CN107733494B - Precoding method, and channel state information determining method and device - Google Patents
Precoding method, and channel state information determining method and device Download PDFInfo
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Abstract
The invention discloses a precoding method, a channel state information determining method and a channel state information determining device. In the precoding method provided by the invention, after a base station determines a precoding matrix set used by a terminal, a corresponding relation between a precoding matrix in the precoding matrix set and resources allocated to the terminal is determined, and data of the terminal is precoded by using the precoding matrix in the precoding matrix set according to the corresponding relation. In the method for determining the channel state information, a terminal determines a used precoding matrix set, determines the corresponding relation between a precoding matrix in the precoding matrix set and resources corresponding to the channel state information, and determines the channel state information by using the precoding matrix in the precoding matrix set according to the corresponding relation. The invention provides an open-loop MIMO transmission scheme suitable for DMRS demodulation.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a precoding method, a channel state information determining method, and an apparatus.
Background
A Long Term Evolution (Long Term Evolution, LTE for short) Rel-8 system introduces a closed-loop precoding technology to improve the spectrum efficiency. Closed-loop precoding requires that the same set of precoding matrices, called codebook, is stored at both the base station and the terminal. After estimating the channel information according to the cell common pilot frequency, the terminal selects a pre-coding matrix from the codebook according to a certain criterion. The selected criteria may be maximizing mutual information amount, maximizing output signal-to-interference-and-noise ratio, etc. And the terminal feeds back the index of the selected precoding Matrix in the codebook to the base station through an uplink channel, wherein the index is marked as PMI (precoding Matrix indicator). And the base station determines a precoding matrix which is used by the terminal according to the received index value. The precoding matrix reported by the terminal can be regarded as a quantized value of the channel state information.
The closed-loop precoding technique relies on feedback from the terminal to select transmission parameters. Under the condition that the terminal moves at a high speed, information fed back by the terminal may be outdated, mismatch between transmission parameters and actual channel conditions is caused, and system performance is deteriorated. In order to deal with a high-speed mobile scene, an open-loop Multiple-Input Multiple-Output (MIMO) transmission scheme is introduced into LTE Rel-8. In the open-loop MIMO transmission scheme, the terminal does not feed back the PMI any more, but only needs to feed back channel Quality indication information (CQI for short) and Rank indication information (RI for short), and when calculating the CQI and the RI, the terminal assumes that a pre-agreed precoding matrix is used on resources related to data transmission.
The precoding matrix cycling scheme of the conventional open-loop MIMO transmission is suitable for the open-loop MIMO transmission using a Cell-specific Reference Signal (CRS) as a Demodulation pilot, and is not suitable for the open-loop MIMO scheme using a dedicated Demodulation Reference Signal (DMRS).
Disclosure of Invention
The embodiment of the invention provides a precoding method and a precoding device.
The precoding method provided by the embodiment of the invention comprises the following steps:
a base station determines a precoding matrix set used by a terminal;
the base station determines the corresponding relation between the precoding matrix in the precoding matrix set and the resource allocated to the terminal;
and the base station uses the precoding matrix in the precoding matrix set to precode data transmitted on the resources allocated to the terminal according to the corresponding relation.
Optionally, the set of precoding matrices used by the terminal is pre-agreed or specified by the terminal.
Optionally, the matrix in the precoding matrix set is divided into N subsets, where N is an integer greater than 1;
the base station determines the corresponding relation between the precoding matrix in the precoding matrix set and the resource allocated to the terminal, and the method comprises the following steps: the base station determines one of the subsets for one resource block allocated to the terminal; wherein one resource block corresponds to one subset, and one resource block comprises one or more REs;
the precoding, by using a precoding matrix in the precoding matrix set, data transmitted on a resource allocated to the terminal includes: and precoding the data transmitted on the corresponding resource block by using the precoding matrix in the subset.
Optionally, the correspondence includes a correspondence between subsets and resource blocks, and the N subsets correspond to resource blocks allocated to the terminal in a cyclic manner.
Optionally, when the base station determines a correspondence between a precoding matrix in the precoding matrix set and a resource allocated to the terminal, the method further includes: the base station determines a precoding matrix for one RE in a resource block in a subset corresponding to the resource block allocated to the terminal; wherein one RE corresponds to one precoding matrix;
the base station uses the precoding matrix in the subset to precode data transmitted on the corresponding resource block, and the precoding comprises the following steps: and the base station performs precoding on the data transmitted on the corresponding RE by using the determined precoding matrix.
Optionally, the correspondence includes a correspondence between precoding matrices and REs, and a precoding matrix cycle in one subset corresponds to a RE in one resource block.
Optionally, the precoding matrices in the same subset are formed by a same set of beamforming vectors.
The precoding device provided by the embodiment of the invention comprises:
a first determining module, configured to determine a precoding matrix set used by a terminal;
a second determining module, configured to determine a correspondence between precoding matrices in the precoding matrix set and resources allocated to the terminal;
and the precoding module is used for precoding data transmitted on the resources allocated to the terminal by using the precoding matrix in the precoding matrix set according to the corresponding relation.
