CN102833849A - Positioning method and user equipment - Google Patents

Abstract

The invention discloses a positioning method and user equipment. The positioning method includes acquiring the FFT (fast Fourier transform)/IFFT (inverse fast Fourier transform) point Ncorr which is used for PRS (position reference signal) correlation operation; acquiring the IFFT point Nifft-ofdm used for OFDM (orthogonal frequency division multiplexing) symbols corresponding to PRS bandwidth of a cell; receiving a PRS receiving sequence in the occasion according to a normal sampling rate to generate a PRS local sequence without CP(cyclic prefix) in the cell when the Nifft-ofdm is larger than or equal to half the Ncorr, and carrying out correlation operation for the PRS local sequence without the CP and the PRS receiving sequence which is received according to the normal sampling rate on the basis of the Ncorr so as to acquire an arrival time of the PRS of the cell and realize OTDOA (observation time difference of arrival) positioning. The Ncorr is a preset value which cannot change along with the PRS bandwidth and is smaller than or equal to 2048. Due to the FFT/IFFT point Ncorr, which is used for the PRS (position reference signal) correlation operation, does not change along with the PRS bandwidth and is not higher than 2048, the requirements of fast correlation to FFT/IFFT resources can be lowered.

Description

The method and the subscriber equipment of location

Technical field

The present invention relates to the communications field, and more specifically, relate to the method and the subscriber equipment of location.

Background technology

LTE (Long Term Evolution; Long Term Evolution) R9 (release9; Emission PRS (Position Reference Signal is proposed version 9); Location reference signals), realize OTDOA (Observation Time Difference of Arrival, observation arrives the time difference) location technology.The OTDOA location technology is the auxiliary localization method in terminal in.It is base station PRS signal; The terminal receives the PRS signal that send each base station in PRS measuring machine meeting (occasion); Measure each base station and send the difference RSTD (Reference Signal Time difference, the reference signal time difference) time of advent of PRS signal, and report the base station.Hyperbolic fix is carried out according to RSTD in the base station, obtains the terminal location of estimating.

The method of terminal measure R STD is:

1) time of advent of measurement Serving cell PRS signal;

2) time of advent of measurement neighbor cell PRS signal;

3) subtract the time of advent of Serving cell PRS signal time of advent of neighbor cell PRS signal, obtain the RSTD of the relative Serving cell of each neighbor cell.

Wherein, the method for the time of advent of terminal measurement single subdistrict PRS signal is:

1) receives the OTDOA positioning auxiliary information that send the base station.

2) according to the PRS information of this sub-district in the assistance messages, produce a plurality of PRS subframes one by one, the symbol that wherein contains the PRS signal adopts following method to produce, and other symbols are filled zero of corresponding sampling number.

A, the local PRS frequency-region signal of generation;

B, employing IFFT (Inverse Fast Fourier Transform, inverse Fourier transform fast) transform to time domain with local PRS frequency-region signal;

C, add CP (cyclic prefix, Cyclic Prefix).

3) and receive signal correction, relevant or a plurality of subframes of incoherent merging correlator, obtain the position of maximum correlation, obtain the most powerful path time delay.

4) estimate the time delay in footpath the earliest according to most powerful path, obtain the PRS time of advent of this sub-district.

Because the PRS of single subdistrict obtains through receiving signal and local PRS signal correction the time of advent, so computation complexity is higher.If x (n), y (n) are the finite sequence that N is long, x (n) then, the expression formula that y (n) is relevant is:

$r_{\mathrm{xy}}\left(\mathrm{\τ}\right)=\underset{n=0}{\overset{N-1}{\mathrm{\Σ}}}x(n-\mathrm{\τ})y\left(n\right)=\underset{n=0}{\overset{N-1}{\mathrm{\Σ}}}x\left(n\right)y(n+\mathrm{\τ})---\left(1\right)$

Can use FFT (Fast Fourier Transform, fast Fourier transform) and IFFT to accelerate computing.The IFFT/FFT that is used for fast correlation counts and is N _Corr>=N+N-1, correlation is:

$r_{\mathrm{xy}}\left(k\right)=\mathrm{IFFT}\left(R_{\mathrm{xy}}\left(K\right)\right)=\mathrm{IFFT}(X^{*}\left(K\right)*Y\left(K\right))$

$=\mathrm{IFFT}(\mathrm{FFT}\left(\stackrel{\‾}{x}\left(k\right)\right)*\mathrm{FFT}\left(\stackrel{\‾}{y}\left(k\right)\right))---\left(2\right)$

$\stackrel{\&OverBar;}{x}\left(k\right)=\left\{\begin{array}{cc}x\left(k\right)& 0\&le;k<N\\ 0& N\&le;k<N_{\mathrm{corr}}\end{array}\right.$ $\stackrel{\&OverBar;}{y}\left(k\right)=\left\{\begin{array}{cc}y\left(k\right)& 0\&le;k<N\\ 0& N\&le;k<N_{\mathrm{corr}}\end{array}\right.$

In order to accelerate computing, the points N of common FFT/IFFT _CorrIt is 2 integer power.

Because the PRS subframe is a 1ms, comprises a plurality of PRS symbols in each subframe, when for example the PRS bandwidth was 20M, according to the normal sample rate of 30.72M, the sampled point that obtains in the 1ms was 30720 points, directly used the method for this fast correlation also unrealistic.

