CN106788933B - A kind of pilot distribution method for extensive mimo system - Google Patents
A kind of pilot distribution method for extensive mimo system Download PDFInfo
- Publication number
- CN106788933B CN106788933B CN201611096661.4A CN201611096661A CN106788933B CN 106788933 B CN106788933 B CN 106788933B CN 201611096661 A CN201611096661 A CN 201611096661A CN 106788933 B CN106788933 B CN 106788933B
- Authority
- CN
- China
- Prior art keywords
- pilot
- user
- polar
- coordinate system
- cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention belongs to fields of communication technology, and in particular to a kind of pilot distribution method for extensive mimo system.Method of the invention, which is specifically included that, establishes polar coordinate system by pole of base station；Customer position information is converted into the polar coordinates under the coordinate system；The user in cell is ranked up according to the polar coordinates information of acquisition；It is that user distributes pilot tone according to ranking results.A possibility that beneficial effects of the present invention are, the present invention can be effectively reduced hypotelorism between the user for being multiplexed same pilot sequence, to achieve the purpose that reduce, pilot pollution, raising system be reachable and rate；By the orderly distribution to pilot tone, capable of effectively avoiding the problem that pilot pollution intensity that different user is subject to, there are bigger differences, improve the fairness of system；Compared with by the methods of enumerating the method for finding optimal pilot allocation plan, present invention utilizes the customer position informations for being easier to obtain, and avoid complicated simulation trial and multi-cell cooperating, have lower complexity.
Description
Technical field
The invention belongs to fields of communication technology, and in particular to a kind of pilot distribution method for extensive mimo system.
Background technique
With the rapid development of mobile Internet, demand of the user to high-speed data service rapidly rises, 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 have received widespread attention.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 is substantially reduced the influence of the interference such as noise.
In multi-user MIMO system, base station needs to obtain accurate channel state information (CSI) and comes to different user
Signal is separated.Under time division duplex (TDD) mode, uplink is trained to be completed within the same coherence time with data transmission.
Therefore, using the reciprocity of channel, in the ascending pilot frequency training stage, base station can be by carrying out letter to the pilot signal received
Estimate to obtain corresponding CSI in road.
With being increasing 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 lead to the problem of pilot pollution.Pilot pollution will seriously affect channel estimation
Accuracy and be substantially reduced the performance of system.In the extensive mimo system of multiple cell, it will usually use same community user
The pilot frequency sequence used is mutually orthogonal, and different community is 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 the pilot tone that intra-cell users use.The program
Complexity is lower, easily operated.However, random pilot tone distribution, which may result in pilot tone, distributes uneven problem, in certain user
While hardly interference by pilot pollution, certain customers may be because the hypotelorism of pilot frequency multiplexing and generate serious pilot tone
Pollution, while reducing system performance, has also seriously affected the fairness of system.For this problem, it is thus proposed that
Multiple co-operating methods of cell find out optimal pilot tone assembled scheme by cooperating between neighboring community, in the hope of
Pilot pollution minimizes.The program can theoretically minimize pilot pollution, but need complicated base station collaboration and higher
Computation complexity.
Result of study show signal strength can with the increase of transmission range fast-fading.Under normal circumstances, multiplexing is same
Distance is remoter 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 the technical conditions of existing maturation, such as global positioning system (GPS), user location
Information can be readily available.Based on the above background, the present invention proposes one based on user for the purpose of reducing pilot pollution
The pilot allocation scheme of location information.
Summary of the invention
In order to solve the problem above-mentioned, the invention proposes a kind of, and the extensive mimo system based on customer position information is led
Frequency allocation plan: being increased in transmission process with distance based on signal and the characteristic of fast-fading, the program pass through to pilot tone
Effectively distribution, in the case where seriously system complexity will not be increased, so that the distance between the user of multiplexing same pilot sequence
It is remote as far as possible, to reduce pilot pollution, achieve the purpose that improve system performance.
