CN106788933A - A kind of pilot distribution method for extensive mimo system - Google Patents
A kind of pilot distribution method for extensive mimo system Download PDFInfo
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- CN106788933A CN106788933A CN201611096661.4A CN201611096661A CN106788933A CN 106788933 A CN106788933 A CN 106788933A CN 201611096661 A CN201611096661 A CN 201611096661A CN 106788933 A CN106788933 A CN 106788933A
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- user
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- coordinate system
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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
-
- 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
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
Abstract
The invention belongs to communication technical field, and in particular to a kind of pilot distribution method for extensive mimo system.The method of the present invention mainly includes：Polar coordinate system is set up by limit of base station；Customer position information is converted into the polar coordinates under the coordinate system；Polar coordinates information according to obtaining is ranked up to the user in cell；It is that user distributes pilot tone according to ranking results.Beneficial effects of the present invention are, the present invention can effectively reduce the possibility of hypotelorism between the user for being multiplexed same pilot sequence, so as to reach reduce pilot pollution, raising system up to and speed purpose；By the orderly distribution to pilot tone, the pilot pollution intensity that different user is subject to can be prevented effectively from and there is a problem of bigger difference, improve the fairness of system；Compared with the method for finding optimal pilot allocative decision by the method such as enumerating, present invention utilizes the customer position information for being easier to obtain, it is to avoid complicated simulation trial and multi-cell cooperating, with relatively low complexity.
Description
Technical field
The invention belongs to communication technical field, and in particular to a kind of pilot distribution method for extensive mimo system.
Background technology
With developing rapidly for mobile Internet, user rapidly rises to the demand of high-speed data service, and current is wireless
Communication network is just subject huge pressure.In the case where frequency spectrum resource is extremely limited, extensive MIMO technology is by higher
Spectrum efficiency it is of great interest.By being equipped with a large amount of antennas in cell base station, extensive MIMO technology can be big
Width improves the quality of communication link, and substantially reduces the influence of the interference such as noise.
In multi-user MIMO system, base station needs to obtain accurate channel condition information (CSI) to be come to different user
Signal is separated.Under time division duplex (TDD) pattern, up training is completed with data transfer within same coherence time.
Therefore, using the reciprocity of channel, in the ascending pilot frequency training stage, base station can carry out letter by the pilot signal for receiving
Estimate to obtain corresponding CSI in road.
With being on the increase for user equipment, the quantity of orthogonal pilot frequency sequence will no longer be able to meet communication requirement, part
User can only be multiplexed identical pilot frequency sequence and thus produce the problem of pilot pollution.Pilot pollution will have a strong impact on channel estimation
Accuracy and substantially reduce system performance.In the extensive mimo system of multiple cell, it will usually use same community user
The pilot frequency sequence for using is mutually orthogonal, and different districts are multiplexed the pilot tone method of salary distribution of same set of orthogonal pilot frequency sequence.
In conventional pilot allocation scheme, base station is randomly assigned to the pilot tone that intra-cell users are used.The program
Complexity is relatively low, it is easy to operate.However, random pilot tone distribution may result in the uneven problem of pilot tone distribution, in certain user
While hardly interference by pilot pollution, certain customers probably due to the hypotelorism of pilot frequency multiplexing and produce serious pilot tone
Pollution, while systematic function is reduced, has also had a strong impact on the fairness of system.For this problem, it is thus proposed that
Multiple co-operating methods of cell, by cooperating between neighbor cell, find out optimal pilot tone assembled scheme, in the hope of
Pilot pollution is minimized.The program can minimize pilot pollution in theory, but need complicated base station collaboration and higher
Computation complexity.
Result of study shows, signal intensity can with the increase of transmission range fast-fading.Generally, it is multiplexed same
Distance is more remote between the user of one pilot frequency sequence, and the intensity of pilot pollution is lower.Therefore, customer position information was distributed in pilot tone
There is important value in journey.In addition, under existing ripe technical conditions, such as global positioning system (GPS), customer location
Information can be readily available.Based on above-mentioned background, the present invention is for the purpose of reducing pilot pollution, it is proposed that one is based on user
The pilot allocation scheme of positional information.
