CN106899525A - Terminal timing offset method of estimation, device and equipment in multi-point cooperative transmission - Google Patents

Abstract

The invention discloses terminal timing offset method of estimation, device and equipment in a kind of multi-point cooperative transmission, it is used to improve the accuracy of UE reception timings in CoMP.The method is：Determine the signal power of each tap in the time domain channel estimated result of CSI RS pilot frequency sequences, and determine the first average noise power of the time domain channel estimated result, maximum in signal power and the first average noise power according to each tap determine the first threshold value, and the first path position of initial estimation is determined according to the first threshold value；First path position according to initial estimation determines the second average noise power after being adjusted to the timing offset of time domain channel estimated result, maximum in signal power and the second average noise power according to each tap determine the second threshold value, the correction value of the first path position of initial estimation is determined according to the second threshold value, the first path position of initial estimation is modified according to correction value is obtained final timing offset estimate.

Description

Terminal timing offset method of estimation, device and equipment in multi-point cooperative transmission

Technical field

Estimate the present invention relates to terminal timing offset in communication technical field, more particularly to a kind of multi-point cooperative transmission Meter method, device and equipment.

Background technology

Long Term Evolution (Long term Evolution, LTE) system descending is transmitted and uplink all uses base In the orthogonal of OFDM (Orthogonal Frequency Division Multiplexing, OFDM) Multi-access mode, therefore for LTE, inter-cell interference turns into main interference.And with CDMA (Code Division Multiple Access, CDMA) system realizes identical networking using soft capacity not Together, LTE cannot be directly realized by identical networking.Therefore, how inter-cell interference is reduced, realizes identical networking A subject matter as LTE and advanced LTE (Advanced LTE, LTE-A).

In LTE system, mainly by Inter-Cell Interference Coordination (Inter Cell Interference Coordination, ICIC) mode reduces inter-cell interference.Pass through cooperative scheduling different radio resource between base station The transmit power of block reduces the interference of Cell Edge User, so as to realize identical networking.In lte-a system In in order to further reduce the co-channel interference of minizone, reduce minizone by the way of coordinated multipoint transmission Interference, the spectrum efficiency of lifting system particularly lifts the performance of Cell Edge User.

Coordinated multipoint transmission (Coordinated Multiple Points Transmission/Reception, CoMP) Refer to the multiple transmission point on geographical position separate, it is a terminal (User Equipment, UE) to cooperate with Transmission data or joint receive the data that a UE sends.The multiple transmission point of participation cooperation is often referred to many The base station of individual cell.Conventional, multiple transmission point uses different cell IDs (CELLID), but has A kind of scene is as follows：

In macrocell (macro cell) overlay area, head (Remote Radio are zoomed out using low-power radio frequency Head, RRH) heterogeneous network, wherein transmission or receiving point be RRH, with identical with macro cell Cell ID.Because RRH and Macro have identical Cell ID, downstream signal can be increased By force, macro cell are Serving cell.

CoMP characteristics major embodiment is in TM10 (Transmission Mode 10, transmission mode 10), TM10 There are two kinds of UE behaviors：Type A (Type A) and type B (Type B), wherein type A thinks institute It is colocation site to have reference signal, it is not necessary to signaled；Type B thinks that not all reference signal is all Colocation site, only high-level signaling notify reference signal between be quasi- colocation site (Quasi-Co-Location, QCL).

Network-side can notify to include to the information of UE：Cell special reference signal (Cell-specific Reference Signal, CRS) port number, the channel state information reference signals of non-zero power (NZP) Configuration information, the zero energy (ZP) of (Channel State Information Reference Signal, CSI-RS) CSI-RS configuration information, and PQI information (content i.e. in table 1) etc..

If configured to the TM10 patterns of CoMP, type B, each transfer point configuration identical CELLID, CRS pilot tones only are configured in Serving cell, if during terminal reception downlink data not where Serving cell Transfer point, then corresponding CRS pilot tones can not embody downlink reception data some wireless channels decline Characteristic, so needing the CSI-RS based on the non-zero power of transfer point configuration where downlink data to measure.

In CoMP scenes, if the transmission mode of configuration is TM10, when QCL is type B, for one Individual given Serving cell, high-level signaling can be a UE of configuration TM10 at most 4 groups of parameter sets of configuration Share and decoded in Physical Uplink Shared Channel (Physical Uplink Control Channel, PDSCH), As shown in table 1.

Table 1

The value in ' PQI ' domain	Description
		‘00’	The parameter sets 1 of high level configuration
‘01’	The parameter sets 2 of high level configuration
		‘10’	The parameter sets 3 of high level configuration
‘11’	The parameter sets 4 of high level configuration

Wherein, every group of parameter sets (are expressed as CRSport including CRS port numbers_n), ZP CSI-RS match somebody with somebody Confidence breath (is expressed as CSIR S_n,ZP), the configuration information of NZP CSI-RS (be expressed as CSIR S_n,NZP), it is many Broadcast broadcast single frequency network (Multimedia Broadcast Single Frequency Network, MBSFN) mark Knowledge (is expressed as MBSFN_n), frequency deviation (be expressed as Freoff_n), PDSCH resources original position (represent It is PDSCHRB_n) etc. information, wherein 1≤n≤N, N represent the sum of parameter sets.UE need not Know the corresponding relation between configuration information and transfer point, it is only necessary to know the corresponding configuration of this receive information Information is which is organized, and the corresponding relation of configuration information and transfer point is by network-side control.

UE is according to detecting for the UE and the use Downlink Control Information of the given Serving cell Physical Downlink Control Channel (the Physical of (Downlink Control Information, DCI) form 2D Downlink Control Channel, PDCCH)/enhancing Physical Downlink Control Channel (Enhanced PDCCH, EPDCCH) parsed, obtain PQI (PDSCH RE Mapping and Quasi-Co-Location Indicator, PDSCH resource unit mappings and quasi- colocation site are indicated) control information, The PQI control information is the mark of parameter sets, it is assumed that the PQI that UE is detected during the n-th subframe is i, Then information of the UE in corresponding i-th group of parameter sets carries out follow-up data treatment, as shown in figure 1, Processing procedure is specific as follows：

The first step：

During the n-th subframe, configuration information CSIR Ss of the UE according to NZP CSI-RS in i-th group of parameter sets_i,NZP, Determine whether present sub-frame there are NZP CSI-RS, judgment formula is specific as shown in formula (1)：

(10n_f+n-△_CSI-RS)modT_CSI-RS=0 formula (1)

Wherein, n_fRadio Frame Number is represented, n represents subframe sequence number, T_CSI-RSRepresent that the CSI-RS cycles are (single Position is subframe), △_CSI-RSRepresent CSI-RS sub-frame offsets, T_CSI-RSAnd △_CSI-RSConfigured by high level, wherein, " mod " is complementation computing.

