CN101848068B - 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, referred to as MU-MIMO) technology is to utilize space between different user to cut apart to form different channels, can be so that there is the multiplexing identical physical resource of user of certain space isolation, thus the capacity of mobile communications network improved.
At present, system employing default allocation scheme is each user assignment middle trained sequence code (Mid-amble, referred to as intermediate code).The distributed amongst scheme of this acquiescence is that spreading code (can be called spread spectrum code word) according to user distributes intermediate code, and spreading code and intermediate code are relations one to one.That is, identical spreading code, corresponding intermediate code is also identical.That is to say, if the identical spread spectrum code resources of system multiplexing, the intermediate code for empty minute user assignment is also identical.During Fig. 1 K=8 of the prior art, the corresponding relation of intermediate code and spreading code under Default mode, wherein, K represents the spendable intermediate code quantity of the maximum of system configuration.As shown in Figure 1, wherein, spreading code: C
1 (1), C
2 (1), C
4 (1), C
8 (1)and C
16 (1), C
16 (2) *corresponding intermediate code is the first number, that is, and and m
(1), each spreading code all has a corresponding intermediate code by that analogy.
Intermediate code based on shown in Fig. 1 and the corresponding relation of spreading code, if user adopts identical spread spectrum code word (that is, this user is empty minute user), the intermediate code that each empty minute user adopts is identical.In certain space isolation, if each empty minute user adopts identical intermediate code, between these identical intermediate codes, can interfere with each other,, be the interference that a sky divides the intermediate code of user assignment can be subject to other empty minute users' identical intermediate code, thereby cause the decline of each empty minute subscriber channel estimated quality.
At present, for cause the problem of the decline of empty minute subscriber channel estimated quality in certain space isolation in correlation technique because identical intermediate code is interfering with each other, effective solution is not yet proposed.
Summary of the invention
For above-mentioned each empty minute user in certain space isolation, adopt identical intermediate code and be subject to the interference of other empty minute users' intermediate code, thereby cause the problem that each empty minute subscriber channel estimated quality declines and propose the present invention.For this reason, the present invention aims to provide a kind of allocative decision of the 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 skies to divide user assignment intermediate code.
According to the distribution method of the intermediate code based on multi-user multiple input multiple output technology of the present invention, comprise: for a plurality of skies, divide each the empty minute user in user, the total quantity of dividing code channel number corresponding to the spread spectrum code word of user assignment and a plurality of sky to divide user according to the quantity of the spendable intermediate code of maximum of system configuration, for this sky is divided user assignment intermediate code for each is empty.
Wherein, for each is empty, divide the processing of user assignment intermediate code to comprise: for each empty minute user, according to the quantity of the spendable intermediate code of maximum of its system configuration with for this sky divides the code channel number corresponding to spread spectrum code word of user assignment, to be defined as the total quantity that a plurality of skies divide the intermediate code of user assignment; According to divide total quantity and a plurality of sky of the intermediate code of user assignment to divide user's total quantity to be defined as the quantity of the intermediate code of each empty minute user assignment for a plurality of skies.
After having determined the quantity of the intermediate code of dividing user assignment for each is empty, said method also comprises: be each empty minute corresponding intermediate code of user assignment successively continuously.
Preferably, according to following formula, be defined as the total quantity km_all that a plurality of skies divide the intermediate code of user assignment:
Km_all=[Ncode
sdma/ (16/K)], wherein, Ncode
sdmacode channel number corresponding to spread spectrum code word that is expressed as each empty minute user assignment, K represents the quantity of the spendable intermediate code of maximum of system configuration.
Preferably, according to following formula, be defined as the quantity km of the intermediate code of each empty minute user assignment:
Km=[km_all/N
sdma], wherein, km_all is expressed as the total quantity that a plurality of skies divide the intermediate code of user assignment, N
sdmarepresent that a plurality of skies divide user's total quantity.
The processing of the above-mentioned intermediate code for each empty minute user assignment respective numbers comprises: according to following formula, be defined as i the empty sequence number of dividing the intermediate code of user assignment that a plurality of skies divide user: [(i-1) * km+m] to [i*km+m-1], wherein, km is expressed as the quantity of the intermediate code of each empty minute user assignment, and m represents empty minute intermediate code sequence number corresponding to the initial code channel of user.
If a plurality of skies divide the one or more skies in user to divide the alone family of User support Multiple Input Multiple Output, after dividing user assignment intermediate code for one or more skies, method also comprises: for one or more skies, divide each in user, according to pre-defined rule, the intermediate code of distributing to this sky and divide user is divided into for the intermediate code of main transmission block with for the intermediate code of auxiliary transmission block.
It is one of following that above-mentioned pre-defined rule comprises: for one or more skies, divide each the empty minute user in user, divide midamble allocation that user's intermediate code sequence number is odd number to main transmission block in this sky, divide midamble allocation that user's intermediate code sequence number is even number to auxiliary transmission block in this sky; Or, for one or more skies, divide each the empty minute user in user, divide midamble allocation that user's intermediate code sequence number is even number to main transmission block in this sky, divide midamble allocation that user's intermediate code sequence number is odd number to auxiliary transmission block in this sky.
