CN106033990B - A kind of channel state information feedback method, acquisition methods and device - Google Patents

A kind of channel state information feedback method, acquisition methods and device Download PDF

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CN106033990B
CN106033990B CN201510112750.2A CN201510112750A CN106033990B CN 106033990 B CN106033990 B CN 106033990B CN 201510112750 A CN201510112750 A CN 201510112750A CN 106033990 B CN106033990 B CN 106033990B
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terminal
coding matrix
channel
transformation
network equipment
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CN106033990A (en
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高秋彬
陈文洪
李辉
陈润华
拉盖施
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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Abstract

The embodiment of the invention discloses a kind of channel state information feedback method, acquisition methods and devices.In this method, terminal obtains transformation pre-coding matrix relevant to the downlink channel condition of the terminal；The down channel estimated value that the terminal is obtained according to the transformation pre-coding matrix and measurement, obtains equivalent descending channel information；Wherein, the channel estimation value of at least one set of antenna port is transformed to the equivalent descending channel information of 1 equivalent aerial port by the transformation pre-coding matrix；The terminal carries out information feedback according to the equivalent descending channel information of the acquisition.Using the feedback and acquisition of the achievable channel state information of the present invention.

Description

A kind of channel state information feedback method, acquisition methods and device
Technical field
The present invention relates to wireless communication field more particularly to a kind of channel state information feedback methods, acquisition methods and dress It sets.
Background technique
LTE Rel-8 (Long Term Evolution Release-8, long term evolution version 8) system introduces closed loop Precoding technique is to improve spectrum efficiency.Closed loop precoding technical requirements all save the same precoding square in base station and terminal side The set of battle array, referred to as code book.After terminal estimates channel information according to cell common pilots, selected from code book by certain criterion One pre-coding matrix.The criterion of selection, which can be, to be maximized mutual information, maximizes output Signal to Interference plus Noise Ratio etc..Terminal will be selected Pre-coding matrix index in the codebook fed back by up channel to base station, which is denoted as PMI (Precoding Matrix Indicator, pre-coding matrix instruction).Base station determines the precoding square used the terminal according to the PMI received Battle array.The pre-coding matrix that terminal reports can be regarded as the quantized value of channel state information.
In existing cellular system, base-station antenna array is generally in horizontally arranged, as depicted in figs. 1 and 2.Transmission end of base station Wave beam is only capable of being adjusted in the horizontal direction, and vertical direction is fixed angle of declination, therefore various wave beam formings and precoding Technology etc. is based on the progress of horizontal direction channel information.Since wireless signal is three-dimensional propagation, fixed angle of declination in space Method the performance of system cannot be made to be optimal.The wave beam adjustment of vertical direction improves system for reducing inter-cell interference Performance has critically important meaning.
With the development of antenna technology, industry occurred can to the active antenna of each a period of time independent control, such as Fig. 3 and Shown in Fig. 4.Using this aerial array, such that wave beam is adjusted in the dynamic of vertical direction.Realize three-dimensional wave Beam figuration and precoding technique need the channel state information reported by terminal.But it is directed to this antenna array at present Column there has been no ideal information feedback and obtain scheme.
Summary of the invention
The embodiment of the invention provides a kind of channel state information feedback method, acquisition methods and devices, to realize letter The feedback and acquisition of channel state information.
Channel state information feedback method provided in an embodiment of the present invention, this method comprises:
Terminal obtains transformation pre-coding matrix relevant to the downlink channel condition of the terminal；
The down channel estimated value that the terminal is obtained according to the transformation pre-coding matrix and measurement, under acquisition is equivalent Row channel information；Wherein, the transformation pre-coding matrix by the channel estimation value of at least one set of antenna port be transformed to 1 it is equivalent The equivalent descending channel information of antenna port；
The terminal carries out information feedback according to the equivalent descending channel information of the acquisition.
Channel state information acquisition method provided in an embodiment of the present invention, comprising:
The network equipment sends the reference signal for carrying out channel state information measurement；
The first channel state information that the network equipment reception terminal is fed back according to the reference signal, described first Channel state information is the terminal according to transformation pre-coding matrix relevant to the downlink channel condition of the terminal and root It is obtained according to the down channel estimated value that the reference signal measurement obtains；Wherein, the transformation pre-coding matrix is by the net The channel estimation value of at least one set of antenna port of network equipment is transformed to the equivalent descending channel information of 1 equivalent aerial port；
Become used in the first channel state information that the network equipment is fed back according to the terminal and the terminal Pre-coding matrix is changed, determination carries out data transmission used pre-coding matrix to the terminal.
Terminal provided in an embodiment of the present invention, comprising:
First obtains module, for obtaining transformation pre-coding matrix relevant to the downlink channel condition of the terminal；
Second obtains module, the down channel estimated value for being obtained according to the transformation pre-coding matrix and measurement, Obtain equivalent descending channel information；Wherein, the transformation pre-coding matrix becomes the channel estimation value of at least one set of antenna port It is changed to the equivalent descending channel information of 1 equivalent aerial port；
Feedback module, for carrying out information feedback according to the equivalent descending channel information of the acquisition.
The network equipment provided in an embodiment of the present invention, comprising:
Sending module, for sending the reference signal for carrying out channel state information measurement；
Receiving module, the first channel state information fed back for receiving terminal according to the reference signal, described One channel state information be the terminal according to transformation pre-coding matrix relevant to the downlink channel condition of the terminal and It is obtained according to the down channel estimated value that the reference signal measurement obtains；Wherein, the transformation pre-coding matrix will be described The channel estimation value of at least one set of antenna port of the network equipment is transformed to the equivalent down channel letter of 1 equivalent aerial port Breath；
Determining module becomes used in the first channel state information and the terminal for being fed back according to the terminal Pre-coding matrix is changed, determination carries out data transmission used pre-coding matrix to the terminal.
In the above embodiment of the present invention, terminal is according to transformation precoding square relevant to the downlink channel condition of the terminal Battle array, and the down channel estimated value that measurement obtains, obtain equivalent descending channel information, and according to the equivalent downlink of the acquisition Channel information carries out information feedback, realizes the purpose of information feedback.On the other hand, pre- due to converting Encoder matrix is relevant to the downlink channel condition of terminal, but independent with interference and noise, therefore is prelisted based on the transformation Signal-to-noise ratio of the code matrix to the down channel that can improve the terminal after the down channel estimated value transformation of the terminal.
Detailed description of the invention
Fig. 1 is dual polarized antenna schematic diagram horizontally arranged in the prior art；
Fig. 2 is linear array antenna schematic diagram horizontally arranged in the prior art；
Fig. 3 is the dual polarized antenna schematic diagram of horizontal and vertical two-dimensional arrangements in the prior art；
Fig. 4 is the linear array antenna schematic diagram of horizontal and vertical two-dimensional arrangements in the prior art；
Fig. 5 is information feedback flow diagram provided in an embodiment of the present invention；
Fig. 6 to Fig. 9 is respectively the antenna port grouping schematic diagram in the embodiment of the present invention；
Figure 10 is that channel state information provided in an embodiment of the present invention obtains flow diagram；
Figure 11 is the structural schematic diagram of terminal provided in an embodiment of the present invention；
Figure 12 is the structural schematic diagram of the network equipment provided in an embodiment of the present invention；
Figure 13 be another embodiment of the present invention provides terminal structural schematic diagram；
Figure 14 be another embodiment of the present invention provides the network equipment structural schematic diagram.
