CN106452707A - Pilot frequency allocation method and device - Google Patents
Pilot frequency allocation method and device Download PDFInfo
- Publication number
- CN106452707A CN106452707A CN201610714711.4A CN201610714711A CN106452707A CN 106452707 A CN106452707 A CN 106452707A CN 201610714711 A CN201610714711 A CN 201610714711A CN 106452707 A CN106452707 A CN 106452707A
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- Prior art keywords
- cell
- user
- pilot frequency
- edge customer
- orthogonal
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
Abstract
The embodiment of the invention provides a pilot frequency allocation method and device, and relates to the field of communication. The pilot frequency pollution of edge users can be effectively suppressed. The method comprises the steps that the distance between a cell site and each user in the cell is acquired in each cell; center users and the edge users corresponding to different cells are determined according to the distance between the cell sites and all the users in the cells of different cells and the corresponding rated number of the edge users; and orthogonal pilot frequency sequences are allocated for all the edge users, and multiplexing pilot frequency sequences are allocated for all the center users, wherein all the pilot frequency sequences including the orthogonal pilot frequency sequences allocated for the edge users and the multiplexing pilot frequency sequences allocated for the center users in the same cell are mutually orthogonal sequences. The pilot frequency allocation method and device are suitable for the process of pilot frequency pollution suppression.
Description
【Technical field】
The present invention relates to the communications field, more particularly, to a kind of method and device of pilot tone distribution.
【Background technology】
Extensive MIMO (multiple-input multiple-output, multiple-input and multiple-output) technology can utilize phase
Same running time-frequency resource is that multi-user provides service.Because extensive mimo system user is again very many, orthogonal guide frequency quantity has
Limit, therefore can not distribute orthogonal guide frequency to for each user.Solution common at present is that in same cell, distribution is all just
Hand over pilot tone, be multiplexed these pilot tones between different districts, such pilot tone distribution can make the pilot tone between user in different districts non-
Orthogonal or identical, thus producing inter-cell pilot contamination phenomenon.
Currently in extensive MIMO pilot pollution suppression technology, pilot allocation scheme interferes less for minizone
User interfere larger user using identical pilot tone and adopt orthogonal pilot tone, thus there are the feelings of pilot pollution
Under condition, can be with the overall performance of lift system, but algorithm is complicated, needs to cooperate on a large scale between base station, need to take substantial amounts of
System resource.
【Content of the invention】
In view of this, embodiments provide a kind of pilot distribution method, can be using relatively low system resource
Under conditions of suppress edge customer pilot pollution.
On the one hand, embodiments provide a kind of pilot distribution method, including：
In each cell, obtain the distance between each user in cell base station and cell；
Specified according to the distance between cell base station in different districts and user each in cell and corresponding edge customer
Number, determines each self-corresponding central user in different districts and edge customer；
Distribute orthogonal pilot frequency sequence for all edge customers, and, distribute multiplexed pilot sequence for all central user；Its
In, the inclusion in same cell is distributed to the orthogonal pilot frequency sequence of edge customer and is distributed to the multiplexed pilot sequence of central user
In interior all pilot frequency sequences orthogonal sequence each other.
Aspect as above and arbitrary possible implementation, it is further provided a kind of implementation, described basis is not
With the distance between cell base station in cell and user each in cell and the specified number of corresponding edge customer, determine different little
The each self-corresponding central user in area and edge customer, also include：
In each cell, arranged by as far as nearly order according to the distance between cell base station and user each in cell
Sequence；
Will be forward for ranking results and meet described edge customer several users of nominal number purpose and be defined as edge customer；
Other users in addition to described edge customer are defined as central user.
Aspect as above and arbitrary possible implementation, it is further provided a kind of implementation, in described basis
The distance between cell base station and user each in cell and the specified number of corresponding edge customer in different districts, determine different
Before each self-corresponding central user of cell and edge customer, also include：
Obtain cell total quantity and orthogonal pilot frequency sequence quantity；
According to described cell total quantity and described orthogonal pilot frequency sequence quantity, determine the corresponding edge customer of each cell
Specified number；Wherein, all cell inward flange user's nominal number purpose summations are less than described orthogonal pilot frequency sequence quantity.
