CN106059643B - A kind of method for eliminating pilot pollution based on large scale array antenna cellular communication system - Google Patents
A kind of method for eliminating pilot pollution based on large scale array antenna cellular communication system Download PDFInfo
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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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—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 simultaneous transmission
- H04B7/0615—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 simultaneous transmission of weighted versions of same signal
- H04B7/0617—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 simultaneous transmission of weighted versions of same signal for beam forming
-
- 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
- H04B7/0452—Multi-user MIMO systems
-
- 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
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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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
- H04L5/0051—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
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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
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
Abstract
A kind of method for eliminating pilot pollution based on large scale array antenna cellular communication system, pilot pollution is eliminated by pilot tone twice and the method for wave beam forming, the present invention passes through 2 pilot tones, 2 major channel informations obtain with the method for 2 beam shapings and eliminate the pilot pollution problem, eliminate the pilot pollution problem based on large scale array antenna cellular communication system.Moreover, because secondary pilot tone enables base station to obtain the channel information from other community users, therefore cooperate between allowing system to realize base station/cell in second of wave beam forming, to further improve the performance of system.
Description
Technical field
The present invention relates to communication technique fields, especially in the multiple cell time division multiplexing honeycomb using large scale array antenna
Pilot pollution and inter-cell interference are eliminated in communication system, thus the method for lifting system capacity.
Background technique
With the fast development of information technology, demand of the people to high-speed mobile communication system also rapid growth, in order into
One step improves system performance, and AT&T Labs proposes the method using large scale array antenna.In large scale array antenna bee
In nest communication system, each base station uses up to a hundred or even thousands of a antennas, by pilot tone, channel information acquisition and wave beam forming
Three phases, base station can give one independent channel of each user, so that each user is allowed to use all frequency spectrum resources,
This is greatly improved power system capacity.And in theory, the array antenna wireless telecommunication system in single-cell environment is
System capacity can continue to increase with the increase of antenna number, if antenna number tends to be infinite, system performance can also tend to be infinite.
Therefore large scale array antenna is also considered as the backbone technology of next-generation mobile communcations system.However, although in single cell item
Under part, large scale array antenna system provides good performance, but in multi cell cellular net, due to pilot number
It is limited, it is therefore desirable to be reused in different cells, so that the pilot pollution problem can be brought, pilot pollution can bring channel
Information estimates mistake, and in subsequent wave beam forming, it will lead to inter-cell interference using contaminated channel information, thus
Reduce system performance.The problem of mathematical model and emulation experiment all demonstrate, and pilot pollution is brought will not be with the increasing of antenna number
Be subject to and the promotion of base-station transmitting-power and disappear, therefore pilot pollution significantly limits the bee using large scale array antenna
The performance of nest mobile communcations system.
In order to solve this problem, many scholars are proposed certain methods to attempt to solve this problem, or reduce
Influence of this problem to system performance.Wherein simplest method is the Thomas L.Marzetta etc. by AT&T Labs
What people proposed, pilot pollution is evaded based on partial frequency multiplexing mode.This method is by the way that entire frequency spectrum resource to be divided into
Then multiple sub-blocks allow the cell closed on using different frequency sub-blocks, due to not being overlapped between different spectral sub-block,
The pilot pollution problem will not be formed.Although partial frequency multiplexing method can evade the pilot pollution problem, simultaneously because every
A cell can only use limited frequency spectrum resource, therefore power system capacity is also greatly lowered therewith.Y.Haifan et al. is then logical
It crosses on the basis of research channel statistic and proposes the method for angle of arrival distribution estimation to reduce the interference of pilot pollution, still
This method needs to obtain the second-order statistics of channel first, and in the case where angle of arrival is distributed biggish situation, such as city ring
Performance is very poor under border, thus this method and do not have very strong applicability.F.Fernandes et al. is proposed by making
Sending mechanism with asynchronous pilot tone come the method that reduces pilot pollution, although this method has a stronger applicability, but due to
The pilot signal of asynchronous transmission pilot tone, a cell may be interfered by the downlink data signal of other cells, and due to
Downlink signal intensity is typically larger than uplink signal strength, therefore this interference is often strong jamming, due to strongly disturbing presence, leads to
The channel information for crossing pilot extraction also brings along biggish error, to influence system performance.
Summarizing above all methods can be seen that the method in addition to partial frequency multiplexing, and other methods all can not be complete
The pilot pollution problem is eliminated, system performance will not be continued for increasing with the increase of antenna number.And partial frequency multiplexing
Although method can evade the pilot pollution problem, the capacity of system is greatly sacrificed.In view of wireless telecommunication system sheet
The application environment of body is different, and range is wide, develops the features such as fast, it is necessary to a kind of strong applicability, the small scheme of overhead, and
It can adapt to the pilot pollution technology for eliminating of wireless telecommunication system development trend.
Summary of the invention
In order to overcome the shortcomings of the above method, the present invention by pilot tone twice and twice, lead to eliminate by the method for wave beam forming
Frequency pollution problem, lifting system capacity.Method suitable environment of the invention is wide, can be useful in city, suburb and rural area etc.
In different cellular based communication scenes；System overhead is small, it is only necessary to increase on the basis of traditional large scale array antenna expense
Very limited a pilot-frequency expense is added to can be achieved with the significant increase of system performance；The present invention also adapts to the following radio mobile communication
In development process, base station number increases, and inter-cell interference increases and the increased general trend of antenna for base station number, is mentioned using the present invention
Method out can allow system performance lasting promotion with the increase of antenna number.
The technical scheme adopted by the invention is that: a kind of pilot pollution based on large scale array antenna cellular communication system
Removing method eliminates pilot pollution by pilot tone twice and the method for wave beam forming, it is characterized in that the following steps are included:
Step 1, first time pilot tone are sent, and all users send pilot tone, and the different user in a cell uses different
Pilot tone, different community are multiplexed the same pilot group；
Step 2, first time estimating channel information, each base station receives pilot tone, and pilot tone is conjugated P* multiplied by it to obtain
To channel information；
Step 3, each cell use wave beam forming coding method using the channel parameter of its intra-cell users obtained
To construct wave beam formed matrix U, realization wave beam forming；
Step 4, secondary pilot tone are sent, and all users in cell use identical pilot tone, other cells use different
Pilot tone；
Step 5, receives and handles secondary pilot tone, the figuration matrix that base station obtains the signal received multiplied by step 3,
Therefore base station can obtain the signal from different user respectively；
Step 6, all base stations obtain full subscriber channel parameter；
Step 7 constructs secondary wave beam forming matrix V using the equivalent channels information of acquisition；
Step 8 uses each base station the wave beam formed matrix U of first stage, and uses second stage to whole network
Wave beam formed matrix V send data, different base station sends the data of user demand, system interference to same user at this time
It completely eliminates, system performance is promoted.
Assuming that each base station possesses M antenna, K user is possessed in a cell, whole network is by L cell institute structure
At.In the first phase, all users in single subdistrict use different pilot tones, orthogonal between pilot tone, it is therefore desirable to K
Orthogonal pilot tone, so the length τ of this group of pilot tonep1≥K.Same group of pilot tone is reused by different cells.All users are same
When send pilot tone ψk, base station i reception pilot signal acquisition YiP1.Since different community uses same group of pilot tone, base station is connect
User information of the pilot tone received in addition to covering this cell, also contains the pilot tone of the user of other cells, that is, tradition is recognized
For pilot pollution.
Since pilot tone is orthogonal in cell, using orthogonal guide frequency, base station can estimate small from this respectively
The channel information of different user in area.Specifically, for user k, channel information hik=Yip1×ψk *, for base station i
Speech, can constitute a K multiplied by the matrix H of M by the way that the channel information of different user combinesi.Since there are pilot tone dirts
Dye, therefore the channel information estimated contains the channel information from other community users to this cell base station.
