CN101997584B - Method, system and device for determining code word - Google Patents
Method, system and device for determining code word Download PDFInfo
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Abstract
The embodiment of the invention relates to a wireless communication technique and particularly relates to a method, a system and a device for determining a code word. The invention aims at maintaining lower expense and improving system performance. The method in the embodiment comprises the following steps of: selecting a leaf node corresponding to the ith subband from a leaf node set by a receiver according to the channel state information of the ith subband, wherein the leaf node set is formed by leaf nodes determined by a root node which is the code word corresponding to the (i-1)th subband; determining the position information of the quantized channel information of the ith subband in the code word according to the code word in the selected leaf node; and transmitting position information to an emitter for instructing the emitter to determine the code word corresponding to the ith subband according to the position information, wherein the position information instructs the position of the quantized channel information corresponding to the ith subband in the corresponding tree-shaped subcode book, wherein i is a positive integer larger than 2.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of mthods, systems and devices of definite code word.
Background technology
MIMO (Multiple Input Multiple Output, multiple-input, multiple-output) system uses a plurality of transmitting antennas and a plurality of reception antenna, utilize signal sky, the time, frequency-domain combined processing obtains speed, diversity and array gain.
In mimo system, if transmitter can be known channel information, just can be optimized transmitted signal according to the characteristic of channel, to improve the quality of reception and reduction to the requirement of Receiver Complexity.
At present, need by the receiver feedback channel information.Adopt the feedback of channel information mode that quantizes in real system, to reduce feedback overhead and feedback delay.The quantification of channel information can for channel matrix and statistic thereof, can be also the pretreatment parameter of receiver recommendation.Channel information is mapped in the set of limited element formation through after quantizing, and this set is called code book.
At Rel-8 LTE (Long Term Evolution, Long Term Evolution) adopted pre-coding matrix label (PMI) feedback mechanism in transmission mode 4,5,6, be that receiver is measured channel according to public guide frequency, and report the label corresponding to pre-coding matrix of its recommendation to transmitter.In Rel-10 LTE (LTE-Advanced, long-term evolution upgrading) system, can continue to use the mechanism of PMI feedback, but due to the increase (8 of maximum possible) of number of transmit antennas, the size of code book can further expand.
Due to channel in time, frequency fluctuates, for the preliminary treatment that makes transmitter and the variation of channel are complementary, receiver needs the channel information on timely each frequency location of feedback, so feedback quantity will significantly increase along with the increase of bandwidth.For example in Rel-8 LTE, system bandwidth is divided into some subbands, and receiver need to report the PMI (each PMI takies 4bit) of each subband.The supposing the system bandwidth is 10MHz, takies 50 RB (Resource Block, Resource Block), and this moment, the subband size was 6RB, need to report
PMI.If introduce the code book of 6bit or 8bit, the PMI feedback quantity under the many PMI feedback model of broadband will reach respectively 54 and 72bit.
In order to reduce feedback overhead, can adopt the differential codebook mode.Concrete, select a plurality of code words (being pre-coding matrix) as the subtree root from codeword set (being the pre-coding matrix set), then according to and the position relationship of subtree root in codeword set, select a plurality of code words as the leaf node of a sub-tree root from all the other code words, each subtree root is selected the leaf node of self in the manner described above again.
Then receiver is according to the channel information of a subband, determine the root node (number of words comprises a root node and some leaf nodes) of a subtree, and then select leaf node according to the channel information of other subbands from leaf node corresponding to the root node of this subtree.
At last, the information that is used for expression leaf node and root node position relationship that the leaf node of the code word that root node is corresponding and selection is corresponding sends to transmitter; Transmitter just can be determined which code word in the corresponding codeword set of each subband according to these information.
As shown in Figure 1, each element that comprises in CB1 is a root node, each element that comprises in CB2 is leaf node, wherein A1～A4 is the leaf node of A, suppose receiver selection A, all the other subbands can only be selected from A1～A4, and such as having selected A1 and A2, the code word label that receiver is corresponding with A and A1 and A2 send to transmitter to get final product at relative position information corresponding to set A 1～A4.
