CN103297180B - Information feedback device and information feedback method - Google Patents

Abstract

The embodiment of the present invention provides a kind of information feedback device and information feedback method, and described information feedback device adopts the two-stage codebook with disposable ground floor Vector Groups and multi-level second layer Vector Groups; Described information feedback device comprises: first selector, from described ground floor Vector Groups, select to approach most the primary vector of channel directional information according to the first default Signal to Interference plus Noise Ratio threshold value; Second selector, from second layer Vector Groups corresponding to described primary vector, selects to approach most the secondary vector of channel directional information according to disturbance rank order from low to high; The first calculator, calculates Signal to Interference plus Noise Ratio based on described secondary vector; Information ultramagnifier, feeds back described Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index. By the embodiment of the present invention, can simplify search procedure, realize parameter adaptive, in the time that number of users is more or less, all can reach desirable performance with less feedback.

Description

Information feedback device and information feedback method

Technical field

The present invention relates to the communications field, particularly a kind of adaptive information feedback device based on two-stage codebook andInformation feedback method.

Background technology

In the multi-user MIMO communication system based on Limited Feedback, close-to zero beam forming (ZFBF) and every userSpeed control at the tenth of the twelve Earthly Branches (PU²RC) be two kinds can practical application pre-coding scheme. ZFBF is by calculating scheduled userThe pseudoinverse of channel matrix design pre-coding matrix, can eliminate the interference between user completely. And PU²RC prelistsThe code book of code system is the fixing Orthogonal Vectors of many groups, and user is by all orthogonal vectors in search code book and calculate everySignal to Interference plus Noise Ratio (SINR, SignaltoInterferenceplusNoiseRatio) corresponding to individual vector, selects one and makesThe vector of SINR maximum, and feed back this vectorial code book sequence number and corresponding SINR. Transmitting terminal is just being organized eachFriendship vector is selected the user of one group of optimum and is calculated and capacity, and finally that group user of selection and capacity maximum carries outScheduling and precoding. For ZFBF system, code book mainly contains random vector code book (RVQ) and Jim Glassman code book(Grassmannian) etc., and for PU²RC system, code book is the set of many group orthonormal vectors.

But inventor finds that the defect of prior art is: ZFBF is more responsive to channel condition information, sendEnd need to obtain more satisfactory channel condition information just can reach reasonable performance, and therefore, ZFBF system needsLarger number of bits of feedback, number of bits of feedback is larger, and systematic function is better.

And PU²The precoding codebook of RC pre-coding scheme is limited in one group of fixing unitary matrice, and in system, SNR is lowerIn the less situation of number of users, PU²RC scheme is difficult to user's set of finding channel direction mutually orthogonal, isSystem poor-performing; And, increasing number of bits of feedback and can not improve systematic function, the increase of number of bits of feedback also simultaneouslyThe hunting zone that has expanded code book, has increased implementation complexity.

In [bibliography 5], author has proposed a kind of hybrid coding scheme, by PU²RC and ZFBF combine,Part has solved PU²Some problems in RC and ZFBF, but PU²User in RC be difficult to pairing defect stillSo exist, and in the time that Orthogonal Vectors is more, the complexity of search is higher. These fixing modes can not be fitted aboveAnswer the variation of user and channel.

List below for understanding the document that the present invention and routine techniques are useful, incorporated them into by reference hereinIn, as illustrated completely in this article.

[bibliography 1] D.J.Love, R.W.Heath, andT.Strohmer, " GrassmannianBeamformingforMultiple-InputMultiple-OutputWirelessSystems，”IEEETrans.Inform.Theory，vol.49，no.10，pp.2735-2747，2003.

[bibliography 2] Q.H.Spencer, A.LSwindlehurst, andM.Haardt, " Zero-ForcingMethodsforDownlinkSpatialMultiplexinginMulti-UserMIMOChannels，”IEEETrans.Sig.Proc.，vol.52，Feb.2004.

[bibliography 3] T.Yoo, N.Jindal, andA.GoldSmith, " Multi-antennadownlinkchannelswithlimitedfeedbackanduserselection，”IEEETransOnCommun，vol.25，no.7，pp.1478-1482，2007.

[bibliography 4] K.Huang, J.G.Andrews, andR.W.Heath, Jr, " PerformanceofOrthogonalBeamformingforSDMAwithLimitedFeedback，”IEEETrans.Veh.Tech.，vol.58，no.1，pp.152-164，Jan.2009.

[bibliography 5] K.KoandJ.Lee, " HybridCodebookDesignforMultiuserMISOSystemswithLimitedFeedback，”WCNC2010Proceedings.

[bibliography 6] S.Jung, K.KoandJ.Lee, " PerformanceofhybridcodebooktechniquesforMISOdownlinkchannelswithlimitedfeedback，”IEEEInfo.TheoryProceeding2010.

Summary of the invention

The embodiment of the present invention provides a kind of information feedback device and information feedback method, and object is: can simplify and searchRope process, and number of users more or all can reach desirable performance with less feedback when less.

According to an aspect of the present invention, provide a kind of information feedback device, be applied to user equipment side, described informationFeedback device adopts the two-stage codebook with ground floor Vector Groups and second layer Vector Groups; Described information feedback device bagDraw together:

First selector, selects from described ground floor Vector Groups Vector Groups according to the first default Signal to Interference plus Noise Ratio threshold valueApproach most the primary vector of channel directional information;

Second selector, from second layer Vector Groups corresponding to described primary vector, according to disturbance rank from low to high timeOrder selects to approach most the secondary vector of channel directional information;

The first calculator, calculates Signal to Interference plus Noise Ratio based on described secondary vector;

Information ultramagnifier, feeds back described Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index, described pre-coding matrix ropeDraw and comprise the index of primary vector and the index of secondary vector;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, the vector of described second layer Vector Groups with certificate andDistance between the vector of described ground floor Vector Groups or angular relationship and generate, the vector of described second layer Vector Groups existsNon-uniform quantizing in vector space.

According to another aspect of the present invention, provide a kind of information feedback device, be applied to base station side, described information is anti-Feedback device adopts the two-stage codebook with ground floor Vector Groups and second layer Vector Groups; Described information feedback device comprises:

Message recipient, receives Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index that subscriber equipment sends, described pre-Encoder matrix index comprises in the index of the primary vector in described ground floor Vector Groups and described second layer Vector GroupsThe index of secondary vector;

Signal transmission device, determines pre-coding matrix based on described pre-coding matrix index, and according to described pre-coding matrixCarry out signal transmission;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, the vector of described second layer Vector Groups with certificate andDistance between the vector of described ground floor Vector Groups or angular relationship and generate, and the vector of described second layer Vector GroupsNon-uniform quantizing in vector space.

According to another aspect of the present invention, provide a kind of information feedback method, be applied to user equipment side, described letterBreath feedback method adopts the two-stage codebook with ground floor Vector Groups and second layer Vector Groups; Described information feedback method bagDraw together:

From described ground floor Vector Groups Vector Groups, select to approach most channel according to the first default Signal to Interference plus Noise Ratio threshold valueThe primary vector of directional information;

From second layer Vector Groups corresponding to described primary vector, select the most approaching according to disturbance rank order from low to highThe secondary vector of channel directional information;

Calculate Signal to Interference plus Noise Ratio based on described secondary vector; And feed back described Signal to Interference plus Noise Ratio and corresponding pre-coding matrix ropeDraw, described pre-coding matrix index comprises the index of primary vector and the index of secondary vector;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, the vector of described second layer Vector Groups with certificate andDistance between the vector of described ground floor Vector Groups or angular relationship and generate, the vector of described second layer Vector Groups existsNon-uniform quantizing in vector space.

According to another aspect of the present invention, provide a kind of information feedback method, be applied to base station side, described information is anti-Feedback method adopts the two-stage codebook with ground floor Vector Groups and second layer Vector Groups; Described information feedback method comprises:

Receive Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index that subscriber equipment sends, described pre-coding matrix indexComprise the rope of the secondary vector in index and the described second layer Vector Groups of the primary vector in described ground floor Vector GroupsDraw;

Determine pre-coding matrix based on described pre-coding matrix index, and carry out signal biography according to described pre-coding matrixDefeated;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, the vector of described second layer Vector Groups with certificate andDistance between the vector of described ground floor Vector Groups or angular relationship and generate, and the vector of described second layer Vector GroupsNon-uniform quantizing in vector space.

