CN101848068A - Intermediate code allocation method and device based on multi-user multiple input multiple output technology - Google Patents
Intermediate code allocation method and device based on multi-user multiple input multiple output technology Download PDFInfo
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Abstract
The invention provides intermediate code allocation method and device based on a multi-user multiple input multiple output technology. The allocation method comprises the step of allocating intermediate codes for each space division user in multiple space division users according to the maximal number of available intermediate codes configured by a system, the number of code channels corresponding to spread spectrum code words allocated for the space division user, and the total number of the multiple space division users. The invention overcomes the defect of quality reduction of channel estimation for each space division user due to the interference caused by the same intermediate code allocated for each space division user in a certain spatial separation in the prior art, and improves the quality of channel estimation.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of method and device of distribution of the intermediate code based on multi-user multiple input multiple output technology.
Background technology
Multi-user's multiple-input and multiple-output (Multiple User-Multiple Input MultipleOutput, abbreviating MU-MIMO as) technology is to utilize the space segmentation between different user to constitute different channels, can be so that have the multiplexing identical physical resource of user that certain space is isolated, thus the capacity of mobile communications network improved.
At present, system adopts the default allocation scheme to distribute middle trained sequence code (Mid-amble abbreviates intermediate code as) for each user.The distributed amongst scheme of this acquiescence is that the spreading code (can be called the spread spectrum code word) according to the user distributes intermediate code, and spreading code and intermediate code are to concern one to one.That is, identical spreading code, corresponding intermediate code also is identical.That is to say that if the identical spread spectrum code resources of system multiplexing, then the intermediate code of distributing for the empty user of branch also is identical.During Fig. 1 K=8 of the prior art, the corresponding relation of intermediate code and spreading code under the Default mode, wherein, K represents the maximum spendable intermediate code quantity of system configuration.As shown in Figure 1, wherein, spreading code:
With
Corresponding intermediate code is first number, that is, and and m
(1), each spreading code all has the intermediate code of a correspondence by that analogy.
Based on the intermediate code shown in Figure 1 and the corresponding relation of spreading code, if the user adopts identical spread spectrum code word (that is, this user is the empty user of branch), then the intermediate code of each empty branch user employing is identical.In certain space is isolated, if each empty branch user adopts identical intermediate code, then can interfere with each other between these identical intermediate codes, promptly, be that the intermediate code that an empty user of branch distributes can be subjected to the interference of other empty users' of branch identical intermediate code, thereby cause each empty decline that divides the subscriber channel estimated quality.
At present, isolate the interior empty problem of dividing the decline of subscriber channel estimated quality that causes owing to identical intermediate code is interfering with each other, do not propose effective solution as yet at certain space in the correlation technique.
Summary of the invention
Adopt identical intermediate code and be subjected to the interference of other empty users' of branch intermediate code at the empty user of branch of above-mentioned each in certain space is isolated, thereby cause each emptyly to divide the problem of subscriber channel estimated quality decline and propose the present invention.For this reason, the present invention aims to provide a kind of allocative decision of improved intermediate code based on multi-user multiple input multiple output technology, one of to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of distribution method of the intermediate code based on multi-user multiple input multiple output technology, be used to a plurality of empty users of branch to distribute intermediate code.
Distribution method according to the intermediate code based on multi-user multiple input multiple output technology of the present invention comprises: divide user among a plurality of empty users of branch each is empty, according to the quantity of the maximum spendable intermediate code of system configuration, distribute intermediate code for this sky divides the code channel number of the spread spectrum code word correspondence that the user distributes and a plurality of empty users' of branch total quantity for each empty branch user.
Wherein, divide user to distribute the processing of intermediate code to comprise for each is empty:, to be defined as the total quantity of the intermediate code of a plurality of empty users of branch distribution according to the quantity of the maximum spendable intermediate code of its system configuration with for this sky divides the code channel number of the spread spectrum code word correspondence that the user distributes for each empty user of branch; Be defined as the quantity that each sky divides the intermediate code of user's distribution according to the total quantity of the intermediate code of dividing users' distribution for a plurality of skies and a plurality of empty users' of branch total quantity.
After the quantity of having determined the intermediate code that the empty user of branch distributes for each, said method also comprises: divide the user to distribute corresponding intermediate code for each is empty continuously successively.
Preferably, be defined as the total quantity km_all of the intermediate code of a plurality of empty users of branch distribution according to following formula:
Km_all=[Ncode
Sdma/ (16/K)], wherein, Ncode
SdmaBe expressed as the code channel number of the spread spectrum code word correspondence of each the empty user of branch distribution, K represents the quantity of the maximum spendable intermediate code of system configuration.
Preferably, be defined as the quantity km of the intermediate code of each the empty user of branch distribution according to following formula:
Km=[km_all/N
Sdma], wherein, km_all is expressed as the total quantity of the intermediate code of a plurality of empty users of branch distribution, N
SdmaThe total quantity of representing a plurality of empty users of branch.
Above-mentionedly divide user to distribute the processing of the intermediate code of respective numbers to comprise: the sequence number of intermediate code that is defined as a plurality of empty users' of branch i the empty user of branch distribution according to following formula: [(i-1) * km+m] to [i*km+m-1] for each is empty, wherein, km is expressed as the quantity of the intermediate code of each the empty user of branch distribution, and m represents the intermediate code sequence number of the initial code channel correspondence of the empty user of branch.