Optionally, the set of precoding matrices used by the terminal is pre-agreed or specified by the terminal.
Optionally, the matrix in the precoding matrix set is divided into N subsets, where N is an integer greater than 1; the second determining module is specifically configured to: determining one of said subsets for a resource block allocated to said terminal; wherein one resource block corresponds to one subset, and one resource block comprises one or more REs;
the pre-coding module is specifically configured to: and precoding the data transmitted on the corresponding resource block by using the precoding matrix in the subset.
Optionally, the correspondence includes a correspondence between subsets and resource blocks, and the N subsets correspond to resource blocks allocated to the terminal in a cyclic manner.
Optionally, the second determining module is further configured to: determining a precoding matrix for an RE in a resource block in a subset corresponding to the resource block allocated to the terminal; wherein one RE corresponds to one precoding matrix;
the pre-coding module is specifically configured to: and precoding the data transmitted on the corresponding RE by using the determined precoding matrix.
Optionally, the correspondence includes a correspondence between precoding matrices and REs, and a precoding matrix cycle in one subset corresponds to a RE in one resource block.
Optionally, the precoding matrices in the same subset are formed by a same set of beamforming vectors.
The device for communication provided by the embodiment of the invention comprises: a transceiver, processing and memory;
the memory to store computer program instructions;
the processor, coupled to the memory, is configured to read the computer program instructions stored by the memory and perform the following steps:
determining a precoding matrix set used by a terminal;
determining a corresponding relation between a precoding matrix in the precoding matrix set and resources allocated to the terminal;
and precoding data transmitted on the resources allocated to the terminal by using the precoding matrix in the precoding matrix set according to the corresponding relation.
In the above embodiment of the present invention, after determining the precoding matrix set used by the terminal, the base station determines the correspondence between the precoding matrix in the precoding matrix set and the resource allocated to the terminal, and according to the correspondence, uses the precoding matrix in the precoding matrix set to precode the data of the terminal, thereby providing an open-loop MIMO transmission scheme suitable for DMRS demodulation.
The embodiment of the invention also provides a method and a device for determining the channel state information.
The method for determining the channel state information provided by the embodiment of the invention comprises the following steps:
the terminal determines a used precoding matrix set;
the terminal determines the corresponding relation between the precoding matrix in the precoding matrix set and the resource corresponding to the channel state information;
and the terminal determines the channel state information by using the precoding matrix in the precoding matrix set according to the corresponding relation.
Optionally, the set of precoding matrices used by the terminal is pre-agreed or specified by the base station.
Optionally, the matrix in the precoding matrix set is divided into N subsets, where N is an integer greater than 1;
the terminal determines the corresponding relationship between the precoding matrix in the precoding matrix set and the resource corresponding to the channel state information, and the method comprises the following steps: the terminal determines one subset for one resource block corresponding to the channel state information; wherein one resource block corresponds to one subset, and one resource block comprises one or more REs;
the determining channel state information by using the precoding matrix in the set of precoding matrices includes: and calculating the channel state information aiming at the corresponding resource block by using the precoding matrix in the subset.
Optionally, the correspondence includes a correspondence between subsets and resource blocks, and the N subsets cyclically correspond to resource blocks corresponding to the channel state information.
Optionally, when the terminal determines the correspondence between the precoding matrix in the precoding matrix set and the resource corresponding to the channel state information, the method further includes: the terminal determines a precoding matrix for an RE in a resource block in a subset corresponding to the resource block corresponding to the channel state information; wherein one RE corresponds to one precoding matrix;
the calculating the channel state information for the corresponding resource block by using the precoding matrix in the subset includes: and calculating the channel state information aiming at the corresponding RE by using the determined precoding matrix.
Optionally, the correspondence includes a correspondence between precoding matrices and REs, and a precoding matrix in one subset cyclically corresponds to a RE in one resource block.
Optionally, the precoding matrices in the same subset are formed by a same set of beamforming vectors.
The channel state information determining device provided by the embodiment of the invention comprises:
a first determining module, configured to determine a set of used precoding matrices;
a second determining module, configured to determine a correspondence between a precoding matrix in the precoding matrix set and a resource corresponding to channel state information;
and the channel state information determining module is used for determining the channel state information by using the precoding matrix in the precoding matrix set according to the corresponding relation.
Optionally, the set of precoding matrices used by the terminal is pre-agreed or specified by the base station.
Optionally, the matrix in the precoding matrix set is divided into N subsets, where N is an integer greater than 1;
the second determining module is specifically configured to: determining one of the subsets for a resource block corresponding to the channel state information; wherein one resource block corresponds to one subset, and one resource block comprises one or more REs;
the channel state information determining module is specifically configured to: and calculating the channel state information aiming at the corresponding resource block by using the precoding matrix in the subset.
Optionally, the correspondence includes a correspondence between subsets and resource blocks, and the N subsets cyclically correspond to resource blocks corresponding to the channel state information.
Optionally, the second determining module is further configured to: determining a precoding matrix for an RE in a resource block in a subset corresponding to the resource block corresponding to the channel state information; wherein one RE corresponds to one precoding matrix;
the channel state information determining module is specifically configured to: and calculating the channel state information aiming at the corresponding RE by using the determined precoding matrix.