On the other hand, embodiments provide a kind of pilot distribution device, described device includes：
First acquisition unit, in each cell, obtaining the distance between each user in cell base station and cell；
First determining unit, for according to the distance between cell base station in different districts and user each in cell and phase
The specified number of edge customer answered, determines each self-corresponding central user in different districts and edge customer；
Allocation unit, for distributing orthogonal pilot frequency sequence for all edge customers and, multiple for all central user distribution
Use pilot frequency sequence；Wherein, the inclusion in same cell is distributed to the orthogonal pilot frequency sequence of edge customer and is distributed to central user
Multiplexed pilot sequence in interior all pilot frequency sequences orthogonal sequence each other.
Aspect as above and arbitrary possible implementation, it is further provided a kind of implementation, described first is true
Order unit includes：
Order module, in each cell, according to the distance between cell base station and each user in cell by as far as
Closely sequentially it is ranked up；
First determining module, for will be forward for ranking results and meet described edge customer several users of nominal number purpose
It is defined as edge customer；
Second determining module, for being defined as central user by the other users in addition to described edge customer.
Aspect as above and arbitrary possible implementation, it is further provided a kind of implementation, described device is also
Including：
Second acquisition unit, for obtaining cell total quantity and orthogonal pilot frequency sequence quantity；
Second determining unit, for according to described cell total quantity and described orthogonal pilot frequency sequence quantity, determining each
The specified number of the corresponding edge customer of cell；Wherein, all cell inward flange user's nominal number purpose summations be less than described just
Hand over pilot frequency sequence quantity.
Embodiments provide a kind of method and device of pilot tone distribution, according to path loss, community user is divided into
Central user group and edge customer group, the central user group multiplexed pilot of all cells, edge customer group distributes orthogonal guide frequency, this
Inventive embodiments only rely on intra-cell users and are grouped carrying out pilot tone distribution, do not need between base station extensive collaboration communication to enter
Row pilot tone suppresses, and for prior art, the system resource of use is less.
【Brief description】
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be attached to use required in embodiment
Figure be briefly described it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this area
For those of ordinary skill, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of a kind of method of pilot tone distribution that the embodiment of the present invention is provided；
Fig. 2 is the schematic flow sheet of the method for another kind of pilot tone distribution that the embodiment of the present invention is provided；
Fig. 3 is the schematic diagram of a kind of edge customer of being provided of the embodiment of the present invention and central user；
Fig. 4 is the schematic flow sheet of the method for another kind of pilot tone distribution that the embodiment of the present invention is provided；
Fig. 5 is a kind of pilot tone assigned unit composition frame chart that the embodiment of the present invention is provided；
Fig. 6 is another kind of pilot tone assigned unit composition frame chart that the embodiment of the present invention is provided；
Fig. 7 is another kind of pilot tone assigned unit composition frame chart that the embodiment of the present invention is provided.
【Specific embodiment】
In order to be better understood from technical scheme, below in conjunction with the accompanying drawings the embodiment of the present invention is retouched in detail
State.
It will be appreciated that described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of not making creative work all its
Its embodiment, broadly falls into the scope of protection of the invention.
The term using in embodiments of the present invention is the purpose only merely for description specific embodiment, and is not intended to be limiting
The present invention." a kind of ", " described " and " being somebody's turn to do " of singulative used in the embodiment of the present invention and appended claims
It is also intended to including most forms, unless context clearly shows that other implications.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation of description affiliated partner, represent
There may be three kinds of relations, for example, A and/or B, can represent：, there is A and B in individualism A simultaneously, individualism B these three
Situation.In addition, character "/" herein, typically represent forward-backward correlation to as if a kind of relation of "or".
The embodiment of the present invention provides a kind of pilot distribution method, refer to Fig. 1, its side being provided by the embodiment of the present invention
The schematic flow sheet of method, as shown in figure 1, the method comprises the following steps：
101st, in each cell, obtain the distance between each user in cell base station and cell.
Cell base station can be using the distance of architecture technical limit spacing base station and community user.