If the one or more skies among a plurality of empty users of branch divide the user to support single user's Multiple Input Multiple Output, then after distributing intermediate code for one or more empty branch users, method also comprises: for one or more empty each of dividing among the users, will distribute to the intermediate code that intermediate code that this sky divides the user is divided into the intermediate code that is used for main transmission block and is used for auxilliary transmission block according to pre-defined rule.
It is one of following that above-mentioned pre-defined rule comprises: divide user among one or more empty users of branch each is empty, dividing user's intermediate code sequence number with this sky is that the midamble allocation of odd number is given main transmission block, and dividing user's intermediate code sequence number with this sky is that the midamble allocation of even number is given auxilliary transmission block; Perhaps, divide users among one or more empty users of branch each is empty, dividing user's intermediate code sequence number with this sky is that the midamble allocation of even number is given main transmission block, and dividing user's intermediate code sequence number with this sky is that the midamble allocation of odd number is given auxilliary transmission block.
In addition, said method also comprises: divide users among a plurality of empty users of branch each is empty, according to its spreading factor to carrying out correcting process for the intermediate code of its distribution.
The empty user's of branch spreading factor above-mentionedly divide user's spreading factor that the correcting process of carrying out for the intermediate code of its distribution is comprised: if then will divide the user final intermediate code as this sky for first intermediate code of its distribution less than 16 according to sky.
If the one or more skies among a plurality of empty users of branch divide the user to support single user's Multiple Input Multiple Output, then, for dividing user intermediate code that is used for main transmission block of distributing and the intermediate code that is used for auxilliary transmission block, this sky carries out correcting process according to its spreading factor for these one or more empty each empty branch users who divides among users.
Wherein, the correcting process that the spreading factor that divides the user according to sky carries out the intermediate code that is used for main transmission block and the intermediate code that is used for auxilliary transmission block comprises: if the empty user's of branch spreading factor is less than 16, the intermediate code that to divide the user finally to be used for main transmission as this sky for first intermediate code of the intermediate code that is used for main transmission block of its distribution then will divide the user finally to be used for the intermediate code of auxilliary transmission as this sky for first intermediate code of the intermediate code that is used for auxilliary transmission block of its distribution.
To achieve these goals, according to an aspect of the present invention, provide a kind of distributor of the intermediate code based on multi-user multiple input multiple output technology.
Distributor according to the intermediate code based on multi-user multiple input multiple output technology of the present invention comprises: acquisition module, the code channel number of the spread spectrum code word correspondence of be used to obtain the quantity of the maximum spendable intermediate code of system configuration, distributing for each empty user of branch and a plurality of empty users' of branch total quantity; Arithmetic unit, the code channel number of the spread spectrum code word correspondence of be used for the quantity of the maximum spendable intermediate code of the system configuration obtained according to acquisition module, distributing for each empty user of branch and a plurality of empty users' of branch total quantity are calculated as the quantity of the intermediate code that each empty user of branch distributes; Distribution module is used for according to the calculator result calculated, divides the user to distribute intermediate code for each is empty.
The aforementioned calculation device is calculated as the quantity km of the intermediate code of each the empty user of branch distribution according to following formula:
km＝[Ncode
sdma/(16/K)/N
sdma]，
Wherein, Ncode
SdmaBe expressed as the quantity of the code channel of the spread spectrum code word correspondence that each empty user of branch distributes, K represents the quantity of the maximum spendable intermediate code of system configuration, N
SdmaThe total quantity of representing a plurality of empty users of branch.
If the one or more skies among a plurality of empty users of branch divide the user to support single user's Multiple Input Multiple Output, then above-mentioned distribution module is after distributing intermediate code for one or more empty branch users, and above-mentioned distribution module also is used for: will distribute to the intermediate code that one or more skies divide users' intermediate code to be divided into the intermediate code that is used for main transmission block respectively and are used for auxilliary transmission block according to pre-defined rule.
It is one of following that above-mentioned pre-defined rule comprises: divide user among one or more empty users of branch each is empty, dividing user's intermediate code sequence number with this sky is that the midamble allocation of odd number is given main transmission block, and dividing user's intermediate code sequence number with this sky is that the midamble allocation of even number is given auxilliary transmission block; Perhaps, divide users among one or more empty users of branch each is empty, dividing user's intermediate code sequence number with this sky is that the midamble allocation of even number is given main transmission block, and dividing user's intermediate code sequence number with this sky is that the midamble allocation of odd number is given auxilliary transmission block.
If the empty spreading factor that divides the user is less than 16, then above-mentioned distribution module also is used for dividing the user final intermediate code with first intermediate code of distributing for the empty user of branch as distributing to this sky.
If empty user's the spreading factor that divides is less than 16, first intermediate code that then above-mentioned distribution module also is used for the intermediate code that is used for main transmission block that will distribute for the empty user of branch is as distributing to the intermediate code that this sky divides the user finally to be used for main transmission, will divide the user finally to be used for the auxilliary intermediate code of transmitting as distributing to this sky for sky divides first intermediate code of the intermediate code that is used for auxilliary transmission block that the user distributes.