Optionally, the precoding matrices in the same subset are formed by a same set of beamforming vectors.
The device for communication provided by the embodiment of the invention comprises: a transceiver, a processor, and a memory;
the memory to store computer program instructions;
the processor, coupled to the memory, is configured to read the computer program instructions stored by the memory and perform the following steps:
determining a set of used precoding matrices;
determining a corresponding relation between a precoding matrix in the precoding matrix set and resources corresponding to channel state information;
and determining channel state information by using the precoding matrix in the precoding matrix set according to the corresponding relation.
In the above embodiment of the present invention, after determining the used precoding matrix set, the terminal determines the correspondence between the precoding matrix in the precoding matrix set and the resource corresponding to the channel state information, and determines the channel state information by using the precoding matrix in the precoding matrix set according to the correspondence, thereby providing an open-loop MIMO transmission scheme suitable for DMRS demodulation.
Drawings
Fig. 1 is a schematic structural diagram of a MIMO system using a single user as an example in the prior art;
fig. 2 is a schematic diagram of a transmission structure of a codebook-based precoding technique in the prior art;
fig. 3 is a schematic diagram of a precoding process provided in an embodiment of the present invention;
fig. 4 is a schematic diagram of a channel state information determination process provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a precoding apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an apparatus for communication according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a channel state information determining apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an apparatus for communication according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The LTE network adopts the MIMO technology to increase the system capacity and improve the throughput rate. Fig. 1 shows a block diagram of a MIMO system with a single user as an example, where a transmitting end (e.g., a base station) and a receiving end (e.g., a terminal) both have multiple antennas. At the transmitting end, the input serial code stream is converted into several parallel independent sub-code streams through a series of pre-treatments (such as modulation, coding, weighting and mapping), and is transmitted out through different transmitting antennas. At the receiving end, the antenna group with no less than the number of the transmitting antennas is used for receiving, and the multi-channel receiving signals are processed in the space domain and the time domain by using a certain coding relation between the estimated channel transmission characteristic and the transmitting sub-code stream, so that a plurality of transmitting sub-code streams are separated and then converted into serial data for outputting.
However, due to the correlation of the channels in the channel matrix, the increase of the capacity causes the interference to be correspondingly increased, and in order to reduce the complexity of the terminal for eliminating the influence between the channels, reduce the system overhead, and maximally improve the system capacity of MIMO, a precoding technology is introduced in the prior art.
Fig. 2 shows a wireless network structure adopting a codebook-based precoding technique, which includes a base station 201, a terminal 202 and a wireless link 203. Terminal 202 and base station 201 each have multiple antennas. Terminal 202 and base station 201 are configured with the same set of precoding matrices (codebooks). After measuring the downlink channel and determining the precoding matrix, the terminal 202 feeds back CSI, which includes one or more of CQI indicating the quality of the wireless communication channel between the base station and the terminal, PMI indicating a preferred precoding matrix for shaping the transmission signal, RI indicating the number of useful transmission layers of the data channel preferred by the terminal, and estimation of channel coefficients, to the base station 201 through the wireless link 203. The fed back CSI enables the base station 201 to adaptively configure a suitable transmission scheme to improve coverage, or user data transmission rate, or more accurately predict channel quality for future transmissions to the terminal 202.
The embodiment of the invention provides a precoding method and a precoding device for open-loop MIMO transmission suitable for DMRS demodulation. In the embodiment of the invention, the base station can cyclically use the precoding matrix in the precoding matrix set to precode the data of the terminal. The cyclic use of the precoding matrix in the precoding matrix set means that, when the base station transmits data to the terminal, the base station uses the matrix in the precoding matrix set alternately in the time-frequency resource allocated to the terminal according to a certain rule.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 3, a schematic diagram of a precoding process provided in the embodiment of the present invention, the process may include the following steps:
step 301: the base station determines a set of precoding matrices used by the terminal.
The set of precoding matrices may be predetermined or determined by the terminal. Determining the set of precoding matrices by the terminal means: and the base station determines a precoding matrix set used by the terminal according to the information fed back by the terminal. More specifically, the base station may determine a precoding matrix set used by the terminal according to the first PMI and the second PMI fed back by the terminal.
Step 302: and the base station determines the corresponding relation between the precoding matrix in the precoding matrix set and the resource allocated to the terminal.
Optionally, the corresponding relationship may enable different resources to correspond to different precoding matrices as much as possible, for example, a precoding matrix cycle in the precoding matrix set corresponds to different resources allocated to the terminal, so that the base station may cyclically use the precoding matrix in the precoding matrix set to precode the resources allocated to the terminal.
Step 303: and the base station uses the precoding matrix in the precoding matrix set to precode the data of the terminal according to the corresponding relation.
Optionally, the precoding matrix in the set of precoding matrices may be divided into N subsets, where N is an integer greater than 1. In specific implementation, the subset division may be performed according to the characteristics of the precoding matrix. For example, the precoding matrix in the same subset is formed by a same group of beamforming vectors, and a group of beamforming vectors forming the precoding matrix in different subsets may be different or the same. Let the number of matrices in the first subset be M1The number of the matrixes in the second subset is M2And so on.
