CN106411794A - Method for downlink channel estimation in base station of MIMO wireless communication system - Google Patents
Method for downlink channel estimation in base station of MIMO wireless communication system Download PDFInfo
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- CN106411794A CN106411794A CN201510466291.8A CN201510466291A CN106411794A CN 106411794 A CN106411794 A CN 106411794A CN 201510466291 A CN201510466291 A CN 201510466291A CN 106411794 A CN106411794 A CN 106411794A
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
- H04L25/03898—Spatial equalizers codebook-based design
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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
- H04L25/0204—Channel estimation of multiple channels
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Abstract
The invention relates to a method for downlink channel estimation in a base station of a MIMO wireless communication system. The base station of the MIMO wireless communication system comprises NT antennas and NFFT subcarriers. The method comprises steps of pre-coding pilot signals originating from respective RF links by means of first analog pre-coding matrixes associated with respective RF links to obtain first pilot signals; and mapping the pre-coded first pilot signals to all antennas connected to RF links and transmitting the first pilot signals by the antennas.
Description
Technical field
The present invention relates to radio network technique, in particular it relates to one kind is wireless in multiple-input, multiple-output
Be used in the base station of communication system Downlink channel estimation method, a kind of in multiple-input, multiple-output no
Be used in line communication system Downlink channel estimation base station, a kind of in multiple-input, multiple-output channel radio
It is used for the method for Downlink channel estimation in the user equipment of letter system and one kind is entering more
It is used for the user equipment of Downlink channel estimation in multiple-output wireless communication system.
Background technology
Due to its reduce the quantity of radio frequency link and realize simultaneously completely beam shaping/
The ability of the brilliance of diversity gain aspect, the analog/digital precoding of mixing is multiple-input, multiple-output
MIMO technology provides a kind of inexpensive and efficient solution.With traditional cardinar number
Word precoding (each antenna element must be equipped with single radio frequency link wherein) compares,
The precoding of mixing can significantly decrease the quantity of radio frequency link and realize similar simultaneously
Performance.Mixing precoding another important advantage be its have low-down training and
Feedback overhead, compared with digital precoding, this point frequency division multiplexing FDD it
In highly useful.Due to for the multiple-input, multiple-output mimo system based on pure digi-tal precoding,
Its required training and feedback overhead linearly increase with the increase of antenna amount, so that
Must be difficult to realize under FDD based on the multiple-input, multiple-output mimo system of digital precode.Borrow
Help mix precoding, this problem is addressed.Among mixing precoding, the signal in space
Process the digital precode that operation is divided into high-dimensional simulation precoding and low dimensional.Simulation
Precoding realized using inexpensive radio-frequency phase shifter network, this phase shifter network can be with
Different structures is realizing.Based on mixing precoding algorithms, simulation precoding is designed to and letter
After road spatial correlation matrix matches, and digital precode is designed to and simulates precoding
Efficient channel match.This algorithm makes mixing precoding be suitable to frequency division multiplexing FDD system,
Because the calculating of simulation pre-coding matrix only needs to the broad-band channel correlation matrix information changing slowly,
Its required training and feedback size only with radio frequency link quantity linear increase, rather than with
Antenna number linear increase.Because radio frequency link quantity is much smaller than antenna amount, required training and
Feedback overhead substantially reduces.
In order to realize mixing precoding under FDD system, downlink physical channel is estimated
It is needs for a user, so that the correlation matrix of its estimation and feedback space.Tradition
Physical channel estimation technique allow different antennas to transmit on different running time-frequency resources to lead
Frequently, therefore do not interfere between the pilot tone of different antennae.But under mixing precoding framework, by
In the use of phase shifter network, this traditional pilot transmission techniques are simultaneously inapplicable.It is connected to phase
Antenna with radio frequency link must transmit pilot tone using identical running time-frequency resource, causes difference
Interference between the pilot tone of antenna.
Content of the invention
According to the above-mentioned understanding to background technology and the technical problem of presence, the present invention it
In will discuss for mixing analog/digital pre-coding system downlink (DL) channel
Estimation problem.Due to mixing the reason of the specific hardware configuration of precoding, traditional descending chain
Between the different antennae that path channels estimation technique uses, mutually orthogonal pilot tone is used for here discomfort
With.Because downlink physical channel estimation and user feedback to obtain channel for base station
Status information is most important for precoding, and especially under fdd mode, it is also mixed
Close one of key technology of precoding.This problem will be solved and propose one among the present invention
Plant senior pilot transmission and channel estimation technique, to solve that there is any RF phase shifter network
The problem that in the mixing precoding of structure, downlink physical channel is estimated.
