CN103973601B - Channel estimation method and device for downlink data transmission - Google Patents
Channel estimation method and device for downlink data transmission Download PDFInfo
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- CN103973601B CN103973601B CN201310028666.3A CN201310028666A CN103973601B CN 103973601 B CN103973601 B CN 103973601B CN 201310028666 A CN201310028666 A CN 201310028666A CN 103973601 B CN103973601 B CN 103973601B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
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Abstract
The invention provides a channel estimation method and device for downlink data transmission. The method comprises the steps of receiving downlink data, wherein the downlink data bear a PDSCH, a pilot signal used for estimating equivalent channel values and a pilot signal used for estimating physical channel values; according to the pilot signal used for estimating the equivalent channel values, estimating the equivalent channel values of a resource block on the resource block bearing the PDSCH; according to the pilot signal used for estimating the physical channel values, estimating the physical channel value of each carrier wave and the physical channel value of the resource block on the resource block bearing the PDSCH; according to the equivalent channel values of the resource block and the physical channel value of the resource block, determining a precoding matrix of the resource block; according to the physical channel value of each carrier and the precoding matrix of the resource block, determining the equivalent channel value of each carrier wave. According to the channel estimation method and device for downlink data transmission, the influence on channel estimation from the Doppler effect can be reduced, and the estimation accuracy of downlink data transmission can be improved.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of channel estimation methods and device of downlink data transmission.
Background technology
Cell specific pilot signal is introduced in Long Term Evolution agreement R8 version (LTE R8, Long Term Evolution)
(CRS, Cell-specific Reference Signal) carries out downlink data demodulation channel measurement, and which needs to carry out
The notice of pre-coding matrix.Introduce single layer data demodulated pilot signal (DMRS, DeModulation in LTE R8 simultaneously
Reference Signal) carry out the wave beam forming of single port.Introduce two layer data demodulated pilot signals in LTE R9 in addition
To carry out the wave beam forming of dual-port.Channel condition information pilot signal (CSI-RS, Channel-State are introduced in LTE R10
Information Reference Signal) carry out downlink data demodulation channel measurement.
For the data demodulated pilot signal of multilayer, layer and layer different orthogonal frequency division multiplexing (OFDM,
Orthogonal Frequency Division Multiplexing) code division multiplexing is carried out on symbol, as shown in Figure 1.It is same
The DMRS not in the same time of carrier wave adopts code division multiplexing (CDM, Code Division Multiplexing) mode.Due to how general
The reason for strangling effect causes channel value not in the same time to have differences, so as to affect the precision of channel estimation of CDM modes.
By taking two-layer data transfer model as an example, illustrate that equivalent channel is estimated.Shown in data transmit-receive relation such as formula (1)：
Wherein, equation left side matrix for receiving matrix, behavior reception antenna, be classified as the time of reception；Right side H is physics letter
Road matrix, w is pre-coding matrix, and H*w is equivalent channel matrix F；The matrix of the rightmost side be DMRS code division matrixes, comprising it is adjacent when
DMRS sequences S1 at quarter and S2, and orthogonal sequenceFrom formula (1), the estimate of equivalent channel can be by receiving square
Take advantage of DMRS code division inverse of a matrix matrixes in the battle array right sideObtain.But when the premise that equivalent channel can be estimated is adjacent
Physical channel matrix H at quarter is constant.If physical channel changes in adjacent moment, the estimate and actual value of equivalent channel
Between have differences.In fact, because translational speed causes Doppler effect, the channel in each OFDM symbol to be implicitly present in difference
It is different.As shown in Figures 2 and 3, so that between the estimate and actual value in single footpath channel simulator of 3km translational speeds, difference is maximum
10^ (- 2) is can reach, this species diversity affects very big in multilayer transmission on the demodulation of data.
The content of the invention
The present invention proposes a kind of channel estimation methods and device of downlink data transmission, to solve prior art in Doppler
The reason for effect, causes channel value not in the same time to have differences the technical problem for affecting precision of channel estimation.
Embodiments of the invention provide a kind of channel estimation methods of downlink data transmission, including：Downlink data is received, under
Row Deta bearer PDSCH, the pilot signal for estimating physical channel value and the pilot signal for estimating physical channel value；Root
According to for estimating the pilot signal of physical channel value, the estimating resource block equivalent channel value on the Resource Block for carrying PDSCH；According to
For estimating the pilot signal of physical channel value, on the Resource Block for carrying PDSCH each carrier wave physical channel value and resource are estimated
Block physical channel value；According to Resource Block equivalent channel value and Resource Block physical channel value, Resource Block pre-coding matrix is determined；And
The equivalent channel value of each carrier wave is determined according to each carrier wave physical channel value and Resource Block pre-coding matrix.
Wherein, the span of Resource Block equivalent channel value is determined according to the downlink transfer number of plies.