Beneficial effect of the present invention is: converts and multistage code book disturbance by code book, can simplify search procedure,And all can reach desirable performance with less feedback in the time that number of users is more or less.

With reference to explanation and accompanying drawing hereinafter, specific implementations of the present invention is disclosed in detail, indicate of the present invention formerReason can adopted mode. Should be appreciated that, embodiments of the present invention in scope not thereby be restricted. ?In the spirit of claims and the scope of clause, embodiments of the present invention comprise many changes, revise and are equal to.

Describe and/or the feature that illustrates can be in same or similar mode one or more for a kind of embodimentIn individual other embodiment, use, combined with the feature in other embodiment, or substitute in other embodimentFeature.

Should emphasize, term " comprises/comprises " existence that refers to feature, whole, step or assembly while use herein,But do not get rid of the existence of one or more further feature, whole, step or assembly or additional.

Brief description of the drawings

Fig. 1 is the schematic diagram of Limited Feedback multi-user MIMO system;

Fig. 2 is the formation schematic diagram of the information feedback device of user equipment side in the embodiment of the present invention 1;

Fig. 3 is the formation schematic diagram of two-stage codebook in the embodiment of the present invention;

Fig. 4 is that the two-stage codebook of the embodiment of the present invention is in the principle schematic of vector space;

Fig. 5 is the formation schematic diagram of first selector in the embodiment of the present invention 1;

Fig. 6 is the formation schematic diagram of the information feedback device of base station side in the embodiment of the present invention 1;

Fig. 7 is the formation schematic diagram of the information feedback device of user equipment side in the embodiment of the present invention 2;

Fig. 8 is the formation schematic diagram of the information feedback device of base station side in the embodiment of the present invention 2;

Fig. 9 is the schematic diagram that in the embodiment of the present invention 2, the average feedback velocity of every subscriber equipment changes with number of users;

Figure 10 be in the embodiment of the present invention 2 system with capacity with number of users change a schematic diagram;

Figure 11 is another schematic diagram that in the embodiment of the present invention 2, the average feedback velocity of every subscriber equipment changes with number of users;

Figure 12 be in the embodiment of the present invention 2 system with capacity with number of users change another schematic diagram;

Figure 13 is the schematic diagram that in the embodiment of the present invention 2, the average feedback velocity of every subscriber equipment changes with Signal to Interference plus Noise Ratio;

Figure 14 be in the embodiment of the present invention 2 system with capacity with Signal to Interference plus Noise Ratio change a schematic diagram;

Figure 15 is another signal that in the embodiment of the present invention 2, the average feedback velocity of every subscriber equipment changes with Signal to Interference plus Noise RatioFigure;

Figure 16 be in the embodiment of the present invention 2 system with capacity with Signal to Interference plus Noise Ratio change another schematic diagram;

Figure 17 is the flow chart of the information feedback method of user equipment side in the embodiment of the present invention 3;

Figure 18 is the flow chart of selecting primary vector in the embodiment of the present invention 3;

Figure 19 is the another flow chart of the information feedback method of user equipment side in the embodiment of the present invention 3;

Figure 20 is the flow chart of the information feedback method of base station side in the embodiment of the present invention 3;

Figure 21 is the flow chart of the information feedback method of user equipment side in the embodiment of the present invention 4;

Figure 22 is the flow chart of the information feedback method of base station side in the embodiment of the present invention 4.

Detailed description of the invention

Below in conjunction with accompanying drawing, various embodiments of the present invention are described. These embodiments are exemplary,It not limitation of the present invention. In order to enable those skilled in the art to easily to understand principle of the present invention and enforcementMode, embodiments of the present invention describe as an example of Limited Feedback multi-user MIMO system example.

About bibliography [2] and the bibliography [3] of the ZFBF transmission method of MIMO Systems with Limited Feedback,And about the background knowledge of mixing the bibliography [6] of ZFBF and can be used as subsequent embodiment.

Fig. 1 is the schematic diagram of Limited Feedback multi-user MIMO system. As shown in Figure 1, base station is furnished with the transmitting of M rootAntenna, K user, each user has a reception antenna, and K >=M. Suppose that channel is flat Rayleigh fading letterRoad, k user's reception signal is:

y_k＝H_kx+n_kfork＝1，…，K(1)

Wherein H_k∈C^1×MRepresent that base station arrives k user's channel, n_kRepresent k user's additivity GaussWhite noise, n_k～CN(0，1)，x_k∈C^M×1For the signal that base station sends, E{||x||²}=P is total transmitting power.For simplifying the analysis, suppose that each user's average signal-to-noise ratio is identical, between each user, channel is separate. Suppose eachIn time slot, each user's receiving terminal can obtain accurately CSIR and it is quantized, by quantized result by havingA limit feedback bits is beamed back base station, and base station determines user's set of transmission and each user's precoding square according to this informationBattle array. Under the condition of distributing at constant power, have

$y_k=H_k\underset{k}{\mathrm{\Σ}}{w}_k{s}_k+n_k$ (2)

$=\sqrt{P_k}{H}_k{w}_k{s}_k+H_k\underset{j\≠k}{\mathrm{\Σ}}\sqrt{P_j}{w}_j{s}_j+n_k,k\∈(1,\·\·\·,K)$

Wherein s_kFor sending to k user's data, w_kIt is k user's pre-coding matrix.

In Limited Feedback multi-user MIMO system, ZFBF process comprises:

(A) channel directional information (CDI, ChannelDirectionInformation) quantizes feedback and channel qualityInstruction (CQI, ChannelQualityIndicator) feedback

(B) user selects transmitting terminal to be furnished with M transmit antennas, can support M user's transfer of data simultaneously,System need to select M user to carry out precoding in all K user. Exhaustive based on speed maximal criterionSearch can be found optimum user combination, but along with the increase of system antenna number and number of users, the complexity of algorithmHigher, to select in order to reduce user complexity, can adopt the semi-orthogonal user in bibliography [3] to selectAlgorithm (SUS, Semi-orthogonalUserSelection). The user class of selecting according to SUS method has higherChannel quality information can keep again the semi-orthogonal of channel direction between user.

(C) ZFBF pre-coding matrix calculates

(D) utilize pre-coding matrix to send multiple user signals.

Mix ZFBF scheme, by the disturbance to code book, reduce the quantization error of channel direction, thereby improve ZFBFThe performance of transmission. But this scheme is in the time that user is less, and PU2RC scheme has identical defect, be difficult toFind the user of coupling. If increase merely the quantity of code book, make the complexity of search increase.

The embodiment of the present invention provides a kind of ZFBF scheme based on two-stage codebook, and this scheme can be simplified codebook search mistakeJourney, realizes parameter adaptive, in the time that number of users is more or less, all can reach desirable performance with less feedback.

Embodiment 1

The embodiment of the present invention provides a kind of information feedback device, is applied to user equipment side, and this information feedback device adoptsThere is the two-stage codebook of ground floor Vector Groups and second layer Vector Groups; Wherein, between the vector of ground floor Vector Groups, keepOrthogonal, the vector foundation of second layer Vector Groups and the vectorial distance of ground floor Vector Groups or angular relationship design, secondThe vector of layer Vector Groups comprises the vectorial multistage disturbance to ground floor Vector Groups, and the vector of second layer Vector Groups is at vectorNon-uniform quantizing on space.

Fig. 2 is the formation schematic diagram of the information feedback device of embodiment of the present invention user equipment side. As shown in Figure 2, shouldInformation feedback device comprises: first selector 201, second selector 202, the first calculator 203 and information feedbackDevice 204.

Wherein, the first Signal to Interference plus Noise Ratio threshold value that first selector 201 bases are preset is from ground floor Vector Groups Vector GroupsSelect to approach most the primary vector of channel directional information; Second selector 202 from the second layer corresponding to this primary vector toIn amount group, select to approach most the secondary vector of channel directional information according to disturbance rank order from low to high; First calculatesDevice 203 calculates Signal to Interference plus Noise Ratio based on this secondary vector; Information ultramagnifier 204 feeds back the pre-of these Signal to Interference plus Noise Ratio and correspondenceEncoder matrix index, this pre-coding matrix index comprises the index of primary vector and the index of secondary vector.

In the specific implementation, ground floor Vector Groups can comprise multiple orthonormal vector groups, and second layer Vector Groups adoptsRandom vector is carried out disturbance within the specific limits to the each orthonormal vector in ground floor Vector Groups. Can adopt the tenth of the twelve Earthly BranchesThe method that matrix and random vector code book combine designs precoding codebook.

