CN105978836B - Multi-district pilots abatement of pollution method under extensive mimo system - Google Patents
Multi-district pilots abatement of pollution method under extensive mimo system Download PDFInfo
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- CN105978836B CN105978836B CN201610302112.1A CN201610302112A CN105978836B CN 105978836 B CN105978836 B CN 105978836B CN 201610302112 A CN201610302112 A CN 201610302112A CN 105978836 B CN105978836 B CN 105978836B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03305—Joint sequence estimation and interference removal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/0048—Decoding adapted to other signal detection operation in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03592—Adaptation methods
- H04L2025/03598—Algorithms
- H04L2025/03611—Iterative algorithms
- H04L2025/03636—Algorithms using least mean square [LMS]
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Abstract
The invention discloses a kind of multi-district pilots abatement of pollution methods under extensive mimo system.On existing Research foundation, propose that a kind of new pilot pollution mitigates method, it is intended to which the complexity for reducing algorithm eliminates pilot pollution by way of counteracting.The pilot tone cancellation schemes keep silent in its respective stage by respective cell, realize that pilot pollution is eliminated in other stage repeat its transmission pilot signals.This method can have using in environment and femtocell environment indoors by strong practicability.
Description
Technical field:
The invention belongs to 5G radio communication physical-layer techniques field, in particular to multiple cell under a kind of extensive mimo system
Method for eliminating pilot pollution.
Background technique:
With being skyrocketed through for the new business that mobile Internet and cloud computing are representative, intelligent terminal is become increasingly popular,
The increasingly growth of internet of things service, it is contemplated that 10 years following, mobile data services will develop at a speed unheard of before.On a large scale
Key technology for PHY of the MIMO as future 5G mobile communication, with its safety, low energy consumption, handling capacity is big, high-efficient etc. huge
Advantage, the concern by world research personnel.Extensive mimo system, by increase antenna for base station number to several hundred even
Thousands of, to obtain huge channel capacity and spectrum efficiency.Meanwhile the influence of channel uncorrelated noise and rapid fading will disappear
It loses, when uniform enconding method will tend to be optimal.
With continuing to increase for antenna for base station number, base station needs accurately to obtain current channel state information, to protect
Demonstrate,prove the reliability of channel.It, can be by channel reciprocity principle, to obtain channel status letter under time division duplex (TDD) mode
Breath.However, this will lead to the problem of it is new: pilot pollution.Since the pilot signal Spatial Dimension that terminal is sent is limited, so not
Evitable there are the user terminals of different community, and same pilot to be used to emit simultaneously, cannot be distinguished so as to cause base station, then
Form the pilot pollution problem.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes existing skill already known to those of ordinary skill in the art in any form
Art.
Summary of the invention:
The purpose of the present invention is to provide a kind of multi-district pilots abatement of pollution methods under extensive mimo system, thus gram
Take above-mentioned defect in the prior art.
To achieve the above object, the present invention provides
Multi-district pilots abatement of pollution method under extensive mimo system, the steps include:
(1) cellular network with L time synchronization is set, wherein the radius of single femtocell is R, and
The number of the cell-site antenna is M, and user terminal number is K；K-th of the m root antenna of first cell and j-th of cell
The dissemination channel factor between user can be expressed as{βjlkIt is nonnegative constant, { hjlkmIt is normalized to unit
1, that is,So, signal received by the m root antenna of first of cell can indicate are as follows:
Wherein, prFor user's pilot signal power, ζjkThe pilot frequency sequence sent for k-th of user of j-th of cell；ωlm
For independent identically distributed mean value be zero, variance isWhite Gaussian noise；
(2) Y is enabledl=[yl1yl2…ylM], Wl=[ωl1ωl2…ωlM], Djl=diag { [βjl1βjl2…βjlK], hjlk
=[hjlk1hjlk2…hjlkM], Hjl=[hjl1hjl2…hjlK], then the channel matrix of two minizones can indicate are as follows:
The pilot signal that first of cell receives can indicate are as follows:
Wherein Λl=[ζl1ζl2…ζlK], with least mean-square estimate (LS), formula (3) can be indicated are as follows:
Wherein,By formula (4) it is found that GllIt is expected pilot signal,For from other honeycombs
The pilot signal of user terminal, as pilot pollution；
(3) pilot pollution is eliminated:
A, channel estimation time is divided into L+1；
B, the 0th stage is named as Phase 0, Xiang Qixiang in the same time of all cellular terminal users at this stage
The Base Transmitter pilot signal of pass, the signal that one 1 base station of cell receives can indicate are as follows:
C, the 1st stage is named as Phase 1, and user in cell 1 keeps silent, the user in remaining cell simultaneously to
Respective cell pilot signal transmitted, the signal that one 1 base station of cell receives can indicate are as follows:
D, in the remaining L-1 stage, it is divided into:
D1, single cell keep silent:
In the remaining L-1 stage, only one cell of each stage keeps silent, remaining cell is simultaneously to respective
Base station pilot signal transmitted, the signal that one 1 base station of cell receives can indicate are as follows:
In 2≤l≤L stage, Y (l), which does not include, comes from first of cellular interference signal, calculates the sum of all Y (l), then
Have:
Wherein,
Estimated using least square (LS), normal equation is
Thus it obtains
According to its available evaluated error of formula (10)
D2, two cells keep silent:
Two cell silence situations are divided into asymmetric two cells silence and symmetrical two cell is silent；
D2-1, two cells are asymmetric silent, and within the remaining L-1 stage, each stage, two adjacent cells are protected
Silence is held, remaining cell is simultaneously to respective base station pilot signal transmitted；
D2-2, two cells are symmetrically silent, and symmetric case is divided into relative cell and is separated by cell.In the remaining L-1 stage,
In each stage, two cells keep silent, remaining cell is simultaneously to respective base station pilot signal transmitted；
The system estimation (LS) of two cells silence is
Wherein,
Its evaluated error are as follows:
Compared with prior art, the invention has the following beneficial effects:
It keeps silent in stages respectively by being separated by symmetrical cell, pilot pollution is then realized by least mean-square estimate
Elimination.Simulation result shows that this method achieves preferable effect in terms of complexity, practical application, system performance.
Detailed description of the invention:
Fig. 1 is pilot pollution schematic diagram；
Fig. 2 is uplink phases of training schematic diagram of the present invention；
Fig. 3 is silence situation schematic diagram in different community of the present invention；
Fig. 4 is that whether there is or not the channel estimation errors simulation result coordinate diagrams of pilot pollution by the present invention；
Fig. 5 is the system and rate simulating result coordinate diagram under different situations of the present invention；
Fig. 6 is system and rate simulating result coordinate diagram under the different path-loss factors of the present invention；
Fig. 7 is signal-to-noise ratio and channel estimation errors simulation result coordinate diagram under different situations of the present invention.
Specific embodiment:
Specific embodiments of the present invention will be described in detail below, it is to be understood that protection scope of the present invention is not
It is restricted by specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
As shown in Figs. 1-2, a kind of multi-district pilots abatement of pollution method under extensive mimo system, the steps include:
(1) cellular network with L time synchronization is set, wherein the radius of single femtocell is R, and
The number of the cell-site antenna is M, and user terminal number is K；K-th of the m root antenna of first cell and j-th of cell
The dissemination channel factor between user can be expressed as{βjlkIt is nonnegative constant, { hjlkmIt is normalized to unit
1, that is,So, signal received by the m root antenna of first of cell can indicate are as follows:
Wherein, prFor user's pilot signal power, ζjkThe pilot frequency sequence sent for k-th of user of j-th of cell；ωlm
For independent identically distributed mean value be zero, variance isWhite Gaussian noise；
(2) Y is enabledl=[yl1yl2…ylM], Wl=[ωl1ωl2…ωlM], Djl=diag { [βjl1βjl2…βjlK], hjlk
=[hjlk1hjlk2…hjlkM], Hjl=[hjl1hjl2…hjlK], then the channel matrix of two minizones can indicate are as follows:
The pilot signal that first of cell receives can indicate are as follows:
Wherein Λl=[ζl1ζl2…ζlK], with least mean-square estimate (LS), formula (3) can be indicated are as follows:
Wherein,By formula (4) it is found that GllIt is expected pilot signal,For from other honeycombs
The pilot signal of user terminal, as pilot pollution；
(3) pilot pollution is eliminated:
A, channel estimation time is divided into L+1；
B, the 0th stage is named as Phase 0, Xiang Qixiang in the same time of all cellular terminal users at this stage
The Base Transmitter pilot signal of pass, the signal that one 1 base station of cell receives can indicate are as follows:
C, the 1st stage is named as Phase 1, and user in cell 1 keeps silent, the user in remaining cell simultaneously to
Respective cell pilot signal transmitted, the signal that one 1 base station of cell receives can indicate are as follows:
D, in the remaining L-1 stage, it is divided into:
D1, single cell keep silent:
In the remaining L-1 stage, only one cell of each stage keeps silent, remaining cell is simultaneously to respective
Base station pilot signal transmitted, the signal that one 1 base station of cell receives can indicate are as follows:
In 2≤l≤L stage, Y (l), which does not include, comes from first of cellular interference signal, calculates the sum of all Y (l), then
Have:
Wherein,
Estimated using least square (LS), normal equation is
Thus it obtains
According to its available evaluated error of formula (10)
D2, two cells keep silent:
As shown in figure 3, two cell silence situations are divided into asymmetric two cells silence and symmetrical two cell is silent；
D2-1, two cells are asymmetric silent, within the remaining L-1 stage, each stage, two adjacent cells
Keep silent, remaining cell is simultaneously to respective base station pilot signal transmitted；
D2-2, two cells are symmetrically silent, and symmetric case is divided into relative cell and is separated by cell.In the remaining L-1 stage,
In each stage, two cells keep silent, remaining cell is simultaneously to respective base station pilot signal transmitted；
The system estimation (LS) of two cells silence is
Wherein,
Its evaluated error are as follows:
For the system performance of check algorithm, algorithm is emulated using MATLAB R2014a.Extensive MIMO
The parameter of TDD system is as follows:
Number of cells is L=7, and single subdistrict number of users is K=8, and single user pilot transmission power is pr=10dB, additivity
The variance of noisePath-loss factor β in cellll=1, section path-loss factor is βjl=a.
As shown in figure 4, being simulated emulation for the channel estimation errors under different section path-loss factors.Having
In the presence of pilot pollution, the channel estimation errors of system are continuously increased with the increase of section path-loss factor；Not yet
In the presence of having pilot pollution, system only exists noise, and channel estimation errors do not change with the variation of path-loss factor.Pilot tone
The presence of pollution has biggish inhibition for extensive MIMO TDD system performance.
As shown in figure 5, the condition certain for section path-loss factor, cancellation schemes under different situations, in base station
In the case that number of antennas is continuously increased, system is ever-increasing on the whole with rate.Two cells are separated by symmetric case
It is better than other cell silence schemes.Single subdistrict silence scheme is better than other two cells silent scheme simultaneously, mainly exists
In single subdistrict, silence makes more cells carry out downlink data transmission, so that system and rate increase.
As shown in fig. 6, the condition certain for antenna for base station number, when the path-loss factor in cell is continuously increased
When, system is constantly reduced with rate.When path-loss factor is lower than 0.28, single subdistrict silence situation is better than two
A cell silence situation；When path-loss factor is greater than 0.28, being separated by symmetrical cell silence situation, to be better than other several quiet
Silent situation.
As shown in fig. 7, section and cell in path-loss factor certain condition certain for antenna for base station number, when
When the signal-to-noise ratio of system is continuously increased, channel estimation errors are gradually become smaller.The channel estimation errors of two cell silence situations are wanted
It is better than the channel estimation errors of single subdistrict silence situation, about improvement 1.3dB.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (1)
1. a kind of multi-district pilots abatement of pollution method under extensive mimo system, it is characterised in that: the steps include:
(1) cellular network with L time synchronization is set, wherein the radius of single femtocell is R, and the bee
The number of nest antenna for base station is M, and user terminal number is K；The m root antenna of first cell and k-th of user of j-th of cell
