CN101771514A - Multi-level feedback method of channel information and system thereof - Google Patents

Multi-level feedback method of channel information and system thereof Download PDF

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Publication number
CN101771514A
CN101771514A CN201010114493A CN201010114493A CN101771514A CN 101771514 A CN101771514 A CN 101771514A CN 201010114493 A CN201010114493 A CN 201010114493A CN 201010114493 A CN201010114493 A CN 201010114493A CN 101771514 A CN101771514 A CN 101771514A
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code book
level
code
channel
information
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CN101771514B (en
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陈艺戬
李儒岳
张峻峰
李书鹏
徐俊
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

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  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
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Abstract

The invention provides a multi-level feedback method of channel information and a system thereof, comprising: a receiver terminal gives feedback of at least two levels of channel indicating information to a sending terminal; the sending terminal obtains the channel information according to the channel indicating information which is fed back by the receiver terminal. The invention also provides a multi-level feedback system of channel information. Through the feedback of the multi-level channel information, the feedback accuracy of the channel information is increased; the calculation complexity is lowered down.

Description

A kind of channel information multi-level feedback method and system
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of channel information multi-level feedback method and system.
Background technology
In the radio communication,, can take the mode of spatial reuse to obtain higher speed if transmitting terminal and receiving terminal all use many antennas.With respect to general method for spacial multiplex, a kind of technique for enhancing is that the receiving terminal feedback channel information is given transmitting terminal, and transmitting terminal uses some emission precoding techniques according to the channel information that obtains, and improves transmission performance greatly.A kind of simple implementation method promptly directly uses the channel characteristics Vector Message to carry out precoding, is mainly used in the Single User MIMO (multiple-input and multiple-output).Some other more excellent but more complicated method is also arranged, be mainly used in the multiuser MIMO, but all need channel information more accurately.
In long evolving system (LTE:Long Term Evolution), the feedback of channel information mainly is to utilize better simply single code book feedback method, and the performance of the emission precoding technique of MIMO mainly depends on the wherein accuracy of code book feedback.
Channel information based on code book quantizes feedback, and its basic principle is to suppose that the Limited Feedback channel capacity is B bps/Hz.The number of so available code word is N=2 BIndividual.The space of feature vectors of channel matrix is through quantizing to constitute the code book space
Figure GSA00000020653400011
Transmitting terminal is with the common preservation of receiving terminal or produce this code book (sending and receiving end is identical) in real time.Each channel is realized H, receiving terminal according to certain criterion from
Figure GSA00000020653400012
Code word of mating most of middle selection with channel
Figure GSA00000020653400013
And code word sequence number i fed back to transmitting terminal.Transmitting terminal finds pre-encoding codeword according to this sequence number Obtain channel information, be mainly the characteristic vector information of channel.
In general
Figure GSA00000020653400015
Can further be divided into the corresponding code book of a plurality of Rank (order), each Rank can corresponding a plurality of code words quantize the pre-coding matrix that the channel characteristics vector under this Rank constitutes down.Because the Rank and the non-zero characteristics vector number of channel equate that therefore, the code word when in general Rank is N all can have the N row.So we can be code book Be divided into a plurality of sub-codebooks by Rank.
Table 1
Figure GSA00000020653400021
Wherein, the code word that o'clock need store in Rank＞1 all is a matrix form, and for example the code book in the LTE agreement is exactly the feedback method that adopts this codebook quantification, sees Table 2, it should be noted that code book in the table 2 is quantified precision and the expense code book of suitable Single User MIMO.
The precoding codebook of descending 4 antennas of table 2
Figure GSA00000020653400022
Figure GSA00000020653400031
Advanced long-term evolution system (LTE-A:Long Term EvolutionAdvanced) as the continuation evolution of LTE needs to support bigger system bandwidth (reaching as high as 100MHz), and need to improve the spectrum efficiency of average spectral efficiency (ase) and Cell Edge User, for this reason, LTE-A need strengthen some technology, as multiuser MIMO (MU-MIMO), and this task that to be the feedback accuracy of the single user's code book of existing LTE can't bear.