102nd, according to the distance between cell base station in different districts and user each in cell and corresponding edge customer
Specified number, determines each self-corresponding central user in different districts and edge customer.
103rd, it is that all edge customers distribute orthogonal pilot frequency sequence, and, distribute multiplexed pilot sequence for all central user
Row.
Wherein, the inclusion in same cell is distributed to the orthogonal pilot frequency sequence of edge customer and is distributed to answering of central user
With pilot frequency sequence in interior all pilot frequency sequences orthogonal sequence each other.
A kind of pilot distribution method that the embodiment of the present invention is provided, can eliminate the pilot pollution of edge customer.Prove
Process is as follows：
By dissemination channel matrix HijIt is divided into two parts,
Wherein,Represent the dissemination channel matrix of the central user of cell j to Target cell i base station,Represent cell j
Edge customer to Target cell i base station dissemination channel matrix.
Obtain Target cell i base station and receive pilot tone vectorDescribed pilot tone vector mathematics expression formula is：
Wherein, ppFor up-link transmission power, ψc(r：Kc) be all central user in cell pilot frequency sequence square
Battle array, ψejIt is the pilot frequency sequence matrix of all edge customers in cell,Additive white Gaussian noise for up-link.
Calculate the channel matrix of edge customer according to least square methodThe mathematic(al) representation of described channel matrix is：
Wherein,Representing matrix ψeiConjugate transposition.
It can be deduced that the channel matrix of edge customer is relevant with the cell base station being located, with other from above-mentioned expression formula
Cell base station is unrelated.Because, in a cell, the pilot frequency sequence of all of community user is orthogonal, and therefore, edge customer is not deposited
In pilot pollution.
Embodiments provide a kind of method of pilot tone distribution, community user is divided into by center according to path loss and uses
Family group and edge customer group, the central user group multiplexed pilot of all cells, edge customer group distributes orthogonal guide frequency, and the present invention is real
Apply example to only rely on intra-cell users and be grouped to carry out pilot tone distribution, do not need cooperation between base stations to communicate to carry out pilot tone suppression,
For prior art, the system resource of use is less.
Further, in the another embodiment of the embodiment of the present invention, there is provided determine that different districts are each self-corresponding
Central user and the method for edge customer, based on this purpose, there is provided corresponding method flow, the method flow process as shown in Fig. 2
Specific as follows：
201st, in each cell, carried out by as far as nearly order according to the distance between cell base station and user each in cell
Sequence.
Communication performance due to user and the distance dependent system apart from base station, use apart from the more remote current area of cell base station
The path loss at family is typically bigger.Arranged by as far as nearly order according to the distance between cell base station and user each in cell
Sequence, can generally determine the not good user of communication performance.
202nd, by forward for ranking results and meet described edge customer several users of nominal number purpose be defined as edge use
Family.
203rd, the other users in addition to described edge customer are defined as central user.
All users of one cell are divided into central user group 31 and edge customer group 32, schematic diagram is as shown in Figure 3.
Further it is thus necessary to determine that the specified number of edge customer, in the another embodiment of the embodiment of the present invention, provide
Corresponding method flow, before need to being implemented in step 102, the method flow process is as shown in figure 4, specific as follows：
401st, cell total quantity and orthogonal pilot frequency sequence quantity are obtained.
402nd, according to described cell total quantity and described orthogonal pilot frequency sequence quantity, determine the corresponding edge of each cell
The specified number of user.
Wherein, all cell inward flange user's nominal number purpose summations are less than described orthogonal pilot frequency sequence quantity, this kind of
The purpose of distribution method is to allow each edge customer in different districts all can be using different orthogonal pilot frequency sequences.This kind of
In the case of, the summation (the orthogonal guide frequency quantity that i.e. edge customer is used) of each cell orthogonal guide frequency quantity to be dispensed can not
Enough exceed described orthogonal pilot frequency sequence quantity.And the pilot frequency sequence that central user is used then can be multiplexed its institute side in the cell
The untapped pilot frequency sequence of edge user.
The embodiment of the present invention additionally provides a kind of pilot tone assigned unit, can be used for realizing aforementioned approaches method flow process, its group
Become as shown in figure 5, including：
First acquisition unit 51, in each cell, obtaining the distance between each user in cell base station and cell.