Summary of the invention

The embodiment of the invention provides a kind of method and subscriber equipment of location, can reduce the demand of fast correlation to the FFT/IFFT resource.

First aspect provides a kind of method of location, and this method comprises: obtain the quick inverse Fourier transform IFFT of the fast Fourier transform FFT/ points N that location reference signals PRS related operation uses _Corr, this N _CorrFor not with the predetermined value of PRS bandwidth change, and this N _CorrBe less than or equal to 2048; Obtain the IFFT points N that the corresponding orthogonal frequency division multiplex OFDM symbol of PRS bandwidth of sub-district adopts _Ifft-ofdmAt N _Ifft-ofdm>=N _Corr/ 2 o'clock, adopt normal sample rate to receive the PRS receiving sequence in this chance, generate this sub-district not with the local sequence of the PRS of cyclic prefix CP, based on this N _CorrThis is not carried out related operation with the local sequence of the PRS of CP with the PRS receiving sequence that adopts normal sample rate to receive,, observe arriving time difference OTDOA location to obtain the PRS time of advent of this sub-district.

In first kind of possible implementation, in conjunction with first aspect, this method also comprises: at N _Ifft-ofdm<n _Corr/ 2 o'clock, adopt normal sample rate to receive the PRS receiving sequence in this chance, generate the local sequence of PRS of the band CP of this sub-district, based on this N _CorrThe local sequence of the PRS of this band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

In second kind of possible implementation, in conjunction with first aspect, this method also comprises: at N _Ifft-ofdm<n _Corr/ 2 o'clock, adopt over-sampling rate to receive the PRS receiving sequence in this chance, generate the local sequence of PRS of the over-sampling band CP of this sub-district, based on this N _CorrThe local sequence of the PRS of this over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

In the third possible implementation, in conjunction with first kind or second kind of possible implementation of first aspect or first aspect, this N _CorrBe 2048,1024 or 512.

In the 4th kind of possible implementation, in conjunction with the third possible implementation of first aspect or first aspect, based on this N _CorrThis is not carried out related operation with the local sequence of the PRS of CP with the PRS receiving sequence that adopts normal sample rate to receive; Specifically be embodied as: get this not with the i section sequence of the local sequence of the PRS of CP; I is integer and 0≤i≤slice-1, and slice is a number of slices, slice=2N _Ifft-ofdm/ N _Corr, original position is L _{Ind_i}, L _{Ind_i}=L _{Ind_i-1}+ N _Corr/ 2, L _{Ind_0}=0, length is N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K); Get the i section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_i}, Y _{Ind_i}=Y _{Ind_i-1}+ N _Corr/ 2, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K); Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in/2 length are not cut into slices with i of the local sequence of the PRS of CP as this _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1; According to Obtain this not with the local sequence N of the PRS of CP _CorrThe correlation r (n) of/2 length.

In the 5th kind of possible implementation, in conjunction with first kind or the third possible implementation of first aspect, based on this N _CorrThe local sequence of the PRS of this band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive, specifically be embodied as: get the 0th section sequence of the local sequence of PRS of this band CP, original position is zero, and length is N _Ifft-ofdm+ N _Cp, N _CpBe CP length, increase N in the back _Corr-(N _Ifft-ofdm+ N _Cp) long null sequence, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X ₀(K); Get the 0th section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_cp}, Y _{Ind_cp}=Y _{Ind_0}-N _Cp, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y ₀(K); Get IFFT (Conj (X ₀(K)) * Y ₀(K)) preceding N _Corr/ 2 long local sequence N of PRS as this band CP _CorrThe correlation r (n) of/2 length, 0≤n≤N _Corr/ 2-1.

In the 6th kind of possible implementation, in conjunction with second kind or the third possible implementation of first aspect, based on this N _CorrThe local sequence of the PRS of this over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive, specifically be embodied as: get the i section sequence of the local sequence of PRS of this over-sampling band CP, i is integer and 0≤i≤slice _Cp-1, slice _CpBe number of slices,

N _UpsampleBe the over-sampling rate multiple, original position is L _{Ind_cp_i}, L _{Ind_cp_i}=L _{Ind_cp_i-1}+ N _Corr/ 2, L _{Ind_cp_0}=0, at 0≤i≤slice _Cp-2 o'clock, length was got N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is at i=slice _Cp-1 o'clock, length was got N _Upsample(N _Ifft-ofdm+ N _Cp)-(slice _Cp-1) * N _Corr/ 2, increase null sequence in the back, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K); Get the i section sequence of the PRS receiving sequence that adopts the over-sampling rate reception, original position is Y _{Ind_cp_i}, Y _{Ind_cp_i}=Y _{Ind_cp_i-1}+ N _Corr/ 2, Y _{Ind_cp_0}=N _Upsample(Y _{Ind_0}-N _Cp), Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K); Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in i section of/2 local sequences of long PRS as this over-sampling band CP _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1; According to

Obtain the local sequence N of PRS of this over-sampling band CP _CorrThe correlation r (n) of/2 length.