When reception antenna and transmission antenna amount not etc. when, determined according to the agreement to Resource Block pre-coding matrix Partial Elements
Resource Block pre-coding matrix.When transmission antenna is 4 and reception antenna is 2, in preferred agreement Resource Block pre-coding matrix
Front two row element is fixed value or certain the group data in agreement multi-group data by by signaling.
When for estimating the pilot signal of physical channel value being CRS, carrier wave physical channel value is equal to CRS places carrier wave and connects
Receive data and be multiplied by the conjugation of CRS code division matrixes, Resource Block physical channel value is equal to the flat of each carrier wave physical channel value on Resource Block
Average.
For estimate physical channel value pilot signal be CSI-RS when, carrier wave physical channel value be equal to CSI-RS be located carry
The receiving data of ripple is multiplied by the conjugation of CSI-RS code division matrixes, and Resource Block physical channel value is equal to each carrier wave physics letter on Resource Block
The mean value of road value.
For estimate physical channel value pilot signal be CRS and CSI-RS when, carrier wave physical channel value be equal to CRS carrier waves
The weighted average of physical channel value and CSI-RS carrier wave physical channel values, CRS carrier wave physical channels value is equal to CRS places carrier wave
Receiving data is multiplied by the conjugation of CRS code division matrixes, and CSI-RS carrier wave physical channels value is equal to the reception number of CSI-RS places carrier wave
According to the conjugation for being multiplied by CSI-RS code division matrixes.Average weighted weight determines according to signal and the ratio of interference.Resource Block physics
Channel value is equal to the mean value of each carrier wave physical channel value on Resource Block.It is preferred that, measure this cell pilots receiving power and
Each adjacent cell pilot signal reception power, and according to this cell pilots receiving power and each adjacent cell pilot signal reception work(
Rate determines the weight of the weight of CRS carrier wave physical channel values and CSI-RS carrier wave physical channel values.CRS carrier wave physical channel values
Weight be this cell pilots receiving power with adjacent cell pilot signal reception power and ratio, CSI-RS carrier waves physics letter
The weight of road value be this cell pilots receiving power with adjacent cell pilot signal reception power and ratio plus 1.
Embodiments of the invention also provide a kind of channel estimating apparatus of downlink data transmission, including：Receiving unit, is used for
Downlink data is received, downlink data carries PDSCH, the pilot signal for estimating physical channel value and for estimating physical channel
The pilot signal of value；Equivalent channel estimation unit, for according to being used to estimate the pilot signal of physical channel value, carrying
Estimating resource block equivalent channel value on the Resource Block of PDSCH；Physical channel estimation unit, is used to estimate physical channel for basis
The pilot signal of value, on the Resource Block for carrying PDSCH each carrier wave physical channel value and Resource Block physical channel value are estimated；Prelist
Code determining unit, for according to Resource Block equivalent channel value and Resource Block physical channel value, determining Resource Block pre-coding matrix；With
And equivalent channel determining unit, for according to each carrier wave physical channel value and Resource Block pre-coding matrix determine each carrier wave etc.
Effect channel value.
Wherein equivalent channel estimation unit determines the span of Resource Block equivalent channel value according to the downlink transfer number of plies.
When reception antenna and transmission antenna amount not etc. when, precoding determining unit is according to Resource Block pre-coding matrix part
The agreement of element determines Resource Block pre-coding matrix.When transmission antenna is 4 and reception antenna is 2, preferably arrange resource
Front two row element is fixed value or certain the group data in agreement multi-group data by by signaling in block pre-coding matrix.
For estimate physical channel value pilot signal be CRS when, physical channel estimation unit includes：First calculates mould
Block, for calculating carrier wave physical channel value, carrier wave physical channel value is equal to the receiving data of CRS places carrier wave and is multiplied by CRS code divisions
The conjugation of matrix；And second computing module, for computing resource block physical channel value, Resource Block physical channel value is equal to resource
The mean value of each carrier wave physical channel value on block.
For estimate physical channel value pilot signal be CSI-RS when, physical channel estimation unit includes：First calculates
Module, for calculating carrier wave physical channel value, carrier wave physical channel value is equal to the receiving data of CSI-RS places carrier wave and is multiplied by
The conjugation of CSI-RS code division matrixes；Second computing module, for computing resource block physical channel value, Resource Block physical channel value etc.
The mean value of each carrier wave physical channel value on Resource Block.
For estimate physical channel value pilot signal be CRS and CSI-RS when, physical channel estimation unit includes：Weight
Determining module, for determining CRS carrier wave physical channel values and CSI-RS carrier wave physical channel values according to the ratio of signal and interference
Weight；First computing module, for calculating carrier wave physical channel value, carrier wave physical channel value is equal to CRS carrier wave physical channels
The weighted average of value and CSI-RS carrier wave physical channel values, CRS carrier wave physical channels value is equal to the receiving data of CRS places carrier wave
The conjugation of CRS code division matrixes is multiplied by, CSI-RS carrier wave physical channels value is equal to the receiving data of CSI-RS places carrier wave and is multiplied by
The conjugation of CSI-RS code division matrixes；Second computing module, for computing resource block physical channel value, Resource Block physical channel value etc.