Specific embodiment
As stated in the background art, due to three-dimensional wave beam forming and precoding technique, the letter reported by terminal is needed Channel state information.It is a kind of possible to be achieved in that continuing to use used always since LTE Rel-8 system codebook-based reports Mode.
But there are the following problems for the reporting schemes:
1. the antenna element of three-dimensional wave beam forming is using the active antenna of each a period of time independent control, antenna power amplifier with Antenna port integrates.In the case where antenna element is in a large number, the transmission power of each antenna element is very low.If Use conventional methods, each antenna element sends a pilot signal, and transmission power will be very low, apart from base station farther out or The lower terminal of person's signal-to-noise ratio may cannot achieve correct channel estimation, carry out influencing the accurate of information feedback Property.
2. terminal needs to carry out when antenna element number is larger in the case that each antenna element sends a pilot signal A large amount of channel estimation operation, the complexity of realization are very high, it is difficult to realize.
In view of the above-mentioned problems, the embodiment of the invention provides a kind of feedback of channel state information and obtaining scheme.This hair In bright embodiment, terminal is according to transformation pre-coding matrix relevant to the downlink channel condition of the terminal, and measurement obtains Down channel estimated value obtains equivalent descending channel information, and carries out channel according to the equivalent descending channel information of the acquisition Status information feedback realizes the purpose of information feedback.Since transformation pre-coding matrix is believed with the downlink of terminal Road state is relevant, but independent with interference and noise, therefore based on the transformation pre-coding matrix to the down channel of the terminal The signal-to-noise ratio of the down channel of the terminal can be improved after estimated value transformation.
It should be noted that the embodiment of the present invention is described with antenna element, the antenna element is using each The active antenna of a period of time independent control, antenna power amplifier are integrated with antenna port.The antenna element of other forms can also be with Using this programme.Assuming that each antenna element has corresponding Transmit Receive Unit (TXRU), i.e. TXRU is between antenna element It is to map one by one.If a TXRU is mapped to mutiple antennas unit, an antenna element described in the embodiment of the present invention Represent one group of antenna element of TXRU mapping.
The embodiment of the present invention is applied to FDD MIMO (Multi-Input Multi-Output, multiple-input and multiple-output) system System or TDD (Time Division Duplexing, time division duplex) mimo system, can solve asking for information feedback Topic.
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into It is described in detail to one step, it is clear that the described embodiments are only some of the embodiments of the present invention, rather than whole implementation Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts All other embodiment, shall fall within the protection scope of the present invention.
What is be described below is some in multiple embodiments of the invention, it is desirable to provide to basic understanding of the invention, It is not intended to confirm crucial or decisive element of the invention or limits scope of the claimed.Technical side according to the present invention Case can be replaced mutually in the case where not changing connotation of the invention and obtain other implementations.
It is information feedback flow diagram provided in an embodiment of the present invention referring to Fig. 5.The process is in terminal side It realizes.As shown, the process may include following steps:
Step 501, terminal obtain transformation pre-coding matrix relevant to the downlink channel condition of the terminal.
The down channel estimated value that step 502, the terminal are obtained according to the transformation pre-coding matrix and measurement, is obtained Obtain equivalent descending channel information；Wherein, the transformation pre-coding matrix converts the channel estimation value of at least one set of antenna port For the equivalent descending channel information of 1 equivalent aerial port；
Step 503, the terminal carry out information feedback according to the equivalent descending channel information of the acquisition.
The embodiment of the present invention is described according to the corresponding antenna port of an antenna element.It, can also when practical application To be the corresponding antenna port of mutiple antennas unit, the method for realization is identical, repeats no more.
Further, terminal also can get the antenna port grouping information of the network equipment.Terminal can be according to the network equipment The configuration information of transmission obtains the antenna port grouping information of the network equipment.The antenna port grouping information of the network equipment also with It makes an appointment, for well known to the network equipment and terminal.
The packet mode of the antenna port of the network equipment, which may is that, is divided into K group, every group of antenna port for N number of antenna port Quantity it is identical or different, N and K are the integer more than or equal to 1.Wherein, each array antenna port can be divided into one group, or Person, every a line antenna port can be divided into one group；Alternatively, in each array antenna port the first polarization direction all or part of days Line end mouth can be divided into one group, all or part of antenna ports of the second polarization direction can be divided into another group.
For example, the packet mode of specific antenna port may include: that N number of antenna port is divided into K group, every group of P A antenna port, P are the integer more than or equal to 1.Assuming that the number of every group of antenna port is identical, if the number of antenna port is not Together, treatment process is identical with method, repeats no more.For example, can be incited somebody to action for the aerial array of horizontal and vertical two-dimensional arrangements Each array antenna port is divided into one group, as shown in fig. 6, every a line antenna port is divided into one group, as shown in Figure 7.For The dual polarized antenna of horizontal and vertical two-dimensional arrangements can divide all antenna ports of the identical polarization direction of an array antenna into one Group, i.e. an array antenna are divided into two groups according to polarization direction, as shown in Figure 8；It can also be by the identical polarization direction of an array antenna Some antennas port divides one group into, for example an array antenna is divided into four groups, shown in Fig. 9 according to polarization direction.
Terminal can be applied the antenna port grouping information of the network equipment in step 501 and/or step 502, tool Holding in vivo can be found in subsequent descriptions.
In the step 501 of above-mentioned process, terminal can obtain the downlink channel condition phase with the terminal in several ways The transformation pre-coding matrix of pass, exemplarily only enumerates two ways below: mode A1 and mode A2.
Mode A1: transformation relevant to the downlink channel condition of the terminal is obtained by the configuration information that the network equipment is sent Pre-coding matrix
In aforesaid way A1, the network equipment, such as base station, configuration information can be sent to terminal, pass through the configuration information Transformation pre-coding matrix relevant to the downlink channel condition of the terminal is indicated to terminal.The configuration transmitted by the network equipment Information can be other equipment (such as network management device) configuration, be also possible to the network equipment by sending downlink ginseng Examine signal and according to the measurement feedback acquisition of terminal.The configuration information that the terminal is sent according to the network equipment obtains Transformation pre-coding matrix relevant to the downlink channel condition of the terminal.
Wherein, the DCI that the configuration information can carry out data transmission by high-level signaling or by dispatching the terminal (Downlink Control Information, Downlink Control Information) is sent to the terminal.
In aforesaid way A1, terminal can be indicated to by PMI to transformation precoding indicated by terminal.Terminal and network are set It is standby to be above provided with transformation pre-coding matrix set in advance, and the corresponding relationship of the transformation pre-coding matrix and PMI in the set is Well known to terminal and the network equipment, the corresponding relationship of pre-coding matrix and PMI is converted for example, can make an appointment, can also be passed through The network equipment is notified to terminal.In this way, terminal can obtain corresponding change from the transformation pre-coding matrix set according to the PMI Change pre-coding matrix.