Second aspect provides a kind of subscriber equipment, comprising: acquisition module is used to obtain the quick inverse Fourier transform IFFT of the fast Fourier transform FFT/ points N that location reference signals PRS related operation uses _Corr, this N _CorrFor not with the predetermined value of PRS bandwidth change, and this N _CorrBe less than or equal to 2048, and, the IFFT points N that the corresponding orthogonal frequency division multiplex OFDM symbol of PRS bandwidth of sub-district adopts obtained _Ifft-ofdmReceiver module is used at N _Ifft-ofdm>=N _Corr, adopt normal sample rate to receive the PRS receiving sequence in this chance at/2 o'clock; Processing module is used at N _Ifft-ofdm>=N _Corr/ 2 o'clock, generate this sub-district not with the local sequence of the PRS of cyclic prefix CP, based on this N _CorrThis is not carried out related operation with the local sequence of the PRS of CP with the PRS receiving sequence that adopts normal sample rate to receive,, observe arriving time difference OTDOA location to obtain the PRS time of advent of this sub-district.

In first kind of possible implementation, in conjunction with second aspect, this receiver module also is used at N _Ifft-ofdm<n _Corr, adopt normal sample rate to receive the PRS receiving sequence in this chance at/2 o'clock; This processing module also is used at N _Ifft-ofdm<n _Corr, generate the local sequence of PRS of the band CP of this sub-district, at/2 o'clock based on this N _CorrThe local sequence of the PRS of this band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

In second kind of possible implementation, in conjunction with second aspect, this receiver module also is used at N _Ifft-ofdm<n _Corr, adopt over-sampling rate to receive the PRS receiving sequence in this chance at/2 o'clock; This processing module also is used at N _Ifft-ofdm<n _Corr, generate the local sequence of PRS of the over-sampling band CP of this sub-district, at/2 o'clock based on this N _CorrThe local sequence of the PRS of this over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

In the third possible implementation, in conjunction with first kind or second kind of possible implementation of second aspect or second aspect, this N _CorrBe 2048,1024 or 512.

In the 4th kind of possible implementation, in conjunction with the third possible implementation of second aspect or second aspect, this processing module specifically is used for; Get this not with the i section sequence of the local sequence of the PRS of CP; I is integer and 0≤i≤slice-1, and slice is a number of slices, slice=2N _Ifft-ofdm/ N _Corr, original position is L _{Ind_i}, L _{Ind_i}=L _{Ind_i-1}+ N _Corr/ 2, L _{Ind_0}=0, length is N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K); Get the i section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_i}, Y _{Ind_i}=Y _{Ind_i-1}+ N _Corr/ 2, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K); Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in/2 length are not cut into slices with i of the local sequence of the PRS of CP as this _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1; According to

Obtain this not with the local sequence N of the PRS of CP _CorrThe correlation r (n) of/2 length.

In the 5th kind of possible implementation, in conjunction with first kind or the third possible implementation of second aspect, this processing module specifically is used for, and gets the 0th section sequence of the local sequence of PRS of this band CP, and original position is zero, and length is N _Ifft-ofdm+ N _Cp, N _CpBe CP length, increase N in the back _Corr-(N _Ifft-ofdm+ N _Cp) long null sequence, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X ₀(K); Get the 0th section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_cp}, Y _{Ind_cp}=Y _{Ind_0}-N _Cp, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y ₀(K); Get IFFT (Conj (X ₀(K)) * Y ₀(K)) preceding N _Corr/ 2 long local sequence N of PRS as this band CP _CorrThe correlation r (n) of/2 length, 0≤n≤N _Corr/ 2-1.

In the 6th kind of possible implementation, in conjunction with second kind or the third possible implementation of second aspect, this processing module specifically is used for, and gets the i section sequence of the local sequence of PRS of this over-sampling band CP, and i is integer and 0≤i≤slice _Cp-1, slice _CpBe number of slices,

N _UpsampleBe the over-sampling rate multiple, original position is L _{Ind_cp_i}, L _{Ind_cp_i}=L _{Ind_cp_i-1}+ N _Corr/ 2, L _{Ind_cp_0}=0, at 0≤i≤slice _Cp-2 o'clock, length was got N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is at i=slice _Cp-1 o'clock, length was got N _Upsample(N _Ifft-ofdm+ N _Cp)-(slice _Cp-1) * N _Corr/ 2, increase null sequence in the back, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K); Get the i section sequence of the PRS receiving sequence that adopts the over-sampling rate reception, original position is Y _{Ind_cp_i}, Y _{Ind_cp_i}=Y _{Ind cp i-1}+ N _Corr/ 2, Y _{Ind_cp_0}=N _Upsample(Y _{Ind_0}-N _Cp), Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K); Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in i section of/2 local sequences of long PRS as this over-sampling band CP _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1; According to

Obtain the local sequence N of PRS of this over-sampling band CP _CorrThe correlation r (n) of/2 length.

Based on technique scheme, the method for the location of the embodiment of the invention and subscriber equipment use not the FFT/IFFT points N with the PRS bandwidth change through the PRS related operation _Corr, and N _CorrBe no more than 2048, can reduce the demand of fast correlation the FFT/IFFT resource.

Description of drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the invention; To do to introduce simply to the accompanying drawing of required use in the embodiment of the invention below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the indicative flowchart according to the method for the location of the embodiment of the invention.

Fig. 2 is another indicative flowchart according to the method for the location of the embodiment of the invention.

Fig. 3 is the indicative flowchart again according to the method for the location of the embodiment of the invention.

Fig. 4 is the schematic block diagram according to the subscriber equipment of the embodiment of the invention.

Fig. 5 is the schematic block diagram of subscriber equipment according to another embodiment of the present invention.

Embodiment

To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work should belong to the scope that the present invention protects.