In LTE, the shared cover code book of SU-MIMO and MU-MIMO because MU-MIMO is limited in Rank1, so the code book feedback method of regulation during only according to Rank1 finds the quantization code word of characteristic vector from its corresponding 4bit code book, and feeds back.In LTE-A,, therefore need the bigger code book of expense because the code book precision of MU needs further to strengthen.Simultaneously because in order to obtain better dynamically handoff gain, SU-MIMO and MU-MIMO are integrated into same transmission mode.Wherein must there be a feedback technique under the feedback model to need to support to support preferably SU-MIMO to use simultaneously and the MU-MIMO application.
A kind of method is promptly according to required MU-MIMO code book expense in the prior art, and independent design one is overlapped the code book of high expense again, such as: use the 6bit Rank1 code book in the 802.16m standard, as shown in table 3.
Table 3 802.16m code book
Figure GSA00000020653400032
Figure GSA00000020653400041
Figure GSA00000020653400051
In the table 3, commentaries on classics order of each row is represented a Rank1 code book, and for the independently design of the code book of high expense of code book of the code book and the high Rank of higher expense, code word number is exponential growth, be a very complicated technology problem, and compatible bad with original code word.
The defective of prior art is: compatible bad with the LTE agreement.When feedback, need the PMI information of feedback expression SU code book, and need the code book of the MU of feedback expression simultaneously.Suppose that the MU code book is 6bit, need feed back the code book information of 10bit during so high Rank.In addition, receiving terminal UE needs a lot of code words of storing multiple sets code book, and carries out repeatedly codebook selecting when codebook selecting, and amount of calculation is very big.
Another method promptly is rotated the LTE code book with the correlation matrix information of channel in the prior art:
C = R 1 2 × C R 8
Wherein C represents C R8The code book that obtains after the rotation, R=H HH, H are dimension N r* N tChannel matrix, N rBe reception antenna number, N tBe number of transmit antennas.
Owing to comprised the distributed intelligence of characteristic vector in the channel correlation matrix information.Also can quantize at the bigger regional emphasis of distribution probability at the distribution probability of characteristic vector after code word in the code book is rotated, quantified precision is further improved.
But this method can only solve quantified precision problem under the scene that contains certain correlation, for the not effect fully of irrelevant scene, and non-correlation channel scene focus scene such as city microcellulor often.The feedback of channel correlation matrix also needs bigger feedback overhead in addition.
Summary of the invention
It is little that the technical problem to be solved in the present invention provides a kind of feedback overhead, compatible good, and the feedback combination flexibly, computation complexity was low when code word was selected, and overall high channel information classification feedback method and the system of quantified precision.
In order to address the above problem, the invention provides a kind of channel information multi-level feedback method, comprising:
Receiving terminal feeds back at least the two-stage channel indicating information to transmitting terminal;
Transmitting terminal obtains channel information according to the described channel indicating information of receiving terminal feedback.
Further, described method also can have following characteristics, and described receiving terminal feeds back M level channel indicating information to transmitting terminal, the corresponding m level of the channel indicating information of described M＞1, the m level code book A mA code word
Figure GSA00000020653400072
M=1...M, S mExpression code book A mThe index of middle code word; Wherein, the 1st grade of code book A 1Code word can independent present channel information;
M code word of described M level code book Common indication one channel information is Ω is a function, described transmitting terminal basis
Figure GSA00000020653400075
Obtain channel information.
Further, described method also can have following characteristics, and described Ω is one of following computing or its combination: take advantage of on premultiplication, the right side, dot product, poor and and computing.
Further, described method also can have following characteristics, m+1 level code book A M+1Be independent of the code word of m level code book
Figure GSA00000020653400081
Further, described method also can have following characteristics, described m+1 level code book A M+1There is a center O M+1, described O M+1Be any matrix or vector, described A M+1Comprise or do not comprise described center O M+1, and described A M+1In remove center O M+1Outer code word and described center O M+1Distance identical.