The Resource allocated to the terminal by the base station is in units of Physical Resource Blocks (PRBs), and each Resource Block includes a plurality of Resource Elements (REs). Accordingly, the cycle of the precoding matrix may be decomposed into a physical resource block level or further into an RE level.
In the example of cycling at the PRB level, the base station may cycle through subsets of a set of precoding matrices on the PRBs allocated to the terminal to precode data transmitted on different PRBs, where one PRB corresponds to one subset. The base station may select in the order of PRB numbers. For example, a PRB numbered 1 uses the (1mod N) +1 subset, and a PRB numbered m uses the (m mod N) +1 subset. That is, assuming that the PRBs are numbered in a certain order, for example, in a frequency order from low to high, the correspondence between the PRBs and the subsets follows the following rule:
n＝(m mod N)+1，0<n<＝N；
alternatively, the law may also be expressed as N ═ m mod N, 0< ═ N < N.
Where n denotes the number of the subset, and m denotes the number of the PRB allocated to the terminal. The number of the PRB may be a global number within a system bandwidth, a number within one subband, or a number of a PRB allocated to the terminal.
In the example of performing the cycling at the RE level, the base station determines a precoding matrix for one RE in one resource block allocated to the terminal in the subset corresponding to the resource block, so that the base station performs precoding on data transmitted on different REs in each PRB allocated to the terminal by cyclically using the precoding matrix in the subset corresponding to the PRB, wherein one RE corresponds to one precoding matrix. The base station may use the matrices in the subset in turn according to a certain rule. For example, the loop may be performed in a manner of Frequency domain first and time domain later, that is, the 1 st subcarrier of the l-th Orthogonal Frequency Division Multiplexing (OFDM) symbol uses the 1 st precoding matrix in the subset, and the k-th subcarrier uses the (k mod Mn) +1 precoding matrix in the subset, that is, the correspondence between the REs on one symbol and the precoding matrices conforms to the following rule:
q＝(k mod Mn)+1，0<n<＝N
alternatively, the law may also be expressed as q ═ k mod Mn)，0<＝n<N。
Where n denotes the number of the subset corresponding to the PRB in which the frequency domain of the RE is located, and M denotes the number of the subset corresponding to the PRB in which the frequency domain of the RE is locatednDenotes the number of precoding matrices in the subset numbered n, q denotes the number of precoding matrices in the subset numbered n, and k denotes the number of REs.
Alternatively, the base station may also select the precoding matrix according to the number of the data mapped to the RE, wherein each data of one transmission may be identified with a unique number. For example, if the number of data mapped to an RE is i, the (i mod Mn) +1 st precoding matrix can be selected for the RE. That is, the correspondence between REs and precoding matrices complies with the following rule:
p＝(i mod Mn)+1，0<n<＝N
alternatively, the law can also be expressed as: p ═ i mod Mn)，0<＝n<N。
Where n denotes the number of the subset corresponding to the PRB in which the frequency domain of the RE is located, and M denotes the number of the subset corresponding to the PRB in which the frequency domain of the RE is locatednDenotes the number of precoding matrices in the subset numbered n, p denotes the number of precoding matrices in the subset numbered n, and i denotes the number of data mapped to the RE.
In the above example, the PRB may be replaced by physical resources of other granularity sizes, which are collectively referred to as resource blocks herein. Different resource blocks may be different time-frequency resources, different frequency-domain resources, or different time-frequency resource combinations. Specifically, one resource block may be an RE, a subcarrier, a PRB, or a PRB set, and may also be an RE, a subcarrier, a PRB, or a PRB set for transmitting data symbols.
The embodiment of the invention also provides a method for determining the channel state information by using the precoding matrix by the terminal.
Referring to fig. 4, a schematic diagram of a channel state information determination process provided in the embodiment of the present invention is shown, where the process may include the following steps:
step 401: the terminal determines the set of precoding matrices to use.
The set of precoding matrices used by the terminal is predetermined or specified by the base station.
Step 402: and the terminal determines the corresponding relation between the precoding matrix in the precoding matrix set and the resource corresponding to the channel state information.
Optionally, the correspondence may enable different resources to correspond to different precoding matrices as far as possible, for example, precoding matrix cycles in the precoding matrix set correspond to different resources, so that the terminal may cyclically use the precoding matrices in the precoding matrix set to perform channel state information calculation.
Step 403: and the terminal determines the channel state information by using the precoding matrix in the precoding matrix set according to the corresponding relation. The channel state information may be CQI, RI, etc.
In the embodiment of the present invention, the precoding matrix in the precoding matrix set may be divided into N subsets, where N is an integer greater than 1, and the specific division manner may be as described above.
The resource allocated to the terminal by the base station is in PRB unit, and each resource block comprises a plurality of REs. Accordingly, the cycle of the precoding matrix may be decomposed into PRB level or further into RE level.
In the example of cycling at the PRB level, the terminal may calculate the channel state information under the condition of cycling the subset on the PRBs corresponding to the channel state information, where one PRB corresponds to one subset. The terminal may select the PRBs in the order of their numbers, and the correspondence between the PRBs and the subsets may be as described in the foregoing embodiments.
In the example of performing the cycling on the RE level, the terminal determines a precoding matrix for one RE in one resource block corresponding to the channel state information in the subset corresponding to the resource block, so that the terminal calculates the channel state information under the condition that the terminal performs precoding by cyclically using the precoding matrix in the subset corresponding to the resource block in each resource block corresponding to the channel state information, wherein one RE corresponds to one precoding matrix. The terminal may use the matrices in the subset in turn according to a certain rule, and the correspondence between the REs and the precoding matrices may be as described in the foregoing embodiments.
In the above example, the PRB may be replaced by physical resources of other granularity sizes, which are collectively referred to as resource blocks herein. Different resource blocks may be different time-frequency resources, different frequency-domain resources, or different time-frequency resource combinations. Specifically, one resource block may be an RE, a subcarrier, a PRB, or a PRB set, and may also be an RE, a subcarrier, a PRB, or a PRB set for transmitting data symbols.
In the above embodiments of the present invention, after determining the used precoding matrix set, the terminal cyclically uses the precoding matrix in the precoding matrix set to determine the channel state information, thereby providing an open-loop MIMO transmission scheme suitable for DMRS demodulation.
The set of precoding matrices may also be referred to as a first codebook. The first codebook may be derived based on one vector of a set of vectors. The vector for obtaining the first codebook may be a vector agreed in advance by the terminal and the base station. Such as by specifying a vector in the protocol or a first codebook derived from specifying a vector. The vectors in the vector group may be Discrete Fourier Transform (DFT) vectors or antenna array response vectors. For example, one vector of the set of vectors is denoted vm＝[1 ej2πm/32 ej4πm/32 ej6πm/32]T. Wherein different m correspond to different vectors. The vector group comprises one or more vectors, and each vector is used for obtaining a subset in a first codebook. If multiple vectors are included in the vector set, different vectors may be used to derive different subsets.
In specific implementation, the precoding matrix in each subset in the first codebook may be obtained according to the vector in the appointed vector group and the phase factor in the phase set.
The phase set comprises one or more phase factors, and a precoding matrix in the first codebook is obtained based on one phase factor. If it is notThe phase set includes a plurality of phase factors, and then one vector in the vector group and different phase factors in the phase set can obtain different precoding matrices in the first codebook corresponding to the vector. In the examples of the present invention, use
A set of phases is represented, and,
representing a phase factor of 0 in the set of phases<＝n<N, N is the number of phase factors in the phase set. The phases are collected into
Or
Wherein n is an integer of 0<＝n<N, N is the number of phase factors in the phase set. For example, N-0, 1, N-2,
or N is 0,1,2,3, N is 4,
and the like.
The following describes a configuration of the first codebook, taking an 8-antenna system as an example. The precoding matrix for an 8-antenna system can be represented as:
W＝W1W2
wherein, W1Representing long-term, broadband information, W2Representing short-time, sub-band information. In particular, W1Can be expressed as:
where X is a 4-row Nb column matrix, consisting of Discrete Fourier Transform (DFT) vectors. Nb represents the number of columns of the matrix X and may be, for example, 4.
W2It can be expressed as (here, rank 1 or rank 2 is taken as an example, and the method of other ranks is the same, and rank represents the number of transmission layers):
Wherein the content of the first and second substances,
is a column selection vector of which m isnEach element is 1, and the other elements are 0, and the beamforming vectors in X are selected; alpha is alphanIs a modulo-1 phase combining factor for performing phase combining between the two polarization directions. The distinction between precoding matrices may thus include: formed by different beamforming vectors or by different phase combining factors.
The precoding matrix may be identified by a first precoding matrix identifier (denoted as first PMI) and a second precoding matrix identifier (denoted as second PMI), the first PMI corresponding to W1The second PMI corresponds to W2. A set of precoding matrices may be determined based on a first PMI fed back by a terminal, the precoding matrices in the set being W indicated by the first PMI1And all possible W2And determining after multiplication. Here, a set of precoding matrices corresponding to the first PMI is defined as a first codebook. The precoding matrices formed by the same beamforming vectors in the first codebook form a subset, and the phase combining factors of the precoding matrices in the subset are different.
Table 1 is an example of a rank-1 first codebook. i.e. i1Denotes a first PMI, i2Representing a second PMI. The first codebook may be composed of a first PMI (i in Table 1)1) To indicate i1For indicating a first codebook. Wherein i1Is an index of the first codebook, i2Is i1Indicated in the first codebookIndex of precoding matrix.