Should understand; The technical scheme of the embodiment of the invention can be applied to various employing OFDM (Orthogonal Frequency Division Multiplex; OFDM) communication system that positions of reference signal; For example: Long Term Evolution (Long Term Evolution abbreviates " LTE " as) system, LTE FDD (Frequency Division Duplex abbreviates " FDD " as) system, LTE time division duplex (Time Division Duplex; Abbreviate " TDD " as), global interconnected inserting of microwave (Worldwide Interoperability for Microwave Access abbreviates " WiMAX " as) communication system etc.

Should also be understood that in embodiments of the present invention subscriber equipment (User Equipment; Abbreviate " UE " as) can communicate through wireless access network (Radio Access Network abbreviates " RAN " as) and one or more core net, for example; Subscriber equipment can be mobile phone, computer etc.; For example, subscriber equipment can also be portable, pocket, hand-hold type, built-in computer or vehicle-mounted wireless transmitter, they and wireless access network switched voice and/or data.

Signal refers to baseband digital signal in the embodiment of the invention; Therefore after signal is sampled through certain sample rate, show as discrete sequence on the mathematical form, if the length of this sequence is the length of a symbol; Be also referred to as symbol; Length like infructescence is the length of a sub-frame, is also referred to as subframe, and the like.

Fig. 1 shows the indicative flowchart according to the method 100 of the location of the embodiment of the invention.This method 100 is carried out by subscriber equipment, and as shown in Figure 1, this method 100 comprises:

S110 obtains the quick inverse Fourier transform IFFT of the fast Fourier transform FFT/ points N that location reference signals PRS related operation uses _Corr, this N _CorrFor not with the predetermined value of PRS bandwidth change, and this N _CorrBe less than or equal to 2048;

S120 obtains the IFFT points N that the corresponding OFDM symbol of PRS bandwidth of sub-district adopts _Ifft-ofdm

S130 is at N _Ifft-ofdm>=N _Corr/ 2 o'clock, adopt normal sample rate to receive the PRS receiving sequence in this chance, generate this sub-district not with the local sequence of the PRS of cyclic prefix CP, based on this N _CorrThis is not carried out related operation with the local sequence of the PRS of CP with the PRS receiving sequence that adopts normal sample rate to receive,, observe arriving time difference OTDOA location to obtain the PRS time of advent of this sub-district.

In the OTDOA location, the PRS of single subdistrict obtains through receiving signal and local PRS signal correction the time of advent, and related operation uses FFT and IFFT to accelerate computing.Owing to comprise a plurality of PRS symbols in each subframe of PRS, directly use the method for fast correlation also unrealistic.Therefore need respectively each OFDM symbol in the subframe to be correlated with.The relevant correlation that merges in each OFDM symbol obtains the correlation in the whole subframe.

The PRS symbol adopts IFFT to realize the OFDM modulation.The PRS bandwidth respectively corresponding different IFFT points N different according to agreement _Ifft-ofdm, counting like the corresponding respectively IFFT of 1.4/3/5/10/15/20M system bandwidth is 128/256/512/1024/2048/2048.But for the anti-multipath expansion, each OFDM symbol front need increase CP, and length is N _Cp, a symbol lengths that has then increased CP does not just satisfy 2 integer power.

In order to realize that receives the relevant of a PRS symbol and a local PRS symbol, for local sequence not with the situation of CP, N _Corr=2N _Ifft-ofdm, once can obtain N _Ifft-ofdmThe correlation of point.1.4/3/5/10/15/20M it is 256/512/1024/2048/2048/4096 that the FFT/IFFT that uses during system bandwidth is corresponding relevant respectively counts, promptly can satisfy is 2 integral number power.And for the situation of local sequence band CP, for satisfying N _Corr>=(N _Ifft-ofdm+ N _Cp)+(N _Ifft-ofdm+ N _CpN is worked as in)-1 _Corr=4N _Ifft-ofdmThe time, once can obtain N _Corr-(N _Ifft-ofdm+ N _Cp) correlation of point, it is 512/1024/2048/2048/4096/8192 that the FFT/IFFT that uses in corresponding relevant respectively for the 1.4/3/5/10/15/20M system bandwidth counts, just can satisfy is 2 integral number power.

Because the complexity that realizes is determined that by the bandwidth of maximum therefore the relevant maximum resource that needs of local sequence band CP is 8192 an IFFT/FFT resource.Local sequence is not 4096 an IFFT/FFT resource with the relevant maximum resource that needs of CP.And the corresponding local ofdm signal of PRS in order to produce different bandwidth own, needing maximum IFFT to count is 2048 points.Therefore, directly adopt fast correlation algorithm can cause the IFFT resource to increase.