First determining unit 52, for according to the distance between each user in cell base station in different districts and cell and
The corresponding specified number of edge customer, determines each self-corresponding central user in different districts and edge customer.
Allocation unit 53, for distributing orthogonal pilot frequency sequence for all edge customers, and, distributes for all central user
Multiplexed pilot sequence；Wherein, the orthogonal pilot frequency sequence of edge customer is distributed in the inclusion in same cell and center of distributing to is used
The multiplexed pilot sequence at family is in interior all pilot frequency sequences orthogonal sequence each other.
Optionally, as shown in fig. 6, described first determining unit 52 includes：
Order module 521, in each cell, according to the distance between cell base station and user each in cell by remote
To being closely sequentially ranked up.
First determining module 522, for by forward for ranking results and meet described edge customer nominal number purpose several
User is defined as edge customer.
Second determining module 523, for being defined as central user by the other users in addition to described edge customer.
Optionally, as shown in fig. 7, described device also includes：
Second acquisition unit 71, for obtaining cell total quantity and orthogonal pilot frequency sequence quantity.
Second determining unit 72, every for according to described cell total quantity and described orthogonal pilot frequency sequence quantity, determining
The specified number of the corresponding edge customer of individual cell.
Wherein, all cell inward flange user's nominal number purpose summations are less than described orthogonal pilot frequency sequence quantity, this kind of
The purpose of distribution method is to allow each edge customer in different districts all can be using different orthogonal pilot frequency sequences.This kind of
In the case of, the summation (the orthogonal guide frequency quantity that i.e. edge customer is used) of each cell orthogonal guide frequency quantity to be dispensed can not
Enough exceed described orthogonal pilot frequency sequence quantity.And the pilot frequency sequence that central user is used then can be multiplexed its institute side in the cell
The untapped pilot frequency sequence of edge user.
Embodiments provide a kind of pilot tone assigned unit, community user is divided into by center according to path loss and uses
Family group and edge customer group, the central user group multiplexed pilot of all cells, edge customer group distributes orthogonal guide frequency, and the present invention is real
Apply example and only rely on intra-cell users and be grouped carrying out pilot tone distribution, do not need between base station extensive collaboration communication to carry out pilot tone
Suppression, for prior art, the system resource of use is less.
Those skilled in the art can be understood that, for convenience and simplicity of description, the system of foregoing description,
Device and the specific work process of unit, may be referred to the corresponding process in preceding method embodiment, will not be described here.
It should be understood that disclosed system in several embodiments provided by the present invention, apparatus and method are permissible
Realize by another way.For example, device embodiment described above is only schematically, for example, described unit
Divide, only a kind of division of logic function, actual can have other dividing mode when realizing, for example, multiple units or group
Part can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not execute.Another, shown
Or the coupling each other that discusses or direct-coupling or communication connection can be by some interfaces, device or unit indirect
Coupling or communication connection, can be electrical, mechanical or other forms.
The described unit illustrating as separating component can be or may not be physically separate, show as unit
The part showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.The mesh to realize this embodiment scheme for some or all of unit therein can be selected according to the actual needs
's.
In addition, can be integrated in a processing unit in each functional unit in each embodiment of the present invention it is also possible to
It is that unit is individually physically present it is also possible to two or more units are integrated in a unit.Above-mentioned integrated list
Unit both can be to be realized in the form of hardware, it would however also be possible to employ the form that hardware adds SFU software functional unit is realized.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in an embodied on computer readable and deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions with so that a computer
Device (can be personal computer, server, or network equipment etc.) or processor (Processor) execution the present invention each
The part steps of embodiment methods described.And aforesaid storage medium includes：USB flash disk, portable hard drive, read-only storage (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. various
Can be with the medium of store program codes.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement done etc., should be included within the scope of protection of the invention.