In addition, said method also comprises: for a plurality of skies, divide each the empty minute user in user, according to its spreading factor to carrying out correcting process for the intermediate code of its distribution.
Above-mentionedly according to sky, divide user's spreading factor to comprise the correcting process of carrying out for the intermediate code of its distribution: if empty minute user's spreading factor is less than 16, will as this sky, to divide user final intermediate code for first intermediate code of its distribution.
If a plurality of skies divide the one or more skies in user to divide the alone family of User support Multiple Input Multiple Output, for the one or more sky, divide each the empty minute user in user, according to its spreading factor, divide the intermediate code for main transmission block of user assignment and carry out correcting process for the intermediate code of auxiliary transmission block for this sky.
Wherein, the spreading factor that divides user according to sky comprises the intermediate code for main transmission block and the correcting process of carrying out for the intermediate code of auxiliary transmission block: if empty minute user's spreading factor is less than 16, using first intermediate code for the intermediate code for main transmission block of its distribution as this sky, divide user finally for the intermediate code of main transmission, using first intermediate code of the intermediate code for auxiliary transmission block for its distribution as this sky, divide user finally for the intermediate code of auxiliary transmission.
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.
According to the distributor of the intermediate code based on multi-user multiple input multiple output technology of the present invention, comprise: acquisition module, for the total quantity of obtaining the quantity of the spendable intermediate code of maximum of system configuration, dividing user for code channel number corresponding to the spread spectrum code word of each empty minute user assignment and a plurality of sky; Arithmetic unit, divides user's total quantity to be calculated as quantity of the intermediate code of each empty minute user assignment for the quantity of the spendable intermediate code of maximum of the system configuration obtained according to acquisition module, for code channel number corresponding to the spread spectrum code word of each empty minute user assignment and a plurality of sky; Distribution module, for the result of calculating according to arithmetic unit, is each empty minute user assignment intermediate code.
Above-mentioned calculator is calculated as the quantity km of the intermediate code of each empty minute user assignment according to following formula:
km＝[Ncode
sdma/(16/K)/N
sdma]，
Wherein, Ncode
sdmathe quantity that is expressed as code channel corresponding to the spread spectrum code word of each empty minute user assignment, K represents the quantity of the spendable intermediate code of maximum of system configuration, N
sdmarepresent that a plurality of skies divide user's total quantity.
If a plurality of skies divide the one or more skies in user to divide the alone family of User support Multiple Input Multiple Output, above-mentioned distribution module is for after one or more skies divide user assignment intermediate code, above-mentioned distribution module also for: according to pre-defined rule, the intermediate code of distributing to one or more skies and divide user is divided into respectively for the intermediate code of main transmission block with for the intermediate code of auxiliary transmission block.
It is one of following that above-mentioned pre-defined rule comprises: for one or more skies, divide each the empty minute user in user, divide midamble allocation that user's intermediate code sequence number is odd number to main transmission block in this sky, divide midamble allocation that user's intermediate code sequence number is even number to auxiliary transmission block in this sky; Or, for one or more skies, divide each the empty minute user in user, divide midamble allocation that user's intermediate code sequence number is even number to main transmission block in this sky, divide midamble allocation that user's intermediate code sequence number is odd number to auxiliary transmission block in this sky.
If empty minute user's spreading factor is less than 16, above-mentioned distribution module is also for dividing user final intermediate code as distributing to this sky for first intermediate code of empty minute user assignment.
If empty minute user's spreading factor is less than 16, above-mentioned distribution module is also for dividing user finally for the intermediate code of main transmission as distributing to this sky first intermediate code of the intermediate code for main transmission block for empty minute user assignment, divides user finally for the intermediate code of auxiliary transmission first intermediate code of the intermediate code for auxiliary transmission block for empty minute user assignment as distributing to this sky.
By means of technique scheme one of at least, the present invention is by being each empty minute user assignment intermediate code according to the quantity of the spendable intermediate code of maximum of system configuration, the total quantity of dividing user for code channel number corresponding to the spread spectrum code word of each empty minute user assignment and a plurality of sky, overcome in prior art is each empty identical being interfered of intermediate code of dividing user assignment in certain space isolation, thereby cause each empty problem of dividing subscriber channel estimated quality to decline, improved the quality of channel estimating.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the method for salary distribution schematic diagram of intermediate code corresponding to Default mode during K=8 in correlation technique;
Fig. 2 is according to the flow chart of the distribution method of the intermediate code of the embodiment of the present invention;
Fig. 3 is according to the schematic diagram of the channel estimating search window correspondence position of the embodiment of the present invention;
Fig. 4 is according to another schematic diagram of the channel estimating search window correspondence position of the embodiment of the present invention;
Fig. 5 is according to the block diagram of the distributor of the intermediate code of the embodiment of the present invention.