A first aspect of the present invention proposes a kind of base station in MIMO radio communication system
In for Downlink channel estimation method, wherein, described MIMO radio communication system
Base station among there is NTIndividual antenna and NFFTIndividual subcarrier, methods described includes：
- by from each radio frequency link pilot signal by means of with each radio frequency link described
The first associated simulation pre-coding matrix carries out precoding to obtain the first pilot signal；And
- the first pilot signal through precoding is mapped to each radio frequency link described even
All antennas of connecing and being transmitted by described antenna.
In one embodiment of the present invention, borrow from the pilot signal of different radio frequency links
Help different OFDM symbol to be transmitted.
In one embodiment of the present invention, through precoding the first pilot signal will by with
All antennas that each radio frequency link described is connected are transmitted simultaneously.
In one embodiment of the present invention, the quantity of the radio frequency link being used by this base station
S is less than quantity NT of antenna.
In one embodiment of the present invention, the radio frequency link being used from it by this base station
The transmission that quantity is that s≤S radio frequency link is used for pilot signal is selected in quantity S.
In one embodiment of the present invention, methods described further includes：
- to comprising T OFDM symbol and NFFTThe running time-frequency resource of individual subcarrier carries out subregion
To obtain the time/frequency source block of the running time-frequency resource unit comprising equal number；
- pilot signal among each time/frequency source block is adopted and described time/frequency source block phase
Second simulation pre-coding matrix of association carries out precoding to obtain the second pilot signal；And
- the second pilot signal through precoding is mapped to each radio frequency link described even
All antennas of connecing and being transmitted by described antenna.
In one embodiment of the present invention, the correspondence in described second simulation pre-coding matrix
The often row of different antennae is mutually orthogonal each other.
A second aspect of the present invention proposes one kind and is used in MIMO radio communication system
The base station of Downlink channel estimation, wherein, described base station is characterised by implementing according to this
Method described by bright first aspect.
A third aspect of the present invention proposes a kind of user in MIMO radio communication system
The method being used for Downlink channel estimation in equipment, methods described includes：
- receive the first pilot signal from the base station being connected with described user equipment, wherein, described
First pilot signal is derived from each radio frequency link, is associated by means of with each radio frequency link described
The first simulation pre-coding matrix carry out precoding, be mapped to and each radio frequency link described even
All antennas of connecing and being transmitted by described antenna；And
- described user equipment carries out time delay estimation according to described first pilot signal.
In one embodiment of the present invention, methods described further includes：
- receive the second pilot signal from the base station being connected with described user equipment, wherein, described
Second pilot signal is to comprising T OFDM symbol and NFFTThe running time-frequency resource of individual subcarrier
Carry out piecemeal to obtain comprising the time/frequency source block of the running time-frequency resource unit of equal number and right
Pilot signal among each time/frequency source block is using the being associated with described time/frequency source block
Two simulation pre-coding matrixes are carried out precoding, are mapped to and are connected with each radio frequency link described
All antennas and be transmitted by described antenna and obtain the second pilot signal；And
- described user equipment carries out channel estimation according to described second pilot signal.
In one embodiment of the present invention, described user equipment is estimated always according to described time delay
Carry out assisted channel estimation.
A fourth aspect of the present invention proposes one kind and is used in MIMO radio communication system
The user equipment of Downlink channel estimation, wherein, described base station is characterised by implementing basis
Method described by a third aspect of the present invention.
As described above, existing channel estimation technique is designed for digital pre-coding system,
It is not applied for the mixing pre-coding system with phase shifter network, because the drawing of phase shifter
Enter.And can successfully solve problem above and reach and use phase according to the technology of the present invention
With pilot-frequency expense the same performance of existing channel estimation.
Brief description
Read the following detailed description to non-limiting example by referring to accompanying drawing,
The other features, objects and advantages of the present invention will become more apparent upon.
Fig. 1 shows signal Figure 100 of the pilot transmission solution in time delay estimation stages；
And
Fig. 2 shows signal Figure 200 of the pilot transmission solution in channel estimation phase.
In in figure, run through different diagrams, same or similar reference represent identical or
Similar device (module) or step.
