化方向可以对应相同的线性合并系数，因此针对同一正交向量组对应的多个层的预编码，只要确定并反馈不同极化方向对应的线性合并系数即可，无需针对不同层分别确定并反馈线性合并系数，因此可以减少反馈开销。另一方面，由于不同正交向量组对应的层之间通过正交向量组内的向量间的正交性，可以保证不同层间的正交，因此可以实现预编码矩阵中所有层之间的正交。降低层间干扰。
在一种可能的实现方式中，所述信道状态信息还包括：所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
在一种可能的实现方式中，所述线性合并系数包括以下参数：幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
在一种可能的实现方式中，所述N个正交向量组中每个组内的向量个数相同或不同。
在一种可能的实现方式中，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
在一种可能的实现方式中，所述正交向量组为正交波束组时，所述终端根据所述N个正交向量组中的向量，确定用于构造所述预编码矩阵的线性合并系数，包括：所述终端确定S个频域基向量组，S为大于或等于1的整数；所述终端根据所述N个正交波束组中的波束向量和所述S个频域基向量组，确定用于构造所述预编码矩阵的线性合并系数。
在一种可能的实现方式中，所述S个频域基向量组中，层索引较大的层使用的频域基向量组中的频域基向量，是从层索引较小的层使用的频域基向量组中选取的。
在一种可能的实现方式中，所述正交向量组为频域基向量组时，所述终端根据所述N个频域基向量组中的向量，确定用于构造所述预编码矩阵的线性合并系数，包括：所述终端确定S个波束组，S为大于或等于1的整数；所述终端根据所述N个频域基向量组中的向量和所述S个波束组，确定用于构造所述预编码矩阵的线性合并系数。
在一种可能的实现方式中，所述S个波束组中，层索引较大的层使用的波束组中的波束向量，是从层索引较小的层使用的波束组中选取的。
第二方面，提供一种预编码矩阵确定方法，包括：基站接收终端反馈的信道状态信息，所述信道状态信息包括N个正交向量组的指示信息以及所述终端确定的用于构造预编码矩阵的线性合并系数中Y个层对应的线性合并系数，所述基站根据所述信道状态信息构造所 述预编码矩阵。其中Y小于或等于所述预编码矩阵的层数，所述N个正交向量组中，同一正交向量组内的向量相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，N和M均为大于或等于1的整数。
在一种可能的实现方式中，所述不同的正交向量组间的向量相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
在一种可能的实现方式中，所述信道状态信息还包括：所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
在一种可能的实现方式中，所述线性合并系数包括以下参数：幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
在一种可能的实现方式中，所述N个正交波束组中每个组内的正交波束个数相同或不同。
在一种可能的实现方式中，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
第三方面，提供一种终端，包括：正交波束组确定模块，用于确定N个正交向量组，N为大于或等于1的整数；其中，同一正交向量组内的波束相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，M为大于或等于1的整数。线性合并系数确定模块，用于根据所述N个正交向量组中的向量，确定用于构造所述预编码矩阵的线性合并系数；其中，所述线性合并系数包括所述预编码矩阵中每个层对应的线性合并系数。反馈模块，用于向基站反馈信道状态信息，所述信道状态信息包括所述N个正交向量组的指示信息以及确定出的所述预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数。
在一种可能的实现方式中，所述不同的正交向量组间的向量相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一层的不同极化方 向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
在一种可能的实现方式中，所述信道状态信息还包括：所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
在一种可能的实现方式中，所述线性合并系数包括以下参数：幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
在一种可能的实现方式中，所述N个正交向量组中每个组内的向量个数相同或不同。
在一种可能的实现方式中，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
在一种可能的实现方式中，所述正交向量组为正交波束组时，所述线性合并系数确定模块具体用于：确定S个频域基向量组，S为大于或等于1的整数；根据所述N个正交波束组中的波束向量和所述S个频域基向量组，确定用于构造所述预编码矩阵的线性合并系数。
在一种可能的实现方式中，所述S个频域基向量组中，层索引较大的层使用的频域基向量组中的频域基向量，是从层索引较小的层使用的频域基向量组中选取的。
在一种可能的实现方式中，所述正交向量组为频域基向量组时，所述线性合并系数确定模块具体用于：确定S个波束组，S为大于或等于1的整数；根据所述N个频域基向量组中的向量和所述S个波束组，确定用于构造所述预编码矩阵的线性合并系数。
在一种可能的实现方式中，所述S个波束组中，层索引较大的层使用的波束组中的波束向量，是从层索引较小的层使用的波束组中选取的。
第四方面，提供一种基站，包括：接收模块，用于接收终端反馈的信道状态信息，所述信道状态信息包括N个正交向量组的指示信息以及所述终端确定的用于构造预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数；其中，所述N个正交向量组中，同一正交向量组内的向量相互正交，不同正交向量组间的向量相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，N和M均为大于或等于1的整数；预编码矩阵确定模块，用于根据所述信道状态信息构造所述预编码矩阵。
在一种可能的实现方式中，所述不同的正交向量组间的向量相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
在一种可能的实现方式中，所述信道状态信息还包括：所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
在一种可能的实现方式中，所述线性合并系数包括以下参数：幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
在一种可能的实现方式中，所述N个正交波束组中每个组内的正交波束个数相同或不同。
在一种可能的实现方式中，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
第五方面，提供一种通信装置，包括：处理器、存储器和收发机；所述处理器，用于读取所述存储器中的程序，执行：确定N个正交向量组，N为大于或等于1的整数；根据所述N个正交向量组中的向量，确定用于构造所述预编码矩阵的线性合并系数，其中，所述线性合并系数包括所述预编码矩阵中每层对应的线性合并系数；通过所述收发机向基站反馈信道状态信息，所述信道状态信息包括所述N个正交向量组的指示信息以及确定出的所述预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数。该方法中，同一正交向量组内的向量相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，M为大于或等于1的整数。
在一种可能的实现方式中，所述不同的正交向量组间的向量相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
在一种可能的实现方式中，所述信道状态信息还包括：所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数，且S个层的选择由系统预定义或由高层信令指示给终端。
在一种可能的实现方式中，所述线性合并系数包括以下参数：幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
在一种可能的实现方式中，所述N个正交向量组中每个组内的向量个数相同或不同。
在一种可能的实现方式中，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
在一种可能的实现方式中，所述正交向量组为正交波束组时，所述处理器具体用于：确定S个频域基向量组，S为大于或等于1的整数；根据所述N个正交波束组中的波束向量和所述S个频域基向量组，确定用于构造所述预编码矩阵的线性合并系数。
在一种可能的实现方式中，所述S个波束组中，层索引较大的层使用的波束组中的波束向量，是从层索引较小的层使用的波束组中选取的。
在一种可能的实现方式中，所述正交向量组为频域基向量组时，所述处理器具体用于：确定S个波束组，S为大于或等于1的整数；根据所述N个频域基向量组中的向量和所述S个波束组，确定用于构造所述预编码矩阵的线性合并系数。
在一种可能的实现方式中，所述S个波束组中，层索引较大的层使用的波束组中的波束向量，是从层索引较小的层使用的波束组中选取的。
第六方面，提供一种通信装置，包括：处理器、存储器和收发机；所述处理器，用于读取所述存储器中的程序，执行：通过所述收发机接收终端反馈的信道状态信息，所述信道状态信息包括N个正交向量组的指示信息以及所述终端确定的用于构造预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数；根据所述信道状态信息构造所述预编码矩阵。其中，所述N个正交向量组中，同一正交向量组内的向量相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，N和M均为大于或等于1的整数。
