CN102801513B - Resource impact, code division multiplexing method and device - Google Patents
Resource impact, code division multiplexing method and device Download PDFInfo
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- CN102801513B CN102801513B CN201210008651.6A CN201210008651A CN102801513B CN 102801513 B CN102801513 B CN 102801513B CN 201210008651 A CN201210008651 A CN 201210008651A CN 102801513 B CN102801513 B CN 102801513B
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Abstract
The invention discloses a kind of resource impact, code division multiplexing method and device, belong to the communications field.The method for mapping resource includes：A kind of mapping scheme is selected at least two mapping schemes, the frequency pilot sign with most strong transmission power corresponding to mapping scheme that the frequency pilot sign with most strong transmission power corresponding to selected mapping scheme is selected with least one neighbor cell mutually staggers in frequency and/or on the time；Resource impact is carried out according to the mapping scheme of selection.The present invention selects a kind of mapping scheme by each cell at least two mapping schemes, realizes resource impact, effectively reduces the interference that the frequency pilot sign of cell boundary users is subject to；Exchanged by entering row vector to orthogonal matrix, obtain multiple different codeword sequences, realized that code word is designed, the power output imbalance problem of frequency pilot sign can be effectively improved.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of resource impact, code division multiplexing method and device.
Background technology
In LTE (Long Term Evolution, Long Term Evolution) technology, transmitting terminal is supplied to receiving terminal frequency pilot sign,
Receive channel estimation value of the end user device according to required for the frequency pilot sign received can obtain user data demodulation.And be
Ensure the transmission of frequency pilot sign, it is necessary to resource impact is carried out, to determine space level number, the frequency pilot sign institute of transmitted pilot symbol
Corresponding relation between the code word that subcarrier and frequency pilot sign are used.And for the code word in resource impact, can have a variety of
Design.
Prior art is when realizing resource impact, and each cell uses identical mapping scheme, and prior art is carrying out code
When dividing multiplexing, each frequency pilot sign uses same codeword sequence on sub-carriers.
For resource impact, because each cell uses identical mapping scheme, the pilot tone of cell boundary users will be caused
Symbol is by compared with strong jamming；And when carrying out code word design, by each frequency pilot sign uses same code word on sub-carriers,
Then there is the power output imbalance problem of frequency pilot sign.
The content of the invention
In order to reduce the interference that the frequency pilot sign of cell boundary users is subject to, the power output for improving frequency pilot sign is uneven
Problem, the embodiments of the invention provide a kind of resource impact, code division multiplexing method and device.The technical scheme includes such as lower section
Face：
1st, a kind of method for mapping resource, including：
A kind of mapping scheme is selected in default at least two mapping scheme, corresponding to the selected mapping scheme
The mapping scheme that is selected with least one neighbor cell of the frequency pilot sign with most strong transmission power corresponding to have it is most strong
The frequency pilot sign of transmission power mutually staggers in frequency and/or on the time；
Resource impact is carried out according to the mapping scheme of selection；
Wherein, mapping scheme uses for space level number, the frequency pilot sign of transmitted pilot symbol code word and frequency pilot sign institute
Corresponding relation between subcarriers.
2nd, the method according to aspect 1, selects a kind of mapping scheme in default at least two mapping scheme, bag
Include：
According to cell ID, a kind of mapping scheme is selected in default at least two mapping scheme.
3rd, the method according to aspect 1 or 2, frequency division multiplexing or time-multiplexed frequency pilot sign corresponding to mapping scheme
Using identical scrambler sequence, and/or use different code division multiplexing codeword sequences.
4th, a kind of resource mapping apparatus, including：
Memory module, for storing at least two mapping schemes, the mapping scheme is the space layer of transmitted pilot symbol
Number, the code word that uses of frequency pilot sign and frequency pilot sign corresponding relation between subcarriers；
Selecting module, for selecting a kind of mapping scheme at least two mapping schemes that the memory module is stored,
Frequency pilot sign with most strong transmission power and reflecting that at least one neighbor cell is selected corresponding to selected mapping scheme
The frequency pilot sign with most strong transmission power corresponding to scheme is penetrated in frequency and/or on the time mutually to stagger；
Mapping block, the mapping scheme for being selected according to the selecting module carries out resource impact；
Wherein, mapping scheme uses for space level number, the frequency pilot sign of transmitted pilot symbol code word and frequency pilot sign institute
Corresponding relation between subcarriers.
5th, the device according to aspect 4, selecting module, specifically for according to cell ID, being stored in memory module
A kind of mapping scheme is selected at least two mapping schemes.
6th, a kind of code division multiplexing method, including：
Enter row vector to selected orthogonal matrix to exchange, obtain multiple different codeword sequences；
Determine the corresponding relation of the multiple different codeword sequence and each pilot sub-carrier；
It is on each described pilot sub-carrier, the frequency pilot sign of each space layer is corresponding according to each pilot sub-carrier
Codeword sequence is multiplexed.