Specific embodiment
In order to methods and apparatus of the present invention and side using the foundation present invention are better described
Method or the user equipment and the base that are applied to cordless communication network that include foundation assembly of the invention
Stand, introduce the two important prior arts arriving used herein below first, respectively modulate
Wide-band transducer technology and cycle characteristics detection technique.Referring to the drawings and correlation formula does letter
Single introduction.
In the specific descriptions of following preferred embodiment, will be a part of with reference to constituting the present invention
Appended accompanying drawing.Appended accompanying drawing has been illustrated by way of example and has been capable of the present invention's
Specific embodiment.The embodiment of example is not intended as all enforcements according to the present invention for the limit
Example.It is appreciated that without departing from the scope of the present invention, it is possible to use other enforcements
Example is it is also possible to carry out structural or logicality modification.Therefore, specific descriptions below are simultaneously
Nonrestrictive, and the scope of the present invention is defined by the claims appended hereto.
Hereinafter the ofdm system considering a multiple-input, multiple-output MIMO had NTIndividual base station
Antenna, single-antenna subscriber and NFFTIndividual subcarrier.Wherein base station uses S (S<<NT) individual
Radio frequency link, and precoding is carried out using mixing precoding technique.Mixing precoding can adopt
The phase shifter network of arbitrary structures.Proposed downlink physical channel estimation technique includes two
Individual stage, respectively time delay estimation stages and channel estimation phase.Next introduced this respectively
Two stages.
Introduce time delay estimation stages first, in this stage, all of radio frequency in radio frequency link
The radio frequency link of link or a part is used for transmitting pilot tone so that user's estimation time delay.It is derived from
The pilot tone of different radio frequency links is transmitted among different OFDM symbol.At each
Among OFDM symbol, only transmission is derived from the pilot tone of a radio frequency link.For each rf chain
For road, pilot tone is equally spaced inserted on whole bandwidth by discontinuous.From a radio frequency
The pilot tone of link carries out precoding by the simulation pre-coding matrix corresponding to this radio frequency link first,
Then it is mapped on all of antenna being connected with this radio frequency link and transmitted.No
Same radio frequency link uses different simulation pre-coding matrixes.A pilot transmission in this stage
Example as shown in figure 1, wherein, x represents pilot signal and cs(s=1～S) represents and is used for
The N of s-th radio frequency linkT* the pre-coding matrix of 1 simulation.Through precoding from one
The pilot tone of individual radio frequency link connects to the antenna simultaneous transmission of this radio frequency link from all.
After such precoding processing of base station side, user will connect from radio frequency link
Receive the pilot tone of time domain, its measurement power on each time delay, then equalization is from institute
There is the power of the pilot signal of radio frequency link and find out to have and exceed the threshold value limiting in advance
The time delay of power is as estimated time delay.In this stage, user simultaneously requires no knowledge about in base station
The pre-coding matrix of the simulation that side is used.
Channel estimation phase described below.It is assumed that this channel is in TcohIndividual OFDM symbol and
WcohIt is substantially flat on individual subcarrier.Therefrom select W and T corresponding resource, from
And make W≤min (Wcoh, S) and NT/W≤T≤Tcoh.W in S radio frequency link
Individual it is used for transmitting pilot tone among the continuous OFDM symbol of T.T OFDM symbol
On running time-frequency resource to be shared in an orthogonal manner by W radio frequency link.From a radio frequency
The pilot tone of link is come in addition pre- first by the simulation pre-coding matrix corresponding with this radio frequency link
Encode, be mapped to all antennas being connected with this radio frequency link and and then transmitted.No
Same radio frequency link is among different OFDM symbol using different simulation pre-coding matrixes.
Show the pilot transmission schemes in this channel estimation phase among Fig. 2, wherein, x represents
Pilot signal and cs,t(s=1～S) represents that s-th radio frequency link accords with t-th OFDM
Simulation pre-coding matrix used in number.Among this figure, different radio frequency links is not
Pilot tone is transmitted on same subcarrier.