The supposing the system bandwidth is divided into N subband, and this moment, the quantized channel information bit number of required feedback was: (N-1) l+B
1And when using conventional code book, need feedback NB
0Use in the differential feedback mode of multi-stage codebooks, the feedback quantity of receiver mainly concentrates in the indication of code word of certain subset (certain subtree leaf node) to the secondary code book.And in the code book design process, the quantity of each subtree leaf node is far smaller than stepless code book, so this mode can reduce feedback overhead.
The feedback quantity of this mode is mainly the differential information between code word in a subtree.After having determined a sub-tree root, the indication information that all the other subbands are corresponding is all selected in the leaf node under this word tree root, if system bandwidth is large or frequency selectivity is stronger, can cause the discrepancy of channel quality of the larger subband of the indication information of selection and frequency interval larger, make the code word of receiver feedback can not be well and channel matched, thereby can cause the loss of performance.
In sum, adopt at present differential codebook mode feedback channel information, if system bandwidth is larger, make the code word of receiver feedback can not be well and channel matched, thereby can cause systemic loss of energy.
Summary of the invention
The embodiment of the present invention provides a kind of mthods, systems and devices of definite code word, in order to when system bandwidth is larger, can make code word and the channel matched of receiver feedback, thereby can improve systematic function in the lower expense of maintenance.
The method of a kind of definite code word that the embodiment of the present invention provides, the method comprises:
Receiver is according to the channel condition information of i subband, select i the leaf node that subband is corresponding from the leaf node set of tree-like sub-codebook, wherein said leaf node set be code word that i-1 subband is corresponding as root node, and the set that forms according to the leaf node that this root node is determined;
Described receiver is according to the code word in the leaf node of selecting, determine the positional information of quantized channel information in code book of i subband, and send described positional information to transmitter, be used to indicate described transmitter and determine i the code word that subband is corresponding according to described positional information;
Wherein, described positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication; I is the positive integer greater than 2.
The system of a kind of definite code word that the embodiment of the present invention provides, this system comprises:
receiver, be used for the channel condition information according to i subband, select i the leaf node that subband is corresponding from the leaf node set of tree-like sub-codebook, according to the code word in the leaf node of selecting, determine the positional information of quantized channel information in code book of i subband, and send described positional information to transmitter, wherein said leaf node set is that code word that i-1 subband is corresponding is as root node, and the set of the leaf node composition definite according to this root node, described positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication, i is the positive integer greater than 2,
Transmitter is used for determining i the code word that subband is corresponding according to described positional information.
A kind of receiver that the embodiment of the present invention provides, this receiver comprises:
Select module, be used for the channel condition information according to i subband, select i the leaf node that subband is corresponding from the leaf node set of tree-like sub-codebook, and according to the code word in the leaf node of selecting, determine the positional information of quantized channel information in code book of i subband, wherein said leaf node set be code word that i-1 subband is corresponding as root node, and the set that forms according to the leaf node that this root node is determined;
Sending module is used for sending described positional information to transmitter, is used to indicate described transmitter and determines i the code word that subband is corresponding according to described positional information;
Wherein, described positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication; I is the positive integer greater than 2.
A kind of transmitter that the embodiment of the present invention provides, this transmitter comprises:
Receiver module be used for to receive from the quantized channel information of the receiver positional information at code book;
Determination module is used for according to the code word of i-1 subband and described positional information corresponding to i subband of receiving, determines i the code word that subband is corresponding from described tree-like sub-codebook,
Wherein, described positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication, and i is the positive integer greater than 2.
Embodiment of the present invention receiver is according to the channel condition information of i subband, from the leaf node set, select i the leaf node that subband is corresponding, wherein the leaf node set is that code word that i-1 subband is corresponding is as root node, and the set of the leaf node composition definite according to this root node, i is the positive integer greater than 2; Receiver is determined the positional information of i subband according to the code word in the leaf node of selecting, and sends positional information to transmitter.Due to the Nested property of utilizing tree-like sub-codebook structure, the channel information quantized value that guarantees i subband is selected from a plurality of code words relevant to the channel status of i-1 subband, when system bandwidth is larger, can make code word and the channel matched of receiver feedback, thereby can improve systematic function in the lower expense of maintenance.