By means of technique scheme one of at least, the present invention distributes intermediate code by the code channel number of the spread spectrum code word correspondence of distributing according to the quantity of the maximum spendable intermediate code of system configuration, for each empty user of branch and a plurality of empty users' of branch total quantity for each empty user of branch, overcome in the prior art and isolated identical being interfered of intermediate code that each interior empty user of branch distributes for certain space, thereby cause each empty problem of dividing the subscriber channel estimated quality to descend, improved the quality of channel estimating.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the method for salary distribution schematic diagram of the intermediate code of Default mode correspondence during K=8 in the correlation technique;
Fig. 2 is the flow chart according to the distribution method of the intermediate code of the embodiment of the invention;
Fig. 3 is the schematic diagram according to the channel estimating search window correspondence position of the embodiment of the invention;
Fig. 4 is another schematic diagram according to the channel estimating search window correspondence position of the embodiment of the invention;
Fig. 5 is the block diagram according to the distributor of the intermediate code of the embodiment of the invention.
Embodiment
Functional overview
As mentioned above, owing to be that the corresponding relation that sky divides the intermediate code of user's distribution to be based on intermediate code shown in Figure 1 and spreading code distributes, so the intermediate code of each empty branch user employing might be identical.In certain space isolation size, if each empty branch user adopts identical intermediate code, then intermediate code of each empty branch user reception can be subjected to the interference of other empty branch users' intermediate code, thereby causes each empty branch subscriber channel estimated quality decline.The present invention just at owing to adopt the problems referred to above that identical intermediate code caused, makes each empty user of branch adopt different intermediate codes, has avoided the phase mutual interference between the intermediate code.
Based on this, in order to satisfy the requirement that the empty user of branch of MU-MIMO system adopts different intermediate codes, the present invention expands the midamble allocation scheme in the correlation technique, and a kind of allocative decision of the intermediate code based on multi-user multiple input multiple output technology is provided.Promptly, according to the quantity of the maximum spendable intermediate code of system configuration, be code channel number (this code channel number of each empty user of branch spread spectrum code word correspondence of distributing, be the quantity of code channel) and a plurality of empty users' of branch total quantity divide user to distribute intermediate code for each is empty, wherein, the code channel number that divides the spread spectrum code word correspondence that user distributes for each is empty is according to be that each empty user of branch spread spectrum code word of distributing is definite.Than prior art, the present invention can improve the quality of channel estimating, and then improves the quality of transfer of data.
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.Need to prove that if do not conflict, embodiment and the feature among the embodiment among the application can make up mutually.
Method embodiment
According to the embodiment of the invention, a kind of distribution method of the intermediate code based on multi-user multiple input multiple output technology is provided, be used to a plurality of empty users of branch to distribute intermediate code.
This method comprises: divide users among above-mentioned a plurality of empty users of branch each is empty, according to the quantity of the maximum spendable intermediate code of system configuration, distribute intermediate code for this sky divides the code channel number of the spread spectrum code word correspondence that the user distributes and a plurality of empty users' of branch total quantity for each empty branch user.
Particularly, said method can be divided into following steps 1 and 2.
Km_all=[Ncode
Sdma/ (16/K)], wherein, Ncode
SdmaBe expressed as the code channel number of the spread spectrum code word correspondence of each the empty user of branch distribution, K represents the quantity of the maximum spendable intermediate code of system configuration.
Km=[km_all/N
Sdma], wherein, km_all is expressed as the total quantity of the intermediate code of more than 1 the empty users of branch distribution of above-mentioned steps, N
SdmaThe total quantity of representing a plurality of empty users of branch.
[(i-1) * km+m] to [i*km+m-1], wherein, km is expressed as the quantity of the intermediate code of each the empty user of branch distribution, and m represents the intermediate code sequence number of the initial code channel correspondence of the empty user of branch.
By above description as can be seen, distribute intermediate code by the code channel number of the spread spectrum code word correspondence of distributing and a plurality of empty users' of branch total quantity for each empty user of branch according to the quantity of the maximum spendable intermediate code of system configuration, for each empty user of branch, solved in the prior art because the identical problem of intermediate code of distributing for each empty user of branch of dividing that user's spreading code distributes that intermediate code causes according to sky, and then caused the problem of the quality of the mutual interference effect channel estimating of intermediate code between a plurality of empty users of branch.Than prior art, the embodiment of the invention can effectively improve the quality of channel estimating and the quality of transfer of data.
After having distributed intermediate code for above-mentioned a plurality of empty branch users, if one or more empty user of branch supports single user's multiple-input, multiple-output (MIMO) technology (following support that with an empty user of branch the Single User MIMO technology is that example illustrates), then also need to continue to carry out following operation, that is, will distribute to km the intermediate code that this sky divides the user and distribute to main transmission block and the auxilliary transmission block that this sky divides the user respectively in the mode that replaces.
That is to say that will distribute to the intermediate code separated into two parts that this sky divides the user, a part is used for main transmission block, another part is used for auxilliary transmission block.Operation can be particularly: will distribute this sky to divide the sequence number of user's intermediate code is that the intermediate code of odd number is used for main transmission block, is that the intermediate code of even number is used for assisting transmission block with distributing this sky to divide the sequence number of user's intermediate code; Certainly, can be that the intermediate code of even number is used for main transmission block also with distributing this sky divide the sequence number of user's intermediate code, be that the intermediate code of odd number is used for auxilliary transmission block with distributing this sky to divide the sequence number of user's intermediate code.