Wherein, it can be one to PMI indicated by terminal and be also possible to N number of, N is integer greater than 1.If to terminal Indicated PMI is one, then a transformation pre-coding matrix in the corresponding transformation pre-coding matrix set of the PMI；Such as Fruit to PMI indicated by terminal be it is N number of, then correspond in pre-coding matrix set one of each PMI in N number of PMI prelists Code matrix, the corresponding pre-coding matrix of different PMI belong to identical or different pre-coding matrix set, and the terminal is according to The corresponding N number of pre-coding matrix of N number of PMI determines transformation pre-coding matrix.For example, transformation pre-coding matrix is (pre- by two code words An element in encoder matrix set is known as code word) it determines, it is either different that the two code words may belong to identical code book Code book (pre-coding matrix collection is collectively referred to as code book).After terminal receives the PMI of two code words of base station configuration, determine it respectively Corresponding code word, is denoted as matrix V 1 and matrix V 2 respectively, and terminal obtains transformation precoding square after carrying out operation to V1 and matrix V 2 Battle array, such as transformation pre-coding matrix V is obtained according to following operation:OrWherein,For Kronecker product calculation.
In view of the index coding mode of the pre-coding matrix in pre-coding matrix set is varied, a kind of possible feelings Condition is the pre-coding matrix indicated in a set with multiple PMI, for example, the index information of the code word in code book is with two Array representation is tieed up, in this way, a code word needs 2 PMI to indicate.Accordingly, as one embodiment of the present of invention, network Equipment can be multiple, in the corresponding transformation pre-coding matrix set of the multiple PMI one to PMI indicated by terminal Convert pre-coding matrix.
Certainly, the network equipment is also possible to the tool of the transformation pre-coding matrix to transformation pre-coding matrix indicated by terminal Body value, i.e., the value of each element in pre-coding matrix.
Preferably, the network equipment can indicate the shared transformation of all antenna port groupings to terminal by the configuration information Pre-coding matrix can also indicate that each antenna port is grouped corresponding transformation pre-coding matrix to terminal.Specific instruction Method can be found in foregoing description.
Mode A2: transformation relevant to the downlink channel condition of the terminal is obtained by the down channel measurement of terminal and is prelisted Code matrix
In aforesaid way A2, the descending channel information that terminal is obtained according to measurement determines transformation pre-coding matrix.Its In, terminal can be measured according to the downlink reference signal sent to all antenna ports, be corresponded to according to measurement result Transformation pre-coding matrix, the transformation pre-coding matrix can by all antenna ports be grouped share.Terminal can also be for every Group antenna port measures respectively obtains corresponding transformation pre-coding matrix.
For latter situation, specifically, terminal measures respectively for every group of antenna port obtains corresponding transformation in advance Encoder matrix.For example, the descending channel information that terminal can be obtained according to measurement, according to capacity maximum or receives power maximum Principle or according to the downlink of estimation reach angle Selection convert pre-coding matrix.Generally, terminal can be according under statistics Row channel information obtains the pre-coding matrix, such as after to the corresponding channel information of some antenna ports carrying out statistical average The channel information that (such as being averaged to the corresponding channel correlation matrix of horizontal antenna) obtains, or to descending channel information into The channel information obtained after statistical average when row is long, to calculate the transformation pre-coding matrix.
In the step 502 of above-mentioned process, terminal is determining that the process of equivalent descending channel information may include following steps:
Terminal carries out downlink channel condition information measurement according to the reference signal for carrying out channel state information measurement, obtains Down channel estimated value is obtained, for example, LS (least square) channel estimation method, which can be used, obtains down channel estimated value.The use It can be CSI-RS (Channel State Information in the reference signal for carrying out channel state information measurement Reference Signal, channel state information reference signals) either CRS (Cell-specific Reference Signal, cell reference signals) or it is other for carrying out the reference signal of channel state information measurement, the present invention is implemented Example to this with no restriction.The terminal carries out the down channel estimated value according to the transformation pre-coding matrix acquired Transformation obtains transformation channel estimation value；The terminal is filtered to obtain equivalent to the transformation channel estimation value acquired Descending channel information.
It in the prior art, will be for every after terminal estimates the LS channel estimation value of each antenna port The channel of a antenna port carries out the filtering of time domain and frequency domain.In the case that number of antennas in base station is more, this filtering operation A large amount of system resource will be expended.But in embodiments of the present invention, terminal is only needed for the equivalent channel after transformation It is filtered, the dimension of operation substantially reduces, to reduce the complexity and power consumption of terminal realization.
Preferably, in the step 502 of above-mentioned process, terminal can carry out equivalent down channel based on antenna port grouping The determination of information.
Specifically, terminal is according to the transformation pre-coding matrix, respectively corresponding to the K group antenna port to the network equipment Down channel estimated value is weighted merging, obtain K group transformation channel estimation value, then to the K group transformation channel estimation value into Row filtering, obtains the equivalent descending channel information of K group.
Wherein, each antenna port grouping can become channel estimation value using identical transformation pre-coding matrix It changes, different antenna port groupings can also convert channel estimation value using different transformation pre-coding matrixes.If The network equipment is that a transformation pre-coding matrix has been respectively configured in each antenna port, then terminal can use each antenna end The transformation pre-coding matrix of mouth grouping is grouped corresponding channel estimation results to the antenna port and converts.If terminal is logical Cross measurement down channel obtain transformation pre-coding matrix, as previously mentioned, terminal can for each antenna port grouping respectively into Row survey calculation obtains transformation pre-coding matrix, and terminal can be with the transformation pre-coding matrix that each antenna port is grouped to the day Line end mouth is grouped corresponding channel estimation value and is converted.
For the ease of being more clearly understood that the specific implementation process of step 502, have below with the antenna system of base station N number of Antenna port, terminal receiving antenna are the specific implementation process of description step 502 for 1 antenna.Terminal has more than 1 piece-root grafting The case where receiving antenna, every receiving antenna use here like processing mode.Meanwhile description here is with each antenna port point The channel estimation value of group is using for identical transformation pre-coding matrix, and when specific implementation, different antennae port is grouped corresponding Channel estimation value can use identical transformation pre-coding matrix, can also use transformation pre-coding matrix independent, real Existing method is identical.The process can be described in detail below:
Terminal obtains the LS channel estimation value of mutiple antennas port in a CSI-RS resource.Here, by port n Reception signal on the RE (Recourse Element, resource unit) of occupancy is denoted as Yn, the pilot signal note transmitted on the n of port For Sn, then the LS channel estimation value on the n of port are as follows:
The channel least-squares estimation value of N number of antenna port is grouped by terminal, is divided into K group, P antenna of every group of correspondence Port, N=K × P.The LS channel estimation value of kth group antenna port is arranged as vector:
Wherein,It is the LS channel estimation value for assigning to the 1st antenna port of kth group, other and so on.
Terminal converts every group of LS channel estimation value with the transformation pre-coding matrix determined:
Zk=GkV, k=1,2 ..., K ... ... ... ... ... ... (3)
Wherein, ZkIt is the transformation channel estimation value after the transformation of kth group.
Terminal handles every group of transformation channel estimation value, such as is filtered, and obtains more accurate channel and estimates Evaluation.For example, time domain least mean squares the error filtering perhaps filtering of frequency domain least mean-square error or time domain and frequency domain can be carried out United least mean-square error filtering.Refer to for the time domain least mean squares error filtering of kth group antenna port by a subframe Or the transformation channel estimation value of kth group antenna port on the same frequency is filtered in multiple subframes.If kth group antenna There are multiple transformation channel estimation values in port in the identical frequency in one or more subframe, that is, there are multiple and different time points Value, the filtering processing between these values can further suppress noise and interference, improve the precision of channel estimation.Frequency domain Filtering and time domain are identical with the treatment process of frequency-domain combined filtering.Terminal can also first carry out time-domain filtering, on this basis Frequency domain filtering is carried out again, alternatively, advanced row frequency domain filtering, carries out time-domain filtering again on this basis.