Second step：

If UE is calculated according to formula (1) and be have sent CSIR S in the n-th sub-frame system_i,NZPConfiguration NZP CSI-RS, then the configuration information CSIR S according to NZP CSI-RS_i,NZPCalculate the channel of CSI-RS Estimated information, and then the Timing Advance IRT of the n-th subframe is measured according to the channel-estimation information of CSI-RS_i,n, That is the n-th subframe is based on the result that i-th group of parameter sets is measured, and is based on the result that other parameters set is measured It is 0, is expressed as IRT_j,n=0, wherein j ∈ [0,3], and j ≠ i.

If UE is calculated according to formula (1) and is not sent CSIR S in the n-th sub-frame system_i,NZPConfiguration NZP CSI-RS, then the Timing Advance IRT of the n-th subframe_i,nIt is zero, i.e. the n-th subframe is based on i-th group of ginseng Manifold closes the result for measuring, wherein, 0≤i≤3.

3rd step：

Regularly, for every group of parameter sets, (parameter sets refer to table to UE herein respectively for the reception of computing terminal Information in 1) corresponding reception timing is calculated, it is expressed as：Assuming that receiving timing is expressed as timepos_i, Reception timing formula (2) for then corresponding to i-th group of parameter sets is expressed as：

timepos_i=timepos_i+IRT_i,nFormula (2)

Wherein, 0≤i≤3.It is possible to further to the Timing Advance IRT being calculated_i,nCarry out multiframe After average or smoothing processing, then using the Timing Advance after treatment calculate it is corresponding receive timing, it is average or The corresponding Timing Advance of every group of parameter sets is individually processed during smoothing processing.

4th step：

The PQI information that UE is received according to present sub-frame, the corresponding parameter sets of selection PQI information are corresponding Receive timing, as present sub-frame UE reception regularly.According to the difference of PQI information, each subframe Receiving timing may differ greatly, but not influence the signal of terminal to receive and process.

Because the configuration of CSI-RS is discontinuous, under different PQI configurations, the CSI-RS of same parameters set The signal of configuration sends spaced at greater, and causing UE to receive timing can not adjust in time, so in this scheme The accuracy for receiving timing is poor compared to CRS, but because RRH transfer points do not send CRS, can only adopt Calculated with CSI-RS and receive timing.

Because macro cell and RRH belong to different transfer points, the reception between two transmission points is regularly When differing greatly, if receiving the signal of RRH, signal receiving performance according to the timing of macro cell Can be very poor.Also, because RRH does not send CRS, it is impossible to which the measurement result according to RRH obtains accurate Receive timing.Based on this, it is desirable to provide the timing adjusting method of UE in a kind of CoMP, to improve reception The accuracy of timing.

The content of the invention

The embodiment of the present invention provides in a kind of multi-point cooperative transmission terminal timing offset method of estimation, device and sets It is standby, it is used to improve the accuracy of UE reception timings in CoMP.

Concrete technical scheme provided in an embodiment of the present invention is as follows：

Terminal timing offset method of estimation in a kind of multi-point cooperative transmission is the embodiment of the invention provides, including：

It is determined that the channel state information reference signals CSI-RS pilot frequency sequences carried in receiving signal, and really The time domain channel estimated result of the fixed CSI-RS pilot frequency sequences；

Determine the signal power of each tap in the time domain channel estimated result, and determine the time domain channel First average noise power of estimated result, according to the signal work(of each tap in the time domain channel estimated result Maximum and first average noise power in rate determine the first threshold value, according to first thresholding The signal power of each tap in value and the time domain channel estimated result, determines the first footpath position of initial estimation Put；

First path position according to the initial estimation is carried out to the timing offset of the time domain channel estimated result Adjustment, it is determined that adjustment after time domain channel estimated result the second average noise power, according to after adjustment when Maximum and second average noise power in the channel estimation results of domain in the signal power of each tap Determine the second threshold value, respectively taken out according in the time domain channel estimated result after second threshold value and adjustment The signal power of head, determines the correction value of the first path position of the initial estimation, according to the correction value to institute The first path position for stating initial estimation is modified and obtains final timing offset estimate.

In possible implementation method, according in the signal power of each tap in the time domain channel estimated result Maximum and first average noise power determine the first threshold value, including：

The product of first average noise power and the first coefficient is calculated, the first optional threshold value is obtained；

Calculate the maximum and the second coefficient in the signal power of each tap in the time domain channel estimated result Product, obtain the second optional threshold value；

According to the described first optional threshold value and the second optional threshold value, first threshold value is determined.

In possible implementation method, according to the described first optional threshold value and the second optional threshold value, really Fixed first threshold value, including：

Determine that the minimum value in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that the maximum in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that first threshold value is Γ=α Γ₁+(1-α)·Γ₂, wherein, Γ represents first thresholding Value, Γ₁Represent the described first optional threshold value, Γ₂The second optional threshold value is represented, α is default proportion Coefficient, 0≤α≤1.

In possible implementation method, according to each in first threshold value and the time domain channel estimated result The signal power of tap, determines the first path position of initial estimation, including：

Select in the signal power of each tap in the time domain channel estimated result, first is more than described first The tap position of threshold value, the tap position of selection is defined as the first path position of initial estimation.

In possible implementation method, the first path position according to the initial estimation is estimated the time domain channel to tie The timing offset of fruit is adjusted, including：

Using the corresponding tap of first path position of initial estimation described in the time domain channel estimated result as first Beginning tap position, successively translates each tap position in the time domain channel estimated result, obtains timing partially Time domain channel estimated result after difference adjustment.

In possible implementation method, according to the signal power of each tap in the time domain channel estimated result after adjustment In maximum and second average noise power determine the second threshold value, including：

The product of second average noise power and the 3rd coefficient is calculated, the 3rd optional threshold value is obtained；

Calculate maximum in the signal power of each tap in the time domain channel estimated result after the adjustment with The product of the 4th coefficient, obtains the 4th optional threshold value；

According to the 3rd optional threshold value and the 4th optional threshold value, second threshold value is determined.

In possible implementation method, second threshold value is less than first threshold value.

In possible implementation method, according to the time domain channel estimated result after second threshold value and adjustment In each tap signal power, the correction value of the first path position of the initial estimation is determined, according to the amendment Value is modified to the first path position of the initial estimation and obtains final timing offset estimate, including：

Select in the signal power of each tap in the time domain channel estimated result after the adjustment, first is more than The tap position of second threshold value, the tap position of selection is defined as the first footpath position of the initial estimation The correction value put；

The correction value of the first path position of the initial estimation is calculated, with the first path position of the initial estimation With, will obtain and value be defined as final timing offset estimate.