Embodiment
Functional overview
As mentioned above, because the intermediate code for empty minute user assignment is that intermediate code based on shown in Fig. 1 is distributed with the corresponding relation of spreading code, so the intermediate code of each user's employing in empty minute is likely identical.In certain space isolation size, if each empty minute user adopts identical intermediate code, the intermediate code that each empty minute user receives can be subject to the interference of other empty minute users' intermediate code, thereby causes each empty minute subscriber channel estimated quality to decline.The present invention, just for the problems referred to above owing to adopting identical intermediate code to cause, makes each empty minute user adopt different intermediate codes, has avoided the phase mutual interference between intermediate code.
Based on this, in order to meet the empty minute user of MU-MIMO system, adopt the requirement of different intermediate codes, the present invention expands the midamble allocation scheme in correlation technique, and a kind of allocative decision of the intermediate code based on multi-user multiple input multiple output technology is provided.; according to the quantity of the spendable intermediate code of maximum of system configuration, be code channel number (this code channel number corresponding to spread spectrum code word of each empty minute user assignment; be the quantity of code channel) and a plurality of sky total quantity of dividing user be each empty minute user assignment intermediate code; wherein, for code channel number corresponding to the spread spectrum code word of each empty minute user assignment determined according to the spread spectrum code word that is each empty minute user assignment.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.It should be noted that, if do not conflicted, embodiment and the feature in embodiment in the application can combine mutually.
Embodiment of the method
According to the embodiment of the present 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 skies to divide user assignment intermediate code.
The method comprises: for above-mentioned a plurality of skies, divide each the empty minute user in user, the total quantity of dividing code channel number corresponding to the spread spectrum code word of user assignment and a plurality of sky to divide user according to the quantity of the spendable intermediate code of maximum of system configuration, for this sky is divided user assignment intermediate code for each is empty.
Particularly, said method can be divided into following steps 1 and 2.
Step 1, for each empty minute user, is defined as according to the quantity of the spendable intermediate code of maximum of system configuration with for this sky divides the code channel number corresponding to spread spectrum code word of user assignment the total quantity that a plurality of skies divide the intermediate code of user assignment.In this step, being defined as the total quantity (being designated as km_all) that a plurality of skies divide the intermediate code of user assignment can represent with following formula:
Km_all=[Ncode
sdma/ (16/K)], wherein, Ncode
sdmacode channel number corresponding to spread spectrum code word that is expressed as each empty minute user assignment, K represents the quantity of the spendable intermediate code of maximum of system configuration.
Step 2, according to divide total quantity and a plurality of sky of the intermediate code of user assignment to divide user's total quantity to be defined as the quantity of the intermediate code of each empty minute user assignment for a plurality of skies.The quantity (being designated as km) that is defined as the intermediate code of each empty minute user assignment in this step can represent with following formula:
Km=[km_all/N
sdma], wherein, km_all is expressed as the total quantity of the intermediate code of more than 1 empty minute user assignments of above-mentioned steps, N
sdmarepresent that a plurality of skies divide user's total quantity.
Step 3, the intermediate code of dividing user to distribute successively respective numbers to above-mentioned a plurality of skies respectively, can determine that a plurality of skies divide the sequence number of the intermediate code of i empty minute user assignment in user with following formula:
[(i-1) * km+m], to [i*km+m-1], wherein, km is expressed as the quantity of the intermediate code of each empty minute user assignment, and m represents empty minute intermediate code sequence number corresponding to the initial code channel of user.
By above description, can be found out, by being each empty minute user assignment intermediate code according to the quantity of the spendable intermediate code of maximum of system configuration, the total quantity of dividing user for code channel number corresponding to the spread spectrum code word of each empty minute user assignment and a plurality of sky, solved in prior art due to the identical problem of intermediate code for each empty minute user assignment of dividing user's spreading code to distribute intermediate code to cause according to sky, and then caused a plurality of skies to divide the problem of the quality of the mutual interference effect channel estimating of intermediate code between user.Than prior art, the embodiment of the present invention can effectively improve the quality of channel estimating and the quality of transfer of data.
After for above-mentioned a plurality of skies intermediate code of having divided user assignment, if one or more empty minute User support alone family multiple-input, multiple-output (MIMO) technology (sky of take below divides User support Single User MIMO technology to illustrate as example), also need to continue to carry out following operation, that is, in the mode replacing, by distributing to this sky, divide user's km intermediate code to distribute to respectively main transmission block and the auxiliary transmission block that this sky divides user.
That is to say, by distributing to this sky, divide user's intermediate code to be divided into two parts, a part is for main transmission block, and another part is for auxiliary transmission block.Operation can be particularly: will distribute this sky to divide intermediate code that the sequence number of user's intermediate code is odd number for main transmission block, will distribute this sky to divide intermediate code that the sequence number of user's intermediate code is even number for auxiliary transmission block; Certainly, also can will distribute this sky divide intermediate code that the sequence number of user's intermediate code is even number for main transmission block, will distribute this sky to divide intermediate code that the sequence number of user's intermediate code is odd number for auxiliary transmission block.
