CN101534268B - Codebook design and feedback method for pre-coding of multi-input and multi-output system - Google Patents

Codebook design and feedback method for pre-coding of multi-input and multi-output system Download PDF

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CN101534268B
CN101534268B CN 200810084748 CN200810084748A CN101534268B CN 101534268 B CN101534268 B CN 101534268B CN 200810084748 CN200810084748 CN 200810084748 CN 200810084748 A CN200810084748 A CN 200810084748A CN 101534268 B CN101534268 B CN 101534268B
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codebook
feedback
layer
channel
index
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CN101534268A (en )
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孙云锋
段亚军
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中兴通讯股份有限公司
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Abstract

A codebook design and a feedback method for pre-coding of a multi-input and multi-output system relate to the emitter and receiver of an MIMO system. The method comprises the following steps of: a) designing layered upwards compatible codebook, namely carrying out layered quantification processing to the codebook according to the feedback expense requirement of the codebook, also namely grouping the codebook by layers; wherein each layer comprises a plurality of groups; each group comprises a plurality of codebooks and the first element of the lower layer of the codebook is the value of the upper layer of the codebook under the quantification situation; b) calculating the index of the feedback codebook and selecting the codebook feedback type to feed back the index of the codebook by the receiver; c) calculating the codebook weights by the emitter according to the codebook feedback type. Under the situation of no increasing system expense, the invention obtains exact channel information by the combination of previous and next feedback information. When the channel changes quickly, the method can be degenerated as the design of single layer codebook, thus ensuring the effectivenessof the feedback channel information.

Description

一种多输入多输出系统预编码的码本设计及反馈方法 A multiple input multiple output precoding codebook design a system and method for feedback

技术领域 FIELD

[0001] 本发明涉及无线通信领域内多输入多输出(MIMO,MultiHnput Multi-Output)系统编码方法,尤其涉及MIMO系统中预编码(!decoding)的码本设计方法。 [0001] The present invention relates to multiple input multiple output (MIMO, MultiHnput Multi-Output) wireless communications system within a coding method, in particular, it relates to a precoding MIMO system (! Decoding) codebook design methods.

背景技术 Background technique

[0002] 预编码技术是通过接收方反馈的信道信息,对发送的数据用预编码矩阵进行处理,使各个数据流在空间信道传输过程中等效为相互独立的信道进行传输,但前提是发射方能够获得信道信息。 [0002] The precoding technique is, data transmitted by the channel information received from feeding back the precoding matrix process, the respective data stream in the spatial channels during transmission equivalent transmitted as independent channels, provided that the transmitting side channel information can be obtained. 实际的设计中,频分双工(FDD,Frequency Division Duplex)系统中或时分双工(TDD,Time Division Duplex)系统中信道互异性失效情况下,信道信息通常需要通过反馈获得,而信道信息反馈开销是系统设计中必须考虑的一个问题。 The actual design, frequency division duplex (FDD, Frequency Division Duplex) system or a time division duplex (TDD, Time Division Duplex) system, the channel reciprocity case, the channel information is typically required to obtain feedback failure, and channel information feedback cost is a problem in the system design must be considered. 因此现有技术都是通过码本的方式进行处理,经通过对信道可能的情况进行量化,并用当前信道的分解量去匹配一个最为接近的码本,并反馈该码本的序号,但实际上,如果要使码本遍历所有最基本的信道可能性,仍需要很大的反馈开销。 Thus the prior art are carried out by the codebook manner, quantized channel possible when passed, and with the current amount of decomposition of the channel to match a closest codebook, and feeds back the codebook number, but in fact , if you want this code to traverse all the basic channels possibility, still requires a lot of feedback overhead. 例如假设每根天线的信道参数仅仅量化为4种取值,如果各个信道独立,且流之间独立,假设发射天线个数为m,使用的数据流数目为k,则将会有(4)λ个码本。 For example, assume each antenna quantized channel parameters only four kinds of values, if each channel independently, and independently between the flow, assuming the number of transmitting antennas is m, the number of data streams to be used is k, then there will be (4) λ codebook. 尽管这种量化已经很粗糙,但是所需开销仍然是很大的。 Although this has been quantified very rough, but still required a lot of overhead.

[0003] 对信道反馈开销的限制和对信道反馈信息精确度的要求形成了一对矛盾。 [0003] limit of channel feedback overhead and the channel information feedback accuracy is required to form a contradiction. 因此, 如何在限制开销的情况下,提高反馈码本的精度是当前研究的一个难题。 So, how in the case of limiting the cost and improve the accuracy of the feedback codebook is a problem of current research. 现有的码本设计方法,在限制开销的情况下,很难保证反馈码本的精确度。 Existing codebook design methods, in the case of limiting the cost, it is difficult to ensure the accuracy of the feedback codebook. 码本分层的思想是通过设计几个不同层次上的码本,并通过不同层次上的码本组合来达到提高反馈精度的效果,在同样反馈开销的情况下,使得码本对信道的量化获得更高的精度。 Thought hierarchical codebook by codebook design on several levels, and to achieve the effect of improving the accuracy of feedback codes by the present compositions at different levels, in the case where the same feedback overhead, such that the quantization codebook to the channel for greater accuracy.

发明内容 SUMMARY

[0004] 本发明所要解决的技术问题是提供一种多输入多输出系统预编码的码本设计及反馈方法,能够在不增加系统反馈开销的情况下提高反馈码本的精确度,且能与现有的码本设计方法相兼容。 [0004] The present invention solves the technical problem is to provide a multi-input multi-output system precoding codebook feedback method and design can be improved accuracy of feedback codebooks without increasing the overhead of the feedback system, and capable of existing codebook design methods is compatible.

[0005] 为了解决上述技术问题,本发明提供了一种多输入多输出系统预编码的码本设计及反馈方法,涉及多输入多输出系统的信号发射方和信号接收方,该方法步骤为: [0005] To solve the above problems, the present invention provides a MIMO pre-coding system and a feedback codebook design methods, involving multiple input multiple output system signal transmitter and the signal receiver, the method steps of:

[0006] (a)设计向上兼容的分层码本,根据码本的反馈开销要求对码本进行分层量化处理,亦即将码本按层分组,每一层包括多个组,每一组包括多个码本,且下一层码本的第一个元素为上一层码本量化情况下的取值; [0006] (a) Design of upward compatible hierarchical codebook, a codebook according to codebook feedback overhead requirements layered quantization process, i.e. codebook grouped in layers, each layer comprising a plurality of groups, each group comprises a plurality of codebooks, and the first element of the next layer is the upper layer of the codebook codes the quantized values ​​under the present situation;

[0007] (b)信号接收方计算反馈码本的索引,并选择码本反馈方式反馈码本的索引。 [0007] (b) the signal receiver calculates the feedback codebook index, the codebook and select the feedback mode feedback codebook index.

