CN109120565A - FDD system down channel estimation method and base station, readable storage medium storing program for executing and equipment - Google Patents

FDD system down channel estimation method and base station, readable storage medium storing program for executing and equipment Download PDF

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Publication number
CN109120565A
CN109120565A CN201710486235.XA CN201710486235A CN109120565A CN 109120565 A CN109120565 A CN 109120565A CN 201710486235 A CN201710486235 A CN 201710486235A CN 109120565 A CN109120565 A CN 109120565A
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China
Prior art keywords
user terminal
feedback information
channel
frequency signal
base station
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罗喜良
潘振岗
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Beijing Spreadtrum Hi Tech Communications Technology Co Ltd
ShanghaiTech University
University of Shanghai for Science and Technology
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Beijing Spreadtrum Hi Tech Communications Technology Co Ltd
University of Shanghai for Science and Technology
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Priority to CN201710486235.XA priority Critical patent/CN109120565A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver

Abstract

A kind of FDD system down channel estimation method and base station, readable storage medium storing program for executing and equipment, the FDD system down channel estimation method include: to generate down-bound pilot frequency signal when there are downlink channel estimation demand；The value of the pilot parameters of the corresponding each transmitting antenna of the down-bound pilot frequency signal is the random integers within 0~N-1, and the value of the corresponding pilot parameters of each antenna is different, N is the sum of the corresponding subcarrier of the down-bound pilot frequency signal, and N > 1；Down-bound pilot frequency signal is sent to user terminal；Receive the feedback information of the user terminal uploads；According to the feedback information, the corresponding down channel of the user terminal is estimated.Above scheme can be improved the accuracy of down channel estimation.

Description

FDD system down channel estimation method and base station, readable storage medium storing program for executing and equipment
Technical field
The present invention relates to wireless communication field more particularly to a kind of FDD system down channel estimation method and base stations, readable Storage medium and equipment.
Background technique
In frequency division duplex (Frequency Division Dual, FDD) multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) in system, uplink and downlink channel does not have time division duplex (Time Division Dual, TDD) The channel reciprocity of system.Base station when obtaining user terminal (User Equipment, UE) channel state information, need to Family terminal (UE) carries out individual down channel estimation.
In the prior art, base station first sends down-bound pilot frequency signal to UE when carrying out down channel estimation.Each UE according to The pilot signal received carries out channel estimation, and will will estimate the obtained information feedback to base station.Traditional In the design of FDD system descending pilot frequency, usually just for a specific UE, such pilot design method can make a spy The down channel estimation of fixed UE is more accurate.But due to the same descending pilot frequency of all user sharings, and different UE Optimal descending pilot frequency is different, therefore the accuracy of the down channel estimation of others UE may be poor.
Summary of the invention
What the embodiment of the present invention solved is how to improve the accuracy of the down channel estimation of different UE.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of FDD system down channel estimation method, comprising: When there are downlink channel estimation demand, down-bound pilot frequency signal is generated；Down-bound pilot frequency signal corresponding each transmitting day The value of the pilot parameters of line is the random integers within 0~N-1, and the value of the corresponding pilot parameters of each antenna is respectively not Identical, N is the sum of the corresponding subcarrier of the down-bound pilot frequency signal, and N > 1；Down-bound pilot frequency signal is sent to user terminal； Receive the feedback information of the user terminal uploads；According to the feedback information, down channel corresponding to the user terminal Estimated.
Optionally, the FDD system down channel estimation method further include: send down channel to the user terminal The departure angle of channel support collection and downlink.
Optionally, the feedback information for receiving user terminal uploads, comprising: receive the process of the user terminal uploads Feedback information after compression；The feedback information after overcompression are as follows: the user terminal is according to the channel support The reciprocity of collection and the departure angle of downlink compress the feedback information that estimation obtains.
Optionally, the feedback information for receiving the user terminal uploads, comprising: institute is received using Kalman filter State the feedback information after overcompression of user terminal uploads.