After having completed aforesaid operations, also need, according to each empty minute user's spreading factor, the intermediate code of above-mentioned distribution is revised to distribution, revising particularly batch operation is: if empty minute user's spreading factor is less than 16, will as this sky, divide user final intermediate code for first intermediate code of its distribution.That is, if spreading factor of certain empty minute user is less than 16, using the final intermediate code of dividing first intermediate code in the intermediate code of user assignment to divide user as this sky for this sky according to aforesaid operations; If this sky divides User support Single User MIMO technology, using first intermediate code for the intermediate code for main transmission block of its distribution as this sky, divide user finally for the intermediate code of main transmission, using first intermediate code of the intermediate code for auxiliary transmission block for its distribution as this sky, divide user finally for the intermediate code of auxiliary transmission.
Below with under certain time slot, to be Ku (Ku is not more than K value) carry out furthermore bright the present invention for example to the user of certain community (comprising that empty minute user and non-NULL divide user) quantity.It should be noted that, Ku is not more than K, and K represents the quantity of the spendable intermediate code of maximum of system configuration.
Wherein, empty minute user's quantity is N
sdma, the empty minute shared spreading code of user is
(SF represents spreading factor), for each is empty, dividing the code channel number of user assignment is Ncode
sdma.The code channel number is here the concept of empty code channel number, if SF=1 represents that each empty minute user is corresponding to the empty code channel of 16 SF=16, if SF=2 represents that each empty minute user is corresponding to the empty code channel of 8 SF=16.It is N that non-NULL divides user's quantity
cdma, be that i non-NULL divides the spreading code of user assignment to be
for this non-NULL divides the code channel number of user assignment, be Ncode
cdma.
Based on above-mentioned parameter, below carry out the process of distributing particularly intermediate code:
Step 1) be calculated as the spreading code that all skies divide user assignment
the total quantity (being designated as km_all) of corresponding intermediate code, that is, and km_all=[Ncode
sdma/ (16/K)];
The quantity (km) of step 2) dividing user's quantity and the total quantity (km_all) of the intermediate code that is assigned to calculate the intermediate code that each empty minute user can be assigned to according to sky, that is, and km=[km_all/N
sdma];
Step 3) according to each empty minute user's order, continuous is the intermediate code of each empty minute user assignment respective numbers successively,, an i empty minute intermediate code corresponding to user is that [(i-1) * km+Default (m)] is to [i*km+Default (m)-1], wherein, Default (m) is for sign according under the method for salary distribution of the prior art, and this sky divides the default midamble sequence number that the initial code channel of user is corresponding, and this Default (m) is corresponding to the m in above-mentioned steps 3;
Step 4) according to sky, divide user's spreading factor to revising distribution to the intermediate code of its distribution: if this sky divides user's spreading factor to be less than 16, dividing the intermediate code of user assignment finally to this sky is above-mentioned steps 3) in be first intermediate code in the intermediate code of its distribution, that is, i empty minute intermediate code sequence number corresponding to user's (this sky divides user's spreading factor to be less than 16) is above-mentioned steps 3) in [(i-1) * km+Default (m)]; If it is 16 that this sky divides user's spreading factor, do not need to revise distribution, finally distributing to the intermediate code that this sky divides user is above-mentioned steps 3) in definite intermediate code;
Step 5), for divide the process of user assignment intermediate code for non-NULL, can be respectively the process that each non-NULL divides user assignment intermediate code with reference to the Default mode of existing protocol regulation.Particularly, the spreading code that divides 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 each non-NULL, divide user's order, divide the intermediate code of user assignment respective numbers for each non-NULL continuously successively.Be similar to above-mentioned steps 4), also need to divide user's spreading factor to revising distribution to the intermediate code of its distribution according to non-NULL, the operation revise distributing can be with reference to above-mentioned steps 4).For this step 5) concrete operating process, can, with reference to relevant prior art, repeat no more here.
In specific implementation process, for supporting the sky of Single User MIMO to divide user or non-NULL to divide user (being designated as user 1), after having distributed intermediate code for user 1, also need to distribute respectively main transmission block and intermediate code corresponding to auxiliary transmission block (or being called stream 1, stream 2) for this user 1.This batch operation can be that the mode replacing is distributed intermediate code,, for [(i-1) the * km+1] that distribute to this user 1 to [i*km] individual intermediate code, the midamble allocation that is odd number by the sequence number of intermediate code is given this user's 1 main transmission block (or stream 1), the midamble allocation of even number is given to this user's 1 auxiliary transmission block (or stream 2); Or the midamble allocation that is even number by the sequence number of intermediate code is given this user's 1 main transmission block (or stream 1), the midamble allocation of odd number is given to this user's 1 auxiliary transmission block (or stream 2).
Carried out above-mentioned to the distribution of primary/secondary transmission block after, be similar to above-mentioned steps 4), also need, according to user 1 spreading factor, the intermediate code of the primary/secondary transmission block having distributed is revised to distribution.Particularly, if user 1 spreading factor is less than 16, finally give 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 distributing for user 1.If user 1 spreading factor equals 16, do not need to revise batch operation.