After having finished aforesaid operations, also need the intermediate code of above-mentioned distribution to be revised distribution according to each empty user's of branch spreading factor, revising batch operation particularly is: if the empty spreading factor that divides the user then will divide the user final intermediate code as this sky for first intermediate code of its distribution less than 16.That is, if certain empty spreading factor that divides the user less than 16, the final intermediate code that will divide first intermediate code in the intermediate code that the user distributes to divide the user as this sky for this sky according to aforesaid operations then; If should divide the user to support the Single User MIMO technology by sky, the intermediate code that to divide the user finally to be used for main transmission as this sky for first intermediate code of the intermediate code that is used for main transmission block of its distribution then will divide the user finally to be used for the intermediate code of auxilliary transmission as this sky for first intermediate code of the intermediate code that is used for auxilliary transmission block of its distribution.
Below with under certain time slot, the user of certain sub-district (comprising that empty user of branch and non-NULL divide the user) quantity is that Ku (Ku is not more than the K value) comes furthermore bright the present invention for example.Need to prove that Ku is not more than K, K represents the quantity of the maximum spendable intermediate code of system configuration.
Wherein, empty branch number of users is N
Sdma, the empty shared spreading code of user that divides is
(SF represents spreading factor), the code channel number that distributes for each empty user of branch is Ncode
SdmaThe code channel number here is the notion of empty code channel number, if SF=1 then represents the empty code channel of each empty user of branch corresponding to 16 SF=16, if SF=2 then represents the empty code channel of each empty user of branch corresponding to 8 SF=16.Non-NULL branch number of users is N
Cdma, be that the spreading code that i non-NULL divides the user to distribute is
The code channel number that divides the user to distribute for this non-NULL is Ncode
Cdma
Based on above-mentioned parameter, below carry out the process of distributing intermediate code particularly:
Step 1) is calculated as the spreading code that all skies divide the user to distribute
The total quantity (being designated as km_all) of corresponding intermediate code, that is, and km_all=[Ncode
Sdma/ (16/K)];
Step 2) calculate the quantity (km) of the intermediate code that each empty user of branch can be assigned to according to the total quantity (km_all) of sky branch number of users and the intermediate code that is assigned to, that is, and km=[km_all/N
Sdma];
Step 3) is according to each empty order of dividing the user, continuous successively distributes the intermediate code of respective numbers for each sky divides user, promptly, the intermediate code of i empty branch user correspondence is that [(i-1) * km+Default (m)] is to [i*km+Default (m)-1], wherein, Default (m) is used for sign according under the method for salary distribution of the prior art, and this sky divides the default midamble sequence number of the initial code channel correspondence of user, and this Default (m) is corresponding to the m in the above-mentioned steps 3;
Step 4) divides user's spreading factor that the intermediate code to its distribution is revised distribution according to sky: if should divide user's spreading factor less than 16 by sky, then the intermediate code of dividing the user to distribute finally for this sky is an above-mentioned steps 3) in be first intermediate code in the intermediate code of its distribution, that is, i empty to divide the corresponding intermediate code sequence number of user's (this sky divides user's spreading factor less than 16) be above-mentioned steps 3) in [(i-1) * km+Default (m)]; If should sky dividing user's spreading factor is 16, then do not need to revise distribution, finally distributing to the intermediate code that this sky divides the user is above-mentioned steps 3) in the intermediate code determined;
Step 5) can be respectively each non-NULL with reference to the Default mode of existing protocol regulation and divide the user to distribute the process of intermediate code for the process of dividing the user to distribute intermediate code for non-NULL.Particularly, the spreading code that divides the user according to i non-NULL
Calculate the quantity of corresponding intermediate code, that is, distribute to this i non-NULL and divide the quantity (being designated as km ') of user's intermediate code to be: km '=[Ncode
Cdma/ 2], then, according to the order that each non-NULL divides the user, continuous successively distributes the intermediate code of respective numbers for each non-NULL divides the user.Be similar to above-mentioned steps 4), also need to divide user's spreading factor that the intermediate code to its distribution is revised distribution according to non-NULL, the operation that revise to distribute can be with reference to above-mentioned steps 4).For the concrete operating process of this step 5), can repeat no more here with reference to relevant prior art.
In specific implementation process, divide user or non-NULL to divide the user (being designated as user 1) for the sky of supporting Single User MIMO, after having distributed intermediate code, also need to distribute main transmission block and the corresponding intermediate code of auxilliary transmission block (or being called stream 1, stream 2) respectively for this user 1 for user 1.This batch operation can be to distribute intermediate code in the mode that replaces, promptly, for [(i-1) the * km+1] that distribute to this user 1 to [i*km] individual intermediate code, with the sequence number of intermediate code is the main transmission block (or flow 1) of the midamble allocation of odd number to this user 1, the midamble allocation of even number is given this user's 1 auxilliary transmission block (or flowing 2); Perhaps, be the main transmission block (or flowing 1) that the midamble allocation of even number is given this user 1 with the sequence number of intermediate code, the midamble allocation of odd number is given this user's 1 auxilliary transmission block (or flowing 2).
After having carried out above-mentioned distribution, be similar to above-mentioned steps 4 to primary/secondary transmission block), also need the intermediate code of the primary/secondary transmission block that distributed to be revised distribution according to user 1 spreading factor.Particularly, if user 1 spreading factor, is then finally given first intermediate code in the intermediate code that the intermediate code of this primary/secondary transmission block that user 1 distributes is respectively the above-mentioned primary/secondary transmission block that distributes for user 1 less than 16.If user 1 spreading factor equals 16, then do not need to revise batch operation.