In embodiments of the present invention, in order to reduce the demand of fast correlation, the FFT/IFFT points N to the FFT/IFFT resource _CorrEmploying be less than or equal to 2048 not with the predetermined value of PRS bandwidth change.That is to say,, adopt identical N for different PRS band width configuration _Corr, and N _CorrThe maximum IFFT that being no more than the generation of OFDM symbol needs counts 2048.And subscriber equipment judges whether to be with CP relevant according to the size of sub-district PRS bandwidth.Subscriber equipment obtains the IFFT points N that the corresponding OFDM symbol of PRS bandwidth of sub-district adopts according to the PRS bandwidth of sub-district _Ifft-ofdm, because N _CorrAdopt not predetermined value, thereby can pass through N with the PRS bandwidth change _Ifft-ofdmAnd N _CorrMagnitude relationship determine whether to be with CP relevant.At N _Ifft-ofdm>=N _Corr/ 2 o'clock, sub-district PRS bandwidth was bigger, and subscriber equipment adopts normal sample rate (like the nyquist sampling rate) to receive the PRS receiving sequence in this chance.Adopt normal sample rate promptly not adopt over-sampling rate, for example, for 20M and 15M bandwidth sample rate with 30.72M; The 10M bandwidth is with the sample rate of 15.36M, and the 5M bandwidth is with the sample rate of 7.68M, and the 3M bandwidth is with the sample rate of 3.84M; 1.4M bandwidth with the sample rate of 1.92M, has 30720 points respectively, 15360 points in the subframe of a corresponding 1ms; 7680 points, 3840 points, 1920 point samplings point.Subscriber equipment generate this sub-district not with the local sequence of the PRS of CP, then based on this N _CorrThis is not carried out related operation with the local sequence of the PRS of CP with the PRS receiving sequence that adopts normal sample rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.Because the FFT/IFFT points N that related operation uses _CorrFor being no more than 2048 predetermined value, therefore reduced the high request of fast correlation to the FFT/IFFT specification.

Therefore, the method for the location of the embodiment of the invention is used not the FFT/IFFT points N with the PRS bandwidth change through the PRS related operation _Corr, and N _CorrBe no more than 2048, can reduce the demand of fast correlation the FFT/IFFT resource.

In embodiments of the present invention, N _CorrPreferred 2048,1024 or 512.Correspondingly, local sequence section length N _Corr/ 2 preferred value is 1024,512 or 256.Because the IFFT/FFT that the IFFT/FFT operation efficiency of small point is counted more greatly is lower, therefore, if from operation efficiency, N _CorrThe=2048th, the optimal value under the prerequisite that does not increase the IFFT resource is still considered the requirement of internal memory, N _Corr=1024, or N _Corr=512 can more save internal memory.

In S130, subscriber equipment is at N _Ifft-ofdm>=N _Corr/ 2 o'clock, adopt normal sample rate to receive the PRS receiving sequence in this chance, generate this sub-district not with the local sequence of the PRS of CP, based on this N _CorrThis is not carried out related operation with the local sequence of the PRS of CP with the PRS receiving sequence that adopts normal sample rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

At N _Ifft-ofdm>=N _Corr/ 2 o'clock, sub-district PRS bandwidth was bigger, does not adopt the over-sampling pattern, adopts normal sampling configuration, and subscriber equipment adopts normal sample rate to receive the PRS receiving sequence in this chance.Because sub-district PRS bandwidth is bigger, adopt and not to be with the CP pattern, what subscriber equipment generated this sub-district does not carry out related operation with local sequence of the PRS of CP and receiving sequence.Subscriber equipment is according to the PRS information of this sub-district in the OTDOA positioning auxiliary information of base station transmission; Produce one by one in the corresponding subframe; Local PRS frequency-region signal on the corresponding bandwidth adopts the IFFT conversion that local PRS frequency-region signal is transformed to time domain then, does not add CP; Obtain this sub-district not with the local sequence of the PRS of CP, wherein IFFT counts and is N _Ifft-ofdm, promptly local sequence length is N _Ifft-ofdmThen, subscriber equipment is based on this N _CorrThis is not carried out related operation with the local sequence of the PRS of CP with the PRS receiving sequence that adopts normal sample rate to receive, obtain correlation, thereby obtain the PRS time of advent of this sub-district, to carry out the OTDOA location.Alternatively, based on this N _CorrThis is not carried out related operation with the local sequence of the PRS of CP with the PRS receiving sequence that adopts normal sample rate to receive, comprising:

Get this not with the i section sequence of the local sequence of the PRS of CP, i is integer and 0≤i≤slice-1, and slice is a number of slices, slice=2N _Ifft-ofdm/ N _Corr, original position is L _{Ind_i}, L _{Ind_i}=L _{Ind_i-1}+ N _Corr/ 2, L _{Ind_0}=0, length is N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K);

Get the i section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_i}, Y _{Ind_i}=Y _{Ind_i-1}+ N _Corr/ 2, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K);

Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in/2 length are not cut into slices with i of the local sequence of the PRS of CP as this _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1;

According to

Obtain this not with the local sequence N of the PRS of CP _CorrThe correlation r (n) of/2 length.

Particularly, for normal sampling, be not with the CP pattern, number of slices slice=2N _Ifft-ofdm/ N _CorrAt N _Ifft-ofdm>=N _Corr/ 2 o'clock, minimum number of slices was 1.In order to obtain local sequence N _CorrThe correlation r (n) of/2 length needs to obtain the N in each local sequence section _CorrThe correlation r of/2 length _i(n), corresponding then addition, promptly

N in each local sequence section _CorrThe correlation r of/2 length _i(n) preparation method is:

1) get the i section sequence of local sequence, original position is L _{Ind_i}, length is N _Corr/ 2, back N _Corr/ 2 sequences are zero, constitute N _CorrLong local sequence FFT input, wherein L _{Ind_i}Initial value L _{Ind_0}Be 0, expression begins to get from first data of this symbol, and local sequence start position update mode is: L _{Ind_i}=L _{Ind_i-1}+ N _Corr/ 2.

2) with N _CorrLong local sequence FFT input is carried out the FFT conversion and is obtained X _i(K).