With under current time slots, the user of certain community is all that an empty minute user is example, describes the distribution method of intermediate code of the present invention in detail below, and wherein, empty minute user's quantity is N
sdma, the code channel number of each empty minute user assignment is Ncode
sdma, the available intermediate code sequence of maximum of K system configuration.Fig. 2 is according to the flow chart of the distribution method of the intermediate code of the embodiment of the present invention, and as shown in Figure 2, the method comprises the steps:
Step 202, corresponding to above-mentioned steps 1 and step 2, the N to current time slots
sdmaindividual sky divides user to distribute respectively km search window, 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, corresponding to above-mentioned steps 3, according to the N of pre-sorting
sdmaindividual sky divides user, distributes successively km intermediate code sequence, that is, an i empty minute intermediate code sequence number corresponding to user is that [(i-1) * km+1] is to [i*km];
Step 206, whether an empty minute user i supports Single User MIMO, if supported, proceeds to step 208, otherwise, proceed to step 210;
Step 208, the mode that replaces of take is distributed intermediate code as this sky divides the main transmission block of user i and auxiliary transmission block (or stream 1, stream 2), concrete is treated to: at [(i-1) * km+1], to [i*km] individual intermediate code, by sequence number, be that the midamble allocation that strange (or even) counts is divided the main transmission block (or flowing 1) of user i to this sky, the auxiliary transmission block (or stream 2) of dividing user i to this sky for the midamble allocation of even (or strange) number sequence number, below proceeds to step 210;
Step 210, according to each empty minute user's spreading factor (the above-mentioned sky of take divides user i as example), judge whether that the correction that will carry out intermediate code distributes, if the spreading factor of empty minute user i is less than 16, represent to revise distribution, proceed to step 212, otherwise, distribute the flow process of intermediate code to finish;
Step 212, corresponding to above-mentioned steps 4) in correction batch operation part, that is, and the final intermediate code of dividing user as this sky using first intermediate code of distributing to empty minute user's intermediate code; Particularly, if do not support the user of Single User MIMO, the final intermediate code of dividing user using first intermediate code of distributing to empty minute user's intermediate code in step 204 as this sky; If support the user of Single User MIMO, the intermediate code of dividing user's final primary/secondary transmission block using first intermediate code of intermediate code of distributing to empty minute user's primary/secondary transmission block in step 208 as this sky.
It should be noted that, for convenience of description, in Fig. 2, with the form of step, illustrated and described the technical scheme of embodiment of the method for the present invention, in the step shown in Fig. 2, can in the computer system such as one group of computer executable instructions, carry out.Although figure 2 illustrates logical order, in some cases, can carry out shown or described step with the order being different from herein.
Below in conjunction with concrete scene description processing example of the present invention.
Example one
Fig. 3 is according to the schematic diagram of the channel estimating search window correspondence position of the embodiment of the present invention, as shown in Figure 3, when K=8, current time slots number of users Ku=2, N
sdma=2 skies divide user (SF=16), and two skies divide the long W=P/K=16 of window corresponding to user, and (P is 128, and it is C that these two skies divide the shared spreading code of user
16 (1)～C
16 (16) *16 whole spreading codes, that is, and each empty minute user's code channel number (Ncode
sdma) be 16, wherein, an empty minute user 1 is also Single User MIMO user simultaneously.According to the embodiment of the present invention, for these two skies, divide the flow process of user assignment intermediate code to comprise the steps (301-304):
Step 301, corresponding to above-mentioned steps 1), these two skies divide user according to spreading code separately, are: km_all=[Ncode by the total quantity of the intermediate code being assigned with (km_all)
sdma/ (16/K)]=8;
Step 302, corresponding to above-mentioned steps 2), by sky, divide user's quantity and km_all can obtain the quantity (km) of the intermediate code that each empty minute user can be assigned to: km=[km_all/N
sdma]=4;
Step 303, corresponding to above-mentioned steps 3), be followed successively by order these two skies and divide user assignment intermediate code, that is, the intermediate code of empty minute user's 1 correspondence is m
(1)～m
(4), search for accordingly window for [1,2,3,4]; The intermediate code of empty minute user's 2 correspondences is m
(5)～m
(8), search for accordingly window for [5,6,7,8];
Step 304, divides user 1 intermediate code to proceed to distribute to sky, that is, intermediate code corresponding to the empty minute main transmission block of user 1 (in figure referred to as " main ") is m
1, m
3, that is, the search window that main transmission block is corresponding is [1,3]; The intermediate code that auxiliary transmission block (in figure referred to as " auxiliary ") is corresponding is m
2, m
4, that is, the search window that auxiliary transmission block is corresponding is [2,4].
Because these two skies divide user's SF=16,, do not need to carry out above-mentioned correction batch operation for these two skies divide user, for these two skies divide the process of user assignment intermediate code to complete.
Example two
Based on above-mentioned example one, this example divides number of users N with sky
sdma=4 is example, K=8, and four skies divide the long W=P/K=16 of window corresponding to user (P is 128), SF=16, Ncode
sdma=16, that is, it is C that these four skies divide the shared spreading code of user
16 (1)～C
16 (16) *16 whole spreading codes.