First first order code book (ground floor Vector Groups) can adopt a M × M to tie up unitary matrice, can be one withMachine produces unitary matrice, the unitary matrice that also can search out according to channel statistic by Lloyd algorithm.

The method that the design of second level code book (second layer Vector Groups) can adopt random vector to quantize, the described second layerVector in Vector Groups (can referred to as ground floor vector) T_m，i，l(can be called for short with the vector in described ground floor Vector GroupsFor second layer vector) V_mCan meet following relation:

$\sqrt{1-\left|V_m^H{T}_{m,i,l}\right|}\≤{\mathrm{\ϵ}}_i---\left(3\right)$

Wherein, m represents the sequence number of ground floor vector, 1≤m≤M, M is the number of ground floor vector, M and send outAntennas number equates; I represents the grade of disturbance, 1≤i≤I; L be in each grade disturbance corresponding 1 ground floor toThe sequence number of the second layer vector of amount, 1≤l≤L; ε_iThe thresholding of i level disturbance, 0 < ε₁＜…＜ε_I＜1。

In the present embodiment, disturbance thresholding ε is the compromise of quantified precision and coverage. If it is larger that ε arranges, thisThe final code book of sample, just close to being uniformly distributed, in fact deteriorates to random vector code book, like this in the time that number of users is more,Just can not embody the superiority of second level code book design. Fig. 3 has provided the rough schematic of two-stage codebook, and Fig. 4 is rightOne-level codebook vectors is carried out the schematic diagram of secondary disturbance.

It should be noted that and only two-stage codebook is schematically illustrated above. Two-stage codebook of the present invention is at vectorOn space, non-uniform quantizing is not limited in above-mentioned concrete embodiment. Non-uniform quantizing according to being secondary vector sumDistance relation between one-level vector, the distance between unit vector generally has chordal distance, projector distance, angle (to throwThe arcsin function of shadow distance) etc. representation.

Therefore, those of ordinary skill in the art can carry out suitable change to expression formula (3) according to above-mentioned thinkingType or conversion, can determine concrete embodiment as the case may be. And as long as in two-stage codebook, second layer vectorThe non-homogeneous multistage disturbance to ground floor vector, all should be within the scope of the present invention.

In the present embodiment, first selector 201 can be selected primary vector based on following principle:

$m^{*}=\arg \underset{1<m<M}{\max }\left|h_k^H{v}_m\right|---\left(4\right)$

Wherein, v_mFor the precoding vector in the unitary matrice of first order code book,Represent channel CDI; User canSelect a vector nearest with channel CDI in precoding vector, and obtain the sequence number m of this vector correspondence^*。

Further, first selector 201 can be selected according to default Signal to Interference plus Noise Ratio threshold value, selects letter dryMake an uproar than the primary vector that is greater than threshold value, can there is thus better performance.

Fig. 5 is the formation schematic diagram of first selector in the embodiment of the present invention. As shown in Figure 5, this first selector toolBody can comprise: third selector 501, the second calculator 502, the first determining device 503 and the first converter 504.

Wherein, third selector 501 selects to approach most the primary vector of channel directional information from ground floor Vector Groups;The primary vector that the second calculator 502 is selected according to third selector 501 calculates Signal to Interference plus Noise Ratio; The first determining device 503Judge whether the Signal to Interference plus Noise Ratio that the second calculator 502 calculates is less than the first Signal to Interference plus Noise Ratio threshold value; The first converter504 judged results at the first determining device 503 when being less than the first Signal to Interference plus Noise Ratio threshold value, are entered ground floor Vector GroupsRow orthogonal transformation; And third selector 501 is also selected to connect most for the ground floor Vector Groups from orthogonal transformationThe primary vector of Adjacent Channel directional information.

In the specific implementation, can be less than the first given Signal to Interference plus Noise Ratio at the Signal to Interference plus Noise Ratio going out according to selected vector calculationWhen threshold value, ground floor Vector Groups is carried out to orthogonal transformation, then carry out vector selection and Signal to Interference plus Noise Ratio calculating, so enterRow is until the Signal to Interference plus Noise Ratio of selected vector is greater than the first Signal to Interference plus Noise Ratio threshold value; If after maximum number of transitions, letter is dryMake an uproar than still not reaching the first Signal to Interference plus Noise Ratio threshold value, subscriber equipment no longer carries out later step.

Further, this information feedback device can also comprise: the second converter (not shown). This second changeParallel operation, according to the rule of making an appointment between base station and subscriber equipment, carries out ground floor Vector Groups and second layer Vector GroupsConversion.

Thus, can, by the entirety of ground floor Vector Groups and second layer Vector Groups, arrange according to base station and subscriber equipmentRule converts. Can carry out integral transformation, for example matrixing to Vector Groups. Can produce thus new two-stageCode book carrys out the variation of adaptive channel, further improves systematic function.

Wherein, integral transformation can be that the vector of the vector sum second layer Vector Groups of ground floor Vector Groups adopts identical ruleConversion, such as with same Matrix Multiplication with all vectors. But be not limited to this, can determine tool according to actual conditionsThe embodiment of body.

The precoding vector of selected first order code book of second selector 202 bases, can be at this precoding vectorBasis on select the precoding vector of second level code book according to following principle:

$l^{*}=\arg \underset{1<l<L}{\max }\left|h_k^H{T}_{m,i,l}\right|---\left(5\right)$

Thus, can obtain the precoding vector of second level code book, and obtain the sequence number l of this vector correspondence^*. Enter oneWalk ground, can select approach most according to disturbance rank order from low to high the secondary vector of channel directional information, for example logicalCross foregoing ε_i; Can realize thus multi-stage codebooks disturbance.

In the specific implementation, can calculate the first Signal to Interference plus Noise Ratio according to following formula. Wherein, k user's SINR₁Can be calculated by following formula:

${\mathrm{SINR}}_{k,1}=\frac{\frac{p}{M}\left|\right|h_k^H{v}_{m^{*}}\left|\right|}{1+\frac{p}{M}(1-|\left|h_k^H{v}_{m^{*}}\right|\left|\right)}---\left(6\right)$

According to bibliography [6], can be calculated as follows the second Signal to Interference plus Noise Ratio. Wherein, k user's SINR₂Can be calculated by following formula:

${\mathrm{SINR}}_{k,2}=\frac{\frac{p}{M}{\left|\right|h_k\left|\right|}^2{\cos \mathrm{\&theta;}}_k^2(1-\frac{M-1}{M}{\mathrm{\&epsiv;}}_i^2)}{1+\frac{p}{M}{\left|\right|h_k\left|\right|}^2{\sin \mathrm{\&theta;}}_k^2}---\left(7\right)$

Wherein: ${\cos \mathrm{\&theta;}}_k=\left|h_k^H{T}_{m^{*},i,l^{*}}\right|$

If the first Signal to Interference plus Noise Ratio does not reach the first Signal to Interference plus Noise Ratio threshold value, Vector Groups is converted, then carry out toAmount is selected and Signal to Interference plus Noise Ratio calculates, until choose primary vector; Then, to carrying out secondary vector choosing by primary vectorSelect, if the second Signal to Interference plus Noise Ratio does not reach the second Signal to Interference plus Noise Ratio threshold value, can increase disturbance rank, then carry out toAmount is selected and Signal to Interference plus Noise Ratio calculates.

Information ultramagnifier 204 can send to base station by the pre-coding matrix index of acquisition and Signal to Interference plus Noise Ratio. This precodingMatrix index comprises the index of primary vector and the index of secondary vector. Pre-coding matrix index can also comprise conversion timeNumber, disturbance rank i^*。

Thus, in the specific implementation, can be by number of transitions, one-level vector sequence number m^*, disturbance rank i^*, secondaryVector sequence number l^*With corresponding SINR_k,2Feed back to base station. Each subscriber equipment is feeding back precoding matrix rope separatelyDraw and corresponding Signal to Interference plus Noise Ratio.

In the present embodiment, and PU²The codebook search process of RC is also different: PU²RC need to search for many group codes originallyEach vector to determine best code book, and the present invention first searches for first order code book, obtain best code book itAfter, then search for second level code book that should first order code book, the workload of search reduces greatly.