7th, the method according to aspect 6, enters row vector to selected orthogonal matrix and exchanges, obtain multiple different code words
Sequence includes：
For any 4 dimension orthogonal matrix W, if A=W (：, 1), B=W (：, 2), C=W (：, 3), D=W (：, 4)；
Wherein, W (：, the corresponding column vector of orthogonal matrix W m row m) is represented, m is 1 to 4, then enters orthogonal matrix W
Ranks vector is exchanged, and is obtained 4 kinds of different codeword sequences, is respectively：
W1=[A, B, C, D]；
W2=[B, A, D, C]；
W3=[C, D, A, B], or, [C, D, B, A]；
W4=[D, C, B, A], or, [D, C, A, B]；
Correspondingly, the corresponding relation of the multiple different codeword sequence and each pilot sub-carrier is determined, is specifically included：
For pilot sub-carrier n1, using codeword sequence W1；
For pilot sub-carrier n2, using codeword sequence W2；
For pilot sub-carrier n3, using codeword sequence W3；
For pilot sub-carrier n4, using codeword sequence W4；
For pilot sub-carrier n5, using codeword sequence W1；
For pilot sub-carrier n6, using codeword sequence W2；
And be repeated in down；Wherein, the n is the positive integer more than zero.
8th, the method according to aspect 6, enters row vector to selected orthogonal matrix and exchanges, obtain multiple different code words
Sequence, including：
For any 4 dimension orthogonal matrix W, if A`=W` (1,：), B`=W` (2,：), C`=W` (3,：), D`=W`
(4,：)；
Wherein, W` (m,：) row vector corresponding to orthogonal matrix w m rows is represented, m is 1 to 4, then by orthogonal matrix W
Row vector exchange is carried out, 4 kinds of different codeword sequences is obtained, is respectively：
Or, Or,
Correspondingly, the corresponding relation of the multiple different codeword sequence and each pilot sub-carrier is determined, is specifically included：
For pilot sub-carrier n1, using codeword sequence W1`；
For pilot sub-carrier n2, using codeword sequence W2`；
For pilot sub-carrier n3, using codeword sequence W3`；
For pilot sub-carrier n4, using codeword sequence W4`；
For pilot sub-carrier n5, using codeword sequence W1`；
For pilot sub-carrier n6, using codeword sequence W2`；
And be repeated in down；Wherein, the n is the positive integer more than zero.
9th, a kind of code word design device, including：
Acquisition module, exchanges for entering row vector to selected orthogonal matrix, obtains multiple different codeword sequences；
Determining module, for determining multiple different codeword sequences that the acquisition module is obtained and each pilot sub-carrier
Corresponding relation；
Multiplexing module, in each described pilot sub-carrier, by the frequency pilot sign of each space layer according to described each
The corresponding codeword sequence of individual pilot sub-carrier is multiplexed.
10th, the device according to aspect 9, acquisition module, specifically for the orthogonal matrix W for any 4 dimensions, if A=W
(：, 1), B=W (：, 2), C=W (：, 3), D=W (：, 4)；
Wherein, W (：, the corresponding column vector of orthogonal matrix W m row m) is represented, m is 1 to 4, then enters orthogonal matrix W
Ranks vector is exchanged, and is obtained 4 kinds of different codeword sequences, is respectively：
W1=[A, B, C, D]；
W2=[B, A, D, C]；
W3=[C, D, A, B], or, [C, D, B, A]；
W4=[D, C, B, A], or, [D, C, A, B]；
Correspondingly, the determining module, specifically for
For pilot sub-carrier n1, using codeword sequence W1；
For pilot sub-carrier n2, using codeword sequence W2；
For pilot sub-carrier n3, using codeword sequence W3；
For pilot sub-carrier n4, using codeword sequence W4；
For pilot sub-carrier n5, using codeword sequence W1；
For pilot sub-carrier n6, using codeword sequence W2；
And be repeated in down；Wherein, the n is the positive integer more than zero.
11st, the device according to aspect 9, acquisition module, specifically for the orthogonal matrix W for any 4 dimensions, if A`=
W` (1,：), B`=W` (2,：), C`=W` (3,：), D`=W` (4,：)；
Wherein, W` (m,：) row vector corresponding to orthogonal matrix w m rows is represented, m is 1 to 4, then by orthogonal matrix W
Row vector exchange is carried out, 4 kinds of different codeword sequences is obtained, is respectively：
Or, Or,
Correspondingly, the determining module, specifically for
For pilot sub-carrier n1, using codeword sequence W1`；
For pilot sub-carrier n2, using codeword sequence W2`；
For pilot sub-carrier n3, using codeword sequence W3`；
For pilot sub-carrier n4, using codeword sequence W4`；
For pilot sub-carrier n5, using codeword sequence W1`；
For pilot sub-carrier n6, using codeword sequence W2`；
And be repeated in down；Wherein, the n is the positive integer more than zero.