The mean value of each carrier wave physical channel value on Resource Block.It is preferred that, the device also includes power measurement unit, little for measuring
Area's pilot signal reception power and each adjacent cell pilot signal reception power.Weight determination module connects according to this cell pilots
Receive power and each adjacent cell pilot signal reception power determines the weight and CSI-RS carrier waves physics letter of CRS carrier wave physical channel values
The weight of road value.It is preferred that, the weight of CRS carrier wave physical channel values is that this cell pilots receiving power is believed with adjacent cell pilot tone
The ratio of number receiving power sum；The weight of CSI-RS carrier wave physical channel values is this cell pilots receiving power and adjacent cell
The ratio of pilot signal reception power sum adds 1.
The present invention can reduce Doppler effect to believing by using DMRS, CSI-RS and CRS carrying out channel estimation simultaneously
The impact that road is estimated, improves downlink data transmission estimated accuracy.
Description of the drawings
The inventive concept of the present invention below by being described with reference to the accompanying drawings and will be introduced, and wherein accompanying drawing includes：
Fig. 1 represents CRS the and DMRS mapping graphs in generic downlink subframe；
Fig. 2 represents the real part disparity map in the emulation of 3km time varying channels between the estimate and actual value of equivalent channel；
Fig. 3 represents the imaginary part disparity map in the emulation of 3km time varying channels between the estimate and actual value of equivalent channel；
Fig. 4 is the flow chart of the channel estimation methods of the downlink data transmission that the embodiment of the present invention one is provided；
Fig. 5 is the flow chart of the channel estimation methods of the downlink data transmission that the embodiment of the present invention two is provided；
Fig. 6 is the flow chart of the channel estimation methods of the downlink data transmission that the embodiment of the present invention three is provided；
Fig. 7 is the flow chart of the channel estimation methods of the downlink data transmission that the embodiment of the present invention four is provided；
Fig. 8 is the structural representation of the channel estimating apparatus of the downlink data transmission that the embodiment of the present invention five is provided.
Specific embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, the preferred embodiment of this part description is only used for
The description and interpretation present invention, is not intended to limit the present invention.
Embodiment one
The present embodiment provides a kind of channel estimation methods of downlink data transmission, is applied to user equipment (UE, User
Equipment) being subsequently demodulated and detect.As shown in figure 4, the method includes：
Step S401：Downlink data is received, downlink data carries PDSCH, the pilot signal for estimating physical channel value
With for estimating the pilot signal of physical channel value.
Step S402：According to being used to estimate the pilot signal of physical channel value, money is estimated on the Resource Block for carrying PDSCH
Source block equivalent channel value.
In this step, for estimating that the pilot signal of physical channel value is DMRS, and according to the downlink data transmission number of plies
Determine the span of the Resource Block equivalent channel value.For example transmitting antenna is 4, and reception antenna is 2, downlink data transmission
When the number of plies is 2, equivalent channel matrix F is 2 × 4 matrixes, but only two emission ports participate in the estimation of equivalent channel, i.e., actually
The equivalent matrix F estimated is 2 × 2 matrixes.
Step S403：According to being used to estimate the pilot signal of physical channel value, estimate each on the Resource Block for carrying PDSCH
Carrier wave physical channel value and Resource Block physical channel value.
In this step, can be CRS for estimating the pilot signal of physical channel value, carrier wave physical channel value is equal to
The receiving data of CRS places carrier wave is multiplied by the conjugation of CRS code division matrixes, and Resource Block physical channel value is equal to each carrier wave on Resource Block
The mean value of physical channel value.
For estimating that the pilot signal of physical channel value can be CSI-RS, carrier wave physical channel value is located equal to CSI-RS
The receiving data of carrier wave is multiplied by the conjugation of CSI-RS code division matrixes, and Resource Block physical channel value is equal to each carrier wave physics on Resource Block
The mean value of channel value.
For estimating that the pilot signal of physical channel value can also be CRS and CSI-RS, carrier wave physical channel value is equal to CRS
The weighted average of carrier wave physical channel value and CSI-RS carrier wave physical channel values, weight can be true according to the ratio of signal and interference
It is fixed.CRS carrier wave physical channels value is equal to the conjugation that the receiving data of CRS places carrier wave is multiplied by CRS code division matrixes, CSI-RS carrier waves
Physical channel value is equal to the conjugation that the receiving data of CSI-RS places carrier wave is multiplied by CSI-RS code division matrixes.Resource Block physical channel
Mean value of the value equal to each carrier wave physical channel value on Resource Block.Wherein, this cell pilots receiving power and each neighbour are measured
Cell pilots receiving power, and it is true according to this cell pilots receiving power and each adjacent cell pilot signal reception power
Determine the weight of CRS carrier wave physical channel values and the weight of CSI-RS carrier wave physical channel values.It is preferred that, CRS carrier wave physical channel values
Weight be this cell pilots receiving power with adjacent cell pilot signal reception power and ratio, CSI-RS carrier wave physics
The weight of channel value be this cell pilots receiving power with adjacent cell pilot signal reception power and ratio plus 1.