The embodiment of the present invention also provides a kind of information feedback device, is applied to base station side, and this information feedback device adopts toolThere is the two-stage codebook of ground floor Vector Groups and second layer Vector Groups; Wherein, between the vector of described ground floor Vector Groups, protectHold orthogonally, the distance of second layer vector foundation and ground floor vector or angular relationship design comprise many to ground floor vectorLevel disturbance, the vector of second layer Vector Groups non-uniform quantizing in vector space. The content identical with user equipment side,Repeat no more herein.

Fig. 6 is the formation schematic diagram of the information feedback device of embodiment of the present invention base station side. As shown in Figure 6, this informationFeedback device comprises: message recipient 601 and signal transmission device 602.

Wherein, message recipient 601 receives Signal to Interference plus Noise Ratio and the corresponding pre-coding matrix rope that subscriber equipment sendsDraw; Signal transmission device 602 is determined pre-coding matrix based on this pre-coding matrix index, and according to definite precoding squareBattle array is carried out signal transmission.

Wherein, pre-coding matrix index comprises the index of primary vector and the index of secondary vector; In addition precoding square,Battle array index can also comprise the information such as number of transitions, disturbance rank. But be not limited to this, can determine tool according to actual conditionsThe information of body.

In the present embodiment, subscriber equipment can be multiple; This information feedback device can also comprise: device selector(not shown). This device selector can be selected one or more subscriber equipmenies according to Signal to Interference plus Noise Ratio; And,One or more subscriber equipmenies that signal transmission device 602 can also be used for selecting carry out signal transmission.

Particularly, base station side can be according to the feedback information of subscriber equipment, all Vector Groups number of transitions and one-level toMeasure the subscriber equipment of selecting a SINR maximum in the subscriber equipment that sequence number is identical. According to SINR or maximum capacityCriterion composition MU-MIMO user is to (with the user's scheduling in PU2RC method). Base station end can select firstThe mutually orthogonal subscriber equipment of level code book, adopts ZFBF method to calculate precoding square according to their second level code bookBattle array.

It should be noted that above formula is only that the present invention has been carried out to schematic explanation, but be not limited to this. AbilityThe technical staff in territory can suitably convert formula, can determine concrete embodiment according to actual conditions.

From above-described embodiment, convert and multistage code book disturbance by code book, can simplify search procedure, andIn the time that number of users is more or less, all can reach desirable performance with less feedback.

Embodiment 2

The embodiment of the present invention is on the basis of embodiment 1, and the ZFBF scheme based on two-stage codebook is carried out adaptive scheduling,Can further reduce the number of bits of feedback of system, Hoisting System performance.

The embodiment of the present invention provides a kind of information feedback device, is applied to user equipment side, and this information feedback device adoptsThere is the two-stage codebook of ground floor Vector Groups and second layer Vector Groups; Wherein, between the vector of ground floor Vector Groups, keepOrthogonal, the vector foundation of second layer Vector Groups and the vectorial distance of ground floor Vector Groups or angular relationship design, and theThe vector of two layers of Vector Groups non-uniform quantizing in vector space. For each subscriber equipment, this two-stage codebook can beMultiple.

Fig. 7 is the formation schematic diagram of the information feedback device of embodiment of the present invention user equipment side. As shown in Figure 7, shouldInformation feedback device comprises: first selector 701, second selector 702, the first calculator 703 and information feedbackDevice 704. As described in Example 1, repeat no more herein.

As shown in Figure 7, this information feedback device can also comprise: the second determining device 705 and codebook selecting device 706;Wherein, the second determining device 705 judges whether Signal to Interference plus Noise Ratio that this first calculator 703 calculates is greater than default secondSignal to Interference plus Noise Ratio threshold value; Codebook selecting device 706 is judged Signal to Interference plus Noise Ratio at the second determining device 705 and is not more than this second letterDry while making an uproar than threshold value, select another two-stage codebook to recalculate Signal to Interference plus Noise Ratio; And, information ultramagnifier 704Also when be greater than described this second Signal to Interference plus Noise Ratio threshold value at Signal to Interference plus Noise Ratio, feed back this Signal to Interference plus Noise Ratio and corresponding pre-Encoder matrix index.

Further, as shown in Figure 7, this information feedback device can also comprise: instruction receiver 707; Instruction connectsReceive device 707 and receive the instruction of feedback again that base station sends; And codebook selecting device 706 is also for connecing according to instructionReceive the instruction that device 707 receives, select another two-stage codebook to recalculate Signal to Interference plus Noise Ratio.

The embodiment of the present invention also provides a kind of information feedback device, is applied to base station side, and this information feedback device adopts toolThere is the two-stage codebook of ground floor Vector Groups and second layer Vector Groups; Wherein, between the vector of ground floor Vector Groups, just keepingHand over, the vector of second layer Vector Groups generates with the distance between certificate and the vector of ground floor Vector Groups or angular relationship,And the vector of second layer Vector Groups non-uniform quantizing in vector space. Subscriber equipment is multiple, and each subscriber equipment is adoptedUse multiple two-stage codebooks.

Fig. 8 is the formation schematic diagram of the information feedback device of embodiment of the present invention base station side. As shown in Figure 8, this informationFeedback device comprises: message recipient 801 and signal transmission device 802. As described in Example 1, repeat no more herein.

As shown in Figure 8, this information feedback device can also comprise the 3rd determining device 803 and indicator-transmitter 804; ItsIn, the 3rd determining device 803 judges whether that the subscriber equipment of predetermined quantity adopts identical two-stage codebook calculating and sending to sendSignal to Interference plus Noise Ratio and corresponding pre-coding matrix index; Indicator-transmitter 804 is for sentencing at the 3rd determining device 803When disconnected result is no, send the instruction of feedback again, equipment for indicating user selects another two-stage codebook to recalculate letterThe dry ratio of making an uproar; And, signal transmission device 802 also in the judged result of the 3rd determining device 803 when being, adopting shouldIdentical two-stage codebook carries out signal transmission to the subscriber equipment of this predetermined quantity.

Below taking the ZFBF scheme that combines based on unitary matrice and random vector code book as example, to this adaptive scheduling sideCase is elaborated. Wherein, the first order codebook structure in two-stage codebook adopts many group orthogonal vectors, second level codeThis for example adopts formula (3) to design, and each orthogonal vectors of each group are carried out to disturbance within the specific limits.This scheme can change according to subscriber channel information self-adapting the characteristic direction of initial unitary matrice, makes itself and user's channelDirection is as far as possible consistent, and the user who chooses selects more accurate in the certain orthogonality of maintenance in the code book of the second levelTrue quantized channel information is carried out beam forming.

Particularly, subscriber equipment end group is in initial two-stage codebook, first M standard of first order code book orthogonal toIn amount, search for best vector, then, in the range of disturbance of these orthogonal vectors, in the vector of second level code book, selectBest beam forming vector, and can calculate SINR according to formula (7). If the best that subscriber equipment is selected prelistsThe SINR that code vector is corresponding is greater than the SINR threshold value of default, and this subscriber equipment is by this best precodingThe code word sequence number of vector and corresponding SINR feed back to base station; If the SINR of the best precoding vector of selecting is less thanThe SINR threshold value of system, selects another two-stage codebook, in this code book, searches for according to above-mentioned rule,Selection has the quantification CDI code word sequence number of maximum SINR. Can be until all two-stage codebooks of limit, if nowMaximum SINR is still less than thresholding, and this subscriber equipment can not feed back any information.

And base station end can decide and adopt which code book to carry out precoding according to feedback information. If what feed backIn information, can complete the distribution of resource for initial codebook, can in all subscriber equipmenies that feed back informationFind the subscriber equipment of M qualified nearly orthogonal, adopt initial codebook to carry out the subscriber equipment of selectingZF precoding is calculated. Distribute if can not complete resource, can be using another two-stage codebook as current precodingCode book; Can send the instruction of feedback again, equipment for indicating user is selected another two-stage codebook.

Subscriber equipment receives after this instruction of again feeding back, can be based on this another two-stage codebook according to above-mentioned stepsSearch for and calculate SINR, if the SINR of the best precoding vector of selecting is less than the SINR threshold value of system,In next group vector, search for according to above-mentioned rule, select to have the quantification CDI code word sequence number of maximum SINR,If now maximum SINR is still less than thresholding, this subscriber equipment can not feed back any information.

And base station end can carry out resource distribution and adjust pre-coding matrix notifying user equipment according to above-mentioned steps. DirectlyTo the subscriber equipment that finds M qualified nearly orthogonal.

