CN105264849A

CN105264849A - Chanel estimation method and apparatus

Info

Publication number: CN105264849A
Application number: CN201380002171.1A
Authority: CN
Inventors: 李强
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-10-28
Filing date: 2013-10-28
Publication date: 2016-01-20
Also published as: WO2015061953A1

Abstract

The present invention relates to the technical field of communications, and particularly, to a chanel estimation method and apparatus, so as to solve the technical problem in the prior art that energy leakage of a channel interferes with another channel. In an embodiment of the present invention, after a frequency-domain response estimation sequence is obtained according to a DMRS sequence, the frequency-domain response estimation sequence is directly adjusted according to a virtual time-sequence, so that a multipath time delay is aligned with a time-domain sampling point, and energy leakage of a channel is effectively reduced, and interference to another channel can be avoided.

Description

Chanel estimation method and apparatus

A kind of channel estimation methods and engineering device technique field

The present invention relates to communication technical field, more particularly to a kind of channel estimation methods and device.Background technology

The purpose of channel estimation is to estimate the response of channel during signal transmission（Channel response), the response of channel can be expressed with time-domain expression, can also be expressed with frequency-domain expression, and both are of equal value.

Actual wireless transmission channel is typically a multipath channel, that is to say, that the signal of transmission is to reach receiving terminal by different paths, and the signal received is really the superposition of the signal reached by mulitpath.There are different delays in different paths（), delay also there are different energy losses per paths.

In actual digital communication system, signal is all the sequence in the discrete time after sampling.Channel estimation is also based on the sequence in such discrete time to carry out.Because the time where sampled point can only be that the time delay in every footpath and the time domain sampling point of sequence there may be deviation in some discrete time points, actual channel, the energy " leakage " in every footpath can be caused to arrive the situation of other sampled points.

In multi-antenna systems, there can be multi-layer data simultaneous transmission, so as to improve the spectrum efficiency of system.Receiver needs to carry out channel estimation respectively for each " layer ".Now energy leakage can be impacted to the accuracy of channel estimation.

For example, see Figure 1A, Figure 1B, Fig. 1 C and Fig. 1 D, the contrast of four energy leakages is given, wherein transverse axis is sampled point, and the longitudinal axis is energy value.In Figure 1A, Figure 1B, Fig. 1 C and Fig. 1 D, the time domain response sequence expression formula of channel be, for example, h (.Assuming that the only transmission of a layer data, so can only obtain a channel time domain response estimation.Assuming that^h( ^]JIt is the sequence that a length is 64, in Figure 1A, the multidiameter delay of channel and a time domain sampling point are substantially aligned, so energy is concentrated on this sampled point substantially, in Figure 1B, Fig. 1 C and Fig. 1 D, because the multidiameter delay of channel does not align with time domain sampling point, the energy of channel can be leaked on other sampled points.

The energy leakage of channel can be caused than larger interference for channel estimation.If if multi-stream data simultaneous transmission, the energy of the channel estimation of different data streams can be leaked out, hence for other data The channel estimation of stream is interfered.And there is no preferable scheme to solve the problem in the prior art.The content of the invention

The embodiment of the present invention provides a kind of channel estimation methods and device, for solving the energy leakage of channel estimation in the prior art to causing the technical problem of interlayer interference.

The first aspect of the present invention there is provided a kind of channel estimation methods, including：

Frequency domain response estimation sequence for a transmission channel is obtained according to demodulated reference signal DMRS sequences；

The frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and obtains the first time domain response estimated sequence；

According to the first time domain response estimated sequence, N number of time domain response estimation subsequence for N number of data flow is obtained；N is positive integer；

Estimate subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain N number of channel estimation value for N number of data flow.

With reference in a first aspect, in the first possible implementation, the frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, obtaining the first time domain response estimated sequence, including：

According to the virtual time sequence, M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence；M is the integer not less than 0；

The M+1 frequency domain response subsequence is changed respectively, M+1 time domain response estimated sequence is obtained；

The first time domain response estimated sequence is determined from the M+1 time domain response estimated sequence, the energy leakage value of the first time domain response estimated sequence is less than the energy leakage value of other time domain response estimated sequences.

With reference to the first possible implementation, in second of possible implementation, according to the virtual time sequence, M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence, including：According to the virtual time adjusting step of determination and the length of the frequency domain response estimation sequence, it is based on The frequency domain response estimation sequence obtains the M+1 frequency domain response subsequence；Wherein, the virtual time adjustment shelter states the determination of virtual time sequence.

With reference to second of possible implementation, in the third possible implementation, according to the virtual time adjusting step of determination and the length of the frequency domain response estimation sequence, the M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence, including：According to formula, the M+1 frequency domain response estimation subsequence is obtained；Wherein, The frequency domain response estimation subsequence is represented, the virtual time adjusting step is represented, the frequency domain response estimation sequence is represented, it is the integer from 0 to M that V is taken respectively.With reference to the first possible implementation to the possible implementation of any of the third possible implementation, in the 4th kind of possible implementation, the first time domain response estimated sequence is determined from the M+1 time domain response sequence, including：

Select K sampled point；With；

The minimum time domain response estimated sequence of energy value sum is defined as the first time domain response estimated sequence.

With reference in a first aspect, in the 5th kind of possible implementation, the frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, obtaining the first time domain response estimated sequence, including：

The virtual time sequence is obtained, the virtual time sequence is the time difference between the time delay and time domain sampling point of multipath channel；

The frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, and obtains the first frequency domain response estimation subsequence；

The first frequency domain response estimation subsequence is changed, the first time domain response estimated sequence is obtained. With reference to the 5th kind of possible implementation, in the 6th kind of possible implementation, the frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, and obtains the first frequency domain response estimation subsequence, including：According to formula , obtain the first frequency domain response estimation subsequence；Wherein, ^^^^) the first frequency domain response estimation subsequence is represented, ^ ^ represent the frequency domain response estimation sequence, represent the virtual time sequence.

With reference to any of first aspect or the first possible implementation to the 6th kind of possible implementation possible implementation, in the 7th kind of possible implementation, frequency domain response estimation sequence for a transmission channel is obtained according to demodulated reference signal DMRS sequences, including：

Multiple frequency domain response signals for multiple transmission channels are obtained according to the DMRS sequences；The multiple frequency domain response signal is separated on frequency band, the frequency domain response signal for the transmission channel is obtained；

The frequency domain response signal according to corresponding with transmission channel sequence pair is handled, and obtains the frequency domain response estimation sequence.

With reference to any of first aspect or the first possible implementation to the 7th kind of possible implementation possible implementation, in the 8th kind of possible implementation, according to the first time domain response estimated sequence, N number of time domain response estimation subsequence for N number of data flow is obtained, including：According to cyclic shift number, N number of time domain response estimation subsequence for N number of data flow is obtained based on the first time domain response estimated sequence.