The beneficial effect of technical scheme provided in an embodiment of the present invention is：
A kind of mapping scheme is selected at least two mapping schemes by each cell, resource impact is realized, due to quilt
The mapping that the frequency pilot sign with most strong transmission power corresponding to the mapping scheme of selection is selected with least one neighbor cell
The frequency pilot sign with most strong transmission power corresponding to scheme mutually staggers in frequency and/or on the time, then can effectively reduce
The interference that the pilot signal of cell boundary users is subject to；In addition, being exchanged by entering row vector to selected orthogonal matrix, obtain many
Individual different codeword sequence, and the corresponding relation between each pilot sub-carrier and multiple different codeword sequences is determined, can have
Effect improves the power output imbalance problem of frequency pilot sign.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, makes required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the method for mapping resource flow chart that the embodiment of the present invention one is provided；
Fig. 2 is the structural representation for the time/frequency source block that the embodiment of the present invention two is provided；
Fig. 3 is the method for mapping resource flow chart that the embodiment of the present invention two is provided；
Fig. 4 is the structural representation for the resource mapping apparatus that the embodiment of the present invention three is provided；
Fig. 5 is the code division multiplexing method flow chart that the embodiment of the present invention four is provided；
Fig. 6 is the code division multiplexing schematic diagram that the embodiment of the present invention five is provided；
Fig. 7 is the code division multiplexing method flow chart that the embodiment of the present invention five is provided；
Fig. 8 is the structural representation for the code division multiplexing device that the embodiment of the present invention six is provided.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
Referring to Fig. 1, a kind of method for mapping resource is present embodiments provided, this method flow is specific as follows：
101：A kind of mapping scheme is selected in default at least two mapping scheme, corresponding to selected mapping scheme
The mapping scheme that is selected with least one neighbor cell of the frequency pilot sign with most strong transmission power corresponding to have it is most strong
The frequency pilot sign of transmission power mutually staggers in frequency and/or on the time；
102：Resource impact is carried out according to the mapping scheme of selection.
The method that the present embodiment is provided, a kind of map is selected by each cell in default at least two mapping scheme
Scheme, realizes resource impact, due to the frequency pilot sign corresponding to selected mapping scheme with most strong transmission power with extremely
The frequency pilot sign with most strong transmission power corresponding to the mapping scheme of few neighbor cell selection is in frequency and/or time
On mutually stagger, then can effectively reduce the interference that the frequency pilot sign of cell boundary users is subject to.
Embodiment two
A kind of method for mapping resource is present embodiments provided, for convenience of description, the present embodiment is provided with the time-frequency shown in Fig. 2
Exemplified by source block, and subcarrier where frequency pilot sign is referred to as pilot sub-carrier, the method for mapping resource that the present embodiment is provided is entered
Row explanation.
In Fig. 2, a subframe includes 2 slot (time slot), there is 7 OFDM (Orthogonal in each slot
Frequency Division Multiplexing, OFDM) symbol；In each slot, 12x7 RE is had
(Resource Element, resource particle).The resource block use pilot resource distribution method be：CDM is introduced in time domain
(Code Division Multiplexing, code division multiplexing), can provide first in 4 orthogonal pilot resources, such as Fig. 2
Resource particle；FDM (Frequency Division Multiplexing, frequency division multiplexing) is introduced on frequency domain, can also be provided
Second resource particle in 4 orthogonal pilot resources, such as Fig. 2.For the pilot resources method of salary distribution shown in Fig. 2, existing skill
Art is when carrying out resource impact, and each cell uses identical mapping scheme, by taking the mapping scheme shown in table 1 below as an example：
Table 1
| Space level number | L1 | L2 | L3 | L4 | L5 | L6 | L7 | L8 |
| First RE code word | C1 | C2 | C3 | C4 | ||||
| 2nd RE code word | C1 | C2 | C3 | C4 |
Mapping scheme according to table 1, for example：When it is 3 that number of plies RANK is always transmitted in space, according to above-mentioned table 1
Shown mapping relations, it will have 2 space layers to be transmitted on the first RE, have 1 space layer to be transmitted on the 2nd RE.If each sky
The transimission power of interbed is equal, and is the 1/3 of data RE mean powers, then：
The transmission power of dedicated pilot resource on first RE is：(P/3+P/3) * beta=beta*P*2/3；
The transmission power of dedicated pilot resource on 2nd RE is：(P/3) * beta=beta*P/3；
Wherein, beta represents the power adjusting factor of pilot tone, and P represents data RE mean power.Now, it is special on the first RE
It it is 2 times of the transmission power of dedicated pilot resource on the 2nd RE with the transmission power of pilot resources.
It should be noted that：How the power adjusting factor of pilot tone is set, is prior art, the present embodiment does not make specific limit
It is fixed.When the present embodiment is only with RANK ＞ 2, the power adjusting factor beta=2 of pilot tone is set, otherwise said exemplified by beta=1
It is bright.
Further, for the boundary user of neighbor cell, due to SINR (Signal to Interference
Plus Noise Ratio, Signal to Interference plus Noise Ratio) than relatively low, it will usually use the total number of plies RANK=1 of space propagation or 2 transmission side
Formula.According to the mapping scheme shown in above-mentioned table 1, the user can take the first RE resource transmission dedicated pilot.