The embodiment of the present invention additionally provides terminal timing offset estimation unit in a kind of multi-point cooperative transmission, bag Include：

First processing module, for determining to receive the channel state information reference signals CSI-RS carried in signal Pilot frequency sequence, and determine the time domain channel estimated result of the CSI-RS pilot frequency sequences；

Second processing module, the signal power for determining each tap in the time domain channel estimated result, with And the first average noise power of the determination time domain channel estimated result, estimated to tie according to the time domain channel Maximum and first average noise power in fruit in the signal power of each tap determine the first thresholding Value, according to the signal power of each tap in first threshold value and the time domain channel estimated result, really Determine the first path position of initial estimation；

3rd processing module, estimates the time domain channel to tie for the first path position according to the initial estimation The timing offset of fruit is adjusted, it is determined that the second average noise work(of the time domain channel estimated result after adjustment Rate, maximum in the signal power of each tap in the time domain channel estimated result after adjustment and described Second average noise power determines the second threshold value, according to the time domain letter after second threshold value and adjustment The signal power of each tap in road estimated result, determines the correction value of the first path position of the initial estimation, root The first path position of the initial estimation is modified according to the correction value obtains final timing offset estimation Value.

In possible implementation method, the Second processing module specifically for：

The product of first average noise power and the first coefficient is calculated, the first optional threshold value is obtained；

Calculate the maximum and the second coefficient in the signal power of each tap in the time domain channel estimated result Product, obtain the second optional threshold value；

According to the described first optional threshold value and the second optional threshold value, first threshold value is determined.

In possible implementation method, the Second processing module specifically for：

Determine that the minimum value in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that the maximum in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that first threshold value is Γ=α Γ₁+(1-α)·Γ₂, wherein, Γ represents first thresholding Value, Γ₁Represent the described first optional threshold value, Γ₂The second optional threshold value is represented, α is default proportion Coefficient, 0≤α≤1.

In possible implementation method, the Second processing module specifically for：

Select in the signal power of each tap in the time domain channel estimated result, first is more than described first The tap position of threshold value, the tap position of selection is defined as the first path position of initial estimation.

In possible implementation method, the 3rd processing module specifically for：

Using the corresponding tap of first path position of initial estimation described in the time domain channel estimated result as first Beginning tap position, successively translates each tap position in the time domain channel estimated result, obtains timing partially Time domain channel estimated result after difference adjustment.

In possible implementation method, the 3rd processing module specifically for：

The product of second average noise power and the 3rd coefficient is calculated, the 3rd optional threshold value is obtained；

Calculate maximum in the signal power of each tap in the time domain channel estimated result after the adjustment with The product of the 4th coefficient, obtains the 4th optional threshold value；

According to the 3rd optional threshold value and the 4th optional threshold value, second threshold value is determined.

In possible implementation method, second threshold value is less than first threshold value.

In possible implementation method, the 3rd processing module specifically for：

Select in the signal power of each tap in the time domain channel estimated result after the adjustment, first is more than The tap position of second threshold value, the tap position of selection is defined as the first footpath position of the initial estimation The correction value put；

The correction value of the first path position of the initial estimation is calculated, with the first path position of the initial estimation With, will obtain and value be defined as final timing offset estimate.

The embodiment of the present invention additionally provides a kind of equipment, and the equipment mainly includes processor and memory, wherein, Default program is preserved in memory, processor is used to read the program preserved in memory, according to the journey Sequence performs procedure below：

It is determined that the channel state information reference signals CSI-RS pilot frequency sequences carried in receiving signal, and really The time domain channel estimated result of the fixed CSI-RS pilot frequency sequences；

Determine the signal power of each tap in the time domain channel estimated result, and determine the time domain channel First average noise power of estimated result, according to the signal work(of each tap in the time domain channel estimated result Maximum and first average noise power in rate determine the first threshold value, according to first thresholding The signal power of each tap in value and the time domain channel estimated result, determines the first footpath position of initial estimation Put；

First path position according to the initial estimation is carried out to the timing offset of the time domain channel estimated result Adjustment, it is determined that adjustment after time domain channel estimated result the second average noise power, according to after adjustment when Maximum and second average noise power in the channel estimation results of domain in the signal power of each tap Determine the second threshold value, respectively taken out according in the time domain channel estimated result after second threshold value and adjustment The signal power of head, determines the correction value of the first path position of the initial estimation, according to the correction value to institute The first path position for stating initial estimation is modified and obtains final timing offset estimate.

In implementation, processor calculates the product of first average noise power and the first coefficient, obtains first Optional threshold value；Calculate maximum in the signal power of each tap in the time domain channel estimated result and the The product of two coefficients, obtains the second optional threshold value；Can according to the described first optional threshold value and described second Threshold value is selected, first threshold value is determined.

In implementation, processor determines the minimum in the described first optional threshold value and the second optional threshold value It is first threshold value to be worth；Or,

Determine that the maximum in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that first threshold value is Γ=α Γ₁+(1-α)·Γ₂, wherein, Γ represents first thresholding Value, Γ₁Represent the described first optional threshold value, Γ₂The second optional threshold value is represented, α is default proportion Coefficient, 0≤α≤1.

In implementation, processor is selected in the signal power of each tap in the time domain channel estimated result, and first The individual tap position more than first threshold value, the tap position of selection is defined as the first footpath of initial estimation Position.

In implementation, processor is corresponding by the first path position of initial estimation described in the time domain channel estimated result Tap as initial tap position, each tap position in the time domain channel estimated result is put down successively Move, obtain the time domain channel estimated result after timing offset adjustment.

In implementation, processor calculates the product of second average noise power and the 3rd coefficient, obtains the 3rd Optional threshold value；Calculate in the signal power of each tap in the time domain channel estimated result after the adjustment most Big value and the product of the 4th coefficient, obtain the 4th optional threshold value；According to the 3rd optional threshold value and institute The 4th optional threshold value is stated, second threshold value is determined.

It is preferred that second threshold value is less than first threshold value.

In implementation, processor selects the signal power of each tap in the time domain channel estimated result after the adjustment In, be defined as the tap position of selection described first by first tap position more than second threshold value The correction value of the first path position that the beginning is estimated；The correction value of the first path position of the initial estimation is calculated, it is and described The sum of the first path position of initial estimation, final timing offset estimate is defined as by obtain and value.

Based on above-mentioned technical proposal, in the embodiment of the present invention, it is determined that receiving the CSI-RS pilot frequency sequences of signal Time domain channel estimated result after, according in the signal power of each tap in the time domain channel estimated result most First average noise power of value, and the time domain channel estimated result greatly, determines the first threshold value, according to The channel power of each tap, determines initial estimation in first threshold value and the time domain channel estimated result First path position, the first path position according to the initial estimation carries out rough timing to the time domain channel estimated result After deviation adjusting, it is determined that the second average noise power of the time domain channel estimated result after adjustment, according to adjustment Maximum and the second average noise work(in time domain channel estimated result afterwards in the signal power of each tap Rate, determines the second threshold value, is respectively taken out according in the time domain channel estimated result after the second threshold value and adjustment The signal power of head, it is determined that the correction value of the first path position to initial estimation, according to the correction value to initially estimating The first path position of meter is modified, and obtains accurate timing offset estimate such that it is able in CoMP scenes Under carry out accurate timing offset estimation, and then estimate to obtain accurate time delay according to the accurate timing offset Extension and timing information, improve the accuracy that UE receives timing.