3) get the corresponding i section sequence of receiving sequence, original position is Y _{Ind_i}, the length of getting is N _Corr, constitute N _CorrLong receiving sequence FFT input, wherein Y _{Ind_i}Initial value is Y _{Ind_0}, receiving sequence original position update mode is: Y _{Ind_i}=Y _{Ind_i-1}+ N _Corr/ 2.

4) with N _CorrLong receiving sequence FFT input is carried out the FFT conversion and is obtained Y _i(K).

5) Conj (X _i(K) dot product Y _i(K) or Y _i(K) dot product Conj (X _i(K), obtain N _CorrLong IFFT input.

6) IFFT (Conj (X _i(K)) * Y _iOr IFFT (Y (K)) _i(K) * Conj (X _i(K))), obtain N _CorrLong IFFT output.

7) get preceding N _Corr/ 2 as r _i(n).

Obtaining all r _i(n) after, according to

Obtain whole local sequence N _CorrThe correlation r (n) of/2 length.

In embodiments of the present invention, as shown in Figure 2, alternatively, this method 100 also comprises:

S140 is at N _Ifft-ofdm<n _Corr/ 2 o'clock, adopt normal sample rate to receive the PRS receiving sequence in this chance, generate the local sequence of PRS of the band CP of this sub-district, based on this N _CorrThe local sequence of the PRS of this band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

At N _Ifft-ofdm<n _Corr/ 2 o'clock, sub-district PRS bandwidth was less, and the sub-carrier number that contains the PRS signal is less, can increase the sample points of participating in computing because band CP is correlated with, and improved the correlation properties of signal, and therefore, be correlated with CP and can guarantee certain performance this moment.Therefore, at N _Ifft-ofdm<n _Corr/ 2 o'clock, can adopt normal sampling, band CP pattern, promptly subscriber equipment adopts normal sample rate to receive the PRS receiving sequence in this chance, and the local sequence of PRS and the receiving sequence that generate the band CP of this sub-district are carried out related operation.Subscriber equipment is according to the PRS information of this sub-district in the OTDOA positioning auxiliary information of base station transmission; Produce one by one in the corresponding subframe; Local PRS frequency-region signal on the corresponding bandwidth adopts the IFFT conversion that local PRS frequency-region signal is transformed to time domain then, and wherein IFFT counts and is N _Ifft-ofdm, add CP, obtain the local sequence of PRS of the band CP of this sub-district, be about to the last N of ofdm symbol _CpThe data of length are replicated in ofdm symbol head, and formation length is N _Ifft-ofdm+ N _CpSymbol.Then, subscriber equipment is based on this N _CorrThe local sequence of the PRS of this band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive, obtain correlation, thereby obtain the PRS time of advent of this sub-district, to carry out the OTDOA location.Alternatively, based on this N _CorrThe local sequence of the PRS of this band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive, comprising:

Get the 0th section sequence of the local sequence of PRS of this band CP, original position is zero, and length is N _Ifft-ofdm+ N _Cp, N _CpBe CP length, increase N in the back _Corr-(N _Ifft-ofdm+ N _Cp) long null sequence, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X ₀(K);

Get the 0th section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_cp}, Y _{Ind_cp}=Y _{Ind_0}-N _Cp, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y ₀(K);

Get IFFT (Conj (X ₀(K)) * Y ₀(K)) preceding N _Corr/ 2 long local sequence N of PRS as this band CP _CorrThe correlation r (n) of/2 length, 0≤n≤N _Corr/ 2-1.

Particularly, at N _Ifft-ofdm<n _Corr/ 2 o'clock, the not enough N of local sequence length _Corr/ 2, therefore for normal sampling, band CP pattern, number of slices is 1.Obtain local sequence N _CorrThe method of the correlation r (n) of/2 length is:

1) get the 0th section sequence of local sequence, original position is zero, and length is N _Ifft-ofdm+ N _Cp, back N _Corr-(N _Ifft-ofdm+ N _Cp) sequence is zero, constitutes N _CorrLong local sequence FFT input.

2) with N _CorrLong local sequence FFT input is carried out the FFT conversion and is obtained X ₀(K).

3) get the 0th section corresponding sequence of receiving sequence, original position is Y _{Ind_cp}, Y _{Ind_cp}=Y _{Ind_0}-N _Cp, the length of getting is N _Corr, Y _{Ind_0}Receiving sequence original position initial value does not constitute N when not being with CP for normal sampling _CorrLong receiving sequence FFT input.

4) with N _CorrLong receiving sequence FFT input is carried out the FFT conversion and is obtained Y ₀(K).

5) Conj (X ₀(K)) dot product Y ₀(K) or Y ₀(K) dot product Conj (X ₀(K)), obtain N _CorrLong IFFT input.

6) IFFT (Conj (X ₀(K)) * Y ₀Or IFFT (Y (K)) ₀(K) * Conj (X ₀(K))), obtain N _CorrLong IFFT output.

7) get preceding N _Corr/ 2 as r (n).

Therefore, the method for the location of the embodiment of the invention is used not the FFT/IFFT points N with the PRS bandwidth change through the PRS related operation _Corr, and N _CorrBe no more than 2048, can reduce the demand of fast correlation the FFT/IFFT resource; And when little bandwidth, the local sequence of PRS and the receiving sequence that generate band CP are carried out related operation, can under the prerequisite that does not increase the IFFT specification, promote positioning performance under the little bandwidth.

When little bandwidth, in order to strengthen little bandwidth characteristic, can adopt the over-sampling pattern, therefore as shown in Figure 3 in embodiments of the present invention, alternatively, this method 100 also comprises:

S150 is at N _Ifft-ofdm<n _Corr/ 2 o'clock, adopt over-sampling rate to receive the PRS receiving sequence in this chance, generate the local sequence of PRS of the over-sampling band CP of this sub-district, based on this N _CorrThe local sequence of the PRS of this over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

At N _Ifft-ofdm<n _Corr/ 2 o'clock, sub-district PRS bandwidth was less, adopted the over-sampling pattern can strengthen positioning performance under the little bandwidth.Over-sampling rate N _UpsampleCan be pre-configured, for example, the 3M bandwidth adopts 2 times of over-sampling rates, and the 1.4M bandwidth adopts 4 times of over-sampling rates.Therefore, at N _Ifft-ofdm<n _Corr/ 2 o'clock, can adopt over-sampling, band CP pattern, promptly subscriber equipment adopts over-sampling rate to receive the PRS receiving sequence in this chance, and the local sequence of PRS and the receiving sequence that generate the over-sampling band CP of this sub-district are carried out related operation.Subscriber equipment produces in the corresponding subframe according to the PRS information of this sub-district in the OTDOA positioning auxiliary information of base station transmission one by one, and the local PRS frequency-region signal on the corresponding bandwidth increases (N then in frequency-region signal _Upsample-1) N _Ifft-ofdmPoint zero carries out N _Upsample* N _Ifft-ofdmPoint IFFT, and add CP, the length of CP is N _Upsample* N _Cp, obtaining the local sequence of PRS of the over-sampling band CP of this sub-district, length is N _Upsample(N _Ifft-ofdm+ N _Cp).Then, subscriber equipment is based on this N _CorrThe local sequence of the PRS of this over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive, obtain correlation, thereby obtain the PRS time of advent of this sub-district, to carry out the OTDOA location.Alternatively, based on this N _CorrThe local sequence of the PRS of this over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive, comprising:

Get the i section sequence of the local sequence of PRS of this over-sampling band CP, i is integer and 0≤i≤slice _Cp-1, slice _CpBe number of slices,

N _UpsampleBe the over-sampling rate multiple, original position is L _{Ind_cp_i}, L _{Ind_cp_i}=L _{Ind_cp_i-1}+ N _Corr/ 2, L _{Ind_cp_0}=0, at 0≤i≤slice _Cp-2 o'clock, length was got N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is at i=slice _Cp-1 o'clock, length was got N _Upsample(N _Ifft-ofdm+ N _Cp)-(slice _Cp-1) * N _Corr/ 2, increase null sequence in the back, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K);

Get the i section sequence of the PRS receiving sequence that adopts the over-sampling rate reception, original position is Y _{Ind_cp_i}, Y _{Ind_cp_i}=Y _{Ind_cp_i-1}+ N _Corr/ 2, Y _{Ind_cp_0}=N _Upsample(Y _{Ind_0}-N _Cp), Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K);

Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in i section of/2 local sequences of long PRS as this over-sampling band CP _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1;

According to

Obtain the local sequence N of PRS of this over-sampling band CP _CorrThe correlation r (n) of/2 length.

Particularly; For over-sampling; Band CP pattern; Number of slices wherein,

expression round up.Be not necessarily single section in this case, promptly number of slices is more than or equal to 1.In order to obtain local sequence N _CorrThe correlation r (n) of/2 length needs to obtain the N in each local sequence section _CorrThe correlation r of/2 length _i(n), corresponding then addition, promptly

N in each local sequence section _CorrThe correlation r of/2 length _i(n) preparation method is:

1) get the i section sequence of local sequence, original position is L _{Ind_cp_i}, length is N _Corr/ 2, back N _Corr/ 2 sequences are zero, constitute N _CorrLong local sequence FFT input, wherein L _{Ind_cp_i}Initial value L _{Ind_cp_0}Be 0, expression begins to get from first data of this symbol, and local sequence start position update mode is: L _{Ind_cp_i}=L _{Ind_cp_i-1}+ N _Corr/ 2.Owing to possibly there be the not enough N of local sequence length in last section _Corr/ 2, in this case, get remaining length, promptly at i=slice _Cp-1 o'clock, length was got N _Upsample(N _Ifft-ofdm+ N _Cp)-(slice _Cp-1) * N _Corr/ 2, getting of other is zero, constitutes N _CorrLong local sequence FFT input.

2) with N _CorrLong local sequence FFT input is carried out the FFT conversion and is obtained X _i(K).

3) get the corresponding i section sequence of receiving sequence, original position is Y _{Ind_cp_i}, the length of getting is N _Corr, constitute N _CorrLong receiving sequence FFT input, wherein Y _{Ind_cp_i}Initial value is Y _{Ind_cp_0}=N _Upsample(Y _{Ind_0}-N _Cp), Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, receiving sequence original position update mode is: Y _{Ind_cp_i}=Y _{Ind_cp_i-1}+ N _Corr/ 2.

4) with N _CorrLong receiving sequence FFT input is carried out the FFT conversion and is obtained Y _i(K).

5) Conj (X _i(K) dot product Y _i(K) or Y _i(K) dot product Conj (X _i(K), obtain N _CorrLong IFFT input.

6) IFFT (Conj (X _i(K)) * Y _iOr IFFT (Y (K)) _i(K) * Conj (X _i(K))), obtain N _CorrLong IFFT output.

7) get preceding N _Corr/ 2 as r _i(n).