With reference to any of first aspect or the first possible implementation to the 8th kind of possible implementation possible implementation, in the 9th kind of possible implementation, estimate subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, including：Estimate subsequence for each time domain response, convert it to after frequency domain and be multiplied respectively with the virtual time sequence, obtain N number of frequency domain response estimation subsequence.

The second aspect of the present invention there is provided a kind of channel estimating apparatus, including：

First acquisition module, a transmission channel is directed to for being obtained according to demodulated reference signal DMRS sequences Frequency domain response estimation sequence；

Second acquisition module, is adjusted for the frequency domain response estimation sequence according to a virtual time sequence pair, obtains the first time domain response estimated sequence；

3rd acquisition module, for according to the first time domain response estimated sequence, obtaining N number of time domain response estimation subsequence for N number of data flow；N is positive integer；

4th acquisition module, for estimating subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain N number of channel estimation value for N number of data flow.

With reference to second aspect, in the first possible implementation, second acquisition module specifically for：According to the virtual time sequence, M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence；M is the integer not less than 0；The M+1 frequency domain response subsequence is changed respectively, M+1 time domain response estimated sequence is obtained；The first time domain response estimated sequence is determined from the M+1 time domain response estimated sequence, the energy leakage value of the first time domain response estimated sequence is less than the energy leakage value of other time domain response estimated sequences.

With reference to the first possible implementation, in second of possible implementation, second acquisition module specifically for：According to the virtual time adjusting step of determination and the length of the frequency domain response estimation sequence, the M+1 frequency domain response subsequence is obtained based on the frequency domain response estimation sequence；Wherein, the virtual time adjusting step is determined according to the virtual time sequence.

With reference to second of possible implementation, in the third possible implementation, second acquisition module specifically for：According to formula^l-, obtain described M+1

Μ^ψ (k)

Frequency domain response estimation subsequence；Wherein, the frequency domain response estimation subsequence is represented, ^ represents the virtual time adjusting step, represents the frequency domain response estimation sequence, it is the integer from 0 to Μ that V is taken respectively.

It is possible to any of the third possible implementation with reference to the first possible implementation Implementation, in the 4th kind of possible implementation, second acquisition module specifically for：Select K value sums；The minimum time domain response estimated sequence of energy value sum is defined as the first time domain response estimated sequence.

With reference to second aspect, in the 5th kind of possible implementation, second acquisition module specifically for：The virtual time sequence is obtained, the virtual time sequence is the time difference between the time delay and time domain sampling point of multipath channel；The frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, and obtains the first frequency domain response estimation subsequence；The first frequency domain response estimation subsequence is changed, the first time domain response estimated sequence is obtained.

With reference to the 5th kind of possible implementation, in the 6th kind of possible implementation, second acquisition module specifically for：According to formula ^^ ^^v^, obtains the first frequency domain response estimation subsequence；Wherein, The first frequency domain response estimation subsequence is represented, The frequency domain response estimation sequence is represented, the virtual time sequence is represented.

With reference to any of second aspect or the first possible implementation to the 6th kind of possible implementation possible implementation, in the 7th kind of possible implementation, first acquisition module specifically for：Multiple frequency domain response signals for multiple transmission channels are obtained according to the DMRS sequences；The multiple frequency domain response signal is separated on frequency band, the frequency domain response signal for the transmission channel is obtained；The frequency domain response signal according to corresponding with transmission channel sequence pair is handled, and obtains the frequency domain response estimation sequence.

With reference to any of second aspect or the first possible implementation to the 7th kind of possible implementation possible implementation, in the 8th kind of possible implementation, the 3rd acquisition module specifically for：According to cyclic shift number, the Ν time domain response estimation subsequence for the Ν data flow is obtained based on the first time domain response estimated sequence.

With reference to any of second aspect or the first possible implementation to the 8th kind of possible implementation possible implementation, in the 9th kind of possible implementation, the 4th acquisition module is specific For：Estimate subsequence for each time domain response, convert it to after frequency domain and be multiplied respectively with the virtual time sequence, obtain N number of frequency domain response estimation subsequence.

The third aspect of the present invention there is provided a kind of channel estimating apparatus, including：

Interface is obtained, for obtaining DMRS sequences；

Processor, for obtaining the frequency domain response estimation sequence for a transmission channel according to the DMRS sequences；The frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and obtains the first time domain response estimated sequence；According to the first time domain response estimated sequence, N number of time domain response estimation subsequence for N number of data flow is obtained；N is positive integer；Estimate subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain N number of channel estimation value for N number of data flow.

With reference to the third aspect, in the first possible implementation, the processor specifically for：According to the virtual time sequence, M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence；M is the integer not less than 0；The M+1 frequency domain response subsequence is changed respectively, obtain that M+1 time domain response estimation sequence is bad to determine the first time domain response estimated sequence, energy leakage value of the energy leakage value less than other time domain response estimated sequences of the first time domain response estimated sequence from the M+1 time domain response estimated sequence.

With reference to the first possible implementation, in second of possible implementation, the processor specifically for：According to the virtual time adjusting step of determination and the length of the frequency domain response estimation sequence, the M+1 frequency domain response subsequence is obtained based on the frequency domain response estimation sequence；Wherein, the virtual time adjusting step is determined according to the virtual time sequence.

With reference to second of possible implementation, in the third possible implementation, the processor specifically for： Obtain the M+1 frequency domain response estimation subsequence；Wherein, represent the frequency domain response estimation subsequence, represent the virtual time adjusting step, ^ ^ represent the frequency domain response estimation sequence, take respectively V be from 0 to M integer.

With reference to the first possible implementation to the possible implementation of any of the third possible implementation, in the 4th kind of possible implementation, the processor specifically for：Select K sampled point；Energy value sum of the M+1 time domain response estimated sequence on the K sampled point is obtained respectively；The minimum time domain response estimated sequence of energy value sum is defined as the first time domain response estimated sequence.

With reference to the third aspect, in the 5th kind of possible implementation, the processor specifically for：The virtual time sequence is obtained, the virtual time sequence is the time difference between the time delay and time domain sampling point of multipath channel；The frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, and obtains the first frequency domain response estimation subsequence；The first frequency domain response estimation subsequence is changed, the first time domain response estimated sequence is obtained.

With reference to the 5th kind of possible implementation, in the 6th kind of possible implementation, the processor specifically for： , obtain the first frequency domain response estimation subsequence；Wherein, ^^^) the first frequency domain response estimation subsequence is represented, the frequency domain response estimation sequence is represented, the virtual time sequence is represented.

With reference to any of the third aspect or the first possible implementation to the 6th kind of possible implementation possible implementation, in the 7th kind of possible implementation, the processor specifically for：Multiple frequency domain response signals for multiple transmission channels are obtained according to the DMRS sequences；The multiple frequency domain response signal is separated on frequency band, the frequency domain response signal for the transmission channel is obtained；The frequency domain response signal according to corresponding with transmission channel sequence pair is handled, and obtains the frequency domain response estimation sequence.