Each i1The precoding matrix set (i.e. the first codebook) corresponding to the value of (a) includes 16 matrices, and the 16 matrices can be divided into 4 subsets:
subset 1: i.e. i2＝0,i2＝1,i2＝2,i2＝3；
Subset 2: i.e. i2＝4,i2＝5,i2＝6,i2＝7；
Subset 3: i.e. i2＝8,i2＝9,i2＝10,i2＝11；
Subset 4: i.e. i2＝12,i2＝13,i2＝14,i2＝15；
Table 1: i.e. i1First codebook (rank 1) under different values
In Table 1, i1The first codebook is identified to include 16 matrices, each with i2Each matrix is identified. Each precoding matrix may be represented by a vector vm＝[1 ej2πm/32 ej4πm/32 ej6πm/32]TAnd phase factor phin＝ejπn(n is 0,1,2, 3). That is, one precoding matrix can be expressed as:
table 2 shows an example of the first codebook when rank is 2. i.e. i1Denotes a first PMI, i2Representing a second PMI. The first codebook may be composed of a first PMI (i in Table 1)1) To indicate i1For indicating a first codebook. Wherein i1Is an index of the first codebook, i2Is i1An index of the indicated precoding matrix in the first codebook.
Each i1Is corresponding to the value ofThe set of coding matrices (i.e. the first codebook) includes 8 matrices, and the 16 matrices can be divided into 4 subsets:
subset 1: i.e. i2＝0,i2＝1；
Subset 2: i.e. i2＝2,i2＝3；
Subset 3: i.e. i2＝4,i2＝5；
Subset 4: i.e. i2＝6,i2＝7；
Table 2: i.e. i1First codebook (rank 2) under different values
In Table 2, i1The first codebook is identified to include 8 matrices, each with i2Each matrix is identified. Each precoding matrix may be represented by a vector vm＝[1 ej2πm/32 ej4πm/32 ej6πm/32]TAnd phase factor phin＝ejπn(n is 0, 1). That is, one precoding matrix can be expressed as:
for 4 antennas, 12 antennas, 16 antennas, and other numbers of antennas, the codebook can be implemented as in the above example as long as it employs the same dipole codebook structure as the 8 antennas.
Based on the same technical concept, the embodiment of the invention also provides a precoding device.
Referring to fig. 5, a schematic structural diagram of a precoding apparatus provided in the embodiment of the present invention is shown, where the precoding apparatus can implement the precoding process provided in the foregoing embodiment, and the precoding apparatus may be a base station or integrated in the base station. As shown, the apparatus may comprise: a first determining module 501, a second determining module 502, and a pre-coding module 503, wherein:
a first determining module 501, configured to determine a precoding matrix set used by a terminal;
a second determining module 502, configured to determine a corresponding relationship between a precoding matrix in the set of precoding matrices and a resource allocated to the terminal;
a precoding module 503, configured to precode data of the terminal by using a precoding matrix in the precoding matrix set according to the correspondence.
Optionally, the set of precoding matrices used by the terminal is pre-agreed or specified by the terminal.
Optionally, the matrix in the precoding matrix set is divided into N subsets, where N is an integer greater than 1; the second determining module 502 may be specifically configured to: determining one of the subsets for one resource block allocated to the terminal, wherein one resource block corresponds to one subset and one resource block comprises one or more REs; the pre-coding module 503 is specifically configured to: and precoding the data transmitted on the corresponding resource block by using the precoding matrix in the subset.
Optionally, the correspondence includes a correspondence between subsets and resource blocks, and the N subsets correspond to resource blocks allocated to the terminal in a cyclic manner.
Optionally, the second precoding matrix 502 may also be used to: determining a precoding matrix for an RE in a resource block in a subset corresponding to the resource block allocated to the terminal; wherein one RE corresponds to one precoding matrix; the pre-coding module 503 is specifically configured to: and precoding the data transmitted on the corresponding RE by using the determined precoding matrix.
Optionally, the correspondence includes a correspondence between precoding matrices and REs, and a precoding matrix cycle in one subset corresponds to a RE in one resource block.
Optionally, the precoding matrices in the same subset are formed by a same set of beamforming vectors.
Based on the same technical concept, the embodiment of the present invention further provides a device for communication, which can implement the precoding flow diagram described in the foregoing embodiment.
As shown in fig. 6, the apparatus may include: a processor 601, a memory 602, a transceiver 603, and a bus 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 in performing operations. The transceiver 603 is used for receiving and transmitting data under the control of the processor 601.
The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 601, and various circuits of memory, represented by memory 602, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface 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 in performing operations.
The process disclosed by the embodiment of the invention can be applied to the processor 601 or implemented by the processor 601. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 601. 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, discrete gate or transistor logic, discrete hardware components, or the like that implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. 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 the hardware thereof.
Specifically, the processor 601, configured to read the program in the memory 602, executes the following processes: determining a precoding matrix set used by a terminal, determining a corresponding relation between precoding matrixes in the precoding matrix set and resources allocated to the terminal, and precoding data of the terminal by using the precoding matrixes in the precoding matrix set according to the corresponding relation.
Based on the same technical concept, the embodiment of the invention also provides a channel state information determining code device.
Referring to fig. 7, a schematic structural diagram of a device for determining channel state information according to an embodiment of the present invention is provided, where the device can implement the channel state information determination procedure provided in the foregoing embodiment, and the device may be a terminal or integrated in a terminal. As shown, the apparatus may comprise: a first determining module 701, a second determining module 702, and a channel state information determining module 703, wherein:
a first determining module 701, configured to determine a set of used precoding matrices;
a second determining module 702, configured to determine a correspondence between a precoding matrix in the set of precoding matrices and a resource corresponding to channel state information;
a channel state information determining module 703, configured to cyclically use the precoding matrix in the set of precoding matrices to determine channel state information.