在一种可能的实现方式中，所述不同的正交向量组间的向量相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
在一种可能的实现方式中，所述预编码矩阵的线性合并系数中，同一正交向量组对应 的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
在一种可能的实现方式中，所述信道状态信息还包括：所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
在一种可能的实现方式中，所述线性合并系数包括以下参数：幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
在一种可能的实现方式中，所述N个正交向量组中每个组内的向量个数相同或不同。
在一种可能的实现方式中，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
第七方面，提供一种计算机可读存储介质，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行如上述第一方面中任一项所述的方法。
第八方面，提供一种计算机可读存储介质，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行如上述第九方面中任一项所述的方法。
附图说明
图1为本申请实施例涉及的网络架构示意图；
图2为本申请实施例中的候选波束集合示意图；
图3为本申请实施例提供的信道状况信息反馈流程示意图；
图4为本申请实施例提供的终端的结构示意图；
图5为本申请实施例提供的基站的结构示意图；
图6为本申请实施例提供的通信装置的结构示意图；
图7为本申请另外的实施例提供的通信装置的结构示意图。
具体实施方式
目前的Type II码本仅支持rank1和rank2，不支持更高的rank取值。对于高rank Type II码本，若参照上述rank1码本和rank2码本的方案，比如对于rank3码本，独立确定3个层的线性合并系数并反馈，对于rank 4码本，独立确定4个层的线性合并系数并反馈，则 由于层数的增加导致反馈开销增大。另一方面，由于每层的线性合并系数独立确定，层与层之间不能保证正交性，因而数据传输时会产生数据层间干扰，影响系统的性能。这种影响对于采用高rank码本时更加明显。
本申请实施例提出信道状态信息反馈方法，可以基于波束线性合并的预编码矩阵进行信道状态信息反馈，以使基站可以根据接收到的信道状态信息构造出该预编码矩阵。本申请实施例可以支持更高的秩(rank)，并可同时兼顾反馈开销和降低层间干扰。
下面结合附图对本申请实施例进行详细描述。
参见图1，为本申请实施例提供的一种可能的通信场景的示意图。如图1所示，终端110通过无线接入网(radio access network，RAN)节点120接入到无线网络，以通过无线网络获取外网(例如因特网)的服务，或者通过无线网络与其它终端通信。
其中，终端又称之为用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)等，是一种向用户提供语音和/或数据连通性的设备，例如，具有无线连接功能的手持式设备、车载设备等。目前，一些终端的举例为：手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。
RAN是网络中将终端接入到无线网络的部分。RAN节点(或设备)为无线接入网中的节点(或设备)，又可以称为基站。目前，一些RAN节点的举例为：gNB、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station,BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，或无线保真(wireless fidelity，Wifi)接入点(access point，AP)等。另外，在一种网络结构中，RAN可以包括集中单元(centralized unit，CU)节点和分布单元(distributed unit，DU)节点。
上述通信架构，可以是5G系统或其演进系统。
本申请实施例以基站和终端为例进行描述。其中，终端可以向基站反馈信道状态信息，以使基站根据该信道状态信息构造预编码矩阵，从而基于该预编码矩阵与终端进行数据传输。
本申请实施例中，终端基于N个正交向量组以及预编码矩阵的构造，向基站反馈用于构造预编码矩阵的信道状态信息，基站根据该N个正交向量组以及该终端反馈的信道状态信息，并基于该预编码矩阵的构造来构造预编码矩阵，以便基于该预编码矩阵与终端进行数据传输。
所述正交向量组具体可以是正交波束组，一个正交波束组中包括至少一个波束向量(也可称正交波束，或简称波束)。所述正交向量组还可以是频域基向量组，一个频域基向量组中包括至少一个频域基向量。
其中，所述N个正交波束组中每个组内的正交波束个数可以相同也可以不同。所述N个频域基向量组中每个组内的频域基向量个数可以相同也可以不同。
其中，所述N个正交波束组中，同一正交波束组内的波束相互正交，不同正交波束组间的波束相互正交。一个正交波束组用于构造预编码矩阵中M个层对应的预编码，不同的正交波束组构造预编码矩阵中不同层对应的预编码。其中，N和M均为大于或等于1的整数。所述N个频域基向量组中，同一频域基向量组内的频域基向量相互正交，不同频域基向量组间的频域基向量相互正交。一个频域基向量组用于构造预编码矩阵中M个层对应的预编码，不同的频域基向量组构造预编码矩阵中不同层对应的预编码。其中，N和M均为大于或等于1的整数。
可选地，M的取值可由系统约定。比如，系统可约定一个正交波束组用于构造预编码矩阵中的2个层对应的预编码。由于预编码矩阵中的每列对应一个层，因此一个正交波束组或一个频域基向量组用于构造预编码矩阵中的2个层对应的预编码，也意味着一个正交波束组或一个频域基向量组用于构造预编码矩阵中的2列预编码。
可选地，所述N个正交波束组可以通过从候选波束集合中选取部分波束而构成。终端可以根据基站配置的码本参数以及系统预定义的信息来确定所述候选波束集合。其中，系统可预定义一个正交波束组用于构造预编码矩阵中的几个层对应的预编码，基站配置的码本参数可包括信道状态信息参考信号(channel state information reference signal，CSI-RS)端口数。
举例来说，基站配置的码本参数，具体可包括一个极化方向的CSI-RS端口数为(N 1，N 2)＝(4,2)，总的CSI-RS端口数为2·N 1·N 2＝16。系统可预定义每个正交波束组中的波束个数为L＝4，并且可针对CSI-RS端口数为(N 1，N 2)的情况，预定义对应的过采样因子为(O 1，O 2)＝(4,4)。
终端可根据基站配置的上述码本参数以及上述系统预定义的信息，确定候选波束集合中包括N 1·O 1·N 2·O 2＝128个波束。如图2所示。由于过采样因子为4，其中在N 1方向或 N 2方向上每间隔4个波束的波束之间均为相互正交的波束。例如标识为1～8的8个波束之间均相互正交，另外8个深色填充的波束之间均相互正交。
可选地，所述N个频域基向量组可以通过从候选频域基向量集合中选取部分频域基向量而构成。终端可以根据基站配置的码本参数以及系统预定义的信息来确定所述候选频域基向量集合。其中，系统可预定义一个频域基向量组用于构造预编码矩阵中的几个层对应的预编码，基站配置的码本参数可包括CSI-RS端口数。
本申请实施例中，所述预编码矩阵的结构可采用第一种预编码矩阵的构造，也可采用第二种预编码矩阵的构造，下面分别说明。
(一)第一种预编码矩阵的构造
所述第一种预编码矩阵的构造具有如下特点：同一层的不同极化方向的预编码是根据同一正交波束组中的波束或同一频域基向量组中的频域基向量并采用相同的线性合并系数构造的，且不同极化方向之间相差一个相位调整因子。同一正交波束组或同一频域基向量组对应的层之间通过相位调整因子保持相互正交，不同正交波束组或不同频域基向量组对应的层之间通过正交波束组中波束的正交性保持层间的正交。
以rank＝3(即秩为3的预编码矩阵，层数为3)且2个极化方向为例来说，系统预定义每个正交波束组或每个频域基向量组对应预编码矩阵中的两层。即层0和层1对应第一正交波束组或第一频域基向量组，层2对应第二正交波束组或第二频域基向量组。根据图2所示，终端确定第一正交波束组包含波束{1,2,7,8}或第一频域基向量组包含频域基向量{1,2,7,8}，第二正交波束组包含波束{3,4,5,6}或第二频域基向量组包含频域基向量{3,4,5,6}。基于第一种预编码矩阵构造的预编码矩阵可表示为：
Figure PCTCN2019089337-appb-000007
其中，该块矩阵的每一列(两个块)对应一个层，每一行(一个块)对应一个极化方向。该预编码矩阵中的一个预编码可表示为：
Figure PCTCN2019089337-appb-000008
其中，以采用正交波束组为例，上述表达式中相关参数的说明如下(采用频域基向量组时原理相同)：
L表示正交波束组内的波束数量，此例子中L＝4；
l表示层，本例子中，由于预编码的秩rank＝3，因此l＝0,1,2；
Figure PCTCN2019089337-appb-000009
表示第
Figure PCTCN2019089337-appb-000010
正交波束组中的第i个波束，可采用2D DFT向量。根据该表达式、系统的预定义以及选取的两个正交波束组(即第一正交波束组合第二正交波束组)，层0和层1(即l＝0,1时)使用第一正交波束组中的波束{1,2,7,8}；层2(即l＝2时)使用第二正交波束组中的波束{3,4,5,6}；
Figure PCTCN2019089337-appb-000011
表示作用于正交波束组中波束i、第一极化方向及层l的宽带幅度量化因子；
Figure PCTCN2019089337-appb-000012
表示作用于正交波束组中波束i、第一极化方向及层l的子带幅度量化因子；
c 0,l,i表示作用于正交波束组中波束i、第一极化方向及层l的子带相位量化因子；