The flow process of the distribution intermediate code of describing according to above-mentioned example one, in this example, distributes intermediate code: m in order successively
(1)～m
(2)for the intermediate code that sky divides user 1 to be assigned to, that is, the search window of empty minute user's 1 correspondence is 1～2; m
(3)～m
(4)for the intermediate code that sky divides user 2 to be assigned to, that is, the search window of empty minute user's 2 correspondences is 3～4; m
(5)～m
(6)for the intermediate code that sky divides user 3 to be assigned to, that is, the search window of empty minute user's 3 correspondences is 5～6; m
(7)～m
(8)for the intermediate code that sky divides user 4 to be assigned to, that is, the search window of empty minute user's 4 correspondences is 7～8.
Example three
Fig. 4 is according to another schematic diagram of the channel estimating search window correspondence position of the embodiment of the present invention, as shown in Figure 4, when K=8, current time slots number of users Ku=4, wherein, empty minute number of users N
sdma=2, it is C that these two skies divide the shared code channel number of user
16 1～C
16 8(SF=16), be designated as user 1, user 2, these two skies divide the long W=P/K=16 of window corresponding to user (P is 128); It is N that non-NULL divides number of users
cdma=2, non-NULL divides the code channel number of CU to be respectively C
16 9～C
16 12and C
16 13～C
16 16, be designated as user 3, user 4.The flow process that is these four user assignment intermediate codes according to the embodiment of the present invention comprises the steps (401-404):
Step 401, corresponding to above-mentioned steps 1) and 2) (or step 301 and step 302), N
sdmaindividual sky divides user to distribute respectively km intermediate code, km=[Ncode
sdma/ (16/K)/N
sdma]=[8/2/2]=2;
Step 402, corresponding to above-mentioned steps 3) (or step 303), according to sequentially dividing user assignment intermediate code for these two skies, m successively
(1)～m
(2)for the intermediate code that user 1 is assigned to, the search window of user's 1 correspondence is 1～2; m
(3)～m
(4)for 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 respectively the individual intermediate code of km ', km '=[4/2]=2;
Step 404, divides user assignment intermediate code, m according to order successively for non-NULL
(5)～m
(6)for the intermediate code that user 3 is assigned to, the search window of user's 3 correspondences is 5～6; m
(7)～m
(8)for 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, empty minute user's quantity N
sdma=2, Ncode
sdma=8, it is C that these two skies divide the shared spreading code of user's (being designated as user 1 and user 2)
2 (1)(SF=2), these two skies divide the long W=P/K=16 of window corresponding to user (P is 128); Non-NULL divides user the quantity N of (being designated as user 3)
cdma=1, Ncode
cdma=8, it is C that non-NULL divides the code channel number of CU
2 (2), the flow process that is these three user assignment intermediate codes according to the embodiment of the present invention comprises the steps (501-506):
Step 501, corresponding to above-mentioned steps 1) and 2) (or step 301 and step 302, or step 401), N
sdmaindividual sky divides user to distribute respectively km intermediate code, km=[Ncode
sdma/ (16/K)/N
sdma]=[8/2/2]=2;
Step 502, corresponding to above-mentioned steps 3) (or step 303 or step 402), according to sequentially dividing user assignment intermediate code for these two skies, m successively
(1)～m
(2)for the intermediate code that user 1 is assigned to, m
(3)～m
(4)the intermediate code being assigned to for user 2;
Step 503, because these two skies divide user's spreading factor to be less than 16, need the intermediate code to distributing in above-mentioned steps 502 to revise distribution,, only need be by first midamble allocation of the intermediate code of distributing in above-mentioned steps 502 to user 1 and user 2, namely, the intermediate code that user 1 distributes 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 respectively the individual intermediate code of km ', km '=4;
Step 505, corresponding to step 404, distributing to the intermediate code that non-NULL divides user is m
(5)～m
(8);
Step 506, because user 3 spreading factor is less than 16, only needs first intermediate code of the intermediate code of distributing in allocation step 505 to 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 present 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 in said method embodiment.
Fig. 5 is according to the block diagram of the distributor of the intermediate code of the embodiment of the present invention, and as shown in Figure 5, this device comprises: acquisition module 1, arithmetic unit 2 and distribution module 3, below be described in detail each module.
Acquisition module 1, for the total quantity of obtaining the quantity of the spendable intermediate code of maximum of system configuration, dividing user for code channel number corresponding to the spread spectrum code word of each empty minute user assignment and a plurality of sky.
Arithmetic unit 2, be connected to acquisition module 1, for the quantity of the spendable intermediate code of maximum of the system configuration obtained according to acquisition module 1, for code channel number corresponding to the spread spectrum code word of each empty minute user assignment and a plurality of sky, divide user's total quantity to be calculated as quantity of the intermediate code of each empty minute user assignment.Particularly, by following formula, calculate the quantity (km) to the intermediate code of each empty minute user assignment:
km＝[Ncode
sdma/(16/K)/N
sdma]，
Wherein, Ncode
sdmathe quantity that is expressed as code channel corresponding to the spread spectrum code word of each empty minute user assignment, K represents the quantity of the spendable intermediate code of maximum of system configuration, N
sdmarepresent that a plurality of skies divide user's total quantity.