Further, described method also can have following characteristics, and described receiving terminal feeds back M level channel indicating information to transmitting terminal, the corresponding m level of the channel indicating information of described M＞1, the m level code book A mA code word
Figure GSA00000020653400082
Wherein, the 1st grade of code book A 1Code word can independent present channel information, S mExpression code book A mThe index of middle code word, m+1 level code book A M+1According to m level code book A mDescribed code word
Figure GSA00000020653400083
Generate m=1...M, M＞1;
The code word of described M level code book
Figure GSA00000020653400084
Indicate a channel information; Described transmitting terminal is according to the code word of described M level code book
Figure GSA00000020653400085
Obtain channel information.
Further, described method also can have following characteristics, described m+1 level code book Described F is mapping relations or a functional relation, C B, mIt is a code book.Further, described method also can have following characteristics, when described F is mapping relations, and described C B, mBe a fixed codebook,
Figure GSA00000020653400087
Corresponding C B, mIn a plurality of codeword information.
Further, described method also can have following characteristics, and is when described F is a functional relation, described C B, mIt is the code book that the code word that distributes around at a center constitutes.
Further, described method also can have following characteristics, and described transmitting terminal obtains a described M code word Channel indicating information after, according to the channel indicating information of m level from code book A mObtain code word
Figure GSA000000206534000810
According to
Figure GSA000000206534000811
And code book A mObtain code book A M+1, when initial, according to the 1st grade of channel indicating information from code book A 1In obtain According to
Figure GSA000000206534000813
And code book A 1Obtain code book A 2
Obtain code book A MAfter, feed back M level channel indicating information according to receiving terminal, from code book A MIn obtain code word
Figure GSA000000206534000814
Further, described method also can have following characteristics, described the 1st grade of code book A 1Be the code book of stipulating in the long evolving system standard agreement; Perhaps, be the code book behind the code book process premultiplication matrix of stipulating in the long evolving system standard agreement, promptly D is the code book of stipulating in the long evolving system standard agreement, and R is a channel correlation matrix.
The present invention also provides a kind of system of channel information multi-level feedback, comprising:
Receiving terminal is used to feed back at least the two-stage channel indicating information to transmitting terminal;
Transmitting terminal is used for obtaining channel information according to the described channel indicating information of receiving terminal feedback.
Further, described system also can have following characteristics, and described receiving terminal is used to feed back M level channel indicating information to transmitting terminal, the corresponding m level of the channel indicating information of described M＞1, the m level code book A mA code word
Figure GSA00000020653400091
M=1...M, S mExpression code book A mThe index of middle code word; Wherein, the 1st grade of code book A 1Code word can independent present channel information;
M code word of described M level code book
Figure GSA00000020653400092
Common indication one channel information is
Figure GSA00000020653400093
Ω is a function;
Described transmitting terminal is used for basis Obtain channel information.
Further, described system also can have following characteristics, and described receiving terminal is used to feed back M level channel indicating information to transmitting terminal, the corresponding m level of the channel indicating information of described M＞1, the m level code book A mA code word
Figure GSA00000020653400095
Wherein, the 1st grade of code book A 1Code word can independent present channel information, S mExpression code book A mThe index of middle code word, m+1 level code book A M+1According to m level code book A mDescribed code word
Figure GSA00000020653400096
Generate m=1...M, M＞1; The code word of described M level code book Indicate a channel information;
Described transmitting terminal is used for the code word according to described M level code book
Figure GSA00000020653400098
Obtain channel information.
By basic code book and the mode that increases progressively code book combination feedback, help to carry out more flexibly the feedback of different stage, when improving overall quantified precision, the Control and Feedback expense; And senior code book based on the mode of previous stage code book information design with respect in the prior art independently the code book design can obviously reduce the computation complexity of code word.
Embodiment
The invention provides a kind of channel information multi-level feedback method, comprising:
Receiving terminal feedback M level channel indicating information is to transmitting terminal;
Transmitting terminal obtains channel information according to described M level channel indicating information.