[0008] 进一步地,步骤(a)设反馈开销为η个bit,且码本的分层数目为k,按层分组即依层次地分组:第一层将On)k个码本分为2"个组,每组包括Qn) Η个码本;第二层继续将每组个码本分为2η个组,......,直至第k层的每组中的码本个数为1个。 [0008] Further, the step (a) is provided a feedback overhead η 'bit, and the number of hierarchical codebook is k, i.e., grouped by hierarchically grouped in layers: a first layer On) k codebooks are divided into 2 "groups, each comprising Qn) Η codebooks; a second layer continue into each codebook 2η groups, ......, until the k of the codebook number of each group It is one.

[0009] 进一步地,步骤(a)对于对等分层码本的设计,下一层的码本与上一层具有相等的地位,不同层表示码本的不同分量;对于非对等分层码本的设计,下一层码本是对上一层量化误差的进一步量化。 [0009] Further, the step (a) for peer hierarchical codebook design, a codebook of the next layer and the upper layer have equal status, showing the different layers of different components codebook; for non-hierarchical peer codebook design, a codebook next layer is a layer further quantizing a quantization error.

[0010] 进一步地,步骤(b)码本反馈方式包括以下的一种或多种: [0010] Further, the step (b) feedback mode codebook comprises one or more of:

[0011] (1)交叉方式的码本反馈,适用于对等分层码本的反馈,亦即将多层码本依时隙交错地轮询反馈,即当前时隙反馈第一层码本,则依次在下一时隙反馈下一层码本;不同层的码本具有相等的可靠性要求; [0011] Code (1) of the present embodiment crossing feedback, applicable to other hierarchical codebook feedback, i.e. the multilayer codebook feedback by polling slot interlace, i.e., a first layer of a feedback current slot codebook, in the next time slot successively lower level feedback codebook; codes of different layers present having equal reliability requirements;

[0012] (2)按照不同可靠性要求对码本反馈,适用于非对等分层码本的反馈,亦即将可靠性要求最高的层的码本通过控制信道反馈,对其它可靠性要求较低的层的码本通过数据信道反馈; [0012] (2) according to different requirements of reliability codebook feedback, and other suitable non-hierarchical codebook for feedback, i.e., the highest reliability of a control channel layer codebook feedback, other than reliability a lower layer of the present code feedback data channel;

[0013] (3)结合部分反馈和相关运算方式的码本反馈,亦即收发双方结合不同层码本之间的关系,将反馈层的码本和本地存储的非反馈层的码本通过函数运算获得最终的预编码加权值码本。 [0013] (3) binding portion of the feedback and a code correlation operation of the present embodiment the feedback, i.e., send and receive both binding relationship between the different layers of this code, the code layer of the non-feedback codebook feedback layer and locally stored by the function of the present calculating final values ​​of the precoding codebook weights.

[0014] 进一步地,码本反馈方式C3)包括以下方式的一种或两种: [0014] Further, codebook feedback scheme C3) comprises one or both of the following ways:

[0015] (3A)每次仅反馈其中的一层码本,用于对本地保存的码本进行修正,而第一层码本用于对本地码本进行初始化; [0015] (3A) each of which only one feedback codebook for locally stored codebook correction, a first layer and a codebook to initialize the local codebook;

[0016] (3B)每次反馈码本时,用一个bit表示当前码本是对上一层码本进行修正还是更换,用剩余的bit表示用于修正或更换的码本的索引;对上一层码本进行修正,是指反馈比当前层更低层的码本,更低层的码本是对前一层码本的细化或对前一层码本的修正;对上一层码本进行更换,是指在下一时隙信号接收方发现前后码本变化较大时,不再对上一层进行细化或修正,而从上一层重新选择一个码本。 [0016] (3B) each time the feedback codebook, with a bit representing the current codebook is a codebook with a layer of correction or replacement, or denotes a correction codebook index with the remainder of the replacement bit; pairs this correction code layer, the lower layer refers to the feedback codebook than the current layer, the lower layer of the preceding layer codebook is a codebook or amendments to the refinement of the previous layer codebook; upper hierarchy codebook replacement means in the next time slot before and after the discovery signal received codebook change is large, the layer of no longer refined or corrected, re-selecting a codebook from a layer.

[0017] 进一步地,如果采用码本反馈方式(1),则所述方法还包括步骤: [0017] Further, if the codebook feedback scheme (1), the method further comprising the step of:

[0018] (bl)根据上一次反馈的码本的索引对应的层号i,计算当前应该反馈的层号mod[(i+l),k],其中mod[]为取模函数,所述k为码本的分层数目; [0018] (bl) corresponding to the index of the codebook fed back on a layer number i, the layer number calculated mod [(i + l), k] of the current to be fed back, wherein MOD [] is a modulo function, the k is the number of hierarchical codebook;

[0019] (b2)根据当前时隙的信道的分解值,并结合上一次的反馈结果,提取当前层对应的分量,并匹配一个最为接近的码本对应的索引进行反馈。 [0019] (b2) the current slot according to the channel value decomposition, and a feedback result of binding, extracted components corresponding to the current layer, and a closest matching codebook index corresponding feedback.