Optionally, the feedback information after overcompression of the user terminal uploads are as follows:Wherein, Q [n]HFor the conjugate transposition of Q [n],For time domain overlapped channels；Q [n] is n-th of moment design for compressing observation Matrix: Q [n]=BU (:, 0:L-1)；Wherein,U(:,0:L-1) For the corresponding feature vector of preceding L maximum eigenvalue of Matrix C, C=B Θ [n] M [n | n-1]2Θ[n]HB, L are preset Feedback quantity, M [n | n-1] are the prediction MSE matrixes at the (n-1)th moment of Kalman filter；
For the user terminal and transmitting day The corresponding channel support collection of channel impulse response between line；Π is transposed matrix, is suitable for the unit matrix of a MP × MP 'sOrder rearrangement obtains,For Kronecker Product, 1PIndicate a length be P complete 1 column vector, 1MIndicate that a length is complete 1 column vector of M.
The embodiment of the invention also provides a kind of base stations, comprising: generation unit, for when there are downlink channel estimation demands When, generate down-bound pilot frequency signal；The value of the pilot parameters of the corresponding each transmitting antenna of the down-bound pilot frequency signal is 0~ Random integers within N-1, and the value of the corresponding pilot parameters of each antenna is different, N is descending pilot frequency letter The sum of number corresponding subcarrier, and N > 1；First transmission unit, for sending down-bound pilot frequency signal to user terminal；It receives Unit, for receiving the feedback information of the user terminal uploads；Estimation unit is used for according to the feedback information, to described The corresponding down channel of user terminal is estimated.
Optionally, the base station further include: the second transmission unit, for sending the letter of down channel to the user terminal The departure angle of road supported collection and downlink.
Optionally, the receiving unit, for receiving the feedback information after overcompression of the user terminal uploads, The feedback information after overcompression are as follows: the user terminal is according to the reciprocity of the channel support collection and downlink Departure angle compresses the feedback information that estimation obtains.
Optionally, the receiving unit, for using Kalman filter receive the user terminal uploads through over-voltage Feedback information after contracting.
Optionally, the feedback information after overcompression of the user terminal uploads are as follows:Wherein,For time domain overlapped channels, Q [n]HFor the conjugate transposition of Q [n], Q [n] is n-th of moment design for compressing observation Matrix: Q [n]=BU (:, 0:L-1)；Wherein,U(:,0:L- It 1) is the corresponding feature vector of preceding L maximum eigenvalue of Matrix C, C=B Θ [n] M [n | n-1]2Θ[n]HB, L are to preset Feedback quantity, M [n | n-1] is the prediction MSE matrix at the (n-1)th moment of Kalman filter；
For the user terminal and transmitting day The corresponding channel support collection of channel impulse response between line；Π is transposed matrix, is suitable for the unit matrix of a MP × MP 'sOrder rearrangement obtains,For Kronecker Product, 1PIndicate a length be P complete 1 column vector, 1MIndicate that a length is complete 1 column vector of M.
The embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer instruction, described The step of FDD system down channel estimation method described in executing any of the above-described kind when computer instruction operation.
The embodiment of the invention also provides a kind of electronic equipment, including memory and processor, stored on the memory There is the computer instruction that can be run on the processor, the processor executes any of the above-described when running the computer instruction The step of FDD system down channel estimation method described in kind.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
When generating down-bound pilot frequency signal each time, the pilot parameters of the corresponding each antenna of down-bound pilot frequency signal are taken Value is random, and the corresponding pilot parameters of each antenna are different, so as to avoid the channel of different antennas The case where tap of impulse response is in overlapping for a long time generation, thus can be improved user terminal down channel estimation it is accurate Degree.
Further, user terminal compresses feedback information after estimation obtains the feedback information of down channel, so that Base station receives the feedback information after overcompression, so as to reduce uplink expense.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of time domain overlapped channels；
Fig. 2 is the flow chart of one of embodiment of the present invention FDD system down channel estimation method；
Fig. 3 is the structural schematic diagram of one of embodiment of the present invention base station.