Brief description of the drawings

Fig. 1 is the process schematic of terminal reception timing under CoMP scenes；

Fig. 2 be the embodiment of the present invention in CoMP terminal timing offset estimate method flow schematic diagram；

Fig. 3 is the channel estimation tap distribution situation schematic diagram under preferable timing cases in the embodiment of the present invention；

Fig. 4 a are the advanced channel estimation tap distribution schematic diagram of timing in the specific embodiment of the invention one；

Fig. 4 b are the channel estimation tap distribution schematic diagram after the alignment of the specific embodiment of the invention one；

Fig. 5 a are the delayed channel estimation tap distribution schematic diagram of timing in the specific embodiment of the invention two；

Fig. 5 b are the channel estimation tap distribution schematic diagram after the specific embodiment of the invention two is calibrated；

Fig. 6 is apparatus structure schematic diagram in the embodiment of the present invention；

Fig. 7 is device structure schematic diagram in the embodiment of the present invention.

Specific embodiment

In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing to this hair It is bright to be described in further detail, it is clear that described embodiment is only a part of embodiment of the invention, Rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing Go out all other embodiment obtained under the premise of creative work, belong to the scope of protection of the invention.

Delay spread is obtained by the effective diameter of measurement signal, i.e. the tail footpath of effective diameter subtracts the head of effective diameter The measurement result in footpath, as delay spread.If it is inaccurate that terminal receives timing adjustment, signal effective diameter First footpath is advanced or delayed too many, will result in effective diameter exit window, i.e. noise window comprising effective diameter and effectively The search space in footpath is inaccurate, directly affects the calculating of effective diameter thresholding, so as to influence delay spread to measure.

The timing adjusting method of a kind of CoMP system proposed by the present invention, under solving under CoMP scenes Row data reception processing, main thought is：By the time domain channel estimated result of CSI-RS by limiting thresholding Mode, obtain initial estimation effective diameter head footpath position, then adjust time domain channel estimated result in should Position to the zero time-domain taps position of the effective diameter head path positions of initial estimation, by the time domain letter after adjustment Road estimated result determines first footpath and the tail footpath of effective diameter by way of comparing with setting thresholding, final to obtain Delay spread measurement result.

As shown in Fig. 2 in the embodiment of the present invention, the method detailed that terminal timing offset is estimated in CoMP Flow is as follows：

Step 201：It is determined that the CSI-RS pilot frequency sequences carried in receiving signal, and determine the CSI-RS The time domain channel estimated result of pilot frequency sequence.

In specific implementation, after antenna port receives signal, the docking collection of letters number carries out time-frequency convert and turns terminal Frequency-region signal is changed to, data pick-up, the i.e. configuration information according to CSI-RS is carried out to frequency-region signal and is extracted The reception data G of CSI-RS pilot frequency locations_f, the configuration information acquisition CSI-RS pilot tone sequences according to CSI-RS Row, are designated as R, calculate the channel estimation in frequency domain result of CSI-RS, are formulated as： Wherein, H_fRepresent the channel estimation in frequency domain result of CSI-RS.

The channel estimation in frequency domain result of the CSI-RS obtained to estimation carries out inverse discrete Fourier transform (Inverse Discrete Fourier Transform, IDFT), time domain channel estimated result is obtained, it is expressed as： H_t=IDFT (H_f), wherein, H_tRepresent time domain channel estimated result.

Step 202：Determine the signal power of each tap in time domain channel estimated result, and determine the time domain First average noise power of channel estimation results, according to the signal of each tap in the time domain channel estimated result Maximum and first average noise power in power determine the first threshold value, according to first threshold value And in the time domain channel estimated result each tap signal power, determine the first path position of initial estimation.

In implementation, the noise window of time domain channel estimated result is intercepted, calculate the first average noise power, wherein, Noise window is according to the length for following bad prefix (Cyclic Prefix, the CP) determination for receiving signal, i.e. noise window It is scope determined by the tail footpath position from the position where maximum CP length to time domain channel estimation results.

In implementation, determine that the detailed process of the first threshold value is as follows：

The product of the first average noise power and the first coefficient is calculated, the first optional threshold value is obtained；During calculating Maximum and the product of the second coefficient in the channel estimation results of domain in the signal power of each tap, obtain second Optional threshold value；According to the first optional threshold value and the second optional threshold value, the first threshold value is determined.

Wherein, the first optional threshold value is represented by：Γ₁=β₁·P_noise, wherein β₁Represent the first coefficient, P_noise The first average noise power is represented, first coefficient can determine by emulating, it is also possible to according to engine request It is determined that.

Wherein, the second optional threshold value is represented by：Γ₂=β₂·P_max, wherein β₂The second coefficient is represented, P_maxThe maximum in the signal power of each tap in time domain channel estimated result is represented, the second coefficient can lead to Cross emulation to determine, it is also possible to determined according to engine request.

In implementation, the first threshold value is determined according to the first optional threshold value and the second optional threshold value, including but It is not limited to following three kinds of implementations：

First, the minimum value in the first optional threshold value and the second optional threshold value is determined for the first threshold value, It is expressed as：Γ=min (Γ₁,Γ₂), wherein, Γ represents the first threshold value, Γ₁The first optional threshold value is represented, Γ₂Represent the second optional threshold value.

The first threshold value that the first implementation determines is less than normal, and the channel estimation head path positions of search are advanced.

Second, the maximum in the first optional threshold value and the second optional threshold value is determined for the first threshold value, It is expressed as：Γ=max (Γ₁,Γ₂), wherein, Γ represents the first threshold value, Γ₁The first optional threshold value is represented, Γ₂Represent the second optional threshold value.

First threshold value of second implementation determination is bigger than normal, and the channel estimation head path positions of search are delayed.

3rd, determine that the first threshold value is Γ=α Γ₁+(1-α)·Γ₂, wherein, Γ represents the first threshold value, Γ₁Represent the first optional threshold value, Γ₂The second optional threshold value is represented, α is default specific gravity factor, 0≤α≤1。

In practical application, in the case where reception signal has low signal-to-noise ratio characteristic, that is, the letter of signal is being received Make an uproar than in the case of less than predetermined threshold value, Γ₁Measurement is relatively more accurate, selects Γ₁As the first threshold value Γ, Channel estimation head path positions can more accurately be obtained.There is high s/n ratio characteristic signal is received Under, i.e., in the case where the signal to noise ratio for receiving signal is higher than predetermined threshold value, Γ₂Measurement is relatively more accurate, selects Γ₂ As the first threshold value Γ, channel estimation head path positions can be more accurately obtained.

In implementation, in selection time domain channel estimated result in the signal power of each tap, first is more than first The tap position of threshold value, the tap position of selection is defined as the first path position of initial estimation, is designated as τ₁。

Step 203：First path position according to initial estimation is carried out to the timing offset of time domain channel estimated result Adjustment, it is determined that adjustment after time domain channel estimated result the second average noise power, according to after adjustment when Maximum and second average noise power in the channel estimation results of domain in the signal power of each tap is true Fixed second threshold value, according to each tap in the time domain channel estimated result after second threshold value and adjustment Signal power, determines the correction value of the first path position of the initial estimation, according to the correction value to initial estimation First path position is modified and obtains final timing offset estimate.

In implementation, using the corresponding tap of first path position of initial estimation in time domain channel estimated result as initial Tap position, successively translates each tap position in the time domain channel estimated result, obtains timing offset and adjusts Time domain channel estimated result after whole.

Specifically, by tap position τ in time domain channel estimated result₁Channel estimation value, move to tap zero Position, each tap position in time domain channel estimated result is translated successively according to the rule, determined When deviation adjusting after time domain channel estimated result.

Specifically, the noise window of the time domain channel estimated result after interception adjustment, calculates the second average noise work( Rate.The noise window that second average noise power is used when calculating, uses when being calculated with the first average noise power Noise window it is identical.

In implementation, determine that the detailed process of the second threshold value is as follows：

The product of the second average noise power and the 3rd coefficient is calculated, the 3rd optional threshold value is obtained；Calculate and adjust The product of maximum and the 4th coefficient in the time domain channel estimated result after whole in the signal power of each tap, Obtain the 4th optional threshold value；According to the 3rd optional threshold value and the 4th optional threshold value, the second thresholding is determined Value.

It is preferred that the second threshold value is less than the first threshold value, to ensure subsequently entered according to second threshold value When row head path positions and tail footpath location finding, the tap of all useful signals is all most in time domain channel estimated result Possibly cover in hunting zone.

Wherein, the 3rd optional threshold value is represented by：Γ'₁=β '₁·P′_noise, wherein Γ '₁Represent the 3rd coefficient, P '_noise The second average noise power is represented, the 3rd coefficient can determine by emulating, it is also possible to according to engine request It is determined that.

Wherein, the 4th optional threshold value is represented by：Γ'₂=β '₂·P_max, wherein Γ '₂The 4th coefficient is represented, P_maxThe maximum in the signal power of each tap in time domain channel estimated result is represented, the 4th coefficient can lead to Cross emulation to determine, it is also possible to determined according to engine request.

Specifically, β '₁Value be less than β₁, β '₂Value be less than β₂, with the second threshold value for ensureing to determine Less than the first threshold value.

Wherein, the second threshold value is determined according to the 3rd optional threshold value and the 4th optional threshold value, including but not It is limited to following three kinds of implementations：

First, the minimum value in the 3rd optional threshold value and the 4th optional threshold value is determined for the second threshold value, It is expressed as：Γ '=min (Γ '₁,Γ'₂), wherein, Γ ' represents the second threshold value, Γ '₁Represent the 3rd optional thresholding Value, Γ '₂Represent the 4th optional threshold value.

The second threshold value that the first implementation determines is less than normal, and the channel estimation head path positions of search are advanced.

Second, the maximum in the 3rd optional threshold value and the 4th optional threshold value is determined for the second threshold value, It is expressed as：Γ '=max (Γ '₁,Γ'₂), wherein, Γ ' represents the second threshold value, Γ '₁Represent the 3rd optional thresholding Value, Γ '₂Represent the 4th optional threshold value.

Second threshold value of second implementation determination is bigger than normal, and the channel estimation head path positions of search are delayed.

3rd, determine that the second threshold value is Γ '=α Γ '₁+(1-α)·Γ'₂, wherein, Γ ' represents the second thresholding Value, Γ '₁Represent the first optional threshold value, Γ '₂The second optional threshold value is represented, α is default specific gravity factor, 0≤α≤1。

In practical application, in the case where reception signal has low signal-to-noise ratio characteristic, that is, the letter of signal is being received Make an uproar than in the case of less than predetermined threshold value, Γ '₁Measurement is relatively more accurate, selects Γ '₁As the second threshold value Γ ', The correction value of the first path position of initial estimation can more accurately be obtained.There is high s/n ratio signal is received In the case of characteristic, i.e., in the case where the signal to noise ratio for receiving signal is higher than predetermined threshold value, Γ '₂Measurement is than calibrated Really, Γ ' is selected₂Used as the second threshold value Γ ', the first path position that can more accurately obtain initial estimation is repaiied On the occasion of.

Specifically, it is determined that the process of final timing offset estimate is：

In time domain channel estimated result after selection adjustment in the signal power of each tap, first is more than second The tap position of threshold value, the tap position of selection is defined as the correction value of the first path position of initial estimation； Calculate initial estimation first path position correction value, it is first path position with initial estimation and, the sum that will be obtained Value is defined as final timing offset estimate.

In implementation, tap power is more than the of the second threshold value in the time domain channel estimated result after search adjustment One tap position (is expressed as τ_start) and last tap position (be expressed as τ_end), delay spread value It is expressed as：τ '=τ_end-τ_start, the first tap position τ_startThe as correction value of the first path position of initial estimation, The first path position of initial estimation is modified using the correction value, obtains final timing offset estimate, It is expressed as:τ′₁=τ₁+τ_start, wherein, τ '₁Represent final timing offset estimate, τ₁Represent initial estimation First path position.

Further, deviation adjusting is timed according to the final timing offset estimate docking collection of letters number, is led to The precision for improving timing offset adjustment is crossed, with reference to the accurate measurement of delay spread, the performance of receiver is improved.

In, at least following two specific embodiments：

Scheme one, is based respectively on the reception signal of each receiving port of each reception antenna, according to step 201 Process described by step 203 calculates each final timing offset estimate, calculates each reception antenna The corresponding final timing offset estimate in each port average value, as the timing offset that terminal is final Estimate.

Scheme two, respectively for each self-corresponding first threshold value in each port of each reception antenna and second Threshold value, calculates the average value of each first threshold value as the first thresholding for being finally timed estimation of deviation Value, and calculate the average value of each second threshold value and be the most finally timed the second thresholding of estimation of deviation Value.Calculate the time domain channel estimated result of the reception signal of each port of each reception antenna power it is flat Average.Calculate the average value of the first average noise power of the reception signal of each port of each reception antenna With the average value of the second average noise power.During step 201 is described to step 203, use The average value of the first threshold value replaces the first threshold value, and the average value using the second threshold value replaces the second thresholding Value, the average value using the first average noise power replaces the first average noise power, is averagely made an uproar using second The average value of acoustical power replaces the second average noise power, using time domain channel estimated result power it is average The signal power of each tap in the signal power substitution time domain channel estimated result of each tap in value, according to step Process described by 201 to step 203 determines the final timing offset estimate of terminal.