Distribution module 3, is connected to arithmetic unit 2, for the result of calculating according to calculator 2, is each empty minute user assignment intermediate code.
By above description, can be found out, by distribution module 3, according to the result of calculation of arithmetic unit 2, be empty minute user assignment intermediate code, overcome the identical situation of the intermediate code that in prior art, the intermediate code based on shown in Fig. 1 divides user assignment intermediate code to cause each empty minute user to adopt with the corresponding relation of spreading code for sky, and then overcome the problem of each intermediate code phase mutual interference causing because intermediate code is identical of the prior art, improved each empty minute subscriber channel estimated quality.
If a plurality of skies divide the one or more skies in user to divide the alone family of User support Multiple Input Multiple Output, distribution module 3 is for after one or more skies divide user assignment intermediate code, distribution module 3 also for: according to pre-defined rule, the intermediate code of distributing to one or more skies and divide user is divided into respectively for the intermediate code of main transmission block with for the intermediate code of auxiliary transmission block.
Above-mentioned pre-defined rule is: for one or more skies, divide each the empty minute user in user, divide midamble allocation that user's intermediate code sequence number is odd number to main transmission block in this sky, divide midamble allocation that user's intermediate code sequence number is even number to auxiliary transmission block in this sky; Or, for one or more skies, divide each the empty minute user in user, divide midamble allocation that user's intermediate code sequence number is even number to main transmission block in this sky, divide midamble allocation that user's intermediate code sequence number is odd number to auxiliary transmission block in this sky.
If empty minute user's spreading factor is less than 16, distribution module 3 is also for dividing user final intermediate code as distributing to this sky for first intermediate code of empty minute user assignment, that is the correction batch operation that, distribution module 3 is also described for said method embodiment.
Correspondingly, for supporting the sky of alone family Multiple Input Multiple Output to divide user, if this sky divides user's spreading factor to be less than 16, distribution module 3 is also for dividing user finally for the intermediate code of main transmission as distributing to this sky first intermediate code of the intermediate code for main transmission block for empty minute user assignment, divides user finally for the intermediate code of auxiliary transmission first intermediate code of the intermediate code for auxiliary transmission block for empty minute user assignment as distributing to this sky.
The implementation of above-mentioned module, can, with reference to the corresponding description in said method embodiment, repeat no more here particularly.
In sum, the embodiment of the present invention is each empty minute user assignment intermediate code according to the quantity of the spendable intermediate code of maximum of system configuration, the total quantity of dividing user for code channel number corresponding to the spread spectrum code word of each empty minute user assignment and a plurality of sky.Than prior art, the present invention can avoid the phase mutual interference between 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 general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (18)
1. a distribution method for the intermediate code based on multi-user multiple input multiple output technology, is used to a plurality of skies to divide user assignment intermediate code, it is characterized in that, described method comprises:
For described a plurality of skies, dividing each the empty minute user in user, is described each empty user assignment intermediate code of dividing according to the quantity of the spendable intermediate code of maximum of system configuration, for this sky divides code channel number corresponding to the spread spectrum code word of user assignment and described a plurality of sky to divide user's total quantity.
2. method according to claim 1, is characterized in that, for described each sky divides the processing of user assignment intermediate code to comprise:
For described each empty minute user, according to the quantity of the spendable intermediate code of maximum of its system configuration with for this sky divides the code channel number corresponding to described spread spectrum code word of user assignment, be defined as the total quantity that described a plurality of sky divides the intermediate code of user assignment;
According to divide total quantity and described a plurality of sky of the intermediate code of user assignment to divide user's total quantity to be defined as the quantity of the intermediate code of described each empty minute user assignment for described a plurality of skies.
3. method according to claim 2, is characterized in that, after having determined the quantity of the intermediate code of dividing user assignment for described each sky, described method also comprises:
Be described each empty minute corresponding intermediate code of user assignment successively continuously.
4. method according to claim 2, is characterized in that, is defined as described a plurality of sky divides the total quantity km_all of the intermediate code of user assignment according to following formula:
Km_all=[Ncode
sdma/ (16/K)], wherein, Ncode
sdmacode channel number corresponding to described spread spectrum code word that is expressed as each empty minute user assignment, K represents the quantity of the spendable intermediate code of maximum 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 empty minute user assignment according to following formula:
Km=[km_all/N
sdma], wherein, km_all is expressed as the total quantity that described a plurality of sky divides the intermediate code of user assignment, N
sdmarepresent that described a plurality of sky divides user's total quantity.
6. method according to claim 3, is characterized in that, for described each sky divides the processing of the intermediate code of user assignment respective numbers to comprise:
According to following formula, be defined as the sequence number that described a plurality of sky divides the intermediate code of i of user empty minute user assignment: [(i-1) * km+m] to [i*km+m-1],
Wherein, km is expressed as the quantity of the intermediate code of each empty minute user assignment, and m represents empty minute intermediate code sequence number corresponding to the initial code channel of user.