Description of drawings
Fig. 1 is the structural representation of multi-stage codebooks in background technology;
Fig. 2 is the system configuration schematic diagram that the embodiment of the present invention is determined code word;
Fig. 3 is the structural representation of the tree-like sub-codebook of the embodiment of the present invention;
Fig. 4 is the structural representation of embodiment of the present invention receiver;
Fig. 5 is the structural representation of embodiment of the present invention transmitter;
Fig. 6 is the method flow schematic diagram that embodiment of the present invention the first is determined code word;
Fig. 7 is the method flow schematic diagram that embodiment of the present invention the second is determined code word.
Embodiment
Embodiment of the present invention receiver is according to the channel condition information of i subband, from the leaf node set, select i the leaf node that subband is corresponding, wherein the leaf node set is that code word that i-1 subband is corresponding is as root node, and the set of the leaf node composition definite according to this root node, i is the positive integer greater than 2; Receiver is determined the positional information of quantized channel information in code book of i subband according to the code word in the leaf node of selecting, and sends positional information to transmitter.Due to the Nested property of utilizing tree-like sub-codebook structure, guarantee in the channel information quantized value word selection of i subband a plurality of code words relevant to the channel status of i-1 subband, when system bandwidth is larger, can make code word and the channel matched of receiver feedback, thereby can improve systematic function in the lower expense of maintenance.
Wherein, the embodiment of the present invention changes the multi-stage codebooks in the background technology of Fig. 1, form a plurality of tree type sub-codebooks, each tree type sub-codebook comprises a root node and a plurality of leaf node, and have nest relation between tree type sub-codebook, each tree type sub-codebook can store into respectively in transmitter and receiver; Also can store in other entities, call for transmitter and receiver.
Specifically can two tree type sub-codebooks be arranged in Fig. 3 referring to Fig. 3, wherein the code word in a leaf node of the code word in the root node of second tree type sub-codebook and first tree-like sub-codebook is identical.
That is to say that each leaf node of first tree type sub-codebook all as other root node, is then determined leaf node under this root node according to the code word in root node.
Concrete, the tree code book with Nested property can produce in the following manner:
With the tree root of each code word in the single-stage code book as a tree, to each root vertex, choose self and have with it a group code word of minimum range as its leaf node.
Because subband has correlation, thus according in this nest relation of tree-like sub-codebook, determine the code word of each subband, thus can make code word and the channel matched of receiver feedback.
A code word in the embodiment of the present invention is exactly a pre-coding matrix, and positional information is exactly quantized channel information value of feedback.
In specific implementation process, the content in root node and leaf node can be code word, also can be with code word as root node and leaf node.
Unless specified otherwise otherwise positional information in the embodiment of the present invention is all the positional information of quantized channel information in code book.
Below in conjunction with Figure of description, the embodiment of the present invention is described in further detail.
As shown in Figure 2, the embodiment of the present invention determines that the system of code word comprises: receiver 10 and transmitter 20.
Wherein, the leaf node set be code word that i-1 subband is corresponding as root node, and the set that forms according to the leaf node that this root node is determined; Positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication; I is the positive integer greater than 2.
Indicate the position of quantized channel information in code book of first subband for the positional information of first subband.
Wherein, system bandwidth is divided into several subbands, and receiver 10 and transmitter 20 are determined the order of each subband according to the sortord of setting.
Store into respectively after sortord can artificially be set in receiver 10 and transmitter 20, determine after also can being consulted by receiver 10 and transmitter 20.
Concrete sortord includes but not limited to a kind of in following order:
Frequency location according to subband sorts from big to small;
Frequency location according to subband sorts from small to large.
Receiver 10 sequentially is the subband sequence according to the subband of determining, then sequentially send the positional information of quantized channel information in code book corresponding to subband according to this, wherein can determine all to send in order again after the positional information (PMI that comprises first subband) of all subbands, also can determine just to send one after a positional information;
Accordingly, transmitter 20 just can be determined corresponding which subband of this positional information according to the order of the positional information of receiving.
Also have a kind of mode can be each allocation of subbands sign, then add the sign of corresponding subband in positional information;
Accordingly, transmitter 20 just can be known corresponding which subband of the positional information of this quantized channel information in code book according to sign.
In specific implementation process, receiver 10 is for first subband, need to be according to the channel condition information of first subband, and select the code word of a root node as code word corresponding to first subband from the code word of the root node of all tree-like sub-codebooks.