In addition, if through certain number of times repeatedly, until transform to after last two-stage codebook, still can not be by MIndividual vector dispenses completely, and base station end can also the allocation result when distributing maximum code book in assigning process above be doneFor optimum, using corresponding two-stage codebook as current code book, the user that wherein part vector fractional integration series dispensing is corresponding is establishedStandby.

Below the adaptive pre-encoding scheme based on two-stage codebook is carried out to simulation analysis, emulation is based on following hypothesis: baseThe end of standing is furnished with 4 transmit antennas, and every user is furnished with a reception antenna, adopts QPSK modulation. In adaptation schemeOne-level code book adopt DFT code book. As Performance Ratio PU²The code book of RC pre-coding scheme also adopts DFTCode book.

Fig. 9,10 is anti-to the self adaptation based on two-stage codebook in the time of P=5dB during for the different SINR thresholding of defaultFeedback scheme (AHBF) has been carried out emulation, while and PU²The ZFBF based on two-stage codebook in RC and embodiment 2(HBF) compare.

Can find out, in the time of the different SINR thresholding of default, when number of users reaches certain number, averageNumber of bits of feedback has the reduction of different amplitudes. As seen from Figure 9, in the time that SINR threshold value is higher, number of usersPoor performance when less, this is because if number of users is less, it is excessive that SINR thresholding arranges, and finds and meet the requirementsThe probability of user set very low, base station can not complete resource and distribute. So system should arrange and close in this caseSuitable SINR threshold value could Hoisting System performance.

Figure 11, Figure 12 during for the different SINR thresholding of default in the time of P=25dB to based on two-stage codebook fromAdapt to feedback scheme and carried out emulation. Can find out, the in the situation that of large transmitting power, it is certain that system user number reachesWhen value, the every user's of system average feedback velocity has the decline of different amplitudes in the time that system arranges different SINR thresholding.As seen from Figure 12, under different SINR thresholdings, adaptation scheme is compared with PU²RC scheme and two-stage codebook ZFBFScheme with volumetric properties on all promote to some extent, be different from the situation of little transmitting power, when transmitting power is larger, userThe satisfactory user of end SINR increases, even if also may find satisfactory use in the situation that number of users is lessScheduling of resource is carried out in family set.

Figure 13, Figure 14, Figure 15 and Figure 16 be and situation pair that number of users more less for number of users in system respectivelySystematic function has been carried out emulation with the variation of SNR.

Can be found out by Figure 13 and Figure 14, improve SINR threshold value and can further reduce the average feedback ratio of every userSpecial number. Under different SINR thresholdings, number of bits of feedback all along with SNR increase and increase because SNR is lowerTime, the user of SINR threshold value who meets default is less, and along with SNR increases, system finds and meets the requirementsThe probability of user set increase.

Can be found out by Figure 15 and Figure 16, SNR ratio reaches certain value, and self adaptation feedback scheme is at different SINRUnder thresholding, all show good performance, and also the increasing along with the increase of SINR with capacity of system. ButWhen SNR is lower, if larger SINR thresholding is set, system is difficult to find the user's set that meets SINR requirementComplete resource and distribute, cause systematic function to decline. So in the time that SNR is lower, suitable SINR door is setLimit value just can obtain the lifting in performance.

Embodiment 3

A kind of information feedback method of the embodiment of the present invention, is applied to user equipment side, the content identical with embodiment 1,Repeat no more herein. This information feedback method adopts the two-stage codebook with ground floor Vector Groups and second layer Vector Groups,Wherein, between the vector of ground floor Vector Groups, keep orthogonal, the vector foundation of second layer Vector Groups and ground floor Vector GroupsVectorial distance or angular relationship design, the vector of second layer Vector Groups comprises vectorial many to ground floor Vector GroupsLevel disturbance, the vector of second layer Vector Groups non-uniform quantizing in vector space.

Figure 17 is the flow chart of the information feedback method of embodiment of the present invention user equipment side. As shown in figure 17, this letterBreath feedback method comprises:

Step 1701, the first Signal to Interference plus Noise Ratio threshold value that subscriber equipment basis is preset is from ground floor Vector Groups Vector GroupsSelect to approach most the primary vector of channel directional information;

Step 1702, subscriber equipment is from second layer Vector Groups corresponding to primary vector, according to disturbance rank from low to highOrder select to approach most the secondary vector of channel directional information;

Step 1703, subscriber equipment calculates Signal to Interference plus Noise Ratio based on this secondary vector; And feed back this Signal to Interference plus Noise Ratio and rightThe pre-coding matrix index of answering, this pre-coding matrix index comprises the index of primary vector and the index of secondary vector.

In the specific implementation, step 1701 can also be calculated Signal to Interference plus Noise Ratio and select primary vector. Figure 18 is the present inventionThe flow chart of the selection primary vector of embodiment, as shown in figure 18, this selection step can comprise:

Step 1801, from ground floor Vector Groups, selection approaches the primary vector of channel directional information most;

Step 1802, calculates Signal to Interference plus Noise Ratio according to the primary vector of selecting;

Step 1803, whether the Signal to Interference plus Noise Ratio that judgement calculates is less than the first Signal to Interference plus Noise Ratio threshold value; If be less than firstSignal to Interference plus Noise Ratio threshold value, performs step 1804, otherwise execution step 1805;

Step 1804,, ground floor Vector Groups is carried out to orthogonal transformation; And again perform step after orthogonal transformation1801, in the ground floor Vector Groups from orthogonal transformation, selection approaches the primary vector of channel directional information most;

Step 1805, determines this primary vector.

Above-mentioned steps 801 to step 804 can repeatedly be carried out, and does until the Signal to Interference plus Noise Ratio of selected vector is greater than the first letterMake an uproar and compare threshold value; If after maximum number of transitions, Signal to Interference plus Noise Ratio does not still reach the first Signal to Interference plus Noise Ratio threshold value,Subscriber equipment no longer carries out later step.

Figure 19 is the another flow chart of the information feedback method of embodiment of the present invention user equipment side. As shown in figure 19,This information feedback method comprises:

Step 1901, subscriber equipment selects to approach most channel directional information from the ground floor Vector Groups of two-stage codebookPrimary vector;

Step 1902, subscriber equipment is according to selected ground floor vector calculation Signal to Interference plus Noise Ratio; If result is greater thanOne Signal to Interference plus Noise Ratio threshold value, enters step 1905, otherwise enters step 1903;

Step 1903, judges whether vector transformation number of times reaches the maximum number of times that limits; If reached maximum,Enter step 1910 and finish, otherwise enter step 1904;

Step 1904, converts according to the rule of base station and subscriber equipment agreement Vector Groups entirety, then returnsStep 1901;

Wherein, integral transformation can be that the vector of the vector sum second layer Vector Groups of ground floor Vector Groups adopts identical ruleConvert, such as with same Matrix Multiplication with all vectors. But be not limited to this, can be true according to actual conditionsFixed concrete embodiment.

Step 1905, subscriber equipment, from second layer Vector Groups corresponding to this primary vector, selects to approach most channel sideTo the secondary vector of information;

Step 1906, subscriber equipment calculates Signal to Interference plus Noise Ratio based on this secondary vector; If result is greater than, the second letter is dry makes an uproarThan threshold value, enter step 1909, otherwise enter step 1907;

Step 1907, judges whether to reach maximum perturbation rank; If reached the maximum of disturbance rank, enteredEnter step 1910 and finish, otherwise enter step 1908;

Step 1908, increases disturbance rank, then returns to step 1905;

Step 1909, feeds back this Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index.

In the present embodiment, ground floor Vector Groups can comprise multiple orthonormal vectors, second layer Vector Groups adopt withMachine vector carries out disturbance within the specific limits to the each orthonormal vector in ground floor Vector Groups.

The embodiment of the present invention also provides a kind of information feedback method, is applied to base station side. This information feedback method adopts toolThere is the two-stage codebook of ground floor Vector Groups and second layer Vector Groups; Wherein, between the vector of ground floor Vector Groups, just keepingHand over, the vector of second layer Vector Groups generates with the distance between certificate and the vector of ground floor Vector Groups or angular relationship,And the vector of second layer Vector Groups non-uniform quantizing in vector space.