If setting cell 1 and neighbor cell 2 all selecting mapping scheme shown in above-mentioned table 1, for the boundary user of cell 1
For, the general transmission plan using Rank=1 or 2, the then such as table 2 below of the jamming power from cell 2 that frequency pilot sign is subject to
It is shown：
Table 2
In table 2, P represents data RE mean power, when the RANK ＞ 2 of cell 2, sets the power adjustment of pilot tone
Factor beta=2, otherwise beta=1.When the total number of plies of space propagation (RANK) is 1,2,3,5 and 7, then in the first RE
On will transmit more space numbers of plies, that is, take more power resources, and the corresponding resource of adjacent cell is produced
Larger interference.In analysis below, the present embodiment will take that power resource is more, and the corresponding resource of adjacent cell is produced
The frequency pilot sign of raw larger interference is referred to as the frequency pilot sign with most strong transmission power, by the pilot tone where such frequency pilot sign
Subcarrier is referred to as the pilot sub-carrier with most strong transmission power.
In order to reduce the interference that the frequency pilot sign of cell boundary users is subject to, a kind of resource impact side is present embodiments provided
Method, referring to Fig. 3, exemplified by presetting two kinds of mapping schemes, this method flow is specific as follows：
301：A kind of mapping scheme is selected in default two kinds of mapping schemes, corresponding to the selected mapping scheme
There is most strong hair corresponding to the mapping scheme that frequency pilot sign with most strong transmission power is selected with least one neighbor cell
The frequency pilot sign of power is penetrated in frequency and/or on the time mutually to stagger；
Wherein, mapping scheme uses for space level number, the frequency pilot sign of transmitted pilot symbol code word and frequency pilot sign institute
Corresponding relation between subcarriers.Still by taking the resource block shown in Fig. 2 as an example, can set mapping scheme A as shown in Table 3 below and
Mapping scheme B shown in table 4：
Table 3
| Space level number | L1 | L2 | L3 | L4 | L5 | L6 | L7 | L8 |
| First RE code word | C1 | C2 | C3 | C4 | ||||
| 2nd RE code word | C1 | C2 | C3 | C4 |
Table 4
| Space level number | L1 | L2 | L 3 | L4 | L5 | L6 | L7 | L8 |
| First RE code word | C1 | C2 | C3 | C4 | ||||
| 2nd RE code word | C1 | C2 | C3 | C4 |
Specifically, when selecting a kind of mapping scheme in default two kinds of mapping schemes, each cell can be according to Cell ID
(cell ID) is selected, for example：
If cell ID mod 2=0, the mapping scheme A shown in selection table 3；
If cell ID mod 2=1, the mapping scheme B shown in selection table 4.
If the Choose for user option A of cell 1, and the Choose for user option b of neighbor cell 2.
302：Resource impact is carried out according to the mapping scheme of selection.
For the step, carry out after resource impact, then during pilot symbol transmission, used for the border of cell 1
For family, the general transmission plan using Rank=1 or 2, the jamming power from cell 2 being subject to is as shown in Table 5 below：
Table 5
As shown in table 5, P represents data RE mean power, when the RANK ＞ 2 of cell 2, sets the power of pilot tone
Dynamic gene beta=2, otherwise beta=1.As can be seen from Table 5：The mapping scheme provided using the present embodiment, cell 1
On the frequency pilot sign of boundary user, the Pilot Interference power from neighbor cell 2 can be reduced effectively.
Further, in the resource block shown in Fig. 2, the code word in code word and the 2nd RE on the first RE can be different.
I.e. the frequency pilot sign of frequency division multiplexing uses different codeword sequences, for example, by taking the mapping scheme shown in table 6 below as an example, code word
Cm (m=1-4) and Dm (m=1-4) can be different.
Table 6
| Space level number | L1 | L2 | L3 | L4 | L5 | L6 | L7 | L8 |
| First RE code word | C1 | C2 | C3 | C4 | ||||
| 2nd RE code word | D1 | D2 | D3 | D4 |
If following code word can be used on the RE of cell 1 the oneth：
[1,1,1,1；
1, -1,1, -1；
1,1, -1, -1；
1, -1, -1,1]
And the different displacements of above-mentioned code word can be used on the 2nd RE, for example：
[1,1,1,1；
- 1,1, -1,1；
- 1,1,1, -1；
1,1, -1, -1]
Advantage of this is that：When using cell-specific scramblers, if the scrambler that is used on the first RE and the
Identical scrambler is used using the frequency pilot sign of identical scrambler, i.e. frequency division multiplexing on two RE, then on the first RE and on the 2nd RE
The intersymbol interference from adjacent cell being subject to is different, can so improve detection performance.
Further, the code word that the frequency pilot sign of neighbor cell is used can also be different, and the present embodiment is not made to this
It is specific to limit.
The method that the present embodiment is provided, a kind of mapping scheme is selected by each cell at least two mapping schemes,
Resource impact is realized, due to the frequency pilot sign corresponding to selected mapping scheme with most strong transmission power and at least one
The frequency pilot sign with most strong transmission power corresponding to the mapping scheme of neighbor cell selection frequency and/or on the time it is mutual
Stagger, then can effectively reduce the interference that the frequency pilot sign of cell boundary users is subject to；Further, since the side that the present embodiment is provided
Method, also supports frequency division multiplexing or time-multiplexed frequency pilot sign to use identical scrambler sequence, and/or different codeword sequences,
Therefore, it is different by the intersymbol interference of neighbor cell in pilot tone, and then detection performance can be improved.