Below with under the current time slots, the user of certain sub-district all is that the empty user of branch be an example, describes the distribution method of intermediate code of the present invention in detail, wherein, sky branch number of users is N
Sdma, the code channel number that each empty user of branch distributes is Ncode
Sdma, the maximum available intermediate code sequence of K system configuration.Fig. 2 is the flow chart according to the distribution method of the intermediate code of the embodiment of the invention, and as shown in Figure 2, this method comprises the steps:
Step 202 is corresponding to above-mentioned steps 1 and step 2, to the N of current time slots
SdmaIndividual empty branch user distributes km search window respectively, and wherein, each search window is corresponding to a middle trained sequence code (Mid-amble shift), and km obtains according to following formula:
km＝[Ncode
sdma/(16/K)/N
sdma])；
Step 204 is corresponding to above-mentioned steps 3, according to the N of pre-sorting
SdmaThe individual empty user that divides distributes km intermediate code sequence successively, that is, the intermediate code sequence number of i empty branch user correspondence is that [(i-1) * km+1] is to [i*km];
Step 206, whether the empty user i that divides supports Single User MIMO, if support, then proceeds to step 208, otherwise, proceed to step 210;
Step 208, for dividing the main transmission block of user i and auxilliary transmission block (or flow 1, stream 2), this sky distributes intermediate code in the mode that replaces, concrete is treated to: divide the main transmission block (or flowing 1) of user i for this sky for the midamble allocation of strange (or idol) number sequence number at [(i-1) * km+1] to [i*km] individual intermediate code, divide the auxilliary transmission block (or flowing 2) of user i for this sky for the midamble allocation of idol (or strange) number sequence number, below proceed to step 210;
Step 210, according to each empty spreading factor (is example with above-mentioned empty branch user i) that divides the user, judge whether that the correction that will carry out intermediate code distributes, if the empty spreading factor of user i that divides is less than 16, then expression need be revised distribution, proceed to step 212, otherwise, distribute the flow process of intermediate code to finish;
Step 212 is corresponding to above-mentioned steps 4) in correction batch operation part, that is, and the final intermediate code of dividing the user as this sky with first intermediate code of distributing to the empty user's of branch intermediate code; Particularly, if do not support the user of Single User MIMO, the final intermediate code of dividing the user as this sky then with first intermediate code of distributing to the empty user's of branch intermediate code in the step 204; If support the user of Single User MIMO, the intermediate code of dividing user's final primary/secondary transmission block as this sky then with first intermediate code of intermediate code of distributing to the empty user's of branch primary/secondary transmission block in the step 208.
Need to prove, for convenience of description, in Fig. 2, illustrated and described the technical scheme of method embodiment of the present invention, can in computer system, carry out such as a set of computer-executable instructions in the step shown in Fig. 2 with the form of step.Though figure 2 illustrates logical order, in some cases, can carry out step shown or that describe with the order that is different from herein.
Below in conjunction with concrete scene description processing example of the present invention.
Example one
Fig. 3 is the schematic diagram according to the channel estimating search window correspondence position of the embodiment of the invention, as shown in Figure 3, when K=8, current time slots number of users Ku=2, N
Sdma=2 empty branch users (SF=16), (P is 128 to the long W=P/K=16 of window of two empty branch user correspondences, and these two the empty shared spreading codes of user that divide are
16 whole spreading codes, that is, and each empty code channel number (Ncode that divides the user
Sdma) be 16, wherein, empty branch user 1 also is the Single User MIMO user simultaneously.Distribute the flow process of intermediate code to comprise the steps (301-304) according to the embodiment of the invention for these two empty branch users:
Step 301 is corresponding to above-mentioned steps 1), these two empty divides the user according to separately spreading code, with the total quantity (km_all) of the intermediate code that is assigned with is: km_all=[Ncode
Sdma/ (16/K)]=8;
Step 302 is corresponding to above-mentioned steps 2), can obtain the quantity (km) of the intermediate code that each empty user of branch can be assigned to: km=[km_all/N by sky branch number of users and km_all
Sdma]=4;
Step 303 is corresponding to above-mentioned steps 3), be followed successively by these two the empty users of branch in order and distribute intermediate code, that is, the intermediate code of empty branch user 1 correspondence is m
(1)～m
(4), corresponding search window is [1,2,3,4]; The intermediate code of empty branch user 2 correspondences is m
(5)～m
(8), corresponding search window is [5,6,7,8];
Step 304 divides user 1 intermediate code to proceed to distribute to sky, that is, the intermediate code that empty branch user's 1 main transmission block (abbreviating " main piece " among the figure as) is corresponding is m
1, m
3, that is, the search window of main transmission block correspondence is [1,3]; The corresponding intermediate code of auxilliary transmission block (abbreviating " auxilliary piece " among the figure as) is m
2, m
4, that is, the search window of auxilliary transmission block correspondence is [2,4].
Because these two skies divide users' SF=16, then, do not need, for these two empty branch users distribute the process of intermediate code to finish for these two the empty users of branch carry out above-mentioned correction batch operation.
Example two
Based on above-mentioned example one, this example divides number of users N with sky
Sdma=4 is example, K=8, four empty long W=P/K=16 of window (P is 128) that divide user's correspondence, SF=16, Ncode
Sdma=16, that is, these four the empty shared spreading codes of user that divide are
16 whole spreading codes.