Step S404：According to Resource Block equivalent channel value and Resource Block physical channel value, Resource Block pre-coding matrix is determined.
In this step, Resource Block pre-coding matrix is multiplied by the equivalent letter of Resource Block equal to the inverse matrix of Resource Block physical channel
Road matrix.
Additionally, when reception antenna and transmission antenna amount not etc. when, according to the pact to Resource Block pre-coding matrix Partial Elements
Surely Resource Block pre-coding matrix is determined.For example, when transmission antenna is 4, reception antenna is 2, and the downlink data transmission number of plies is 2
When, Resource Block equivalent channel matrix FRBFor 2 × 2 matrixes, Resource Block physical channel HRBFor 2 × 4 matrixes, Resource Block precoding square
Battle array WRBEqual to 4 × 2 matrixes.Now, due to HRBIrreversible, linear equation number is less than unknown number number, thus cannot ask and obtain
The pre-coding matrix of transmitting terminal.Now, arrange front two row element in Resource Block pre-coding matrix to be fixed value or arrange multigroup number
Certain group data according in are by by signaling, solving the Resource Block pre-coding matrix for drawing correspondence Resource Block.
Step S405：The equivalent channel of each carrier wave is determined according to each carrier wave physical channel value and Resource Block pre-coding matrix
Value.
Limit without order between step S402 and step S403 in the present embodiment, can simultaneously carry out or successively carry out.
The present embodiment can reduce Doppler effect pair by using DMRS, CSI-RS and CRS carrying out channel estimation simultaneously
The impact of channel estimation, improves downlink data transmission estimated accuracy.
Embodiment two
The present embodiment provides a kind of channel estimation methods of downlink data transmission.The method is applied to UE, its concrete scene
It is that transmitting antenna and reception antenna number are 4, CRS, PDSCH and DMRS, the number of plies of downlink data transmission is carried on descending sub frame
For 2, this two-layer correspond to respectively port 7 (port7) and port 8 (port8).As shown in figure 5, the method includes：
Step S501：Descending sub frame is received, it carries PDSCH, DMRS and CRS.
Step S502：Equivalent channel F is estimated by granularity of RB according to DMRSRB.In the step, the relational expression for utilizing is as follows
Wherein equation left side is equivalent channel matrix F, and its behavior reception antenna is classified as emission port, and equation right side is to connect
Receive matrix Y and DMRS code division inverse of a matrix matrix.DMRS code divisions matrix can be multiplexed the information of four ports, and base station only exists
Port7 and port8 transmitting datas belong to interference port and are not involved in W estimations to the port outside UE, port7 and port8
Computing.Therefore, two layer datas are only used during actual estimation, such as front two-layer, i.e.,
Step S503：Physical channel value H is estimated by granularity of RB according to CRSRB.In this step, the relational expression for utilizing is such as
Under：
Hsc=Y × conj (X) formula (2-2)
HRB=mean (Hsc) formula (2-3)
Wherein, Hsc represents the physical channel value on the carrier wave of CRS places, and Y represents the receiving data of CRS places carrier wave, and X is
CRS pilot frequency sequences.
Step S504：According to FRBAnd HRBObtain pre-coding matrix W on correspondence RBRB.In the step, the relational expression for utilizing is such as
Under:
WRB=inv (HRB)×FRBFormula (2-4)
Step S505：According to Hsc and WRBDetermine carrier wave equivalent channel value FSC.In the step, the relational expression for utilizing is as follows:
FSC=HSC×WRBFormula (2-5)
In the present embodiment, limit without order between step S502 and step S503, can simultaneously carry out or successively carry out,
FRBSolution formula be not limited to formula (2-1), HRBSolution formula be not limited to formula (2-3).
The present invention passes through that while using DMRS and CRS carry out channel estimation, Doppler effect can be reduced to channel estimation
Impact, improve downlink data transmission estimated accuracy.
Embodiment three
The present embodiment provides a kind of channel estimation methods of downlink data transmission.The method is applied to UE, its concrete scene
It is that transmitting antenna and reception antenna number are 2, CRS, CSI-RS, DMRS and PDSCH, this cell and adjacent is carried on descending sub frame
Cell will not place business datum in CSI-RS positions, and the number of plies of downlink data transmission is 1, correspond to port 7 (port7).Such as
Shown in Fig. 6, the method includes：
Step S601：Descending sub frame is received, it carries PDSCH, DMRS, CSI-RS and CRS.
Step S602：Equivalent channel F is estimated by granularity of RB according to DMRSRB。
The step is similar to step S502 in embodiment two, and according to formula (2-1) F is solvedRB.Difference is equivalent channel square
Battle array F, receiving matrix Y and DMRS code division inverse of a matrix matrix are all 2 × 2 matrixes.In the same manner, a layer data is only used during actual estimation,
Such as ground floor, i.e.,
Step S603：Physical channel H is estimated by granularity of RB according to CRS and CSI-RSRB。
In this step, due to can simultaneously be obtained by the physics letter that CRS and CSI-RS estimates at CSI-RS positions
Road value, therefore can be by obtaining to CRS physical channels estimate Hcrs and CSI-RS physical channel estimate Hcsi weighted averages
Physical channel estimate Hfinal on the carrier wave of CSI-RS places.