Between the dissemination channel factor can be expressed as{βjlkIt is nonnegative constant, { hjlkmIt is normalized to unit 1, also
It isSo, signal received by the m root antenna of first of cell can indicate are as follows:
Wherein, prFor user's pilot signal power, ζjkThe pilot frequency sequence sent for k-th of user of j-th of cell；ωlmIt is only
The vertical mean value with distribution is zero, variance isWhite Gaussian noise；
(2) Y is enabledl=[yl1yl2…ylM], Wl=[ωl1ωl2…ωlM], Djl=diag { [βjl1βjl2…βjlK], hjlk=
[hjlk1hjlk2…hjlkM], Hjl=[hjl1hjl2…hjlK], then the channel matrix of two minizones can indicate are as follows:
The pilot signal that first of cell receives can indicate are as follows:
Wherein Λl=[ζl1ζl2…ζlK], with least mean-square estimate (LS), formula (3) can be indicated are as follows:
Wherein,By formula (4) it is found that GllIt is expected pilot signal,For from other phone users
The pilot signal of terminal, as pilot pollution；
(3) pilot pollution is eliminated:
A, channel estimation time is divided into L+1；
B, the 0th stage is named as Phase 0, relevant to its in the same time of all cellular terminal users at this stage
Base Transmitter pilot signal, the signal that one 1 base station of cell receives can indicate are as follows:
C, the 1st stage is named as Phase 1, and the user in cell 1 keeps silent, and the user in remaining cell is simultaneously to respective
Cell pilot signal transmitted, the signal that 1 base station of the one cell receives can indicate are as follows:
D, in the remaining L-1 stage, it is divided into:
D1, single cell keep silent:
In the remaining L-1 stage, only one cell of each stage keeps silent, remaining cell is simultaneously to respective base station
Pilot signal transmitted, the signal that one 1 base station of cell receives can indicate are as follows:
In 2≤l≤L stage, Y (l), which does not include, comes from first of cellular interference signal, calculates the sum of all Y (l), then has:
Wherein,
Estimated using least square (LS), normal equation is
Thus it obtains
According to its available evaluated error of formula (10)
D2, two cells keep silent:
Two cell silence situations are divided into asymmetric two cells silence and symmetrical two cell is silent；
D2-1, asymmetric two cell are silent, and within the remaining L-1 stage, each stage, two adjacent cells keep quiet
Silent, remaining cell is simultaneously to respective base station pilot signal transmitted；
D2-2, symmetrical two cell are silent, and symmetric case is divided into relative cell and is separated by cell；It is each in the remaining L-1 stage
In a stage, two cells keep silent, remaining cell is simultaneously to respective base station pilot signal transmitted；
The system estimation (LS) of two cells silence is
Wherein,
Its evaluated error are as follows:
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103634816A (en) * | 2013-11-01 | 2014-03-12 | 南京邮电大学 | Method for eliminating pilot pollution-based interference in multi-cell massive MIMO (Multiple Input Multiple Output) |
| CN104320170A (en) * | 2014-10-29 | 2015-01-28 | 西安交通大学 | Pilot pollution abatement beam forming method for large-scale MIMO system |
| CN104735792A (en) * | 2013-12-23 | 2015-06-24 | 华为技术有限公司 | Method and device for distributing pilot frequency resources |
| CN105049098A (en) * | 2015-06-15 | 2015-11-11 | 西安交通大学 | Partial pilot frequency multiplexing method for overcoming pilot pollution in large-scale MIMO system |
| CN105429688A (en) * | 2015-11-18 | 2016-03-23 | 清华大学 | Multi-cell pre-coding method for inhibiting pilot pollution in large-scale distributed antenna system |
-
2016
- 2016-05-06 CN CN201610302112.1A patent/CN105978836B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103634816A (en) * | 2013-11-01 | 2014-03-12 | 南京邮电大学 | Method for eliminating pilot pollution-based interference in multi-cell massive MIMO (Multiple Input Multiple Output) |
| CN104735792A (en) * | 2013-12-23 | 2015-06-24 | 华为技术有限公司 | Method and device for distributing pilot frequency resources |
| CN104320170A (en) * | 2014-10-29 | 2015-01-28 | 西安交通大学 | Pilot pollution abatement beam forming method for large-scale MIMO system |
| CN105049098A (en) * | 2015-06-15 | 2015-11-11 | 西安交通大学 | Partial pilot frequency multiplexing method for overcoming pilot pollution in large-scale MIMO system |
| CN105429688A (en) * | 2015-11-18 | 2016-03-23 | 清华大学 | Multi-cell pre-coding method for inhibiting pilot pollution in large-scale distributed antenna system |
Non-Patent Citations (2)
| Title |
|---|
| Massive MIMO多小区系统中导频污染减轻方法;周志超;《系统工程与电子技术》;20160229;第38卷(第2期);全文 |
| 大规模MIMO多小区TDD 系统中的导频污染减轻方法;王海荣;《信号处理》;20130225;第29卷(第2期);全文 |
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