Specifically be divided into two kinds of implementations:
(1) first kind of situation:
Described receiving terminal feeds back M level channel indicating information to transmitting terminal, the corresponding m level of the channel indicating information of described M＞1, the m level code book A mA code word
Figure GSA00000020653400101
M=1...M, S mExpression code book A mThe index of middle code word; Wherein, the 1st grade of code book A 1Code word can independent present channel information;
M code word of described M level code book Common indication one channel information is
Figure GSA00000020653400103
Ω is a function, described transmitting terminal basis
Figure GSA00000020653400104
Obtain channel information.(annotate: first kind of situation)
Described Ω is that premultiplication, the right side are taken advantage of, dot product, poor and or its combination.
M+1 level code book A M+1Be independent of the code word of m level code book
Figure GSA00000020653400105
Described m+1 level code book A M+1There is a center O M+1, described O M+1Be any matrix or vector, described A M+1Comprise or do not comprise described center O M+1
(2) second kinds of situations:
Described receiving terminal feeds back M level channel indicating information to transmitting terminal, the corresponding m level of the channel indicating information of described M＞1, the m level code book A mA code word
Figure GSA00000020653400106
Wherein, the 1st grade of code book A 1Code word can independent present channel information, S mExpression code book A mThe index of middle code word, m+1 level code book A M+1According to m level code book A mDescribed code word
Figure GSA00000020653400107
Generate m=1...M, M＞1;
The code word of described M level code book
Figure GSA00000020653400108
Indicate a channel information; Described transmitting terminal is according to the code word of described M level code book Obtain channel information.
Described m+1 level code book Described F is mapping relations or a functional relation, C B, mIt is a code book.
When described F is mapping relations, described C B, mBe a fixed codebook,
Figure GSA000000206534001011
Corresponding C B, mIn a plurality of codeword information.
When described F is a functional relation, described
Figure GSA000000206534001012
C B, mIt is the code book that the code word that distributes around at a center constitutes.
Described transmitting terminal obtains a described M code word Channel indicating information after, according to the channel indicating information of m level from code book A mObtain code word According to
Figure GSA000000206534001015
And code book A mObtain code book A M+1, when initial, according to the 1st grade of channel indicating information from code book A 1In obtain According to
Figure GSA000000206534001017
And code book A 1Obtain code book A 2
Obtain code book A MAfter, feed back M level channel indicating information according to receiving terminal, from code book A MIn obtain code word
Figure GSA00000020653400111
Wherein, in first kind of situation and the second kind of situation, described the 1st grade of code book A 1Be the code book of stipulating in the long evolving system standard agreement; Perhaps, be the code book behind the code book process premultiplication matrix of stipulating in the long evolving system standard agreement, promptly D is the code book of stipulating in the long evolving system standard agreement, and R is a channel correlation matrix.
Be fed back to example with secondary below and further specify the present invention.
Comprise in the feedback of channel characteristics information can independent present the quantitative information of characteristic vector, certain code word A among the indication one-level code book A iPrecoding indication (PMI) information and another one secondary code book B in certain code word B jPrecoding indication (PMI) information.
Wherein, first order code book A can be arbitrary code book, and described A code book further can be the code book of stipulating in the LTE standard agreement, A iFurther can be any code word of regulation in the LTE standard agreement 36.211; Described code book A further can be for certain determines that code book D is whole through the code book behind the premultiplication matrix in the prior art 2
Figure GSA00000020653400113
D also can be the code book of stipulating in the LTE standard agreement.
First kind of implication of feedback expression is:
Characteristic vector quantitative information of the common indication of first and second grade feedback is Ω (A i, B j), wherein Ω represents a function.The implication of feedback is according to A iAnd B jCommon definite, obtain final characteristic vector quantization means.Different A iIdentical B jIndicate different code words, identical A iDifferent B jIndicate different code words.Ω can represent a variety of functional relations, and as premultiplication, take advantage of on the right side, and the dot product form is poor in addition, or and etc., and the combination of various functional relations, be not limited thereto.
Described function Ω can for:
According to A iObtain a matrix Ψ (A with a function Ψ i), use Ψ (A then i) to B jCarry out premultiplication, take advantage of or operation such as dot product on the right side.Described matrix Ψ (A i) further can be unitary matrice.Described unitary matrice further in the past r classify A as i(r is the Rank number);
Perhaps, described function Ω also can for:
According to B jObtain a matrix ζ (B with a function ζ j), then to A iCarry out premultiplication, take advantage of or operation such as dot product on the right side.Described matrix ζ (B j) further can be a unitary matrice.
