CN105049098B - The portion of pilot multiplexing method of pilot pollution is overcome in extensive mimo system - Google Patents
The portion of pilot multiplexing method of pilot pollution is overcome in extensive mimo system Download PDFInfo
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- CN105049098B CN105049098B CN201510330115.1A CN201510330115A CN105049098B CN 105049098 B CN105049098 B CN 105049098B CN 201510330115 A CN201510330115 A CN 201510330115A CN 105049098 B CN105049098 B CN 105049098B
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- 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
- H04B7/0417—Feedback systems
- H04B7/0421—Feedback systems utilizing implicit feedback, e.g. steered pilot signals
-
- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
Abstract
The invention discloses a kind of portion of pilot multiplexing methods overcoming pilot pollution in extensive mimo system, include the following steps：(1) training stage, the size that user judges itself to be disturbed according to the signal received, and these information are transmitted to base station；(2) base station determines a Signal to Interference plus Noise Ratio thresholding, and user is divided into interference user (edge customer) and weak jamming user (central user) according to the information that user uploads according to the difference of intra-cell users number；(3) the weak jamming user (central user) of different community is given to distribute same set of pilot tone, neighboring community's interference user (edge customer) distributes different pilot tones.The central user of different community of the present invention is multiplexed same set of pilot tone, them can be allowed to be multiplexed same pilot tone to improve the utilization rate of pilot tone；The edge customer of neighboring community is using different pilot tones to reduce interference；To reduce the influence of pilot pollution and improve the utilization rate of pilot tone.
Description
【Technical field】
The invention belongs to field of communication technology, it is related to a kind of part overcoming pilot pollution in extensive mimo system and leads
Frequency multiplexing method.
【Background technology】
In usable spectrum resource increasingly deficient today, opens up new spatial domain resource and have become and promote system capacity and performance
One of effective means.Therefore, how more fully to meet growing communication requirement using spatial domain resource always is all nothing
The hot spot of line communication technology area research.
In recent years, with the progress of electronic device and system integration technology, large-scale aerial array is used in base station end
Possibility is gone completely into, correspondingly extensive MIMO technology also just meets the tendency of life.Existing research has shown that：When base station end configuration
When antenna number tends to be infinite, the corresponding reception channel vector of each user will tend to be orthogonal, then just using Wave beam forming skill
Art reduces inter-cell interference, and significantly increases the availability of frequency spectrum and energy efficiency of system.Due to these significant advantages,
Extensive MIMO technology has been subjected to the extensive concern of industry and academia, and is seen as realizing following high energy efficiency green broadband
One of key technology of mobile communication system.
Before although extensive MIMO technology illustrates a very fine application with its significant performance advantage to everybody
Scape, but these above-mentioned performance advantages must be known to all channel informations under the premise of can obtain because wave is being done in base station
Beam formed or when signal detection must be known by each user to base station channel information.If base station when doing Channel Detection,
Different pilot tones that the user of neighboring community uses, then, base station by detection by be these users combined channel, to
Signal can be sent together to these users, cause pilot pollution when downlink.
【Invention content】
The purpose of the present invention is to provide a kind of portion of pilot overcoming pilot pollution in extensive mimo system to be multiplexed
Method, by distributing different pilot tones to interference user to reduce the influence of pilot pollution.
In order to achieve the above objectives, the present invention uses following technical scheme：
A kind of portion of pilot multiplexing method overcoming pilot pollution in extensive mimo system, includes the following steps：
(1), the training stage：The size that user judges itself to be disturbed according to the signal received, and by these information
It is transmitted to base station；
(2), base station determines a Signal to Interference plus Noise Ratio thresholding according to the difference of intra-cell users number, makes an uproar the letter of user is dry
Than being converted to user distance this cell base station distance riFunction, pass through a distance threshold RthBy user be divided into central user and
Edge customer；
(3), same set of pilot tone is distributed to the central user of different community, the edge customer of neighboring community distributes different lead
Frequently.