Embodiment three
Referring to Fig. 4, a kind of resource mapping apparatus is present embodiments provided, the device includes：
Memory module 401, for storing at least two mapping schemes, mapping scheme is the space layer of transmitted pilot symbol
Number, the code word that uses of frequency pilot sign and frequency pilot sign corresponding relation between subcarriers；
Selecting module 402, for selecting a kind of mapping side at least two mapping schemes that memory module 401 is stored
Case, what the frequency pilot sign with most strong transmission power corresponding to selected mapping scheme was selected with least one neighbor cell
The frequency pilot sign with most strong transmission power corresponding to mapping scheme mutually staggers in frequency and/or on the time；
Mapping block 403, the mapping scheme for being selected according to selecting module 402 carries out resource impact.
Specifically, selecting module 402, specifically for being reflected according to cell ID, at least two in the storage of memory module 402
Penetrate in scheme and select a kind of mapping scheme.
Preferably, frequency division multiplexing or time-multiplexed frequency pilot sign use identical scrambler sequence, and/or using different
Codeword sequence.
The device that the present embodiment is provided, a kind of mapping scheme is selected by each cell at least two mapping schemes,
Resource impact is realized, due to the frequency pilot sign corresponding to selected mapping scheme with most strong transmission power and at least one
The frequency pilot sign with most strong transmission power corresponding to the mapping scheme of neighbor cell selection frequency and/or on the time it is mutual
Stagger, then can effectively reduce the interference that the frequency pilot sign of cell boundary users is subject to；Further, since the side that the present embodiment is provided
Method, also supports frequency division multiplexing or time-multiplexed frequency pilot sign to use identical scrambler sequence, and/or different codeword sequences,
Therefore, it is different by the intersymbol interference of neighbor cell in pilot tone, and then detection performance can be improved.
Example IV
Referring to Fig. 5, a kind of code division multiplexing method is present embodiments provided, this method flow is specific as follows：
501：Enter row vector to selected orthogonal matrix to exchange, obtain multiple different codeword sequences；
502：Determine the corresponding relation of multiple different codeword sequences and each pilot sub-carrier；
503：It is on each pilot sub-carrier, the frequency pilot sign of each space layer is corresponding according to each pilot sub-carrier
Codeword sequence is multiplexed.
The method that the present embodiment is provided, is exchanged by entering row vector to selected orthogonal matrix, obtains multiple different codes
Word sequence, and the corresponding relation between each pilot sub-carrier and multiple different codeword sequences is determined, make each pilot tone son load
Ripple uses different codeword sequences, can be effectively improved the power output imbalance problem of frequency pilot sign.
Embodiment five
A kind of code division multiplexing method is present embodiments provided, for convenience of description, the present embodiment is with the resource block shown in Fig. 6
Exemplified by, the method that the present embodiment is provided is described in detail.
In Fig. 6, a subframe includes 2 slot (time slot), there is 7 OFDM symbols in each slot；At each
In slot, 12x7 RE is had.The resource block use pilot resource distribution method be：CDM is introduced in time domain, can be provided
4 orthogonal pilot resources.Prior art is when designing code word, in subcarrier n1, n1+5, on n1+10, using same CDM
Code word (C1-C4).
By taking 4x4 Walsh matrix as an example, for example：
C=[1,1,1,1；
1, -1,1, -1；
1,1, -1, -1；
1, -1, -1,1]
If C1 is the first row of Matrix C, i.e. C1=C (1,：).Similarly, if C2=C (2,：), C 3=C (3,：), C4=
C (4,：).
For Fig. 6, for the Main Analysis scene of unbalanced power, it is considered to broadband spatial pretreatment vector, i.e., for every
For one space layer, vector is pre-processed using identical space on each subcarrier.By taking 8 transmitting antennas as an example, if space layer m
Dedicated pilot symbol carried and transmitted on code word Cm (m=1-4), then on any one pilot sub-carrier, send
The frequency pilot sign matrix at end is：
Wherein, wijIt is that jth (j=1-4) layer transmits the weight coefficient on i-th (i=1-8) individual transmitting antenna, s is pilot tone
Symbol, CijIt is code word Ci(i=1-4) jth (j=1-4) individual symbol.
As can be seen that being for the frequency pilot sign vector on i-th (i=1-8) individual transmitting antenna from above formula：
Wherein, symbol Pki, (k=1-4) is passed in the OFDM symbol 6,7,13 and 14 of i-th of transmitting antenna respectively
It is defeated.
For different i and j, it is contemplated that the vectorial coefficient w of space pretreatmentijIt is usually different, with reference to code word matrix C's
Orthogonality, i.e., for different i and j, then C (：, i) be not equal to C (：, j), therefore can release：Frequency pilot sign Pki, (k=1-4)
4 usually different numerical value.That is：On any one pilot sub-carrier, sent out in OFDM symbol 6,7,13 and 14
The frequency pilot sign sent is different.