Also can be to utilize B jDirectly to A iCarry out premultiplication, take advantage of or operation such as dot product on the right side.
Wherein, described code book B can be independent of A iExist, have a center O that spells out.When described code book B does not exist one to spell out the center, also can find a vector or a matrix O with its identical dimensional, make code word wherein identical or be 0 to the distance of O.Code book B can comprise O also can not comprise O.O can be any vector or matrix, further can only contain the matrix or the vector of non-0 element for each row.
Second kind of situation that the feedback implication characterizes:
The characteristic vector quantitative information is characterized by B j, wherein, part or all of code word can be expressed as B=F (A among the code book B i, C b);
F can be mapping relations; Pass through A iAnd mapping relations F, can be from code book C bIn find part or all of code word to be defined as part or all of code word among the B.When described F is expressed as a kind of mapping relations, C bBe interpreted as a fixing code book.Each A iCorresponding a plurality of C bMiddle codeword information.Further, according to the information RI of Rank (Rank Indicator, order indication) and in conjunction with other feedback information, A iCan corresponding C bIn different many set of code words.That is to say, for different A i, the implication of second level feedback is different.
Perhaps, F also can be expressed as a functional relation; According to A iWith code book C bAnd F can determine a code book B.Described, F can further be that a premultiplication is operating as B=ξ (A i) C b, described ξ (A i) can further be a unitary matrice, described unitary matrice further in the past r classify A as i(r is the Rank number).C bBe to be configured in the code book that o equally distributed code word on every side in center constitutes.
Described one-level code book can be considered as basic code book, can separate configurations be that a kind of feedback model carries out the characteristic vector quantification, and just quantified precision is lower.But can be suitable for SU-MIMO preferably, secondary code book, three grades of code books and more senior code book can be considered as increasing progressively code book or precision is adjusted code book.
Second kind of situation compared with first kind of situation, according to A iCode word feedback B among the code book B that obtains jCan direct representation be the characteristic vector quantitative information, and first kind of situation, B jMust and A iIn conjunction with characterizing characteristic vector quantitative information accurately jointly.
Same, the feedback of 3 grades or more senior code book also has two kinds of corresponding situations,
First kind of situation:
The information of 3 grades of feedback signs is certain the code word C among 3 grades of code book B pThe implication of feedback expression is that characteristic vector quantitative information of the common indication of first, second and third grade feedback is Γ (A i, B j, C q), wherein Γ represents a function.The implication of feedback is according to A i, B jAnd C pCommon definite, obtain final characteristic vector quantization means.Different B jIdentical C pIndicate different code words.
Γ can represent a variety of functional relations, and as premultiplication, take advantage of on the right side, and the dot product form is poor in addition, or and etc. and the combination of computing, be not limited thereto.
Second kind of situation:
Part or all of code word can be expressed as B=F (A among the secondary code book B i, C b), part or all of code word can be expressed as C=F (B among three grades of code book C j, C ' b)
F is mapping relations or a function, C ' bCan with C bIdentical or different.
Described the 1st, 2,3 or the feedback frequency of more senior feedback can dispose, can be different.Exemplary is that basic code book (one-level code book) update frequency is slow, and for example 100ms upgrades once, and 2 grades, 3 grades code books are finely tuned because of belonging to code book, and expense is little, and that then can upgrade is faster, and for example 5ms upgrades once.Certainly do not get rid of the way of upgrading simultaneously.
Difference according to classification codebook configuration feedback velocity, have several fundamental modes, first kind is had only basic code book feedback, second kind of existing basic code book feedback also has the code book of increasing progressively feedback, the basis code book feedback and the code book feedback that increases progressively have constituted a complete code book feedback, and this complete code book feedback can clearly be divided into basic code book feedback and increase progressively the code book feedback, the basis code book can use separately, and in the prior art scheme 1, can't originally be partitioned into the basic code book that can use separately from a full code.