With reference to any of the third aspect or the first possible implementation to the 7th kind of possible implementation possible implementation, in the 8th kind of possible implementation, the processor specifically for：According to cyclic shift number, N number of time domain response estimation subsequence for N number of data flow is obtained based on the first time domain response estimated sequence. With reference to any of the third aspect or the first possible implementation to the 8th kind of possible implementation possible implementation, in the 9th kind of possible implementation, the processor specifically for：Estimate subsequence for each time domain response, convert it to after frequency domain and be multiplied respectively with the virtual time sequence, obtain N number of frequency domain response estimation subsequence.

In the embodiment of the present invention, after the frequency domain response estimation sequence is obtained, can the frequency domain estimated sequence according to the virtual time sequence pair be adjusted, so, pass through the adjustment of the virtual time sequence, the time difference between the time delay of multipath channel and time domain sampling point can be made as far as possible in the poor scope of preset time, you can to make the time delay of multipath channel be alignd with time domain sampling point as far as possible, so as to avoid the leakage of channel estimation energy as far as possible.If if multi-stream data simultaneous transmission, using the processing method in the embodiment of the present invention, the energy of the channel estimation of different data streams will not be revealed substantially, so as to will not be interfered to the channel estimation of other layer data streams, improve the accuracy of channel estimation.Brief description of the drawings

Figure 1A-Fig. 1 D are Energy distribution schematic diagram of the channel on sampled point in the prior art；Fig. 2 is the broad flow diagram of channel estimation methods in the embodiment of the present invention；

Fig. 3 divides schematic diagram for the uplink time/frequency source structure in LTE system in the embodiment of the present invention；Fig. 4 A- Fig. 4 D are Energy distribution schematic diagram of the channel on sampled point in the embodiment of the present invention；Fig. 5 is the structure chart of channel estimating apparatus in the embodiment of the present invention；

Fig. 6 is the structure chart of channel estimating apparatus in the embodiment of the present invention.Embodiment

Channel estimation methods in the embodiment of the present invention include：Frequency domain response estimation sequence for a transmission channel is obtained according to demodulated reference signal DMRS sequences；The frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and obtains the first time domain response estimated sequence；According to the first time domain response estimated sequence, N number of time domain response estimation subsequence for N number of data flow is obtained；N is positive integer；Estimate subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain the N channel estimation value for N number of data flow. In the embodiment of the present invention, after the frequency domain response estimation sequence is obtained, can the frequency domain estimated sequence according to the virtual time sequence pair be adjusted, so, pass through the adjustment of the virtual time sequence, the time difference between the time delay of multipath channel and time domain sampling point can be made as far as possible in the poor scope of preset time, you can to make the time delay of multipath channel be alignd with time domain sampling point as far as possible, so as to avoid the leakage of channel estimation energy as far as possible.If if multi-stream data simultaneous transmission, using the processing method in the embodiment of the present invention, the energy of the channel estimation of different data streams will not be revealed substantially, so as to will not be interfered to the channel estimation of other layer data streams, improve the accuracy of channel estimation.

To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.

The techniques described herein may be used in various communication systems, such as current 2G, 3G communication systems and next generation communication system, such as global system for mobile communications（GSM, Global System for Mobile communications), CDMA (CDMA, Code Division Multiple Access) system, time division multiple acess（TDMA, Time Division Multiple Access) system, WCDMA (WCDMA, Wideband Code Division Multiple Access Wireless), frequency division multiple access (FDMA, Frequency Division Multiple Addressing) system, OFDM (OFDMA, Orthogonal Frequency-Division Multiple Access) system, Single Carrier Frequency Division Multiple Access (SC-FDMA) system, GPRS（GPRS, General Packet Radio Service) system, Long Term Evolution（LTE, Long Term Evolution) system, and other such communication systems.

Various aspects are described herein in connection with user equipment and/or network side equipment.

User equipment, can be that wireless terminal can also be catv terminal, wireless terminal can refer to the equipment for providing a user voice and/or data connectivity, portable equipment with wireless connecting function or other processing equipments for being connected to radio modem.Wireless terminal can be through wireless access network（For example, RAN, Radio Access Network) communicated with one or more core nets, wireless terminal can be with It is mobile terminal, such as mobile phone（Or be " honeycomb " phone）With the computer with mobile terminal, for example, it may be portable, pocket, hand-held, built-in computer or vehicle-mounted mobile device, they exchange language and/or data with wireless access network.For example, PCS（PCS, Personal Communication Service) phone, wireless phone, Session initiation Protocol（SIP) phone, WLL（WLL, Wireless Local Loop) stand, personal digital assistant（PDA, Personal Digital Assistant) etc. equipment.Wireless terminal is referred to as system, subscri er unit（Subscriber Unit), subscriber station（Subscriber Station), movement station（Mobile Station), mobile station（Mobile), distant station（Remote Station), access point（Access Point), remote terminal（Remote Terminal), access terminal（Access Terminal), user terminal（User Terminal), user agent（User Agent), user equipment (User Device) or subscriber's installation (User Equipment).

Network side equipment for example can be base station, can also be either trunking or can also be other network side equipments.Base station（For example, access point）It can refer in access network on interface in the air by one or more sectors and the equipment of wireless terminal communications.Base station can be used for IP packets mutually being changed the air frame received, and as the router between wireless terminal and the remainder of access network, the remainder of wherein access network may include Internet protocol（IP) network.Attribute management of the base station also tunable to air interface.For example, base station can be the base station in GSM or CDMA（BTS, Base Transceiver Station), can also be the base station in WCDMA（), NodeB it can also be the evolved base station in LTE（NodeB or eNB or e-NodeB, evolutional Node B), the application is not limited.

In addition, the terms " system, and " network " be often used interchangeably herein.The terms " and/or ", only a kind of incidence relation for describing affiliated partner, represents there may be three kinds of relations, for example, Α and/or Β, can be represented：Individualism A, while there is A and B, these three situations of individualism B.In addition, character "/" herein, typically represent forward-backward correlation object be it is a kind of " or " relation.

The embodiment of the present invention is described in further detail with reference to Figure of description.

Embodiment one

Fig. 2 is referred to, the embodiment of the present invention is provided under a kind of channel estimation methods, the main flow of methods described：

Step 201:Frequency domain sound for a transmission channel is obtained according to demodulated reference signal DMRS sequences Answer estimated sequence.

Fig. 3 is referred to, Fig. 3 is illustrated that the structure of the uplink time/frequency source in LTE system is divided.

It is divided into subframe one by one in LTE systems, on the time, the duration of each subframe is lms.Each subframe can be further divided into 14 OFDM (Orthogonal Frequency Division Multiplex, OFDM）Symbol, the 4th symbol therein and the 11st symbol are used to carry out DMRS sequences (De Modulation Reference Signal, demodulated reference signal）Transmission, as shown in the label 4 and 11 in Fig. 3, remaining symbol is used to carry out data transmission.A in Fig. 3 represents overall system bandwidth, and B is expressed as the bandwidth of a UE distribution.

Base station scheduling one UE (User Equipment, user equipment）Carry out uplink in some subframe, then the transmission distribution bandwidth that base station can be to UE, the bandwidth that a UE takes is often the sub-fraction of whole system bandwidths.The upstream data that different UE are sent can take different frequency domain positions.For same UE transmission, the bandwidth that its DMRS sequence sent takes with data is identical.So receiving terminal can carry out channel estimation according to the DMRS sequences received first, then be demodulated reception with the channel estimation value data portion obtained.

If employing space division multiplexing（Spatial Multiplexing, SM) technology, then multiple data flows can be sent on identical running time-frequency resource.The each data flow of correspondence, a DMRS^ can be sent simultaneously.Such as one UE sends 4 data flows, it is necessary to which it is that receiving-transmitting sides are appointed to send 4 DMRS^ DMRS^, so receiving terminal knows DMRS content in advance.

In LTE system, DMRS sequences are generated after a cyclically shifted sequences are multiplied by a root sequence.Shown in formula below ^： (¾: ,ί_?j π ij 0 < η <Μ () wherein,_s ^GShe is Α ' .11 } it is the cyclic shift used) it is root sequence, M is the length of DMRS row.

The DMRS sequences of each data flow need to use identical root sequence, and the DMRS sequences of different data streams use different cyclic shifts, and just can guarantee that can all carry out channel estimation in receiving terminal to each layer data. For example, for the transmission of 4 data flows, then generating 4 DMRS sequences, each DMRS sequences use identical root sequence^f", the DMRS sequences of different data streams use different cyclic shifts, and ensure not repeat between each cyclic shift.The corresponding DMRS sequences of such as data flow 1 using cyclic shift ^=^ϋ, the corresponding DMRS sequences of data flow 2 using cyclic shift=³, the corresponding DMRS sequences of data flow 3 use cyclic shift^{= 6}, the corresponding DMRS sequences of data flow 4 are using circulation shifting

In the embodiment of the present invention, need to carry out channel estimation in receiving terminal.In the embodiment of the present invention, receiving terminal for example can be network side equipment.

In the embodiment of the present invention, the frequency domain response estimation sequence for a transmission channel is obtained according to the DMRS sequences, can be specifically：Multiple frequency domain response signals for multiple transmission channels are obtained according to the DMRS sequences；The transmission of the multiple users of multiple frequency domain response signal correspondences, the multiple frequency domain response signal is separated on frequency band, obtains the frequency domain response signal for the transmission channel；The frequency domain response signal according to corresponding with transmission channel sequence pair is handled, and obtains the frequency domain response estimation sequence.

In the embodiment of the present invention, after the DMRS sequences are obtained, the DMRS sequences can be subjected to FFT (Fast Fourier Transformation, Fast Fourier Transform (FFT)）Processing, by FFT, frequency domain response signal is converted to by the time domain response signal received.Specifically, multiple frequency domain response signals for multiple transmission channels can be obtained according to the DMRS sequences.

After multiple frequency domain response signals are obtained, the multiple frequency domain response signal can be separated on frequency band, i.e., the frequency domain response signal from different UE be separated on frequency band.As it was noted above, the frequency domain response signal from different UE can occupy different frequency domain positions, so by the separation on frequency band, each UE signals sent can be separated, to be respectively processed.Illustrated below only for a UE, each UE handling process is all identical with this.Assuming that the frequency domain response signal for the UE now obtained can be expressed as, < M.M is the length of the sequence of frequency domain response signal. For the frequency domain response signal, the conjugate transposition sequence of root sequence, the formula seen below can be multiplied by： In formula 2, ^ ^^ ^ ^^ are the conjugate transpositions of root sequence.Both known about as it was noted above, DMRS sequences are receiving-transmitting sides, so what kind of root sequence receiving terminal clearly employs naturally.After multiplying is completed, then the frequency domain response estimation sequence is obtained, the frequency domain response estimation sequence can be represented with sequence ^^'^.For example, a kind of possible sequence can be Zadoff-chu sequences, or, a kind of possible sequence can be Gold sequence, or, root sequence can also be other root sequences, and the present invention is not limited this.

Step 202:The frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and obtains the first time domain response estimation subsequence.

In the embodiment of the present invention, after the frequency domain response estimation sequence is obtained, the frequency domain response estimation sequence can be adjusted according to the virtual time sequence, obtain the first time domain response estimation subsequence.

The virtual time sequence can be used to indicate that the estimation time difference between the time delay of multipath channel and time domain sampling point, and the estimation time difference can be in the poor scope of preset time.

Preferably, the estimation time difference between the time delay and time domain sampling point of the multipath channel can be 0 as far as possible, i.e. the time delay of multipath channel is alignd with time domain sampling point, so can greatly reduce the energy leakage of channel estimation.

In the embodiment of the present invention, the frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and obtains the first time domain response estimation subsequence, can there is following two different modes：

The first, in the embodiment of the present invention, the frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and is obtained the first time domain response estimation subsequence, can is specifically：The virtual time sequence is obtained, the virtual time sequence is used to represent estimating between the time delay of multipath channel and time domain sampling point Count the time difference；The frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, and obtains the first frequency domain response estimation subsequence；The first frequency domain response estimation subsequence is changed, the first time domain response estimated sequence is obtained.

Specifically, the frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, the first frequency domain response estimation subsequence is obtained, can be carried out according to below equation：

) ⁼ r " ( 3 )

Wherein, ^^^^ represents the first frequency domain response estimation subsequence, ζ Τ ^) the frequency domain response estimation sequence is represented,^{7 2:}As described virtual time sequence, represents the estimation time difference between the time delay and time domain sampling point of multipath channel.It is using the purpose of formula 3 so that receive signal enters line displacement in time so that the time domain response estimation of channel can align with sampled point.

After the first frequency domain response estimation subsequence is obtained, the first frequency domain response estimation subsequence can be changed, obtain the first time domain response estimated sequence.

Specifically, can be according to IDFT (Inverse Discontinuous Fourier Transformation, inverse discrete Fourier transform）The first frequency domain response estimation subsequence is changed, for example formula is as follows： (4) wherein, ^^ represents the first time domain response estimated sequence.

Wherein, when obtaining the estimation time difference, a variety of algorithm for estimating use.For example can be using the cyclic prefix of the OFDM symbol algorithm related to the progress of symbol last part, or can be estimated by the phase difference of DMRS sequences, or can also be estimated using other method, the specific estimation mode present invention is not limited.

Second, in the embodiment of the present invention, the frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and is obtained the first time domain response estimation subsequence, can is specifically：According to it is described virtual when Between sequence, based on the frequency domain response estimation sequence obtain M+l frequency domain response estimation subsequence；M is the integer not less than 0；The M+1 frequency domain response subsequence is changed respectively, M+1 time domain response estimated sequence is obtained；The first time domain response estimated sequence is determined from the M+1 time domain response estimated sequence, the energy leakage value of the first time domain response estimated sequence is less than the energy leakage value of other time domain response estimated sequences.