The flow process of the distribution intermediate code of describing according to above-mentioned example one in this example, is distributed intermediate code: m in order successively
(1)～m
(2)Be the intermediate code that sky divides user 1 to be assigned to, that is, the search window of empty branch user 1 correspondence is 1～2; m
(3)～m
(4)Be the intermediate code that sky divides user 2 to be assigned to, that is, the search window of empty branch user 2 correspondences is 3～4; m
(5)～m
(6)Be the intermediate code that sky divides user 3 to be assigned to, that is, the search window of empty branch user 3 correspondences is 5～6; m
(7)～m
(8)Be the intermediate code that sky divides user 4 to be assigned to, that is, the search window of empty branch user 4 correspondences is 7～8.
Example three
Fig. 4 is another schematic diagram according to the channel estimating search window correspondence position of the embodiment of the invention, as shown in Figure 4, when K=8, current time slots number of users Ku=4, wherein, the empty number of users N that divides
Sdma=2, these two the empty shared code channel numbers of user that divide are
Be designated as user 1, user 2, these two the empty long W=P/K=16 of window (P is 128) that divide user's correspondence; It is N that non-NULL divides number of users
Cdma=2, non-NULL divides the code channel number of CU to be respectively
With
Be designated as user 3, user 4.Distribute the flow process of intermediate code to comprise the steps (401-404) according to the embodiment of the invention for these four users:
Step 401 is corresponding to above-mentioned steps 1) and 2) (or step 301 and step 302), N
SdmaIndividual empty branch user distributes km intermediate code, km=[Ncode respectively
Sdma/ (16/K)/N
Sdma]=[8/2/2]=2;
Step 402 is corresponding to above-mentioned steps 3) (or step 303), according to distributing intermediate code, m for these two empty branch users in proper order successively
(1)～m
(2)Be the intermediate code that user 1 is assigned to, the search window of user's 1 correspondence is 1～2; m
(3)～m
(4)Be the intermediate code that user 2 is assigned to, the search window of user's 2 correspondences is 3～4;
Step 403, N
CdmaIndividual user distributes the individual intermediate code of km ' respectively, km '=[4/2]=2;
Step 404 is according to distributing intermediate code, m for non-NULL divides the user in proper order successively
(5)～m
(6)Be the intermediate code that user 3 is assigned to, the search window of user's 3 correspondences is 5～6; m
(7)～m
(8)Be the intermediate code that user 4 is assigned to, the search window of user's 4 correspondences is 7～8.
Above-mentioned steps 403 and step 404 are corresponding to above-mentioned steps 5).
Example four
In this example, K=8, the empty number of users N that divides
Sdma=2, Ncode
Sdma=8, these two the empty shared spreading codes of user's (being designated as user 1 and user 2) that divide are
These two the empty long W=P/K=16 of window (P is 128) that divide user's correspondence; Non-NULL divides the user quantity N of (being designated as user 3)
Cdma=1, Ncode
Cdma=8, non-NULL divides the code channel number of CU to be
Distribute the flow process of intermediate code to comprise the steps (501-506) according to the embodiment of the invention for these three users:
Step 501 is corresponding to above-mentioned steps 1) and 2) (or step 301 and step 302, or step 401), N
SdmaIndividual empty branch user distributes km intermediate code, km=[Ncode respectively
Sdma/ (16/K)/N
Sdma]=[8/2/2]=2;
Step 502 is corresponding to above-mentioned steps 3) (or step 303 or step 402), according to distributing intermediate code, m for these two empty branch users in proper order successively
(1)～m
(2)Be the intermediate code that user 1 is assigned to, m
(3)～m
(4)The intermediate code that is assigned to for user 2;
Step 503, because these two empty user's the spreading factors that divide are less than 16, then need the intermediate code of distributing in the above-mentioned steps 502 is revised distribution, promptly, only need and first midamble allocation of the intermediate code of distribution to give user 1 and user 2 in the above-mentioned steps 502, just, the intermediate code of user's 1 distribution is m
(1), the search window of user's 1 correspondence is 1, the intermediate code that user 2 distributes is m
(3), the search window of user's 2 correspondences is 3;
Step 504, corresponding to step 403, N
CdmaIndividual user distributes the individual intermediate code of km ', km '=4 respectively;
Step 505, corresponding to step 404, distributing to the intermediate code that non-NULL divides the user is m
(5)～m
(8)
Step 506, because user 3 spreading factor less than 16, then only needs first intermediate code of the intermediate code of distribution in the allocation step 505 to give user 3, that is, the intermediate code that user 3 is assigned to is m
(5), the search window of user's 3 correspondences is 5.
Device embodiment
According to the embodiment of the invention, a kind of distributor of the intermediate code based on multi-user multiple input multiple output technology is provided, be preferably used for realizing the method among the said method embodiment.
Fig. 5 is the block diagram according to the distributor of the intermediate code of the embodiment of the invention, and as shown in Figure 5, this device comprises: acquisition module 1, arithmetic unit 2 and distribution module 3 below are described in detail each module.
km＝[Ncode
sdma/(16/K)/N
sdma]，
Wherein, Ncode
SdmaBe expressed as the quantity of the code channel of the spread spectrum code word correspondence that each empty user of branch distributes, K represents the quantity of the maximum spendable intermediate code of system configuration, N
SdmaThe total quantity of representing a plurality of empty users of branch.