Further, it is contemplated that using the pilot tone that same space pretreatment vector sum is same on all pilot sub-carriers
Code word, now, on each Pilot OFDM symbols, pilot tone RE power sum is respectively：
P6=∑ (| p1i|2)；
P7=∑ (| p2i|2)；
P13=∑ (| p3i|2)；
P14=∑ (| p4i|2)；
Wherein, PmRepresent on Pilot OFDM symbols m (herein, m=6,7,13,14), all pilot tone RE power it
With.According to above-mentioned analysis it is recognised that generally：
P6≠P7≠P13≠P14
That is：On each Pilot OFDM symbols, there is the power output imbalance problem of pilot tone.
In order to solve the power output imbalance problem of pilot tone, a kind of code word design method is present embodiments provided, referring to
Fig. 7, the method flow that the present embodiment is provided is specific as follows：
701：Column vector exchange is carried out to 4 selected orthogonal dimension matrixes, 4 different codeword sequences are obtained；
Wherein, for convenience of description, by taking 4x4Walsh matrixes as an example, such as：
Orthogonal matrix W=[1,1,1,1；
1, -1,1, -1；
1,1, -1, -1；
1, -1, -1,1]
If A=W (：, 1), B=W (：, 2), C=W (：, 3), D=W (：, 4).
Column vector exchange then is carried out to orthogonal matrix W, orthogonal matrix W four kinds of transformation matrixs is obtained, is respectively：
W1=[A, B, C, D]；
W2=[B, A, D, C]；
W3=[C, D, A, B], or, [C, D, B, A]；
W4=[D, C, B, A], or, [D, C, A, B]；
702：Determine the corresponding relation of 4 different codeword sequences and each pilot sub-carrier；
Specifically, the 4 different codeword sequences obtained according to above-mentioned steps 701,4 different codeword sequences and each
Individual pilot sub-carrier can use following corresponding relation：
For pilot sub-carrier n1, using codeword sequence W1；
For pilot sub-carrier n2, using codeword sequence W2；
For pilot sub-carrier n3, using codeword sequence W3；
For pilot sub-carrier n4, using codeword sequence W4；
For pilot sub-carrier n5, using codeword sequence W1；
For pilot sub-carrier n6, using codeword sequence W2；
And be repeated in down.
Wherein：In pilot sub-carrier n1, n2 ... on, the frequency pilot sign of these space layers is multiplexed by CDM codes.
703：It is on each pilot sub-carrier, the frequency pilot sign of each space layer is corresponding according to each pilot sub-carrier
Codeword sequence is multiplexed.
The code division multiplexing method provided for the present embodiment, when solving the power output imbalance problem of frequency pilot sign,
Concrete analysis is as follows：
Space broadband pretreatment vector is considered, still by taking 8 transmitting antennas as an example.As shown in fig. 6, on subcarrier n1, if empty
Interbed m (m=1-4) dedicated pilot symbol code word W 1 (m,：) on carried and transmitted, then the transmitting terminal on subcarrier n1
Frequency pilot sign matrix be：
Wherein wijIt is that jth (j=1-4) layer transmits the weight coefficient on i-th (i=1-8) individual transmitting antenna, s is pilot tone
Symbol.
As can be seen from the above equation, the frequency pilot sign vector on i-th (i=1-8) individual transmitting antenna is：
Wherein, symbol Pki, (k=1-4) is carried out on the Pilot OFDM symbols 6,7,13 and 14 of i-th of transmitting antenna respectively
Transmission.
According to W2 and W1 corresponding relation, it can release on pilot sub-carrier n2, corresponding i-th (i=1-8) individual transmitting
Frequency pilot sign vector on antenna is：[p2i p1i p4i p3i].Similar, it can release：
On pilot sub-carrier n3, the frequency pilot sign vector on corresponding i-th (i=1-8) individual transmitting antenna is：[p3i
p4i p1i p2i]；
On pilot sub-carrier n4, the frequency pilot sign vector on corresponding i-th (i=1-8) individual transmitting antenna is：[p4i
p3i p2i p1i]。
If pilot sub-carrier number is 4 integral multiple, it can release：On corresponding i-th (i=1-8) individual transmitting antenna,
In each Pilot OFDM symbols, i.e. OFDM symbol 6,7,13 and 14, the power sum on all pilot tone RE is equal, i.e.,：
P6=P7=P13=P14=∑ (| p1i|2+|p2i|2+|p3i|2+|p4i|2)
Wherein, PmRepresent on Pilot OFDM symbols m (herein, m=6,7,13,14), all pilot tone RE power it
With.Now, it is unbalanced this addresses the problem pilot output power because the power output of each Pilot OFDM symbols is all equal
Problem.
Further, if pilot sub-carrier number is not 4 integral multiple, in each Pilot OFDM symbols, i.e. OFDM symbol 6,
On 7,13,14, pilot tone RE power sum is also more or less the same, and the power output imbalance problem of pilot tone will also obtain very big change
It is kind.
For example：If pilot sub-carrier number is 5, it can release：On each Pilot OFDM symbols 6,7,13,14, pilot tone RE
Power sum be respectively：
P6=(| p1i|2+|p2i|2+|p3i|2+|p4i|2)+|p1i|2；
P7=(| p1i|2+|p2i|2+|p3i|2+|p4i|2)+|p2i|2；
P13=(| p1i|2+|p2i|2+|p3i|2+|p4i|2)+|p3i|2；
P14=(| p1i|2+|p2i|2+|p3i|2+|p4i|2)+|p4i|2；
It can be seen that from above formula：On each Pilot OFDM symbols 6,7,13,14, pilot tone RE power sum differs only by one
, it therefore, it can improve the unbalanced power problem of pilot tone output.