Select the mode of code word to have according to channel condition information a variety of, for example according to maximum channel capacity criterion, selected code word can make the equivalent channel after precoding have maximum channel capacity.
After receiver 10 has been determined the code word of first subband, determine the PMI that this code word is corresponding.
Accordingly, the code word of the 4th subband be from the root node identical with the code word of the 3rd subband select remaining leaf node, the like, do not repeat them here.
That is to say, as content root node, and select a leaf node in the leaf node of determining according to this root node from code word corresponding to i-1 subband, and with the code word of the code word in the leaf node of selecting as i subband.
As shown in Figure 3, the code word of first subband is A, selects B as the code word of second subband from all leaf nodes of A, then selects C as the code word of the 3rd subband from all leaf nodes of determining take B as root node, the like.
This method embodiment can be according to the variation of channel, and the code word during with quantification expands in all code words goes.In Fig. 3 after the channel information quantized result of known previous subband, the channel information quantized value of current subband will with on choose in a maximally related secondary codebook subset of sub-band channel information quantization value.This feedback method has been considered the correlation of channel between subband, except feeding back B to first subband
0Outside bit, remaining subband all only needs feedback to be used for characterizing l bit of certain subtree leaf node, and feedback quantity altogether is (N-1) l+B
1, wherein N is that number of sub-bands, 1 is the bit number that the needed bit number of positional information, B1 need to feed back for first subband.
Utilize the Nested property of codebook structure, the channel information quantized value of subband i is chosen from the most relevant to the channel status of subband i-1 2
lAmong individual code word, rather than within quantitative information being limited to a subtree centered by the quantized value of subband 1 as the differential feedback method of introducing in background technology, thereby can travel through whole code book, and due to correlation being arranged between filial generation, the code word of a rear subband is to select the leaf node of determining as root node from the code word of last height band, thereby can guarantee that the code word of feeding back can be good at mating with channel.
In the tree-like sub-codebook of introducing in the above, the code word in the root node of arbitrary tree-like sub-codebook must be subordinated to the leaf node set of other tree-like sub-codebook; Arbitrary leaf node must be the root node of the tree-like sub-codebook of another one.
For code word and the channel that further makes feedback can be good at coupling, can also make arbitrary root node is also a leaf node of this tree-like sub-codebook self.
That is to say, the code word in the root node under the code word of a leaf node in the leaf node set and this leaf node set is identical.
In Fig. 3, in the tree-like sub-codebook of A as root node, there is the code word in leaf node identical with code word A in all leaf nodes.
The benefit of doing like this is, if the correlation of two subbands is very strong, the code word that two subbands can occur is all identical, like this can be better and channel matched.
Code word for next subband can continue to select the leaf node below A.
Because certain code word in PMI and code book is corresponding one by one, so transmitter can uniquely according to the PMI of feedback be determined code word corresponding to this PMI.
After the code word of having determined first subband, search the root node identical with this code word, and according to the positional information of first quantized channel information in code book of receiving, determine a leaf node leaf node under the root node that finds, and with the code word of the code word in the leaf node of determining as second subband;
The mode of follow-up definite other subband code words is similar with the mode of the code word of determining second subband, does not repeat them here.
Wherein, the receiver of the embodiment of the present invention can be user terminal, can be also other equipment of user's side; The transmitter of the embodiment of the present invention can be the base station, can be also other equipment of network side.
As shown in Figure 4, embodiment of the present invention receiver comprises: select module 100 and sending module 110.
Sending module 110 is used for sending the quantification channel information in the positional information of code book to transmitter, is used to indicate transmitter and determines i the code word that subband is corresponding according to positional information;
Wherein, positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication; I is the positive integer greater than 2.
Wherein, the receiver of the embodiment of the present invention can further include: order module 120.
Sortord in embodiment of the present invention receiver and the embodiment of the present invention determine that the sortord in the system of code word is similar, do not repeat them here.
Wherein, sending module 110 sends positional information corresponding to subband according to the order after sorting, wherein can select module 100 to determine all to send in order again after the positional information (PMI that comprises first subband) of quantized channel information in code book of all subbands, also can select module 100 to determine just to send one after a positional information.
Also having a kind of mode is order module 120 each allocation of subbands sign (specifically corresponding which sign of which subband can artificially be stipulated or be consulted to determine with transmitter 20), then selects module 100 to add the sign of corresponding subband in positional information.