The equivalent channel estimated value of kth group after note post-processing is Wk, K group antenna port equivalent channel estimation constitute from Equivalent channel of the base station to the port K × r of terminal:
[W1 W2 … WK]=[G1V G2V … GKV]……………………(4)
Wherein, the columns of r representing matrix V.
In the step 503 of above-mentioned process, the calculating of equivalent descending channel information progress CSI of the terminal based on acquisition is simultaneously anti- Feedback, the CSI include one of following information or any combination: RI (rank indication, order instruction), PMI, CQI (Channel Quality Indicator, channel quality instruction), RSRP (Reference Signal Receiving Power, Reference Signal Received Power).For example, terminal carries out CSI based on the equivalent channel of the port K × r obtained in step 502 It calculates and feeds back, wherein when terminal carries out PMI estimation, code book used is the corresponding code book of K × r antenna port.
It should be noted that can be each CSI-RS if the network equipment is that terminal is configured with multiple CSI-RS resource Corresponding transformation pre-coding matrix, configuration and corresponding transformation of the terminal based on each CSI-RS resource is respectively configured in resource Pre-coding matrix executes process shown in fig. 5.The network equipment may be the identical transformation of all CSI-RS resource configurations Pre-coding matrix, terminal is based on each CSI-RS resource and the transformation pre-coding matrix executes process shown in fig. 5.
Pass through the description to above-mentioned process shown in fig. 5, it can be seen that terminal is according to the downlink channel condition with the terminal Relevant transformation pre-coding matrix, and the obtained down channel estimated value of measurement, obtain equivalent descending channel information, and according to The equivalent descending channel information of the acquisition carries out information feedback, realizes the purpose of information feedback. On the other hand, since transformation pre-coding matrix is relevant to the downlink channel condition of terminal, but it is independent with interference and noise, Therefore the downlink that the terminal can be improved after the down channel estimated value transformation of the terminal is believed based on the transformation pre-coding matrix The signal-to-noise ratio in road.
The embodiment of the present invention improves the precision of channel estimation, and the coverage area for being equivalent to base station expands.Assuming that n-th day The real channel of line end mouth to terminal is Hn, then the signal that terminal receives can be expressed as Yn=HnSn+In, wherein InIt is terminal The interference received in corresponding resource and noise, it is assumed that its variance is σ2, and assume to interfere and make an uproar on different antennae port The power of sound is identical, then the LS channel estimation value of port n can indicate are as follows:
It might as well assume that pilot signal is unit power, i.e. I'nVariance remain as σ2, then the LS channel estimation value Middle Signal to Noise Ratio (SNR) (Signal-to-Noise Ratio, signal-to-noise ratio) are as follows:
It is by the least square on P antenna port according to the equivalent LS channel estimation value that formula (3) is calculated What channel estimation value merged, the SNR of the equivalent LS channel estimation value then becomes:
Wherein, Hk,1Real channel of the 1st antenna port of kth group to terminal.In formula (7), if V=[Hk,1 Hk,2 … Hk,P]H, then SNR can achieve maximum value:
As can be seen that the SNR will be higher than the SNR of single port LS channel estimation value.In practice, the value meeting of V And optimal value has deviation, as long as but deviation is little, LS channel estimation value still can be improved in this method SNR, that is, reduce the evaluated error of LS channel estimation value.
Referring to Figure 10, flow diagram is obtained for channel state information provided in an embodiment of the present invention, the process is in network Equipment side is realized, for example can be executed by base station.As shown, the process may include following steps:
Step 1001, the network equipment send the reference signal for carrying out channel state information measurement.
For example, base station is that terminal configures CSI-RS resource.Base station can configure one or more CSI-RS money for terminal Source, each CSI-RS resource include mutiple antennas port.The configuration information can be configured by high-level signaling.Base station is to terminal When sending CSI-RS signal, generally, the CSI-RS signal of each antenna port is issued from a port of CSI-RS resource, For example, the antenna array of base station shows 64 antenna elements, then the CSI-RS resource has 64 antenna ports.
Step 1002, the network equipment receive terminal to be believed according to the first channel status that the reference signal is fed back Breath, first channel state information is the terminal according to transformation precoding relevant to the downlink channel condition of the terminal What matrix and the down channel estimated value obtained according to the reference signal measurement obtained；Wherein, the transformation precoding square The channel estimation value of at least one set of antenna port of the network equipment is transformed to the equivalent downlink of 1 equivalent aerial port by battle array Channel information.
The first channel state information and terminal institute that step 1003, the network equipment are fed back according to the terminal The transformation pre-coding matrix used, determination carry out data transmission used pre-coding matrix to the terminal.
Preferably, the antenna port grouping information of the network equipment is also sent to the terminal by the network equipment.Network is set It is standby that antenna grouping information can also be determined in the way of making an appointment with the terminal.
The packet mode of the antenna port of the network equipment, which may is that, is divided into K group, every group of antenna port for N number of antenna port Quantity it is identical or different, N and K are the integer more than or equal to 1.Wherein, each array antenna port can be divided into one group, or Person, every a line antenna port can be divided into one group；Alternatively, in each array antenna port the first polarization direction all or part of days Line end mouth can be divided into one group, all or part of antenna ports of the second polarization direction can be divided into another group.
For example, the packet mode of specific antenna port may include: that N number of antenna port is divided into K group, every group of P A antenna port, P are the integer more than or equal to 1.Assuming that the number of every group of antenna port is identical, if the number of antenna port is not Together, treatment process is identical with method, repeats no more.For example, can be incited somebody to action for the aerial array of horizontal and vertical two-dimensional arrangements Each array antenna port is divided into one group, as shown in fig. 6, every a line antenna port is divided into one group, as shown in Figure 7.For The dual polarized antenna of horizontal and vertical two-dimensional arrangements can divide all antenna ports of the identical polarization direction of an array antenna into one Group, i.e. an array antenna are divided into two groups, such as Fig. 8 according to polarization direction；It can also be by the part of the identical polarization direction of an array antenna Antenna port divides one group into, for example an array antenna is divided into four groups, shown in Fig. 9 according to polarization direction.
The network equipment can be applied antenna port grouping information in step 1003, can also be in the network equipment Terminal is applied during determining equivalent transformation pre-coding matrix, and particular content can be found in subsequent descriptions.
Preferably, before step 1002, that is, receive terminal in the network equipment and fed back according to the reference signal Channel state information before, can be the following steps are included: the network equipment obtains and the down channel shape of the terminal The relevant transformation pre-coding matrix of state, and transformation relevant to the downlink channel condition of the terminal is prelisted by configuration information Code matrix is indicated to the terminal.
Wherein, the network equipment can obtain the transformation pre-coding matrix of terminal in several ways, below exemplarily only Enumerate three kinds of modes: mode B1, mode B2 and mode B3.