Optionally, the set of precoding matrices used by the terminal is pre-agreed or specified by the base station.
Optionally, the second determining module 702 is specifically configured to: determining one of the subsets for a resource block corresponding to the channel state information; wherein one resource block corresponds to one subset, and one resource block comprises one or more REs; the channel state information determining module 703 is specifically configured to: and calculating the channel state information aiming at the corresponding resource block by using the precoding matrix in the subset.
Optionally, the correspondence includes a correspondence between subsets and resource blocks, and the N subsets cyclically correspond to resource blocks corresponding to the channel state information.
Optionally, the second determining module 702 is further configured to: determining a precoding matrix for an RE in a resource block in a subset corresponding to the resource block corresponding to the channel state information; wherein one RE corresponds to one precoding matrix; the channel state information determining module 703 is specifically configured to: and calculating the channel state information aiming at the corresponding RE by using the determined precoding matrix.
Optionally, the precoding matrices in the same subset are formed by a same set of beamforming vectors.
Based on the same technical concept, the embodiment of the present invention further provides a device for communication, which can implement the precoding flow diagram described in the foregoing embodiment.
As shown in fig. 8, the apparatus may include: a processor 801, a memory 802, a transceiver 803, and a bus interface. The processor 801 is responsible for managing the bus architecture and general processing, and the memory 802 may store data used by the processor 801 in performing operations. The transceiver 803 is used for receiving and transmitting data under the control of the processor 801.
The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 801, and various circuits, represented by the memory 802, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 801 is responsible for managing the bus architecture and general processing, and the memory 802 may store data used by the processor 801 in performing operations.
The processes disclosed in the embodiments of the present invention can be applied to the processor 801 or implemented by the processor 801. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 801. The processor 801 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, discrete gate or transistor logic, discrete hardware components, or the like that implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 802, and the processor 801 reads the information in the memory 802, and completes the steps of the signal processing flow in combination with the hardware thereof.
Specifically, the processor 801, which is configured to read the program in the memory 802, executes the following processes: determining a set of used precoding matrices; determining a corresponding relation between a precoding matrix in the precoding matrix set and resources corresponding to channel state information; and determining the channel state information by using the precoding matrix in the precoding matrix set according to the corresponding relation.
The specific implementation process of the precoding procedure described above can be referred to the foregoing embodiments, and is not described in detail here.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (21)
1. A precoding method, comprising:
a base station determines a precoding matrix set used by a terminal, wherein a matrix in the precoding matrix set is divided into N subsets, N is an integer greater than 1, and precoding matrices in the same subset are formed by a group of same beamforming vectors;
the base station determines the corresponding relation between the precoding matrix in the precoding matrix set and the resource allocated to the terminal, wherein the base station determines one subset for one resource block allocated to the terminal; wherein one resource block corresponds to one subset, and one resource block comprises one or more Resource Elements (REs);
and the base station uses the precoding matrix in the subset to precode data transmitted on the corresponding resource block allocated to the terminal according to the corresponding relation.
2. The method of claim 1, wherein the set of precoding matrices used by the terminal is pre-agreed or specified by the terminal.
3. The method of claim 1, wherein the correspondence comprises correspondence between subsets and resource blocks, and wherein the N subsets correspond cyclically to resource blocks allocated to the terminal.
4. The method of claim 1, wherein when the base station determines the correspondence between the precoding matrices in the set of precoding matrices and the resources allocated to the terminal, the method further comprises:
the base station determines a precoding matrix for one RE in a resource block in a subset corresponding to the resource block allocated to the terminal; wherein one RE corresponds to one precoding matrix;
the base station uses the precoding matrix in the subset to precode data transmitted on the corresponding resource block, and the precoding comprises the following steps:
and the base station performs precoding on the data transmitted on the corresponding RE by using the determined precoding matrix.
5. The method of claim 4, wherein the correspondence comprises a correspondence between precoding matrices and REs, and wherein a precoding matrix cycle in a subset corresponds to an RE in a resource block.
6. A method for determining channel state information, comprising:
a terminal determines a used precoding matrix set, wherein a matrix in the precoding matrix set is divided into N subsets, N is an integer larger than 1, and precoding matrices in the same subset are formed by a group of same beam forming vectors;
the terminal determines the corresponding relation between the precoding matrix in the precoding matrix set and the resource corresponding to the channel state information, wherein the terminal determines one subset for one resource block corresponding to the channel state information; wherein one resource block corresponds to one subset, and one resource block comprises one or more Resource Elements (REs);
and the terminal determines channel state information aiming at the corresponding resource block by using the pre-coding matrix in the subset according to the corresponding relation.
7. The method of claim 6, wherein the set of precoding matrices used by the terminal is pre-agreed or specified by a base station.
8. The method of claim 6, wherein the correspondence relationship comprises a correspondence relationship between subsets and resource blocks, and the N subsets correspond to resource blocks corresponding to the channel state information in a cyclic manner.