In specific implementation process, select module 100 for first subband, need to be according to the channel condition information of first subband, select the code word of a root node as code word corresponding to first subband from the code word of the root node of all tree-like sub-codebooks; After having determined the code word of first subband, select module 100 to determine PMI corresponding to this code word; After the code word of having determined first subband, select module 100 according to the channel condition information of second subband, select the code word of a leaf node as code word corresponding to first subband the code word of all leaf nodes under the root node of selecting; Then according to the code word of second subband and the position relationship (be the position relationship of root node and the leaf node chosen) of code word in tree-like sub-codebook of first subband, determine the label corresponding to quantized channel information of second subband; Code word according to second subband, look for a root node identical with the code word of second subband from tree-like sub-codebook, then according to the channel condition information of the 3rd subband, select a leaf node all leaf nodes under this root node, and with the code word of the code word in the leaf node of selecting as the 3rd subband.
The code word of the 4th subband be from the root node identical with the code word of the 3rd subband select remaining leaf node, the like, do not repeat them here.
In the tree-like sub-codebook of introducing in the above, the code word in the root node of arbitrary tree-like sub-codebook must be subordinated to the leaf node set of other tree-like sub-codebook; Arbitrary leaf node must be the root node of the tree-like sub-codebook of another one.
For code word and the channel that further makes feedback can be good at coupling, can also make arbitrary root node is also a leaf node of this tree-like sub-codebook self.
That is to say, the code word in the root node under the code word of a leaf node in the leaf node set and this leaf node set is identical.
As shown in Figure 5, embodiment of the present invention transmitter comprises: receiver module 200 and determination module 210.
Wherein, positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication, and i is the positive integer greater than 2.
The mode of follow-up definite other subband code words is similar with the mode of the code word of determining second subband, does not repeat them here.
As shown in Figure 6, embodiment of the present invention the first determines that the method for code word comprises:
Indicate the position of quantized channel information in code book of first subband for the positional information of first subband.
Wherein, can further include before step 601:
Step 600, receiver according to the frequency location of subband by height on earth or order from low to high all subbands are sorted.
In specific implementation process, system bandwidth is divided into several subbands, and Receiver And Transmitter is determined the order of each subband according to the sortord of setting.
Store into respectively in Receiver And Transmitter after sortord can artificially be set, determine after also can being consulted by Receiver And Transmitter.
Concrete sortord includes but not limited to a kind of in following order:
Frequency location according to subband sorts from big to small;
Frequency location according to subband sorts from small to large.
In step 600, receiver sequentially is the subband sequence according to the subband of determining, then receiver sequentially sends positional information corresponding to subband according to this, wherein receiver can be determined all to send in order after the positional information (PMI that comprises first subband) of all subbands again, also can determine just to send one after a positional information;
Accordingly, transmitter just can be determined corresponding which subband of this positional information according to the order of the positional information of receiving.
Also have a kind of mode receiver can be each allocation of subbands sign, then add the sign of corresponding subband in positional information;
Accordingly, transmitter just can be known corresponding which subband of this positional information according to sign.
In step 601, receiver is for first subband, need to be according to the channel condition information of first subband, and select the code word of a root node as code word corresponding to first subband from the code word of the root node of all tree-like sub-codebooks.
Select the mode of code word to have according to channel condition information a variety of, for example according to maximum channel capacity criterion, selected code word can make the equivalent channel after precoding have maximum channel capacity.
After receiver has been determined the code word of first subband, determine the PMI that this code word is corresponding.
Receiver according to the channel condition information of second subband, selects the code word of a leaf node as code word corresponding to first subband after the code word of having determined first subband the code word of all leaf nodes under the root node of selecting; Then according to the code word of second subband and the position relationship (be the position relationship of root node and the leaf node chosen) of code word in tree-like sub-codebook of first subband, determine the quantized channel information of second subband.
Receiver is according to the code word of second subband, look for a root node identical with the code word of second subband from tree-like sub-codebook, then according to the channel condition information of the 3rd subband, select a leaf node all leaf nodes under this root node, and with the code word of the code word in the leaf node of selecting as the 3rd subband.