Mode B1: the network equipment obtains the transformation pre-coding matrix of each antenna port grouping based on down channel measurement
In aforesaid way B1, the network equipment to terminal send downlink reference signal, the downlink reference signal include but It is not limited to CSI-RS signal or CRS signal.The network equipment receives the channel that terminal is fed back according to the downlink reference signal Status information determines corresponding transformation pre-coding matrix according to the channel state information.Wherein, the network equipment can be directed to every group of day Line end mouth obtains the corresponding transformation pre-coding matrix of every group of antenna port, can also be directed to all groups of antenna ports, obtain institute There is group antenna port corresponding transformation pre-coding matrix jointly.
Mode B2: the network equipment is based on channel reciprocity and obtains transformation pre-coding matrix
In aforesaid way B2, the network equipment measures the up channel of the terminal, mutual according to uplink and downlink channel Easy property obtains the second channel status information of the terminal；The network equipment is determined according to the second channel status information The transformation pre-coding matrix of the terminal.Wherein, the network equipment can be directed to every group of antenna port, obtain every group of antenna port respectively Corresponding transformation pre-coding matrix can also be directed to all groups of antenna ports, obtain the corresponding transformation jointly of all groups of antenna ports Pre-coding matrix.
Specifically, in a tdd system, the difference of the lower frequency feelings smaller relative to carrier frequency or in FDD system are gone up Under condition, uplink and downlink channel has certain equivalence.It base station can be by the channel measurement of uplink, to obtain the channel letter of downlink Breath, to calculate transformation pre-coding matrix according to descending channel information.For example, can or reception power maximum according to capacity Maximum principle selects transformation pre-coding matrix according to the user perspective of estimation.
Mode B3: the network equipment obtains transformation pre-coding matrix based on the long-term channel status information feedback of terminal
In aforesaid way B3, the network equipment is that terminal configures the macrocyclic ginseng for being used to carry out channel state information measurement Signal resource is examined, and receives the third channel state information of the terminal feedback, the third channel state information is the end What end measured and fed back according to the macrocyclic reference signal resource for carrying out channel state information measurement；The network Equipment determines the transformation pre-coding matrix of the terminal according to the third channel state information.Wherein, the network equipment can be directed to Every group of antenna port obtains the corresponding transformation pre-coding matrix of every group of antenna port, can also be directed to all groups of antenna ports, Obtain all groups of antenna ports corresponding transformation pre-coding matrix jointly.
Preferably, the network equipment can be in several ways by the transformation pre-coding matrix instruction acquired to terminal.Tool For body, if defining the set of matrices of transformation pre-coding matrix, i.e. code book, then converting pre-coding matrix can be with PMI's Form is allocated to terminal, and PMI is to convert the index of pre-coding matrix in the codebook.Base station can also will convert pre-coding matrix Each element is notified to terminal.
Optionally, the network equipment can by one or more PMI to terminal indicate transformation pre-coding matrix, this or more A transformation pre-coding matrix in the corresponding transformation pre-coding matrix set of a PMI.The network equipment can also be by N number of PMI indicates that transformation pre-coding matrix, N are the integer greater than 1 to terminal, and each PMI is corresponded in a pre-coding matrix set Pre-coding matrix, the corresponding pre-coding matrix of different PMI belong to identical or different pre-coding matrix set.The terminal according to The corresponding N number of pre-coding matrix of N number of PMI determines transformation pre-coding matrix, for example, according to N number of PMI, by N number of precoding Matrix synthesizes transformation pre-coding matrix.
Further, the network equipment can indicate that all antenna groupings altogether when indicating transformation pre-coding matrix to terminal Transformation pre-coding matrix may also indicate that each antenna is grouped corresponding transformation pre-coding matrix.
Preferably, for indicating the configuration information of transformation pre-coding matrix to terminal, can by high-level signaling or The terminal is sent to by dispatching the DCI that the terminal carries out data transmission.
In the step 1003 of the process shown in Figure 10, the CSI that the network equipment can be fed back according to terminal, and made in conjunction with terminal Transformation pre-coding matrix is calculated and carries out data transmission pre-coding matrix used to the terminal.
For example, the transformation pre-coding matrix that terminal uses is denoted as V, the corresponding precoding square of PMI in the CSI of terminal feedback Battle array is denoted as U, then can indicate the pre-coding matrix that the terminal carries out data transmission are as follows:
Or………………(9)
That is, pre-coding matrix can be write as the Kronecker of the pre-coding matrix of transformation pre-coding matrix and terminal feedback Product.The identical function of this step also may be implemented using other algorithms.
It can be seen that the embodiment of the present invention by the description above to process shown in Figure 10 and realize channel state information and obtain The purpose taken.Wherein, terminal is obtained according to transformation pre-coding matrix relevant to the downlink channel condition of the terminal, and measurement Down channel estimated value, obtain equivalent descending channel information, and letter is carried out according to the equivalent descending channel information of the acquisition Channel state information feedback.Due to transformation pre-coding matrix be relevant to the downlink channel condition of terminal, but with interfere and make an uproar Sound is independent, therefore can improve the terminal after converting based on down channel estimated value of the transformation pre-coding matrix to the terminal The signal-to-noise ratio of down channel.
Based on the same technical idea, the embodiment of the invention also provides a kind of terminal and a kind of network equipment, the terminals Above-described embodiment can be respectively applied to the network equipment.
It is the structural schematic diagram of terminal provided in an embodiment of the present invention referring to Figure 11.As shown, the terminal can include: First, which obtains module 1101, second, obtains module 1102 and feedback module 1103, in which:
First obtains module 1101, for obtaining transformation precoding square relevant to the downlink channel condition of the terminal Battle array；
Second obtains module 1102, and the down channel for being obtained according to the transformation pre-coding matrix and measurement is estimated Value, obtains equivalent descending channel information；Wherein, the transformation pre-coding matrix is by the channel estimation value of at least one set of antenna port It is transformed to the equivalent descending channel information of 1 equivalent aerial port；
Feedback module 1103, for carrying out information feedback according to the equivalent descending channel information of the acquisition.
Preferably, the first acquisition module 1101 can be specifically used for: the configuration information sent according to the network equipment, acquisition and institute The relevant transformation pre-coding matrix of downlink channel condition of terminal is stated, the configuration information is used to indicate the downlink with the terminal The relevant transformation pre-coding matrix of channel status.
Wherein, the transformation pre-coding matrix is indicated in the following manner: one or more PMI, it is one or The corresponding transformation pre-coding matrix of multiple PMI；Alternatively, N number of PMI, N are the integer greater than 1, each PMI corresponding one prelists Code matrix, the corresponding pre-coding matrix of different PMI belong to identical or different pre-coding matrix set, and the terminal is according to The corresponding N number of pre-coding matrix of N number of PMI determines transformation pre-coding matrix.
Preferably, the first acquisition module 1101 can be specifically used for: the descending channel information obtained according to measurement determines transformation Pre-coding matrix.
Preferably, the second acquisition module 1102 can be specifically used for: according to the reference for carrying out channel state information measurement Signal carries out downlink channel condition information measurement, down channel estimated value is obtained, according to the transformation pre-coding matrix to described Down channel estimated value is converted, and is obtained transformation channel estimation value, is filtered to the transformation channel estimation value acquired Wave obtains equivalent descending channel information.