The content of the invention
Above-mentioned in order to solve the problems, such as, the present invention proposes a kind of extensive mimo system based on customer position information and leads
Frequency allocative decision：Increased and the characteristic of fast-fading with distance in transmitting procedure based on signal, the program is by pilot tone
Effectively distribution, in the case where system complexity seriously will not be increased so that the distance between the user of multiplexing same pilot sequence
It is remote as far as possible, so as to reduce pilot pollution, reach the purpose for improving systematic function.
The technical scheme is that：
A kind of pilot distribution method for extensive mimo system, it is characterised in that comprise the following steps：
A. polar coordinate system is set up：With base station location as limit, specific direction is pole axis, sets up polar coordinate system, different districts
Under polar coordinate system there is identical pole axis direction；
B. user's polar coordinates are obtained：According to the position relationship between base station and user, the positional information of user is converted to
Polar coordinates under the cell polar coordinate system of place, each polar coordinates include polar diameter r and polar angle θ, wherein
It is constant, and
C. all users in cell are ranked up：It is useful to institute according to the size of polar angle θ in the coordinate information for obtaining
Family is ranked up, and the rule that sequence is used is ascending order or descending；
D. for user distributes pilot tone：Assuming that pilot length is N, then after using the common N number of consecution natural numbers of 1~N for sequence
Customs Assigned Number；OrderWhereinTo round symbol downwards, then number since γ, after reaching N,
Continue from 1 again, untill γ -1；Numbering according to user is followed successively by user's distribution pilot tone.
Beneficial effects of the present invention are that the present invention can effectively reduce distance mistake between the user for being multiplexed same pilot sequence
Near possibility, reachable and speed the purpose of pilot pollution, raising system is reduced so as to reach；By dividing in order to pilot tone
Match somebody with somebody, the pilot pollution intensity that different user is subject to can be prevented effectively from and there is a problem of bigger difference, improve the justice of system
Property；Compared with the method for finding optimal pilot allocative decision by the method such as enumerating, present invention utilizes the user for being easier to obtain
Positional information, it is to avoid complicated simulation trial and multi-cell cooperating, with relatively low complexity.
Brief description of the drawings
Fig. 1 is extensive MIMO multiple cells multi-user TDD system illustraton of model, wherein, each cell base station is by six groups of orientations
Aerial array is constituted；
Fig. 2 is pilot tone allocation process diagram；
Fig. 3 is pilot allocation scheme schematic diagram of the invention；
Fig. 4 is the schematic diagram divided to cell according to directional antenna array.
Specific embodiment
Below in conjunction with the accompanying drawings, technical scheme is described in detail：
As shown in figure 1, so that extensive mimo system is made up of 7 cells as an example, the present invention is described in detail, each
Cell includes 16 single-antenna subscribers and an extensive antenna base station.Base station is by 6 directional aerials for assembling standby 128 antennas
Array is constituted, and centered on base station, is covered each by the sector region that six angles are.Communication process uses tdd mode.It is assumed that in
Heart cell is Target cell, and remaining cell is interfered cell.As shown in Fig. 2 pilot allocation scheme of the present invention include with
Lower specific steps：
Step 1, obtains customer position information
The positional information of user can utilize existing ripe technology (e.g., GPS, Beidou satellite navigation system etc.) to obtain.
Step 2, sets up polar coordinate system
With base station as limit, a certain specific direction sets up polar coordinate system for pole axis.Wherein, pole axis direction can be according to reality
Needs are specified, but all cells should select same direction as pole axis direction.In Fig. 3, the pole axis direction of all cells
It is due east direction.
Step 3, polar coordinates are converted to by customer position information
Customer position information is converted into the coordinate (r, θ) under the polar coordinate system set up in step 2, wherein, r is polar diameter, θ
It is polar angle, andWherein,It is constant, andMinimum value for setting θ.In Fig. 3,
That is-π≤θ<π.
Step 4, sequence
Size according to user θ carries out ascending order or descending sort to user.Ascending sort is employed in Fig. 3.
Step 5, numbers naturally
It is assumed that pilot length is 16, i.e., at most there was only 16 mutually orthogonal pilot frequency sequences.Therefore, Customs Assigned Number is followed successively by
1~16 totally 16 consecution natural numbers.User after sequence is numbered generally following two modes：If the 1st, all cells
All set identicalValue, i.e. θ has identical span, then Customs Assigned Number since 1, until 16 end；2nd, it is false
As different districts set according to actual conditions it is differentValue, orderWhereinTo take downwards
Integral symbol, then number since γ, after reaching 16, then continues from 1, untill γ -1.As shown in figure 4, in same orientation day
In the coverage of linear array, numbering identical region lie farthest away, mutual interference is also therefore most weak.Above two is numbered
The purpose of mode is provided to make the user for having identical numbering in different districts be in as far as possible in the region of same numbering.Figure
The first numbering is employed in 3.