The technical solution of the present invention is as follows:
A kind of pilot distribution method for extensive mimo system, which comprises the following steps:
A. establish polar coordinate system: using base station location as pole, specific direction is polar axis, establishes polar coordinate system, different community
Under polar coordinate system polar axis direction having the same；
B. user's polar coordinates are obtained: according to the positional relationship between base station and user, the location information of user being converted to
Polar coordinates under the cell polar coordinate system of place, each polar coordinates include polar diameter r and polar angle θ, wherein
For constant, and
C. all users in cell are ranked up: useful to institute according to the size of polar angle θ in the coordinate information of acquisition
Family is ranked up, and the rule used that sorts is ascending or descending order；
It d. is that user distributes pilot tone: assuming that pilot length is N, then after using 1~N to be total to N number of consecution natural number as sequence
Customs Assigned Number；It enablesWhereinTo be rounded symbol downwards, then number is since γ, after reaching N,
Continue again from 1, until γ -1；User, which is followed successively by, according to the number of user distributes pilot tone.
Beneficial effects of the present invention are that the present invention can be effectively reduced distance mistake between the user for being multiplexed same pilot sequence
A possibility that close, to achieve the purpose that reduce, pilot pollution, raising system be reachable and rate；Pass through orderly dividing to pilot tone
Match, capable of effectively avoiding the problem that pilot pollution intensity that different user is subject to, there are bigger differences, improve the justice of system
Property；Compared with by the methods of enumerating the method for finding optimal pilot allocation plan, present invention utilizes the users for being easier to obtain
Location information avoids complicated simulation trial and multi-cell cooperating, has lower complexity.
Detailed description of the invention
Fig. 1 is extensive MIMO multiple cell multi-user TDD system illustraton of model, wherein each cell base station is by six groups of orientations
Aerial array composition；
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 according to directional antenna array to cell.
Specific embodiment
With reference to the accompanying drawing, the technical schemes of the invention are described in detail:
As shown in Figure 1, with extensive mimo system, by 7 cell groups, as example, the present invention is described in detail, each
Cell includes 16 single-antenna subscribers and an extensive antenna base station.Base station by 6 groups of outfits, 128 antennas directional aerial
Array composition, centered on base station, is covered each by the fan-shaped region that six angles are.Communication process uses tdd mode.In it is assumed that
Heart cell is Target cell, remaining cell is interfered cell.As shown in Fig. 2, pilot allocation scheme of the present invention include with
Lower specific steps:
Step 1, customer position information is obtained
The technology (e.g., GPS, Beidou satellite navigation system etc.) that the location information of user can use existing maturation obtains.
Step 2, polar coordinate system is established
Using base station as pole, a certain specific direction is that polar axis establishes polar coordinate system.Wherein, polar axis direction can be according to reality
It is specified, but all cells should select same direction as polar axis direction.In Fig. 3, the polar axis direction of all cells
It is due east direction.
Step 3, customer position information is converted into polar coordinates
The coordinate (r, θ) customer position information being converted under the polar coordinate system established in step 2, wherein r is polar diameter, θ
For polar angle, andWherein,For constant, andFor setting the minimum value of θ.In Fig. 3,
That is-π≤θ < π.
Step 4, it sorts
Ascending or descending order sequence is carried out to user according to the size of user θ.Ascending sort is used in Fig. 3.
Step 5, it 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, which is numbered, usually has following two mode: if 1, all cells
It all sets identicalValue, i.e. θ value range having the same, then Customs Assigned Number is since 1, until 16 end；2, false
As different community be set according to actual conditions it is differentValue enablesWhereinTo take downwards
Integral symbol, then number is since γ, after reaching 16, then from 1 continuation, until γ -1.As shown in figure 4, in same orientation day
In the coverage area of linear array, identical region lie farthest away is numbered, mutual interference is also therefore most weak.Above two number
The purpose of mode is provided to make the user in different community with identical number to be in the region of same number as far as possible.Figure
The first numbering is used in 3.
Step 6, pilot tone is distributed
Each Customs Assigned Number respectively corresponds an orthogonal pilot frequency sequence, is followed successively by user according to number and distributes pilot tone.It leads
Frequency allocation result is as shown in Figure 3.