The step (2) the specific steps are：
After the base station of this cell receives the information of reporting of user, Signal to Interference plus Noise Ratio door is determined according to the quantity information of user
Limit；And user is divided by interference user and weak jamming user according to Signal to Interference plus Noise Ratio；The Signal to Interference plus Noise Ratio of user is expressed as：
Wherein, 2RC-riUser is indicated with a distance from nearest interfered cell base station, riFor user distance this cell base station
Distance, for central user, RC=R is radius of society, for edge customer,ρBSIndicate cell density；For
Central user：ρBS=π R2, for edge customer：α is path-loss factor；The Signal to Interference plus Noise Ratio of user is converted
For user distance this cell base station distance riFunction, pass through a distance threshold RthUser is divided into central user and edge is used
Family：
Mc={ i:ri≤Rth},Me={ i:ri>Rth}
Wherein, i indicates user's serial number, McAnd MeThe set of central user and edge customer is indicated respectively；
The average size that Cell Center User and edge customer is calculated is respectively：
Δ f indicates the bandwidth of system, R0Indicate the minimum range of user distance base station, SIRCAnd SIREUser is indicated respectively
Centered on user and Signal to Interference plus Noise Ratio when edge customer；
Pilot tone is allocated according to the area at center of housing estate and edge, and center pilot number and edge pilot number are respectively：
Nc=N-3NE
WhereinIt indicates to rounding under x；N is total number of pilots；
The total capacity c of cell is ultimately expressed as：
Wherein, M is the total number of users in cell；The possibility of k element is selected in expression from M element；
By obtaining best division thresholding R to cell total capacity maximizingth。
The step (3) the specific steps are：
Optimum thresholding R obtained by calculationth, user is divided into central user and edge customer, in different community
Heart user distributes same set of pilot tone, and the edge customer of neighboring community distributes different pilot tones.
The present invention is in extensive mimo system, and different user can be caused mutually dry using identical pilot tone in neighboring community
It disturbs.In order to mitigate this interference, cell base station distributes different pilot tones to the user of different location, makes the strong jamming of neighboring community
User is using different pilot tones to reduce interference.
Compared with the existing technology, the invention has the advantages that：
The present invention proposes a kind of using portion of pilot multiplexing for the pilot pollution problem present in extensive mimo system
The pilot resource distribution method of technology improves system performance to reduce pilot pollution；The method of the present invention will according to the position of user
User is divided into central user and edge customer；For interfering weaker central user, the central user of different community between each other
It is multiplexed same set of pilot tone, them can be allowed to be multiplexed same pilot tone to improve the utilization rate of pilot tone；For interfere between each other compared with
The edge customer of strong edge customer, neighboring community is interfered using different pilot tones with reducing；To reduce the shadow of pilot pollution
Ring and improve the utilization rate of pilot tone.Using the cell optimum thresholding obtained by computer sim- ulation come divide user can be maximized
The capacity of raising system.
【Description of the drawings】
Fig. 1 is the Scene case figure that the method for the present invention is applied；
Fig. 2 gives function and realizes module frame chart；
Fig. 3 gives the network structure of cell；
Fig. 4 is the relational graph divided by the system that Computer Simulation obtains between thresholding and cell total capacity；
Fig. 5 gives is 50 in pilot number, the cumulative distribution function of cell capacity under Different Strategies when number of users is 36
Curve.
【Specific implementation mode】
The present invention is described in further detail below in conjunction with the accompanying drawings：
In extensive MIMO communication system, since total number of pilots is limited, difference can not be all distributed to all users
Orthogonal guide frequency, so being existing always the problem of pilot pollution.In order to reduce pilot pollution, the present invention is to dry between each other
It disturbs stronger user and distributes different pilot tones, interfere with each other weaker user and be then multiplexed same pilot.When dividing user, need to set
A fixed Signal to Interference plus Noise Ratio thresholding, and central user and edge customer are divided into according to the Signal to Interference plus Noise Ratio of user itself, wherein different
The central user of cell is multiplexed same pilot, and the edge customer of neighboring community uses different pilot tones, as shown in Figure 1.
By this pilot tone method of salary distribution, it will be seen that the central user of different community is apart from each other, use is identical
Pilot tone can't allow and generate strong jamming between each other, and at a distance of relatively close between the edge customer of neighboring community, by giving them
Distribute the influence that different pilot tones can effectively reduce pilot pollution.