Using channel matrix H i use encoder F1, (F1 can be Conjugate Beforming encoder or
The encoders such as Zero-Forcing encoder) M can be constructed multiplied by K wave beam formed matrix Ui.Utilize wave beam formed matrix
Ui, an independent channel can be created for each user in cell i.Identical method is used to other cells in network
To obtain U respectively1(1=1...L).The method in above-mentioned stage is consistent with the method for traditional large scale array antenna cellular system.
Since the channel information estimated also contains the channel information that other cells reach this cell base station, the knot of wave beam forming
Fruit allow this cell base station in addition to receive the signal of this community user can also receive from adjacent cells use same pilot use
The signal at family.
In second stage, all users in a cell use the same pilot tone ξi, the user in different community makes
With different pilot tone ξl, (1=1...L).L orthogonal pilot tones are just needed for L cell, so the length of pilot group is L.
All users send pilot tone simultaneously, and base station i receives pilot signal and obtains YiP2。
Then the wave beam formed matrix U that base station constructs the pilot signal of acquisition multiplied by the first stagei, obtain YiP22.Due to
U is usedi, each user in the i of base station can obtain independent channel, therefore base station can be distinguished in this cell not
With the signal of user.
Y at this timeiP22Each element on middle diagonal line has respectively represented the information of different user in cell i and has come from it
His cell uses the information of the user of same pilot in the first phase.Then Y is allowedip22K-th of element multiplies respectively on diagonal line
With the conjugation ξ of the pilot tone of different communityl *Can allow base station i obtains that base station i obtains respectively between user k in cell 1
Channel informationSo base station i can be obtained in all cells including carrying out self-contained intra-cell users k
User k reach base station i channel information.Y is handled with same methodiP22Other elements on diagonal line can obtain cell
Different user reaches the channel information of base station i and the channel information of other intra-cell users arrival base station i in i.Due to channel
Information can obtain respectively, therefore also eliminate the need for the pilot pollution problem.Other cells are similarly handled, using coming from
The channel information of the different user of different communityUser k in different community is reached to the channel letter of different base station
Breath combines and can construct matrix Bk.For using the user of other pilot tones also to do same processing, to obtain Bk(k=
1...K matrix B) is utilizedk, so that it may using encoder F2 (F2 can be Conjugate Beforming encoder or
The encoders such as Zero-Forcing encoder) building minizone cooperative beam excipient matrix Vk.For using the use of other pilot tones
Same processing is also done at family, to obtain Vk(k=1...K)
When sending or receiving data-signal, the user k in cell 1 uses first time beam shaping matrix U1With
Second of beam shaping matrix VkTo send or receive signal.Specifically, for the user k's in base station i to be sent to
Data-signal qki, different base station 1 respectively multiplied byThen multiplied byTo send.Therefore base
The user k to stand in i will receive the identical data-signal from different base station, and carry out synthesis to further improve
The performance of system.And for the signal that user sends, it can also be received with 2 times similar beam shaping precodings,
Performance also can to promoted.To other, all users can be used same method and handle.
Compared with prior art, the present invention is obtained by 2 pilot tones, 2 major channel informations and the method for 2 beam shapings is come
The pilot pollution problem is eliminated, the pilot pollution problem based on large scale array antenna cellular communication system is eliminated.Moreover, because
Secondary pilot tone enables base station to obtain the channel information from other community users, therefore allows in second of wave beam forming and be
System cooperates between realizing base station/cell, to further improve the performance of system.In addition, method proposed by the invention
To signal statistics such as direction of arrival, there is no specific demands, therefore can apply in different wireless propagation environments
In.And for the different network architectures such as distributing antenna system, limited cooperation cell etc., the present invention, which can be promoted effectively, is
System capacity.