Figure PCTCN2019089337-appb-000013
和
Figure PCTCN2019089337-appb-000014
表示相位调整因子，用于调整两个极化方向的波束间相位，其取值可以是
Figure PCTCN2019089337-appb-000015
该相位调整因子可以保证预编码矩阵中对应于第一正交波束组的前2列之间的正交性。
在另外一些实施例中，对于基于DFT压缩的码本结构，以rank＝3(即秩为3的预编码矩阵，层数为3)且2个极化方向为例来说，系统预定义每个正交波束组或频域基向量组对应预编码矩阵中的两层。即层0和层1对应第一正交波束组或第一频域基向量组，层2对应第二正交波束组或第二频域基向量组。根据图2所示，终端确定第一正交波束组包含波束{1,2,7,8}或第一频域基向量组包含频域基向量{1,2,7,8}，第二正交波束组包含波束{3,4}或第二频域基向量{3,4}。基于第一种预编码矩阵构造的预编码矩阵可表示为：
Figure PCTCN2019089337-appb-000016
其中，该块矩阵的每一列(两个块)对应一个层，每一行(一个块)对应一个极化方向。该预编码矩阵中的一个预编码可表示为：
对于l＝0,1有：
Figure PCTCN2019089337-appb-000017
对于l＝2有：
Figure PCTCN2019089337-appb-000018
其中，以采用正交波束组为例，上述表达式中相关参数的说明如下(采用频域基向量组时原理相同)：
L 0，L 1表示正交波束组内的波束数量，其取值可以相同也可以不同。此例子中L 0＝4，L 1＝2；
l表示层，本例子中，由于预编码的秩rank＝3，因此l＝0,1,2；
v i (n)表示正交波束组n中的第i个波束，可采用2D DFT向量。根据该表达式、系统的预定义以及选取的两个正交波束组(即第一正交波束组合第二正交波束组)，层0和层1(即l＝0,1时)使用第一正交波束组中的波束{1,2,7,8}；层2(即l＝2时)使用第二正交波束组中的波束{3,4}；
Figure PCTCN2019089337-appb-000019
表示频域压缩的频域基向量，可采用DFT向量。从N3O3个DFT基向量集合中选取。其中N3与系统配置的子带CQI的个数相关，O3为过采样因子。每层采用一个频域基向量组。不同层的频域基向量组可以相同也可以不同。如以上层l＝0,1中使用相同的频域基向量组，包含M0个基向量
Figure PCTCN2019089337-appb-000020
层l＝2使用与层l＝0,1不同的频域基向量组，包含M1个基向量
Figure PCTCN2019089337-appb-000021
较优的，M1≤M0。一种实施方式中，层l＝2中的频域基向量组从层l＝0,1中的频域基向量组中选取，即
Figure PCTCN2019089337-appb-000022
Figure PCTCN2019089337-appb-000023
p i,j,l表示作用于正交波束组中波束i、频域基向量组中基向量j及层l的幅度量化因子；
c i,j,l表示作用于正交波束组中波束i、频域基向量组中基向量j及层l的相位量化因子；
Figure PCTCN2019089337-appb-000024
和
Figure PCTCN2019089337-appb-000025
表示相位调整因子，用于调整两个极化方向的波束间相位，其取值可以是
Figure PCTCN2019089337-appb-000026
该相位调整因子可以保证预编码矩阵中对应于第一正交波束组的前2列之间的正交性。
根据上述公式(1)和公式(2)可以看出，层0对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000027
和
Figure PCTCN2019089337-appb-000028
)均采用相同的线性合并系数对第一正交波束组或第一频域基向量组中的所有向量进行线性合并得到，层1对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000029
和
Figure PCTCN2019089337-appb-000030
)均采用相同的线性合并系数对第一正交波束组或第一频域基向量组中的所有向量进行线性合并得到，层2对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000031
和
Figure PCTCN2019089337-appb-000032
)均采用相同的线性合并系数对第二正交波束组或第二频域基向量组中的所有向量进行线性合并得到。
同一正交波束组或同一频域基向量组对应的层之间通过相位调整因子保持相互正交，比如，第一正交波束组对应的层0和层1基于相位调整因子
Figure PCTCN2019089337-appb-000033
保持正交，即向量
Figure PCTCN2019089337-appb-000034
与
Figure PCTCN2019089337-appb-000035
正交。
再以rank＝4(即秩为4的预编码矩阵，层数为4)且2个极化方向为例来说，系统预定义每个正交波束组或每个频域基向量组对应预编码矩阵中的两层。即层0和层1对应第一正交波束组或第一频域基向量组，层2对应第二正交波束组或第二频域基向量组。根据图2所示，终端确定第一正交波束组包含波束{1,2,7,8}或第一频域基向量组包含频域基向量{1,2,7,8}，第二正交波束组包含波束{3,4,5,6}或第二频域基向量包含频域基向量{3,4,5,6}。基于第一种预编码矩阵构造的预编码矩阵可表示为：
Figure PCTCN2019089337-appb-000036
其中，该矩阵的每一列对应一个层，每一行对应一个极化方向。该预编码矩阵中的一个预编码可表示为：
Figure PCTCN2019089337-appb-000037
其中，以采用正交波束组为例，上述表达式中相关参数的说明如下(采用频域基向量组时原理相同)：
L表示正交波束组内的波束数量，此例子中L＝4；
l表示层，本例子中，由于预编码的秩rank＝4，因此l＝0,1,2,3；
Figure PCTCN2019089337-appb-000038
表示第
Figure PCTCN2019089337-appb-000039
正交波束组中的第i个波束，可采用2D DFT向量。根据该表达式、系统的预定义以及选取的两个正交波束组(即第一正交波束组合第二正交波束组)，层0和层1(即l＝0,1时)使用第一正交波束组中的波束{1,2,7,8}；层2和层3(即l＝2,3时)使用第二正交波束组中的波束{3,4,5,6}；
Figure PCTCN2019089337-appb-000040
表示作用于正交波束组中波束i、第一极化方向及层l的宽带幅度量化因子；
Figure PCTCN2019089337-appb-000041
表示作用于正交波束组中波束i、第一极化方向及层l的子带幅度量化因子；
c 0,l,i表示作用于正交波束组中波束i、第一极化方向及层l的子带相位量化因子；
Figure PCTCN2019089337-appb-000042
和
Figure PCTCN2019089337-appb-000043
表示相位调整因子，用于调整两个极化方向的波束间相位，其取值可以是
Figure PCTCN2019089337-appb-000044
该相位调整因子可以保证预编码矩阵中对应于第一正交波束组的前2列之间的正交性，以及保证预编码矩阵中对应于第二正交波束组的后2列之间的正交性。
根据上述公式(6)和公式(7)可以看出，层0对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000045
和
Figure PCTCN2019089337-appb-000046
)均采用相同的线性合并系数对第一正交波束组或第一频域基向量组中的所有向量进行线性合并得到，层1对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000047
和
Figure PCTCN2019089337-appb-000048
)均采用相同的线性合并系数对第一正交波束组或第一频域基向量组中的所有向量进行线性合并得到，层2对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000049
和
Figure PCTCN2019089337-appb-000050
)均采用相同的线性合并系数对第二正交波束组或第二频域基向量组中的所有向量进行线性合并得到，层3对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000051
和
Figure PCTCN2019089337-appb-000052
)均采用相同的线性合并系数对第二正交波束组或第二频域基向量组中的所有向量进行线性合并得到。
同一正交波束组或同一频域基向量组对应的层之间通过相位调整因子保持相互正交，比如，第一正交波束组对应的层0和层1基于相位调整因子
Figure PCTCN2019089337-appb-000053
保持正交，即向量
Figure PCTCN2019089337-appb-000054
与
Figure PCTCN2019089337-appb-000055
正交；再比如，第二正交波束组对应的层2和层3基于相位调整因子
Figure PCTCN2019089337-appb-000056
保持正交，即向量
Figure PCTCN2019089337-appb-000057
与
Figure PCTCN2019089337-appb-000058
正交。
(二)第二种预编码矩阵的构造
所述第二种预编码矩阵的构造具有如下特点：同一正交波束组或同一频域基向量组对应的预编码中，不同层的相同极化方向的预编码矩阵对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，并采用现有的向量正交化的方法保证层间的正交。
其中，若同一正交波束组或同一频域基向量组对应的预编码中，不同层的相同极化方向的预编码矩阵对应相同的线性合并系数，则可以降低反馈开销。