Specific embodiment
For a FDD system, the antenna number of base station is set as M, the antenna number of user terminal is 1.Base station uses orthogonal Frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) modulation system, subcarrier number For N.The frequency domain pilot signal that base station is sent on m root antenna are as follows:
Wherein, SmThe frequency domain pilot signal sent on m root antenna for base station；S0It is a diagonal matrix for basic sequence, The random number that diagonal element is zero-mean and amplitude is 1, S0It is randomly generated by base station, effect is that the interference of other cells is random Change；τmFor the corresponding pilot parameters of frequency domain pilot signal sent on m root antenna.Pilot parameters τmVisual effect be by m The channel impulse response cyclic shift τ of root transmitting antennamIt is rung again with the channel impulse after the displacement of other transmitting antennas of base station afterwards It should be superimposed.
The frequency-region signal that k-th of user terminal namely user terminal k are received are as follows:
Wherein, ykFor the frequency-region signal that k-th of user terminal receives, F is FFT matrix, hm,kFor the m root day of base station The time domain channel impulse of line to user terminal k respond, ωk~CN (0, I) is the corresponding Frequency domain noise of user terminal k.
By hmkIt is transformed into time domain, obtains time domain overlapped channels:
Wherein,For hm,kCorresponding time domain overlapped channels, FHFor the associate matrix of F,For S0Conjugate transposition square Battle array；ΘmΘ is classified as cyclic shift matrices, firstm(:, 0)=[0 ... 0,1,0 ..., 0]T, deposit before the 1st 1 of first row In τmA 0.
In above formula (1), pilot parameters τmVisual effect be to move the channel impulse response of m root transmitting antenna circulation Position τmIt is superimposed again with the channel impulse response after the displacement of other transmitting antennas of base station afterwards.It, may when doing down channel estimation There can be the case where tap overlapping of the corresponding channel impulse response of different transmitting antennas.
Referring to Fig.1, the schematic diagram of time domain overlapped channels is given.
In Fig. 1, the tap of the channel impulse response of the transmitting antenna TX1 of base station is 11,12,13, the transmitting antenna of base station The tap of the channel impulse response of TX2 is 14,15,16, the tap of the channel impulse response of the transmitting antenna TX3 of base station is 17, 18,19.It is known that the tap 16 of the corresponding channel impulse response of transmitting antenna TX2 is corresponding with transmitting antenna TX3 from Fig. 1 Channel impulse response tap 18 exist overlapping.When doing down channel estimation, the tap to overlap can be interfered with each other, Cause down channel estimation accuracy lower.
In embodiments of the present invention, when generating down-bound pilot frequency signal each time, down-bound pilot frequency signal is each corresponding The value of the pilot parameters of antenna is random, and the corresponding pilot parameters of each antenna are different, so as to keep away Exempt from tap the case where being in overlapping generation for a long time of the channel impulse response of different antennas, therefore user terminal can be improved The accuracy of down channel estimation.
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 FDD system down channel estimation methods, referring to Fig. 2, below by way of specific step Suddenly it is described in detail.
Step S201 generates down-bound pilot frequency signal when there are downlink channel estimation demand.
In specific implementation, for FDD system, when base station is there are when downlink channel estimation demand, downlink can be generated and lead Frequency signal.When generating down-bound pilot frequency signal, for each transmitting antenna of base station, selection is corresponded with transmitting antenna Pilot parameters.For different transmitting antennas, corresponding pilot parameters are different, and the pilot tone of all transmitting antennas Integer of the value range of parameter between [0, N-1].
As can be known from Fig. 1, it is the accuracy for realizing optimal down channel estimation, can choose one group of pilot parametersSo that overlapping is not present in the tap of the corresponding channel impulse response of all transmitting antennas.But work as serving cell When the quantity of interior user terminal is more, it is difficult to find one group of pilot parametersSo that the performance of all user terminals is same When be optimal.
For example, the product of the quantity and channel impulse response length of user terminal is greater than number of subcarriers N in serving cell, And the channel impulse response of different user terminals supported collection it is different when, different user terminals pairRequirement not Together.