Specifically, in the embodiment, according to the virtual time sequence, obtaining M+1 frequency domain response estimation subsequence based on the frequency domain response estimation sequence, being specifically：According to the virtual time adjusting step of determination and the length of the frequency domain response estimation sequence, the M+1 frequency domain response subsequence is obtained based on the frequency domain response estimation sequence；Wherein, the virtual time adjusting step is determined according to the virtual time sequence.

Specifically, in the embodiment of the present invention, according to the virtual time adjusting step of determination and the length of the frequency domain response estimation sequence, the M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence, can be carried out according to below equation：

Wherein, H k) represent the frequency domain response estimation sequence, represent the virtual time adjusting step, it is the integer from 0 to Μ to take V respectively, just can obtain the M+1 frequency domain response estimation subsequence, the M+1 branch is divided into equivalent to by the frequency domain response estimation.In the embodiment of the present invention, ^ can carry out value according to actual needs, and ^ value is smaller, then the branch divided is more, and the result of acquisition is also more accurate.

In the embodiment of the present invention, after the M+1 frequency domain response estimation subsequence is obtained, need respectively to be changed described+1 frequency domain response sequence of Μ, can be specifically to carry out IDFT conversions, it is hereby achieved that the M+1 time domain response estimated sequence.Wherein, the time domain response estimated sequence can be used

^!Represent ' Specifically, the M+1 frequency domain response estimation subsequence can respectively be changed according to IDFT, under example ^ formula ^： Wherein,^ι" represent the time domain response estimated sequence.

After the M+1 time domain response sequence is obtained, need to select a time domain response estimated sequence from the M+1 time domain response estimated sequence to carry out subsequent step, i.e., the first time domain response estimated sequence is selected from the M+1 time domain response estimated sequence.

Specifically, it is a kind of it is possible determined from the M+1 time domain response estimated sequence described first using response estimated sequence mode can be：Select Κ sampled point；Energy value sum of the M+1 time domain response estimated sequence on the Κ sampled point is obtained respectively；The minimum time domain response estimated sequence of energy value sum is defined as the first time domain response estimated sequence.

For example, by the obtained M+1 time domain response estimated sequence, Κ observation station, i.e., described Κ sampled point are selected between different cyclic shifts.In different branches, in i.e. different time domain response estimated sequences, so that branch of the energy sum minimum in the Κ observation station is exactly the minimum branch of energy leakage, i.e. so that the time domain response estimated sequence of the energy leakage value sum minimum on Κ sampled point is exactly the first time domain response estimated sequence.For example, assuming that the time domain response estimated sequence) length be 48, and the transmission of 4 data flows is employed, 4 data streams have used cyclic shift { 0,3 respectively, 6,9 }, then the main energetic of the channel estimation of four streams should concentrate on the 1st, 13, around 25,37 this four sampled points.In order to accurately be sampled and be assessed, we avoid this four sampled points, select one group of sampled point in addition, such as the sampled point in these scopes of optional 5-10,16-22,28-34,40-46 etc..For each time domain response estimated sequence, calculate the energy sum on the K sampled point, energy and minimum time domain response estimated sequence are taken as the minimum time domain response estimated sequence of energy leakage, the energy and minimum time domain response estimated sequence can be defined as the first time domain response estimated sequence, so, it can ensure that the energy of channel estimation of the different data streams obtained is tried one's best and will not revealed, so as to avoid pair as far as possible The channel estimation of other data flows is interfered.

For example as shown in Fig. 4 A, Fig. 4 B, Fig. 4 C and Fig. 4 D, wherein each figure represents energy of the time domain response estimated sequence on each sampled point, wherein transverse axis is sampled point, and the longitudinal axis is energy value.From this four width it can be seen from the figure that, the time domain response estimated sequence shown in Fig. 4 D is that leakage is minimum, then the time domain response estimated sequence shown in Fig. 4 D can be defined as into the first time domain response estimated sequence.

Step 203:According to the first time domain response estimated sequence, the N time domain response estimation subsequence for N number of data flow is obtained；N is positive integer.

Specifically, in the embodiment of the present invention, according to the first time domain response estimated sequence, obtaining N number of time domain response estimation subsequence for N data flow, Ke Yishi：According to cyclic shift number, N number of time domain response estimation subsequence for N number of data flow is obtained based on the first time domain response estimated sequence.Here, it is the channel response of time domain.Due to having the DMRS sequences of multiple data stream while the transmission carried out, and employ different cyclic shifts, we it will be observed that ^J is really the superposition of the time domain response of the channel of multiple data stream, and each data flow channel estimation by cyclic shift to different positions.

The channel estimation value of different data streams is come out by interception respectively, has obtained the time domain channel estimation of not cocurrent flow.The process of this interception can be regarded as, only retain ^^) in, on cyclic shift position, and the channel estimation value on neighbouring several sampled points, and the numerical value on remaining position is both configured to 0, so as to obtain the channel response after the interception of multiple data stream, that is, obtain N number of time domain response estimation subsequence.By taking four streaming as an example, then ^^eO L ', so as to obtain 4 time domain response estimation subsequences.

Step 204:Estimate subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain N number of channel estimation value for the N data flow.

After N number of time domain response estimation subsequence is obtained, each time domain response can be estimated sub- sequence Row are transformed into frequency domain, can be specifically the IDFT according to M points, each time domain response estimation subsequence are transformed into frequency domain, such as formula can be as follows：

Λ

HDPT, Λ k )

Wherein, ^ n^ ^ represent the frequency domain response estimation subsequence before adjustment, h^^) represent the N time domain response estimation subsequence.

The frequency domain response estimation subsequence before N number of adjustment can be obtained altogether, after the frequency domain response estimation subsequence before obtaining N number of adjustment, the frequency domain response estimation subsequence before N number of adjustment can be handled respectively according to the virtual time sequence, it is hereby achieved that N number of frequency domain response estimation subsequence, is also equivalent to obtain N number of channel estimation value.

Preferably, estimating subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, obtain N number of frequency domain response estimation subsequence, can be specifically：Estimate subsequence for each time domain response, convert it to after frequency domain and be multiplied respectively with the virtual time sequence, obtain N number of frequency domain response estimation subsequence.

Specifically, in the embodiment of the present invention, if be adjusted in the frequency domain response estimation sequence according to the virtual time sequence pair, utilize is first way when obtaining the first time domain response estimation subsequence, then, the frequency domain response estimation subsequence before the adjustment is handled respectively according to the virtual time sequence, can be that ^n^D is multiplied by e^{_j2 k}, the frequency domain response estimation subsequence can be obtained.That is, e^{_j i k}The virtual time sequence can be regarded as.