以rank＝3(即秩为3的预编码矩阵，层数为3)且2个极化方向为例来说，系统预定 义每个正交波束组或每个频域基向量组对应预编码矩阵中的两层。即层0和层1对应第一正交波束组或第一频域基向量组，层2对应第二正交波束组或第二频域基向量组。根据图2所示，终端确定第一正交波束组包含波束{1,2,7,8}或第一频域基向量组包含频域基向量{1,2,7,8}，第二正交波束组包含波束{3,4,5,6}或第二频域基向量组包含频域基向量{3,4,5,6}。基于第二种预编码矩阵构造的预编码矩阵可表示为：
Figure PCTCN2019089337-appb-000059
其中，该块矩阵的每一列(两块)对应一个层，每一行(一个块)对应一个极化方向。该预编码矩阵中的预编码可表示为：
Figure PCTCN2019089337-appb-000060
Figure PCTCN2019089337-appb-000061
其中，以采用正交波束组为例，上述表达式中相关参数的说明如下(采用频域基向量组时原理相同)：
L表示正交波束组内的波束数量，此例子中L＝4；
l表示层，本例子中，由于预编码的秩rank＝3，因此l＝0,1,2；
Figure PCTCN2019089337-appb-000062
表示第一正交波束组中的第i个波束，可采用2D DFT向量；
Figure PCTCN2019089337-appb-000063
表示第二正交波束组中的第i个波束，可采用2D DFT向量。根据该表达式、系统的预定义以及选取的两个正交波束组(即第一正交波束组和第二正交波束组)，层0和层1(即l＝0,1时)使用第一正交波束组中的波束{1,2,7,8}；层2(即l＝2时)使用第二正交波束组中的波束{3,4,5,6}；第一正交波束组与第二正交波束组中的波束个数也可以不相等，比如终端确定第一正交波束组包含波束{1,2,7,8}，第二正交波束组中若仅包含波束{3,4}，则层0和层1(即l＝0,1时)使用第一正交波束组中的波束{1,2,7,8}，层2(即l＝2时)使用第二正交波束组中的波束{3,4}。
r表示双极化天线阵列中的极化方向，其中，r＝0,1表示双极化天线阵列中的第一极化方向和第二极化方向；
Figure PCTCN2019089337-appb-000064
表示作用于正交波束组中波束i、极化方向r及层0的宽带幅度量化因子；
Figure PCTCN2019089337-appb-000065
表示作用于正交波束组中波束i、极化方向r及层0的子带幅度量化因子；
c r,0,i表示作用于正交波束组中波束i、极化方向r及层0的子带相位量化因子；
Figure PCTCN2019089337-appb-000066
表示作用于正交波束组中波束i、极化方向r及层2的宽带幅度量化因子；
Figure PCTCN2019089337-appb-000067
表示作用于正交波束组中波束i、极化方向r及层2的子带幅度量化因子；
c r,2,i表示作用于正交波束组中波束i、极化方向r及层2的子带相位量化因子；
Figure PCTCN2019089337-appb-000068
表示相位调整因子，其取值可以是
Figure PCTCN2019089337-appb-000069
该相位调整因子可以保证预编码矩阵中对应于第一正交波束组的前2列之间的正交性。
根据上述公式(8)、公式(9)和公式(10)可以看出，层0对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000070
和
Figure PCTCN2019089337-appb-000071
)均根据第一正交波束组或第一频域基向量组中的所有向量的线性合并波束得到，层1对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000072
和
Figure PCTCN2019089337-appb-000073
)均根据第一正交波束组或第一频域基向量组中的所有向量的线性合并波束并经过极化间相位调整得到，层2对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000074
和
Figure PCTCN2019089337-appb-000075
)均根据第二正交波束组或第二频域基向量组中的所有向量的线性合并波束得到。
第一正交波束组或第一频域基向量组对应的层0和层1的同一极化方向的预编码(
Figure PCTCN2019089337-appb-000076
和
Figure PCTCN2019089337-appb-000077
)对应相同的线性合并系数，预编码(
Figure PCTCN2019089337-appb-000078
和
Figure PCTCN2019089337-appb-000079
)对应相同的线性合并系数，并且预编码(
Figure PCTCN2019089337-appb-000080
和
Figure PCTCN2019089337-appb-000081
)所对应的线性合并系数与预编码(
Figure PCTCN2019089337-appb-000082
和
Figure PCTCN2019089337-appb-000083
)所对应的线性合并系数不相等，其分别独立确定。层0和层1之间利用现有的向量正交化方法，通过确定层1中两个极化方向的相位调整因子，而实现层间正交化。
以rank＝4(即秩为4的预编码矩阵，层数为4)且2个极化方向为例来说，系统预定义每个正交波束组或每个频域基向量组对应预编码矩阵中的两层。即层0和层1对应第一正交波束组或第一频域基向量组，层2对应第二正交波束组或第二频域基向量组。根据图2所示，终端确定第一正交波束组包含波束{1,2,7,8}或第一频域基向量组包含频域基向量{1,2,7,8}，第二正交波束组包含波束{3,4,5,6}或第二频域基向量组包含频域基向量{3,4,5,6}。基于第二种预编码矩阵构造的预编码矩阵可表示为：
Figure PCTCN2019089337-appb-000084
其中，该矩阵的每一列对应一个层，每一行对应一个极化方向。该预编码矩阵中的预编码可表示为：
Figure PCTCN2019089337-appb-000085
Figure PCTCN2019089337-appb-000086
其中，以采用正交波束组为例，上述表达式中相关参数的说明如下(采用频域基向量组时原理相同)：
L表示正交波束组内的波束数量，此例子中L＝4；
l表示层，本例子中，由于预编码的秩rank＝4，因此l＝0,1,2,3；
Figure PCTCN2019089337-appb-000087
表示第一正交波束组中的第i个波束，可采用2D DFT向量；
Figure PCTCN2019089337-appb-000088
表示第二正交波束组中的第i个波束，可采用2D DFT向量。根据该表达式、系统的预定义以及选取的两个正交波束组(即第一正交波束组合第二正交波束组)，层0和层1(即l＝0,1时)使用第一正交波束组中的波束{1,2,7,8}；层2和层3(即l＝2,3时)使用第二正交波束组中的波束{3,4,5,6}；第一正交波束组与第二正交波束组中的波束个数也可以不相等，比如终端确定第一正交波束组包含波束{1,2,7,8}，第二正交波束组中若仅包含波束{3,4}，则层0和层1(即l＝0,1时)使用第一正交波束组中的波束{1,2,7,8}；层2和层3(即l＝2,3时)使用第二正交波束组中的波束{3,4}。
r表示双极化天线阵列中的极化方向，其中，r＝0,1表示双极化天线阵列中的第一极化方向和第二极化方向；
Figure PCTCN2019089337-appb-000089
表示作用于正交波束组中波束i、极化方向r及层0的宽带幅度量化因子；
Figure PCTCN2019089337-appb-000090
表示作用于正交波束组中波束i、极化方向r及层0的子带幅度量化因子；
c r,0,i表示作用于正交波束组中波束i、极化方向r及层0的子带相位量化因子；
Figure PCTCN2019089337-appb-000091
表示作用于正交波束组中波束i、极化方向r及层2的宽带幅度量化因子；
Figure PCTCN2019089337-appb-000092
表示作用于正交波束组中波束i、极化方向r及层2的子带幅度量化因子；
c r2i表示作用于正交波束组中波束i、极化方向r及层2的子带相位量化因子；
Figure PCTCN2019089337-appb-000093
和
Figure PCTCN2019089337-appb-000094
表示相位调整因子，其取值可以是
Figure PCTCN2019089337-appb-000095
相位调整因子
Figure PCTCN2019089337-appb-000096
可以保证预编码矩阵中对应于第一正交波束组的前2列之间的正交性，相位调整因子
Figure PCTCN2019089337-appb-000097
可以保证预编码矩阵中对应于第二正交波束组的后2列之间的正交性。
根据上述公式(11)、公式(12)和公式(13)可以看出，层0和层1分别对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000098
和
Figure PCTCN2019089337-appb-000099
和
Figure PCTCN2019089337-appb-000100
)均根据第一正交波束组或第一频域基向量组中的所有向量的线性合并波束得到，层2和层3分别对应的两个极化方向的预编码(
Figure PCTCN2019089337-appb-000101
和
Figure PCTCN2019089337-appb-000102
和
Figure PCTCN2019089337-appb-000103
)均根据第二正交波束组或第二频域基向量组中的所有向量的线性合并波束得到。
第一正交波束组或第一频域基向量组对应的层0和层1的同一极化方向的预编码(
Figure PCTCN2019089337-appb-000104
和
Figure PCTCN2019089337-appb-000105
)对应相同的线性合并系数，预编码(