Therefore, in embodiments of the present invention, believe to make the user terminal in serving cell that can possess preferable downlink Performance is estimated in road, the accuracy of the down channel estimation of the user terminal in serving cell is improved, when there are down channels for base station When potential demand, each time in down-bound pilot frequency signal generated, the corresponding pilot parameters of different transmitting antennas are taken for base station It is worth different, and the value of the corresponding pilot parameters of each transmitting antenna isAny of.
That is, when base station generates down-bound pilot frequency signal each time, the corresponding pilot parameters of each transmitting antenna Value all existIn optional one.That is, base station is in different moments down-bound pilot frequency signal generated, together The corresponding pilot parameters of a piece transmitting antenna are likely to different.
For example, base station generates down-bound pilot frequency signal at the t1 moment, the corresponding pilot parameters of m root transmitting antenna are τm=1； Base station generates down-bound pilot frequency signal at the t2 moment, and the corresponding pilot parameters of m root transmitting antenna are τm=3.
Therefore, in base station in different moments down-bound pilot frequency signal generated, the channel impulse of same root transmitting antenna The overlapping cases of the tap of response may be different.In current time pilot signal generated, the channel of m root transmitting antenna The tap of impulse response may be Chong Die with the tap of the channel impulse response of other transmitting antennas, and generated in subsequent time In pilot signal, the tap of the channel impulse response of m root transmitting antenna may be with the channel impulse response of other transmitting antennas Tap and there is no overlapping.
For example, base station generates down-bound pilot frequency signal at the t1 moment, the corresponding pilot parameters of m root transmitting antenna are τm=1, One tap of the channel impulse response of a tap and n-th transmitting antenna for the channel impulse response of m root transmitting antenna Overlapping.Base station generates down-bound pilot frequency signal at the t2 moment, at this point, the corresponding pilot parameters of m root transmitting antenna are τm=3, m The tap of the channel impulse response of root transmitting antenna is not be overlapped with the tap of the channel impulse response of n-th transmitting antenna.
Step S202 sends down-bound pilot frequency signal to user terminal.
In specific implementation, base station can send the down-bound pilot frequency signal of generation after generating down-bound pilot frequency signal User terminal in serving cell.User terminal in serving cell, can basis after receiving down-bound pilot frequency signal The down-bound pilot frequency signal received, estimation obtain corresponding channel state information.
Step S203 receives the feedback information of user terminal uploads.
In specific implementation, user terminal is estimated to obtain corresponding channel status according to the down-bound pilot frequency signal received After information, the information feedback that estimation can be obtained is to base station.That is, user terminal uploads feedback information To base station, base station receives the feedback information that user uploads.
In specific implementation, the channel state information that the feedback information of user terminal uploads can obtain for estimation, can also Think the information after the channel state information obtained to estimation compresses.
It, can be according to connecing in the prior art it is found that user terminal is after receiving the down-bound pilot frequency signal that base station issues The down-bound pilot frequency signal received estimates the channel state information of down channel, and the channel shape for the down channel that estimation is obtained State information upstream is fed back to base station, and the feedback overhead of user terminal and the number of antennas of base station are proportional.However, with extensive The application of MIMO (massive MIMO), the number of antennas of base station is more and more, and the feedback overhead of user terminal is larger.
It in embodiments of the present invention, is the feedback overhead for reducing user terminal, in user terminal according to the downlink received It is not the channel status directly by the down channel estimated after pilot signal estimates the channel state information of down channel Information feeds back to base station, but compresses to the channel state information of down channel, and by compressed channel state information Base station is fed back to, so as to reduce feedback overhead.That is, in embodiments of the present invention, the feedback of user terminal uploads Information is the channel state information after compression.
In specific implementation, user terminal can be according to the reciprocity of channel support collection and the departure angle of downlink, to estimating Obtained channel state information is counted to be compressed.
In practical applications it is found that when spatial resolution is lower, the different antennae of base station to the same user terminal Channel impulse response has identical channel support collection, as shown in following formula (4):
Wherein, support (hm,k) responded for the time domain channel impulse of k-th of user terminal and the m root antenna of base station.
