CN109412654A - The method of anti-pilot pollution - Google Patents
The method of anti-pilot pollution Download PDFInfo
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- CN109412654A CN109412654A CN201710691117.2A CN201710691117A CN109412654A CN 109412654 A CN109412654 A CN 109412654A CN 201710691117 A CN201710691117 A CN 201710691117A CN 109412654 A CN109412654 A CN 109412654A
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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
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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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
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
- H04B7/0421—Feedback systems utilizing implicit feedback, e.g. steered pilot signals
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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
- H04L25/024—Channel estimation channel estimation algorithms
- H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
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Abstract
The present invention provides a kind of method of anti-pilot pollution.This method comprises: base station obtains the channel estimation value between other base stations according to the pilot signal that other base stations are sent；For continuous multiple time shift pilot tone subframes, calculate the channel estimation value between the base station and user terminal, wherein, before calculating the channel estimation value between the base station and user terminal, the base station eliminates the data interference from other base stations using the channel estimation value between obtained and other base stations.Channel estimation phase of the present invention between user and base station uses interference elimination method, to significantly reduce pilot pollution, improves handling capacity to eliminate the influence of downlink data signal using the channel estimation value between the base station of acquisition.
Description
Technical field
The present invention relates to wireless communication technology field more particularly to a kind of methods of anti-pilot pollution.
Background technique
Extensive multiple-input and multiple-output (Massive Multiple-Input Multiple-Output, Massive
MIMO), also referred to as extensive multiple antennas refers to a kind of biography of the antenna number much larger than the main aerial number for servicing user of base station configuration
Defeated mechanism can reduce power consumption while effectively promoting spectrum efficiency, be expected in following 5th Generation Mobile Communication System
It plays an important role.According to the difference of transmission mechanism, Massive MIMO can be divided for time division duplex (Time Division
Duplexing, TDD) mode and frequency division duplex (Frequency Division Duplexing, FDD) mode.In fdd mode
In, uplink and downlink channel is completely different, needs individually to carry out channel estimation, causes the expense of FDD channel estimation very high.In TDD
In mode, uplink and downlink channel has reciprocity, it is only necessary to estimate that up channel is obtained with the estimated value of down channel, therefore
The Massive MIMO of tdd mode has bigger application market.
In order to obtain correct data transmission, need to obtain letter using orthogonal pilot frequency sequence in Massive mimo system
The estimated value in road.But pilot sequence length is limited by coherence time length can not accomplish long enough, there is no assurance that
The pilot frequency sequence of all users be it is mutually orthogonal, therefore, between different community can only multiplexed pilot sequence, so as to cause mesh
Mark interference of the channel estimation value of community user by the user for using same pilot sequence in neighboring community, disturbed estimation
Value further influences the transmission of uplink and downlink data, this phenomenon is referred to as pilot pollution.Pilot pollution is at limitation Massive
The main bottleneck of MIMO performance.
In the prior art, three classes method mainly is used to solve or reduce the pilot tone faced in large-scale multi-antenna system
Pollution problem:
First kind method is that pilot frequency sequence is distributed according to channel condition, and such methods assume that base station can know local channel
Information, as unit of cell, the degree that is disturbed of the service user channel quality of oneself and different pilot frequency sequences is distinguished in base station
It is ranked up or is grouped, optimized according to corresponding objective function (such as fairness, interference leakage etc.), pilot frequency sequence is pressed
Different user is distributed to according to certain rule.
Second class method is the precoding mechanism of anti-pilot pollution, and such methods assume that base station can know global big ruler
Degree decline, while having cooperation and shared ability between base station.The precoding of anti-pilot pollution by two layers of precoding group at,
In, internal layer precoding is traditional single cell precoding, is interfered between the user in cell for eliminating；Outer layer precoding according to
Large-scale fading information design interferes between remaining cell as caused by pilot pollution for eliminating.
Above-mentioned two classes method is all based on traditional parallel transmission framework, i.e., all users carry out pilot tone biography simultaneously in network
Defeated and channel estimation, then carry out data transmission simultaneously.However, in parallel transmission framework, only same type (such as pilot tone or
Person's upstream data or downlink data) signal be overlapped mutually, thus be easier to generate interference.
Third class method is in this type of method, the pilot transmission of neighboring community to be enabled to exist using time shift pilot transmission framework
It is mutually staggered on time, so that the data information of the pilot tone of target user and neighboring community generates aliasing, recycles data and lead
The progressive orthogonal property of channel of irrelevance and large-scale multi-antenna system between frequency solves data from the signal of aliasing
Signal.
Above-mentioned existing scheme, which is all based on antenna for base station number and tends to be infinitely great, ideal to be assumed and proposes.In parallel transmission
In framework (i.e. preceding two classes scheme), when antenna for base station number tends to infinity, the transmission of uplink and downlink data is only by from using identical
The interference of the user of pilot tone, and interference strength is proportional to large scale information, is proposed accordingly according to two class schemes before this conclusion
Pilot frequency sequence allocation plan or pre-coding scheme come reduce interference.However, in actual massive MIMO deployment, base station
Configurable antenna number is limited, and usually from tens to several hundred, error caused by channel estimation can cause in the data transmission
Strong inter-user interference leads to the decline of communication throughput.And in the time shift pilot transmission framework of third class method, the same day
When line number is limited, the interference between data and pilot tone being superimposed also be can not ignore, and channel estimation errors finally will lead to
The decline of communication throughput.
It is done in conclusion existing anti-pilot pollution scheme can not all significantly reduce pilot tone in finite antenna number situation
It disturbs, to reduce the handling capacity of communication system.
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, a kind of method of anti-pilot pollution is provided.
According to the first aspect of the invention, a kind of method of anti-pilot pollution is provided.This method include the following:
Step 1: base station obtains the channel estimation value between other base stations according to the pilot signal that other base stations are sent；
Step 2: for continuous multiple time shift pilot tone subframes, the channel estimation value between the base station and user terminal is calculated,
Wherein, before calculating the channel estimation value between the base station and user terminal, the base station utilizes obtained and other bases
Channel estimation value between standing eliminates the data interference from other base stations.
In one embodiment of the invention, step 1 includes:
Step 11: each base station sends pilot matrix P in a manner of poll, and the pilot matrix P meets PPH=IM,
In, IMIndicate that M ties up unit matrix, M is the antenna number of a base station；
Step 12: each base station is according to the pilot signal of the other base stations received in time span TBS_PInterior acquisition
Channel estimation value between other base stations, is expressed as
Wherein,Indicate the pilot signal that base station l is receivedIndicate that the pilot tone of base station d sends power, PHTable
Show the associate matrix of P, TBS_P=M × L, M are the antenna numbers of a base station, and L is total number of base.
In one embodiment of the invention, in a step 11, each base station is with the coherence time length of channel between base station
It repeats to send the pilot matrix for the period.
In one embodiment of the invention, step 2 includes:
Step 21: being believed according to the channel estimation value between obtained and other base stations, downlink data precoding the base station
Breath, downlink data information determine that the downlink data from other base stations interferes；
Step 22: for each of described continuous multiple time shift pilot tone subframes, the base station is from the signal received
In subtract the downlink data interference of other base stations and then calculate channel estimation value between the base station and user terminal.
In one embodiment of the invention, for each of described continuous multiple time shift pilot tone subframes, step 22
It include: when receiving the pilot tone of user terminal transmission, the base station subtracts other base stations from the signal received
Channel estimation value between the interference and then the calculating base station and user terminal of downlink data.
In one embodiment of the invention, step 22 further include: the base station is based on calculated between user terminal
Channel estimation value detect upstream data.
In one embodiment of the invention, step 22 further include: the base station be based on it is calculated with user terminal it
Between channel estimation value determine the precoding of downlink data, to send data.
In one embodiment of the invention, the downlink data precoding information and the downlink data information are by having
Line mode is shared between each base station.
In one embodiment of the invention, each base station is the base station TDD for configuring extensive multiple antennas.
According to the second aspect of the invention, a kind of communication system of anti-pilot pollution is provided.The system includes user's end
End and base station, wherein the method that the base station is used to execute anti-pilot pollution of the invention.
Compared with the prior art, the advantages of the present invention are as follows: the channel estimation phase between user and base station uses dry
The method for disturbing elimination, using the channel estimation value between the base station of acquisition, to eliminate the influence of downlink data signal, therefore,
In the case where finite antenna number, pilot pollution can be significantly reduced, to improve communication throughput.
Detailed description of the invention
The following drawings only makees schematical description and interpretation to the present invention, is not intended to limit the scope of the present invention, in which:
Fig. 1 shows the schematic diagram of transmission architecture according to an embodiment of the invention.
Fig. 2 shows the flow charts of anti-pilot pollution method according to an embodiment of the invention.
Fig. 3 shows the channel estimation errors comparison diagram of method and method in the prior art of the invention.
Fig. 4 is shown in the case where different base station antenna number, the frequency of method of the invention and method in the prior art
Spectrum efficiency comparison diagram.
Specific embodiment
It is logical below in conjunction with attached drawing in order to keep the purpose of the present invention, technical solution, design method and advantage more clear
Crossing specific embodiment, the present invention is described in more detail.It should be appreciated that specific embodiment described herein is only to explain
The present invention is not intended to limit the present invention.
Fig. 1 illustrates the network being made of three cells to describe transmission architecture proposed by the present invention, and the transmission architecture is fixed
Justice carries out the channel estimation between channel estimation, base station and user between base station and the sequential relationship of data transmission.Its
In, TBSIt is time cycle, TBS_PIndicate the time span for channel estimation between base station, TcIndicate a time shift pilot transmission
The time span of subframe, each TcBy for channel estimation value between calculation base station and user's (or user terminal or terminal)
Time span τP, for the time span T of downlink data transmissiondWith the time span T detected for upstream datauComposition.Every
A TBSPeriod may include one or more time shift pilot transmission subframes (as shown in the lower half portion of Fig. 1), and three cells are in mistake
Channel between the time Estimate opened and user.
It should be appreciated that Fig. 1 only diagrammatically illustrates transmission architecture of the invention, it is not intended to limit the present invention, this field
Technical staff can according to network dispose actual needs, be arranged reasonable time parameter, for example, setting cycle TBS, be used for
The time span T of channel estimation between base stationBS_P, for data transmission time span TdDeng in addition it is also possible to using non-week
The transmission architecture of phase, for example, just triggering transmission architecture of the invention only when needing to carry out pilot pollution elimination.
Compared with the existing technology, effect of the invention is that: 1), in transmission architecture proposed by the present invention, increase use
In the time span T for carrying out channel estimation between base stationBS_P, within the time period, the channel carried out between base station and base station is estimated
Meter；2) channel estimation, being applied to the channel estimation value between the base station of acquisition and base station between subsequent base station and user
Interference in the process is eliminated, and in this way, can be improved the precision of the channel estimation value between base station and user, to drop
Low pilot pollution.
Fig. 2 shows the method flow diagrams of the anti-pilot pollution under the transmission architecture of Fig. 1.
It should be noted that, in this document, cell refers to the coverage area of base station, it is the concept of logic, base station is to be used for
The physical entity of accessing user, phrase " some base station of cell " refer to the base station of coverage cell.Therefore, following description
In, in some cases, cell is equal to base station.
Step 1: determining the channel estimation value between base station
In the wireless communication system being made of multiple base stations (or cell) L, if the base station deployment M root day of each cell
Line, each cell provide data transport service for K user.
In conjunction with Fig. 1, in each cycle TBSThe T of beginningBS_PIn time span, channel estimation between base station, each base station are carried out
Pilot matrix P can be sent in a manner of poll, pilot matrix P meets orthogonality condition, i.e. PPH=IM, PHIt is the conjugate transposition of P
Matrix, IMIndicate that M ties up unit matrix, M is antenna for base station number, and each base station passes through the pilot tone letter from other base stations received
Number channel estimation value between calculation base station and other base stations.(unit is one to the occupied total time length of channel estimation between base station
A OFDM symbol) be total number of base L and each antenna for base station number M product, i.e. TBS_P=M × L symbol.
Specifically, the base station transmission of cell d is for when the pilot matrix P of channel estimation, what base station l was received to be led between base station
Frequency signalIt may be expressed as:
Wherein,Indicate that the pilot tone of base station d sends power, gldIndicate the channel between base station l and base station d,It indicates
Noise during this.
Base station l is according to receiving pilot signalCalculate its own channel estimation between the d of base stationIt obtains:
Wherein, PHIndicate the associate matrix of P.
It is above-mentioned that the side for carrying out channel estimation between base station is described so that base station d sends pilot tone, base station l receives pilot tone as an example
Method, in this way, all base stations can obtain its own channel estimation between other adjacent base stations.
Step 2: utilizing the letter between the base station of acquisition during determining the channel estimation value between base station and user
Road estimated value carries out successive interference cancellation.
Still with Fig. 1, in TBS_PLater, followed by continuous multiple time shift pilot tone subframes, until the cycle TBSTerminate.?
In time shift pilot tone subframe, different community sends ascending pilot frequency by user on the time being staggered, and base station is according to the user received
Pilot signal calculates the channel estimation value between user and base station, between a cell carries out user when channel estimation,
Its cell carries out downlink data transmission.By taking Fig. 1 as an example, cell 1 carries out the channel estimation between user and base station first, at this point,
Transmit downlink data in the base station of cell 2 and cell 3；After the channel estimation that cell 1 completes between user, carried out by cell 2
Channel estimation between user, at this point, cell 1 and cell 3 transmit downlink data；Until all cells are completed and corresponding user
Between channel estimation.
Base station is during carrying out the channel estimation between user and base station, between the base station using first step acquisition
Channel estimation value carries out successive interference cancellation.In short, before channel estimation of the base station between progress user and base station, according to
It is dry that channel estimation value between the base station and base station of acquisition cuts the downlink data from other base stations from the signal received
It disturbs, wherein the downlink data interference can be according to the precoding information of channel estimation value, downlink data between base station and base station
It is obtained with solutions such as downlink data information.
Specifically, when the user of base station l transmits pilot tone, signal y that base station l is receivedlAre as follows:
Where it is assumed that there be K user in each base station, supplied in network comprising L base station,Indicate the kth of first of base station
A user sends the power of ascending pilot frequency, gllkIndicate the channel between k-th of user of first of base station and base station l, ψkIt indicates
The pilot tone of k-th of user of first of base station,Indicate that base station d is used to send the power of downlink data, gldIndicate base station l and base
The channel stood between d, wdcIndicate the precoding vector that c-th of user that base station d services it generates,Indicate that base station d is sent
To the data of its c-th of user, nlIndicate additive noise.In one embodiment, each base station services it user's generation
Precoding information and the downlink data information of transmission can be shared between the base stations by wired mode.
Next, according between the base station obtained between channel estimation and base station share downlink data precoding information,
Downlink data information, base station l subtract the downlink data interference from other base stations first, obtain
Then, it is based onObtain the kth of base station l ' channel estimation between a user and base station l
Wherein, subscript H indicates conjugate transposition operation, i.e.,Indicate the conjugate transposition of kth ' a user's pilot frequency sequence, τpTable
Show that user sends the time span of pilot frequency sequence,Indicating the kth of first of base station ' a user sends the power of ascending pilot frequency.
By the above method, the channel estimation between all users and its serving BS can be obtained.For TBSIn period
Multiple time shift pilot tone subframes, before carrying out the channel estimation between user and base station every time, can be connected using the above process
The interference of downlink data is eliminated continuously, to obtain the user based on successive interference cancellation and the channel estimation value between base station.
In this way, the precision that can effectively improve the channel estimation value between user and base station, this is because being connect in base station
In the signal received, for example, in τPIn time span, aliasing two kinds of signals, including by channel between user and the base station
Pilot signal and downlink data signal by channel between other base stations and the base station do not have and in the prior art
Consider interference caused by downlink data signal, therefore, in carrying out the channel estimation process between user and base station, does not also have
The measure of effectively eliminating is taken to such interference.
In one embodiment, TBSPeriod is set as the channel coherency time length between base station, and (channel is kept i.e. between base station
Constant time span), for different base station deployment scenes, which can be by testing or emulating acquisition, for example, setting
42000 symbols are set to, since the channel between base station is more stable relative to the channel between user and base station, very long one
It is remained unchanged in the section time, therefore, the channel estimation value between first step base station obtained can be in subsequent multiple continuous use
Family grade coherence time uses, to ensure that the resource overhead for channel estimation between base station is not too large.
Step 3: uplink and downlink data are transmitted.
After completing the channel estimation between user and base station, the new channel estimation value based on successive interference cancellation is used
(for example,) Lai Shengcheng pre-coding matrix, to transmit downlink data.When all cells complete the channel estimation between user and base station
Later, while downlink data transmission is carried out, terminated until the downlink data transmission time.
In the transmitting uplink data stage, user's simultaneous transmission upstream data of all cells, for tdd mode, based on upper
The reciprocity of down channel, base station are estimated using the channel between the user based on successive interference cancellation obtained in this subframe and base station
Evaluation (for example,) signal detection matrix is generated, to detect upstream data.
The method of transmission architecture and anti-pilot pollution of the invention, can be applied in the communication system of such as tdd mode,
To improve the precision of channel estimation, Pilot Interference is reduced, is particularly suitable for the base station of configuration massive MIMO.
Although method proposed by the present invention, need to carry out the channel estimation between base station using additional resource, by setting
Set T appropriateBSPeriod selects the power, different base station of channel estimation between optimal base station using orthogonal guide frequency etc., can be not
In the case where influencing throughput of system, Pilot Interference is reduced, to improve the spectrum efficiency of base station.Of the invention have to verify
Effect property, inventor are respectively adopted anti-pilot pollution method and existing method provided by the invention and are emulated, simulation parameter ginseng
See the table below 1, wherein the channel between base station, base station and its to service the Channel Modeling between user be by large-scale fading and small
Scale decline wireless channel dimerous.
Table 1: simulation parameter
Fig. 3 passes through normalization mean square channel evaluated error (normalized square channel estimation
Error, NSCEE) cumulative distribution function curve (CDF) come describe the prior art 1 (parallel transmission framework), the prior art 2 (when
Move pilot transmission framework) and the method for the present invention precision of channel estimation, wherein normalization mean square channel evaluated error define such as
Under:
The imitative really antenna for base station of Fig. 3 it is several 128 the case where, normalize the smaller expression channel estimation of mean square channel evaluated error
It is more accurate, it can be seen that time shift pilot transmission framework and parallel transmission framework in compared with the prior art, it is proposed by the present invention
Transmission architecture and the normalized mean squared error of the channel estimation based on SIC can obtain the gain of 11.3dB and 13.4dB respectively.
Therefore, when antenna number is limited, scheme proposed by the present invention can obtain more accurate channel estimation.
Fig. 4 compared two kinds of transmission architectures in the prior art and transmission architecture of the invention in different base station antenna number
Downstream spectrum efficiency and uplink spectrum efficiency, wherein abscissa is antenna number, and ordinate is downstream spectrum efficiency (Fig. 4 (a))
With upstream frequency efficiency (Fig. 4 (b)).From fig. 4, it can be seen that during antenna for base station number increases to 1024 from 8, the present invention
The spectrum efficiency of the transmission architecture of proposition is higher than the two schemes of the prior art always, and effect is more when antenna number is less
It is significant.With the deployment of typical massive mimo antenna, for configuring 128 antennas, in the performance of downstream spectrum efficiency,
Framework proposed by the present invention is higher than time shift pilot transmission framework (prior art 2) and parallel transmission framework (prior art 1) respectively
0.7bps/Hz and 1.5bps/Hz out, gain are respectively 30% and 100%；In the performance of uplink spectrum efficiency, the present invention is mentioned
Transmission architecture out is higher by 0.4bps/Hz and 0.55bps/Hz than the prior art 2 and the prior art 1 respectively, and gain has respectively
31% and 50%.Therefore, when antenna number is less than 1024, scheme proposed by the present invention can obtain higher spectrum efficiency, and
At antenna for base station number less (for example, being less than 200), effect is more significant.
Anti- pilot pollution method proposed by the present invention and transmission architecture can be applied in the base station TDD, big for being configured with
The base station of scale antenna, the effect that spectrum efficiency is turned up are more obvious.
It should be noted that, although each step is described according to particular order above, it is not intended that must press
Each step is executed according to above-mentioned particular order, in fact, some in these steps can concurrently execute, or even is changed suitable
Sequence, as long as can be realized required function.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.The selection of term used herein, purport
In principle, the practical application or to the technological improvement in market for best explaining each embodiment, or make the art its
Its those of ordinary skill can understand each embodiment disclosed herein.
Claims (10)
1. a kind of method of anti-pilot pollution, comprising the following steps:
Step 1: base station obtains the channel estimation value between other base stations according to the pilot signal that other base stations are sent；
Step 2: for continuous multiple time shift pilot tone subframes, calculating the channel estimation value between the base station and user terminal, wherein
Before calculating the channel estimation value between the base station and user terminal, the base station is using between obtained and other base stations
Channel estimation value come eliminate from other base stations data interference.
2. according to the method described in claim 1, wherein, step 1 includes:
Step 11: each base station sends pilot matrix P in a manner of poll, and the pilot matrix P meets PPH=IM, wherein
IMIndicate that M ties up unit matrix, M is the antenna number of a base station；
Step 12: each base station is according to the pilot signal of the other base stations received in time span TBS_PIt is interior acquisition and its
Channel estimation value between its base station, is expressed as
Wherein,Indicate the pilot signal that base station l is received Indicate that the pilot tone of base station d sends power, PHIndicate being total to for P
Yoke transposed matrix, TBS_P=M × L, M are the antenna numbers of a base station, and L is total number of base.
3. according to the method described in claim 2, wherein, in a step 11, each base station is with the coherence time of channel between base station
Length is to repeat in the period to send the pilot matrix.
4. according to the method described in claim 1, wherein, step 2 includes:
Step 21: the base station according between obtained and other base stations channel estimation value, downlink data precoding information, under
Row data information determines that the downlink data from other base stations interferes；
Step 22: for each of described continuous multiple time shift pilot tone subframes, the base station subtracts from the signal received
The downlink data of other base stations is gone to interfere and then calculate the channel estimation value between the base station and user terminal.
5. according to the method described in claim 4, wherein, for each of described continuous multiple time shift pilot tone subframes, walking
Rapid 22 include:
When receiving the pilot tone of user terminal transmission, the base station in the signal received from subtracting under other base stations
Channel estimation value between the interference and then the calculating base station and user terminal of row data.
6. according to the method described in claim 4, step 22 further include:
The base station upstream data is detected based on the channel estimation value calculated between user terminal.
7. according to the method described in claim 4, step 22 further include:
The base station determines the precoding of downlink data based on the channel estimation value calculated between user terminal, with hair
Send data.
8. according to the method described in claim 4, wherein, the downlink data precoding information and the downlink data information are logical
Wired mode is crossed to share between each base station.
9. method according to any one of claim 1 to 8, wherein each base station is the TDD base for configuring extensive multiple antennas
It stands.
10. a kind of communication system of anti-pilot pollution, including user terminal and base station, wherein the base station is for executing basis
Method described in any one of claims 1 to 9.
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