Figure 20 is the flow chart of the information feedback method of embodiment of the present invention base station side. As shown in figure 20, this information is anti-Feedback method comprises:

Step 2001, base station receives Signal to Interference plus Noise Ratio and the corresponding pre-coding matrix index that subscriber equipment sends, shouldPre-coding matrix index comprise second in the index of the primary vector in ground floor Vector Groups and second layer Vector Groups toThe index of amount;

Step 2002, pre-coding matrix is determined based on this pre-coding matrix index in base station, and according to this pre-coding matrixCarry out signal transmission;

In the present embodiment, subscriber equipment can be multiple; This information feedback method can also comprise: according to dry the making an uproar of letterThan selecting one or more subscriber equipmenies; And, one or more subscriber equipmenies of this selection are carried out to signal transmission.

From above-described embodiment, by the two-stage codebook of non-uniform quantizing in vector space, can simplify and search forJourney, and can reach good performance by less number of bits of feedback in the situation that number of users is more.

Embodiment 4

A kind of information feedback method of the embodiment of the present invention, is applied to user equipment side, the content identical with embodiment 2,Repeat no more herein. This information feedback method adopts the two-stage codebook with ground floor Vector Groups and second layer Vector Groups;Wherein, between the vector of ground floor Vector Groups, keep orthogonal, the vector of second layer Vector Groups is with certificate and ground floor Vector GroupsVector between distance or angular relationship and generating, and the vector of second layer Vector Groups non-homogeneous amount in vector spaceChange. The two-stage codebook that each subscriber equipment is corresponding is multiple.

Figure 21 is the flow chart of the information feedback method of embodiment of the present invention user equipment side. As shown in figure 21, this letterBreath feedback method comprises:

Step 2101, the first Signal to Interference plus Noise Ratio threshold value that subscriber equipment basis is preset is from ground floor Vector Groups Vector GroupsSelect to approach most the primary vector of channel directional information;

Step 2102, subscriber equipment is from second layer Vector Groups corresponding to primary vector, according to disturbance rank from low to highOrder select to approach most the secondary vector of channel directional information;

Step 2103, subscriber equipment calculates Signal to Interference plus Noise Ratio based on this secondary vector;

Step 2104, judges whether Signal to Interference plus Noise Ratio is greater than the second default Signal to Interference plus Noise Ratio threshold value; At Signal to Interference plus Noise Ratio notWhile being greater than this second Signal to Interference plus Noise Ratio threshold value, execution step 2106; Be greater than this second Signal to Interference plus Noise Ratio door at Signal to Interference plus Noise RatioWhen limit value, execution step 2105;

Step 2105, subscriber equipment feedback Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index, this pre-coding matrixIndex comprises the index of primary vector and the index of secondary vector;

Step 2106, subscriber equipment is selected another two-stage codebook, and execution step 2101 is to recalculate Signal to Interference plus Noise Ratio.

Further, after calculating Signal to Interference plus Noise Ratio based on described secondary vector, described information feedback method can also wrapDraw together:

Step 2107, subscriber equipment receives the instruction of feedback again that base station sends;

And, after this instruction of again feeding back receiving, can also perform step 2106 selections another twoLevel code book recalculates Signal to Interference plus Noise Ratio.

A kind of information feedback method of the embodiment of the present invention, is applied to base station side. This information feedback method adopts has firstThe two-stage codebook of layer Vector Groups and second layer Vector Groups; Wherein, between the vector of ground floor Vector Groups, keep orthogonal, theThe vector of two layers of Vector Groups generates with the distance between certificate and the vector of ground floor Vector Groups or angular relationship, and secondVector non-uniform quantizing in vector space of layer Vector Groups. Subscriber equipment is multiple, and each subscriber equipment adopts multipleTwo-stage codebook.

Figure 22 is the flow chart of the information feedback method of embodiment of the present invention base station side. As shown in figure 22, this information is anti-Feedback method comprises:

Step 2201, base station receives Signal to Interference plus Noise Ratio and the corresponding pre-coding matrix index that subscriber equipment sends, shouldPre-coding matrix index comprises the index of primary vector and the index of secondary vector;

Step 2202, base station judges whether that the subscriber equipment of predetermined quantity adopts identical two-stage codebook calculating and sendingSignal to Interference plus Noise Ratio and corresponding pre-coding matrix index are sent; If the determination result is YES, perform step 2203; IfJudged result is no, performs step 2204;

Step 2203, base station adopts this identical two-stage codebook to carry out signal transmission to the subscriber equipment of this predetermined quantity;

For each subscriber equipment, precoding square can be determined by the pre-coding matrix index based on this subscriber equipment in base stationBattle array, and carry out signal transmission according to this pre-coding matrix.

Step 2204, base station sends the instruction of feedback again, and equipment for indicating user is selected another two-stage codebook againCalculate Signal to Interference plus Noise Ratio.

From above-described embodiment, by the two-stage codebook of non-uniform quantizing in vector space, can simplify and search forJourney, and can reach good performance by less number of bits of feedback in the situation that number of users is more. And, fromAdapt to average number of bits of feedback that pre-coding scheme can make every subscriber equipment in the time that system user number is more significantly underFall, by rational systematic parameter is set, can obtain preferably and rate capability.

Apparatus and method more than the present invention can be realized by hardware, also can be realized by combination of hardware software. The present inventionRelate to such computer-readable program, in the time that this program is performed by logical block, can make this logical block realizeDevice mentioned above or component parts, or make this logical block realize the whole bag of tricks mentioned above or step. ThisThe bright storage medium also relating to for storing above program, as hard disk, disk, CD, DVD, flash memoryDeng.

In conjunction with concrete embodiment, invention has been described above, but it will be apparent to those skilled in the art that thisA little descriptions are all exemplary, are not limiting the scope of the invention. Those skilled in the art can be according to thisSpirit and the principle of invention are made various variants and modifications to the present invention, and these variants and modifications are also in scope of the present inventionIn.

About the embodiment that comprises above embodiment, following remarks is also disclosed:

(remarks 1) a kind of information feedback device, is applied to user equipment side, and described information feedback device adopts to be hadThe two-stage codebook of disposable ground floor Vector Groups and multi-level second layer Vector Groups; Described information feedback device bagDraw together:

First selector according to the first default Signal to Interference plus Noise Ratio threshold value, is selected to connect most from described ground floor Vector GroupsThe primary vector of Adjacent Channel directional information;

Second selector, from second layer Vector Groups corresponding to described primary vector, according to disturbance rank from low to high timeOrder selects to approach most the secondary vector of channel directional information;

The first calculator, calculates Signal to Interference plus Noise Ratio based on described secondary vector;

Information ultramagnifier, the Signal to Interference plus Noise Ratio that feedback is described and corresponding pre-coding matrix index, this pre-coding matrix ropeDraw and comprise the index of primary vector and the index of secondary vector;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, the vector of described second layer Vector Groups with certificate andDistance between the vector of described ground floor Vector Groups or angular relationship and generate, the vector of described second layer Vector Groups existsNon-uniform quantizing in vector space.

(remarks 2), according to the information feedback device described in remarks 1, wherein, described ground floor Vector Groups comprises multipleOrthonormal vector, the vector of described second layer Vector Groups is to adopt every in described ground floor Vector Groups of random vectorIndividual orthonormal vector carries out the vector after disturbance.

(remarks 3) according to the information feedback device described in remarks 2, wherein, and the vector in described second layer Vector GroupsT_m，i，lWith the vectorial V in described ground floor Vector Groups_mMeet following relation:

$\sqrt{1-\left|V_m^H{T}_{m,i,l}\right|}\&le;{\mathrm{\&epsiv;}}_i$

Wherein, m represents the sequence number of vector in ground floor Vector Groups, 1≤m≤M, and M is described ground floor Vector GroupsThe number of middle vector, the quantity of M and transmitting antenna equates; I represents described disturbance rank, and 1≤i≤I, described in I isThe maximum of disturbance rank; L is in each disturbance rank in corresponding described ground floor Vector Groups one vectorial describedIn two layers of Vector Groups vector sequence number, 1≤l≤L, in the corresponding described ground floor Vector Groups of L one vectorial described inThe number of vector in second layer Vector Groups; ε_iThe threshold value of i level disturbance rank, 0 < ε₁＜…＜ε_I＜1。

(remarks 4), according to the information feedback device described in remarks 1, wherein, described first selector specifically comprises:

Third selector, from described ground floor Vector Groups, selection approaches the primary vector of channel directional information most;

The second calculator, the described primary vector of selecting according to described third selector calculates Signal to Interference plus Noise Ratio;

The first determining device, judges whether the Signal to Interference plus Noise Ratio that described the second calculator calculates is less than described the first Signal to Interference plus Noise RatioThreshold value;

The first converter, in the judged result of described the first determining device when being less than described the first Signal to Interference plus Noise Ratio threshold value,Described ground floor Vector Groups is carried out to orthogonal transformation;

And described third selector also selects to approach most channel side for the ground floor Vector Groups from orthogonal transformationTo the primary vector of information.