Figure PCTCN2019089337-appb-000106
和
Figure PCTCN2019089337-appb-000107
)对应相同的线性合并系数，并且预编码(
Figure PCTCN2019089337-appb-000108
和
Figure PCTCN2019089337-appb-000109
)所对应的线性合并系数与预编码(
Figure PCTCN2019089337-appb-000110
和
Figure PCTCN2019089337-appb-000111
)所对应的线性合并系数不相等，其分别独立确定。层0和层1之间利用现有的向量正交化方法，通过确定层1中两个极化方向的相位调整因子，而实现层间正交化。第二正交波束组或第二频域基向量组对应的层2和层3的同一极化方向的预编码(
Figure PCTCN2019089337-appb-000112
和
Figure PCTCN2019089337-appb-000113
)对应相同的线性合并系数，预编码(
Figure PCTCN2019089337-appb-000114
和
Figure PCTCN2019089337-appb-000115
)对应相同的线性合并系数，并且预编码(
Figure PCTCN2019089337-appb-000116
和
Figure PCTCN2019089337-appb-000117
)所对应的线性合并系数与预编码(
Figure PCTCN2019089337-appb-000118
和
Figure PCTCN2019089337-appb-000119
)所对应的线性合并系数不相等，其分别独立确定。层2和层3之间利用现有的向量正交化方法，通过确定层3中两个极化方向的相位调整因子，而实现层间正交化。
(三)第三种预编码矩阵的构造
所述第三种预编码矩阵的构造具有如下特点：同一层的不同极化方向的预编码采用相同的线性合并系数构造，且不同极化方向之间相差一个相位调整因子。同一频域基向量组对应的层之间通过相位调整因子保持相互正交，不同频域基向量组对应的层之间通过频域基向量组中基向量的正交性保持层间的正交。
对于基于DFT压缩的码本结构，以rank＝3(即秩为3的预编码矩阵，层数为3)且2个极化方向为例来说，系统预定义每个正交波束组或每个频域基向量组对应预编码矩阵中的两层。即层0和层1对应第一正交波束组或第一频域基向量组，层2对应第二正交波束组或第二频域基向量组。根据图2所示，终端确定第一正交波束组包含波束{1,2,7,8}或第一频域基向量组包含频域基向量{1,2,7,8}，第二正交波束组包含波束{1,2}或第二频域基向量组包含频域基向量{1,2}。此时两个正交波束组或两个频域基向量组间不正交。基于第一种预编码矩阵构造的预编码矩阵可表示为：
Figure PCTCN2019089337-appb-000120
其中，该块矩阵的每一列(两个块)对应一个层，每一行(一个块)对应一个极化方向。该预编码矩阵中的一个预编码可表示为：
对于l＝0,1有：
Figure PCTCN2019089337-appb-000121
对于l＝2有：
Figure PCTCN2019089337-appb-000122
其中，以采用正交波束组为例，上述表达式中相关参数的说明如下(采用频域基向量组时原理相同)：
L 0，L 1表示正交波束组内的波束数量，其取值可以相同也可以不同。此例子中L 0＝4，L 1＝2；
l表示层，本例子中，由于预编码的秩rank＝3，因此l＝0,1,2；
v i (n)表示正交波束组n中的第i个波束，可采用2D DFT向量。根据该表达式、系统的预定义以及选取的两个正交波束组(即第一正交波束组合第二正交波束组)，层0和层1(即l＝0,1时)使用第一正交波束组中的波束{1,2,7,8}；层2(即l＝2时)使用第二正交波束组中的波束{1,2}；
Figure PCTCN2019089337-appb-000123
表示频域压缩的频域基向量，可采用DFT向量。从N3O3个DFT基向量集合中选取。其中N3与系统配置的子带CQI的个数相关，O3为过采样因子。每层采用一个频域基向量组。不同层的频域基向量组中的基向量可以相同也可以不同。如以上层l＝0,1中使用相同第一频域基向量组，包含M0个基向量
Figure PCTCN2019089337-appb-000124
层l＝2使用与层l＝0,1不同的第二频域基向量组，包含M1个基向量
Figure PCTCN2019089337-appb-000125
且层l＝2中使用的第二频域基向量组中的每个频域基向量与层l＝0,1中使用的第一频域基向量组中的每个频域基向量相互正交。较优的，M1≤M0。
p i,j,l表示作用于正交波束组中波束i、频域基向量组中基向量j及层l的幅度量化因子；
c i,j,l表示作用于正交波束组中波束i、频域基向量组中基向量j及层l的相位量化因子；
Figure PCTCN2019089337-appb-000126
和
Figure PCTCN2019089337-appb-000127
表示相位调整因子，用于调整两个极化方向的波束间相位，其取值可以是
Figure PCTCN2019089337-appb-000128
该相位调整因子可以保证预编码矩阵中对应于第一频域基向量组的前2列之间的正交性。
参见图3，为本申请实施例提供的信道状态信息反馈流程示意图。该流程以采用正交波束组为例描述，采用频域基向量组时的信息状态信息反馈流程原理相同。
如图所示，该流程可包括：
S301：终端确定N个正交波束组，N为大于或等于1的整数。
其中，终端可基于信道测量的结果确定N个正交波束组。
终端可根据预编码矩阵的秩的取值，以及一个正交波束组可用于构造预编码矩阵中几个层的预编码，确定需要使用的正交波束组的数量，并从候选波束集合中选取相应数量的正交波束组。其中，预编码矩阵的秩的取值，可由基站指示给终端，也可以由终端根据信道测量确定得到。所述候选波束集合的确定方法可参见前述描述，在此不再重复。
例如，若预编码矩阵的秩为rank＝3，且一个正交波束组用于构造预编码矩阵中的2个层对应的预编码(即一个正交波束组用于构造预编码矩阵中的2列预编码)，则终端可确定出需要2个正交波束组来构造rank＝3的预编码矩阵。
可选地，可根据信道测量结果，从候选波束集合中选取正交波束组。比如，终端可根据信道测量的结果，计算不同波束的接收功率，选择功率最大的前L个正交的波束构成第一正交波束组，选择功率次之的L个正交的波束构成第二正交波束组。比如选取图2中的波束{1,2,7,8}构成第一正交波束组，选取波束{3,4,5,6}构成第二正交波束组。
S302：终端根据上述N个正交波束组中的波束，确定用于构造所述预编码矩阵的线性合并系数。
其中，所述线性合并系数包括所述预编码矩阵中每层对应的线性合并系数。
可选地，所述线性合并系数包括以下参数：幅度量化因子和相位量化因子。其中，幅度量化因子可包括宽带幅度量化因子和/或子带幅度量化因子；相位量化因子可包括宽带相位量化因子和/或子带相位量化因子。
可选地，所述的线性合并系数(比如宽带幅度量化因子、子带幅度量化因子)可以基于已有的Type II码本实现，如将信道的特征向量在正交的波束组上投影，获得相应的系数，并进行量化。
在采用上述第一种预编码矩阵构造的例子中，终端基于第一种预编码矩阵的构造，以及上述N个正交波束组中的波束，确定该预编码矩阵中每个层对应的预编码的线性合并系 数。其中，同一层的不同极化方向对应相同的线性合并系数，同一正交波束组对应的层之间通过相位调整因子相互正交。
其中，对于相位调整因子，可以采用遍历搜索的方式确定。
由于第一种预编码矩阵的构造中，一方面，同一层的不同极化方向的预编码是根据同一正交波束组中的波束并采用相同的线性合并系数构造的，因此，针对同一层的不同极化方向的预编码，只要确定并反馈该层中一个极化方向对应的线性合并系数即可，无需针对不同极化方向分别确定并反馈线性合并系数，因此可以减少反馈开销。另一方面，不同正交波束组对应的层之间通过波束的正交保证了层之间的相互正交。
以上述rank＝3的预编码矩阵的构造为例，只要确定层0至层2中，每层的一个极化方向对应的宽带幅度量化因子、每层的一个极化方向对应的子带幅度量化因子、每层的一个极化方向对应的子带相位量化因子，以及层0和层2的相位调整因子即可，无需针对两个不同的极化方向分别计算和反馈线性合并系数。
再以上述rank＝4的预编码矩阵的构造为例，只要确定层0至层3中每层的一个极化方向对应的宽带幅度量化因子、每层的一个极化方向对应的子带幅度量化因子、每层的一个极化方向对应的子带相位量化因子，以及层0和层2的相位调整因子即可，无需针对两个不同的极化方向分别计算和反馈线性合并系数。
在采用上述第二种预编码矩阵构造的例子中，终端基于第二种预编码矩阵的构造，以及上述N个正交波束组中的波束，确定用于构造该预编码矩阵的线性合并系数。其中，同一正交波束组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数。进一步地，可以采用现有的向量正交化的方法保证层间的正交。
其中，不同层之间可利用现有的向量正交化方法，通过一个层中不同极化方向的相位调整因子来保证层间的正交。
由于第二种预编码矩阵的构造中，一方面，在一个正交波束组用于构造多个层的预编码时(即一个正交波束组用于构造至少2列预编码时)，同一正交波束组对应的多个层中，不同层的相同极化方向可以对应相同的线性合并系数，因此针对同一正交波束组对应的多个层的预编码，只要确定并反馈不同极化方向对应的线性合并系数即可，无需针对不同层分别确定并反馈线性合并系数，因此可以减少反馈开销。另一方面，由于同一正交波束组对应的不同层之间，采用现有的向量正交化的方法保证层间的正交，不同正交波束组对应的层之间通过正交波束组内的波束间的正交性，保证了不同层间的正交，因此可以实现预编码矩阵中所有层之间的正交。降低层间干扰。
以上述rank＝3的预编码矩阵的构造为例，可针对第一正交波束组对应的层0和层1的第一极化方向和第二极化方向分别确定相应极化方向对应的宽带幅度量化因子、子带幅度量化因子、子带相位量化因子即可，无需针对同一极化方向中层0和层1分别计算和反馈线性合并系数。