Enter below by way of the timing offset estimation procedure that two specific embodiments are provided the embodiment of the present invention Row is illustrated.

Assuming that IDFT length is expressed as N_FFT, it is contemplated that changing commanders frequency-domain transform using IDFT changes can to time domain Signal power leakage can occur, N can be retained_FFTN_leakThe tap scope in bar footpath, i.e. time domain channel estimation From [- N_leak:N_FFT-N_leak], noise window is [N_τ:N_FFT-N_leak], N_τIt is the corresponding tap position of CP length. Ideally, maximum tap position be located at tap 0 position, available signal power be distributed in noise window it Outward, it is illustrated in figure 3 the channel estimation tap distribution situation schematic diagram under preferable timing cases.

Specific embodiment one：

Assuming that N_FFT=128, N_leak=20, N_τ=80, then noise window is [80,108], useful signal tap model Enclose is [- 20:79], timing advance is 30, as shown in Figure 4 a the advanced channel estimation tap distribution of timing Schematic diagram, in the case where timing is advanced, part useful signal has been included into the scope of noise window, direct root Thresholding is calculated according to the noise power of mixing useful signal obtain delay spread and timing offset information, error ratio It is larger, so needs are calibrated according to the timing offset of rough estimate to channel estimation, it is assumed that rough estimate The first path position τ for going out₁It is 20, then the channel estimation tap after calibrating is distributed as shown in Figure 4 b, in noise window Not comprising useful signal tap, extended and fixed according to noise power and signal power estimation time delay on this basis When deviation, precision can be improved.

Specific embodiment two：

Assuming that N_FFT=128, N_leak=20, N_τ=80, then noise window is [80,108], useful signal tap model Enclose is [- 20:79], timing hysteresis is 30, as shown in Figure 5 a for the delayed channel estimation tap of timing is distributed Schematic diagram, in the case where timing is delayed, part useful signal has been included into noise window in noise window afterbody Scope, thresholding is directly calculated according to the noise power for mixing useful signal and obtains delay spread and timing offset Information, application condition is big, so the timing offset first according to rough estimate is calibrated to channel estimation, Assuming that the first path position τ for estimating₁It is -20, then the channel estimation tap after calibrating is distributed as shown in Figure 5 b, Useful signal tap is not included in noise window, when estimating again according to noise power and signal power on this basis Prolong extension and timing offset, precision can be improved.

Based on same inventive concept, terminal timing offset is estimated in providing a kind of CoMP in the embodiment of the present invention Counter device, the specific implementation of the device can be found in the description of above method embodiment, repeats part and repeats no more, As shown in fig. 6, the device mainly includes：

First processing module 601, for determining to receive the channel state information reference signals carried in signal CSI-RS pilot frequency sequences, and determine the time domain channel estimated result of the CSI-RS pilot frequency sequences；

Second processing module 602, the signal power for determining each tap in the time domain channel estimated result, And the first average noise power of the determination time domain channel estimated result, estimated according to the time domain channel Maximum and first average noise power in result in the signal power of each tap determine first Limit value, according to the signal power of each tap in first threshold value and the time domain channel estimated result, Determine the first path position of initial estimation；

3rd processing module 603, estimates for the first path position according to the initial estimation to the time domain channel The timing offset for counting result is adjusted, it is determined that the second average noise of the time domain channel estimated result after adjustment Power, maximum and institute in the signal power of each tap in the time domain channel estimated result after adjustment State the second average noise power and determine the second threshold value, according to the time domain after second threshold value and adjustment The signal power of each tap in channel estimation results, determines the correction value of the first path position of the initial estimation, The first path position of the initial estimation is modified according to the correction value is obtained final timing offset and is estimated Evaluation.

In implementation, the Second processing module specifically for：

The product of first average noise power and the first coefficient is calculated, the first optional threshold value is obtained；

Calculate the maximum and the second coefficient in the signal power of each tap in the time domain channel estimated result Product, obtain the second optional threshold value；

According to the described first optional threshold value and the second optional threshold value, first threshold value is determined.

In implementation, the Second processing module specifically for：

Determine that the minimum value in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that the maximum in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that first threshold value is Γ=α Γ₁+(1-α)·Γ₂, wherein, Γ represents first thresholding Value, Γ₁Represent the described first optional threshold value, Γ₂The second optional threshold value is represented, α is default proportion Coefficient, 0≤α≤1.

In implementation, the Second processing module specifically for：

Select in the signal power of each tap in the time domain channel estimated result, first is more than described first The tap position of threshold value, the tap position of selection is defined as the first path position of initial estimation.

In implementation, the 3rd processing module specifically for：

Using the corresponding tap of first path position of initial estimation described in the time domain channel estimated result as first Beginning tap position, successively translates each tap position in the time domain channel estimated result, obtains timing partially Time domain channel estimated result after difference adjustment.

In implementation, the 3rd processing module specifically for：

The product of second average noise power and the 3rd coefficient is calculated, the 3rd optional threshold value is obtained；

Calculate maximum in the signal power of each tap in the time domain channel estimated result after the adjustment with The product of the 4th coefficient, obtains the 4th optional threshold value；

According to the 3rd optional threshold value and the 4th optional threshold value, second threshold value is determined.

It is preferred that second threshold value is less than first threshold value.

In implementation, the 3rd processing module specifically for：

Select in the signal power of each tap in the time domain channel estimated result after the adjustment, first is more than The tap position of second threshold value, the tap position of selection is defined as the first footpath position of the initial estimation The correction value put；

The correction value of the first path position of the initial estimation is calculated, with the first path position of the initial estimation With, will obtain and value be defined as final timing offset estimate.

Based on same inventive concept, the embodiment of the present invention additionally provides a kind of equipment, the specific implementation of the equipment Reference can be made to the description of above method embodiment, repeats part and repeats no more, as shown in fig. 7, the equipment is main Including processor 701 and memory 702, wherein, default program is preserved in memory 702, process Device 701 is used to read the program preserved in memory 702, and procedure below is performed according to the program：

It is determined that the channel state information reference signals CSI-RS pilot frequency sequences carried in receiving signal, and really The time domain channel estimated result of the fixed CSI-RS pilot frequency sequences；

Determine the signal power of each tap in the time domain channel estimated result, and determine the time domain channel First average noise power of estimated result, according to the signal work(of each tap in the time domain channel estimated result Maximum and first average noise power in rate determine the first threshold value, according to first thresholding The signal power of each tap in value and the time domain channel estimated result, determines the first footpath position of initial estimation Put；

First path position according to the initial estimation is carried out to the timing offset of the time domain channel estimated result Adjustment, it is determined that adjustment after time domain channel estimated result the second average noise power, according to after adjustment when Maximum and second average noise power in the channel estimation results of domain in the signal power of each tap Determine the second threshold value, respectively taken out according in the time domain channel estimated result after second threshold value and adjustment The signal power of head, determines the correction value of the first path position of the initial estimation, according to the correction value to institute The first path position for stating initial estimation is modified and obtains final timing offset estimate.