(remarks 5), according to the information feedback device described in remarks 1, wherein, described information feedback device also comprises:

The second converter, according to the rule of making an appointment between base station and subscriber equipment, to described ground floor Vector Groups andDescribed second layer Vector Groups converts.

(remarks 6), according to the information feedback device described in remarks 1 to 3 any one, wherein, described two-stage codebook isMultiple, described information feedback device also comprises:

The second determining device, judges whether the Signal to Interference plus Noise Ratio that described the first calculator calculates is greater than default dry the making an uproar of the second letterCompare threshold value;

Codebook selecting device, judges described Signal to Interference plus Noise Ratio at described the second determining device and is not more than described the second Signal to Interference plus Noise Ratio doorWhen limit value, select another two-stage codebook to recalculate Signal to Interference plus Noise Ratio;

And described information ultramagnifier is also greater than described for judge described Signal to Interference plus Noise Ratio at described the second determining deviceWhen two Signal to Interference plus Noise Ratio threshold values, feed back described Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index.

(remarks 7), according to the information feedback device described in remarks 6, wherein, described information feedback device also comprises:

Instruction receiver, receives the instruction of feedback again that base station sends;

And described codebook selecting device is the instruction for receiving according to described instruction receiver also, select another twoLevel code book recalculates Signal to Interference plus Noise Ratio.

(remarks 8) a kind of information feedback device, is applied to base station side, and described information feedback device adopts has firstThe two-stage codebook of layer Vector Groups and second layer Vector Groups; Described information feedback device comprises:

Message recipient, receives the Signal to Interference plus Noise Ratio that subscriber equipment sends, and corresponding pre-coding matrix index, and this is pre-Encoder matrix index comprises in the index of the primary vector in described ground floor Vector Groups and described second layer Vector GroupsThe index of secondary vector;

Signal transmission device, determines pre-coding matrix based on described pre-coding matrix index, and according to described pre-coding matrixCarry out signal transmission;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, the vector of described second layer Vector Groups with certificate andDistance between the vector of described ground floor Vector Groups or angular relationship and generate, and the vector of described second layer Vector GroupsNon-uniform quantizing in vector space.

(remarks 9), according to the information feedback device described in remarks 8, wherein, described ground floor Vector Groups comprises multipleOrthonormal vector, the vector of described second layer Vector Groups is to adopt every in described ground floor Vector Groups of random vectorIndividual orthonormal vector carries out the vector after disturbance.

(remarks 10) according to the information feedback device described in remarks 9, wherein, in described second layer Vector Groups toAmount T_m，i，lWith the vectorial V in described ground floor Vector Groups_mMeet following relation:

$\sqrt{1-\left|V_m^H{T}_{m,i,l}\right|}\&le;{\mathrm{\&epsiv;}}_i$

Wherein, m represents the sequence number of vector in ground floor Vector Groups, 1≤m≤M, and M is described ground floor Vector GroupsThe number of middle vector, the quantity of M and transmitting antenna equates; I represents described disturbance rank, and 1≤i≤I, described in I isThe maximum of disturbance rank; L be in each disturbance rank in corresponding described ground floor Vector Groups vector the described second layerThe sequence number of vector in Vector Groups, 1≤l≤L, L is the number of vector in described second layer Vector Groups; ε_iIt is i levelThe threshold value of disturbance rank, 0 < ε₁＜…＜ε_I＜1。

(remarks 11) according to the information feedback device described in remarks 8 to 10 any one, wherein, and described subscriber equipmentFor multiple; Described information feedback device also comprises:

Device selector, selects one or more subscriber equipmenies according to described Signal to Interference plus Noise Ratio;

And described signal transmission device is also for carrying out signal transmission to described one or more subscriber equipmenies.

(remarks 12) according to the information feedback device described in remarks 8 to 10 any one, wherein, and described subscriber equipmentFor multiple, each subscriber equipment adopts multiple two-stage codebooks; Described information feedback device also comprises:

The 3rd determining device, judges whether that the subscriber equipment of predetermined quantity adopts identical two-stage codebook calculating and sending to sendSignal to Interference plus Noise Ratio and corresponding pre-coding matrix index;

Indicator-transmitter, when being no in the judged result of described the 3rd determining device, sends the instruction of feedback again,Equipment for indicating user selects another two-stage codebook to recalculate Signal to Interference plus Noise Ratio;

And, described signal transmission device also in the judged result of described the 3rd determining device when being, adopt described phaseSame two-stage codebook carries out signal transmission to the subscriber equipment of described predetermined quantity.

(remarks 13) a kind of information feedback method, is applied to user equipment side, and described information feedback method adopts toolThere is the two-stage codebook of ground floor Vector Groups and second layer Vector Groups; Described information feedback method comprises:

According to the first default Signal to Interference plus Noise Ratio threshold value, from described ground floor Vector Groups, select to approach most channel direction letterThe primary vector of breath;

From second layer Vector Groups corresponding to described primary vector, select the most approaching according to disturbance rank order from low to highThe secondary vector of channel directional information;

Calculate Signal to Interference plus Noise Ratio based on described secondary vector; And described Signal to Interference plus Noise Ratio and the corresponding pre-coding matrix of feedbackIndex, this pre-coding matrix index comprises the index of primary vector and the index of secondary vector;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, the vector of described second layer Vector Groups with certificate andDistance between the vector of described ground floor Vector Groups or angular relationship and generate, the vector of described second layer Vector Groups existsNon-uniform quantizing in vector space.

(remarks 14) according to the information feedback method described in remarks 13, wherein, and according to the first default Signal to Interference plus Noise RatioThreshold value selects to approach most the primary vector of channel directional information from described ground floor Vector Groups, specifically comprises:

From described ground floor Vector Groups, select to approach most the primary vector of channel directional information;

The described primary vector of selecting according to described third selector calculates Signal to Interference plus Noise Ratio;

Judge whether the Signal to Interference plus Noise Ratio that described the second calculator calculates is less than described the first Signal to Interference plus Noise Ratio threshold value;

In the judged result of described the first determining device when being less than described the first Signal to Interference plus Noise Ratio threshold value, to described ground floorVector Groups is carried out orthogonal transformation.

(remarks 15), according to the information feedback method described in remarks 13, wherein, described information feedback method also comprises:

According to the rule of making an appointment between base station and subscriber equipment, to described ground floor Vector Groups and the described second layer toAmount group converts.

(remarks 16), according to the information feedback method described in remarks 13, wherein, described two-stage codebook is multiple, baseAfter described secondary vector calculates Signal to Interference plus Noise Ratio, described information feedback method also comprises:

Whether the Signal to Interference plus Noise Ratio that judgement calculates is greater than the second default Signal to Interference plus Noise Ratio threshold value;

In the time judging described Signal to Interference plus Noise Ratio and be not more than described the second Signal to Interference plus Noise Ratio threshold value, select another two-stage codebookTo recalculate Signal to Interference plus Noise Ratio; And, in the time judging described Signal to Interference plus Noise Ratio and be greater than described the second Signal to Interference plus Noise Ratio threshold value,Feed back described Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index.

(remarks 17), according to the information feedback method described in remarks 16, wherein, described information feedback method also comprises:

Receive the instruction of feedback again that base station sends;

And the instruction receiving according to described instruction receiver, selects another two-stage codebook to recalculate that letter is dry makes an uproarRatio.

(remarks 18) a kind of information feedback method, is applied to base station side, and described information feedback method adopts has theThe two-stage codebook of one deck Vector Groups and second layer Vector Groups; Described information feedback method comprises:

Receive the Signal to Interference plus Noise Ratio that subscriber equipment sends, and corresponding pre-coding matrix index, this pre-coding matrix indexComprise the rope of the secondary vector in index and the described second layer Vector Groups of the primary vector in described ground floor Vector GroupsDraw;

Determine pre-coding matrix based on described pre-coding matrix index, and carry out signal biography according to described pre-coding matrixDefeated;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, the vector of described second layer Vector Groups with certificate andDistance between the vector of described ground floor Vector Groups or angular relationship and generate, and the vector of described second layer Vector GroupsNon-uniform quantizing in vector space.