7. method according to claim 1, it is characterized in that, if described a plurality of sky divides the one or more skies in user to divide the alone family of User support Multiple Input Multiple Output,, after dividing user assignment intermediate code for described one or more skies, described method also comprises:
For described one or more skies, divide each in user, according to pre-defined rule, the intermediate code of distributing to this sky and divide user is divided into for the intermediate code of main transmission block with for the intermediate code of auxiliary transmission block.
8. method according to claim 7, is characterized in that, it is one of following that described pre-defined rule comprises:
For described one or more skies, divide each the empty minute user in user, divide midamble allocation that user's intermediate code sequence number is odd number to described main transmission block in this sky, divide midamble allocation that user's intermediate code sequence number is even number to described auxiliary transmission block in this sky; Or
For described one or more skies, divide each the empty minute user in user, divide midamble allocation that user's intermediate code sequence number is even number to described main transmission block in this sky, divide midamble allocation that user's intermediate code sequence number is odd number to described auxiliary transmission block in this sky.
9. according to the method described in any one in claim 1 to 6, it is characterized in that, described method also comprises:
For described a plurality of skies, divide each the empty minute user in user, 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 sky, divides user's spreading factor to comprise the described correcting process of carrying out for the intermediate code of its distribution:
If described sky divides user's spreading factor to be less than 16, will as this sky, divide user final intermediate code for first intermediate code of its distribution.
11. according to the method described in claim 7 or 8, it is characterized in that, described method also comprises:
For described a plurality of skies, divide each the empty minute user in user, according to its spreading factor, divide the intermediate code for main transmission block of user assignment and carry out correcting process for the intermediate code of auxiliary transmission block for this sky.
12. methods according to claim 11, is characterized in that, the spreading factor that divides user according to described sky comprises the intermediate code for main transmission block and the described correcting process of carrying out for the intermediate code of auxiliary transmission block:
If described sky divides user's spreading factor to be less than 16, using first intermediate code for the intermediate code for main transmission block of its distribution as this sky, divide user finally for the intermediate code of main transmission, using first intermediate code of the intermediate code for auxiliary transmission block for its distribution as this sky, divide user finally for the intermediate code of auxiliary transmission.
The distributor of 13. 1 kinds of intermediate codes based on multi-user multiple input multiple output technology, is characterized in that, described device comprises:
Acquisition module, for the total quantity of obtaining the quantity of the spendable intermediate code of maximum of system configuration, dividing user for code channel number corresponding to the spread spectrum code word of each empty minute user assignment and a plurality of sky;
Arithmetic unit, divides user's total quantity to be calculated as quantity of the intermediate code of described each empty minute user assignment for the quantity of the spendable intermediate code of maximum of the described system configuration obtained according to described acquisition module, for code channel number corresponding to the spread spectrum code word of described each empty minute user assignment and described a plurality of sky;
Distribution module, for the result of calculating according to described arithmetic unit, is described each empty minute user assignment intermediate code.
14. devices according to claim 13, is characterized in that, described calculator is calculated as the quantity km of the intermediate code of described each empty minute user assignment according to following formula:
km＝[Ncode
sdma/(16/K)/N
sdma]，
Wherein, Ncode
sdmacode channel number corresponding to spread spectrum code word that is expressed as each empty minute user assignment, K represents the quantity of the spendable intermediate code of maximum of described system configuration, N
sdmarepresent that described a plurality of sky divides user's total quantity.
15. devices according to claim 13, it is characterized in that, if described a plurality of sky divides the one or more skies in user to divide the alone family of User support Multiple Input Multiple Output, described distribution module is for after described one or more skies divide user assignment intermediate code, described distribution module also for: according to pre-defined rule, the intermediate code of distributing to described one or more sky and divide user is divided into respectively for the intermediate code of main transmission block with for the intermediate code of auxiliary transmission block.
16. devices according to claim 15, is characterized in that, it is one of following that described pre-defined rule comprises:
For described one or more skies, divide each the empty minute user in user, divide midamble allocation that user's intermediate code sequence number is odd number to described main transmission block in this sky, divide midamble allocation that user's intermediate code sequence number is even number to described auxiliary transmission block in this sky; Or
For described one or more skies, divide each the empty minute user in user, divide midamble allocation that user's intermediate code sequence number is even number to described main transmission block in this sky, divide midamble allocation that user's intermediate code sequence number is odd number to described auxiliary transmission block in this sky.
17. according to the device described in claim 13 or 14, it is characterized in that,
If described sky divides user's spreading factor to be less than 16, described distribution module is also for dividing first intermediate code of user assignment to divide user final intermediate code as distributing to this sky for described sky.
18. according to the device described in claim 15 or 16, it is characterized in that,
If described sky divides user's spreading factor to be less than 16, described distribution module is also for dividing first intermediate code of the intermediate code for main transmission block of user assignment to divide user finally for the intermediate code of main transmission as distributing to this sky for described sky, will for described sky, divide first intermediate code of the intermediate code for auxiliary transmission block of user assignment to divide user finally for the intermediate code of auxiliary transmission as distributing to this sky.
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