Specifically, in the embodiment of the present invention, if be adjusted in the frequency domain response estimation sequence according to the virtual time sequence pair, utilize is the second way when obtaining the first time domain response estimation subsequence, then, the frequency domain response estimation subsequence before the adjustment is handled respectively according to the virtual time sequence, can will be multiplied by e ', you can the frequency domain response estimation subsequence is obtained.That is, e is that can regard the virtual time sequence as. Embodiment two

Fig. 5 is referred to, the embodiment of the present invention provides a kind of channel estimating apparatus, and described device can include the first acquisition module 501, the second acquisition module 502, the 3rd acquisition module 503 and the 4th acquisition module 504.

First acquisition module 501 can be used for obtaining the frequency domain response estimation sequence for a transmission channel according to demodulated reference signal DMRS sequences.

Second acquisition module 502 can be used for the frequency domain response estimation sequence according to a virtual time sequence pair and be adjusted, and obtain the first time domain response estimated sequence.

3rd acquisition module 503 can be used for according to the first time domain response estimated sequence, obtain N number of time domain response estimation subsequence for N data flow；N is positive integer.

4th acquisition module 504 can be used for estimating subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain N number of channel estimation value for N number of data flow.

Second acquisition module 502 specifically can be used for according to the virtual time sequence, and M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence；M is the integer not less than 0；The M+1 frequency domain response subsequence is changed respectively, M+1 time domain response estimated sequence is obtained；The first time domain response estimated sequence is determined from the M+1 time domain response estimated sequence, the energy leakage value of the first time domain response estimated sequence is less than the energy leakage value of other time domain response estimated sequences.

Second acquisition module 502 specifically can be used for the length of virtual time adjusting step and the frequency domain response estimation sequence according to determination, and the M+1 frequency domain response subsequence is obtained based on the frequency domain response estimation sequence；Wherein, the virtual time adjusting step is just blunt according to virtual time sequence determination.

Second acquisition module 502 specifically can be used for according to formula Obtain the M+1 frequency domain response estimation subsequence；Wherein, ν ＆ Λ^ΛThe frequency domain response estimation subsequence is represented, the virtual time adjusting step is represented, ^ represents the frequency domain response estimation sequence, and it is the integer from 0 to Μ that V is taken respectively.Second acquisition module 502 specifically can be used for selecting Κ sampled point；Energy value sum of the M+1 time domain response estimated sequence on the Κ sampled point is obtained respectively；The minimum time domain response estimated sequence of energy value sum is defined as the first time domain response estimated sequence.

Second acquisition module 502 specifically can be used for obtaining the virtual time sequence, and the virtual time sequence is the time difference between the time delay and time domain sampling point of multipath channel；The frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, and obtains the first frequency domain response estimation subsequence；The first frequency domain response estimation subsequence is changed, the first time domain response estimated sequence is obtained.Second acquisition module 502 specifically can be used for according to formula^{1 _}

Obtain the first frequency domain response estimation subsequence；Wherein,^{i ji}^^、ⁱ^ represents first frequency domain response

V /_? ■

Estimate subsequence, ^^ represents the frequency domain response estimation sequence, represents the virtual time sequence.

First acquisition module 501 specifically can be used for obtaining multiple frequency domain response signals for multiple transmission channels according to the DMRS sequences；The multiple frequency domain response signal is separated on frequency band, the frequency domain response signal for the transmission channel is obtained；The frequency domain response signal according to corresponding with transmission channel sequence pair is handled, and obtains the frequency domain response estimation sequence.

3rd acquisition module 503 specifically can be used for according to cyclic shift number, and the Ν time domain response estimation subsequence for the Ν data flow is obtained based on the first time domain response estimated sequence.

4th acquisition module 504 specifically can be used for estimating subsequence for each time domain response, converts it to after frequency domain and is multiplied respectively with the virtual time sequence, obtains the Ν frequency domain response estimation subsequence.

Embodiment three refers to Fig. 6, and the embodiment of the present invention provides a kind of channel estimating apparatus, and described device can include obtaining interface 601 and processor 602. Interface 601 is obtained to can be used for obtaining DMRS sequences.

Processor 602 can be used for obtaining the frequency domain response estimation sequence for a transmission channel according to the DMRS sequences；The frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and obtains the first time domain response estimated sequence；According to the first time domain response estimated sequence, N number of time domain response estimation subsequence for N number of data flow is obtained；N is positive integer；Estimate subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain N number of channel estimation value for N number of data flow.

Processor 602 specifically can be used for according to the virtual time sequence, and M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence；M is the integer not less than 0；The M+1 frequency domain response subsequence is changed respectively, M+1 time domain response estimated sequence is obtained；The first time domain response estimated sequence is determined from the M+1 time domain response estimated sequence, the energy leakage value of the first time domain response estimated sequence is less than the energy leakage value of other time domain response estimated sequences.

Processor 602 specifically can be used for the length of the virtual time adjusting step and the frequency domain response estimation sequence according to determination, and the M+1 frequency domain response subsequence is obtained based on the frequency domain response estimation sequence；Wherein, the virtual time adjusting step is that shelter states the determination of virtual time sequence.Processor 602 obtains the M+1 frequency domain Response estimation subsequence；Wherein, the frequency domain response estimation subsequence is represented, the virtual time adjusting step is represented, ^ ^ represent the frequency domain response estimation sequence, it is the integer from 0 to M that V is taken respectively.

Processor 602 specifically can be used for selecting K sampled point；Energy value sum of the M+1 time domain response estimated sequence on the K sampled point is obtained respectively；The minimum time domain response estimated sequence of energy value sum is defined as the first time domain response estimated sequence.

Processor 602 specifically can be used for obtaining the virtual time sequence, and the virtual time sequence is the time difference between the time delay and time domain sampling point of multipath channel；According to the virtual time sequence pair Frequency domain response estimation sequence is adjusted, and obtains the first frequency domain response estimation subsequence；The first frequency domain response estimation subsequence is changed, the first time domain response estimated sequence is obtained.

fi_vtM bis-

Processor 602 specifically can be used for according to formula^{v /}Ovum-^'², obtain the first frequency domain response estimation subsequence；Wherein, Subsequence,：、·^ΑThe frequency domain response estimation sequence is represented, shows the virtual time sequence.

Processor 602 specifically can be used for obtaining multiple frequency domain response signals for multiple transmission channels according to the DMRS sequences；The multiple frequency domain response signal is separated on frequency band, the frequency domain response signal for the transmission channel is obtained；The frequency domain response signal according to corresponding with transmission channel sequence pair is handled, and obtains the frequency domain response estimation sequence.

Processor 602 specifically can be used for according to cyclic shift number, and N number of time domain response estimation subsequence for N number of data flow is obtained based on the first time domain response estimated sequence.

Processor 602 specifically can be used for estimating subsequence for each time domain response, converts it to after frequency domain and is multiplied respectively with the virtual time sequence, obtains N number of frequency domain response estimation subsequence.