Hcrs and Hcsi is solved according to relationship below：
Hcrs=Y × conj (Xcrs) formula (3-1)
Hcsi=Y × conj (Xcsi) formula (3-2)
Wherein, Hcrs represents CRS physical channel estimates, and Hcsi mark CSI physical channel estimates, Y represents carrier wave
Receiving data, Xcrs represents CRS pilot frequency sequences, and Xcsi represents CSI pilot frequency sequences.
Average weighted weight can be determined with signal and the ratio of interference.Such as UE can measure this cell and adjacent cell
The linear value of pilot signal reception power (RSRP, Reference Signal Receiving Power), the RSRP of this cell
Linear value is designated as RSRPsrv, and adjacent cell RSRP linear value sum is designated as the ratio of RSRPsum, RSRPsrv and RSRPsum and is designated as
Rsir.Physical channel estimate Hfinal and H on the carrier wave of CSI-RS placesRBDetermined according to following formula：
Hfinal=((Rsir+1) × Hcsi+Rsir × Hcrs)/(2Rsir+1) formula (3-3)
HRB=mean (Hfinal) formula (3-4)
Step S604：According to FRBAnd HRBObtain the W on correspondence RBRB.The relational expression that the step is utilized is formula (2-4)
Step S605：According to each Hfinal and WRBDetermine carrier wave equivalent channel value Ffinal.In the step, the relation for utilizing
Formula is as follows:
Ffinal=Hfinal × WRBFormula (3-5)
In the present embodiment, limit without order between step S602 and step S603, can simultaneously carry out or successively carry out,
FRBSolution formula be not limited to formula (2-1), the solution formula of Hfinal is not limited to formula (3-3), HRBSolution formula be not limited to formula
(3-4)。
The present embodiment can reduce Doppler effect pair by using DMRS, CSI-RS and CRS carrying out channel estimation simultaneously
The impact of channel estimation, improves downlink data transmission estimated accuracy.
Example IV
The present embodiment provides a kind of channel estimation methods of downlink data transmission.The method is applied to UE, its concrete scene
It is that transmitting antenna and reception antenna number are respectively 4 and 2, CRS, DMRS and PDSCH, the number of plies of downlink transfer is carried on descending sub frame
For 2, port7 and port8 is corresponded to respectively.As shown in fig. 7, the method includes：
Step S701：Descending sub frame is received, it carries PDSCH, DMRS and CRS.And
Step S702：Equivalent channel F is estimated by granularity of RB according to DMRSRB.In the step, the relational expression for utilizing is as follows：
Wherein equation left side is equivalent channel matrix F, and its behavior reception antenna is classified as emission port, and equation right side is to connect
Receive matrix Y and DMRS code division inverse of a matrix matrix.DMRS code divisions matrix can be multiplexed the information of four ports, and base station only exists
Port7 and port8 transmitting datas belong to interference port and are not involved in W estimations to the port outside UE, port7 and port8
Computing.Therefore, two layer datas are only used during actual estimation, such as front two-layer, i.e.,
Step S703：Physical channel value H is estimated by granularity of RB according to CRSRB.Step in the step and embodiment two
S503 is identical.
Step S704：According to FRBAnd HRBObtain pre-coding matrix W on correspondence RBRB.FRB be 2 × 2 matrixes, Resource Block physics
Channel HRBFor 2 × 4 matrixes, Resource Block pre-coding matrix WRB is equal to 4 × 2 matrixes.Now, due to HRBIt is irreversible, linear equation
Number is less than unknown number number, thus cannot seek the pre-coding matrix for obtaining transmitting terminal.Now, Resource Block pre-coding matrix is arranged
Middle front two row element be fixed value or certain the group data in agreement multi-group data by by signaling (as using the PMI in DCI
Indication field), the Resource Block pre-coding matrix for drawing correspondence Resource Block can be solved.
Step S705：According to carrier wave physical channel value Hsc and WRBDetermine carrier wave equivalent channel value FSC.The step and enforcement
Step S505 in example two is identical.
In the present embodiment, limit without order between step S702 and step S703, can simultaneously carry out or successively carry out,
FRBSolution formula be not limited to formula (7-1), HRBSolution formula be not limited to formula (2-3).
The present invention passes through that while using DMRS and CRS carry out channel estimation, Doppler effect can be reduced to channel estimation
Impact, improve downlink data transmission estimated accuracy.