As described above, connecting identical time-frequency will be used to the antenna of identical radio frequency link
Resource is used for transmitting pilot tone, and this will bring the interference between antenna in receiving terminal.Therefore, at this
The pre-coding matrix of the simulation that channel estimation phase is used must be careful to be designed thus
Be conducive to the elimination of inter-antenna interference.Given this purpose, the present invention is by T OFDM symbol
On running time-frequency resource be divided into NFFT/ W time/frequency source block, each time/frequency source block includes W
Continuous subcarrier and T continuous OFDM symbol.Due to W≤WcohAnd T≤Tcoh,
So the channel in each time/frequency source block be considered flat.This simulation precoding
Matrix is designed such that to be connected to the different antenna of a radio frequency link in each running time-frequency resource
Mutually orthogonal between the simulation precoding vector of experience on block.For example, it is assumed that all of antenna quilt
It is divided into L layer, identical in the layer antenna connects to identical radio frequency link, and in different layers
Antenna be connected to different radio frequency links.It is assumed that S (l) represent connect to l-th layer it
In the indexed set of the radio frequency link of antenna and suppose W=S.So used in Fig. 2
The pre-coding matrix of simulation must be designed to so that by { cs,t|s∈S (l), t=1～T } for arranging institute
The matrix of composition has mutually orthogonal row.
After user receives the pilot tone from all radio frequency links in T OFDM symbol,
User will implement MMSE channel estimation.Estimate will be by for produced time delay in the first stage
For estimating the frequency domain correlation matrix of this channel, the frequency domain correlation matrix estimating will be used for increasing
Strong MMSE channel estimation.By means of simulation pre-coding matrix orthogonal design can be successful
Ground eliminates the interference between antenna among MMSE channel estimation.
In this channel estimation phase, need to know the simulation precoding square being used for transmitting pilot tone
Battle array.Such information does not need among scheme before, because different base stations can make
With different simulation pre-coding matrixes.The structure of simulation pre-coding matrix is mixed depending on used
Close the structure of phase-shift network in precoding.Therefore, base station must notify by downlink signaling to use
The simulation pre-coding matrix that family oneself is used.Involved signaling consumption is very little, because
For need only to the precoding phase-shift network being used by base station indicating this mixing structure just
Can, and it does not change with frequency in time.
The design of the present invention will be expanded on further by means of formula below.
Below equation is based on following premise, and that is, OFDM mimo system has NFFTHeight
Carrier wave, base station equipment has NTIndividual antenna and be equipped with S<NTS radio frequency link.All skies
Line is divided into L layer, and every layer comprises NT/ L antenna.The antenna of same layer is connected to phase
On same radio frequency link, it is connected to different radio frequency links in the antenna of different layers.
In time delay estimation stages, using pilot transmission techniques mentioned above, S radio frequency
M radio frequency link in link is used for transmitting among M different OFDM symbol and leads
Frequently.Without loss of generality it is assumed that front M radio frequency link be used for transmit pilot tone it is assumed that
Represent the indexed set of the subcarrier of pilot transmission for each radio frequency link and makeHere it is assumed that all of radio frequency link uses identical J.User receive from
The pilot tone of s radio frequency link (among s-th OFDM symbol) is expressed as on frequency domain：
Wherein, ysRepresent the pilot signal from s-th radio frequency link receiving, it is
One size is the column vector of J*1, and H represents NT*NFFTThe frequency domain channel matrix of dimension,
Represent that inclusion has index and isRow H submatrix, x represents pilot signal and cs(s=
1～S) represent N for s-th radio frequency linkT* the simulation pre-coding matrix of 1 dimension.Then,
User is for ysCarry out discrete Fourier transform (DFT) thus it is converted into time domain from frequency domain
For：
Wherein,For ysTime-domain representation, F be NFFTFourier's matrix of-rank,For this
The N of channelT×NFFTDimension time-domain pulse response matrix andIt is known that having collection
The wireless channel of Chinese style antenna generally has sparse and identical on all of antenna
Time delay, soOnly there is considerably less non-zero column and so that hsIt is also sparse vector.
hsThe time delay of the positional representation channel of middle nonzero element, can be estimated with following formula：
Wherein,For the estimation of time delay,ForD-th element and Thred
For the threshold value limiting in advance.It is to be noted here that estimated time delay is necessarily less than pilot lengthThis is by when using the discontinuous pilot tone inserted at equal intervalsAmong element
Caused by repeatability.Therefore, pilot length have to be selected such that J>Dmax, wherein,
Dmax extends for maximum delay.