[0020] 进一步地,如果采用码本反馈方式(2),则所述方法还包括步骤: [0020] Further, if the codebook feedback scheme (2), the method further comprising the step of:

[0021] (bl)根据当前时隙的信道进行分解,得到信道权值分量,并用信道权值分量与第一层码本匹配,得到时隙第一层码本的索引; [0021] (bl) the current slot according to the channel decomposition, to obtain the right value of the component of the channel, and a channel with a component of the first layer weights matching codebook, codebook index in a slot to give a first layer;

[0022] (b2)分别计算各个资源块RB范围内信道的平均值对应的分解量,计算获得的分解量与第一层码本索引对应的码本的量化误差匹配,并将量化误差的进一步量化值与其它层码本进行匹配,得到各个RB中的其它层码本的索引; [0022] (b2) corresponding to the average amount of decomposition within each resource block RB range channel are calculated, the quantization error obtained in the decomposition amount calculating a first layer of the codebook index corresponding to the matching codebook, the quantization error and further value quantization codebook with the other matching layer, to obtain each RB in other layers codebook index;

[0023] (b3)将第一层的码本索引置于控制信道进行传输,将各个RB中的其它层码本的索引分别置于上行业务信道进行传输。 [0023] (b3) a first layer of the code of the present index on the control channel transmission, the other layers in each RB codebook index were placed uplink traffic channel transmission.

[0024] 进一步地,如果统计得到的信道的相干时间与反馈周期相当,则仅计算第一层码本,并与各组中的第一个码本对应的索引分别匹配,信号接收方每次仅反馈第一层码本的索引;如果统计得到的信道的相干时间远大于反馈周期,则按照码本反馈方式(1)或方式(2)或方式(3)进行反馈。 [0024] Further, if the counted coherence time of the channel and the feedback period equivalent to only the first layer codebook is calculated, and the matching with each group corresponding to a first codebook index, respectively, each signal receiver only feedback codebook index of the first layer; if the coherence time of the channel is much larger than the counted feedback cycle in accordance with the feedback codebook feedback scheme (1) or method (2) or the mode (3).

[0025] 进一步地,所述方法还包括步骤(C)信号发射方根据码本反馈方式对码本权值进行计算。 [0025] Preferably, the method further comprises the step of (C) the signal transmitting side calculates weight according to a codebook the codebook feedback mode.

[0026] 进一步地,如果信号接收方采用交叉方式的码本反馈,则对码本权值进行计算包括步骤: [0026] Further, if the signal receiver using cross feedback mode codebook, the codebook comprising the step of calculating weights:

[0027] (Cl)分别根据当前时隙反馈的码本索引和前一时隙反馈的码本索引获得当前时隙的码本权值和前一时隙的码本权值; [0027] (Cl) respectively the codebook weights of the codebook weights for the current slot and the previous slot according to the current codebook index feedback slot and the previous slot feedback codebook index;

[0028] (U)组合当前时隙的码本权值和前一时隙的码本权值得到最终的码本加权向量。 [0028] (U) a combination of the current codebook the codebook weights right slot and the previous slot worth to final codebook weight vector.

[0029] 进一步地,如果信号接收方采用按照不同可靠性要求对码本反馈的方式进行码本反馈,则对码本权值进行计算包括步骤: [0029] Further, if the signal receiver employed for codebook feedback codebook feedback of embodiment according to the different reliability requirements, the codebook values ​​are calculated weight comprising the steps of:

[0030] (cl)通过从控制信道解读该层的码本索引获得该层的码本; [0030] (cl) the layer obtained by decoding the code of the codebook according to an index from the control channel layer;

[0031] (c2)根据每个RB的码本索引,获得每个RB的其它层码本; [0031] (c2) each RB according to the codebook index, codebook obtain other layers each RB;

[0032] (c3)用每个RB的码本对所述层码本进行处理,得到每个RB其它层的码本并计算加权向量。 [0032] (c3) of the layer codebook treated with each RB codebook to obtain a codebook for each RB other layers and calculates a weight vector.

[0033] 本发明基于码本分层的设计思想,提出了一种可以和单层码本兼容的分层码本设计方法,并提供了多种码本反馈方案。 [0033] The present invention is based on hierarchical codebook design, and can propose a compatible single codebook hierarchical codebook design methods, and provides a variety codebook feedback scheme. 可以在不增加系统反馈开销的情况下,通过前后两次反馈信息的组合得到精确的信道信息。 Possible without increasing the overhead of the feedback system, the feedback information by a combination of the two longitudinal accurate channel information. 在信道变化周期远远大于反馈周期的情况下,尤其是在UE速度较低的情况下,由于信道的相干时间较长,在前后两次反馈时间内信道变化较慢。 In the case where the channel variation is much larger than the feedback cycle period, especially at low UE speed is due to the longer coherence time of the channel, the channel changes slowly over time before and after the two feedback. 通过分层反馈可以较大程度地提高信道信息精度。 Can considerably improve the accuracy of channel information through hierarchical feedback. 而在信道变化周期与反馈周期相当的情况下,该方法又可以蜕化为单层码本设计,保证反馈信道信息的有效性。 In the comparable period of the feedback channel variation period cases, the method may further degenerate as a single codebook design, to ensure the effectiveness of the feedback channel information. 本发明的分层码本设计和码本反馈的技术特点,能够与预编码技术通常主要适用于UE低速情况相吻合。 Hierarchical codebook design of the present invention and the technical characteristics of the feedback codebooks, can be consistent with the pre-coding technique generally applied to the main low speed UE.

附图说明 BRIEF DESCRIPTION

[0034] 图1为本发明的与单层码本兼容的分层码本设计示意图; [0034] FIG. 1 of the present invention is compatible with the single codebook is a schematic view of a hierarchical codebook design;

[0035] 图2为本发明的分层码本交错反馈的原理示意图; A schematic view of the principle of feedback [0035] hierarchical code in FIG. 2 of the present invention, the present staggered;

[0036] 图3为本发明的分层码本分层反馈的示意图; [0036] FIG 3 according to the present invention BLAST schematic hierarchical feedback;

[0037] 图4为本发明的结合部分反馈和层运算获取权值方法示意图; [0037] Figure 4 is a binding layer and a portion of the feedback calculation method of obtaining the weight schematic invention;

[0038] 图5为本发明的MIMO系统预编码的码本设计及反馈方法流程图。 [0038] FIG. 5 MIMO pre-coding system of the present invention and a feedback codebook design method flowchart.