(remarks 19), according to the information feedback method described in remarks 18, wherein, described subscriber equipment is multiple; InstituteStating information feedback method also comprises:

Select one or more subscriber equipmenies according to described Signal to Interference plus Noise Ratio;

And, described one or more subscriber equipmenies are carried out to signal transmission.

(remarks 20), according to the information feedback method described in remarks 18, wherein, described subscriber equipment is multiple, everyOne subscriber equipment adopts multiple two-stage codebooks; Described information feedback method also comprises:

The subscriber equipment that judges whether predetermined quantity adopt identical two-stage codebook calculating and sending sent Signal to Interference plus Noise Ratio withAnd corresponding pre-coding matrix index;

While being no, send the instruction of feedback again in judged result, equipment for indicating user is selected another two-stage codebook weightThe new Signal to Interference plus Noise Ratio that calculates; And, when being, adopt described identical two-stage codebook to described predetermined number in judged resultThe subscriber equipment of amount carries out signal transmission.

Claims (10)

1. an information feedback device, is applied to user equipment side, and described information feedback device adopts the two-stage codebook with ground floor Vector Groups and second layer Vector Groups; Described information feedback device comprises:

First selector is selected to approach most the primary vector of channel directional information from described ground floor Vector Groups according to the first default Signal to Interference plus Noise Ratio threshold value;

Second selector, from second layer Vector Groups corresponding to described primary vector, selects to approach most the secondary vector of channel directional information according to disturbance rank order from low to high;

The first calculator, calculates Signal to Interference plus Noise Ratio based on described secondary vector;

Information ultramagnifier, feeds back Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index that described the first calculator calculates, and wherein said pre-coding matrix index comprises the index of described primary vector and the index of described secondary vector;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, distance or angular relationship between the vector basis of described second layer Vector Groups and the vector of described ground floor Vector Groups generate, the vector of described second layer Vector Groups non-uniform quantizing in vector space.

2. information feedback device according to claim 1, wherein, described ground floor Vector Groups comprises multiple orthonormal vectors, and the vector of described second layer Vector Groups is to adopt random vector to carry out to the each orthonormal vector in described ground floor Vector Groups the vector obtaining after disturbance.

3. information feedback device according to claim 2, wherein, the vector T in described second layer Vector Groups_m,i,lWith the vectorial V in described ground floor Vector Groups_mMeet following relation:

Wherein, m represents the sequence number of vector in described ground floor Vector Groups, 1≤m≤M, and M is the number of vector in described ground floor Vector Groups, the quantity of M and transmitting antenna equates; I represents described disturbance rank, 1≤i≤I, and I is the maximum of described disturbance rank; L be in each disturbance rank in corresponding described ground floor Vector Groups in the vectorial described second layer Vector Groups vector sequence number, 1≤l≤L, L be in corresponding described ground floor Vector Groups in the vectorial described second layer Vector Groups vector number; ε_iThe threshold value of i level disturbance rank, 0 < ε₁<…<ε_I<1。

4. information feedback device according to claim 1, wherein, described first selector specifically comprises:

Third selector, from described ground floor Vector Groups, selection approaches the primary vector of channel directional information most;

The second calculator, the described primary vector of selecting according to described third selector calculates Signal to Interference plus Noise Ratio;

The first determining device, judges whether the Signal to Interference plus Noise Ratio that described the second calculator calculates is less than described the first Signal to Interference plus Noise Ratio threshold value;

The first converter, when being less than, carries out orthogonal transformation to described ground floor Vector Groups in the judged result of described the first determining device;

And described third selector also selects to approach most the primary vector of channel directional information for the ground floor Vector Groups from orthogonal transformation.

5. according to the information feedback device described in claims 1 to 3 any one, wherein, described two-stage codebook is multiple, and described information feedback device also comprises:

The second determining device, judges whether the Signal to Interference plus Noise Ratio that described the first calculator calculates is greater than the second default Signal to Interference plus Noise Ratio threshold value;

Codebook selecting device, in the time that described the second determining device is judged described Signal to Interference plus Noise Ratio and is not more than described the second Signal to Interference plus Noise Ratio threshold value, selects another two-stage codebook to recalculate Signal to Interference plus Noise Ratio;

And described information ultramagnifier also when judging described Signal to Interference plus Noise Ratio at described the second determining device and be greater than described the second Signal to Interference plus Noise Ratio threshold value, feeds back described Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index.

6. information feedback device according to claim 5, wherein, described information feedback device also comprises:

Instruction receiver, receives the instruction of feedback again that base station sends;

And described codebook selecting device is the instruction for receiving according to described instruction receiver also, select another two-stage codebook to recalculate Signal to Interference plus Noise Ratio.

7. an information feedback device, is applied to base station side, and described information feedback device adopts the two-stage codebook with ground floor Vector Groups and second layer Vector Groups; Described information feedback device comprises:

Message recipient, receives Signal to Interference plus Noise Ratio that subscriber equipment sends and corresponding pre-coding matrix index, and described pre-coding matrix index comprises the index of the secondary vector in index and the described second layer Vector Groups of the primary vector in described ground floor Vector Groups;

Signal transmission device, determines pre-coding matrix based on described pre-coding matrix index, and carries out signal transmission according to described pre-coding matrix;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, distance or angular relationship between the vector basis of described second layer Vector Groups and the vector of described ground floor Vector Groups generate, and the vector of described second layer Vector Groups non-uniform quantizing in vector space;

Described primary vector is selected to approach channel directional information most by described subscriber equipment according to the first default Signal to Interference plus Noise Ratio threshold value and is obtained from described ground floor Vector Groups, and described secondary vector is selected to approach channel directional information most and obtained according to disturbance rank order from low to high from second layer Vector Groups corresponding to described primary vector by described subscriber equipment.

8. information feedback device according to claim 7, wherein, described subscriber equipment is multiple, each subscriber equipment adopts multiple two-stage codebooks; Described information feedback device also comprises:

The 3rd determining device, judges whether that the subscriber equipment of predetermined quantity adopts identical two-stage codebook calculating and sending to send Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index;

Indicator-transmitter, when being no in the judged result of described the 3rd determining device, sends the instruction of feedback again, and equipment for indicating user selects another two-stage codebook to recalculate Signal to Interference plus Noise Ratio;

And, described signal transmission device also in the judged result of described the 3rd determining device when being, adopt described identical two-stage codebook to carry out signal transmission to the subscriber equipment of described predetermined quantity.

9. an information feedback method, is applied to user equipment side, and described information feedback method adopts the two-stage codebook with ground floor Vector Groups and second layer Vector Groups; Described information feedback method comprises:

From described ground floor Vector Groups, select to approach most the primary vector of channel directional information according to the first default Signal to Interference plus Noise Ratio threshold value;

From second layer Vector Groups corresponding to described primary vector, select to approach most the secondary vector of channel directional information according to disturbance rank order from low to high;

Calculate Signal to Interference plus Noise Ratio based on described secondary vector; And feeding back described Signal to Interference plus Noise Ratio and corresponding pre-coding matrix index, described pre-coding matrix index comprises the index of described primary vector and the index of described secondary vector;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, distance or angular relationship between the vector basis of described second layer Vector Groups and the vector of described ground floor Vector Groups generate, the vector of described second layer Vector Groups non-uniform quantizing in vector space.

10. an information feedback method, is applied to base station side, and described information feedback method adopts the two-stage codebook with ground floor Vector Groups and second layer Vector Groups; Described information feedback method comprises:

Receive Signal to Interference plus Noise Ratio that subscriber equipment sends and corresponding pre-coding matrix index, described pre-coding matrix index comprises the index of the secondary vector in index and the described second layer Vector Groups of the primary vector in described ground floor Vector Groups;

Determine pre-coding matrix based on described pre-coding matrix index, and carry out signal transmission according to described pre-coding matrix;

Wherein, between the vector of described ground floor Vector Groups, keep orthogonal, distance or angular relationship between the vector basis of described second layer Vector Groups and the vector of described ground floor Vector Groups generate, and the vector of described second layer Vector Groups non-uniform quantizing in vector space;

Described primary vector is selected to approach channel directional information most by described subscriber equipment according to the first default Signal to Interference plus Noise Ratio threshold value and is obtained from described ground floor Vector Groups, and described secondary vector is selected to approach channel directional information most and obtained according to disturbance rank order from low to high from second layer Vector Groups corresponding to described primary vector by described subscriber equipment.