Next introduce channel estimation, wherein,Represent that s-th radio frequency link is used
To transmit the OFDM symbol of pilot tone and the index set of subcarrier pair, that is, only when
When, s-th radio frequency link is transmitted on w-th subcarrier of t-th OFDM symbol leads
Frequently.So received on w-th subcarrier of t-th OFDM symbol pilot tone represents
For：
Wherein, hwIs is the w row of H, Ct=[c1,t…cs,t…cS,t], bt,wFor S × 1 dimension
Vector, its s-th element bt,wS () indicates s-th radio frequency link in t-th OFDM symbol
W-th subcarrier on the pilot tone whether transmitted, that is,：
Consider all T OFDM symbol, formula (4) can be rewritten as (it is assumed that in T (T≤Tcoh)
Channel on individual OFDM symbol is flat)
Wherein,
Aw=[C1b1,w… CTbT,w] (7)
Received pilot superimposition on all subcarriers is entered a big matrix, thus
Obtain：
Wherein,
And
ReceiveAfterwards, user estimates channel matrix H using MMSE channel estimation technique,
Definition：
And
Wherein, σ2For noise variance.Among formula (11) and (12), RhIt is defined as：
Wherein, D=diag (d), d are using obtained from time delay estimated result during the power of channel
Prolong attribute (PDP).Then, obtained using MMSEFor：
Then willValuationIt is transformed to matrix form from vector form and obtain channel matrix H
Valuation.
Next introduce the design of the simulation pre-coding matrix for channel estimation：
Design simulation pre-coding matrix { C will be discussed how in this partt, t=1～T } so as with
Family side judicial convenience inter-antenna interference eliminates.For simplicity it is assumed that NFFT/ W is integer.T
N in OFDM symbolFFTIndividual subcarrier is divided into NFFT/ W Resource Block, each Resource Block bag
Containing W subcarrier and T OFDM symbol.Channel on the Resource Block that each W takes advantage of T
Can be considered as flat.
Assume that analog phase shifter network is divided into L layer, each layer comprises (S/L) × (NT/L)
The sub-network of dimension.Antenna among identical layer is connected to identical radio frequency link, different layers
Antenna connect to different radio frequency links.Wherein, simulate pre-coding matrix CtMust comply with following
Block diagonal structure：
Wherein, Ct,l(l=1～L) is (N corresponding to l layerT/ L) × (S/L) simulation precoding of tieing up
Matrix.Process b in an identical mannert,wThus obtaining：
Wherein, bt,w,lBe by l layer on w-th subcarrier of t-th OFDM symbol
The sequence of mapping being used, it is the vector of S/L × 1 dimension.This sequence of mapping { bt,w,lIt is to abide by
Follow following rule design：
W radio frequency link fifty-fifty shares the money that each size takes advantage of T for W in an orthogonal manner
Source block.
This identical mapping ruler is taken advantage of in the Resource Block of T for W in all of size and is repeated.
Follow above 2 points of rules and carry out design map sequence.WithRepresent s-th (s≤W)
Radio frequency link be used for transmitting OFDM symbol and the subcarrier pair of pilot tone among j-th Resource Block
Index set, thenIt is designed to following form, that is,：
(s≤W, s '≤W and s ≠ s ') (18)
And
Based on formula (15) and (16), among t-th OFDM symbol of formula (4)
On w subcarrier, received pilot tone can be represented with below equation, that is,：
Wherein, hW, lFor hw(the N corresponding to the antenna in l layerT/ L) × 1 subvector, that is,：
Because the antenna among different layers is connected to different radio frequency links and different
Radio frequency link transmits pilot tone on different running time-frequency resources, so between the antenna of different layers not
There is interference.So, formula (20) can be reduced to for specific layer：
yt,l(w)=(Ct,lbt,w,l)Thw,lx+nt,w,
Among formula (22)Represent and be used for transmitting by the radio frequency link of l layer
The index set of the OFDM symbol of pilot tone and subcarrier pair, wherein,Be l-th layer it
In radio frequency link indexed set.In view of all of all among T OFDM symbol
Subcarrier, the pilot tone being received from l layer can be expressed as：
Wherein,
Aw,l=[C1,lb1,w.l… Ct,lbt,w.l… CT,lbT,w.l] (24)
For the ease of eliminating the interference between antenna in different layers,It is designed such that source
Take advantage of on the Resource Block of T using mutually just for W from the pilot tone of the antenna of identical layer in each size
The simulation precoding vector handed over being simulated precoding, thus can be using coupling filter in receiver section
Ripple device easily to remove inter-antenna interference.Consider j-th (j=1～NFFT/ W) individual Resource Block.
On j-th Resource Block, the simulation pre-coding matrix corresponding to l layer is：
Using the mapping ruler among formula (17) to (19), L layer is equably with orthogonal
Mode is shared in the running time-frequency resource among each Resource Block, therefore,Only there is TW/L individual non-
Zero row.(W is necessary for the multiple of L), setsForNon-zero column composition
(NT/ L) × (TW/L) submatrix of tieing up.By appropriate designSo thatJust have
The row handed over, that is,：
(note:Formula (26) is only in NTCai feasible under/W≤T), in order to meet formula (26)
Require, so design { Ct,l}：Define the unit matrix that U ties up for (TW/L) × (TW/L).With { cs,t,l,
S=1～S } represent Ct,lRow, as follows design cs,t,l, that is,：
Among formula (27), [cs,t,l|(t,w)∈Rl] for meeting (t, w) ∈ RlCs,t,lAs row institute
The matrix of composition.Will be by formula (17) to sequence of mapping produced by (19) with by formula (27)
(28) produced simulation pre-coding matrix combines and can simply find out very much formula (26)
Requirement be satisfied.
For simplicity, the design rule of simulation pre-coding matrix and sequence of mapping is summarized as
Below some：
W and T is selected to make W≤min (Wcoh, S) and NT/W≤T≤TcohAnd W also should
Integral multiple for L；
Using formula (17), sequence of mapping { b is produced to (19) to L layert,w,l}；And
Using formula (27) and (28) come to L layer calculating simulation pre-coding matrix { Ct,l}.
It is obvious to a person skilled in the art that the invention is not restricted to above-mentioned exemplary implementation
The details of example, and without departing from the spirit or essential characteristics of the present invention, can be with
Other concrete forms realize the present invention.Therefore, from the point of view of anyway, embodiment all should be seen
Work is exemplary, and is nonrestrictive.Additionally, it will be evident that " inclusion " one word is not arranged
Except other elements and step, and wording " one " is not excluded for plural number.Old in device claim
The multiple element stated can also be realized by an element.The first, the second grade word is used for representing
Title, and it is not offered as any specific order.
Claims (12)
1. a kind of estimate for downlink channel in the base station of MIMO radio communication system
The method of meter, wherein, has N among the base station of described MIMO radio communication systemTIndividual
Antenna and NFFTIndividual subcarrier, methods described includes：
- by from each radio frequency link pilot signal by means of with each radio frequency link described
The first associated simulation pre-coding matrix carries out precoding to obtain the first pilot signal；And
- the first pilot signal through precoding is mapped to each radio frequency link described even
All antennas of connecing and being transmitted by described antenna.
2. method according to claim 1, wherein, from leading of different radio frequency links
Frequency signal is transmitted by means of different OFDM symbol.
3. method according to claim 1, wherein, through the first pilot tone letter of precoding
Number will be transmitted by all antennas being connected with each radio frequency link described simultaneously.
4. method according to claim 1, wherein, the rf chain that used by this base station
Quantity S on road is less than quantity N of antennaT.
5. method according to claim 4, wherein, by this base station from penetrating that it is used
The transmission that quantity is that s≤S radio frequency link is used for pilot signal is selected in quantity S of frequency link.
6. method according to claim 1, wherein, methods described further includes：
- to comprising T OFDM symbol and NFFTThe running time-frequency resource of individual subcarrier carries out subregion
To obtain the time/frequency source block of the running time-frequency resource unit comprising equal number；
- pilot signal among each time/frequency source block is adopted and described time/frequency source block phase
Second simulation pre-coding matrix of association carries out precoding to obtain the second pilot signal；And
- the second pilot signal through precoding is mapped to each radio frequency link described even
All antennas of connecing and being transmitted by described antenna.
7. method according to claim 6, wherein, described second simulation pre-coding matrix
In corresponding different antennae often row mutually orthogonal each other.
8. a kind of base being used for Downlink channel estimation in MIMO radio communication system
Stand, wherein, described base station is characterised by implementing according to any one in claim 1 to 7
Described method.
9. a kind of downlink that is used in the user equipment of MIMO radio communication system is believed
The method that road is estimated, methods described includes：
- receive the first pilot signal from the base station being connected with described user equipment, wherein, described
First pilot signal is derived from each radio frequency link, is associated by means of with each radio frequency link described
The first simulation pre-coding matrix carry out precoding, be mapped to and each radio frequency link described even
All antennas of connecing and being transmitted by described antenna；And
- described user equipment carries out time delay estimation according to described first pilot signal.