具体实施方式 detailed description

[0039] 本发明提供的一种多输入多输出系统预编码的码本设计及反馈方法,包括步骤: 基于码本分层的设计思想,设计向上兼容(即分层码本设计可以兼容单层码本的设计)的不同方案的分层码本;信号接收方计算反馈码本的索引,并根据不同方案的分层码本选择分层码本的反馈方式反馈码本的索引;信号发射方根据信号接收方的码本反馈方式计算码本权值。 [0039] The present invention provides a multiple input multiple output precoding codebook design system and a feedback method, comprising the steps of: based on hierarchical codebook design, design upward compatible (i.e., hierarchical codebook design is compatible single hierarchical codebook codebook design) of the different schemes; feedback codebook index signal recipient computing and feedback codebook index feedback layered embodiment of the present selection codes of different hierarchical codebook; a signal transmitting side this weight value calculation code according to the signal receiver codebook feedback manner.

[0040] 以下结合实施例和附图,对本发明上述技术方案进行详细描述。 [0040] The following Examples and accompanying drawings, the above-described aspect of the invention is described in detail.

[0041] 如图1所示,将码本进行分层设计,用第一层表示主要码本,同现有的单层码本设计完全相同,其它层为校正码本或具有相同地位的按照不同参考值设计的码本,其它层插在第一层码本之间。 [0041] 1, stratified codebook design, a codebook with a main first layer, the same conventional single codebook design is identical to the other layers of this correcting code or status in accordance with the same different reference values ​​codebook design, further layers interposed between the first layer codebook. 即第一层的每个码本对应一组不同层的码本,当码本序号取值仅仅为每组的第一个时,则为单层码本情况,否则为多层码本设计情况。 I.e., each code corresponding to a first layer is present in different layers of the group codebook, a time code only when the present value of the serial number of each group, for the single codebook, the codebook or a multilayer design where .

[0042] 例如2层码本情况,设反馈开销为η个bit,将码本量化为2n组,同时每组包括2n 个码本,则两组组合后可以得到个码本。 [0042] 2 layer codebook e.g., the set of feedback overhead η 'bit number, quantization codebook is 2n group, and each group includes 2n codebook, the two compositions can be obtained after the codebook. 每一个码本组中的第1个码本为主要码本,当二层码本反馈失败或不进行反馈时,以该主要码本进行加权。 The first codebooks each codebook group as the main codebook, codebook feedback when Layer performs feedback fails or not, to present the primary code weighting. 因此上述分层码本的设计方法可以兼容于不分层情况下的码本设计方法。 Thus said hierarchical codebook design methods compatible to the code in the case of the present design methods are not hierarchical.

[0043] 由于码本分层会有对等分层和非对等分层的差异,亦有通过对多层码本的组合得到实际需要的码本和将反馈层码本和非反馈层码本通过函数运算得到实际需要的码本之分,因此,针对上述分层码本的设计方案,本发明给出了以下几种分层码本的反馈方式。 [0043] Since the codebook have a hierarchical peer stratification and differentiation of non-stratified and the like, also by a combination of the obtained multilayer codebook and a codebook feedback layer and the non-feedback codebook code actually needed layer this actually needed to obtain a codebook divided by function operation, therefore, for the design of the above-described hierarchical codebook, according to the present invention gives the following hierarchical codebook feedback manner.

[0044] 方式1 :针对相同层次可靠性要求的码本交叉反馈方法 [0044] Embodiment 1: for the same level of reliability codebook cross feedback method

[0045] 具体地如图2所示,将两层码本交错地轮询反馈,即如果当前反馈的为第一层码本,则在下一个时隙反馈第二层码本。 [0045] Specifically, as shown in Figure 2, the two feedback codebook alternately polling, i.e., if the current feedback codebook for a first layer, the second layer of the next time slot codebook feedback. 由于两层码本的反馈地位是对等的,因此这种反馈机制较适合于对等分层码本的码本设计方法。 Since the two feedback codebook status is equal, so this feedback mechanism is more suitable for other hierarchical codebook of codebook design methods.

[0046] 所谓对等分层码本是指两个层面的码本具有相等的可靠性要求,发射方通过对两层码本的组合得到实际需要的码本。 [0046] Peer-called hierarchical codebook refers to the codebook has two levels of reliability equal to the transmitting side by a combination of two codebook to obtain a codebook actually needed. 例如,将码本分为对等的两组,第一组表示第一层,第二组表示第二层;或者第一层码本用来反馈量化结果的实部,而第二层码本用来反馈量化结果的虚部。 For example, for the codebook into two groups and the like, a first set represents a first layer, a second layer of a second set of expressed; a first layer or codebook feedback is used to quantify the results of the real portion, and the second layer codebook quantized feedback for the imaginary part of the result.

[0047] 图2假设层数为2,接收方在不同的反馈时隙交错地反馈层1和层2的码本信息。 [0047] FIG. 2 is assumed that the number of layers is 2, the receiver code layers 1 and 2 according to the feedback information in different time slots alternately feedback. 发射方利用前两次反馈的两层码本的索引确定码本信息的组合,来构造当前传输时间间隔(TTI, Transmit Time Interval)使用的权值。 Two codebook index twice before transmitting side using the feedback codebook to determine the combined information to construct a current transmission time interval weight (TTI, Transmit Time Interval) is used.

[0048] 方式2 :针对不同层次可靠性要求的码本在不同信道反馈 [0048] Embodiment 2: codebooks for different levels of reliability requirements different feedback channel

[0049] 具体地如图3所示,设分层码本设计为k层,将可靠性要求最高的层通过控制信道的控制信令反馈,由于控制信令的传输精度较高,可以保证该层码本传输的可靠性,保证信道的基本传输功能;其它对可靠性要求较低的层的码本在数据信道传输。 [0049] Specifically, as shown in FIG. 3, provided k hierarchical codebook design layer, the top layer reliability feedback control signaling channel, the control signaling due to higher transmission accuracy can be guaranteed that the layer codebook transmission reliability, to ensure the basic functions of the transmission channel; transmitted over the data channel reliability requirements codebook other lower layer. 由于这种码本反馈机制对不同层码本的反馈可靠性不同,因此这种方案更适合非对等分层码本的设计方法。 Because of this feedback mechanism different codebooks for different layers of the reliability of the feedback codebooks, and therefore more suitable for this embodiment of the design method, etc. hierarchical codebook.

[0050] 所谓非对等分层码本设计是指设计的两个层面的码本重要性对系统来说存在差异,系统对其可靠性要求也不同,其它层码本的设计是为了提高第一层码本的精度。 [0050] other so-called non-hierarchical codebook of design is the design of the two levels of importance are different codebook for the system, the system reliability requirements thereof are also different, other layers designed to codebook Improvement one codebook accuracy.