9. The method of claim 6, wherein when the terminal determines the correspondence between the precoding matrix in the set of precoding matrices and the resource corresponding to the channel state information, the method further comprises:
the terminal determines a precoding matrix for an RE in a resource block in a subset corresponding to the resource block corresponding to the channel state information; wherein one RE corresponds to one precoding matrix;
the calculating the channel state information for the corresponding resource block by using the precoding matrix in the subset includes:
and calculating the channel state information aiming at the corresponding RE by using the determined precoding matrix.
10. The method of claim 9, wherein the correspondence comprises a correspondence between precoding matrices and REs, and wherein precoding matrices in a subset correspond cyclically to REs in a resource block.
11. A precoding apparatus, comprising:
the terminal comprises a first determining module, a second determining module and a third determining module, wherein the first determining module is used for determining a precoding matrix set used by the terminal, the matrix in the precoding matrix set is divided into N subsets, N is an integer larger than 1, and the precoding matrix in the same subset consists of a group of same beam forming vectors;
a second determining module, configured to determine a correspondence between precoding matrices in the precoding matrix set and resources allocated to the terminal, where one subset is determined for one resource block allocated to the terminal; wherein one resource block corresponds to one subset, and one resource block comprises one or more Resource Elements (REs);
and the precoding module is used for precoding data transmitted on the corresponding resource block allocated to the terminal by using the precoding matrix in the subset according to the corresponding relation.
12. The apparatus of claim 11, wherein the set of precoding matrices used by the terminal is pre-agreed or specified by the terminal.
13. The apparatus of claim 11, wherein the correspondence comprises correspondence between subsets and resource blocks, and wherein the N subsets correspond cyclically to resource blocks allocated to the terminal.
14. The apparatus of claim 11, wherein the second determining module is further for: determining a precoding matrix for an RE in a resource block in a subset corresponding to the resource block allocated to the terminal; wherein one RE corresponds to one precoding matrix;
the pre-coding module is specifically configured to: and precoding the data transmitted on the corresponding RE by using the determined precoding matrix.
15. The apparatus of claim 14, wherein the correspondence comprises a correspondence between precoding matrices and REs, and wherein a precoding matrix cycle in a subset corresponds to a RE in a resource block.
16. A channel state information determining apparatus, comprising:
a first determining module, configured to determine a used precoding matrix set, where a matrix in the precoding matrix set is divided into N subsets, where N is an integer greater than 1, and precoding matrices in the same subset are formed by a group of same beamforming vectors;
a second determining module, configured to determine a correspondence between a precoding matrix in the precoding matrix set and a resource corresponding to channel state information, where one of the subsets is determined for one resource block corresponding to the channel state information; wherein one resource block corresponds to one subset, and one resource block comprises one or more Resource Elements (REs);
and the channel state information determining module is used for determining the channel state information aiming at the corresponding resource block by using the precoding matrix in the subset according to the corresponding relation.
17. The apparatus of claim 16, wherein the set of precoding matrices used by the terminal is pre-agreed or specified by the base station.
18. The apparatus of claim 16, wherein the correspondence relationship comprises a correspondence relationship between subsets and resource blocks, and the N subsets correspond to resource blocks corresponding to the channel state information in a cyclic manner.
19. The apparatus of claim 16, wherein the second determining module is further for: determining a precoding matrix for an RE in a resource block in a subset corresponding to the resource block corresponding to the channel state information; wherein one RE corresponds to one precoding matrix;
the channel state information determining module is specifically configured to: and calculating the channel state information aiming at the corresponding RE by using the determined precoding matrix.
20. An apparatus for communication, comprising: a transceiver, a processor, and a memory;
the memory to store computer program instructions;
the processor, coupled to the memory, is configured to read the computer program instructions stored by the memory and perform the following steps:
determining a precoding matrix set used by a terminal, wherein a matrix in the precoding matrix set is divided into N subsets, N is an integer greater than 1, and precoding matrices in the same subset are formed by a group of same beamforming vectors;
determining a corresponding relation between precoding matrixes in the precoding matrix set and resources allocated to the terminal, wherein one subset is determined for one resource block allocated to the terminal; wherein one resource block corresponds to one subset, and one resource block comprises one or more Resource Elements (REs);
and precoding data transmitted on the corresponding resource block allocated to the terminal by using the precoding matrix in the subset according to the corresponding relation.
21. An apparatus for communication, comprising: a transceiver, a processor, and a memory;
the memory to store computer program instructions;
the processor, coupled to the memory, is configured to read the computer program instructions stored by the memory and perform the following steps:
determining a used precoding matrix set, wherein the matrix in the precoding matrix set is divided into N subsets, N is an integer greater than 1, and the precoding matrix in the same subset consists of a group of same beamforming vectors;
determining a corresponding relation between a precoding matrix in the precoding matrix set and a resource corresponding to channel state information, wherein one subset is determined for one resource block corresponding to the channel state information; wherein one resource block corresponds to one subset, and one resource block comprises one or more Resource Elements (REs);
and determining channel state information for the corresponding resource block by using the precoding matrix in the subset according to the corresponding relation.
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