Embodiment five
The present embodiment provides a kind of channel estimating apparatus of downlink data transmission, such as user equipment (UE, User
Experience).As shown in figure 8, the device includes：
Receiving unit 810, for receiving downlink data, downlink data carries PDSCH, for estimating leading for physical channel value
Frequency signal and the pilot signal for estimating physical channel value；
Equivalent channel estimation unit 820, for according to being used to estimate the pilot signal of physical channel value, carrying PDSCH
Resource Block on estimating resource block equivalent channel value；
Physical channel estimation unit 830, for according to being used to estimate the pilot signal of physical channel value, carrying PDSCH
Resource Block on estimate each carrier wave physical channel value and Resource Block physical channel value；
Precoding determining unit 840, for according to Resource Block equivalent channel value and Resource Block physical channel value, determining resource
Block pre-coding matrix；And
Equivalent channel determining unit 850, it is every for being determined according to each carrier wave physical channel value and Resource Block pre-coding matrix
The equivalent channel value of individual carrier wave.
Wherein, equivalent channel estimation unit 820, according to the downlink transfer number of plies value model of Resource Block equivalent channel value is determined
Enclose.Such as transmitting antenna is 4, and reception antenna is 2, when the downlink data transmission number of plies is 2, and equivalent channel matrix F is 2 × 4 squares
Battle array, but the estimation of only two emission port participation equivalent channels, i.e., the equivalent matrix F actually estimated is 2 × 2 matrixes.
Physical channel estimation unit 830 includes the first computing module for calculating carrier wave physical channel value and for calculating
Second computing module of Resource Block physical channel value.Resource Block physical channel value is equal to each carrier wave physical channel value on Resource Block
Mean value.
When for estimating the pilot signal of physical channel value being CRS, carrier wave physical channel value is equal to CRS places carrier wave and connects
Receive the conjugation that data are multiplied by CRS pilot frequency sequences.
For estimate physical channel value pilot signal be CSI-RS when, carrier wave physical channel value be equal to CSI-RS be located carry
The receiving data of ripple is multiplied by the conjugation of CSI-RS pilot frequency sequences.
For estimate physical channel value pilot signal be CRS and CSI-RS when, physical channel estimation unit 830 also includes
Weight determination module, for determining that CRS carrier wave physical channel values are believed with CSI-RS carrier waves physics according to the ratio of signal and interference
The weight of road value.Carrier wave physical channel value is equal to CRS carrier wave physical channel values and puts down with the weighting of CSI-RS carrier wave physical channel values
, wherein, CRS carrier wave physical channels value is equal to the receiving data of CRS places carrier wave and is multiplied by the conjugation of CRS pilot frequency sequences, CSI-
RS carrier wave physical channels value is equal to the conjugation that the receiving data of CSI-RS places carrier wave is multiplied by CSI-RS pilot frequency sequences.
Now, the device also includes power measurement unit, little for measuring this cell pilots receiving power and each neighbour
Area's pilot signal reception power.Weight determination module connects according to this cell pilots receiving power and each adjacent cell pilot signal
Receive power and determine the weight of CRS carrier wave physical channel values and the weight of CSI-RS carrier wave physical channel values.It is preferred that, CRS carrier wave things
The weight of reason channel value be this cell pilots receiving power with adjacent cell pilot signal reception power and ratio；CSI-RS
The weight of carrier wave physical channel value be this cell pilots receiving power with adjacent cell pilot signal reception power and ratio
Plus 1.
When reception antenna and transmission antenna amount not etc. when, precoding determining unit 840 is according to Resource Block pre-coding matrix
The agreement of Partial Elements determines Resource Block pre-coding matrix.For example, when transmission antenna is 4, reception antenna is 2, and downlink data
When the transmission number of plies is 2, Resource Block equivalent channel matrix FRBFor 2 × 2 matrixes, Resource Block physical channel HRBFor 2 × 4 matrixes, resource
Block pre-coding matrix WRBEqual to 4 × 2 matrixes.Now, due to HRBIrreversible, linear equation number is less than unknown number number, thus
The pre-coding matrix for obtaining transmitting terminal cannot be sought.Now, arrange Resource Block pre-coding matrix in front two row element be fixed value or
Certain group data in agreement multi-group data are by by signaling, solving the Resource Block precoding square for drawing correspondence Resource Block
Battle array.
The present embodiment can reduce Doppler effect pair by using DMRS, CSI-RS and CRS carrying out channel estimation simultaneously
The impact of channel estimation, improves downlink data transmission estimated accuracy.
Claims (18)
1. a kind of channel estimation methods of downlink data transmission, it is characterised in that the channel estimation methods include：
Receive downlink data, the downlink data carries Physical Downlink Shared Channel PDSCH, for estimating leading for physical channel value
Frequency signal and the pilot signal for estimating equivalent channel value；
According to the pilot signal for estimating equivalent channel value, in the money for carrying the Physical Downlink Shared Channel PDSCH
Estimating resource block equivalent channel value in source block；
According to the pilot signal for estimating physical channel value, on the Resource Block for carrying the PDSCH each carrier wave is estimated
Physical channel value and Resource Block physical channel value；
According to the Resource Block equivalent channel value and Resource Block physical channel value, Resource Block pre-coding matrix is determined；And
The equivalent channel value of each carrier wave is determined according to each carrier wave physical channel value and Resource Block pre-coding matrix.