[0051] 图3仍假设层数为2,第二层码本是对第一层码本量化误差的细量化,此时无论在时域还是在频域的颗粒度都比第一层码本精细。 [0051] FIG 3 is still assumed that the number of layers is 2, the second layer is a fine quantization codebook to the first layer codebook quantization error, in which case both in the time domain or in the first layer of frequency domain codebook granularity than the fine. 例如,第一层码本反映的是TTI内多个资源块(RB,Resource Block)的平均信道信息的分解量,而第二层码本反映TTI内每个RB相对平均信道H分解量的偏差,此时更适合采用该反馈方案进行反馈。 For example, a first codebook layer reflects the plurality of resource blocks within a TTI (RB, Resource Block) The average amount of decomposition of the channel information, the channel H and the relative average amount of decomposition of each RB in the first layer reflect codebook TTI deviation In this case the feedback scheme is more suitable for feedback. 图中1_1表示第一层码本反馈索引,其位于控制信道或其它传输可靠性要求较高且资源较有限的信道。 FIG 1_1 represents a first feedback codebook index layer, which is located a control channel or other transmission requirements of high reliability and a more limited channel resources. 11_1、 11_2、...分别为不同RB内的第二层码本索引(每个RB计算的权值向量为与1_1对应的码本的量化误差的进一步量化值)。 11_1, 11_2, ... codebook index of the second layer (the weight vectors calculated for each RB codebook quantization error is further quantized 1_1 corresponding values) are different RB. 接收方通过用第二层码本索引对应的权值对第一层码本对应地进行旋转轮询或其它处理,来提高反馈码本信息的精度。 Polling the receiver rotation or other processing corresponding to the first codebook layer by a second layer with a weight value corresponding to codebook index, codebook feedback to improve the accuracy of the information.

[0052] 方式3 :结合部分反馈和相关运算对码本进行反馈 [0052] Embodiment 3: a correlation operation and a binding portion of the feedback codebook feedback

[0053] 具体地如图4所示,接收方仅仅反馈几层码本中的其中的一层(不一定是第一层),收发双方结合不同层码本之间的关系,将反馈层的码本A和本地存储的非反馈层的码本B通过一个具体的函数F (A,B)的运算获得最终的预编码加权值码本B'(譬如B' = AXB,或者B,=aXA 士B 等等)。 [0053] Specifically, the receiving side only feedback codebook layers wherein layer (not necessarily the first layer), a transceiver in conjunction with both the relationship between the different layers of this code, the feedback layer 4 code codebook Nonfeedback layer a and a local storage according to B obtained by calculation of a specific function F (a, B) of the final pre-encoding weight value codebook B '(for example, B' = AXB, or B, = aXA Shi B, etc.).

[0054] 如图5所示为本发明的MIMO系统预编码的码本设计方法,包括以下步骤: MIMO system of the present invention shown in [0054] FIG. 5 precoding codebook design method, comprising the steps of:

[0055] 步骤510 :设计向上兼容的不同方案的分层码本; [0055] Step 510: Design hierarchical codebook upward compatibility of different schemes;

[0056] 首先布根据码本的反馈开销要求进行码本量化,设反馈开销为η个bit,且码本层 [0056] First quantization codebook cloth according to claim codebook feedback overhead, a set feedback overhead η 'bit, and the code of this layer

7数为k,设计2to = On)k个码本,第一层将码本分为2"个组,每组包括Qn) Η个码本;第二 7 number k, design 2to = On) k codebook, the codebook is divided into a first layer 2 "groups, each comprising Qn) Η codebooks; second

层继续将每组的码本分组,每组包括On) k_2个码本;......直至最底层(第k层)的每组 Layer continues to present each code groups, each comprising On) k_2 codebooks; ...... up to the bottom (the k-th layer) in each group

中的码本个数为1个。 The codebook number is one. 其中对码本的量化满足以下原则: Wherein the quantization codebook satisfies following principles:

[0057] (1)对于非对等分层码本的设计,下一层码本是对上一层量化误差的量化,且下一层(i层)码本的第一个元素为上一层(i_l层)码本量化情况下的取值(该原则是为了和单层或k-Ι层码本兼容); [0057] (1) for non-equivalence hierarchical codebook design, a codebook next layer is a layer of quantizing the quantization error, and the lower layer (i layer) the first element of the codebook is a layer (layer I_L) quantization code values ​​under the present situation (and the principle for a single layer or k-Ι compatible layer codebook);

[0058] (2)对于对等分层码本的设计,下一层的码本与上一层具有相等的地位,不同层表示码本的不同分量。 [0058] (2) For the peer hierarchical codebook design, a codebook of the next layer and the upper layer have equal status, showing the different layers of different components codebook. 此时为兼顾与单层码本的兼容,下一层(i层)码本的第一个元素为上一层(i_l层)码本量化情况下的取值。 At this time, compatible with both single codebook, the next layer (i layer) The first element is the codebook quantized values ​​in the present case a layer (layer I_L) code.

[0059] 步骤520 :接收方计算反馈码本的索引,并根据不同设计方案选择不同方式反馈码本; [0059] Step 520: The receiver calculates the feedback codebook index, and choose different ways depending on the feedback codebook design;

[0060] (1)如果采用交叉方式进行码本反馈,判断上一次反馈的码本索引对应的层号,假设为i,且码本层数为k,利用取模函数modO计算当前应该反馈的层号mod[(i+l),k];根据当前时隙的信道H的分解值,并结合以前的反馈结果,提取当前层对应的分量,并匹配一个最为接近的码本对应的索引进行反馈。 [0060] (1) If the cross codebook feedback manner, a feedback on the determination of a codebook index corresponding to the layer number is assumed to be i, the number of layers and the present code is k, is calculated using modulo function should the current feedback modO layer number mod [(i + l), k]; exploded value of the channel H of the current time slot, and in conjunction with the previous result of feedback, extraction layer corresponding component of the current, and match a closest codebook corresponding to the index feedback.

[0061] 如果统计得到的信道变化的相干时间与反馈周期相当,则仅仅计算一层码本,并与各组中的第一个码本对应的索引分别匹配,接收方每次仅仅反馈第一层码本的索引。 [0061] If the coherence time of the channel variation obtained statistics and the feedback period equivalent to the calculated one codebook only, and match with each group corresponding to a first codebook index, respectively, each receiving side only the first feedback layer codebook index.