In addition to using 2 pilot tones, 2 major channel informations are obtained other than the mentality of designing with 2 beam shapings, are also started herein
Property propose all users allowed in the same cell in second stage again using identical pilot tone, and pass through first stage wave
Beam excipient matrix receives and handles secondary pilot signal, to ensure that pilot signal just while reducing pilot-frequency expense
Really obtain.From the point of view of simulation result, although pilot length extends to K+L from traditional K, a little overhead is increased,
It is contemplated that the system performance after overhead still has great promotion.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1,2,3 be in the system for assuming network that one is made of 7 cells under different coding device combination condition,
Different base station antenna number, different user number with it is small under different received signal to noise ratio conditions (assuming that uplink and downlink signal-to-noise ratio is consistent)
Area's spectrum efficiency.The correlation time of this system is 14 symbols, and correlation bandwidth is 14 subcarriers, and all base stations reach user
Power it is identical._ wherein Ccjcj (solid line) be 2 stages all using conjugation precoding beam figuration (conjugate
Beamforming the performance in the case of), Czfzf (chain-dotted line) are 2 stages using urgent Zero-code wave beam forming (Zero-
Forcing Beamforming) in the case of performance.Ccjzf (section dotted line) is then the first stage using conjugation, and second stage makes
With the performance in the case of urgent Zero-code wave beam forming, Czfej (pecked line) is then the first stage using force zero, and second stage uses
Performance in the case of conjugation coding wave beam forming.Classical (heavy line) is then the property of classical large scale array antenna model
Energy.
Wherein Fig. 1 assumes that the signal-to-noise ratio that receives of base station and the transmission signal of user is 0dB, and the number of users of each cell is 10
A, horizontal axis is antenna number, and the longitudinal axis is the actual spectrum efficiency in cell.
Fig. 2 assumes that the signal-to-noise ratio that receives of base station and the transmission signal of user is 0dB, and antenna for base station number is 100, and horizontal axis is
The number of users of each cell, the longitudinal axis are the actual spectrum efficiency in cell.
Fig. 3 assumes that antenna for base station number is 100, and the number of users of each cell 10, horizontal axis is the transmission of base station and user
Signal receives signal-to-noise ratio, and the longitudinal axis is the actual spectrum efficiency in cell.
Fig. 4 is implementing procedure of the present invention
Fig. 5 is the schematic diagram that first time of embodiment of the present invention pilot tone is sent
Fig. 6 is the schematic diagram that the embodiment of the present invention uses wave beam forming precoding 1
Fig. 7 is the schematic diagram that second of pilot tone of the embodiment of the present invention is sent
Fig. 8 is the schematic diagram that the embodiment of the present invention obtains full Cell Channel Information
Fig. 9 is the schematic diagram of the data of wave beam forming transmission twice of the embodiment of the present invention
Specific embodiment
The present invention will be further described below in conjunction with the embodiments.
Embodiment 1
Below for the pilot pollution elimination side proposed by the invention based on large scale array antenna cellular communication system
The technical issues of method is described in detail in conjunction with the accompanying drawings and embodiments, while also narration the present invention program solves and beneficial effect, need
, it is noted that description embodiment is intended to not play it any restriction effect convenient for the understanding of the present invention.
In order to more clearly illustrate the workflow and specific effect of the method for the present invention, it will be assumed that a simple network
Structure, by 3 base stations in this network structure, 3 cells are constituted, and each cell possesses 2 single-antenna subscribers.For the ease of
Explanation, it will be assumed that each base station possesses unlimited antenna.It should be pointed out that when antenna number is infinite, system performance
It is optimal, but the system antenna number actually used is usually limited, therefore can bring certain performance degradation, is decayed
Performance afterwards can find out trend by Fig. 1, thus while the present embodiment is explained with the infinite hypothesis of antenna number, actually answer
The present invention can also reach due effect in the case where limited antenna in, and the application example is mainly using unlimited antenna
For convenience of explanation, appointing system not can only operate under the conditions of this.
Step 1, first time pilot tone are sent.All users send pilot tone, and the different user in a cell uses different
Pilot tone, different community are multiplexed the same pilot group.So as shown in figure 5, the user 2 in user 1 and cell 1 in cell 1 makes
With different pilot tones, the user 1 in the user 1 and cell 3 in user 1 and cell 2 in cell 1 uses same pilot tone P11,
Indicated by the solid line, the user 2 in the user 2 and cell 3 in user 2 and cell 2 in cell 1 uses same pilot tone P12, uses
Pecked line indicates.As can be seen that the pilot tone that user sends be received in addition to by this cell base station, it also can be by the base station of adjacent cells
Receive, as shown in figure middle section dotted line and chain-dotted line.
Step 2, first time estimating channel information.Each base station receives pilot tone, and pilot tone is conjugated P multiplied by it*To
To channel information.Signal as base station 1 is subject to is Y1=(H1 11+H1 21+H1 31)P11+(H1 12+H1 22+H1 32) P12, wherein H1 11
Refer to channel parameter of the user 1 of cell 1 to base station 1, H1 21It is the user 1 of cell 2 to the channel parameter of base station 1, other can
To analogize.Base station utilizes the conjugation P11 of pilot tone P11*To obtain P11 multiplied by reception signal** Y1=(H1 11+H1 21+H1 31)P11**
P11+(H1 12+H1 22+H1 32)P11** P12, because P11 and P12 are orthogonal, result P11** Y1=(H1 11+H1 21+H1 31)=
Hc1 11.It can be seen that the channel information of the user 1 in cell 1 is by the dry of the signal for using same pilot tone from other cells
It disturbs, forms pilot pollution, Hc1 11For the channel information for having estimation mistake slave the user 1 in cell 1 to base station 1 being interfered.
User 2 in cell 1 can be used similar method with the channel parameter of the user in other cells and obtain, they are to have to estimate
Count the channel information of mistake.
Step 3, each cell use wave beam forming coding method using the channel parameter of its intra-cell users obtained
(the methods of conjugation or force zero) Lai Shixian wave beam forming.Such as, for base station 1, by Hc1 11And Hc1 12Merge into matrix Hc1, and
Wave beam formed matrix U1 (force zero U=f (H is obtained using encoderc1)=Hc1 -1Or conjugation U=f (Hc1)=Hc1 *).Other
Base station uses identical method.Classical large scale array antenna cellular system receives data-signal using U1 at this time, can from Fig. 6
It is same although base station 1 can receive respectively and distinguish the signal (solid line or dotted line signal) from this community user to find out
When can also receive signal (section dotted line or chain-dotted line indicate) from other cells using the user of same pilot, thus shape
At interference.Since this interference will not disappear with the increase of antenna number, this is also regarded as the bottle of classical system
Where neck.
Step 4, secondary pilot tone are sent.All users in cell use identical pilot tone, other cells use different
Pilot tone.As shown in fig. 7, the user 1 and user 2 in cell 1 use P21, indicated by the solid line, 2 user 1 of cell and user 2 are
It using P22, is indicated with section dotted line, 3 user 1 of cell and user 2 use P23, are indicated with pecked line.
Step 5 receives and handles secondary pilot tone.The figuration matrix that base station obtains the signal received multiplied by step 3,
Therefore base station can obtain the signal from user 1 and user 2 respectively.Specifically, base station 1 uses two that U1 is sent multiplied by user
Secondary pilot signal.By using U1, base station 1 generates 2 wave beams respectively, as shown in figure 8, with fan-shaped solid line and pecked line table
Show.
Step 6 obtains full subscriber channel parameter.Due to using wave beam formed matrix U1, the wave beam 1 of base station 1 is (left in figure
Fan-shaped solid line indicates in upper angle cell) it receives from the signal b for obtaining user 1 in cell 11 11P21, the user 1 from cell 2
Signal b1 21The signal b of P22 and the user 1 from cell 31 31P23, wherein b1 11It is small after a wave beam forming
The user 1 in area 1 arrives the equivalent channel parameter of base station 1.At this time by using P21*, P22*, P23*Come the letter received multiplied by wave beam 1
It number is able to obtain b1 11, b1 21And b1 31.It can be obtained with other cells using similar method by the wave beam 2 to cell 1
Each user in each cell reaches the equivalent channel parameter of all base stations.It can be seen from the figure that due to having used single order
Wave beam and minizone difference pilot tone, each received multiple signals in base station of each user's arrival can obtain independent
The linear combination of wave beam and signal, same combination will not occur for second, therefore system can estimate that respectively different user arrives
Up to the channel parameter of different base station, without will form pollution.
Step 7 constructs secondary wave beam forming matrix V using the equivalent channels information of acquisition.Specifically, by first
Stage uses all equivalent channel parameter b of pilot tone P111 11, b1 21, b1 31, b2 11, b2 21, b2 31, b3 11, b3 21, b3 31It is combined into square
Battle array B1, using all equivalent channel parameter combinations of pilot tone P12 at matrix B 2.Wave beam forming square is obtained using method for precoding
Battle array V1 (force zero V1=f (B1)=B1-1Or conjugation V1=f (B1)=B1*), B2 is obtained with same method, to obtain
The wave beam formed matrix of the second stage of different user.
Step 8 uses each base station the wave beam formed matrix U of first stage, and uses second stage to whole network
Wave beam formed matrix V send data, different base station sends the data of user demand (in Fig. 9 to same user at this time
Identical line style indicates that the user 2 in user 2 and cell 3 in cell 2 obtains the effect of same minizone cooperation, due to line
Shape is limited, comes so not being depicted in legend), system interference completely eliminates, and system performance is promoted.Systems stay sends number
According to terminating until correlation time.Whole flow process is repeated within next correlation time.
The above method is implemented based on 3 cell conditions, and the present invention can be applied in practical application is constituted in any quantity cell
Network in.It is contemplated that actual overhead and annoyance level, this method can be made in actual application
Certain modification allows 3 or 7 cells closed on using different second order pilot tones such as in the network of a super large, and for
Farther away cell can then be multiplexed same group of two-stage pilot tone, although in this way can introducing portion interference, due to distance compared with
Far, therefore interference is smaller.So method proposed by the invention may need to modify in practical applications, specific application strategy
Depending on actual state, but the spirit and principle that its essence or this method are proposed.
The foregoing is merely one embodiment of the present of invention, are not intended to limit the invention.It is all of the invention
Within spirit and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (1)
1. a kind of method for eliminating pilot pollution based on large scale array antenna cellular communication system, by pilot tone twice and twice
The method of wave beam forming eliminates pilot pollution, it is characterized in that the following steps are included:
Step 1, first time pilot tone are sent, and all users send pilot tone, and the different user in a cell is led using different
Frequently, different community is multiplexed the same pilot group；
Step 2, first time estimating channel information, each base station receives pilot tone, and pilot tone is conjugated P* multiplied by it to obtain letter
Road information；
Step 3, each cell are come using the channel parameter of its intra-cell users obtained using wave beam forming coding method real
Existing wave beam forming；
Step 4, secondary pilot tone are sent, and all users in cell use identical pilot tone, other cells are led using different
Frequently；
Step 5, receives and handles secondary pilot tone, the figuration matrix that base station obtains the signal received multiplied by step 3, therefore
Base station can obtain the signal from user 1 and user 2 respectively；
Step 6 obtains full subscriber channel information；By using the signal that the conjugation processing wave beam of pilot tone receives, obtain each small
Each user in area reaches the equivalent channels information of all base stations；
Step 7 constructs secondary wave beam forming matrix V using the equivalent channels information of acquisition；Believed using the equivalent channel of acquisition
Breath is combined into homography, constructs secondary wave beam forming matrix V using wave beam forming coding method according to these matrixes；
Step 8 uses each base station the wave beam formed matrix U of first stage, and uses whole network the wave of second stage
Beam figuration matrix V sends data, and different base station sends the data of user demand to same user at this time, and system interference is complete
It eliminates, system performance is promoted.
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