A kind of portion of pilot multiplexing method overcoming pilot pollution in extensive mimo system of the present invention, including following step
Suddenly：
(1), the training stage, the size that user judges itself to be disturbed according to the signal received, and by these information
It is transmitted to base station；
(2), base station determines a Signal to Interference plus Noise Ratio thresholding according to the difference of intra-cell users number, makes an uproar the letter of user is dry
Than being converted to user distance this cell base station distance riFunction, pass through a distance threshold RthUser is divided into interference user
(edge customer) and weak jamming user (central user)；
(3), same set of pilot tone, neighboring community's interference user are distributed to the weak jamming user (central user) of different community
(edge customer) distributes different pilot tones.As shown in Figure 2.
Step (2) the specific steps are：After the base station of this cell receives the information of reporting of user, according to the quantity of user
Information determines Signal to Interference plus Noise Ratio thresholding.And user is divided by interference user according to thresholding and the Signal to Interference plus Noise Ratio of user and (is used at edge
Family) and weak jamming user (central user).Assuming that the number of antennas of base station tends to be infinite more, then the Signal to Interference plus Noise Ratio of user can be with
It is expressed as：
Wherein, 2RC-riUser is indicated with a distance from nearest interfered cell base station, riFor user distance this cell base station
Distance, for central user, RC=R is radius of society, for edge customer,ρBSIndicate cell density, for
Central user：ρBS=π R2, for edge customer：α is path-loss factor.It can be with by a series of approximation
The Signal to Interference plus Noise Ratio of user is converted into user distance this cell base station distance riFunction, therefore a distance threshold can be passed through
RthUser is divided into central user and edge customer：
Mc={ i:ri≤Rth, Me={ i:ri>Rth}
McAnd MeIndicate that the set of central user and edge customer, i indicate user's serial number respectively.
The average size that Cell Center User and edge customer can be calculated is respectively：
Δ f indicates the bandwidth of system, R0Indicate the minimum range of user distance base station, SIRCAnd SIREUser is indicated respectively
Centered on user and Signal to Interference plus Noise Ratio when edge customer.
Assuming that total number of pilots is N, user is uniformly distributed in cell, and pilot tone is come also according to the area at center of housing estate and edge
It is allocated, then center pilot number and edge pilot number are respectively：
Nc=N-3NE
WhereinIt indicates to rounding under x.
Thus, it is supposed that the total number of users in cell is M, then the total capacity of cell may finally be expressed as：
WhereinThe possibility of k element is selected in expression from M element.
By the way that best division thresholding R can be obtained to cell total capacity maximizingth。
User in cell is divided into central user and edge customer by step (3) according to optimum thresholding.Please refer to Fig. 3 institutes
Show, by taking No. 0 cell as an example, central user uses P0Representative pilot set, edge customer use P1Representative pilot set
It closes.Other cells use identical strategy, the central user of all cells to be all multiplexed P0Representative pilot set, neighboring community
Edge customer use different pilot tones, wherein 0,8,10,12,14,16, No. 18 cell uses P1Representative pilot set,
No. 2,4,6,7,11,15 cells use P2Representative pilot set, other cells use P3Representative pilot set.Due to
The central user of different community is apart from each other, so too big interference can't be caused by distributing identical a set of pilot tone to them；
And at a distance of relatively close between the edge customer of neighboring community, therefore to they distribute different pilot tones effectively can reduce them it
Between interference.
Fig. 4 gives the relationship between system division thresholding and cell total capacity by Computer Simulation, according to number of users
Difference provide different optimum thresholdings and can maximize the capacity of system.
Fig. 5 gives is 50 in pilot number, the cumulative distribution function of cell capacity under Different Strategies when number of users is 36
Curve, it can be seen that use the overall performance of portion of pilot multiplexing technology energy lifting system.