[0062] (2)如果采用按照不同可靠性要求对码本反馈,则按照下述步骤进行: [0062] (2) if the feedback codebook, the following procedure is carried out according to different reliability requirements:

[0063] A、根据当前时隙的信道H进行分解,得到信道权值分量,并用信道权值分量与第一层码本匹配,获得该时隙第一层码本的索引; [0063] A, H for the current slot according to the channel decomposition, to obtain the right value of the component of the channel, and a channel with a component of the first layer weights matching codebook to obtain a codebook index of the time slot of the first layer;

[0064] B、各个RB分别计算RB范围内信道H的平均值对应的分解量,计算获得的分解量与第一层码本索引对应的码本的误差匹配,并将所述量化误差的进一步量化值与其它层码本匹配,得到各个RB中的其它层码本索引; [0064] B, each RB RB are calculated within the range corresponding to the average amount of decomposition of the channel H, the amount of decomposition obtained by calculation of the matching error corresponding to the first layer of the codebook index codebook and the quantization error is further this quantized value codes match with other layers to give the other layer of each RB codebook index;

[0065] C、将第一层的码本索引放在控制信道进行传输,将各个RB匹配得到的其它层码本分别放在上行信道对应RB的业务信道的子载波进行传输。 [0065] C, the code index of the first layer is present on the control channel transmission, the other layers codes match each RB are obtained in the present uplink channels corresponding to subcarriers of an RB traffic channel transmission.

[0066] (3)如果采用结合部分反馈和相关运算对码本反馈,则可分别采用以下方式进行: [0066] (3) If a binding operation on the portion of the feedback codebooks and the feedback correlation may be carried out respectively in the following manner:

[0067] (3A)每次仅反馈其中一层码本用于对本地保存的码本进行修正,而第一层码本用于对本地码本进行初始化。 [0067] (3A) wherein each feedback only one codebook for locally stored codebook correction, a first layer and a codebook initialized local codebook.

[0068] (3B)每次反馈时,用一个bit表示当前码本是对上一层码本进行修正还是更换, 用剩余的bit表示用于修正或更换的码本的索引。 [0068] (3B) each time feedback, with a bit representing the current codebook is a codebook with a layer of correction or replacement, represents a codebook for correcting or replacing the index with the remaining bit.

[0069] 所谓对上一层码本的修正,是指反馈比当前层更低层的码本,该更低层的码本是前一层码本的细化或用于对前一层码本的修正。 [0069] a layer of a so-called correction codebook, codebook feedback means lower level than the current layer, the lower layer of the preceding layer codebook is a codebook for refining or previous layer codebook correction. 所谓更换码本,是指在下一时隙接收方发现前后码本变化较大的情况下,不再对上一层进行细化或修正,而是从上一层重新选择一个码本。 The so-called replacement of the codebook, the receiving means of the next time slot before and after the discovery of the present code changes is large, no longer a layer of refined or corrected, but re-selecting a codebook from a layer.

[0070] 步骤530 :发射方根据接收方的码本反馈方式计算码本权值。 [0070] Step 530: the transmitting side calculates the codebook weights according to the recipient codebook feedback manner.

[0071] (1)如果接收方采用交叉方式进行码本反馈,则按照下述步骤进行: [0071] (1) If the receiver uses cross codebook feedback manner, in accordance with the following steps:

[0072] Al、分别根据当前时隙反馈的码本索引和前一时隙反馈的码本索引获得当前时隙的码本权值和前一时隙的码本权值;[0073] Bi、组合两次的权值得到最终的码本加权向量。 [0072] Al, respectively codebook weights and codebook weights previous slot of the current slot according to the current codebook index feedback slot and the previous slot feedback codebook index; [0073] Bi, a combination of two the right time is worth to the final codebook weight vector.

[0074] 如果信道变化较快,则仅用当前反馈的码本索引对应的码本组中的第一个权值作为加权向量。 [0074] If the channel changes quickly, only the right first feedback current codebook index corresponding to the code values ​​in this group as a weight vector.

[0075] (2)如果接收方采用按照不同可靠性要求对码本反馈,则按照下述步骤进行: [0075] (2) If the receiver uses the feedback codebooks, in accordance with the following procedures different reliability requirements:

[0076] A2、首先从控制信道解读出一层的码本索引,并获得其码本; [0076] A2, the first interpretation from the control channel layer of codebook index, and obtain the codebook;

[0077] B2、根据每个RB的码本索引,获得每个RB的二层码本; [0077] B2, each RB according to the codebook index, codebook Layer obtained for each RB;

[0078] C2、用每个RB的二层码本对一层码本进行处理,得到每个RB最终的码本加权向量。 [0078] C2, a layer of Layer codebook treated with each RB codebook, each RB to give a final weight vector codebook.

[0079] 本发明基于码本分层的设计思想,提出了一种可以和单层码本兼容的分层码本设计方法,并提供了两种码本反馈方案,可以在不增加系统反馈开销的情况下,通过前后反馈信息的组合或将反馈信息与非反馈信息进行运算得到精确的信道信息。 [0079] The present invention is based on hierarchical codebook design, and can propose a compatible single codebook hierarchical codebook design methods, and provides two codebook feedback scheme, may not increase the feedback overhead system in the case where, before and after a combination of feedback information by the feedback information or feedback information to the non-operational channel information accurate. 在信道变化周期远远大于反馈周期的情况下,通过分层反馈可以较大程度地提高信道信息精度。 In case that a channel change period is much greater than the feedback period, feedback may considerably improve the accuracy of the channel information by layering. 而在信道变化周期与反馈周期相当的情况下,该方法又可变为单层码本设计,保证反馈信道信息的有效性。 In the comparable period of the feedback channel variation situation period, which in turn becomes a single codebook design, to ensure the effectiveness of the feedback channel information. 例如:假设每个天线的信道H按照4个量化值分析,这时从象限图分析,已可以认为这是一种最粗糙的量化颗粒度,即便如此4根天线单流情况下共可以产生256个码本,而按照4-bit反馈开销要求分析,普通的单层码本设计方案仅仅设计16个码本,很容易发现后者其量化误差是很大的。 For example: Suppose the channel for each antenna 4 H quantized values ​​according to the analysis, this time from Quadrant analysis, it has been considered one of the most coarse quantization granularity, even such a case where four antennas single stream may be generated a total of 256 codebook, whereas according to the 4-bit feedback overhead requirements analysis, Common single codebook design schemes are merely present design 16 yards, it is easy to find which quantization error is great.