Channel estimation methods in the embodiment of the present invention include：Frequency domain response estimation sequence for a transmission channel is obtained according to demodulated reference signal DMRS sequences；The frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and obtains the first time domain response estimated sequence；According to the first time domain response estimated sequence, N number of time domain response estimation subsequence for N number of data flow is obtained；N is positive integer；Estimate subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain the N channel estimation value for N number of data flow.

In the embodiment of the present invention, after the frequency domain response estimation sequence is obtained, can the frequency domain estimated sequence according to the virtual time sequence pair be adjusted, so, pass through the adjustment of the virtual time sequence, the time difference between the time delay of multipath channel and time domain sampling point can be made as far as possible in the poor scope of preset time, you can to make the time delay of multipath channel be alignd with time domain sampling point as far as possible, so as to avoid the leakage of channel estimation energy as far as possible.If if multi-stream data simultaneous transmission, using in the embodiment of the present invention Processing method, the energy of the channel estimation of different data streams will not be revealed substantially, so as to will not be interfered to the channel estimation of other layer data streams, improve the accuracy of channel estimation.

It is apparent to those skilled in the art that, for convenience and simplicity of description, only it is illustrated with the division of above-mentioned each functional module, in practical application, it can as needed and by above-mentioned functions distribute and be completed by different functional modules, the internal structure of device is divided into different functional modules, to complete all or part of function described above.The specific work process of the system, apparatus, and unit of foregoing description, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.

In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be realized by another way.For example, device embodiment described above is only schematical, for example, the division of the module or unit, it is only a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can combine or be desirably integrated into another system, or some features can be ignored, or do not perform.Another, it, by some interfaces, the INDIRECT COUPLING or communication connection of device or unit, can be electrical, machinery or other forms that shown or discussed coupling or direct-coupling or communication connection each other, which can be,.It can be for the part that unit is shown or may not be physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Some or all of unit therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.

In addition, each functional unit in the application each embodiment can be integrated in a processing unit or unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated unit can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.

If the integrated unit is realized using in the form of SFU software functional unit and as independent production marketing or in use, can be stored in a computer read/write memory medium.Understood based on such, the part or all or part of the technical scheme that the technical scheme of the application substantially contributes to prior art in other words can be embodied in the form of software product, the computer software product is stored in a storage medium, including some instructions are to cause a computer equipment（Can be personal computer, Server, or the network equipment etc.）Or processor（Processor all or part of step of each embodiment methods described of the application) is performed.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage（ROM, Read-Only Memory), random access memory（RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.

Described above, above example is only described in detail to the technical scheme to the application, but the explanation of above example is only intended to the method and its core concept for helping to understand the present invention, should not be construed as limiting the invention.Those skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in should be all included within the scope of the present invention.

Claims

Claim

1st, a kind of channel estimation methods, it is characterised in that including：

Frequency domain response estimation sequence for a transmission channel is obtained according to demodulated reference signal DMRS sequences；

The frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and obtains the first time domain response estimated sequence；

According to the first time domain response estimated sequence, N number of time domain response estimation subsequence for N number of data flow is obtained；N is positive integer；

Estimate subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain N number of channel estimation value for N number of data flow.

2nd, the method as described in claim 1, it is characterised in that the frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, obtains the first time domain response estimated sequence, including：

According to the virtual time sequence, M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence；M is the integer not less than 0；

The M+1 frequency domain response subsequence is changed respectively, M+1 time domain response estimated sequence is obtained；

The first time domain response estimated sequence is determined from the M+1 time domain response estimated sequence, the energy leakage value of the first time domain response estimated sequence is less than the energy leakage value of other time domain response estimated sequences.

3rd, method as claimed in claim 2, it is characterised in that according to the virtual time sequence, M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence, including：According to the virtual time adjusting step of determination and the length of the frequency domain response estimation sequence, the M+1 frequency domain response subsequence is obtained based on the frequency domain response estimation sequence；Wherein, the virtual time adjusting step is determined according to the virtual time sequence.

4th, the method as described in claim 3, it is characterised in that adjusted and walked according to the virtual time of determination The length of long and described frequency domain response estimation sequence, obtains described based on the frequency domain response estimation sequence

M+1 frequency domain response estimation subsequence, including：According to formula Obtain the M+l frequency domain response estimation subsequence；Wherein, ' the frequency domain response estimation subsequence is represented, the virtual time adjusting step is represented, ^^ represents the frequency domain response estimation sequence, it is the integer from 0 to M that V is taken respectively.

5th, the method as described in any claims of claim 2-4, it is characterised in that the first time domain response estimated sequence is determined from the M+1 time domain response sequence, including：

Select K sampled point；

The minimum time domain response estimated sequence of energy value sum is defined as the first time domain response estimated sequence.

6th, the method as described in claim 1, it is characterised in that the frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, obtains the first time domain response estimated sequence, including：

The virtual time sequence is obtained, the virtual time sequence is the time difference between the time delay and time domain sampling point of multipath channel；

The frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, and obtains the first frequency domain response estimation subsequence；

The first frequency domain response estimation subsequence is changed, the first time domain response estimated sequence is obtained.

7th, method as claimed in claim 6, it is characterised in that the frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, obtains the first frequency domain response estimation subsequence, including：According to formula , obtain the first frequency domain response estimation subsequence；Its In, The frequency domain response estimation sequence is represented, i represents the virtual time sequence.

8th, the method as described in any claims of claim 1-7, it is characterised in that the frequency domain response estimation sequence for a transmission channel is obtained according to demodulated reference signal DMRS sequences, including：

Multiple frequency domain response signals for multiple transmission channels are obtained according to the DMRS sequences；The multiple frequency domain response signal is separated on frequency band, the frequency domain response signal for the transmission channel is obtained；

The frequency domain response signal according to corresponding with transmission channel sequence pair is handled, and obtains the frequency domain response estimation sequence.

9th, the method as described in any claims of claim 1-8, it is characterised in that according to the first time domain response estimated sequence, obtains N number of time domain response estimation subsequence for N number of data flow, including：According to cyclic shift number, N number of time domain response estimation subsequence for N number of data flow is obtained based on the first time domain response estimated sequence.

10th, the method as described in any claims of claim 1-9, it is characterised in that estimate subsequence for each time domain response, converts it to after frequency domain and to be handled according to the virtual time sequence, obtains N frequency domain response estimation subsequence, including：Estimate subsequence for each time domain response, convert it to after frequency domain and be multiplied respectively with the virtual time sequence, obtain N number of frequency domain response estimation subsequence.

11st, a kind of channel estimating apparatus, it is characterised in that including：

First acquisition module, for obtaining the frequency domain response estimation sequence for a transmission channel according to demodulated reference signal DMRS sequences；

Second acquisition module, is adjusted for the frequency domain response estimation sequence according to a virtual time sequence pair, obtains the first time domain response estimated sequence；

3rd acquisition module, for according to the first time domain response estimated sequence, obtaining N number of time domain response estimation subsequence for N number of data flow；N is positive integer；

4th acquisition module, for estimating subsequence for each time domain response, converts it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain For N number of channel estimation value of N number of data flow.