Feedback system of the present invention can strong support SU-MIMO and MU-MIMO dynamically switch transmission mode.
With Rank1, the Rank2 feedback of channel information is that example is set forth concrete implementation method below, but the invention is not restricted to this 2 kinds of situations.
Embodiment 1
In the present embodiment, multi-stage channel information feedback method provided by the invention comprises:
Step 110 is determined the Rank of channel, and select corresponding code word A from the corresponding code book of Rank value i, as the 1st grade of feedback.
Wherein, first order code book uses the LTE code book in the table 2, and perhaps, first order code book uses the postrotational LTE code book of channel correlation matrix in the prior art, among quantification and feedback method and the LTE under the SU-MIMO pattern feedback method identical.
Wherein, can from the 1st grade of code book A, select a suitable code word A according to characteristic vector information EigenVector according to principles such as chordal distance maximum, throughput-maximized or SINR maximizations iThe first order as characteristic vector quantizes.
Step 120, the 2nd grade of code word B that is fed back among the another one code book B jPMI information.UE chooses B jThe back is by the form feedback B of PMI j, UE chooses B jMethod be:
A) fixing or dynamically produce a secondary code book B, and define 1 O of code word distribution center, O can be included among the B, also can not comprised by B.Usually O can be chosen for matrix or the vector that each row only contains non-0 element, the typical case of O follow the example of into:
1 0 0 0 , 1 0 0 1 0 0 0 0
B) pass through A iDetermine a matrix Rot with O, can be so that A iBe rotated to O after multiply by Rot,, can carry out identical operations and obtain for the matrix of characteristic vector or its formation
EigenVector’＝Rot×EigenVector
Because A iMultiply by identical matrix with EigenVector, do not change its error character.So EigenVector be rotated to O around.Code word by distributing around the O can find a code word B j, " B jWith O error relation " and " EigenVector and A iError relation " the most similar or identical.
Step 130, the base station obtains A iInformation and B jThe inverse operation R of rotation in carry out step 120 after the information -1, R -1By the 1st grade of feedback information A iDetermine with O.Can obtain the higher characteristic vector information of quantified precision by inverse operation.
Embodiment 2
Step 210 is determined the Rank of channel, and select corresponding code word A from the corresponding code book of Rank value iAs the 1st grade of feedback.
Can from the 1st grade of code book A, find the first order of characteristic vector to quantize A according to the characteristic vector information EigenVector of channel matrix i
Except the code book difference, among quantization method and feedback method and the LTE under the SU-MIMO pattern feedback method identical.
First order code book uses the LTE code book in the table 2, and perhaps, first order code book uses the postrotational LTE code book of channel correlation matrix in the prior art, promptly uses
Figure GSA00000020653400151
The code book of premultiplication LTE obtains new code book, and R is a channel correlation matrix.
Step 220, the second level are fed back to the code word B among the another one code book B jPMI information.UE chooses B jThe back is by the form feedback B of PMI j, definition and the UE of code book B choose B jMethod be:
From the 2nd grade of code book B, find a code word B j, B jCan also can be through a function K (A originally as fixedly spin matrix of N*N i, B i) spin matrix obtaining, for example:
Figure GSA00000020653400152
Figure GSA00000020653400153
Expression and A iThe multiple row vector of quadrature.
This code word that UE finds out is to A iCarry out premultiplication rotation back and the most close code word B of characteristic vector EigenVector j
Step 230, A is known in the base station iAfter the information, can obtain B by the same operation of stipulating j, use B jTo A iCan obtain the higher characteristic vector information of quantified precision after being rotated.
Embodiment 3
Step 310 is determined the Rank of channel, and selects corresponding code word A from the code book of Rank correspondence i, as the 1st grade of feedback.
Such as, from the 1st grade of code book A, find the first order of characteristic vector to quantize A according to characteristic vector information EigenVector i
First order code book uses the LTE code book in the table 2, and perhaps, first order code book uses the postrotational LTE code book of channel correlation matrix in the prior art, among quantification and feedback method and the LTE under the SU-MIMO pattern feedback method identical.
Step 320 is according to A iInformation, can find some at A iThe code word that distributes constitutes code book B on every side, finds the more accurate expression code word of characteristic vector EigenVector among the middle again B.