2. channel estimation methods according to claim 1, it is characterised in that：
The span of the Resource Block equivalent channel value is determined according to the downlink data transmission number of plies.
3. channel estimation methods according to claim 1, it is characterised in that：
When reception antenna and transmission antenna amount not etc. when, according to the agreement to Resource Block pre-coding matrix Partial Elements determines
Resource Block pre-coding matrix.
4. channel estimation methods according to claim 3, it is characterised in that：
When transmission antenna is 4 and reception antenna is 2, it is solid to arrange front two row element in the Resource Block pre-coding matrix
Certain group data in definite value or agreement multi-group data are by by signaling.
5. channel estimation methods according to claim 1-4 any one, it is characterised in that：It is described for estimate physics believe
The pilot signal of road value is cell specific pilot signal CRS；
The carrier wave physical channel value is equal to the conjugation that the receiving data of CRS places carrier wave is multiplied by CRS pilot frequency sequences；
The Resource Block physical channel value is equal to the mean value of each carrier wave physical channel value on Resource Block.
6. channel estimation methods according to claim 1-4 any one, it is characterised in that：It is described for estimate physics believe
The pilot signal of road value is channel condition information pilot signal CSI-RS；
The carrier wave physical channel value is equal to the receiving data of CSI-RS places carrier wave and is multiplied by being total to for CSI-RS pilot frequency sequences
Yoke；
The Resource Block physical channel value is equal to the mean value of each carrier wave physical channel value on Resource Block.
7. channel estimation methods according to claim 1-4 any one, it is characterised in that；
The pilot signal for estimating physical channel value is CRS and CSI-RS；
The carrier wave physical channel value is equal to the weighted average of CRS carrier wave physical channel values and CSI-RS carrier wave physical channel values,
The average weighted weight determines according to signal and the ratio of interference；
The CRS carrier waves physical channel value is equal to the conjugation that the receiving data of CRS places carrier wave is multiplied by CRS pilot frequency sequences；
The CSI-RS carrier waves physical channel value is equal to the receiving data of CSI-RS places carrier wave and is multiplied by CSI-RS pilot tone sequences
The conjugation of row；
The Resource Block physical channel value is equal to the mean value of each carrier wave physical channel value on Resource Block.
8. channel estimation methods according to claim 7, it is characterised in that also include：
Measure this cell pilots receiving power and each adjacent cell pilot signal reception power；
Determine that CRS carrier waves physics is believed according to described cell pilots receiving power and each adjacent cell pilot signal reception power
The weight of road value and the weight of CSI-RS carrier wave physical channel values.
9. channel estimation methods according to claim 8, it is characterised in that：
The weight of the CRS carrier waves physical channel value is this cell pilots receiving power and adjacent cell pilot signal reception work(
The ratio of rate sum；
The weight of the CSI-RS carrier waves physical channel value connects for this cell pilots receiving power with adjacent cell pilot signal
The ratio for receiving power sum adds 1.
10. a kind of channel estimating apparatus of downlink data transmission, it is characterised in that the device includes：
Receiving unit, for receiving downlink data, the downlink data carries PDSCH, the pilot tone for estimating physical channel value
Signal and the pilot signal for estimating equivalent channel value；
Equivalent channel estimation unit, for according to the pilot signal for estimating equivalent channel value, carrying the PDSCH
Resource Block on estimating resource block equivalent channel value；
Physical channel estimation unit, for according to the pilot signal for estimating physical channel value, carrying the PDSCH
Resource Block on estimate each carrier wave physical channel value and Resource Block physical channel value；
Precoding determining unit, for according to the Resource Block equivalent channel value and Resource Block physical channel value, determining Resource Block
Pre-coding matrix；And
Equivalent channel determining unit, for determining each load according to each carrier wave physical channel value and Resource Block pre-coding matrix
The equivalent channel value of ripple.
11. channel estimating apparatus according to claim 10, it is characterised in that：
The equivalent channel estimation unit determines the span of the Resource Block equivalent channel value according to the downlink transfer number of plies.
12. channel estimating apparatus according to claim 10, it is characterised in that：
When reception antenna and transmission antenna amount not etc. when, the precoding determining unit is according to Resource Block pre-coding matrix part
The agreement of element determines the Resource Block pre-coding matrix.
13. channel estimating apparatus according to claim 12, it is characterised in that：
When transmission antenna is 4 and reception antenna is 2, it is solid to arrange front two row element in the Resource Block pre-coding matrix
Certain group data in definite value or agreement multi-group data are by by signaling.
14. channel estimating apparatus according to claim 10 to 13 any one, it is characterised in that：It is described for estimating thing
The pilot signal of reason channel value is CRS, and the physical channel estimation unit includes：
First computing module, for calculating carrier wave physical channel value, the carrier wave physical channel value is equal to CRS places carrier wave
Receiving data be multiplied by the conjugation of CRS pilot frequency sequences；And
Second computing module, for computing resource block physical channel value, the Resource Block physical channel value is equal to each on Resource Block
The mean value of carrier wave physical channel value.