12nd, device as claimed in claim 11, it is characterised in that second acquisition module specifically for：According to the virtual time sequence, M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence；M is the integer not less than 0；The M+1 frequency domain response subsequence is changed respectively, M+1 time domain response estimated sequence is obtained；The first time domain response estimated sequence is determined from the M+1 time domain response estimated sequence, the energy leakage value of the first time domain response estimated sequence is less than the energy leakage value of other time domain response estimated sequences.

13rd, device as claimed in claim 12, it is characterised in that second acquisition module specifically for：According to the virtual time adjusting step of determination and the length of the frequency domain response estimation sequence, the M+1 frequency domain response subsequence is obtained based on the frequency domain response estimation sequence；Wherein, the virtual time adjusting step is determined according to the virtual time sequence.

14th, device as claimed in claim 13, it is characterised in that second acquisition module specifically for：According to formula ^ ^ () ~ ^zf i^, obtain described_M+I frequency domain response estimation subsequence；Wherein, The frequency domain response estimation subsequence is represented, the virtual time adjusting step is represented,^/The frequency domain response estimation sequence is represented, it is the integer from 0 to M that V is taken respectively.

15th, the device as described in any claims of claim 12-14, it is characterised in that second acquisition module specifically for：Select K sampled point；Energy value sum of the M+1 time domain response estimated sequence on the K sampled point is obtained respectively；The minimum time domain response estimated sequence of energy value sum is defined as the first time domain response estimated sequence.

16th, device as claimed in claim 11, it is characterised in that second acquisition module specifically for：The virtual time sequence is obtained, the virtual time sequence is the time difference between the time delay and time domain sampling point of multipath channel；The frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, and obtains the first frequency domain response estimation subsequence；The first frequency domain response estimation subsequence is turned Change, obtain the first time domain response estimated sequence.

17th, device as claimed in claim 16, it is characterised in that second acquisition module specifically for： ¾ ^iSiSternly, the first frequency domain response estimation subsequence is obtained；Wherein, the first frequency domain response estimation subsequence is represented,^Α' the frequency domain response estimation sequence is represented, represent the virtual time sequence.

18th, the device as described in any claims of claim 11-17, it is characterised in that first acquisition module specifically for：Multiple frequency domain response signals for multiple transmission channels are obtained according to the DMRS sequences；The multiple frequency domain response signal is separated on frequency band, the frequency domain response signal for the transmission channel is obtained；The frequency domain response signal according to corresponding with transmission channel sequence pair is handled, and obtains the frequency domain response estimation sequence.

19th, the device as described in any claims of claim 11-18, it is characterised in that the 3rd acquisition module specifically for：According to cyclic shift number, N number of time domain response estimation subsequence for N number of data flow is obtained based on the first time domain response estimated sequence.

20th, the device as described in any claims of claim 11-19, it is characterised in that the 4th acquisition module specifically for：Estimate subsequence for each time domain response, convert it to after frequency domain and be multiplied respectively with the virtual time sequence, obtain N number of frequency domain response estimation subsequence.

21st, a kind of channel estimating apparatus, it is characterised in that including：

Interface is obtained, for obtaining DMRS sequences；

Processor, for obtaining the frequency domain response estimation sequence for a transmission channel according to the DMRS sequences；The frequency domain response estimation sequence according to a virtual time sequence pair is adjusted, and obtains the first time domain response estimated sequence；According to the first time domain response estimated sequence, N number of time domain response estimation subsequence for N number of data flow is obtained；N is positive integer；Estimate subsequence for each time domain response, convert it to after frequency domain and to be handled according to the virtual time sequence, N number of frequency domain response estimation subsequence is obtained, so as to obtain N number of channel estimation value for N number of data flow.

22nd, device as claimed in claim 21, it is characterised in that the processor specifically for：Root According to the virtual time sequence, M+1 frequency domain response estimation subsequence is obtained based on the frequency domain response estimation sequence；M is the integer not less than 0；The M+1 frequency domain response subsequence is changed respectively, obtain that M+1 time domain response estimation sequence is bad to determine the first time domain response estimated sequence, energy leakage value of the energy leakage value less than other time domain response estimated sequences of the first time domain response estimated sequence from the M+1 time domain response estimated sequence.

23rd, device as claimed in claim 22, it is characterised in that the processor specifically for：According to the virtual time adjusting step of determination and the length of the frequency domain response estimation sequence, the M+1 frequency domain response subsequence is obtained based on the frequency domain response estimation sequence；Wherein, the virtual time adjusting step is determined according to the virtual time sequence.

24th, device as claimed in claim 23, it is characterised in that the processor specifically for：Root

;3

According to formula _ '^Λ, obtain the sub- sequence of M+1 frequency domain response estimation

Row；Wherein,^{ίβ Λ}The frequency domain response estimation subsequence is represented, the virtual time adjusting step is represented, The frequency domain response estimation sequence is represented, it is the integer from 0 to M that V is taken respectively.

25th, the device as described in any claims of claim 22-24, it is characterised in that the processor specifically for：Select K sampled point；Energy value sum of the M+1 time domain response estimated sequence on the K sampled point is obtained respectively；The minimum time domain response estimated sequence of energy value sum is defined as the first time domain response estimated sequence.

26th, device as claimed in claim 21, it is characterised in that the processor specifically for：The virtual time sequence is obtained, the virtual time sequence is the time difference between the time delay and time domain sampling point of multipath channel；The frequency domain response estimation sequence according to the virtual time sequence pair is adjusted, and obtains the first frequency domain response estimation subsequence；The first frequency domain response estimation subsequence is changed, the first time domain response estimated sequence is obtained.

27th, device as claimed in claim 26, it is characterised in that the processor specifically for：Root

H k, two H ik^'^

According to formula ^, the first frequency domain response estimation subsequence is obtained； Wherein, The frequency domain response estimation sequence is represented, the virtual time sequence is represented.

28th, the device as described in any claims of claim 21-27, it is characterised in that the processor specifically for：Multiple frequency domain response signals for multiple transmission channels are obtained according to the DMRS sequences；The multiple frequency domain response signal is separated on frequency band, the frequency domain response signal for the transmission channel is obtained；The frequency domain response signal according to corresponding with transmission channel sequence pair is handled, and obtains the frequency domain response estimation sequence.

29th, the device as described in any claims of claim 21-28, it is characterised in that the processor specifically for：According to cyclic shift number, the Ν time domain response estimation subsequence for the Ν data flow is obtained based on the first time domain response estimated sequence.

30th, the device as described in any claims of claim 21-29, it is characterised in that the processor specifically for：Estimate subsequence for each time domain response, convert it to after frequency domain and be multiplied respectively with the virtual time sequence, obtain the Ν frequency domain response estimation subsequence.