再以上述rank＝4的预编码矩阵的构造为例，可针对第一正交波束组对应的层0和层1的第一极化方向和第二极化方向分别确定相应极化方向对应的宽带幅度量化因子、子带幅度量化因子、子带相位量化因子，并针对第二正交波束组对应的层2和层3的第一极化方向和第二极化方向分别确定相应极化方向对应的宽带幅度量化因子、子带幅度量化因子、子带相位量化因子，无需针对同一极化方向中两个不同的层分别计算和反馈线性合并系数。
S303：终端向基站反馈信道状态信息，所述信道状态信息包括所述N个正交波束组的指示信息以及S302中确定出的所述预编码矩阵的线性合并系数。
其中，终端反馈的预编码矩阵的线性合并系数中包括Y个层对应的线性合并系数。Y的取值小于或等于所述预编码矩阵的层数。可选地，Y个层的选择由系统预定义或由高层信令指示给终端。
其中，N个正交波束组的指示信息，用于指示终端所选择的N个正交波束组以及每个正交波束组中包含的波束。
可选地，终端反馈的信道状态信息还可包括所述预编码矩阵中S个层对应的相位调整因子，S小于或等于预编码矩阵的层数。可选地，S个层的选择由系统预定义或由高层信令指示给终端。
在采用上述第一种预编码矩阵构造的例子中，以上述rank＝3的预编码矩阵为例，终端反馈的预编码的线性合并系数可包括：层0的预编码(
Figure PCTCN2019089337-appb-000129
和
Figure PCTCN2019089337-appb-000130
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000131
子带幅度量化因子
Figure PCTCN2019089337-appb-000132
以及子带相位量化因子c 0,0,i，层1的预编码(
Figure PCTCN2019089337-appb-000133
和
Figure PCTCN2019089337-appb-000134
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000135
子带幅度量化因子
Figure PCTCN2019089337-appb-000136
以及子带相位量化因子c 0,1,i，层2预编码(
Figure PCTCN2019089337-appb-000137
和
Figure PCTCN2019089337-appb-000138
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000139
子带幅度量化因子
Figure PCTCN2019089337-appb-000140
以及子带相位量化因子c 0,2,i。还包括层0的相位调整因子
Figure PCTCN2019089337-appb-000141
和层2的相位调整因子
Figure PCTCN2019089337-appb-000142
即仅反馈S＝2层的相位调整因子。
在采用上述第一种预编码矩阵构造的例子中，以上述rank＝4的预编码矩阵为例，终端反馈的预编码的线性合并系数可包括：层0的预编码(
Figure PCTCN2019089337-appb-000143
和
Figure PCTCN2019089337-appb-000144
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000145
子带幅度量化因子
Figure PCTCN2019089337-appb-000146
以及子带相位量化因子c 0,0,i，层1的预编码(
Figure PCTCN2019089337-appb-000147
和
Figure PCTCN2019089337-appb-000148
) 对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000149
子带幅度量化因子
Figure PCTCN2019089337-appb-000150
以及子带相位量化因子c 0,1,i，层2的预编码(
Figure PCTCN2019089337-appb-000151
和
Figure PCTCN2019089337-appb-000152
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000153
子带幅度量化因子
Figure PCTCN2019089337-appb-000154
以及子带相位量化因子c 02i，层3的预编码(
Figure PCTCN2019089337-appb-000155
和
Figure PCTCN2019089337-appb-000156
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000157
子带幅度量化因子
Figure PCTCN2019089337-appb-000158
以及子带相位量化因子c 0,3,i。还包括层0的相位调整因子
Figure PCTCN2019089337-appb-000159
和层2的相位调整因子
Figure PCTCN2019089337-appb-000160
即仅反馈S＝2层的相位调整因子。
在采用上述第二种预编码矩阵构造的例子中，以上述rank＝3的预编码矩阵为例，终端反馈的预编码的线性合并系数可包括：层0和层1的第一极化方向的预编码(
Figure PCTCN2019089337-appb-000161
和
Figure PCTCN2019089337-appb-000162
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000163
子带幅度量化因子
Figure PCTCN2019089337-appb-000164
以及子带相位量化因子c 0,0,i，层0和层1的第二极化方向的预编码(
Figure PCTCN2019089337-appb-000165
和
Figure PCTCN2019089337-appb-000166
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000167
子带幅度量化因子
Figure PCTCN2019089337-appb-000168
以及子带相位量化因子c 10i，层2的第一极化方向的预编码
Figure PCTCN2019089337-appb-000169
对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000170
子带幅度量化因子
Figure PCTCN2019089337-appb-000171
以及子带相位量化因子c 0,2,i，层2的第二极化方向的预编码
Figure PCTCN2019089337-appb-000172
对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000173
子带幅度量化因子
Figure PCTCN2019089337-appb-000174
以及子带相位量化因子c 1,2,i。可以看出，针对层0和层1，只反馈其中一层的两个极化方向对应的线性合并系数即可，即仅反馈Y＝2层的线性合并系数。
在采用上述第二种预编码矩阵构造的例子中，再以上述rank＝4的预编码矩阵为例，终端反馈的预编码的线性合并系数可包括：层0和层1的第一极化方向的预编码(
Figure PCTCN2019089337-appb-000175
和
Figure PCTCN2019089337-appb-000176
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000177
子带幅度量化因子
Figure PCTCN2019089337-appb-000178
以及子带相位量化因子c 0,0,i，层0和层1的第二极化方向的预编码(
Figure PCTCN2019089337-appb-000179
和
Figure PCTCN2019089337-appb-000180
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000181
子带幅度量化因子
Figure PCTCN2019089337-appb-000182
以及子带相位量化因子c 10i，层2和层3的第一极化方向的预编码(
Figure PCTCN2019089337-appb-000183
和
Figure PCTCN2019089337-appb-000184
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000185
子带幅度量化因子
Figure PCTCN2019089337-appb-000186
以及子带相位量化因子c 0,2,i，层2和层3的第二极化方向的预编码(
Figure PCTCN2019089337-appb-000187
和
Figure PCTCN2019089337-appb-000188
)对应的宽带幅度量化因子
Figure PCTCN2019089337-appb-000189
子带幅度量化因子
Figure PCTCN2019089337-appb-000190
以及子带相位量化因子c 1,2,i。可以看出，针对层0和层1，只反馈其中一层的两个极化方向对应的线性合并系数即可，针对层2和层3，只反馈其中一层的两个极化方向对应的线性合并系数即可，即仅反馈Y＝2层的线性合并系数。
S304：基站根据终端发送的信道状态信息以及所指示的正交波束组，构造预编码矩阵，该预编码矩阵用于基站和该终端之间的数据传输。
该步骤中，基站可根据接收到的信道状态信息以及正交波束组的指示信息，并根据预编码矩阵的结构，构造预编码矩阵。
在本申请的一些实施例中，在S302中，终端可以确定S个频域基向量组(S为大于或等于1的整数)，并根据所述N个正交波束组中的波束向量和所述S个频域基向量组，确定用于构造所述预编码矩阵的线性合并系数。其中，所述S个频域基向量组中，层索引较大的层使用的频域基向量组中的频域基向量，是从层索引较小的层使用的频域基向量组中选取的。可选地，所述S个频域基向量组中的频域基向量可相互正交也可不正交，所述S个频域基向量组之间可相互正交也可不正交，本申请实施例对此不做限制。