By above description as can be seen, divide user to distribute intermediate code according to the result of calculation of arithmetic unit 2 for empty by distribution module 3, overcome in the prior art to distribute intermediate code to cause the identical situation of intermediate code of each the empty user of branch employing for sky divides the user based on the intermediate code shown in Figure 1 and the corresponding relation of spreading code, and then overcome the problem of each the intermediate code phase mutual interference that causes owing to intermediate code is identical of the prior art, improved each empty subscriber channel estimated quality that divides.
If the one or more skies among a plurality of empty users of branch divide the user to support single user's Multiple Input Multiple Output, then distribution module 3 is after distributing intermediate code for one or more empty branch users, and distribution module 3 also is used for: will distribute to the intermediate code that one or more skies divide users' intermediate code to be divided into the intermediate code that is used for main transmission block respectively and are used for auxilliary transmission block according to pre-defined rule.
Above-mentioned pre-defined rule is: for one or more empty each empty branch user who divides among the users, dividing user's intermediate code sequence number with this sky is that the midamble allocation of odd number is given main transmission block, and dividing user's intermediate code sequence number with this sky is that the midamble allocation of even number is given auxilliary transmission block; Perhaps, divide users among one or more empty users of branch each is empty, dividing user's intermediate code sequence number with this sky is that the midamble allocation of even number is given main transmission block, and dividing user's intermediate code sequence number with this sky is that the midamble allocation of odd number is given auxilliary transmission block.
If empty user's the spreading factor that divides is less than 16, then distribution module 3 also is used for dividing the user final intermediate code with first intermediate code of distributing for the empty user of branch as distributing to this sky, that is, distribution module 3 also is used for the correction batch operation that said method embodiment describes.
Correspondingly, divide the user for the sky of supporting single user's Multiple Input Multiple Output, if should divide user's spreading factor less than 16 by sky, then distribution module 3 first intermediate code of also being used for the intermediate code that is used for main transmission block that will distribute for the empty user of branch is as distributing to the intermediate code that this sky divides the user finally to be used for main transmission, will divide the user finally to be used for the auxilliary intermediate code of transmitting as distributing to this sky for sky divides first intermediate code of the intermediate code that is used for auxilliary transmission block that the user distributes.
The implementation of above-mentioned module can repeat no more here with reference to the corresponding description among the said method embodiment particularly.
In sum, the code channel number of the embodiment of the invention spread spectrum code word correspondence of distributing according to the quantity of the maximum spendable intermediate code of system configuration, for each empty user of branch and a plurality of empty users' of branch total quantity are distributed intermediate code for each empty user of branch.Than prior art, the present invention can avoid the phase mutual interference between the identical intermediate code, improves the quality of channel estimating, and then improves the quality of transfer of data.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1. the distribution method based on the intermediate code of multi-user multiple input multiple output technology is used to a plurality of empty users of branch to distribute intermediate code, it is characterized in that described method comprises:
Dividing users among described a plurality of empty users of branch each is empty, is that described each empty branch user distributes intermediate code according to the quantity of the maximum spendable intermediate code of system configuration, for this sky divides the code channel number of the spread spectrum code word correspondence that the user distributes and described a plurality of empty users' of branch total quantity.
2. method according to claim 1 is characterized in that, for described each empty branch user distributes the processing of intermediate code to comprise:
For described each empty divide user, be defined as the total quantity of the intermediate code of the described a plurality of empty user of branch distribution according to the quantity of the maximum spendable intermediate code of its system configuration with for this sky divides the code channel number of the described spread spectrum code word correspondence that the user distributes;
Be defined as the quantity that described each sky divides the intermediate code of user's distribution according to the total quantity of the intermediate code of dividing users' distribution for described a plurality of skies and described a plurality of empty users' of branch total quantity.
3. method according to claim 2 is characterized in that, after the quantity of the intermediate code of having determined to distribute for described each empty user of branch, described method also comprises:
Distribute corresponding intermediate code for described each empty branch user continuously successively.
4. method according to claim 2 is characterized in that, is defined as the total quantity km_all of the intermediate code of the described a plurality of empty user of branch distribution according to following formula:
Km_all=[Ncode
Sdma/ (16/K)], wherein, Ncode
SdmaBe expressed as the code channel number of the described spread spectrum code word correspondence of each the empty user of branch distribution, K represents the quantity of the maximum spendable intermediate code of system configuration.
5. method according to claim 2 is characterized in that, is defined as the quantity km of the intermediate code of described each the empty user of branch distribution according to following formula:
Km=[km_all/N
Sdma], wherein, km_all is expressed as the total quantity of the intermediate code of the described a plurality of empty user of branch distribution, N
SdmaThe total quantity of representing described a plurality of empty users of branch.
6. method according to claim 3 is characterized in that, for described each empty branch user distributes the processing of the intermediate code of respective numbers to comprise:
Be defined as the sequence number of intermediate code of described a plurality of empty users' of branch i the empty user of branch distribution according to following formula: [(i-1) * km+m] is to [i*km+m-1], wherein, km is expressed as the quantity of the intermediate code of each the empty user of branch distribution, and m represents the intermediate code sequence number of the initial code channel correspondence of the empty user of branch.