Wherein, the second acquisition module 1102 can be according to the transformation pre-coding matrix, respectively to the K group antenna of the network equipment Down channel estimated value corresponding to port is weighted merging, obtains K group transformation channel estimation value, and K is whole more than or equal to 1 Number；Again the K group transformation channel estimation value acquired is filtered to obtain the equivalent descending channel information of K group.
Preferably, it may also include third in above-mentioned terminal and obtain module 1104, for obtaining the antenna port of the network equipment Grouping information.Third obtains the antenna port grouping information that gets of module 1104, can be applied to the first acquisition module 1101 and/ Or second obtain module 1102 (as shown in broken lines).
Wherein, the antenna port grouping information is that the terminal is obtained according to the configuration information that the network equipment is sent It arrives；Alternatively, the antenna port grouping information is that the terminal is made an appointment with the network equipment.
Each array antenna port is divided into one group, alternatively, every a line antenna port is divided into one group；Alternatively, each column day All or part of antenna ports of the first polarization direction are divided into all or part of days of one group, the second polarization direction in line end mouth Line end mouth is divided into another group.The specific packet mode of antenna port can be found in the description of previous embodiment, and details are not described herein.
It is the structural schematic diagram of the network equipment provided in an embodiment of the present invention referring to Figure 12.As shown, the network equipment Can include: sending module 1201, receiving module 1202 and determining module 1203, in which:
Sending module 1201, for sending the reference signal for carrying out channel state information measurement；
Receiving module 1202, the first channel state information fed back for receiving terminal according to the reference signal, institute Stating the first channel state information is the terminal according to transformation pre-coding matrix relevant to the downlink channel condition of the terminal And obtained according to the down channel estimated value that the reference signal measurement obtains；Wherein, the transformation pre-coding matrix will The channel estimation value of at least one set of antenna port of the network equipment is transformed to the equivalent down channel of 1 equivalent aerial port Information；
Determining module 1203, the first channel state information and the terminal for being fed back according to the terminal are used Transformation pre-coding matrix, determination used pre-coding matrix is carried out data transmission to the terminal.
Preferably, which further includes indicating module 1204, which is used to receive terminal in receiving module 1202 Before the channel state information fed back according to the reference signal, change relevant to the downlink channel condition of the terminal is obtained Pre-coding matrix is changed, and passes through configuration information for transformation pre-coding matrix instruction relevant to the downlink channel condition of the terminal To the terminal.
Preferably, indicating module 1204 can be directed to every group of antenna port of the network equipment, obtain and the terminal The relevant transformation pre-coding matrix of downlink channel condition.
Preferably, indicating module 1204 can measure the up channel of the terminal, according to uplink and downlink channel reciprocity Property obtains the second channel status information of the terminal；According to the second channel status information, the transformation of the terminal is determined Pre-coding matrix；Alternatively, indicating module 1204 can be specifically used for: being configured to carry out channel state information measurement for the terminal Reference signal resource, and receive the third channel state information of terminal feedback, the third channel state information is institute State what terminal was measured and fed back according to the reference signal resource for carrying out channel state information measurement；According to the third Channel state information determines the transformation pre-coding matrix of the terminal.
Wherein, the transformation pre-coding matrix is indicated in the following manner: one or more PMI, it is one or The corresponding transformation pre-coding matrix of multiple PMI；Alternatively, N number of PMI, the terminal N number of prelists according to the N number of PMI is corresponding Code matrix determines that transformation pre-coding matrix, N are the integer greater than 1, and each PMI corresponds to a pre-coding matrix, and different PMI are corresponding Pre-coding matrix belong to identical or different pre-coding matrix set.
Preferably, the antenna port grouping information of the network equipment can be also sent to terminal by sending module 1201.Or Person, determining module 1203 can also determine antenna grouping information in the way of making an appointment with the terminal.
Wherein, each array antenna port of the network equipment is divided into one group, alternatively, every a line antenna port is divided into one Group；Alternatively, all or part of antenna ports of the first polar orientation are divided into one group, the second polarity side in each array antenna port To all or part of antenna ports be divided into another group.The specific packet mode of antenna port can be found in retouching for previous embodiment It states, details are not described herein.
Referring to Figure 13, for another embodiment of the present invention provides terminal structural schematic diagram.As shown, the terminal can wrap Include: processor 1301, memory 1302, transceiver 1303 and bus interface can further include user interface.
Processor 1301, which is responsible for management bus architecture and common processing, memory 1302, can store processor 1301 and exists Execute used data when operation.Transceiver 1303 is for sending and receiving data under the control of processor 1301.
Bus architecture may include the bus and bridge of any number of interconnection, specifically represented by processor 1301 one or The various circuits for the memory that multiple processors and memory 1302 represent link together.Bus architecture can also will be such as outer Various other circuits of peripheral equipment, voltage-stablizer and management circuit or the like link together, these are all that this field institute is public Know, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 1303 can be multiple members Part includes transmitter and receiver, provides the unit for communicating over a transmission medium with various other devices.For difference User equipment, user interface can also be can the external inscribed interface for needing equipment, the equipment of connection includes but is not limited to Keypad, display, loudspeaker, microphone, control stick etc..
Processor 1301 executes following process for reading the program in memory 1302:
Obtain transformation pre-coding matrix relevant to the downlink channel condition of the terminal；
According to the down channel estimated value that the transformation pre-coding matrix and measurement obtain, equivalent down channel letter is obtained Breath；Wherein, the channel estimation value of at least one set of antenna port is transformed to 1 equivalent aerial port by the transformation pre-coding matrix Equivalent descending channel information；
Information feedback is carried out according to the equivalent descending channel information of the acquisition.
Preferably, processor 1301 can be specifically used for: the configuration information sent according to the network equipment obtains and the terminal The relevant transformation pre-coding matrix of downlink channel condition, the configuration information is used to indicate the down channel shape with the terminal The relevant transformation pre-coding matrix of state.
Wherein, the transformation pre-coding matrix is indicated in the following manner: one or more PMI, it is one or The corresponding transformation pre-coding matrix of multiple PMI；Alternatively, N number of PMI, N are the integer greater than 1, each PMI corresponding one prelists Code matrix, the corresponding pre-coding matrix of different PMI belong to identical or different pre-coding matrix set, and the terminal is according to The corresponding N number of pre-coding matrix of N number of PMI determines transformation pre-coding matrix.
Preferably, processor 1301 can be specifically used for: the descending channel information obtained according to measurement, determine transformation precoding Matrix.
Preferably, processor 1301 can be specifically used for: according to the reference signal for carrying out channel state information measurement into The measurement of row downlink channel condition information, obtains down channel estimated value；The downlink is believed according to the transformation pre-coding matrix Road estimated value is converted, and transformation channel estimation value is obtained；The transformation channel estimation value acquired is filtered to obtain Equivalent descending channel information.
Specifically, processor 1301 can be according to the transformation pre-coding matrix, respectively to the K group antenna port of the network equipment Corresponding down channel estimated value is weighted merging, obtains K group transformation channel estimation value, and K is the integer more than or equal to 1, Then K group transformation channel estimation value is filtered, obtains the equivalent descending channel information of K group.
Preferably, processor 1301 also can get the antenna port grouping information of the network equipment.