Alternatively, except carrying out column vector exchange to selected orthogonal matrix, multiple different codeword sequences is obtained, may be used also
To carry out row vector exchange to selected orthogonal matrix, multiple different codeword sequences are obtained.The present embodiment is not to orthogonal matrix
Vectorial exchanging form specifically limited.Below, still by taking 4 orthogonal dimension matrix Ws as an example, row vector friendship is carried out to orthogonal matrix
Change, obtain 4 different codeword sequences and illustrate, then for the orthogonal matrix W of any 4 dimensions, if A`=W` (1,：), B`=W
` (2,：), C`=W` (3,：), D`=W` (4,：)；
Wherein, W` (m,：) (m=1..4) represent W matrixes m rows corresponding to row vector；Every trade is entered to orthogonal matrix W
Vector is exchanged, and four kinds of obtained transformation matrixs are respectively：
Or, Or,
Correspondingly, the corresponding relation of each pilot sub-carrier codeword sequence different from 4 is as follows：
For pilot sub-carrier n1, using codeword sequence W1`；
For pilot sub-carrier n2, using codeword sequence W2`；
For pilot sub-carrier n3, using codeword sequence W3`；
For pilot sub-carrier n4, using codeword sequence W4`；
For pilot sub-carrier n5, using codeword sequence W1`；
For pilot sub-carrier n6, using codeword sequence W2`；
And be repeated in down.
The method that the present embodiment is provided, is exchanged by entering row vector to selected orthogonal matrix, obtains multiple different codes
Word sequence, and the corresponding relation between each pilot sub-carrier and multiple different codeword sequences is determined, make each pilot tone son load
Ripple uses different codeword sequences, so as to be effectively improved the power output imbalance problem of frequency pilot sign.
Embodiment six
Referring to Fig. 8, a kind of code division multiplexing device is present embodiments provided, the device includes：
Acquisition module 801, exchanges for entering row vector to selected orthogonal matrix, obtains multiple different codeword sequences；
Determining module 802, for determining multiple different codeword sequences that acquisition module is obtained and each pilot sub-carrier
Corresponding relation；
Multiplexing module 803, in each pilot sub-carrier, by the frequency pilot sign of each space layer according to each pilot tone
The corresponding codeword sequence of subcarrier is multiplexed.
Wherein, acquisition module 801, specifically for the orthogonal matrix W for any 4 dimensions,
If A=W (：, 1), B=W (：, 2), C=W (：, 3), D=W (：, 4)；
Wherein, W (：, the corresponding column vector of orthogonal matrix W m row m) is represented, m is 1 to 4, then enters orthogonal matrix W
Ranks vector is exchanged, and is obtained 4 kinds of different codeword sequences, is respectively：
W1=[A, B, C, D]；
W2=[B, A, D, C]；
W3=[C, D, A, B], or, [C, D, B, A]；
W4=[D, C, B, A], or, [D, C, A, B]；
Correspondingly, determining module 802, specifically for
For pilot sub-carrier n1, using codeword sequence W1；
For pilot sub-carrier n2, using codeword sequence W2；
For pilot sub-carrier n3, using codeword sequence W3；
For pilot sub-carrier n4, using codeword sequence W4；
For pilot sub-carrier n5, using codeword sequence W1；
For pilot sub-carrier n6, using codeword sequence W2；
And be repeated in down.
Alternatively, acquisition module 801, specifically for for any 4 dimension orthogonal matrix W, if A`=W` (1,：), B`=W
` (2,：), C`=W` (3,：), D`=W` (4,：)；
Wherein, W` (m,：) (m=1..4) represent row vector corresponding to orthogonal matrix w m rows, m is 1 to 4, then will
Orthogonal matrix W carries out row vector exchange, obtains 4 kinds of different codeword sequences, is respectively：
Or, Or,
Correspondingly, determining module 802, specifically for
For pilot sub-carrier n1, using codeword sequence W1`；
For pilot sub-carrier n2, using codeword sequence W2`；
For pilot sub-carrier n3, using codeword sequence W3`；
For pilot sub-carrier n4, using codeword sequence W4`；
For pilot sub-carrier n5, using codeword sequence W1`；
For pilot sub-carrier n6, using codeword sequence W2`；
And be repeated in down.
In summary, the device that the present embodiment is provided, is exchanged by entering row vector to selected orthogonal matrix, obtains multiple
Different codeword sequences, and the corresponding relation between each pilot sub-carrier and multiple different codeword sequences is determined, make each
Pilot sub-carrier uses different codeword sequences, so as to be effectively improved the unbalanced power problem caused by pilot tone.
The embodiments of the present invention are for illustration only, and the quality of embodiment is not represented.