In implementation, processor calculates the product of first average noise power and the first coefficient, obtains first Optional threshold value；Calculate maximum in the signal power of each tap in the time domain channel estimated result and the The product of two coefficients, obtains the second optional threshold value；Can according to the described first optional threshold value and described second Threshold value is selected, first threshold value is determined.

In implementation, processor determines the minimum in the described first optional threshold value and the second optional threshold value It is first threshold value to be worth；Or,

Determine that the maximum in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that first threshold value is Γ=α Γ₁+(1-α)·Γ₂, wherein, Γ represents first thresholding Value, Γ₁Represent the described first optional threshold value, Γ₂The second optional threshold value is represented, α is default proportion Coefficient, 0≤α≤1.

In implementation, processor is selected in the signal power of each tap in the time domain channel estimated result, and first The individual tap position more than first threshold value, the tap position of selection is defined as the first footpath of initial estimation Position.

In implementation, processor is corresponding by the first path position of initial estimation described in the time domain channel estimated result Tap as initial tap position, each tap position in the time domain channel estimated result is put down successively Move, obtain the time domain channel estimated result after timing offset adjustment.

In implementation, processor calculates the product of second average noise power and the 3rd coefficient, obtains the 3rd Optional threshold value；Calculate in the signal power of each tap in the time domain channel estimated result after the adjustment most Big value and the product of the 4th coefficient, obtain the 4th optional threshold value；According to the 3rd optional threshold value and institute The 4th optional threshold value is stated, second threshold value is determined.

It is preferred that second threshold value is less than first threshold value.

In implementation, processor selects the signal power of each tap in the time domain channel estimated result after the adjustment In, be defined as the tap position of selection described first by first tap position more than second threshold value The correction value of the first path position that the beginning is estimated；The correction value of the first path position of the initial estimation is calculated, it is and described The sum of the first path position of initial estimation, final timing offset estimate is defined as by obtain and value.

Wherein, processor and memory are connected by bus, and bus architecture can include any number of interconnection Bus and bridge, the memory that the one or more processors for specifically being represented by processor and memory are represented Various circuits are linked together.Bus architecture can also be by such as ancillary equipment, voltage-stablizer and power management electricity Various other circuits on road or the like are linked together, and these are all it is known in the art, therefore, herein No longer it is described further.EBI provides interface.Processor is responsible for bus architecture and is led to Normal treatment, memory can store the data that processor is used when operation is performed.

With reference to concrete application scene, the equipment can be terminal.

Based on above-mentioned technical proposal, in the embodiment of the present invention, it is determined that receiving the CSI-RS pilot frequency sequences of signal Time domain channel estimated result after, according in the signal power of each tap in the time domain channel estimated result most First average noise power of value, and the time domain channel estimated result greatly, determines the first threshold value, according to The channel power of each tap, determines initial estimation in first threshold value and the time domain channel estimated result First path position, the first path position according to the initial estimation carries out rough timing to the time domain channel estimated result After deviation adjusting, it is determined that the second average noise power of the time domain channel estimated result after adjustment, according to adjustment Maximum and the second average noise work(in time domain channel estimated result afterwards in the signal power of each tap Rate, determines the second threshold value, is respectively taken out according in the time domain channel estimated result after the second threshold value and adjustment The signal power of head, it is determined that the correction value of the first path position to initial estimation, according to the correction value to initially estimating The first path position of meter is modified, and obtains accurate timing offset estimate such that it is able in CoMP scenes Under carry out accurate timing offset estimation, and then estimate to obtain accurate time delay according to the accurate timing offset Extension and timing information, improve the accuracy that UE receives timing.

It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or meter Calculation machine program product.Therefore, the present invention can be using complete hardware embodiment, complete software embodiment or knot Close the form of the embodiment in terms of software and hardware.And, the present invention can be used and wherein wrapped at one or more Containing computer usable program code computer-usable storage medium (including but not limited to magnetic disk storage and Optical memory etc.) on implement computer program product form.

The present invention is produced with reference to method according to embodiments of the present invention, equipment (system) and computer program The flow chart and/or block diagram of product is described.It should be understood that can by computer program instructions realize flow chart and / or block diagram in each flow and/or the flow in square frame and flow chart and/or block diagram and/ Or the combination of square frame.These computer program instructions to all-purpose computer, special-purpose computer, insertion can be provided The processor of formula processor or other programmable data processing devices is producing a machine so that by calculating The instruction of the computing device of machine or other programmable data processing devices is produced for realizing in flow chart one The device of the function of being specified in individual flow or multiple one square frame of flow and/or block diagram or multiple square frames.

These computer program instructions may be alternatively stored in can guide computer or the treatment of other programmable datas to set In the standby computer-readable memory for working in a specific way so that storage is in the computer-readable memory Instruction produce include the manufacture of command device, the command device realization in one flow of flow chart or multiple The function of being specified in one square frame of flow and/or block diagram or multiple square frames.

These computer program instructions can be also loaded into computer or other programmable data processing devices, made Obtain and series of operation steps is performed on computer or other programmable devices to produce computer implemented place Reason, so as to the instruction performed on computer or other programmable devices is provided for realizing in flow chart one The step of function of being specified in flow or multiple one square frame of flow and/or block diagram or multiple square frames.

Obviously, those skilled in the art can carry out various changes and modification without deviating from this hair to the present invention Bright spirit and scope.So, if it is of the invention these modification and modification belong to the claims in the present invention and Within the scope of its equivalent technologies, then the present invention is also intended to comprising these changes and modification.

Claims (16)

1. terminal timing offset method of estimation in a kind of multi-point cooperative transmission, it is characterised in that including：

It is determined that the channel state information reference signals CSI-RS pilot frequency sequences carried in receiving signal, and really The time domain channel estimated result of the fixed CSI-RS pilot frequency sequences；

Determine the signal power of each tap in the time domain channel estimated result, and determine the time domain channel First average noise power of estimated result, according to the signal work(of each tap in the time domain channel estimated result Maximum and first average noise power in rate determine the first threshold value, according to first thresholding The signal power of each tap in value and the time domain channel estimated result, determines the first footpath position of initial estimation Put；

First path position according to the initial estimation is carried out to the timing offset of the time domain channel estimated result Adjustment, it is determined that adjustment after time domain channel estimated result the second average noise power, according to after adjustment when Maximum and second average noise power in the channel estimation results of domain in the signal power of each tap Determine the second threshold value, respectively taken out according in the time domain channel estimated result after second threshold value and adjustment The signal power of head, determines the correction value of the first path position of the initial estimation, according to the correction value to institute The first path position for stating initial estimation is modified and obtains final timing offset estimate.