This method is by a baseline codebook C BaseWith an A iCommon structure.For example, construct some center o equally distributed code word on every side, constitute a code book C BaseAccording to A iDetermine matrix R R premultiplication C with the relation of o BaseObtain the rotation back at A iEqually distributed on every side code word constitutes a code book B.From B, select a code word B with EigenVector quantization error minimum jQuantitative information as EigenVector.
Such as, R=HH ([1 00 0] T-U (A i)), HH represents the Household conversion, U (A i) represent A iEach element carry out an identical phase adjustment operations and make that its first element is a real number.Can obtain a R matrix like this, make o be chosen to A i
Use identical R to C BaseIn each code word carry out the operation of identical premultiplication and obtain an A iCode book B on every side selects a code word B from B jAs the quantitative information of EigenVector, and the corresponding PMI of feedback.
Step 330, the base station is according to A iInformation and the o of regulation and identical R matrix determine method, can obtain A iCode book B on every side, and find wherein code word B j, and with its final expression as characteristic vector.
Embodiment 4
Step 410 is determined the Rank of channel, and selects corresponding code word A from the code book of Rank correspondence iAs the 1st grade of feedback.
UE finds the first order of characteristic vector to quantize A from the 1st grade of code book A according to characteristic vector information EigenVector i
First order code book uses the LTE code book in the table 2, and perhaps, first order code book uses the postrotational LTE code book of channel correlation matrix in the prior art, among quantification and feedback method and the LTE under the SU-MIMO pattern feedback method identical.
Step 420 is utilized mapping relations, finds A among the C iSome corresponding code words constitute code book B, and definite coding rule.From B, find out a code word B jExpression as characteristic vector.And with the mode of PMI to B jFeed back.
Wherein, according to A iFind A among the code book C with mapping relations iSome corresponding code words, the part of formation code book B or B.B comprises and A iN the code word that chordal distance is very near.For example N can be the power value of 4,8,16 grades 2.
Step 430, base station are obtained first order feedback A iAfter, can utilize identical mapping relations to find code book B, and according to the B of identical coding rule and UE feedback jPMI information, find B jExpression as characteristic vector.
The present invention also provides a kind of system of channel information multi-level feedback, comprising:
Receiving terminal is used to feed back at least the two-stage channel indicating information to transmitting terminal;
Transmitting terminal is used for obtaining channel information according to the described channel indicating information of receiving terminal feedback.
The method that concrete receiving terminal feedback method and transmitting terminal obtain channel information repeats no more referring to method embodiment herein.
The present invention not only can solve the problem of the feedback accuracy from the Single User MIMO to the multiuser MIMO, equally also can be used for implementing to improve the feedback accuracy from the Single User MIMO to the Single User MIMO.
The present invention is by basic code book and increase progressively the mode of code book combination feedback, helps to carry out more flexibly the feedback of different stage, when improving overall quantified precision, and effective Control and Feedback expense, and guarantee maximum backwards compatibility; And senior code book can obviously reduce the computation complexity of code word based on the mode of previous stage code book information design.

Claims (14)

1. a channel information multi-level feedback method is characterized in that, comprising:
Receiving terminal feeds back at least the two-stage channel indicating information to transmitting terminal;
Transmitting terminal obtains channel information according to the described channel indicating information of receiving terminal feedback.
2. the method for claim 1 is characterized in that,
Described receiving terminal feeds back M level channel indicating information to transmitting terminal, the corresponding m level of the channel indicating information of described M＞1, the m level code book A mA code word
Figure FSA00000020653300011
M=1...M, S mExpression code book A mThe index of middle code word; Wherein, the 1st grade of code book A 1Code word can independent present channel information;
M code word of described M level code book
Figure FSA00000020653300012
Common indication one channel information is
Figure FSA00000020653300013
Ω is a function, described transmitting terminal basis
Figure FSA00000020653300014
Obtain channel information.
3. method as claimed in claim 2 is characterized in that, described Ω is one of following computing or its combination: take advantage of on premultiplication, the right side, dot product, poor and and computing.