The identical channel tap of the time delay of different transmitting antennas is extracted, g is denoted ass,k, then:
gs,k=[h1,k(s),h2,k(s),…,hM,k(s)]T； (5)
The identical channel tap of time delay is that electromagnetic wave is obtained by identical propagation path, and there are correlations, is denoted as:Correlation can be calculated by the angle information of propagation path and aerial array.Time delay is different Channel tap do not have correlation, it may be assumed that
In FDD system, channel does not have the reciprocity of TDD system, still, for some channel parameters, such as time delay Information, angle information etc. still have reciprocity.
Channel due to the channel support collection of the channel impulse response of up channel, with the channel impulse response of down channel Supported collection is identical, and therefore, base station can estimate the channel support collection of up channel according to uplink signal, obtains down channel Channel support collection.
Correspondingly, the angle of arrival of uplink and the departure angle of downlink are identical.It base station can be by estimating arriving for obtained uplink The departure angle of downlink is obtained up to angle.In linear antenna array, departure angle θ and angle spread θ is being obtainedasLater, may be used To calculate R using following formula (6)s,kEach element:
Wherein, d is the spacing of the transmitting antenna of base station, and λ is carrier wavelength.
It base station, can be by the support of down channel after the departure angle of the supported collection and downlink that get down channel Collection and the departure angle of downlink are sent to user terminal.For under normal conditions, the supported collection of down channel and downlink from The shared information content of beveling is less, and remains unchanged in a long time, will not bring biggish downlink expense.
For downlink, each user terminal can be accordingly to be regarded as independence, can individually handled.Succinctly just for symbol In explanation, for user terminal k, its subscript k is omitted.In multiple time slots, time slot index is indicated using [n].Assuming that down channelIt is Gauss-Markov model, state equation are as follows:
The observation equation of base station side are as follows:
The observation equation of base station side is user terminal uploads by compressed feedback information.In above formula (7), η For time correlation coefficient,For spatial coherence matrix, u [n]~CN (0, I) is to update Process matrix.In formula (8), Q [n]HFor the conjugate transposition of Q [n], Q [n] is the compression square that user terminal k is designed at the n-th moment Battle array,For time domain overlapped channels, can be calculated by formula (3), be in formula (3) k-th of user terminal n moment when Domain overlapped channels；It is compressed noise, A [n]=Q [n]HΘ [n] Π,
To take ?Column, and so on,To take?Column；Π is transposed matrix, can by a MP × The row of the unit matrix of MP is pressedOrder rearrangement obtains It arrives,For Kronecker product, 1PIndicate a length be P complete 1 column vector, 1MIndicate that a length is complete 1 column vector of M.
Channel state information after base station receives the compression of user terminal uploads using Kalman filter, estimation When the corresponding down channel of user terminal, the Q [n] of optimization are as follows:
Q [n]=BU (:, 0:L-1)； (9)
Wherein,U (:, 0:L-1) it is preceding L of Matrix C The corresponding feature vector of maximum eigenvalue, C=B Θ [n] M [n | n-1]2Θ[n]HB, L be preset feedback quantity, M [n | n- 1] be the (n-1)th moment of Kalman filter prediction MSE matrix.
Step S204 estimates the corresponding down channel of the user terminal according to the feedback information.
In specific implementation, base station receives the information of user terminal feedback, can carry out down channel estimation.
Referring to Fig. 3, the embodiment of the invention provides a kind of base stations 30, comprising: generation unit 301, the first transmission unit 302, receiving unit 303 and estimation unit 304, in which:
Generation unit 301, for generating down-bound pilot frequency signal when there are downlink channel estimation demand；The downlink is led The value of the pilot parameters of the corresponding each transmitting antenna of frequency signal is the random integers within 0~N-1, and each antenna The value of corresponding pilot parameters is different, and N is the sum of the corresponding subcarrier of the down-bound pilot frequency signal, and N > 1；
First transmission unit 302, for sending down-bound pilot frequency signal to user terminal；
Receiving unit 303, for receiving the feedback information of the user terminal uploads；
Estimation unit 304, for being estimated to the corresponding down channel of the user terminal according to the feedback information Meter.