[0080] 当然,本发明还可有其他多种实施例,在不背离本发明精神及其实质的情况下,熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形,但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 [0080] Of course, the present invention may have various other embodiments without departing from the spirit and the essence of the present invention, those skilled in the art can make various corresponding modifications and variations according to the present invention, but these corresponding changes and variations should fall within the scope of the appended claims.

Claims (11)

  1. 1. 一种多输入多输出系统预编码的码本设计及反馈方法,涉及所述多输入多输出系统的信号发射方和信号接收方,其特征在于,所述方法步骤为:(a)设计向上兼容的分层码本,根据码本的反馈开销要求对所述码本进行分层量化处理,亦即将所述码本按层分组,每一层包括多个组,每一组包括多个码本,且下一层码本的第一个元素为上一层码本量化情况下的取值;(b)所述信号接收方计算反馈码本的索引,并选择码本反馈方式分层反馈所述码本的索引。 A MIMO pre-coding system and a feedback codebook design method relating to the MIMO system, a signal transmitter and the signal receiver, characterized in that the method steps of: (a) Design upward compatible hierarchical codebook, codebook feedback overhead in accordance with the requirements of the stratified quantization codebook, the codebook that is grouped in layers, each layer comprising a plurality of groups, each group comprising a plurality of codebook, and the first element of the next layer codebook quantization for the case where the present value of the code on one; (b) said feedback signal receiver calculates codebook indices, and codebook feedback mode select stratified the feedback codebook index.
  2. 2.按照权利要求1所述的方法,其特征在于,步骤(a)设所述反馈开销为η个bit,且所述码本的分层数目为k,所述按层分组即依层次地分组:第一层将On)k个码本分为2"个组,每组包括On) Η个码本;第二层继续将每组所述On) η个码本分为2n个组,......,直至第k层的每组中的码本个数为1个。 2. The method according to claim 1, wherein step (a) is provided as the feedback overhead a η 'bit, and the number of hierarchical codebook is k, i.e. by the packet layer by hierarchically group: On the first layer) is divided into K codebooks 2 "groups, each comprising On) [eta] codebooks; On continuing to each of the second layer) [eta] codebooks are divided into 2n groups, ...... until the k-th layer, the number of codebooks in each set is one.
  3. 3.按照权利要求2所述的方法,其特征在于,步骤(a)对于对等分层码本的设计,所述下一层的码本与所述上一层具有相等的地位,不同所述层表示所述码本的不同分量;对于非对等分层码本的设计,所述下一层码本是对上一层量化误差的进一步量化。 3. The method according to claim 2, wherein step (a) for peer hierarchical codebook design, a codebook of the lower layer of the upper layer have equal status, the different code representing the said layer of different components present; for non-equivalence hierarchical codebook design, the next layer is a layer codebook quantization error is further quantized.
  4. 4.按照权利要求1至3任一项所述的方法,其特征在于,步骤(b)所述码本反馈方式包括以下的一种或多种:(1)交叉方式的码本反馈,适用于对等分层码本的反馈,亦即将多层码本依时隙交错地轮询反馈,即当前时隙反馈第一层码本,则依次在下一时隙反馈下一层码本;不同层的所述码本具有相等的可靠性要求;(2)按照不同可靠性要求对码本反馈,适用于非对等分层码本的反馈,亦即将可靠性要求最高的所述层的码本通过控制信道反馈,对其它可靠性要求较低的所述层的码本通过数据信道反馈;(3)结合部分反馈和相关运算方式的码本反馈,亦即收发双方结合不同层码本之间的关系,将反馈层的码本和本地存储的非反馈层的码本通过函数运算获得最终的预编码加权值码本。 4. The method according to claim 1 to any 3, wherein step (b) said feedback codebook embodiment comprises one or more of: a code (1) of the present embodiment crossing feedback, applicable in other hierarchical codebook for feedback, i.e., the multilayer codebook feedback by polling slot interlace, i.e., a first layer of the current slot codebook feedback, the feedback sequentially next lower hierarchy codebook slot; different layers of the codebook having equal reliability requirements; (2) according to different requirements of reliability codebook feedback, and other suitable non-hierarchical codebook for feedback, i.e., codebook reliability the highest layer through the feedback channel, other reliability of the lower layer codes present on the data channel feedback; (3) binding portion of the feedback and a code correlation operation of the present embodiment the feedback, i.e., send and receive both the bond between the different layers codebook relationship, the code layer of the non-feedback codebook feedback layer and the local storage according to obtain the final value of the precoding codebook by weighting function operation.
  5. 5.按照权利要求4所述的方法,其特征在于,所述码本反馈方式(3)进一步包括以下方式的一种或两种:(3A)每次仅反馈其中的一层码本,用于对本地保存的码本进行修正,而第一层码本用于对本地码本进行初始化;(3B)每次反馈码本时,用一个bit表示当前码本是对上一层码本进行修正还是更换, 用剩余的bit表示用于所述修正或所述更换的码本的索引;所述对上一层码本进行修正, 是指反馈比当前层更低层的码本,所述更低层的码本是对前一层码本的细化或对前一层码本的修正;所述对上一层码本进行更换,是指在下一时隙所述信号接收方发现前后码本变化较大时,不再对上一层进行所述细化或所述修正,而从上一层重新选择一个码本。 The method according to claim 4, wherein the codebook feedback scheme (3) further comprises one or both of the following ways: (3A) wherein each feedback only one codebook with locally stored in a codebook for correction, a first layer of the codebook is used to initialize the local codebook; (3B) each time the feedback codebook, with a bit representing the current codebook is a codebook of upper layer correction or replacement, for showing the correction or replacement of the codebook index with the remaining 'bit; the upper hierarchy codebook correction means lower layer than the current feedback codebook layer, the more low-level codebook is a codebook of the previous layer before correction or refinement level codebook; the upper layer of the codebook replacement, front refers to the signal receiver in a next time slot discovery codebook change large, no longer carried out on a layer of said refined or corrected, re-selecting a codebook from a layer.