Specifically, the antenna port grouping information is that the terminal is obtained according to the configuration information that the network equipment is sent It obtains；Alternatively, the antenna port grouping information is that the terminal is made an appointment with the network equipment.
Wherein, each array antenna port is divided into one group, alternatively, every a line antenna port is divided into one group；Alternatively, each All or part of antenna ports of the first polarization direction are divided into all or portion of one group, the second polarization direction in array antenna port Divided antenna port is divided into another group.The specific packet mode of antenna port can be found in the description of previous embodiment, herein no longer It repeats.
Referring to Figure 14, for another embodiment of the present invention provides the network equipment structural schematic diagram.As shown, the network Equipment can include: processor 1401, memory 1402, transceiver 1403 and bus interface.
Processor 1401, which is responsible for management bus architecture and common processing, memory 1402, can store processor 1301 and exists Execute used data when operation.Transceiver 1403 is for sending and receiving data under the control of processor 1401.
Bus architecture may include the bus and bridge of any number of interconnection, specifically represented by processor 1401 one or The various circuits for the memory that multiple processors and memory 1402 represent link together.Bus architecture can also will be such as outer Various other circuits of peripheral equipment, voltage-stablizer and management circuit or the like link together, these are all that this field institute is public Know, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 1403 can be multiple members Part includes transmitter and transceiver, provides the unit for communicating over a transmission medium with various other devices.Processor 1401 are responsible for management bus architecture and common processing, and memory 1402 can store processor 1401 to be made when executing operation Data.
Processor 1401 executes following process for reading the program in memory 1402:
The reference signal for carrying out channel state information measurement is sent by transceiver 1403；
The first channel state information for being fed back according to the reference signal of terminal is received by transceiver 1403, described the One channel state information be the terminal according to transformation pre-coding matrix relevant to the downlink channel condition of the terminal and It is obtained according to the down channel estimated value that the reference signal measurement obtains；Wherein, the transformation pre-coding matrix will be described The channel estimation value of at least one set of antenna port of the network equipment is transformed to the equivalent down channel letter of 1 equivalent aerial port Breath；
Pre-coding matrix is converted used in the first channel state information fed back according to the terminal and the terminal, Determination carries out data transmission used pre-coding matrix to the terminal.
Preferably, processor 1401 can also be used in: receive terminal according to the reference signal institute by transceiver 1403 Before first channel state information of feedback, transformation pre-coding matrix relevant to the downlink channel condition of the terminal is obtained, And transformation pre-coding matrix instruction relevant to the downlink channel condition of the terminal is given to the terminal by configuration information.
Preferably, processor 1401 can be specifically used for: for every group of antenna port of the network equipment, obtain with it is described The relevant transformation pre-coding matrix of the downlink channel condition of terminal.
Preferably, processor 1401 can be specifically used for: measuring to the up channel of the terminal, believed according to uplink and downlink Road reciprocity obtains the second channel status information of the terminal；According to the second channel status information, the terminal is determined Transformation pre-coding matrix.Alternatively, processor 1401 can be specifically used for: being configured to carry out channel state information for the terminal The reference signal resource of measurement, and receive by transceiver 1403 the third channel state information of terminal feedback, described the Three channel state informations are that the terminal measures simultaneously according to the reference signal resource for carrying out channel state information measurement Feedback；According to the third channel state information, the transformation pre-coding matrix of the terminal is determined.
Wherein, the transformation pre-coding matrix is indicated in the following manner: one or more PMI, it is one or The corresponding transformation pre-coding matrix of multiple PMI；Alternatively, N number of PMI, the terminal N number of prelists according to the N number of PMI is corresponding Code matrix determines that transformation pre-coding matrix, N are the integer greater than 1, and each PMI corresponds to a pre-coding matrix, and different PMI are corresponding Pre-coding matrix belong to identical or different pre-coding matrix set.
Preferably, processor 1401 can also be used in: is grouped the antenna port of the network equipment by transceiver 1403 Information is sent to terminal.Alternatively, processor 1401 can also determine antenna grouping letter in the way of making an appointment with the terminal Breath.
Wherein, each array antenna port is divided into one group, alternatively, every a line antenna port is divided into one group；Alternatively, each All or part of antenna ports of the first polar orientation are divided into all or portion of one group, the second polar orientation in array antenna port Divided antenna port is divided into another group.The specific packet mode of antenna port can be found in the description of previous embodiment, herein no longer It repeats.
In conclusion terminal is according to change relevant to the downlink channel condition of the terminal in the above embodiment of the present invention Pre-coding matrix, and the down channel estimated value that measurement obtains are changed, obtains equivalent descending channel information, and according to the acquisition Equivalent descending channel information carry out information feedback, realize the purpose of information feedback.On the other hand, Since transformation pre-coding matrix is relevant to the downlink channel condition of terminal, but it is independent with interference and noise, therefore be based on Noise of the transformation pre-coding matrix to the down channel that can improve the terminal after the down channel estimated value transformation of the terminal Than.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to include these modifications and variations.

Claims (23)

1. a kind of channel state information feedback method, which is characterized in that this method comprises:
Terminal obtains transformation pre-coding matrix relevant to the downlink channel condition of the terminal；Wherein, the transformation precoding The channel estimation value of at least one set of antenna port is transformed to the equivalent descending channel information of 1 equivalent aerial port by matrix；
The terminal carries out downlink channel condition information measurement according to the reference signal for carrying out channel state information measurement, obtains Down channel estimated value corresponding to the K group antenna port of the network equipment is obtained, K is the integer more than or equal to 1；
The terminal is according to the transformation pre-coding matrix, and downlink corresponding to the K group antenna port to the network equipment is believed respectively Road estimated value is weighted merging, obtains K group transformation channel estimation value；
The terminal is filtered K group transformation channel estimation value, obtains the equivalent descending channel information of K group；
The terminal carries out information feedback according to the equivalent descending channel information of K group of the acquisition.
2. the method as described in claim 1, which is characterized in that the terminal obtains the downlink channel condition phase with the terminal The transformation pre-coding matrix of pass, specifically includes:
The configuration information that the terminal is sent according to the network equipment obtains transformation relevant to the downlink channel condition of the terminal Pre-coding matrix, the configuration information are used to indicate transformation pre-coding matrix relevant to the downlink channel condition of the terminal.
3. method according to claim 2, which is characterized in that the transformation pre-coding matrix is referred in the following manner Show:
The corresponding transformation pre-coding matrix of one or more pre-coding matrix instruction PMI, one or more of PMI；Alternatively,
N number of PMI, N are integer greater than 1, the corresponding pre-coding matrix of each PMI, the corresponding pre-coding matrix category of different PMI In identical or different pre-coding matrix set, the terminal is determined according to the corresponding N number of pre-coding matrix of the N number of PMI to be become Change pre-coding matrix.
4. the method as described in claim 1, which is characterized in that the terminal obtains the downlink channel condition phase with the terminal The transformation pre-coding matrix of pass, specifically includes:
The descending channel information that the terminal is obtained according to measurement determines transformation pre-coding matrix.
5. method according to any one of claims 1 to 4, which is characterized in that further include:
The terminal obtains the antenna port grouping information of the network equipment.
6. method as claimed in claim 5, which is characterized in that the antenna port grouping information is the terminal according to What the configuration information that the network equipment is sent acquired；Alternatively,
The antenna port grouping information is that the terminal is made an appointment with the network equipment.