7. method according to claim 1, it is characterized in that, if the one or more skies among described a plurality of empty user of branch divide the user to support single user's Multiple Input Multiple Output, be that described method also comprised after described one or more empty user of branch distributed intermediate code then:
For described one or more empty each of dividing among the users, will distribute to the intermediate code that intermediate code that this sky divides the user is divided into the intermediate code that is used for main transmission block and is used for auxilliary transmission block according to pre-defined rule.
8. method according to claim 7 is characterized in that, it is one of following that described pre-defined rule comprises:
Divide users among described one or more empty users of branch each is empty, dividing user's intermediate code sequence number with this sky is that the midamble allocation of odd number is given described main transmission block, and dividing user's intermediate code sequence number with this sky is that the midamble allocation of even number is given described auxilliary transmission block; Perhaps
Divide users among described one or more empty users of branch each is empty, dividing user's intermediate code sequence number with this sky is that the midamble allocation of even number is given described main transmission block, and dividing user's intermediate code sequence number with this sky is that the midamble allocation of odd number is given described auxilliary transmission block.
9. according to each described method in the claim 1 to 6, it is characterized in that described method also comprises:
Divide users among described a plurality of empty users of branch each is empty, according to its spreading factor to carrying out correcting process for the intermediate code of its distribution.
10. method according to claim 9 is characterized in that, according to described empty user's the spreading factor that divides the described correcting process of carrying out for the intermediate code of its distribution is comprised:
If the described empty spreading factor that divides the user then will divide the user final intermediate code as this sky for first intermediate code of its distribution less than 16.
11., it is characterized in that described method also comprises according to claim 7 or 8 described methods:
For described a plurality of empty each empty branch user who divides among the users, for dividing user intermediate code that is used for main transmission block of distributing and the intermediate code that is used for auxilliary transmission block, this sky carries out correcting process according to its spreading factor.
12. method according to claim 11 is characterized in that, the described correcting process of the intermediate code that is used for main transmission block and the intermediate code that is used for auxilliary transmission block being carried out according to the described empty spreading factor that divides the user comprises:
If described empty user's the spreading factor that divides is less than 16, the intermediate code that to divide the user finally to be used for main transmission as this sky for first intermediate code of the intermediate code that is used for main transmission block of its distribution then will divide the user finally to be used for the intermediate code of auxilliary transmission as this sky for first intermediate code of the intermediate code that is used for auxilliary transmission block of its distribution.
13. the distributor based on the intermediate code of multi-user multiple input multiple output technology is characterized in that, described device comprises:
Acquisition module, the code channel number of the spread spectrum code word correspondence of be used to obtain the quantity of the maximum spendable intermediate code of system configuration, distributing for described each empty user of branch and described a plurality of empty users' of branch total quantity;
Arithmetic unit, the code channel number of the spread spectrum code word correspondence of be used for the quantity of the maximum spendable intermediate code of the described system configuration obtained according to described acquisition module, distributing for described each empty user of branch and described a plurality of empty users' of branch total quantity are calculated as the quantity of the intermediate code that described each empty user of branch distributes;
Distribution module is used for according to described calculator result calculated, for described each empty branch user distributes intermediate code.
14. device according to claim 13 is characterized in that, described calculator is calculated as the quantity km of the intermediate code of described each the empty user of branch distribution according to following formula:
km＝[Ncode
sdma/(16/K)/N
sdma]，
Wherein, Ncode
SdmaBe expressed as the code channel number of the spread spectrum code word correspondence of each the empty user of branch distribution, K represents the quantity of the maximum spendable intermediate code of described system configuration, N
SdmaThe total quantity of representing described a plurality of empty users of branch.
15. device according to claim 13, it is characterized in that, if the one or more skies among described a plurality of empty user of branch divide the user to support single user's Multiple Input Multiple Output, then described distribution module is after distributing intermediate code for described one or more empty branch users, and described distribution module also is used for: will distribute to the intermediate code that described one or more sky divides users' intermediate code to be divided into the intermediate code that is used for main transmission block respectively and is used for auxilliary transmission block according to pre-defined rule.
16. device according to claim 15 is characterized in that, it is one of following that described pre-defined rule comprises:
Divide users among described one or more empty users of branch each is empty, dividing user's intermediate code sequence number with this sky is that the midamble allocation of odd number is given described main transmission block, and dividing user's intermediate code sequence number with this sky is that the midamble allocation of even number is given described auxilliary transmission block; Perhaps
Divide users among described one or more empty users of branch each is empty, dividing user's intermediate code sequence number with this sky is that the midamble allocation of even number is given described main transmission block, and dividing user's intermediate code sequence number with this sky is that the midamble allocation of odd number is given described auxilliary transmission block.
17. according to claim 13 or 14 described devices, it is characterized in that,
If the described empty spreading factor that divides the user is less than 16, then described distribution module also is used for dividing the user final intermediate code with first intermediate code of distributing for the described empty user of branch as distributing to this sky.
18. according to claim 15 or 16 described devices, it is characterized in that,
If described empty user's the spreading factor that divides is less than 16, first intermediate code that then described distribution module also is used for the intermediate code that is used for main transmission block that will distribute for the described empty user of branch is as distributing to the intermediate code that this sky divides the user finally to be used for main transmission, and first intermediate code of the intermediate code that is used for auxilliary transmission block that will distribute for the described empty user of branch divide the user finally to be used for the auxilliary intermediate code of transmitting as distributing to this sky.
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