In specific implementation, the base station can also include: the second transmission unit (being not shown in Fig. 3), be used for described User terminal sends the channel support collection of down channel and the departure angle of downlink.
In specific implementation, the receiving unit 303, can be used for receiving the user terminal uploads through overcompression it Feedback information afterwards, the feedback information after overcompression are as follows: the user terminal is mutual according to the channel support collection The departure angle of easy property and downlink compresses the feedback information that estimation obtains.
In specific implementation, the receiving unit 303, for receiving the user terminal uploads using Kalman filter The feedback information after overcompression.
In specific implementation, the feedback information after overcompression of the user terminal uploads are as follows: Wherein,For time domain overlapped channels, Q [n]HFor the conjugate transposition of Q [n], Q [n] is seeing for compressing for n-th of moment design The matrix of measured value: Q [n]=BU (:, 0:L-1)；Wherein,U(:, It is 0:L-1) the corresponding feature vector of preceding L maximum eigenvalue of Matrix C, C=B Θ [n] M [n | n-1]2Θ[n]HB, L are preparatory The feedback quantity of setting, M [n | n-1] are the prediction MSE matrixes at the (n-1)th moment of Kalman filter；
For the user terminal and transmitting day The corresponding channel support collection of channel impulse response between line；Π is transposed matrix, is suitable for the unit matrix of a MP × MP 'sOrder rearrangement obtains,For Kronecker Product, 1PIndicate a length be P complete 1 column vector, 1MIndicate that a length is complete 1 column vector of M.
The embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer instruction, described The step of computer instruction executes the FDD system down channel estimation method provided in the above embodiment of the present invention when running.
The embodiment of the invention provides a kind of electronic equipment, including memory and processor, stored on the memory There is the computer instruction that can be run on the processor, the processor executes in the present invention when running the computer instruction The step of FDD system down channel estimation method provided in embodiment is provided.
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 (12)

1. a kind of FDD system down channel estimation method characterized by comprising
When there are downlink channel estimation demand, down-bound pilot frequency signal is generated；Corresponding each of the down-bound pilot frequency signal is sent out The value of the pilot parameters of antenna is penetrated as the random integers within 0~N-1, and the value of the corresponding pilot parameters of each antenna Different, N is the sum of the corresponding subcarrier of the down-bound pilot frequency signal, and N > 1；
Down-bound pilot frequency signal is sent to user terminal；
Receive the feedback information of the user terminal uploads；
According to the feedback information, the corresponding down channel of the user terminal is estimated.
2. FDD system down channel estimation method as described in claim 1, which is characterized in that further include: it is whole to the user End sends the channel support collection of down channel and the departure angle of downlink.
3. FDD system down channel estimation method as claimed in claim 2, which is characterized in that on the reception user terminal The feedback information of biography, comprising:
Receive the feedback information after overcompression of the user terminal uploads；The feedback information after overcompression Are as follows: the user terminal is according to the reciprocity of the channel support collection and the departure angle of downlink, the feedback letter obtained to estimation What breath was compressed.
4. FDD system down channel estimation method as claimed in claim 3, which is characterized in that described to receive user's end Hold the feedback information uploaded, comprising:
The feedback information after overcompression of the user terminal uploads is received using Kalman filter.
5. FDD system down channel estimation method as claimed in claim 4, which is characterized in that the user terminal uploads By compressed feedback information are as follows:
Wherein, Q [n]HFor the conjugate transposition of Q [n],For time domain overlapped channels；Q [n] is n-th of moment design for pressing The matrix of contracting observation:
Q [n]=BU (:, 0:L-1)；
Wherein,U (:, 0:L-1) it is preceding L of Matrix C The corresponding feature vector of maximum eigenvalue, C=B Θ [n] M [n | n-1]2Θ[n]HB, L be preset feedback quantity, M [n | n- 1] be the (n-1)th moment of Kalman filter prediction MSE matrix；
For the user terminal and transmitting antenna Between the corresponding channel support collection of channel impulse response；Π is transposed matrix, is suitable for the unit matrix of a MP × MPOrder rearrangement obtains,For Kronecker product, 1PIndicate a length be P complete 1 column vector, 1MIndicate that a length is complete 1 column vector of M.