在采用频域基向量组时，在一些实施例中，终端根据N个频域基向量组中的向量，确定用于构造预编码矩阵的线性合并系数的步骤中，终端可以确定S个波束组(S为大于或等于1的整数)，并根据N个频域基向量组中的向量和所述S个波束组，确定用于构造预编码矩阵的线性合并系数。其中，所述S个波束组中，层索引较大的层使用的波束组中的波束向量，是从层索引较小的层使用的波束组中选取的。可选地，所述S个波束组中的波束可相互正交也可不正交，所述S个波束组之间可相互正交也可不正交，本申请实施例对此不做限制。
参见图4，为本申请实施例提供的终端的结构示意图。该终端可实现前述实施例描述的流程。
如图4所示，该终端可包括：正交向量组确定模块401、线性合并系数确定模块402以及反馈模块403。
正交向量组确定模块401，用于确定N个正交向量组，N为大于或等于1的整数；其中，同一正交向量组内的波束相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，M为大于或等于1的整数。
线性合并系数确定模块402，用于根据所述N个正交向量组中的波束，确定用于构造所述预编码矩阵的线性合并系数；其中，所述线性合并系数包括所述预编码矩阵中每个层对应的线性合并系数。
反馈模块403，用于向基站反馈信道状态信息，所述信道状态信息包括所述N个正交向量组的指示信息以及确定出的所述预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数。
可选地，所述不同的正交向量组间的向量相互正交。
可选地，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
可选地，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同 层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
可选地，所述信道状态信息还包括：
所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
可选地，所述线性合并系数包括以下参数：
幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；
相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
可选地，所述N个正交向量组中每个组内的向量个数相同或不同。
可选地，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
可选地，所述正交向量组为正交波束组时，所述线性合并系数确定模块402具体用于：
确定S个频域基向量组，S为大于或等于1的整数；
根据所述N个正交波束组中的波束向量和所述S个频域基向量组，确定用于构造所述预编码矩阵的线性合并系数。
可选地，所述S个频域基向量组中，层索引较大的层使用的频域基向量组中的频域基向量，是从层索引较小的层使用的频域基向量组中选取的。
可选地，所述正交向量组为频域基向量组时，所述线性合并系数确定模块402具体用于：
确定S个波束组，S为大于或等于1的整数；
根据所述N个频域基向量组中的向量和所述S个波束组，确定用于构造所述预编码矩阵的线性合并系数。
可选地，所述S个波束组中，层索引较大的层使用的波束组中的波束向量，是从层索引较小的层使用的波束组中选取的。
参见图5，为本申请实施例提供的基站的结构示意图。该终端可实现前述实施例描述的流程。
如图5所示，该基站可包括：接收模块501、预编码矩阵确定模块502。
接收模块501，用于接收终端反馈的信道状态信息，所述信道状态信息包括N个正交向量组的指示信息以及所述终端确定的用于构造预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数；其中，所述N个正交向量组中，同一正交向量组内的波束相互正交，一个正交向量组用于构造预编码矩阵中M个层对 应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，N和M均为大于或等于1的整数。
预编码矩阵确定模块502，用于根据所述信道状态信息构造所述预编码矩阵。
可选地，所述不同的正交向量组间的向量相互正交。
可选地，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
可选地，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
可选地，所述信道状态信息还包括：
所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
可选地，所述线性合并系数包括以下参数：
幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；
相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
可选地，所述N个正交向量组中每个组内的向量个数相同或不同。
可选地，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；
或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
参见图6，为本申请实施例提供的通信装置的结构示意图。该通信装置可实现前述实施例描述的终端侧流程。如图所示，该通信装置可包括：处理器601、存储器602、收发机603以及总线接口604。
处理器601负责管理总线架构和通常的处理，存储器602可以存储处理器601在执行操作时所使用的数据。收发机603用于在处理器601的控制下接收和发送数据。
总线架构可以包括任意数量的互联的总线和桥，具体由处理器601代表的一个或多个处理器和存储器602代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口604提供接口。处理器601负责管理总线架构和通常的处理，存储器602可以存储处理器601在执行操作时所使用的数据。
本申请实施例揭示的流程，可以应用于处理器601中，或者由处理器601实现。在实现过程中，处理流程的各步骤可以通过处理器601中的硬件的集成逻辑电路或者软件形式的指令完成。处理器601可以是通用处理器、数字信号处理器、专用集成电路、现场可编 程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器602，处理器601读取存储器602中的信息，结合其硬件完成信号处理流程的步骤。
具体地，处理器601，用于读取存储器602中的程序并执行：
确定N个正交向量组，N为大于或等于1的整数；其中，同一正交向量组内的波束相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，M为大于或等于1的整数。
根据所述N个正交向量组中的波束，确定用于构造所述预编码矩阵的线性合并系数；其中，所述线性合并系数包括所述预编码矩阵中每个层对应的线性合并系数。
向基站反馈信道状态信息，所述信道状态信息包括所述N个正交向量组的指示信息以及确定出的所述预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数。
可选地，所述不同的正交向量组间的向量相互正交。
可选地，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
可选地，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
可选地，所述信道状态信息还包括：
所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
可选地，所述线性合并系数包括以下参数：
幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；
相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
可选地，所述N个正交向量组中每个组内的向量个数相同或不同。
可选地，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
可选地，所述正交向量组为正交波束组时，所述处理器601具体用于：
确定S个频域基向量组，S为大于或等于1的整数；
根据所述N个正交波束组中的波束向量和所述S个频域基向量组，确定用于构造所述预编码矩阵的线性合并系数。
可选地，所述S个波束组中，层索引较大的层使用的波束组中的波束向量，是从层索引较小的层使用的波束组中选取的。
可选地，所述正交向量组为频域基向量组时，所述处理器601具体用于：
确定S个波束组，S为大于或等于1的整数；
根据所述N个频域基向量组中的向量和所述S个波束组，确定用于构造所述预编码矩阵的线性合并系数。
可选地，所述S个波束组中，层索引较大的层使用的波束组中的波束向量，是从层索引较小的层使用的波束组中选取的。
参见图7，为本申请实施例提供的通信装置的结构示意图。该通信装置可实现前述实施例描述的基站侧流程。如图所示，该通信装置可包括：处理器701、存储器702、收发机703以及总线接口704。
处理器701负责管理总线架构和通常的处理，存储器702可以存储处理器701在执行操作时所使用的数据。收发机703用于在处理器701的控制下接收和发送数据。
总线架构可以包括任意数量的互联的总线和桥，具体由处理器701代表的一个或多个处理器和存储器702代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口704提供接口。处理器701负责管理总线架构和通常的处理，存储器702可以存储处理器701在执行操作时所使用的数据。
本申请实施例揭示的流程，可以应用于处理器701中，或者由处理器701实现。在实现过程中，处理流程的各步骤可以通过处理器701中的硬件的集成逻辑电路或者软件形式的指令完成。处理器701可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器702，处理器701读取存储器702中的 信息，结合其硬件完成信号处理流程的步骤。