7. method as claimed in claim 5, which is characterized in that each array antenna port is divided into one group, alternatively, every a line day Line end mouth is divided into one group；Alternatively,
All or part of antenna ports of the first polarization direction are divided into one group, the second polarization direction in each array antenna port All or part of antenna ports are divided into another group.
8. a kind of channel state information acquisition method characterized by comprising
The network equipment sends the reference signal for carrying out channel state information measurement；
The network equipment receives the first channel state information that terminal is fed back according to the reference signal, first channel Status information is the terminal according to transformation pre-coding matrix relevant to the downlink channel condition of the terminal and according to institute State what the down channel estimated value that reference signal measurement obtains obtained；Wherein, the transformation pre-coding matrix sets the network The channel estimation value of standby at least one set of antenna port is transformed to the equivalent descending channel information of 1 equivalent aerial port；
Transformation used in the first channel state information that the network equipment is fed back according to the terminal and the terminal is pre- Encoder matrix, determination carry out data transmission used pre-coding matrix to the terminal.
9. method according to claim 8, which is characterized in that the network equipment receives terminal according to the reference signal institute Before first channel state information of feedback, further includes:
The network equipment obtains transformation pre-coding matrix relevant to the downlink channel condition of the terminal, and by matching confidence Breath gives transformation pre-coding matrix instruction relevant to the downlink channel condition of the terminal to the terminal.
10. method as claimed in claim 9, which is characterized in that the network equipment obtains the down channel with the terminal The relevant transformation pre-coding matrix of state, specifically includes:
The network equipment is directed to every group of antenna port of the network equipment, obtains the downlink channel condition phase with the terminal The transformation pre-coding matrix of pass.
11. method as claimed in claim 9, which is characterized in that the network equipment obtains the down channel with the terminal The relevant transformation pre-coding matrix of state, specifically includes:
The network equipment measures the up channel of the terminal, obtains the terminal according to uplink and downlink channel reciprocity Second channel status information；
The network equipment determines the transformation pre-coding matrix of the terminal according to the second channel status information；
Alternatively, the network equipment obtains transformation pre-coding matrix relevant to the downlink channel condition of the terminal, it is specific to wrap It includes:
The network equipment is that the terminal is configured to carry out the reference signal resource of channel state information measurement, and receives institute The third channel state information of terminal feedback is stated, the third channel state information is that the terminal is used to carry out letter according to described The reference signal resource of channel state information measurement is measured and is fed back；
The network equipment determines the transformation pre-coding matrix of the terminal according to the third channel state information.
12. method as claimed in claim 9, which is characterized in that the transformation pre-coding matrix is referred in the following manner Show:
The corresponding transformation pre-coding matrix of one or more pre-coding matrix instruction PMI, one or more of PMI；Alternatively,
N number of PMI, the terminal determine transformation pre-coding matrix according to the corresponding N number of pre-coding matrix of the N number of PMI, and N is big In 1 integer, the corresponding pre-coding matrix of each PMI, the corresponding pre-coding matrix of different PMI belongs to identical or different pre- Encoder matrix set.
13. the method as described in any one of claim 8 to 12, which is characterized in that further include:
The antenna port grouping information of the network equipment is sent to the terminal by the network equipment；
Alternatively, the network equipment determines antenna grouping information in the way of making an appointment with the terminal.
14. method as claimed in claim 13, which is characterized in that each array antenna port is divided into one group, alternatively, every a line Antenna port is divided into one group；Alternatively,
All or part of antenna ports of the first polar orientation are divided into one group, the second polar orientation in each array antenna port All or part of antenna ports are divided into another group.
15. a kind of terminal characterized by comprising
First obtains module, for obtaining transformation pre-coding matrix relevant to the downlink channel condition of the terminal；Wherein, institute State the equivalent downlink that the channel estimation value of at least one set of antenna port is transformed to 1 equivalent aerial port by transformation pre-coding matrix Channel information；
Second obtains module, for carrying out downlink channel condition letter according to the reference signal for carrying out channel state information measurement Breath measurement, obtains down channel estimated value corresponding to the K group antenna port of the network equipment, according to the transformation precoding square Battle array, down channel estimated value corresponding to the K group antenna port to the network equipment is weighted merging respectively, obtains the transformation of K group Channel estimation value, and K group transformation channel estimation value is filtered, obtain the equivalent descending channel information of K group；Wherein, K is Integer more than or equal to 1；
Feedback module carries out information feedback for the equivalent descending channel information of K group according to the acquisition.
16. terminal as claimed in claim 15, which is characterized in that the first acquisition module is specifically used for: being set according to network The configuration information that preparation is sent obtains transformation pre-coding matrix relevant to the downlink channel condition of the terminal, described to match confidence Breath is used to indicate transformation pre-coding matrix relevant to the downlink channel condition of the terminal.
17. terminal as claimed in claim 15, which is characterized in that the first acquisition module is specifically used for: according to measuring The descending channel information arrived determines transformation pre-coding matrix.
18. the terminal as described in any one of claim 15 to 17, which is characterized in that further include:
Third obtains module, for obtaining the antenna port grouping information of the network equipment.
19. a kind of network equipment characterized by comprising
Sending module, for sending the reference signal for carrying out channel state information measurement；
Receiving module, the first channel state information fed back for receiving terminal according to the reference signal, first letter Channel state information be the terminal according to transformation pre-coding matrix relevant to the downlink channel condition of the terminal and according to What the down channel estimated value that the reference signal measurement obtains obtained；Wherein, the transformation pre-coding matrix is by the network The channel estimation value of at least one set of antenna port of equipment is transformed to the equivalent descending channel information of 1 equivalent aerial port；
Determining module, transformation used in the first channel state information and the terminal for being fed back according to the terminal are pre- Encoder matrix, determination carry out data transmission used pre-coding matrix to the terminal.
20. the network equipment as claimed in claim 19, which is characterized in that further include:
Indicating module, for the receiving module receive channel state information that terminal is fed back according to the reference signal it Before, transformation pre-coding matrix relevant to the downlink channel condition of the terminal is obtained, and will be with the end by configuration information The relevant transformation pre-coding matrix instruction of the downlink channel condition at end gives the terminal.
21. the network equipment as claimed in claim 20, which is characterized in that the indicating module is specifically used for: being directed to the net Every group of antenna port of network equipment obtains transformation pre-coding matrix relevant to the downlink channel condition of the terminal.
22. the network equipment as claimed in claim 20, which is characterized in that the indicating module is specifically used for: to the terminal Up channel measure, the second channel status information of the terminal is obtained according to uplink and downlink channel reciprocity；According to institute Second channel status information is stated, determines the transformation pre-coding matrix of the terminal；
Alternatively, the indicating module is specifically used for: being configured to carry out the reference letter of channel state information measurement for the terminal Number resource, and the third channel state information of the terminal feedback is received, the third channel state information is the terminal root It measures and feeds back according to the reference signal resource for carrying out channel state information measurement；According to the third channel status Information determines the transformation pre-coding matrix of the terminal.
23. the network equipment as described in any one of claim 19 to 22, which is characterized in that the sending module is also used to: The antenna port grouping information of the network equipment is sent to the terminal；Alternatively,
The determining module is also used to: antenna grouping information is determined in the way of making an appointment with the terminal.
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