2. the method for claim 1, it is characterised in that according to the time domain channel estimated result In each tap signal power in maximum and first average noise power determine the first threshold value, Including：

The product of first average noise power and the first coefficient is calculated, the first optional threshold value is obtained；

Calculate the maximum and the second coefficient in the signal power of each tap in the time domain channel estimated result Product, obtain the second optional threshold value；

According to the described first optional threshold value and the second optional threshold value, first threshold value is determined.

3. method as claimed in claim 2, it is characterised in that according to the described first optional threshold value and The second optional threshold value, determines first threshold value, including：

Determine that the minimum value in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that the maximum in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that first threshold value is Γ=α Γ₁+(1-α)·Γ₂, wherein, Γ represents first thresholding Value, Γ₁Represent the described first optional threshold value, Γ₂The second optional threshold value is represented, α is default proportion Coefficient, 0≤α≤1.

4. method as claimed in claim 2, it is characterised in that according to first threshold value and institute The signal power of each tap in time domain channel estimated result is stated, the first path position of initial estimation is determined, including：

Select in the signal power of each tap in the time domain channel estimated result, first is more than described first The tap position of threshold value, the tap position of selection is defined as the first path position of initial estimation.

5. the method as described in claim any one of 1-4, it is characterised in that according to the initial estimation First path position the timing offset of the time domain channel estimated result is adjusted, including：

Using the corresponding tap of first path position of initial estimation described in the time domain channel estimated result as first Beginning tap position, successively translates each tap position in the time domain channel estimated result, obtains timing partially Time domain channel estimated result after difference adjustment.

6. method as claimed in claim 5, it is characterised in that estimated according to the time domain channel after adjustment Maximum and second average noise power in result in the signal power of each tap determine second Limit value, including：

The product of second average noise power and the 3rd coefficient is calculated, the 3rd optional threshold value is obtained；

Calculate maximum in the signal power of each tap in the time domain channel estimated result after the adjustment with The product of the 4th coefficient, obtains the 4th optional threshold value；

According to the 3rd optional threshold value and the 4th optional threshold value, second threshold value is determined.

7. method as claimed in claim 6, it is characterised in that second threshold value is less than described the One threshold value.

8. method as claimed in claims 6 or 7, it is characterised in that according to second threshold value with And adjustment after time domain channel estimated result in each tap signal power, determine the first footpath of the initial estimation The correction value of position, is modified to the first path position of the initial estimation according to the correction value and obtains final Timing offset estimate, including：

Select in the signal power of each tap in the time domain channel estimated result after the adjustment, first is more than The tap position of second threshold value, the tap position of selection is defined as the first footpath position of the initial estimation The correction value put；

The correction value of the first path position of the initial estimation is calculated, with the first path position of the initial estimation With, will obtain and value be defined as final timing offset estimate.

9. terminal timing offset estimation unit in a kind of multi-point cooperative transmission, it is characterised in that including：

First processing module, for determining to receive the channel state information reference signals CSI-RS carried in signal Pilot frequency sequence, and determine the time domain channel estimated result of the CSI-RS pilot frequency sequences；

Second processing module, the signal power for determining each tap in the time domain channel estimated result, with And the first average noise power of the determination time domain channel estimated result, estimated to tie according to the time domain channel Maximum and first average noise power in fruit in the signal power of each tap determine the first thresholding Value, according to the signal power of each tap in first threshold value and the time domain channel estimated result, really Determine the first path position of initial estimation；

3rd processing module, estimates the time domain channel to tie for the first path position according to the initial estimation The timing offset of fruit is adjusted, it is determined that the second average noise work(of the time domain channel estimated result after adjustment Rate, maximum in the signal power of each tap in the time domain channel estimated result after adjustment and described Second average noise power determines the second threshold value, according to the time domain letter after second threshold value and adjustment The signal power of each tap in road estimated result, determines the correction value of the first path position of the initial estimation, root The first path position of the initial estimation is modified according to the correction value obtains final timing offset estimation Value.

10. device as claimed in claim 9, it is characterised in that the Second processing module specifically for：

The product of first average noise power and the first coefficient is calculated, the first optional threshold value is obtained；

Calculate the maximum and the second coefficient in the signal power of each tap in the time domain channel estimated result Product, obtain the second optional threshold value；

According to the described first optional threshold value and the second optional threshold value, first threshold value is determined.

11. devices as claimed in claim 10, it is characterised in that the Second processing module is specifically used In：

Determine that the minimum value in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that the maximum in the described first optional threshold value and the second optional threshold value is described first Threshold value；Or,

Determine that first threshold value is Γ=α Γ₁+(1-α)·Γ₂, wherein, Γ represents first thresholding Value, Γ₁Represent the described first optional threshold value, Γ₂The second optional threshold value is represented, α is default proportion Coefficient, 0≤α≤1.

12. devices as claimed in claim 10, it is characterised in that the Second processing module is specifically used In：

Select in the signal power of each tap in the time domain channel estimated result, first is more than described first The tap position of threshold value, the tap position of selection is defined as the first path position of initial estimation.

13. device as described in claim any one of 9-12, it is characterised in that the 3rd treatment mould Block specifically for：

Using the corresponding tap of first path position of initial estimation described in the time domain channel estimated result as first Beginning tap position, successively translates each tap position in the time domain channel estimated result, obtains timing partially Time domain channel estimated result after difference adjustment.

14. devices as claimed in claim 13, it is characterised in that the 3rd processing module is specifically used In：

The product of second average noise power and the 3rd coefficient is calculated, the 3rd optional threshold value is obtained；

Calculate maximum in the signal power of each tap in the time domain channel estimated result after the adjustment with The product of the 4th coefficient, obtains the 4th optional threshold value；

According to the 3rd optional threshold value and the 4th optional threshold value, second threshold value is determined.

15. devices as claimed in claim 14, it is characterised in that second threshold value is less than described First threshold value.

16. device as described in claims 14 or 15, it is characterised in that the 3rd processing module tool Body is used for：

Select in the signal power of each tap in the time domain channel estimated result after the adjustment, first is more than The tap position of second threshold value, the tap position of selection is defined as the first footpath position of the initial estimation The correction value put；

The correction value of the first path position of the initial estimation is calculated, with the first path position of the initial estimation With, will obtain and value be defined as final timing offset estimate.