15. channel estimating apparatus according to claim 10 to 13 any one, it is characterised in that：It is described for estimating thing
The pilot signal of reason channel value is CSI-RS, and the physical channel estimation unit includes：
First computing module, for calculating carrier wave physical channel value, the carrier wave physical channel value is located equal to the CSI-RS
The receiving data of carrier wave is multiplied by the conjugation of CSI-RS pilot frequency sequences；
Second computing module, for computing resource block physical channel value, the Resource Block physical channel value is equal to each on Resource Block
The mean value of carrier wave physical channel value.
16. devices according to claim 10 to 13 any one, it is characterised in that：
The pilot signal for estimating physical channel value is CRS and CSI-RS, and the physical channel estimation unit includes：
Weight determination module, for determining CRS carrier wave physical channel values and CSI-RS carrier wave things according to the ratio of signal and interference
The weight of reason channel value；
First computing module, for calculating carrier wave physical channel value, the carrier wave physical channel value is equal to CRS carrier wave physical channels
The weighted average of value and CSI-RS carrier wave physical channel values, the CRS carrier waves physical channel value is equal to CRS places carrier wave
Receiving data is multiplied by the conjugation of CRS pilot frequency sequences, and the CSI-RS carrier waves physical channel value is equal to CSI-RS places carrier wave
Receiving data be multiplied by the conjugation of CSI-RS pilot frequency sequences；
Second computing module, for computing resource block physical channel value, the Resource Block physical channel value is equal to each on Resource Block
The mean value of carrier wave physical channel value.
17. channel estimating apparatus according to claim 16, it is characterised in that also include：
Power measurement unit, for measuring this cell pilots receiving power and each adjacent cell pilot signal reception power；
The weight determination module is according to described cell pilots receiving power and each adjacent cell pilot signal reception power
Determine the weight of CRS carrier wave physical channel values and the weight of CSI-RS carrier wave physical channel values.
18. channel estimating apparatus according to claim 17, it is characterised in that：
The weight of the CRS carrier waves physical channel value is this cell pilots receiving power and adjacent cell pilot signal reception work(
The ratio of rate sum；
The weight of the CSI-RS carrier waves physical channel value connects for this cell pilots receiving power with adjacent cell pilot signal
The ratio for receiving power sum adds 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310028666.3A CN103973601B (en) | 2013-01-25 | 2013-01-25 | Channel estimation method and device for downlink data transmission |
| PCT/CN2013/091134 WO2014114176A1 (en) | 2013-01-25 | 2013-12-31 | Downlink data transmission channel estimation method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310028666.3A CN103973601B (en) | 2013-01-25 | 2013-01-25 | Channel estimation method and device for downlink data transmission |
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| CN103973601B true CN103973601B (en) | 2017-04-26 |
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| CN105306116B (en) * | 2015-09-25 | 2019-07-23 | 上海华为技术有限公司 | A kind of determination method and device of the downlink weight vector of multi-user installation |
| CN106559182B (en) * | 2015-09-25 | 2020-06-16 | 中兴通讯股份有限公司 | Method, device and system for obtaining configuration of channel parameters |
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| CN101207600A (en) * | 2006-12-22 | 2008-06-25 | 华为技术有限公司 | Method, system and apparatus for MIMO transmission of multi transmitting antennas |
| WO2011122833A2 (en) * | 2010-03-29 | 2011-10-06 | Lg Electronics Inc. | Method and apparatus for measurement for inter-cell interference coordination in radio communication system |
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| WO2011066671A1 (en) * | 2009-12-04 | 2011-06-09 | Telefonaktiebolaget L M Ericsson (Publ) | Apparatus and method for channel estimation in a wireless communications system |
| CN102859900B (en) * | 2010-04-22 | 2016-02-03 | Lg电子株式会社 | For the method and apparatus of the channel estimating of the wireless link between base station and relay station |
| US8520781B2 (en) * | 2010-07-29 | 2013-08-27 | Blackberry Limited | System and method for channel estimation |
| US8554151B2 (en) * | 2010-12-03 | 2013-10-08 | Qualcomm Incorporated | Method and apparatus for data aided channel quality estimation |
| CN102739593B (en) * | 2011-04-08 | 2014-12-31 | 华为技术有限公司 | Method and base station for sending resource blocks and performing combined channel estimation, and user equipment |
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| CN101207600A (en) * | 2006-12-22 | 2008-06-25 | 华为技术有限公司 | Method, system and apparatus for MIMO transmission of multi transmitting antennas |
| WO2011122833A2 (en) * | 2010-03-29 | 2011-10-06 | Lg Electronics Inc. | Method and apparatus for measurement for inter-cell interference coordination in radio communication system |
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| CN103973601A (en) | 2014-08-06 |
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