Accordingly, the code word of the 4th subband be from the root node identical with the code word of the 3rd subband select remaining leaf node, the like, do not repeat them here.
That is to say, as content root node, and select a leaf node in the leaf node of determining according to this root node from code word corresponding to i-1 subband, and with the code word of the code word in the leaf node of selecting as i subband.
In the tree-like sub-codebook of introducing in the above, the code word in the root node of arbitrary tree-like sub-codebook must be subordinated to the leaf node set of other tree-like sub-codebook; Arbitrary leaf node must be the root node of the tree-like sub-codebook of another one.
For code word and the channel that further makes feedback can be good at coupling, can also make arbitrary root node is also a leaf node of this tree-like sub-codebook self.
That is to say, the code word in the root node under the code word of a leaf node in the leaf node set and this leaf node set is identical.
In Fig. 3, in the tree-like sub-codebook of A as root node, there is a code word in leaf node identical with code word in A in all leaf nodes.
The benefit of doing like this is exactly, if the correlation of two subbands is very strong, the code word that two subbands can occur is all identical, like this can be better and channel matched.
Code word for next subband can continue to select the leaf node below A.
Wherein, can further include after step 602:
Step 603, transmitter are determined i the code word that subband is corresponding according to the code word of i-1 subband and i the positional information that subband is corresponding of receiving from tree-like sub-codebook.
Concrete, transmitter can first be received PMI according to the reception order, then determines the code word of first subband according to PMI.
After the code word of having determined first subband, search the root node identical with this code word, and according to first positional information of receiving, determine a leaf node the leaf node under the root node that finds, and with the code word of the code word in the leaf node of determining as second subband;
The mode of follow-up definite other subband code words is similar with the mode of the code word of determining second subband, does not repeat them here.
Wherein, the receiver of the embodiment of the present invention can be user terminal, can be also other equipment of user's side; The transmitter of the embodiment of the present invention can be the base station, can be also other equipment of network side.
The supposing the system bandwidth is 10MHz, takies 50 RB, and the subband size is 6RB, uses the 6bit code book:
According to the feedback system that this method embodiment proposes, suppose that the leaf node of each subtree represents with 3bit, the channel information of initial subband quantizes with 6bit.Required feedback quantity is also altogether
Within but this feedback system was not limited to some subtrees with the quantized value that feeds back, along with the variation of channel, adjacent sub-bands can use different subtrees that channel information is quantized.
As shown in Figure 7, embodiment of the present invention the second determines in the method for code word, and receiver is according to obtaining channel information to measurement or other modes of pilot tone, and adopts differential mode to report the channel information of quantification.
Be fed back to example with frequency domain differential demodulation, receiver calculates the feedback of channel information amount of each subband one by one from certain subband.
Initial condition i=1, i.e. first subband.
The code book that uses due to the invention process has the nest relation of root node and leaf node, FB
2Must be the tree root of certain subtree, therefore for the 3rd subband, will use with FB
2The code book that consists of for the subtree leaf node of subtree root is to SB
3Channel information quantize, obtain the quantized channel information value of feedback of the 3rd subband:
Then, except first subband, other arbitrary subbands are all take the quantized channel information of last subband feedback as the subtree root, and seek the quantized channel information of current subband in the leaf node of this subtree.
Can find out from above-described embodiment: the embodiment of the present invention is according to the channel condition information of i subband, select i the leaf node that subband is corresponding from the leaf node set of tree-like sub-codebook, wherein said leaf node set be code word that i-1 subband is corresponding as root node, and the set that forms according to the leaf node that this root node is determined; Receiver is determined the positional information of quantized channel information in code book of i subband according to the code word in the leaf node of selecting, and sends positional information to transmitter, is used to indicate transmitter and determines i the code word that subband is corresponding according to positional information; Wherein positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication; I is the positive integer greater than 2.