10. method according to claim 9, wherein, methods described further includes：
- receive the second pilot signal from the base station being connected with described user equipment, wherein, described
Second pilot signal is to comprising T OFDM symbol and NFFTThe running time-frequency resource of individual subcarrier
Carry out piecemeal to obtain comprising the time/frequency source block of the running time-frequency resource unit of equal number and right
Pilot signal among each time/frequency source block is using the being associated with described time/frequency source block
Two simulation pre-coding matrixes are carried out precoding, are mapped to and are connected with each radio frequency link described
All antennas and be transmitted by described antenna and obtain the second pilot signal；And
- described user equipment carries out channel estimation according to described second pilot signal.
11. methods according to claim 10, wherein, described user equipment is always according to institute
State time delay to estimate to carry out assisted channel estimation.
12. users being used for Downlink channel estimation in MIMO radio communication system set
Standby, wherein, described base station is characterised by implementing according to any one in claim 9 to 11
Method described in.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510466291.8A CN106411794B (en) | 2015-07-31 | 2015-07-31 | Method for Downlink channel estimation |
| PCT/IB2016/001176 WO2017021775A1 (en) | 2015-07-31 | 2016-06-30 | Method for downlink channel estimation |
| TW105121571A TW201720073A (en) | 2015-07-31 | 2016-07-07 | Method for downlink channel estimation |
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|---|---|---|---|
| CN201510466291.8A CN106411794B (en) | 2015-07-31 | 2015-07-31 | Method for Downlink channel estimation |
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| CN106411794A true CN106411794A (en) | 2017-02-15 |
| CN106411794B CN106411794B (en) | 2019-09-13 |
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| CN201510466291.8A Active CN106411794B (en) | 2015-07-31 | 2015-07-31 | Method for Downlink channel estimation |
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| WO2018171438A1 (en) * | 2017-03-24 | 2018-09-27 | 电信科学技术研究院有限公司 | Method and apparatus for transmitting diversity in multi-antenna communication system |
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| CN113300745B (en) * | 2021-05-18 | 2022-06-03 | 西安电子科技大学 | Method for eliminating depolarization effect interference of dual-polarization dual-frequency fusion system |
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| US20090232239A1 (en) * | 2008-03-12 | 2009-09-17 | Lg Electronics Inc. | Method and apparatus for transmitting a pilot in multi-antenna system |
| CN102668401A (en) * | 2009-09-25 | 2012-09-12 | 英特尔公司 | Non-unitary precoding scheme for wireless communications |
| US20130089009A1 (en) * | 2011-09-19 | 2013-04-11 | Li Erran Li | Method and apparatus for interference cancellation for antenna arrays |
| CN104486044A (en) * | 2014-12-30 | 2015-04-01 | 北京航空航天大学 | Broadband module mixing pretreatment method for large-scale MIMO system |
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| KR101328281B1 (en) * | 2007-01-12 | 2013-11-14 | 삼성전자주식회사 | Method and apparatus for operating control channel in multiple input multiple output system |
| KR101499255B1 (en) * | 2008-03-12 | 2015-03-06 | 엘지전자 주식회사 | Method of transmitting pilot in multiple antenna system |
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| US20090232239A1 (en) * | 2008-03-12 | 2009-09-17 | Lg Electronics Inc. | Method and apparatus for transmitting a pilot in multi-antenna system |
| CN102668401A (en) * | 2009-09-25 | 2012-09-12 | 英特尔公司 | Non-unitary precoding scheme for wireless communications |
| US20130089009A1 (en) * | 2011-09-19 | 2013-04-11 | Li Erran Li | Method and apparatus for interference cancellation for antenna arrays |
| CN104486044A (en) * | 2014-12-30 | 2015-04-01 | 北京航空航天大学 | Broadband module mixing pretreatment method for large-scale MIMO system |
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| WO2018171438A1 (en) * | 2017-03-24 | 2018-09-27 | 电信科学技术研究院有限公司 | Method and apparatus for transmitting diversity in multi-antenna communication system |
| CN108631834A (en) * | 2017-03-24 | 2018-10-09 | 电信科学技术研究院 | A kind of method and device of the transmitting diversity in multiple antenna communication |
| CN108631834B (en) * | 2017-03-24 | 2020-12-04 | 电信科学技术研究院 | Method and device for transmitting diversity in multi-antenna communication system |
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| CN106411794B (en) | 2019-09-13 |
| WO2017021775A1 (en) | 2017-02-09 |
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