Step 6, pilot tone distribution
Each Customs Assigned Number corresponds to an orthogonal pilot frequency sequence respectively, and user's distribution pilot tone is followed successively by according to numbering.Lead
Frequency allocation result is as shown in Figure 3.
Claims (1)
1. a kind of pilot distribution method for extensive mimo system, it is characterised in that comprise the following steps：
A. polar coordinate system is set up：With base station location as limit, the polar coordinate system set up under polar coordinate system, different districts has identical
Pole axis direction；
B. user's polar coordinates are obtained：According to the position relationship between base station and user, where the positional information of user is converted to
Polar coordinates under cell polar coordinate system, each polar coordinates include polar diameter r and polar angle θ, wherein It is constant,
And
C. the user in cell is ranked up：It is useful to the institute in cell according to the size of polar angle θ in the coordinate information for obtaining
Family is ranked up, and the rule that sequence is used is ascending order or descending；
D. for user distributes pilot tone：Assuming that pilot length is N, then N number of consecution natural number is the user after sequence altogether to use 1~N
Numbering；OrderWhereinTo round symbol downwards, then number since γ, after reaching N, then from 1
Continue, untill γ -1；Numbering according to user is followed successively by user's distribution pilot tone.
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| CN201611096661.4A CN106788933B (en) | 2016-12-02 | 2016-12-02 | A kind of pilot distribution method for extensive mimo system |
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| CN201611096661.4A CN106788933B (en) | 2016-12-02 | 2016-12-02 | A kind of pilot distribution method for extensive mimo system |
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| CN106788933A true CN106788933A (en) | 2017-05-31 |
| CN106788933B CN106788933B (en) | 2019-11-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890710A (en) * | 2021-10-09 | 2022-01-04 | 南京邮电大学 | Pilot frequency distribution method for large-scale de-cellular MIMO system |
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| WO2015008914A1 (en) * | 2013-07-17 | 2015-01-22 | Lg Electronics Inc. | Grouping based reference signal transmission for massive mimo scheme |
| CN104393972A (en) * | 2014-11-27 | 2015-03-04 | 山东大学 | User location information based large-scale MIMO system pilot frequency distribution method |
| WO2015149812A1 (en) * | 2014-04-01 | 2015-10-08 | Aalborg Universitet | Pilot decontamination through pilot sequence hopping in massive mimo systems |
| CN105049166A (en) * | 2015-08-17 | 2015-11-11 | 清华大学 | Pilot frequency distribution method based on user geographical location information in large-scale antenna cell |
-
2016
- 2016-12-02 CN CN201611096661.4A patent/CN106788933B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015008914A1 (en) * | 2013-07-17 | 2015-01-22 | Lg Electronics Inc. | Grouping based reference signal transmission for massive mimo scheme |
| WO2015149812A1 (en) * | 2014-04-01 | 2015-10-08 | Aalborg Universitet | Pilot decontamination through pilot sequence hopping in massive mimo systems |
| CN104393972A (en) * | 2014-11-27 | 2015-03-04 | 山东大学 | User location information based large-scale MIMO system pilot frequency distribution method |
| CN105049166A (en) * | 2015-08-17 | 2015-11-11 | 清华大学 | Pilot frequency distribution method based on user geographical location information in large-scale antenna cell |
Non-Patent Citations (1)
| Title |
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| JUN ZUO，ET AL.: "Multicell Multiuser Massive MIMO Transmission With Downlink Training and Pilot Contamination Precoding", 《IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890710A (en) * | 2021-10-09 | 2022-01-04 | 南京邮电大学 | Pilot frequency distribution method for large-scale de-cellular MIMO system |
| CN113890710B (en) * | 2021-10-09 | 2024-02-20 | 南京邮电大学 | Pilot frequency distribution method for de-cellular large-scale MIMO system |
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| Publication number | Publication date |
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| CN106788933B (en) | 2019-11-29 |
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