Due to the Nested property of utilizing tree-like sub-codebook structure, guarantee in the channel information quantized value word selection of i subband a plurality of code words relevant to the channel status of i-1 subband, when system bandwidth is larger, can make code word and the channel matched of receiver feedback, thereby can improve systematic function in the lower expense of maintenance;
Further, the embodiment of the present invention can also travel through whole code book when guaranteeing than low-feedback, thereby can well simplify the based on feedback link design according to the variation of channel, and the impact that resource is distributed.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. the method for a definite code word, is characterized in that, the method comprises:
Receiver is according to the channel condition information of i subband, select i the leaf node that subband is corresponding from the leaf node set of tree-like sub-codebook, wherein said leaf node set be code word that i-1 subband is corresponding as root node, and the set that forms according to the leaf node that this root node is determined;
Described receiver is according to the code word in the leaf node of selecting, determine the positional information of quantized channel information in code book of i subband, and send described positional information to transmitter, be used to indicate described transmitter and determine i the code word that subband is corresponding according to described positional information;
Wherein, described positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication; I is the positive integer greater than 2.
2. the method for claim 1, is characterized in that, described receiver also comprises after the described positional information of i subband of transmitter transmission:
Described transmitter is determined i the code word that subband is corresponding according to the code word of i-1 subband and described positional information corresponding to i subband of receiving from described tree-like sub-codebook.
3. the method for claim 1, is characterized in that, the code word in the root node under the code word of a leaf node in described leaf node set and this leaf node set is identical.
4. the described method of claim as arbitrary in claim 1～3, is characterized in that, described receiver is selected also to comprise before leaf node corresponding to subband:
Described receiver according to the frequency location of subband from high to low or order from low to high all subbands are sorted.
5. the system of a definite code word, is characterized in that, this system comprises:
receiver, be used for the channel condition information according to i subband, select i the leaf node that subband is corresponding from the leaf node set of tree-like sub-codebook, according to the code word in the leaf node of selecting, determine the positional information of quantized channel information in code book of i subband, and send described positional information to transmitter, wherein said leaf node set is that code word that i-1 subband is corresponding is as root node, and the set of the leaf node composition definite according to this root node, described positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication, i is the positive integer greater than 2,
Transmitter is used for according to the code word of i-1 subband and described positional information corresponding to i subband of receiving, determines i the code word that subband is corresponding from described tree-like sub-codebook.
6. system as claimed in claim 5, is characterized in that, the code word in the root node under the code word of a leaf node in described leaf node set and this leaf node set is identical.
7. claim as arbitrary in claim 5～6 described system, is characterized in that, described receiver also is used for:
Before selecting leaf node corresponding to subband, according to the frequency location of subband by height on earth or order from low to high all subbands are sorted.
8. a receiver, is characterized in that, this receiver comprises:
Select module, be used for the channel condition information according to i subband, select i the leaf node that subband is corresponding from the leaf node set of tree-like sub-codebook, and according to the code word in the leaf node of selecting, determine the positional information of quantized channel information in code book of i subband, wherein said leaf node set be code word that i-1 subband is corresponding as root node, and the set that forms according to the leaf node that this root node is determined;
Sending module is used for sending described positional information to transmitter, is used to indicate described transmitter and determines i the code word that subband is corresponding according to described positional information;
Wherein, described positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication; I is the positive integer greater than 2.
9. receiver as claimed in claim 8, is characterized in that, the code word in the root node under the code word of a leaf node in described leaf node set and this leaf node set is identical.
10. receiver as claimed in claim 8 or 9, is characterized in that, described receiver also comprises:
Order module was used for before described selection module is selected leaf node corresponding to subband, according to the frequency location of subband by height on earth or order from low to high all subbands are sorted.
11. a transmitter is characterized in that, this transmitter comprises:
Receiver module be used for to receive from the quantized channel information of the receiver positional information at code book;
Wherein, described positional information is i the position of quantized channel information in the tree-like sub-codebook of correspondence that subband is corresponding of indication, and i is the positive integer greater than 2;
Determination module is used for according to the code word of i-1 subband and described positional information corresponding to i subband of receiving, determines i the code word that subband is corresponding from described tree-like sub-codebook.
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| WO2008096997A2 (en) * | 2007-02-05 | 2008-08-14 | Lg Electronics Inc. | Method for transmitting channel quality information based on differential scheme |
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| CN101146078A (en) * | 2006-12-27 | 2008-03-19 | 中兴通讯股份有限公司 | A selection method for multi-input and multi-output space multiplexing pre-coding matrix |
| WO2008096997A2 (en) * | 2007-02-05 | 2008-08-14 | Lg Electronics Inc. | Method for transmitting channel quality information based on differential scheme |
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