All or part of step in the embodiment of the present invention, it is possible to use software realizes that corresponding software program can be deposited
Storage is in the storage medium that can be read, such as CD or hard disk.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (6)
1. a kind of processing method of frequency pilot sign, it is characterised in that including：
User equipment receives the frequency pilot sign that transmitting terminal is sent；
Wherein, the frequency pilot sign be the transmitting terminal on each pilot sub-carrier, it is corresponding according to each pilot sub-carrier
Codeword sequence is multiplexed to the frequency pilot sign of each space layer, and the codeword sequence is multiple different codeword sequences,
The multiple different codeword sequence has identical code word and with different code word arrangements orders, the multiple different code
There is corresponding relation with each described pilot sub-carrier in word sequence；
Channel estimation value of the user equipment according to required for the frequency pilot sign obtains user data demodulation.
2. according to the method described in claim 1, it is characterised in that the multiple different codeword sequence includes：
W1=[A, B, C, D]；
W2=[B, A, D, C]；
W3=[C, D, A, B], or, [C, D, B, A]；
W4=[D, C, B, A], or, [D, C, A, B]；
Wherein, the A, B, C, D are code word, and A=W (:, 1), B=W (:, 2), C=W (:, 3), D=W (:,4)；W(:, m) table
Show the corresponding column vector of orthogonal matrix W m row, m is 1 to 4；
Correspondingly, the corresponding relation of the multiple different codeword sequence and each pilot sub-carrier is determined, is specifically included：
For pilot sub-carrier n1, using codeword sequence W1；
For pilot sub-carrier n2, using codeword sequence W2；
For pilot sub-carrier n3, using codeword sequence W3；
For pilot sub-carrier n4, using codeword sequence W4；
For pilot sub-carrier n5, using codeword sequence W1；
For pilot sub-carrier n6, using codeword sequence W2；
And be repeated in down；Wherein, the n is the positive integer more than zero.
3. according to the method described in claim 1, it is characterised in that the multiple different codeword sequence includes：
Or,Or,
Wherein, the A`, B`, C`, D` are code word, and A`=W` (1,:), B`=W` (2,:), C`=W` (3,:), D`=W`
(4,:), W` (m,:) row vector corresponding to orthogonal matrix w m rows is represented, m is 1 to 4；
Correspondingly, the corresponding relation of the multiple different codeword sequence and each pilot sub-carrier is determined, is specifically included：
For pilot sub-carrier n1, using codeword sequence W1`；
For pilot sub-carrier n2, using codeword sequence W2`；
For pilot sub-carrier n3, using codeword sequence W3`；
For pilot sub-carrier n4, using codeword sequence W4`；
For pilot sub-carrier n5, using codeword sequence W1`；
For pilot sub-carrier n6, using codeword sequence W2`；
And be repeated in down；Wherein, the n is the positive integer more than zero.
4. a kind of processing unit of frequency pilot sign, it is characterised in that including：
For the reception device for the frequency pilot sign for receiving transmitting terminal transmission；
Wherein, the frequency pilot sign be the transmitting terminal on each pilot sub-carrier, it is corresponding according to each pilot sub-carrier
Codeword sequence is multiplexed to the frequency pilot sign of each space layer, and the codeword sequence is multiple different codeword sequences,
The multiple different codeword sequence has identical code word and with different code word arrangements orders, the multiple different code
There is corresponding relation with each described pilot sub-carrier in word sequence；
The channel estimation value of channel estimation value required for for obtaining user data demodulation according to the frequency pilot sign, which is obtained, to be filled
Put.
5. device according to claim 4, it is characterised in that the multiple different codeword sequence includes：
W1=[A, B, C, D]；
W2=[B, A, D, C]；
W3=[C, D, A, B], or, [C, D, B, A]；
W4=[D, C, B, A], or, [D, C, A, B]；
Wherein, the A, B, C, D are code word, and A=W (:, 1), B=W (:, 2), C=W (:, 3), D=W (:,4)；
W(:, the corresponding column vector of orthogonal matrix W m row m) is represented, m is 1 to 4；
For pilot sub-carrier n1, using codeword sequence W1；
For pilot sub-carrier n2, using codeword sequence W2；
For pilot sub-carrier n3, using codeword sequence W3；
For pilot sub-carrier n4, using codeword sequence W4；
For pilot sub-carrier n5, using codeword sequence W1；
For pilot sub-carrier n6, using codeword sequence W2；
And be repeated in down；Wherein, the n is the positive integer more than zero.
6. device according to claim 4, it is characterised in that the multiple different codeword sequence includes：
Or,Or,
Wherein, the A`, B`, C`, D` are code word, and A`=W` (1,:), B`=W` (2,:), C`=W` (3,:), D`=W`
(4,:), W` (m,:) row vector corresponding to orthogonal matrix w m rows is represented, m is 1 to 4；
Correspondingly,
For pilot sub-carrier n1, using codeword sequence W1`；
For pilot sub-carrier n2, using codeword sequence W2`；
For pilot sub-carrier n3, using codeword sequence W3`；
For pilot sub-carrier n4, using codeword sequence W4`；
For pilot sub-carrier n5, using codeword sequence W1`；
For pilot sub-carrier n6, using codeword sequence W2`；
And be repeated in down；Wherein, the n is the positive integer more than zero.
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