6. a kind of base station characterized by comprising
Generation unit, for generating down-bound pilot frequency signal when there are downlink channel estimation demand；The down-bound pilot frequency signal pair The value of the pilot parameters for each transmitting antenna answered is the random integers within 0~N-1, and each antenna is corresponding leads The value of frequency parameter is different, and N is the sum of the corresponding subcarrier of the down-bound pilot frequency signal, and N > 1；
First transmission unit, for sending down-bound pilot frequency signal to user terminal；
Receiving unit, for receiving the feedback information of the user terminal uploads；
Estimation unit, for estimating the corresponding down channel of the user terminal according to the feedback information.
7. base station as claimed in claim 6, which is characterized in that further include: the second transmission unit is used for the user terminal Send the channel support collection of down channel and the departure angle of downlink.
8. base station as claimed in claim 7, which is characterized in that the receiving unit, for receiving the user terminal uploads The feedback information after overcompression, the feedback information after overcompression are as follows: the user terminal is according to the letter The reciprocity of road supported collection and the departure angle of downlink compress the feedback information that estimation obtains.
9. base station as claimed in claim 8, which is characterized in that the receiving unit, for being received using Kalman filter The feedback information after overcompression of the user terminal uploads.
10. base station as claimed in claim 9, which is characterized in that the feedback after overcompression of the user terminal uploads Information are as follows:Wherein,For time domain overlapped channels；Q[n]HFor the conjugate transposition of Q [n], Q [n] is n-th The matrix for being used to compress observation of moment design:
Q [n]=BU (:, 0:L-1)；
Wherein,U (:, 0:L-1) is first L maximum spy of Matrix C The corresponding feature vector of value indicative, C=B Θ [n] M [n | n-1]2Θ[n]HB, L are preset feedback quantity, and M [n | n-1] is card The prediction MSE matrix at the (n-1)th moment of Thalmann filter；
For the user terminal and transmitting antenna Between the corresponding channel support collection of channel impulse response；Π is transposed matrix, is suitable for the unit matrix of a MP × MPOrder rearrangement obtains,For Kronecker product, 1PIndicate a length be P complete 1 column vector, 1MIndicate that a length is complete 1 column vector of M.
11. a kind of computer readable storage medium, is stored thereon with computer instruction, which is characterized in that the computer instruction Perform claim requires the step of 1~5 described in any item FDD system down channel estimation methods when operation.
12. a kind of electronic equipment, including memory and processor, it is stored with and can runs on the processor on the memory Computer instruction, which is characterized in that perform claim requires any one of 1~5 when the processor runs the computer instruction The step of described FDD system down channel estimation method.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113114428A (en) * 2021-05-21 2021-07-13 唐山学院 Multi-user detection method based on uplink scheduling-free NOMA system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8571086B2 (en) * 2004-04-02 2013-10-29 Rearden, Llc System and method for DIDO precoding interpolation in multicarrier systems
CN106452534A (en) * 2016-11-23 2017-02-22 南京邮电大学 Pilot optimization method for large-scale MIMO channel estimation based on structural compressed sensing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8571086B2 (en) * 2004-04-02 2013-10-29 Rearden, Llc System and method for DIDO precoding interpolation in multicarrier systems
CN106452534A (en) * 2016-11-23 2017-02-22 南京邮电大学 Pilot optimization method for large-scale MIMO channel estimation based on structural compressed sensing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
XILIANG LUO: ""A Scalable Framework for CSI Feedback in FDD Massive MIMO via DL Path Aligning"", 《IEEE TRANSACTIONS ON SIGNAL PROCESSING》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113114428A (en) * 2021-05-21 2021-07-13 唐山学院 Multi-user detection method based on uplink scheduling-free NOMA system

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