CN106059643A - Pilot pollution elimination method based on large-scale array antenna cellular communication system - Google Patents
Pilot pollution elimination method 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 pilot pollution elimination method based on a large-scale array antenna cellular communication system eliminates pilot pollution through a two pilot-frequency and beam-forming method. Through a method of 2 pilot frequency, 2 channel information obtaining and 2 beam forming, the problem of pilot pollution is eliminated, and the problem of pilot pollution based on the large-scale array antenna cellular communication system is eliminated. And channel information from other cell users can be obtained due to secondary pilot frequency, so a system achieves base-station/cell cooperation in secondary beam forming, and then system performance is further improved.
Description
Technical field
The present invention relates to communication technique field, particularly at the multiple cell time division multiplex honeycomb using large scale array antenna
Elimination pilot pollution and presence of intercell interference in communication system, thus the method promoting power system capacity.
Background technology
Along with the fast development of information technology, the demand of high-speed mobile communication system is the most quickly increased by people, in order to enter
One step improves systematic function, and AT&T Labs proposes the method for application large scale array antenna.Large scale array antenna honeybee
In nest communication system, each base station uses up to a hundred the most thousands of antennas, by pilot tone, channel information acquisition and wave beam forming
Three phases, base station can give each user one independent channel, thus allow each user use all of frequency spectrum resource,
This is greatly improved power system capacity.And in theory, the array antenna wireless telecommunication system in single-cell environment be
System capacity can continue to increase along with the increase of antenna number, if antenna number tends to infinite, systematic function also can tend to infinite.
Therefore large scale array antenna is also considered as the backbone technology of mobile communcations system of future generation.But, although at single community bar
Under part, large scale array antenna system provides good performance, but in multi cell cellular net, due to pilot number
Limited, it is therefore desirable to reuse in different communities, thus the pilot pollution problem can be brought, pilot pollution can bring channel
Information estimates mistake, and in wave beam forming subsequently, uses contaminated channel information to may result in presence of intercell interference, thus
Reduce systematic function.Mathematical model and emulation experiment all demonstrate, and the problem that pilot pollution brings will not be along with the increasing of antenna number
Add and the lifting of base-station transmitting-power and disappear, therefore pilot pollution significantly limit application large scale array antenna honeybee
The performance of nest mobile communcations system.
In order to solve this problem, many scholars are proposed certain methods and attempt to solve this problem, or reduce
The impact on systematic function of this problem.The most simplest method is by the Thomas L.Marzetta etc. of AT&T Labs
People proposes, and evades pilot pollution based on partial frequency multiplexing mode.This method is by being divided into whole frequency spectrum resource
Multiple sub-blocks, then allow the community closed on use different frequency sub-blocks, owing to not having overlap between different spectral sub-block, therefore
Also the pilot pollution problem will not be formed.Although partial frequency multiplexing method can evade the pilot pollution problem, but simultaneously because every
Individual community can only use limited frequency spectrum resource, and therefore power system capacity is greatly lowered the most therewith.Y.Haifan et al. is then logical
The method arriving angular distribution estimation is proposed to reduce the interference of pilot pollution on the basis of crossing research channel statistic, but
This method needs first to obtain the second-order statistics of channel, and in the case of arrival is angular distribution relatively greatly, such as city ring
Under border, performance is very poor, and therefore this method does not have the strongest suitability.F.Fernandes et al. proposes by making
The method that mechanism reduces pilot pollution is sent by asynchronous pilot tone, although this method has a stronger suitability, but due to
Asynchronous transmission pilot tone, the pilot signal of a community may be disturbed by the downlink data signal of other communities, and due to
Downstream signal intensity is typically larger than uplink signal strength, and therefore this interference strong jamming often, due to strongly disturbing existence, logical
The channel information crossing pilot extraction also brings along bigger error, thus affects systematic function.
Sum up above all methods it can be seen that except the method for partial frequency multiplexing, additive method all cannot be complete
Eliminating the pilot pollution problem, systematic function also will not be continued for along with the increase of antenna number increasing.And partial frequency multiplexing
Although method can evade the pilot pollution problem, but greatly sacrifices the capacity of system.In view of wireless telecommunication system originally
The features such as the applied environment of body is different, and scope is wide, and development is fast, it is necessary to a kind of suitability is strong, the scheme that overhead is little, and
Can adapt to the pilot pollution technology for eliminating of wireless telecommunication system development trend.
Summary of the invention
In order to overcome the deficiency of said method, the present invention is eliminated by the method for twice pilot tone and twice wave beam forming and leads
Frequently pollution problem, promotes power system capacity.The method suitable environment of the present invention is wide, it is possible to be useful in city, suburb and rural area etc.
In different cellular based communication scenes；System overhead is little, it is only necessary to increase on the basis of tradition large scale array antenna expense
Add very limited pilot-frequency expense and can be achieved with the significant increase of systematic function；The present invention also adapts to following radio mobile communication
In evolution, base station number increases, the general trend that presence of intercell interference increases and antenna for base station number increases, and uses the present invention to be carried
The method gone out can allow systematic function persistently promote along with the increase of antenna number.
The technical solution adopted in the present invention is: a kind of pilot pollution based on large scale array antenna cellular communication system
Removing method, eliminates pilot pollution by the method for twice pilot tone and wave beam forming, it is characterized in that comprising the following steps:
Step one, pilot tone sends for the first time, and all users send pilot tone, and the different user in a community uses different
Pilot tone, the same pilot group of different districts multiplexing；
Step 2, for the first time estimating channel information, each base station receive pilot tone, and pilot tone is multiplied by its conjugation P* thus
To channel information；
Step 3, each community uses the channel parameter of its intra-cell users obtained to use wave beam forming coded method
Build wave beam formed matrix U, it is achieved wave beam forming；
Step 4, secondary pilot tone sends, and all users in community use identical pilot tone, and other communities use different
Pilot tone；
Step 5, accepts and processes secondary pilot tone, and the signal received is multiplied by the figuration matrix that step 3 obtains by base station,
Therefore base station can obtain the signal from different user respectively；
Step 6, all base stations obtain full subscriber channel parameter；
Step 7, utilizes the equivalent channels information obtained to build secondary wave beam forming matrix V；
Step 8, uses the wave beam formed matrix U of first stage to each base station, and to whole Web vector graphic second stage
Wave beam formed matrix V send data, now different base station sends the data of user's request, system interference to same user
Being completely eliminated, systematic function promotes.
Assuming that each base station has M antenna, have K user in a community, whole network is by L community institute structure
Become.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 length τ of this group pilot tonep1≥K.Same group of pilot tone is reused by different communities.All users are same
Time send pilot tone ψk, base station i receives pilot signal and obtains YiP1.Owing to different districts uses same group of pilot tone, therefore base station connects
The pilot tone received, except containing the user profile of this community, also contains the pilot tone of the user of other communities, and namely tradition is recognized
For pilot pollution.
Owing in community, pilot tone is orthogonal, therefore, utilizing orthogonal guide frequency, base station just can estimate from this little respectively
The channel information of different user in district.Specifically, for user k, its channel information hik=Yip1×ψk *, for base station i
Speech, just can constitute a K by being combined by the channel information of different user and be multiplied by the matrix H of Mi.Dirty owing to there is pilot tone
Dye, the channel information therefore estimated contains the channel information from other community users to this cell base station.
Utilize channel matrix H i use encoder F1, (F1 can be Conjugate Beforming encoder or
The encoders such as Zero-Forcing encoder) just can build a M and be multiplied by K wave beam formed matrix Ui.Utilize wave beam formed matrix
Ui, just can create an independent channel for each user in cell i.Other communities in network are used identical method
Obtain U respectively1(1=1...L).The method in above-mentioned stage is consistent with the method for tradition large scale array antenna cellular system.
Channel information owing to estimating also contains other communities and arrives the channel information of this cell base station, the therefore knot of wave beam forming
Fruit allow this cell base station except accept the signal of this community user also can receive from adjacent cells use same pilot use
The signal at family.
In second stage, all users in a community use same pilot tone ξi, the user in different districts makes
By different pilot tones ξl, (1=1...L).L orthogonal pilot tone is accomplished by for L community, so a length of L of pilot group.
All users send pilot tone simultaneously, and base station i accepts pilot signal and obtains YiP2。
Then the pilot signal of acquisition is multiplied by the wave beam formed matrix U of first stage structure by base stationi, it is thus achieved that YiP22.Due to
Employ Ui, each user in the i of base station can obtain independent channel, therefore allows base station can distinguish in this community not
Signal with user.
Now YiP22Each element on middle diagonal represents the information of different user in cell i and respectively from it
His community uses the information of the user of same pilot in the first phase.Then Y is allowedip22On diagonal, kth element is taken advantage of respectively
Conjugation ξ with the pilot tone of different districtsl *Base station i just can be allowed to obtain respectively, and base station i obtains between user k in community 1
Channel informationSo base station i is obtained in that self-contained intra-cell users k is in interior all communities
User k arrive base station i channel information.Y is processed by same methodiP22Other elements on diagonal just can obtain community
In i, different user arrives channel information and the channel information of other intra-cell users arrival base station i of base station i.Due to channel
Information can obtain respectively, the most also eliminates the need for the pilot pollution problem.Other communities are carried out same process, utilize from
The channel information of the different user of different districtsUser k in different districts is arrived the channel letter of different base station
Breath combines and just can build matrix Bk.For using the user of other pilot tones also to do same process, thus obtain Bk(k=
1...K) matrix B is utilizedk, it is possible to use encoder F2 (F2 can be Conjugate Beforming encoder or
The encoders such as Zero-Forcing encoder) build minizone cooperative beam excipient matrix Vk.For using the use of other pilot tones
Same process is also done at family, thus obtains Vk(k=1...K)
Sending or accept data signal when, the user k in community 1 uses beam shaping matrix U for the first time1With
Beam shaping matrix V for the second timekSend or accept signal.Specifically, for the user k's in base station i to be sent to
Data signal qki, different base station 1 is multiplied by respectivelyIt is multiplied by the most againSend.Therefore base
The user k stood in i will receive the identical data signal from different base station, and carry out synthesizing thus further improve
The performance of system.And the signal that user is sent, it is also possible to use 2 times similar beam shaping precodings to be received, its
Arriving that performance also is able to promotes.Same method can be used to process other all of users.
Compared with prior art, the present invention passes through 2 pilot tones, and 2 major channel information obtain and the method for 2 beam shapings is come
Eliminate the pilot pollution problem, eliminate the pilot pollution problem based on large scale array antenna cellular communication system.It is additionally, since
Secondary pilot tone makes base station be obtained in that the channel information from other community users, therefore allows in second time wave beam forming and is
System achieves and cooperates between base station/cell, thus improves the performance of system further.Additionally, method proposed by the invention
The signal statistics such as direction of arrival do not had clear and definite demand, therefore, it is possible to apply at different wireless propagation environments
In.And for the different network architectures such as distributing antenna system, limited cooperation cell etc., the present invention can promote system effectively
System capacity.
Except using 2 pilot tones, 2 major channel information obtain and beyond the mentality of designing of 2 beam shapings, the most also start
Property propose again and second stage allow all users in same community use identical pilot tone, and by first stage ripple
Bundle excipient matrix accepts and processes secondary pilot signal, thus ensure that pilot signal is just while reducing pilot-frequency expense
Really obtain.From the point of view of simulation result, although pilot length extend to K+L from traditional K, add a little overhead,
It is contemplated that the systematic function after overhead still has lifting greatly.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1,2,3 be assume that the system of a network being made up of 7 communities under different coding device combination condition,
Different base station antenna number, little with under different received signal to noise ratio conditions (assuming that uplink and downlink signal to noise ratio is consistent) of different user number
District's spectrum efficiency.The correlation time of this system is 14 symbols, and correlation bandwidth is 14 subcarriers, and all base stations arrive user
Power identical._ wherein Ccjcj (solid line) be 2 stages all use conjugation precoding beam figuration (conjugate
Beamforming) performance in the case of, Czfzf (chain-dotted line) is to use urgent Zero-code wave beam forming (Zero-2 stages
Forcing Beamforming) in the case of performance.Ccjzf (section dotted line) is then the first stage to use conjugation, and second stage makes
By the performance in the case of urgent Zero-code wave beam forming, Czfej (pecked line) is then the first stage to use ZF, 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 accepts sending signal of base station and user is 0dB, and the number of users of each community is 10
Individual, transverse axis is antenna number, and the longitudinal axis is the actual spectrum efficiency in community.
Fig. 2 assumes that the signal to noise ratio that accepts sending signal of base station and user is 0dB, and antenna for base station number is 100, and transverse axis is
The number of users of each community, the longitudinal axis is the actual spectrum efficiency in community.
Fig. 3 assumes that antenna for base station number is 100, the number of users of each community 10, and transverse axis is the transmission of base station and user
Signal accept signal to noise ratio, the longitudinal axis is the actual spectrum efficiency in community.
Fig. 4 is implementing procedure of the present invention
Fig. 5 is the embodiment of the present invention schematic diagram that pilot tone sends for the first time
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 embodiment of the present invention second time pilot tone sends
Fig. 8 is the schematic diagram that the embodiment of the present invention obtains full Cell Channel Information
Fig. 9 is the schematic diagram that twice wave beam forming of the embodiment of the present invention transmits data
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1
Below for pilot pollution elimination side based on large scale array antenna cellular communication system proposed by the invention
Method describes in detail in conjunction with the accompanying drawings and embodiments, and the most also narration the present invention program solves the technical problem that and beneficial effect, needs
It is intended to be easy to the understanding of the present invention it is noted that describe embodiment, it is not played any restriction effect.
In order to the workflow of the inventive method and concrete effect are more clearly described, it will be assumed that a simple network
Structure, by 3 base stations in this network structure, 3 communities are constituted, and each community has 2 single-antenna subscriber.For the ease of
Explanation, it will be assumed that each base station has unlimited antenna.It is pointed out that when antenna number is infinite when, systematic function
Reach optimum, but actually used system antenna number is typically limited, therefore can bring certain performance degradation, its decay
After performance can be found out trend by Fig. 1, thus while the infinite hypothesis of the present embodiment antenna number explains, actual should
In with, in the case of limited antenna, the present invention also can reach due effect, should use unlimited antenna mainly by use-case
For convenience of explanation, under the conditions of appointing system not can only operate in this.
Step one, pilot tone sends for the first time.All users send pilot tone, and the different user in a community uses different
Pilot tone, the same pilot group of different districts multiplexing.So, as it is shown in figure 5, the user 1 in community 1 and the user 2 in community 1 make
Same pilot tone P11 is used with the user 1 in different pilot tones, the user 1 in community 1 and the user 1 in community 2 and community 3,
Indicated by the solid line, the user 2 in the user 2 in community 1 and the user 2 in community 2 and community 3 uses same pilot tone P12, uses
Pecked line represents.It can be seen that the pilot tone that user sends is except being received by this cell base station, also can be by the base station of adjacent cells
Accept, as shown in figure stage casing dotted line and chain-dotted line.
Step 2, for the first time estimating channel information.Each base station receives pilot tone, and pilot tone is multiplied by its conjugation P*Thus
To channel information.The signal being subject to such as base station 1 is, Y1=(H1 11+H1 21+H1 31)P11+(H1 12+H1 22+H1 32) P12, wherein H1 11
Refer to the user 1 channel parameter to base station 1 of community 1, H1 21Being the user 1 channel parameter to base station 1 of community 2, other can
To analogize.Base station utilizes conjugation P11 of pilot tone P11*It is multiplied by reception signal and obtains P11** Y1=(H1 11+H1 21+H1 31)P11**
P11+(H1 12+H1 22+H1 32)P11** P12, because P11 and P12 is orthogonal, therefore result is P11** Y1=(H1 11+H1 21+H1 31)=
Hc1 11.Can be seen that the channel information of the user 1 in community 1 by using the dry of the signal of same pilot tone from other communities
Disturb, form pilot pollution, Hc1 11There is the channel information estimating mistake to base station 1 for the user 1 in community 1 that is interfered.
User 2 in community 1 can use similar method to obtain with the channel parameter of the user in other communities, and they are to have to estimate
The channel information of meter mistake.
Step 3, each community uses the channel parameter of its intra-cell users obtained to use wave beam forming coded method
(method such as conjugation or ZF) realizes wave beam forming.As, for base station 1, by Hc1 11And Hc1 12Merge into matrix Hc1, and
Encoder is used to obtain wave beam formed matrix U1 (ZF U=f (Hc1)=Hc1 -1Or conjugation U=f (Hc1)=Hc1 *).Other
Base station uses identical method.Classical large scale array antenna cellular system now use U1 to receive data signal, can from Fig. 6
To find out, although base station 1 can receive and distinguish the signal (solid line or dotted line signal) from this community user respectively, but same
Time also can receive the signal (section dotted line or chain-dotted line represent) of user using same pilot from other communities, thus shape
Become interference.Owing to this interference will not disappear along with the increase of antenna number, therefore this is also regarded as the bottle of classical system
Neck place.
Step 4, secondary pilot tone sends.All users in community use identical pilot tone, and other communities use different
Pilot tone.As it is shown in fig. 7, user 1 and user 2 in community 1 use P21, indicated by the solid line, community 2 user 1 and user 2 are
Using P22, represent with section dotted line, community 3 user 1 and user 2 use P23, represent with pecked line.
Step 5, accepts and processes secondary pilot tone.The signal received is multiplied by the figuration matrix that step 3 obtains by base station,
Therefore base station can obtain respectively from user 1 and the signal of user 2.Specifically, base station 1 uses U1 to be multiplied by the two of user's transmission
Secondary pilot signal.By using U1, base station 1 produces 2 wave beams respectively, as shown in Figure 8, with fan-shaped solid line and pecked line table
Show.
Step 6, it is thus achieved that full subscriber channel parameter.Owing to using wave beam formed matrix U1, the wave beam 1 of base station 1 is (left in figure
In Shang Jiao community, fan-shaped solid line represents) receive the signal b of user 1 in acquisition community 11 11P21, from the user 1 of community 2
Signal b1 21P22 and the signal b of the user 1 from community 31 31P23, wherein b1 11It is little after a wave beam forming
The user 1 in district 1 is to the equivalent channel parameter of base station 1.Now by using P21*, P22*, P23*It is multiplied by the letter that wave beam 1 receives
Number it is able to obtain b1 11, b1 21And b1 31.By using similar method just can obtain with other communities in the wave beam 2 of community 1
Each user in each community arrives the equivalent channel parameter of all base stations.It can be seen that owing to employing single order
Wave beam pilot tone different with minizone, each user arrives multiple signals of each base station reception and can obtain the most independent
Wave beam and the linear combination of signal, same combination will not occur for the second time, and therefore system can estimate that different user arrives respectively
Reach the channel parameter of different base station, pollute without being formed.
Step 7, utilizes the equivalent channels information obtained to build secondary wave beam forming matrix V.Specifically, by first
Stage uses all equivalent channel parameters 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, uses all equivalent channel parameter group composite matrix B2 of pilot tone P12.Method for precoding is used to obtain wave beam forming square
Battle array V1 (ZF V1=f (B1)=B1-1Or conjugation V1=f (B1)=B1*), obtain B2 by same method, thus obtain
The wave beam formed matrix of the second stage of different user.
Step 8, uses the wave beam formed matrix U of first stage to each base station, and to whole Web vector graphic second stage
Wave beam formed matrix V send data, now different base station sends the data of user's request to same user (in Fig. 9
Identical line style represents, the user 2 in community 2 and the user 2 in community 3 obtain the effect of same minizone cooperation, due to line
Shape is limited, so not described in the legend out), system interference is completely eliminated, and systematic function promotes.Systems stay sends number
According to, until terminating correlation time.Whole flow process is repeated within next correlation time.
Said method is implemented based on 3 cell conditions, and in actual application, the present invention can apply and constitute in any quantity community
Network in.It is contemplated that the overhead of reality, and annoyance level, this method can be made in actual application
Certain amendment, as in the network of a super large, allows 3 or 7 communities closed on use different second order pilot tones, and for
Community farther out then can be with the two-stage pilot tone of same group of multiplexing, although so can introducing portion disturb, but due to distance relatively
Far, therefore disturb less.So method proposed by the invention may need amendment, concrete application strategy in actual applications
Depend on actual state, but the spirit that proposed of its essence or this method and principle.
The foregoing is only one embodiment of the present of invention, not in order to limit the present invention.Every the present invention's
Within spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (1)
1. a method for eliminating pilot pollution based on large scale array antenna cellular communication system, by twice pilot tone and wave beam
The method of figuration eliminates pilot pollution, it is characterized in that comprising the following steps:
Step one, pilot tone sends for the first time, and all users send pilot tone, and the different user in a community uses different leading
Frequently, the same pilot group of different districts multiplexing；
Step 2, for the first time estimating channel information, each base station receive pilot tone, and pilot tone is multiplied by its conjugation P* thus obtain letter
Road information；
Step 3, each community uses the channel parameter of its intra-cell users obtained to use wave beam forming coded method to come in fact
Existing wave beam forming；
Step 4, secondary pilot tone sends, and all users in community use identical pilot tone, and other communities use different leading
Frequently；
Step 5, accepts and processes secondary pilot tone, and the signal received is multiplied by the figuration matrix that step 3 obtains by base station, therefore
Base station can obtain respectively from user 1 and the signal of user 2；
Step 6, it is thus achieved that full subscriber channel parameter；
Step 7, utilizes the equivalent channels information obtained to build secondary wave beam forming matrix V；
Step 8, uses the wave beam formed matrix U of first stage, and the ripple to whole Web vector graphic second stage to each base station
Bundle figuration matrix V sends data, and now different base station sends the data of user's request to same user, and system interference is complete
Eliminating, systematic function promotes.
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