Claims (2)
1. overcoming the portion of pilot multiplexing method of pilot pollution in extensive mimo system, which is characterized in that include the following steps：
(1), the training stage：The size that user judges itself to be disturbed according to the signal received, and these information are transmitted to
Base station；
(2), base station determines a Signal to Interference plus Noise Ratio thresholding according to the difference of intra-cell users number, and the Signal to Interference plus Noise Ratio of user is turned
It is changed to user distance this cell base station distance riFunction, pass through a distance threshold RthUser is divided into central user and edge
User；
(3), same set of pilot tone is distributed to the central user of different community, the edge customer of neighboring community distributes different pilot tones；
The step (2) the specific steps are：
After the base station of this cell receives the information of reporting of user, Signal to Interference plus Noise Ratio thresholding is determined according to the quantity information of user；And
User is divided into interference user and weak jamming user according to Signal to Interference plus Noise Ratio；The Signal to Interference plus Noise Ratio of user is expressed as：
Wherein, 2RC-riUser is indicated with a distance from nearest interfered cell base station, riFor user distance this cell base station away from
From for central user, RC=R is radius of society, for edge customer,ρBSIndicate cell density；For in
Heart user：ρBS=π R2, for edge customer：α is path-loss factor；The Signal to Interference plus Noise Ratio of user is converted to
User distance this cell base station distance riFunction, pass through a distance threshold RthUser is divided into central user and edge is used
Family：
Mc={ i:ri≤Rth, Me={ i:ri>Rth}
McAnd MeThe set of central user and edge customer is indicated respectively；I indicates user's serial number；
The average size that Cell Center User and edge customer is calculated is respectively：
Δ f indicates the bandwidth of system, R in formula0Indicate the minimum range of user distance base station, SIRCAnd SIREUser is indicated respectively
Centered on user and Signal to Interference plus Noise Ratio when edge customer；
Pilot tone is allocated according to the area at center of housing estate and edge, and center pilot number and edge pilot number are respectively：
Nc=N-3NE
WhereinIt indicates to rounding under x；N is total number of pilots；
The total capacity c of cell is ultimately expressed as：
Wherein, M is the total number of users in cell；The possibility of k element is selected in expression from M element；
By obtaining best division thresholding R to cell total capacity maximizingth。
2. a kind of portion of pilot multiplexing method overcoming pilot pollution in extensive mimo system as described in claim 1,
Be characterized in that, the step (3) the specific steps are：
Optimum thresholding R obtained by calculationth, user is divided into central user and edge customer, is used to the center of different community
Same set of pilot tone is distributed at family, and the edge customer of neighboring community distributes different pilot tones.
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| WO2017084703A1 (en) * | 2015-11-18 | 2017-05-26 | Huawei Technologies Co., Ltd. | Fractional pilot reuse in multi-user mimo |
| CN105681009B (en) * | 2015-12-29 | 2018-10-02 | 厦门大学 | Pilot tone optimization distribution joint method for precoding for multi-user's multiple-input and multiple-output |
| CN105634709B (en) * | 2016-01-19 | 2018-09-04 | 北京联合大学 | A kind of pilot distribution method |
| CN105763309B (en) * | 2016-03-16 | 2019-05-31 | 南京邮电大学 | Pilot pollution mitigates method in the extensive mimo system of chain network |
| CN105656614B (en) * | 2016-03-30 | 2019-01-25 | 北京邮电大学 | Pilot frequency sequence distribution method and device based on extensive multi-input multi-output system |
| CN106059728B (en) * | 2016-05-05 | 2019-03-01 | 西安交通大学 | A kind of pilot design method based on phase shift in extensive mimo system |
| CN105978836B (en) * | 2016-05-06 | 2019-04-02 | 华东交通大学 | Multi-district pilots abatement of pollution method under extensive mimo system |
| CN106059734B (en) * | 2016-05-30 | 2019-02-26 | 西安科技大学 | Massive mimo system pilot distribution method based on edge customer interference metric values |
| WO2018035769A1 (en) * | 2016-08-24 | 2018-03-01 | 深圳天珑无线科技有限公司 | Pilot allocation method and device |
| CN106452707A (en) * | 2016-08-24 | 2017-02-22 | 重庆大学 | Pilot frequency allocation method and device |
| CN106452714B (en) * | 2016-11-09 | 2019-04-05 | 重庆大学 | A kind of pilot distribution method of the extensive mimo system of multiple cell multi-user |
| CN108322240B (en) * | 2018-01-04 | 2021-10-01 | 南方科技大学 | Soft frequency division multiplexing method and device, large-scale multi-antenna system and storage medium |
| CN108923903B (en) * | 2018-06-26 | 2020-06-05 | 北京邮电大学 | Pilot frequency distribution method and system for multi-antenna system and electronic equipment |
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| US8891647B2 (en) * | 2009-10-30 | 2014-11-18 | Futurewei Technologies, Inc. | System and method for user specific antenna down tilt in wireless cellular networks |
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