  6. 6.按照权利要求4所述的方法,其特征在于,如果采用所述码本反馈方式(1),则所述方法还包括步骤:(bl)根据上一次反馈的所述码本的索引对应的层号i,计算当前应该反馈的层号mod[(i+l),k],其中mod[]为取模函数,所述k为所述码本的分层数目;(b2)根据当前时隙的信道的分解值,并结合上一次的反馈结果,提取当前层对应的分量,并匹配一个最为接近的码本对应的索引进行反馈。 6. The method according to claim 4, wherein, if the feedback codebook mode (1), the method further comprising the step of: (bl) in accordance with a feedback on the codebook index corresponds to layer number i, to calculate the current to be fed back layer number mod [(i + l), k], where MOD [] is the modulo function, k is the number of the code of the present layered; (B2) according to the current value decomposition of a channel slot, and a feedback result of binding, extracted components corresponding to the current layer, and a closest matching codebook index corresponding feedback.
  7. 7.按照权利要求4所述的方法,其特征在于,如果采用所述码本反馈方式0),则所述方法还包括步骤:(bl)根据当前时隙的信道进行分解,得到所述信道权值分量,并用所述信道权值分量与第一层码本匹配,得到所述时隙第一层码本的索引;(b2)分别计算各个资源块RB范围内信道的平均值对应的分解量,计算获得的所述分解量与第一层码本索引对应的码本的量化误差匹配,并将所述量化误差的进一步量化值与其它层码本进行匹配,得到所述各个RB中的其它层码本的索引;(b3)将所述第一层的码本索引置于所述控制信道进行传输,将所述各个RB中的其它层码本的索引分别置于上行业务信道进行传输。 7. The method according to claim 4, wherein, if the feedback codebook mode 0), the method further comprising the step of: (bl) decomposition according to the current slot of the channel, the channel to obtain weight component, and the channel with the right values ​​of the components of the first channel layer matching codebook, codebook index of the obtained time slot of the first layer; (B2) respectively corresponding to the average value calculated for each resource block RB range channel decomposition the amount of the decomposition amount obtained by calculation with the first layer of the codebook index corresponding to the matching codebook quantization error and said quantization error is further quantized according to the code to match with other layers, in each RB to give the other codebook index layer; (B3) the code of the first layer of the present index on the control channel for transmission in the other layers each RB codebook index were placed uplink traffic channel transmission .
  8. 8.按照权利要求4所述的方法,其特征在于,如果统计得到的信道的相干时间与反馈周期相当,则仅计算第一层码本,并与各组中的第一个码本对应的索引分别匹配,所述信号接收方每次仅反馈所述第一层码本的索引;如果统计得到的信道的相干时间远大于反馈周期,则按照所述码本反馈方式(1)或方式(¾或方式C3)进行反馈。 8. The method according to claim 4, wherein, if the counted coherence time of the channel and the feedback period equivalent to only the first layer codebook is calculated, and with each group corresponding to a first codebook index matching, respectively, only the feedback signal receiver each codebook index of the first layer; if the coherence time of the channel is much larger than the counted feedback period, a feedback mode according to the codebook (1) or method ( ¾ way or C3) feedback.
  9. 9.按照权利要求1所述的方法,其特征在于,所述方法还包括步骤(c)所述信号发射方根据所述码本反馈方式对码本权值进行计算。 9. The method according to claim 1, wherein said method further comprises the step (c) of the signal transmitting side calculates weight according to a codebook the codebook feedback scheme.
  10. 10.按照权利要求9所述的方法,其特征在于,如果所述信号接收方采用交叉方式的码本反馈,则所述对码本权值进行计算包括步骤:(cl)分别根据当前时隙反馈的码本索引和前一时隙反馈的码本索引获得所述当前时隙的码本权值和所述前一时隙的码本权值;(c2)组合所述当前时隙的码本权值和所述前一时隙的码本权值得到最终的码本加权向量;其中,交叉方式的码本反馈,适用于对等分层码本的反馈,亦即将多层码本依时隙交错地轮询反馈,即当前时隙反馈第一层码本,则依次在下一时隙反馈下一层码本;不同层的所述码本具有相等的可靠性要求。 10. The method according to claim 9, wherein, if the signal receiver a crossover mode feedback codebook, said codebook comprising weight calculating step of: (cl), respectively, according to the current time slot feedback codebook index and the previous slot feedback codebook index codebook weights to obtain the current codebook weights and the front slot of a time slot; (C2) combining the right time slot of the current codebook value and the codebook weights to the previous slot worth final weighted codebook vector; wherein the code of the present embodiment the cross feedback, applicable to other hierarchical codebook for feedback, i.e. by the multilayer codebook slot interlace polling the feedback, i.e., a first layer of the current slot codebook feedback, the feedback sequence in the next time slot one codebook; the codes of different layers present having equal reliability requirements.
  11. 11.按照权利要求9所述的方法,其特征在于,如果所述信号接收方采用按照不同可靠性要求对码本反馈的方式进行码本反馈,则所述对码本权值进行计算包括步骤:(cl)通过从控制信道解读所述层的码本索引获得所述层的码本; (c2)根据每个资源块RB的码本索引,获得每个所述RB的其它层码本; (c3)用每个所述RB的码本对所述层码本进行处理,得到每个所述RB其它层的码本并计算加权向量;其中,按照不同可靠性要求对码本反馈,适用于非对等分层码本的反馈,亦即将可靠性要求最高的所述层的码本通过控制信道反馈,对其它可靠性要求较低的所述层的码本通过数据信道反馈。 11. The method according to claim 9, wherein, if the signal receiver of the embodiment using the codebook feedback is performed according to different reliability requirements codebook feedback, the codebook is calculated weights comprises the step of : (cl) obtaining a codebook layer by layer according to the reading frame from the control channel index; (C2) each RB according to a codebook index, codebook is obtained for each of the other layers of the RB; (c3) the layer codebook with the codebook each RB is to give each of the other layers RB codebook and calculates a weighting vector; wherein, according to the different requirements of reliability codebook feedback, applicable and the like in a non-hierarchical codebook for feedback, i.e., the reliability of the code of the highest layer of the present feedback control channel, the reliability requirements of the other codes of the lower layer of the data channel feedback present.
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