具体地，处理器701，用于读取存储器702中的程序并执行：
接收终端反馈的信道状态信息，所述信道状态信息包括N个正交向量组的指示信息以及所述终端确定的用于构造预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数；其中，所述N个正交向量组中，同一正交向量组内的波束相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，N和M均为大于或等于1的整数。
根据所述信道状态信息构造所述预编码矩阵。
可选地，所述不同的正交向量组间的向量相互正交。
可选地，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
可选地，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
可选地，所述信道状态信息还包括：
所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
可选地，所述线性合并系数包括以下参数：
幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；
相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
可选地，所述N个正交向量组中每个组内的向量个数相同或不同。
可选地，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；
或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
基于相同的技术构思，本申请实施例还提供了一种计算机可读存储介质。所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行前述实施例中终端侧所执行的流程。
基于相同的技术构思，本申请实施例还提供了一种计算机可读存储介质。所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行前述实施例中基站侧所执行的流程。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流 程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (26)

  1. 一种信道状态信息反馈方法，其特征在于，包括：
    终端确定N个正交向量组，N为大于或等于1的整数；其中，同一正交向量组内的向量相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，M为大于或等于1的整数；
    所述终端根据所述N个正交向量组中的向量，确定用于构造所述预编码矩阵的线性合并系数；其中，所述线性合并系数包括所述预编码矩阵中每层对应的线性合并系数；
    所述终端向基站反馈信道状态信息，所述信道状态信息包括所述N个正交向量组的指示信息以及确定出的所述预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数。
  2. 如权利要求1所述的方法，其特征在于，所述不同的正交向量组间的向量相互正交。
  3. 如权利要求1所述的方法，其特征在于，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
  4. 如权利要求1所述的方法，其特征在于，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
  5. 如权利要求1所述的方法，其特征在于，所述信道状态信息还包括：
    所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
  6. 如权利要求1所述的方法，其特征在于，所述线性合并系数包括以下参数：
    幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；
    相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
  7. 如权利要求1-6中任一项所述的方法，其特征在于，所述N个正交向量组中每个组内的向量个数相同或不同。
  8. 如权利要求1-6中任一项所述的方法，其特征在于，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；
    或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
  9. 如权利要求8所述的方法，其特征在于，所述正交向量组为正交波束组时，所述终端根据所述N个正交向量组中的向量，确定用于构造所述预编码矩阵的线性合并系数， 包括：
    所述终端确定S个频域基向量组，S为大于或等于1的整数；
    所述终端根据所述N个正交波束组中的波束向量和所述S个频域基向量组，确定用于构造所述预编码矩阵的线性合并系数。
  10. 如权利要求9中所述的方法，其特征在于，所述S个频域基向量组中，层索引较大的层使用的频域基向量组中的频域基向量，是从层索引较小的层使用的频域基向量组中选取的。
  11. 如权利要求8所述的方法，其特征在于，所述正交向量组为频域基向量组时，所述终端根据所述N个频域基向量组中的向量，确定用于构造所述预编码矩阵的线性合并系数，包括：
    所述终端确定S个波束组，S为大于或等于1的整数；
    所述终端根据所述N个频域基向量组中的向量和所述S个波束组，确定用于构造所述预编码矩阵的线性合并系数。
  12. 如权利要求11所述的方法，其特征在于，所述S个波束组中，层索引较大的层使用的波束组中的波束向量，是从层索引较小的层使用的波束组中选取的。
  13. 一种预编码矩阵确定方法，其特征在于，包括：
    基站接收终端反馈的信道状态信息，所述信道状态信息包括N个正交向量组的指示信息以及所述终端确定的用于构造预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数；其中，所述N个正交向量组中，同一正交向量组内的向量相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，N和M均为大于或等于1的整数；
    所述基站根据所述信道状态信息构造所述预编码矩阵。
  14. 如权利要求13所述的方法，其特征在于，所述不同的正交向量组间的向量相互正交。
  15. 如权利要求13所述的方法，其特征在于，所述预编码矩阵的线性合并系数中，同一层的不同极化方向对应相同的线性合并系数，同一正交向量组对应的层之间通过相位调整因子相互正交。
  16. 如权利要求13所述的方法，其特征在于，所述预编码矩阵的线性合并系数中，同一正交向量组对应的多个层中，不同层的相同极化方向对应相同或不同的线性合并系数、同一层的不同极化方向对应不同的线性合并系数，且不同层之间相互正交。
  17. 如权利要求13所述的方法，其特征在于，所述信道状态信息还包括：
    所述终端确定的所述预编码矩阵中S个层对应的相位调整因子，其中，S小于或等于所述预编码矩阵的层数。
  18. 如权利要求13所述的方法，其特征在于，所述线性合并系数包括以下参数：
    幅度量化因子，所述幅度量化因子包括宽带幅度量化因子和/或子带幅度量化因子；
    相位量化因子，所述相位量化因子包括宽带相位量化因子和/或子带相位量化因子。
  19. 如权利要求13-18中任一项所述的方法，其特征在于，所述N个正交向量组中每个组内的向量个数相同或不同。
  20. 如权利要求13-18中任一项所述的方法，其特征在于，所述正交向量组为正交波束组，所述正交波束组中包括至少一个波束向量；
    或者，所述正交向量组为频域基向量组，所述频域向量组中包括至少一个频域基向量。
  21. 一种终端，其特征在于，包括：
    正交向量组确定模块，用于确定N个正交向量组，N为大于或等于1的整数；其中，同一正交向量组内的向量相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，M为大于或等于1的整数；
    线性合并系数确定模块，用于根据所述N个正交向量组中的向量，确定用于构造所述预编码矩阵的线性合并系数；其中，所述线性合并系数包括所述预编码矩阵中每个层对应的线性合并系数；
    反馈模块，用于向基站反馈信道状态信息，所述信道状态信息包括所述N个正交向量组的指示信息以及确定出的所述预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数。
  22. 一种基站，其特征在于，包括：
    接收模块，用于接收终端反馈的信道状态信息，所述信道状态信息包括N个正交向量组的指示信息以及所述终端确定的用于构造预编码矩阵的线性合并系数中Y个层对应的线性合并系数，其中Y小于或等于所述预编码矩阵的层数；其中，所述N个正交向量组中，同一正交向量组内的向量相互正交，一个正交向量组用于构造预编码矩阵中M个层对应的预编码，不同的正交向量组构造预编码矩阵中不同层对应的预编码，N和M均为大于或等于1的整数；
    预编码矩阵确定模块，用于根据所述信道状态信息构造所述预编码矩阵。
  23. 一种通信装置，其特征在于，包括：处理器、存储器和收发机；所述处理器，用于读取所述存储器中的程序，执行如权利要求1-12中任一项所述的方法。
  24. 一种通信装置，其特征在于，包括：处理器、存储器和收发机；所述处理器，用于读取所述存储器中的程序，执行如权利要求13-20中任一项所述的方法。
  25. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行如权利要求1至12中任一项所述的方法。
  26. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行如权利要求13至20中任一项所述的方法。
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