4. as claim 2 or 3 described methods, it is characterized in that m+1 level code book A M+1Be independent of the code word of m level code book
Figure FSA00000020653300015
5. method as claimed in claim 4 is characterized in that, described m+1 level code book A M+1There is a center o M+1, described o M+1Be any matrix or vector, described A M+1Comprise or do not comprise described center o M+1, and described A M+1In remove center o M+1Outer code word and described center o M+1Distance identical.
6. the method for claim 1 is characterized in that,
Described receiving terminal feeds back M level channel indicating information to transmitting terminal, the corresponding m level of the channel indicating information of described M＞1, the m level code book A mA code word Wherein, the 1st grade of code book A 1Code word can independent present channel information, S mExpression code book A mThe index of middle code word, m+1 level code book A M+1According to m level code book A mDescribed code word
Figure FSA00000020653300017
Generate m=1...M, M＞1;
The code word of described M level code book Indicate a channel information; Described transmitting terminal is according to the code word of described M level code book
Figure FSA00000020653300019
Obtain channel information.
7. method as claimed in claim 6 is characterized in that, described m+1 level code book
Figure FSA000000206533000110
Described F is mapping relations or a functional relation, C B, mIt is a code book.
8. method as claimed in claim 7 is characterized in that, when described F is mapping relations, and described C B, mBe a fixed codebook, Corresponding C B, mIn a plurality of codeword information.
9. method as claimed in claim 7 is characterized in that, and is when described F is a functional relation, described
Figure FSA00000020653300022
C B, mIt is the code book that the code word that distributes around at a center constitutes.
10. method as claimed in claim 6 is characterized in that,
Described transmitting terminal obtains a described M code word
Figure FSA00000020653300023
Channel indicating information after, according to the channel indicating information of m level from code book A mObtain code word
Figure FSA00000020653300024
According to
Figure FSA00000020653300025
And code book A mObtain code book A M+1, when initial, according to the 1st grade of channel indicating information from code book A 1In obtain According to And code book A 1Obtain code book A 2
Obtain code book A MAfter, feed back M level channel indicating information according to receiving terminal, from code book A MIn obtain code word
Figure FSA00000020653300028
11., it is characterized in that described the 1st grade of code book A as claim 2 or 6 described methods 1Be the code book of stipulating in the long evolving system standard agreement; Perhaps, be the code book behind the code book process premultiplication matrix of stipulating in the long evolving system standard agreement, promptly
Figure FSA00000020653300029
D is the code book of stipulating in the long evolving system standard agreement, and R is a channel correlation matrix.
12. the system of a channel information multi-level feedback is characterized in that, comprising:
Receiving terminal is used to feed back at least the two-stage channel indicating information to transmitting terminal;
Transmitting terminal is used for obtaining channel information according to the described channel indicating information of receiving terminal feedback.
13. system as claimed in claim 12 is characterized in that,
Described receiving terminal is used to feed back M level channel indicating information to transmitting terminal, the corresponding m level of the channel indicating information of described M＞1, the m level code book A mA code word
Figure FSA000000206533000210
M=1...M, S mExpression code book A mThe index of middle code word; Wherein, the 1st grade of code book A 1Code word can independent present channel information;
M code word of described M level code book
Figure FSA000000206533000211
Common indication one channel information is
Figure FSA000000206533000212
Ω is a function;
Described transmitting terminal is used for basis
Figure FSA000000206533000213
Obtain channel information.
14. system as claimed in claim 12 is characterized in that,
Described receiving terminal is used to feed back M level channel indicating information to transmitting terminal, the corresponding m level of the channel indicating information of described M＞1, the m level code book A mA code word
Figure FSA000000206533000214
Wherein, the 1st grade of code book A 1Code word can independent present channel information, S mExpression code book A mThe index of middle code word, m+1 level code book A M+1According to m level code book A mDescribed code word Generate m=1...M, M＞1; The code word of described M level code book
Figure FSA00000020653300032
Indicate a channel information;
Described transmitting terminal is used for the code word according to described M level code book
Figure FSA00000020653300033
Obtain channel information.
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