Claims (1)
1. a kind of pilot distribution method for extensive mimo system, which comprises the following steps:
A. it establishes polar coordinate system: using base station location as pole, establishing polar coordinate system, the polar coordinate system under different community has identical
Polar axis direction；
B. user's polar coordinates are found out: according to the positional relationship between base station and user, where the location 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 normal
Number, and
C. the user in cell is ranked up: useful to the institute in cell according to the size of polar angle θ in the coordinate information of acquisition
Family is ranked up, and the rule used that sorts is ascending or descending order；
D. be that user distributes pilot tone: assuming that pilot length is N, if all cells all set it is identicalValue, i.e. θ have identical
Value range, then Customs Assigned Number is since 1, until N terminates；Otherwise, it enablesWherein
To be rounded symbol downwards, then number is since γ, after reaching N, then from 1 continuation, until γ -1；Each Customs Assigned Number difference
A corresponding orthogonal pilot frequency sequence is followed successively by user according to number and distributes pilot tone, so that the user of multiplexing same pilot sequence
Between distance it is remote as far as possible.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611096661.4A CN106788933B (en) | 2016-12-02 | 2016-12-02 | A kind of pilot distribution method for extensive mimo system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611096661.4A CN106788933B (en) | 2016-12-02 | 2016-12-02 | A kind of pilot distribution method for extensive mimo system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106788933A CN106788933A (en) | 2017-05-31 |
| CN106788933B true CN106788933B (en) | 2019-11-29 |
Family
ID=58884245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611096661.4A Active CN106788933B (en) | 2016-12-02 | 2016-12-02 | A kind of pilot distribution method for extensive mimo system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106788933B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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 |
| 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 |
|---|
| Multicell Multiuser Massive MIMO Transmission With Downlink Training and Pilot Contamination Precoding;Jun Zuo，et al.;《IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY》;20150901;第65卷(第8期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106788933A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104393972B (en) | A kind of extensive mimo system pilot distribution method based on customer position information | |
| CN102113395B (en) | Method of joint resource allocation and clustering of base stations | |
| CN101690296B (en) | For monitoring signal and the method and apparatus selecting based on monitoring result and/or using communications band | |
| CN110089044A (en) | Wave beam management based on group | |
| CN110114982A (en) | Based on by the synchronous wireless communication system of beam signal and method | |
| CN103945331B (en) | A kind of localization method for the angle estimation that using WIFI field strength leave away | |
| CN103957041B (en) | 3D wave beam shaping method for large-scale MIMO TDD system | |
| CN105636226B (en) | Dense distribution formula wireless network multi-user dispatching method based on static clustering | |
| CN105207705A (en) | Reference signal sending method, reference signal receiving method, reference signal sending device and reference signal receiving device in active antenna system | |
| CN104410480A (en) | Large-scale fading based pilot frequency distribution method in large-scale MIMO (multiple input multiple output) system | |
| CN106900074A (en) | A kind of accidental access method, device, relevant device and system | |
| US20190199415A1 (en) | Communication device and method used for multi-user spatial modulation | |
| EP3433940B1 (en) | Access node and method for transmitting control information in a wireless communication network | |
| CN104104625B (en) | Guarantee after precoding the successional method of channel phase and base station between RB group | |
| CN110519029A (en) | Honeycomb mixes extensive MIMO pilot frequency multiplexing channel obtaining method with V2V | |
| CN106059733A (en) | Method for enhancing demodulation reference signal and related equipment | |
| CN107733605B (en) | Channel measurement feedback method and device and pilot frequency sending method and device | |
| CN104320169A (en) | Method for designing three-dimensional beam forming in multi-user 3D-MIMO system | |
| CN109890075A (en) | A kind of suppressing method of extensive mimo system pilot pollution, system | |
| CN107592675B (en) | A kind of 3D-MIMO multi-cell downlink adaptive transmission method | |
| CN109150453A (en) | Wave beam management method, the network equipment and terminal | |
| CN107888255A (en) | The sending method of uplink reference signals, apparatus and system, base station and terminal | |
| Hoffmann et al. | Reinforcement learning for energy-efficient 5G massive MIMO: Intelligent antenna switching | |
| CN109167618A (en) | The extensive MIMO down channel of FDD is rebuild and multiuser transmission method | |
| CN106788933B (en) | A kind of pilot distribution method for extensive mimo system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |