CN106713189B - Uplink channel estimation method, pilot signal transmission method and base station - Google Patents
Uplink channel estimation method, pilot signal transmission method and base station Download PDFInfo
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- CN106713189B CN106713189B CN201610539194.1A CN201610539194A CN106713189B CN 106713189 B CN106713189 B CN 106713189B CN 201610539194 A CN201610539194 A CN 201610539194A CN 106713189 B CN106713189 B CN 106713189B
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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
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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
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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
Abstract
A kind of uplink channel estimation method, pilot signal transmission method and base station, the uplink channel estimation method include: for target UE collocating uplink pilot resources, and the target UE is located in predeterminable area；The pilot signal of user equipment in the predeterminable area is received, and calculates separately the uplink channel estimation value of user equipment in the predeterminable area；Based on the uplink channel estimation value of the user equipment of predetermined number in the predeterminable area, the long term channel characteristics parameter of the target UE up channel is estimated；According to the long term channel characteristics parameter of the target UE up channel, the ascending pilot frequency resource of the target UE is reconfigured；The pilot signal of the target UE is received, and transient channel estimation is carried out to the up channel of the target UE, using estimated result as the uplink channel estimation value of the target UE.Channel estimation quality can be improved using the above scheme.
Description
Technical field
The present invention relates to wireless communication technology field more particularly to a kind of uplink channel estimation methods, pilot signal transmission
Method and base station.
Background technique
It is sent data on the up direction of base station, the hair of each UE by user equipment (User Equipment, UE)
It send resource to be distributed unitedly by base station to control.Base station needs to be known in advance the channel quality status of UE, to determine which frequency band is suitable for
UE transmission, which frequency band need to avoid as far as possible.When changing different when the channel fading in system on up-downlink direction, such as one
A FDD system needs UE to send reference signal known to a receiving end, referred to as visits to obtain uplink signal-channel quality information
It surveys reference signal (Sounding Reference Signal, SRS), or is detecting pilot frequency signal, be a kind of ascending pilot frequency letter
Number, which covers a wider frequency range, is able to reflect the fading status of the wireless channel in the frequency range.Base station
The SRS sent using each UE, carries out the assessment of channel quality.
In a kind of existing LTE communication system, the SRS orthogonal with the UE of same cell that base station is sent based on target UE, into
Row channel estimation.However, this will lead to limitation of the promotion of SRS capacity by coherence bandwidth and coherence time.
For promoted SRS capacity, it is existing another kind uplink channel estimation scheme propose, base station sent based on target UE with
With the non-orthogonal SRS of cell UE, channel estimation is carried out.It is mutually done however, the SRS that this mode UE is respectively sent to base station exists
It disturbs, and then influences the precision of uplink channel estimation.
Summary of the invention
The technical issues of embodiment of the present invention solves is how to promote the precision of uplink channel estimation, improves channel estimation matter
Amount.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of method that base station carries out uplink channel estimation, institute
The method of stating includes: for target UE collocating uplink pilot resources, and the target UE is located in predeterminable area；It receives
The pilot signal of user equipment in the predeterminable area, and the up channel for calculating separately user equipment in the predeterminable area is estimated
Evaluation；Based on the uplink channel estimation value of the user equipment of predetermined number in the predeterminable area, estimate that the target user sets
The long term channel characteristics parameter of standby up channel；According to the long term channel characteristics parameter of the target UE up channel,
Reconfigure the ascending pilot frequency resource of the target UE；The pilot signal of the target UE is received, and to institute
The up channel for stating target UE carries out transient channel estimation, using estimated result as the uplink of the target UE
Channel estimation value.
Optionally, the predeterminable area is the base station institute coverage cell or for comprising base station institute coverage cell
Multiple cells.
Optionally, described is target UE collocating uplink pilot resources, comprising: is configured for the target UE
The ascending pilot frequency resource orthogonal with other users equipment in the predeterminable area.
Optionally, the long term channel characteristics parameter of the target UE up channel, comprising: the target user sets
The channel strength of standby relative position parameter or the corresponding up channel of the target UE, the relative position parameter
For determining relative position region of the user equipment with respect to base station.
Optionally, the relative position parameter of the target UE includes: the up channel of the target UE
Center angle of arrival and up channel angle spread.
Optionally, the uplink channel estimation value based on the user equipment of predetermined number in the predeterminable area, described in estimation
The long term channel characteristics parameter of target UE up channel, comprising: to the uplink channel estimation of the target UE
Value carries out Fourier transform and obtains its angle domain estimated value；Calculate the up channel angle domain estimated value of the target UE
Mould mean value of square；By the maximum element institute of the mould mean value of square of the up channel angle domain estimated value of the target UE
Up channel center angle-of- arrival estimation value of the angle as the target UE；According to the decaying of opposite center gain
Value, calculates the up channel angle spread estimated value of the target UE.
Optionally, the long term channel characteristics according to the target UE reconfigure the target user and set
Standby ascending pilot frequency resource, comprising: when other use in the relative position region of the target UE and the predeterminable area
When there is intersection in the relative position region of family equipment, the orthogonal with other users equipment of the target UE configuration is remained
Ascending pilot frequency resource is constant.
Optionally, the long term channel characteristics according to the target UE reconfigure the target user and set
Standby ascending pilot frequency resource, comprising: when other use in the relative position region of the target UE and the predeterminable area
When there is intersection in the relative position region of family equipment, reconfigured for the target UE orthogonal with other users equipment upper
Row pilot resources.
Optionally, the long term channel characteristics according to the target UE reconfigure the target user and set
Standby ascending pilot frequency resource, comprising: when other use in the relative position region of the target UE and the predeterminable area
When the relative position region of family equipment is without intersection, set for target UE distribution with other users in the predeterminable area
Standby non-orthogonal ascending pilot frequency resource.
Optionally, described is that target UE distribution is non-orthogonal with other users equipment in the predeterminable area
Ascending pilot frequency resource, comprising: distributed for the target UE from the other users equipment in the predeterminable area different
Virtual subdistrict mark is to generate the random sequence work with the other users equipment degree of correlation in the predeterminable area lower than preset threshold
For the ascending pilot frequency resource of the target UE.
Optionally, the pilot signal for receiving the target UE, and to the uplink of the target UE
Channel carries out transient channel estimation, comprising: carries out wink using up channel of the space filtering mode to the target UE
When channel estimation.
Optionally, just using other users equipment in the transmission frame transmission of the first pilot signal density and the predeterminable area
The pilot signal of friendship；It is non-just using the transmission frame transmission of the second pilot signal density and other users equipment in the predeterminable area
The pilot signal of friendship；First pilot signal density is greater than second pilot signal density.
Optionally, when the predeterminable area is comprising multiple cell of base station institute coverage cell, different community
Base station obtains the ascending pilot frequency resource of the user equipment of other cells by way of communicating back, and small based on itself covering
The ascending pilot frequency resource of the user equipment in area and the ascending pilot frequency resource of other cell user equipments, to the target UE
Ascending pilot frequency resource configured.
Optionally, the base station is configured with linear array antenna or planar array.
Optionally, the pilot signal is detecting pilot frequency signal.
The embodiment of the invention also provides a kind of pilot signal transmission methods, which comprises is transmitted using the first kind
Frame transmits mutually orthogonal pilot signal；Non-orthogonal pilot signal is transmitted using the second class transmission frame；The first kind transmission
The density of pilot signal is greater than the density of pilot signal in the second class transmission frame in frame.
Optionally, the transmission cycle of the first kind transmission frame is greater than the transmission cycle of the second class transmission frame.
Optionally, the pilot signal is detecting pilot frequency signal.
To solve the above problems, the base station includes: the first configuration list the embodiment of the invention also provides a kind of base station
Member, is suitable for target UE collocating uplink pilot resources, and the target UE is located in predeterminable area；First receives
Unit, suitable for receiving the pilot signal of user equipment in the predeterminable area；First estimation unit, suitable for based on the institute received
The pilot signal for stating user equipment in predeterminable area calculates separately the uplink channel estimation of user equipment in the predeterminable area
Value；Second estimation unit, suitable for the uplink channel estimation value based on the user equipment of predetermined number in the predeterminable area, estimation
The long term channel characteristics parameter of the target UE up channel；Second configuration unit is suitable for based on second estimation
The long term channel characteristics parameter for the target UE up channel that unit estimation obtains, configures the target UE
Ascending pilot frequency resource；Second receiving unit, suitable for the target UE after reception second configuration of described dispensing unit
Pilot signal；Third estimation unit, suitable for the pilot signal received based on second receiving unit, to the target user
The up channel of equipment carries out transient channel estimation, using estimated result as the uplink channel estimation of the target UE
Value.
Optionally, the predeterminable area is the base station institute coverage cell or for comprising base station institute coverage cell
Multiple cells.
Optionally, first configuration unit, be suitable for target UE configuration in the predeterminable area its
The orthogonal ascending pilot frequency resource of his user equipment.
Optionally, the long term channel characteristics parameter of the target UE up channel, comprising: the target user sets
The channel strength of standby relative position parameter or the corresponding up channel of the target UE, the relative position parameter
For determining relative position region of the user equipment with respect to base station.
Optionally, the relative position parameter of the target UE includes: the up channel of the target UE
Center angle of arrival and up channel angle spread.
Optionally, second estimation unit includes: angle domain estimation subelement, suitable for the target UE
Uplink channel estimation value carries out Fourier transform and obtains its angle domain estimated value；Mean value computation subelement is suitable for calculating the mesh
Mark the mould mean value of square of the up channel angle domain estimated value of user equipment；Angle-of- arrival estimation subelement is suitable for the target
Angle where the maximum element of mould mean value of square of the up channel angle domain estimated value of user equipment is used as the target
The up channel center angle-of- arrival estimation value of family equipment；Angle spread estimates subelement, suitable for declining according to opposite center gain
Depreciation calculates the up channel angle spread estimated value of the target UE.
Optionally, second configuration unit, including following at least one of: the first configuration subelement is suitable for described
When there is intersection in the relative position region of other users equipment in the relative position region of target UE and the predeterminable area,
The ascending pilot frequency resource orthogonal with other users equipment for remaining the target UE configuration is constant, or is the target
User equipment reconfigures the ascending pilot frequency resource orthogonal with other users equipment；Second configuration subelement, is suitable for working as the mesh
When marking the relative position region of other users equipment in the relative position region and the predeterminable area of user equipment without intersection, it is
The target UE distribution and the non-orthogonal ascending pilot frequency resource of other users equipment in the predeterminable area.
Optionally, the second configuration subelement, is suitable for its in the target UE and the predeterminable area
His user equipment distributes different virtual subdistrict marks and is lower than with generating with the other users equipment degree of correlation in the predeterminable area
Ascending pilot frequency resource of the random sequence of preset threshold as the target UE.
Optionally, the third estimation unit is suitable for believing using uplink of the space filtering mode to the target UE
Road carries out transient channel estimation.
Optionally, the base station is configured with linear array antenna or planar array.
Optionally, the pilot signal is detecting pilot frequency signal.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
Above-mentioned uplink channel estimation method is not the primary instantaneous estimation value to the up channel of target UE, and
It is the uplink channel estimation value first based on the user equipment of predetermined number in the predeterminable area, estimates the target UE
The long term channel characteristics parameter of up channel, and according to the long term channel characteristics parameter, it reconfigures the target user and sets
Standby ascending pilot frequency resource, and the pilot signal of the target UE is received, the uplink of the target UE is believed
Road carries out transient channel estimation, using estimated result as the uplink channel estimation value of the target UE, therefore estimates knot
Fruit can be more accurate, therefore can be improved channel estimation quality.
Further, since the estimation method is suitable for multiple cells namely above-mentioned uplink channel estimation method can
In view of the ascending pilot frequency resource of peripheral cell is to the disturbed condition of the up channel of target UE in jurisdiction district, therefore can
To further increase precision of channel estimation, the especially user equipment to cell intersection.
Further, firstly, being set by being first target UE configuration with other users in the predeterminable area
Standby orthogonal ascending pilot frequency resource, it is possible to reduce the interference between pilot signal guarantees uplink channel estimation precision, basic herein
On, based on the uplink channel estimation value of the user equipment of predetermined number in the predeterminable area, estimate the target UE
The long term channel characteristics parameter of up channel, and according to the long term channel characteristics parameter, it is again the target UE
Orthogonal or non-orthogonal ascending pilot frequency resource is configured, Signal to Interference plus Noise Ratio is improved, can be further improved channel estimation quality.And according to
The long term channel characteristics parameter, configuring non-orthogonal ascending pilot frequency resource again for the target UE can also avoid
The pilot signal number is limited by coherence bandwidth and coherence time, improves the capacity of pilot resources.
Further, it is set by calculating the relative position parameter for obtaining the target UE or the target user
The channel strength of standby corresponding up channel, can reflect the long term channel characteristics of the target UE, therefore can be improved
The quality of channel estimation.
Further, by for the target UE it is different from the other users equipment distribution in the predeterminable area
Virtual subdistrict mark, it can generate with the other users equipment degree of correlation in the predeterminable area be lower than preset threshold it is random
Ascending pilot frequency resource of the sequence as the target UE, so as to reduce the interference between other pilot signals,
Improve channel estimation quality.
Pilot signal in the pilot signal transmission frame that base station passes through high pilot signal density obtains the target user and sets
The standby preliminary estimated information of up channel obtains the target user by the pilot signal transmission frame of low pilot signal density and sets
The estimated information of standby up channel opposite fine, can save transfer resource while improving channel estimation quality.
Detailed description of the invention
Fig. 1 is a kind of method flow diagram of base station progress uplink channel estimation in the embodiment of the present invention；
Fig. 2 is the method flow diagram that another base station carries out uplink channel estimation in the embodiment of the present invention；
Fig. 3 is a kind of architecture of base station schematic diagram in the embodiment of the present invention.
Specific embodiment
For convenience of description, to UE corresponding to estimated up channel, referred to as target UE.
As previously mentioned, existing channel estimation methods, based on the SRS orthogonal with other UE in cell that target UE is sent,
Or based on target UE send with the non-orthogonal SRS of other UE in cell, be all based on target UE transmission a SRS signal
It obtains, and can also be interfered with each other with the non-orthogonal SRS of other UE in cell, will affect the essence of the estimation to target UE up channel
Degree, causes to estimate of low quality.
In view of the above-mentioned problems, the embodiment of the present invention for the target UE in predeterminable area, is based in the predeterminable area in advance
If the channel estimation value of the pilot signal of the UE of number, the long term channel characteristics parameter of the target UE up channel is estimated, and
According to the long term channel characteristics parameter, the ascending pilot frequency resource of the UE is reconfigured, and receives the target UE
Pilot signal, transient channel estimation is carried out to the up channel of the target UE, using estimated result as the target UE's
Uplink channel estimation value, therefore estimated result can be more accurate, therefore can be improved channel estimation quality.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to this
The specific embodiment of invention is described in detail.
The embodiment of the invention provides a kind of methods that base station carries out uplink channel estimation, by detecting pilot frequency signal
(SRS) uplink channel estimation is carried out.It is described in detail referring to Fig. 1, and by specific steps.
S101, is target UE collocating uplink pilot resources, and the target UE is located in predeterminable area.
In specific implementation, the predeterminable area can be base station institute coverage cell, or include the base
It stands multiple cells of institute coverage cell.
In an embodiment of the present invention, to avoid signal interference, base station is target UE configuration and the predeterminable area
Other interior UE orthogonal ascending pilot frequency resource.It in an alternative embodiment of the invention, is promotion signal capacity, base station is the target
UE configuration and the non-orthogonal ascending pilot frequency resource of other UE in the predeterminable area.
S102, receives the SRS of UE in the predeterminable area, and the up channel for calculating separately UE in the predeterminable area is estimated
Evaluation.
It in specific implementation, can be right respectively by the way of many algorithms such as least square method (Least-squared)
The uplink channel estimation value of each UE in predeterminable area.
S103 estimates the target user based on the uplink channel estimation value of the UE of predetermined number in the predeterminable area
The long term channel characteristics parameter of equipment up channel.
In an embodiment of the present invention, using the relative position parameter of the target UE as the target UE uplink
The long term channel characteristics parameter of channel, relative position parameter can be used to confirm that relative position region.Pass through relative position parameter
It can determine relative position region of the user equipment with respect to base station.In specific implementation, the relative position of the target UE
Parameter may include: the center angle of arrival and up channel angle spread of the up channel for stating target UE.
In an alternative embodiment of the invention, using the channel strength of the corresponding up channel of the target UE as the target
The long term channel characteristics parameter of UE up channel.In a particular embodiment, the channel by the up channel of the target UE is strong
Degree, the relative position of combining target UE, it can be determined that may be present between target UE to interfere with each other.
It is understood that in specific implementation, the target UE up channel can also can be characterized using others
Long term channel characteristics long term channel characteristics parameter of the parameter as the UE up channel.
S104 reconfigures the ascending pilot frequency money of the target UE according to the long term channel characteristics parameter of the target UE
Source.
It in specific implementation, can be that the target UE configures different ascending pilot frequency resources according to different situations.
For example, when before for the target UE configuration be orthogonal ascending pilot frequency resource when, if the phase of the target UE
To the relative position region of other UE in the band of position and the predeterminable area without intersection, to extend ascending pilot frequency resource capacity,
It can be again target UE distribution and the non-orthogonal ascending pilot frequency resource of other UE in the predeterminable area.
In another embodiment, equally, before for the target UE configuration be orthogonal ascending pilot frequency resource when, if institute
When stating the relative position region of other UE in the relative position region and the predeterminable area of target UE has intersection, to avoid signal
Interference can reconfigure the ascending pilot frequency resource orthogonal with other users equipment, namely configuration for the target UE
From orthogonal ascending pilot frequency resources different before；To avoid signal interference, the ascending pilot frequency that can also be configured before is provided
Source is constant, that is, the ascending pilot frequency resource orthogonal with other UE for remaining the target UE configuration is constant.
Similarly, if being before that non-orthogonal ascending pilot frequency resource as needed can also for target UE configuration
To be again that the UE configures corresponding ascending pilot frequency resource, repeat no more.
S105 receives the SRS of the target UE, and carries out transient channel estimation to the up channel of the target UE, will
Uplink channel estimation value of the estimated result as the target UE.
As can be seen from the above embodiments, it is primarily based on the uplink channel estimation of the UE of predetermined number in the predeterminable area
Value, estimates the long term channel characteristics parameter of the target UE up channel, further according to the long term channel characteristics parameter, matches again
The ascending pilot frequency resource of the target UE is set, and receives the pilot signal of the target UE again, to the uplink of the target UE
Channel carries out transient channel estimation, using estimated result as the uplink channel estimation value of the target UE.In this process
In, first according to the uplink channel estimation value of the UE of predetermined number in the predeterminable area, estimate the target UE uplink
The long term channel characteristics parameter of channel, therefore can reflect the long-term characteristic of the UE up channel, and reconfigure institute accordingly
It states the ascending pilot frequency resource of target UE and estimates to obtain the uplink channel estimation value of the target UE again, therefore can be to avoid one
Inaccuracy problem caused by secondary measurement improves the accuracy and estimation quality of uplink channel estimation.
To more fully understand those skilled in the art and realizing the embodiment of the present invention, below by way of more application scenarios
It is described in detail.
For example, there is the base station BS 0 of a cell, it is mounted with the linear array of M root antenna composition, has in the cell covered
Two UE:UE 0 and UE 1, BS0 needs carry out UE0 and UE1 according to the pilot signal SRS 0 and SRS 1 of UE 0 and UE 1
Row channel estimation can use following estimation method, referring to Fig. 2, the specific steps are as follows:
Whole process can be divided into the following three stage:
Stage 1: channel estimation, including step S21~S23 are carried out based on orthogonal SRS.
Mutually orthogonal ascending pilot frequency resource is respectively configured for UE 0, the pilot signal SRS 0 of UE 1, SRS 1 in S201.
S202, UE 0, UE1 are respectively according to the ascending pilot frequency resource distribution pilot signal SRS 0 configured and SRS of BS 0
1。
S203, BS 0 receives the SRS orthogonal with other UE that UE is sent in cell.
In specific implementation, the SRS orthogonal with other UE in cell can be transmitted using first kind transmission frame.Described first
The density of pilot signal is greater than preset first pilot signal density threshold value in class transmission frame.
Pilot signal received by BS 0 can indicate are as follows:
Y=h0s0+h1s1 (1)
Wherein, y indicates the pilot signal that BS 0 is received, h0With h1Indicate the up channel of UE0 and UE 1, s0With s1Table
Show SRS 0 and SRS 1.
In specific implementation, it is contemplated that the additive noise of 0 receiving end BS, pilot signal received by BS 0 can be with table
It is shown as:
Y=h0s0+h1s1+n (2)
Wherein, y indicates the received uplink pilot signal of BS 0, h0With h1Indicate the up channel of UE0 and UE 1, s0With s1
Indicate that SRS 0 and SRS 1, n indicate the receiving end additive noise of BS 0.
s0With s1It is mutually orthogonal, meet following relationship:
S204, BS 0 is believed based on uplink of the SRS 0 and SRS1 known to the SRS and base station side received to UE 0 and UE 1
Road carries out channel estimation.
In an embodiment of the present invention, BS 0 carries out channel estimation using least square method:
From formula (5) and formula (6) it is found that due to orthogonal, h0Estimated value in there is no come from s1Interference, h1Estimation
In value also not from s0Interference.
Stage 2: the long term channel characteristics parameter of estimation target UE up channel, and reconfigure the ascending pilot frequency of target UE
Resource, including step S205~S207.
In an embodiment of the present invention, BS 0 estimates the relative position parameter of target UE, specific as follows:
The uplink channel estimation value that S205, BS 0 is obtained according to L based on orthogonal SRS, to the opposite position of corresponding UE
Set carry out rough estimate.
In an embodiment of the present invention, the relative position parameter of the UE includes center angle of arrival and the angle of UE up channel
Degree extension.
Firstly, for convenience of description, with UEk indicate above-mentioned L mutually orthogonal SRS corresponding to be identified as k's in UE
UE the center angle of arrival to UEk up channel and angle spread can estimate with the following method:
1) what is obtained to the estimation method using step S204 has the up channel of communication link with the base station BS 0
Estimated value M × 1It does Fourier transform and obtains its angle domain form:
Wherein,Indicate first of uplink channel estimation value based on orthogonal SRS of UEk.
2) the mould mean value of square of up channel angle domain estimation is calculated
3) by the up channel center angle-of- arrival estimation value of UEkIt is set toThe angle being worth where maximum element, it may be assumed that
4) according to the pad value of opposite center gain, it is calculated using the following equation the up channel angle spread estimation of UEk
Value δk:
Wherein, λ is attenuation coefficient, and the value of λ is related with the opposite pad value of center gain.For example, when opposite center increases
When the pad value of benefit is 3db, λ=1/2.
BS 0 estimates the relative position of each UE according to the center angle-of- arrival estimation value and angle spread estimated value of each UE
Meter, then according to the ascending pilot frequency resource of the relative position parameter configuration next stage of each UE.Specifically, BS 0 is based on UE k
Center angle-of- arrival estimation valueWith angle spread estimated valueObtain the relative position estimates of parameters of UE k up channel
For
According to target UE:UE 0, UE 1 relative position region between relationship, can for both reconfigure respectively it is suitable
When ascending pilot frequency resource.
For example, having intersection between UE 0 and the relative position region of UE 1, it may be assumed thatThen in order to avoid
Signal interference, the up channel that BS 0 can configure UE 0 and UE 1 continue to use before mutually orthogonal ascending pilot frequency resource
Configuration, the up channel that can also configure UE 0 and UE 1 use new mutually orthogonal ascending pilot frequency resource.
If between UE 0 and the relative position region of UE 1 without intersection, it may be assumed thatThen illustrate the two
Between it is apart from each other, therebetween without interfering with each other, in order to extend SRS capacity, BS 0 can distribute nonopiate for UE 0 and UE 1
Ascending pilot frequency resource.
In specific implementation, it can realize that the ascending pilot frequency resource of the two is nonopiate for the two configuration different parameters.For example,
The identical running time-frequency resource of distribution but different virtual subdistricts that BS 0 is SRS 0 and SRS 1 identify (ID), so as to generate two
A degree of correlation be lower than preset threshold such as 10% random sequence, respectively as on identical running time-frequency resource UE 0 and UE 1 it is upper
Row pilot frequency sequence.
It is illustrated for being configured with non-orthogonal SRS for UE 0 and UE 1 below.
S206 sends the target UE and the non-orthogonal SRS configuration information of other UE.
The pilot resources SRS 0 and SRS that the configuration information received configures itself is respectively adopted in S207, UE 0 and UE 1
1。
Above step S205~S207 realizes this long-term letter of the relative position parameter of the target UE obtained according to estimation
Road characteristic parameter for target UE reconfigures ascending pilot frequency resource.
Stage 3: channel estimation, including step S208~S209 are carried out based on non-orthogonal SRS.
S208, BS 0 receives the non-orthogonal pilot signal SRS 0 and SRS 1 that UE 0 and UE 1 is sent.
It in specific implementation, can be using the transmission of the second class transmission frame and the non-orthogonal SRS of other UE in cell.Described
The density of the pilot signal of two class transmission frames is less than preset second pilot signal density threshold value, first pilot signal density
Threshold value is greater than or equal to the second pilot signal density threshold value.
Orthogonal pilot resources are transmitted using the higher first kind transmission frame of pilot signal density, the appearance of SRS can be extended
Amount.And in channel estimation process, on the basis of obtaining up channel long term channel characteristics parameter according to first kind transmission frame,
Further thin estimation is made using the lower second class transmission frame of pilot signal density, the same of channel estimation quality can improved
Shi Jieyue transfer resource.
In specific implementation, be to save transfer resource and giving consideration to channel to estimate quality, can be set pilot signal density compared with
The transmission cycle of high first kind transmission frame is greater than the transmission cycle of the lower second class transmission frame of pilot signal density.
S209 handles to obtain channel estimation results to what is received with the non-orthogonal SRS progress space filtering of other UE.
In specific implementation, receiver being filtered in 0 end installation space of BS, space is carried out to the pilot signal received
Filtering processing.
If the uplink channel estimation value of the target UE 0 received, UE 1 are respectivelyFourier change is carried out to it
Get its angle domain form in return:
Then the estimated value after carrying out inverse-Fourier transform to it space filtering can be obtained:
Wherein,Indicate the estimated value of up channel corresponding to UE 0,Indicate uplink corresponding to UE 1
The estimated value of channel.
The Signal to Interference plus Noise Ratio of channel can be improved using aforesaid way, therefore can be further improved its channel estimation quality.
It is understood that in specific implementation, can also using space filtering mode to the orthogonal SRS received into
Row space filtering is to improve its Signal to Interference plus Noise Ratio, to further increase channel estimation quality.
In specific implementation, above-mentioned channel estimation methods can be to any one UE as target UE, to its up channel
Carry out channel estimation.Any one described UE can be the UE being newly added, and be also possible to the UE in the cell, and base station can
With as needed, configure the ascending pilot frequency resource of the target UE and carry out uplink channel estimation, the uplink of the target UE is led
Frequency resource can in the cell covered with the base station a UE or multiple UE it is orthogonal or nonopiate.
For example, there is a cell to have a base station BS 0, it is mounted with the linear array of M root antenna composition, what is covered is small
There are multiple user equipmenies: UE 0, UE 1 ... UE k in area.BS0 needs the uplink pilot signal SRS 0 based on UE 0 to UE 0
Up channel carry out channel estimation, be still divided into three phases, the specific steps are as follows:
Stage 1: channel estimation is done based on orthogonal uplink pilot signal
Base station BS 0 is that UE 0 distributes the ascending pilot frequency resource SRS 0 orthogonal with other UE, and BS 0 is received after SRS 0
Uplink channel estimation is carried out to UE 0.
In view of receiving end additive noise, the reception signal of base station BS 0 can be indicated are as follows:
Wherein, y indicates the received uplink pilot signal of BS 0, hkIndicate the up channel of UEk, s0Indicate SRS 0, skTable
Show the corresponding uplink pilot sequence of SRS (uplink pilot signal), n indicates the receiving end additive noise of BS 0.
The SRS of SRS 0 and other UE is mutually orthogonal, that is, meets:
BS 0 receives SRS 0 known to signal and base station end based on ascending pilot frequency and estimates to the up channel progress channel of UE 0
Meter.
For example, BS 0 estimates the up channel of UE 0 using the mode of Least-squared method:
By above formula as it can be seen that due to s0With sk(k ≠ 0) is orthogonal, therefore the uplink estimated value of UE 0In there is no come from other
The interference of UE ascending pilot frequency.
Stage 2: base station BS 0 carries out the rough estimate of relative position to UE0 and adjusts UE uplink SRS
The uplink channel estimation value that BS 0 is obtained according to L based on orthogonal SRS carries out rough estimate to the relative position of UE 0
Meter.
In one embodiment of the invention example, the center to 0 up channel of UE can be passed through to 0 relative position rough estimate of UE
Angle of arrival and angle spread:
1) to uplink channel estimation value M × 1Fourier transform is done to convert to obtain its angle domain form:
Wherein,Indicate first of uplink channel estimation value based on orthogonal SRS of UE0.
2) the mould mean value of square of up channel angle domain estimation is calculated
3) the up channel center angle-of- arrival estimation of UE 0 is set toThe angle being worth where maximum element, it may be assumed that
4) the up channel angle of UE 0 is calculated according to the pad value (such as 3dB) of opposite center gain by following formula
Spread estimation δ0:
Wherein, λ is attenuation coefficient, and the value of λ is related with the opposite pad value of center gain.For example, when opposite center increases
When the pad value of benefit is 3db, λ=1/2.
BS 0 is according to the center angle-of- arrival estimation value of UE 0With angle spread estimated value δ0Obtain the phase of UE0 up channel
It is to position estimates of parameters
It, can be for UE 0 again according to the relationship between the relative position parameter of other UE in target UE:UE 0 and cell
Configure ascending pilot frequency resource appropriate.
In an embodiment of the present invention:
If 1)Then BS 0 uses the ascending pilot frequency resource distribution orthogonal with SRS k, or
Use the new ascending pilot frequency resource orthogonal with SRS k.
If 2)Then BS 0 can be distributed with the non-orthogonal ascending pilot frequency resource of SRS k to UE
0。
A kind of method for distributing nonopiate ascending pilot frequency resource is using running time-frequency resource identical as SRS k, but using in addition
One virtual subdistrict ID is low relevant at random with regard to sequence to generate one.
Stage 3: channel estimation is done based on non-orthogonal uplink pilot signal
Assuming that UE0 is configured for and UEk (k ≠ 0) non-orthogonal uplink pilot signal SRS 0, base station according to preceding method
BS 0 can use space filtering mode, and the uplink pilot signal SRS 0 based on UE0 carries out wink to the corresponding up channel of UE 0
When channel estimation.
It should be noted that the space filtering can be applied not only to the non-orthogonal situation of other SRS, come to reduce
The interference of other nonopiate ascending pilot frequencies is also applied for improving signal-to-noise ratio based on mutually orthogonal ascending pilot channel estimation.
It is understood that the above method is also applied for the base station configured with planar array or dual polarized antenna.In channel
In estimation procedure, for being configured with the base station of planar array, it is divided into both vertically and horizontally two dimensions and is handled.It is right
In the base station for being configured with dual polarized antenna, calculated respectively in two polarization directions.For example, for arbitrary target UE:
UEk can respectively obtain its relative position parameter such as first: center angle-of- arrival estimation in the vertical direction and the horizontal direction respectively
Value and angle spread estimated value.Such as: for a face battle array, the antenna element of one group of base station horizontal direction is taken to the up channel of UE 0
Channel conduct corresponding to elementObtain the center angle of arrival and angle spread of horizontal direction；Then base station vertical direction is taken
Antenna element corresponding to channel conductObtain the center angle of arrival and angle spread of vertical direction.Its relative position
Estimates of parameters also includes both vertically and horizontally two dimensions.Center angle-of- arrival estimation and angle of the BS 0 based on each UE
Spread estimation carries out geographical location rough estimate to UE 0, then formulates next stage according to the relative position estimates of parameters of each UE
Ascending pilot frequency resource distribution.
It is understood that predeterminable area is not limited to the cell that the base station is covered during uplink channel estimation.
In ascending pilot frequency resource distribution, it is not limited to be configured according only to the ascending pilot frequency resource of Intra-cell UE, it can also basis
The ascending pilot frequency resource of multiple Intra-cell UE is configured, it can configuration target UE ascending pilot frequency resource with comprising described
The ascending pilot frequency resource of the UE of multiple cells of base station institute coverage cell is orthogonal or nonopiate, can be between the base station of different community
The ascending pilot frequency resource of the UE of other cells is obtained by way of communicating back, and the UE's based on itself institute coverage cell is upper
The ascending pilot frequency resource of row pilot resources and other cells UE configures the ascending pilot frequency resource of the target UE, to mesh
The up channel for marking UE carries out channel estimation.Above scheme, it is contemplated that the ascending pilot frequency resource of peripheral cell is to administrative small
The disturbed condition of the up channel of target UE in area, therefore can be further improved precision of channel estimation, especially to small
The user equipment of area's intersection.
The method for carrying out uplink channel estimation using detecting pilot frequency signal (SRS) is carried out above by specific embodiment
Detailed description, it is to be understood that above-mentioned channel estimation methods are also applied for the channel based on other kinds of pilot signal
Estimation, specific method can refer to above-described embodiment, and which is not described herein again.
The embodiment of the invention also provides a kind of pilot signal transmission methods, specifically comprise the following steps:
S301 transmits mutually orthogonal pilot signal using first kind transmission frame.
S302 transmits non-orthogonal pilot signal using the second class transmission frame.
Wherein, pilot signal density is close greater than pilot signal in the second class transmission frame in the first kind transmission frame
Degree.
Orthogonal pilot resources are transmitted using the higher first kind transmission frame of pilot signal density, pilot signal can be extended
Capacity.And in channel estimation process, in the base for obtaining up channel long term channel characteristics parameter according to first kind transmission frame
On plinth, further thin estimation is made using the lower second class transmission frame of pilot signal density, channel estimation matter can improved
Transfer resource is saved while amount.
In specific implementation, be to save transfer resource and giving consideration to channel to estimate quality, can be set pilot signal density compared with
The transmission cycle of high first kind transmission frame is greater than the transmission cycle of the lower second class transmission frame of pilot signal density.
It is understood that in specific implementation, the limitation of sequence is not carried out between step S301 and S302.
In specific implementation, the pilot signal transmission method is suitable for each including detecting pilot frequency signal (SRS)
Kind pilot signal.
To more fully understand those skilled in the art and realizing the present invention, the embodiment of the invention also provides can be realized
The base station of above-mentioned uplink channel estimation method is described in detail the structure of the base station referring to Fig. 3.
As shown in figure 3, base station 30 includes following component part:
First configuration unit 31, is suitable for target UE collocating uplink pilot resources, and the target UE is located in predeterminable area；
First receiving unit 32, suitable for receiving the pilot signal of UE in the predeterminable area；
First estimation unit 33 calculates separately institute suitable for the pilot signal based on UE in the predeterminable area received
State the uplink channel estimation value of UE in predeterminable area；
Second estimation unit 34 is estimated suitable for the uplink channel estimation value based on the UE of predetermined number in the predeterminable area
Count the long term channel characteristics parameter of the target UE up channel；
Second configuration unit 35, suitable for the target UE up channel for estimating to obtain based on second estimation unit 34
Long term channel characteristics parameter, configure the ascending pilot frequency resource of the target UE；
Second receiving unit 36, suitable for receiving second configuration unit 35 with the pilot signal for postponing the target UE；
Third estimation unit 37, suitable for the pilot signal received based on second receiving unit 36, to the target
The up channel of UE carries out transient channel estimation, using estimated result as the uplink channel estimation value of the target UE.
In specific implementation, the predeterminable area can be for the base station institute coverage cell or to include the base station institute
Multiple cells of coverage cell.
In an embodiment of the present invention, first configuration unit 31 is suitable for the target UE configuration and institute
State the orthogonal ascending pilot frequency resource of other users equipment in predeterminable area.
In specific implementation, the long term channel characteristics parameter of the target UE up channel may include: the target UE
Relative position parameter or the corresponding up channel of the target UE channel strength, wherein the relative position parameter can
For determining relative position region of the target UE with respect to base station.The opposite of the target UE is obtained by calculating
The channel strength of location parameter or the corresponding up channel of the target UE, can reflect the target UE
Long term channel characteristics, therefore the quality of channel estimation can be improved.
In specific implementation, the relative position parameter of the target UE includes: the center of the up channel of the target UE
Angle of arrival and up channel angle spread.
In specific implementation, second estimation unit 34 may include following component part:
Angle domain estimates subelement 341, carries out Fourier transform suitable for the uplink channel estimation value to the target UE and obtains
To its angle domain estimated value；
Mean value computation subelement 342, it is equal suitable for calculating the mould square of up channel angle domain estimated value of the target UE
Value；
Angle-of- arrival estimation subelement 343, suitable for the mould square of the up channel angle domain estimated value of the target UE is equal
It is worth up channel center angle-of- arrival estimation value of the angle where maximum element as the target UE；
Angle spread estimates subelement 344, suitable for the pad value according to opposite center gain, calculates the upper of the target UE
Row channel angle spread estimation value.
In specific implementation, second configuration unit 35, may include following one or more of them:
First configuration subelement 351, suitable for other UE in the relative position region of the target UE and the predeterminable area
Relative position region when having intersection, the ascending pilot frequency resource orthogonal with other UE for remaining the target UE configuration is constant,
Or the ascending pilot frequency resource orthogonal with other UE is reconfigured for the target UE.
Second configuration subelement 352, suitable for when the target UE relative position region and the predeterminable area in other
When the relative position region of UE is without intersection, led for target UE distribution with the non-orthogonal uplink of other UE in the predeterminable area
Frequency resource.
In specific implementation, the second configuration subelement 352, is suitable in the target UE and the predeterminable area
Other UE distribute different virtual subdistrict marks to generate with other UE degrees of correlation in the predeterminable area lower than preset threshold
Ascending pilot frequency resource of the random sequence as the target UE.
In an embodiment of the present invention, the third estimation unit 37 is suitable for using space filtering mode to the target UE
Up channel carry out transient channel estimation.
In specific implementation, the base station 30 can be configured with linear array antenna or planar array.
In specific implementation, the pilot signal is detecting pilot frequency signal.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (26)
1. a kind of method that base station carries out uplink channel estimation characterized by comprising
For target UE collocating uplink pilot resources, the target UE is located in predeterminable area；
The pilot signal of user equipment in the predeterminable area is received, and calculates separately the upper of user equipment in the predeterminable area
Row channel estimation value；
Based on the uplink channel estimation value of the user equipment of predetermined number in the predeterminable area, the target UE is estimated
The long term channel characteristics parameter of up channel；
According to the long term channel characteristics parameter of the target UE up channel, the target UE is reconfigured
Ascending pilot frequency resource；
The pilot signal of the target UE is received, and transient channel is carried out to the up channel of the target UE
Estimation, using estimated result as the uplink channel estimation value of the target UE.
2. the method that base station according to claim 1 carries out uplink channel estimation, which is characterized in that the predeterminable area is
The base station institute coverage cell is multiple cells comprising base station institute coverage cell.
3. the method that base station according to claim 2 carries out uplink channel estimation, which is characterized in that described is target user
Device configuration ascending pilot frequency resource, comprising:
The ascending pilot frequency resource orthogonal with other users equipment in the predeterminable area is configured for the target UE.
4. the method that base station according to claim 3 carries out uplink channel estimation, which is characterized in that the target user sets
The long term channel characteristics parameter of standby up channel, comprising: the relative position parameter or the target of the target UE
The channel strength of the corresponding up channel of user equipment, the relative position parameter is for determining phase of the user equipment with respect to base station
To the band of position.
5. the method that base station according to claim 4 carries out uplink channel estimation, which is characterized in that the target user sets
Standby relative position parameter includes: that the center angle of arrival of the up channel of the target UE and up channel angle expand
Exhibition.
6. the method that base station according to claim 5 carries out uplink channel estimation, which is characterized in that be based on the preset areas
The uplink channel estimation value of the user equipment of predetermined number in domain, estimates the long-term channel of the target UE up channel
Characteristic parameter, comprising:
Fourier transform is carried out to the uplink channel estimation value of the target UE and obtains its angle domain estimated value；
Calculate the mould mean value of square of the up channel angle domain estimated value of the target UE；
By the angle where the maximum element of mould mean value of square of the up channel angle domain estimated value of the target UE
Up channel center angle-of- arrival estimation value as the target UE；
According to the pad value of opposite center gain, the up channel angle spread estimated value of the target UE is calculated.
7. the method that base station according to claim 3 carries out uplink channel estimation, which is characterized in that described according to the mesh
The long term channel characteristics for marking user equipment, reconfigure the ascending pilot frequency resource of the target UE, comprising:
When the relative position area of other users equipment in the relative position region of the target UE and the predeterminable area
When there is intersection in domain, the ascending pilot frequency resource orthogonal with other users equipment for remaining the target UE configuration is constant.
8. the method that base station according to claim 3 carries out uplink channel estimation, which is characterized in that described according to the mesh
The long term channel characteristics for marking user equipment, reconfigure the ascending pilot frequency resource of the target UE, comprising:
When the relative position area of other users equipment in the relative position region of the target UE and the predeterminable area
When there is intersection in domain, the ascending pilot frequency resource orthogonal with other users equipment is reconfigured for the target UE.
9. the method that base station according to claim 3 carries out uplink channel estimation, which is characterized in that described according to the mesh
The long term channel characteristics for marking user equipment, reconfigure the ascending pilot frequency resource of the target UE, comprising:
When the relative position area of other users equipment in the relative position region of the target UE and the predeterminable area
When domain is without intersection, for target UE distribution and the non-orthogonal ascending pilot frequency of other users equipment in the predeterminable area
Resource.
10. the method that base station according to claim 9 carries out uplink channel estimation, which is characterized in that described is the mesh
Mark user equipment distribution and the non-orthogonal ascending pilot frequency resource of other users equipment in the predeterminable area, comprising:
For the target UE and the other users equipment in the predeterminable area distribute different virtual subdistricts identify with
The random sequence with the other users equipment degree of correlation in the predeterminable area lower than preset threshold is generated as the target user
The ascending pilot frequency resource of equipment.
11. the method that base station according to claim 9 carries out uplink channel estimation, which is characterized in that described in the reception
The pilot signal of target UE, and transient channel estimation is carried out to the up channel of the target UE, comprising:
Transient channel estimation is carried out using up channel of the space filtering mode to the target UE.
12. the method that base station according to claim 3 carries out uplink channel estimation, which is characterized in that use the first pilot tone
The transmission frame of signal density transmits the pilot signal orthogonal with other users equipment in the predeterminable area；Believed using the second pilot tone
Transmission frame transmission and the non-orthogonal pilot signal of other users equipment in the predeterminable area of number density；The first pilot tone letter
Number density is greater than second pilot signal density.
13. the method that base station according to claim 3 carries out uplink channel estimation, which is characterized in that when the preset areas
When domain is comprising multiple cell of base station institute coverage cell, the base station of different community obtains it by way of communicating back
The ascending pilot frequency resource of the user equipment of his cell, and the ascending pilot frequency resource of the user equipment based on itself institute coverage cell and
The ascending pilot frequency resource of other cell user equipments configures the ascending pilot frequency resource of the target UE.
14. the method that base station according to claim 1 carries out uplink channel estimation, which is characterized in that the base station configuration
There are linear array antenna or planar array.
15. the method that base station according to claim 1 carries out uplink channel estimation, which is characterized in that the pilot signal
For detecting pilot frequency signal.
16. a kind of base station characterized by comprising
First configuration unit, is suitable for target UE collocating uplink pilot resources, and the target UE is located at default
In region；
First receiving unit, suitable for receiving the pilot signal of user equipment in the predeterminable area；
First estimation unit calculates separately institute suitable for the pilot signal based on user equipment in the predeterminable area received
State the uplink channel estimation value of user equipment in predeterminable area；
Second estimation unit is estimated suitable for the uplink channel estimation value based on the user equipment of predetermined number in the predeterminable area
Count the long term channel characteristics parameter of the target UE up channel；
Second configuration unit, suitable for the target UE up channel estimated based on second estimation unit
Long term channel characteristics parameter configures the ascending pilot frequency resource of the target UE；
Second receiving unit, the pilot signal suitable for the target UE after reception second configuration of described dispensing unit；
Third estimation unit, suitable for the pilot signal received based on second receiving unit, to the target UE
Up channel carry out transient channel estimation, using estimated result as the uplink channel estimation value of the target UE.
17. base station according to claim 16, which is characterized in that the predeterminable area for the base station institute coverage cell or
Person is multiple cells comprising base station institute coverage cell.
18. base station according to claim 17, which is characterized in that first configuration unit is suitable for the target and uses
The family device configuration ascending pilot frequency resource orthogonal with other users equipment in the predeterminable area.
19. base station according to claim 18, which is characterized in that the long-term channel of the target UE up channel
Characteristic parameter, comprising: the relative position parameter of the target UE or the corresponding uplink letter of the target UE
The channel strength in road, the relative position parameter is for confirming relative position region.
20. base station according to claim 19, which is characterized in that the relative position parameter packet of the target UE
It includes: the center angle of arrival and up channel angle spread of the up channel of the target UE.
21. base station according to claim 20, which is characterized in that second estimation unit includes:
Angle domain estimates subelement, carries out Fourier transform suitable for the uplink channel estimation value to the target UE and obtains
Its angle domain estimated value；
Mean value computation subelement, it is equal suitable for calculating the mould square of up channel angle domain estimated value of the target UE
Value；
Angle-of- arrival estimation subelement, suitable for by the mould mean value of square of the up channel angle domain estimated value of the target UE
Up channel center angle-of- arrival estimation value of the angle as the target UE where maximum element；
Angle spread estimates subelement, suitable for the pad value according to opposite center gain, calculates the upper of the target UE
Row channel angle spread estimation value.
22. base station according to claim 18, which is characterized in that second configuration unit, including it is following at least within
It is a kind of:
First configuration subelement, suitable for other users in the relative position region of the target UE and the predeterminable area
When there is intersection in the relative position region of equipment, the orthogonal with other users equipment upper of target UE configuration is remained
Row pilot resources are constant, or the ascending pilot frequency resource orthogonal with other users equipment is reconfigured for the target UE；
Second configuration subelement, suitable for when other use in the relative position region of the target UE and the predeterminable area
When the relative position region of family equipment is without intersection, set for target UE distribution with other users in the predeterminable area
Standby non-orthogonal ascending pilot frequency resource.
23. base station according to claim 22, which is characterized in that the second configuration subelement is suitable for the target
User equipment distributes different virtual subdistricts from the other users equipment in the predeterminable area and identifies to generate and preset with described
The other users equipment degree of correlation is lower than ascending pilot frequency of the random sequence of preset threshold as the target UE in region
Resource.
24. base station according to claim 22, which is characterized in that the third estimation unit is suitable for using space filtering side
Formula carries out transient channel estimation to the up channel of the target UE.
25. base station according to claim 16, which is characterized in that the base station is configured with linear array antenna or planar array.
26. base station according to claim 16, which is characterized in that the pilot signal is detecting pilot frequency signal.
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| CN107295691A (en) * | 2017-07-10 | 2017-10-24 | 武汉米风通信技术有限公司 | Location information passback dispatching method based on ultra-narrow band |
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| CN103259581B (en) * | 2012-02-16 | 2016-08-03 | 电信科学技术研究院 | A kind of carry out the method for antenna calibration, system and equipment |
| CN106233684B (en) * | 2014-05-08 | 2019-11-29 | 华为技术有限公司 | Channel estimation in wireless communication network node |
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| CN101867938A (en) * | 2009-04-20 | 2010-10-20 | 大唐移动通信设备有限公司 | Method and device for configuring uplink reference signal of multipoint cooperative transmission |
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