Claims (6)
1. a kind of method of pilot tone distribution is it is characterised in that methods described includes：
In each cell, obtain the distance between each user in cell base station and cell；
According to the distance between cell base station in different districts and user each in cell and the specified number of corresponding edge customer,
Determine each self-corresponding central user in different districts and edge customer；
Distribute orthogonal pilot frequency sequence for all edge customers, and, distribute multiplexed pilot sequence for all central user；Wherein,
The orthogonal pilot frequency sequence of edge customer is distributed in inclusion in same cell and the multiplexed pilot sequence distributing to central user exists
Interior all pilot frequency sequences orthogonal sequence each other.
2. method according to claim 1 it is characterised in that described according to each in cell base station in different districts and cell
The distance between user and the corresponding specified number of edge customer, determine each self-corresponding central user in different districts and edge
User includes：
In each cell, it is ranked up by as far as nearly order according to the distance between cell base station and user each in cell；
Will be forward for ranking results and meet described edge customer several users of nominal number purpose and be defined as edge customer；
Other users in addition to described edge customer are defined as central user.
3. method according to claim 1 and 2 it is characterised in that described according to cell base station in different districts with little
In area, the distance between each user and the corresponding specified number of edge customer, determine each self-corresponding central user in different districts
Before edge customer, also include：
Obtain cell total quantity and orthogonal pilot frequency sequence quantity；
According to described cell total quantity and described orthogonal pilot frequency sequence quantity, determine that the corresponding edge customer of each cell is specified
Number；
Wherein, all cell inward flange user's nominal number purpose summations are less than described orthogonal pilot frequency sequence quantity.
4. a kind of pilot tone assigned unit is it is characterised in that described device includes：
First acquisition unit, in each cell, obtaining the distance between each user in cell base station and cell；
First determining unit, for according to the distance between cell base station in different districts and user each in cell and corresponding
The specified number of edge customer, determines each self-corresponding central user in different districts and edge customer；
Allocation unit, for distributing orthogonal pilot frequency sequence for all edge customers, and, leads for all central user distribution multiplexings
Frequency sequence；Wherein, the inclusion in same cell is distributed to the orthogonal pilot frequency sequence of edge customer and is distributed to answering of central user
With pilot frequency sequence in interior all pilot frequency sequences orthogonal sequence each other.
5. device according to claim 4 is it is characterised in that described first determining unit includes：
Order module, in each cell, according to the distance between cell base station and user each in cell by as far as closely suitable
Sequence is ranked up；
First determining module, for will be forward for ranking results and meet described edge customer several users of nominal number purpose and determine
For edge customer；
Second determining module, for being defined as central user by the other users in addition to described edge customer.
6. the device according to claim 4 or 5 is it is characterised in that described device also includes：
Second acquisition unit, for obtaining cell total quantity and orthogonal pilot frequency sequence quantity；
Second determining unit, for according to described cell total quantity and described orthogonal pilot frequency sequence quantity, determining each cell
The specified number of corresponding edge customer；Wherein, all cell inward flange user's nominal number purpose summations are less than described orthogonal lead
Frequency sequence quantity.
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| CN201610714711.4A CN106452707A (en) | 2016-08-24 | 2016-08-24 | Pilot frequency allocation method and device |
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|---|---|---|---|
| CN201610714711.4A CN106452707A (en) | 2016-08-24 | 2016-08-24 | Pilot frequency allocation method and device |
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| CN107888367A (en) * | 2017-11-24 | 2018-04-06 | 重庆邮电大学 | Dynamic pilot allocation method based on user's classification in extensive mimo system |
| CN110505702A (en) * | 2019-09-29 | 2019-11-26 | 重庆大学 | A kind of pilot distribution method based on subscriber signal angle of arrival |
| CN110958102A (en) * | 2019-12-03 | 2020-04-03 | 中南大学 | Pilot pollution suppression method based on pilot distribution and power control joint optimization |
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| CN110505702A (en) * | 2019-09-29 | 2019-11-26 | 重庆大学 | A kind of pilot distribution method based on subscriber signal angle of arrival |
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| CN110958102A (en) * | 2019-12-03 | 2020-04-03 | 中南大学 | Pilot pollution suppression method based on pilot distribution and power control joint optimization |
| CN110958102B (en) * | 2019-12-03 | 2020-11-13 | 中南大学 | Pilot pollution suppression method based on pilot distribution and power control joint optimization |
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Application publication date: 20170222 |