Obtaining all r _i(n) after, according to

Obtain whole local sequence N _CorrThe correlation r (n) of/2 length.

Therefore, the method for the location of the embodiment of the invention is used not the FFT/IFFT points N with the PRS bandwidth change through the PRS related operation _Corr, and N _CorrBe no more than 2048, can reduce the demand of fast correlation the FFT/IFFT resource; And when little bandwidth, the local sequence of PRS and the receiving sequence that generate over-sampling band CP are carried out related operation, can under the prerequisite that does not increase the IFFT specification, strengthen positioning performance under the little bandwidth.

Combine Fig. 1 to Fig. 3 in the preceding text, describe method in detail, will combine Fig. 4 and Fig. 5 below, describe subscriber equipment according to the embodiment of the invention according to the location of the embodiment of the invention.

Fig. 4 shows the schematic block diagram according to the subscriber equipment 400 of the embodiment of the invention.As shown in Figure 4, this subscriber equipment 400 comprises:

Acquisition module 410 is used to obtain the quick inverse Fourier transform IFFT of the fast Fourier transform FFT/ points N that location reference signals PRS related operation uses _Corr, this N _CorrFor not with the predetermined value of PRS bandwidth change, and this N _CorrBe less than or equal to 2048, and, the IFFT points N that the corresponding orthogonal frequency division multiplex OFDM symbol of PRS bandwidth of sub-district adopts obtained _Ifft-ofdm

Receiver module 420 is used at N _Ifft-ofdm>=N _Corr, adopt normal sample rate to receive the PRS receiving sequence in this chance at/2 o'clock;

Processing module 430 is used at N _Ifft-ofdm>=N _Corr/ 2 o'clock, generate this sub-district not with the local sequence of the PRS of cyclic prefix CP, based on this N _CorrThis is not carried out related operation with the local sequence of the PRS of CP with the PRS receiving sequence that adopts normal sample rate to receive,, observe arriving time difference OTDOA location to obtain the PRS time of advent of this sub-district.

The subscriber equipment of the embodiment of the invention uses not the FFT/IFFT points N with the PRS bandwidth change through the PRS related operation _Corr, and N _CorrBe no more than 2048, can reduce the demand of fast correlation the FFT/IFFT resource.

In embodiments of the present invention, alternatively, this receiver module 420 also is used at N _Ifft-ofdm<n _Corr, adopt normal sample rate to receive the PRS receiving sequence in this chance at/2 o'clock;

This processing module 430 also is used at N _Ifft-ofdm<n _Corr, generate the local sequence of PRS of the band CP of this sub-district, at/2 o'clock based on this N _CorrThe local sequence of the PRS of this band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

The subscriber equipment of the embodiment of the invention uses not the FFT/IFFT points N with the PRS bandwidth change through the PRS related operation _Corr, and N _CorrBe no more than 2048, can reduce the demand of fast correlation the FFT/IFFT resource; And when little bandwidth, the local sequence of PRS and the receiving sequence that generate band CP are carried out related operation, can under the prerequisite that does not increase the IFFT specification, promote positioning performance under the little bandwidth.

In embodiments of the present invention, alternatively, this receiver module 420 also is used at N _Ifft-ofdm<n _Corr, adopt over-sampling rate to receive the PRS receiving sequence in this chance at/2 o'clock;

This processing module 430 also is used at N _Ifft-ofdm<n _Corr, generate the local sequence of PRS of the over-sampling band CP of this sub-district, at/2 o'clock based on this N _CorrThe local sequence of the PRS of this over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

The subscriber equipment of the embodiment of the invention uses not the FFT/IFFT points N with the PRS bandwidth change through the PRS related operation _Corr, and N _CorrBe no more than 2048, can reduce the demand of fast correlation the FFT/IFFT resource; And when little bandwidth, the local sequence of PRS and the receiving sequence that generate over-sampling band CP are carried out related operation, can under the prerequisite that does not increase the IFFT specification, strengthen positioning performance under the little bandwidth.

In embodiments of the present invention, alternatively, this N _CorrBe 2048,1024 or 512.

In embodiments of the present invention, alternatively, this processing module 430 specifically is used for, and gets this not with the i section sequence of the local sequence of the PRS of CP, and i is integer and 0≤i≤slice-1, and slice is a number of slices, slice=2N _Ifft-ofdm/ N _Corr, original position is L _{Ind_i}, L _{Ind_i}=L _{Ind_i-1}+ N _Corr/ 2, L _{Ind_0}=0, length is N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K); Get the i section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_i}, Y _{Ind_i}=Y _{Ind_i-1}+ N _Corr/ 2, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K); Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in/2 length are not cut into slices with i of the local sequence of the PRS of CP as this _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1; According to

Obtain this not with the local sequence N of the PRS of CP _CorrThe correlation r (n) of/2 length.

In embodiments of the present invention, alternatively, this processing module 430 specifically is used for, and gets the 0th section sequence of the local sequence of PRS of this band CP, and original position is zero, and length is N _Ifft-ofdm+ N _Cp, N _CpBe CP length, increase N in the back _Corr-(N _Ifft-ofdm+ N _Cp) long null sequence, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X ₀(K); Get the 0th section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_cp}, Y _{Ind_cp}=Y _{Ind_0}-N _Cp, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y ₀(K); Get IFFT (Conj (X ₀(K)) * Y ₀(K)) preceding N _Corr/ 2 long local sequence N of PRS as this band CP _CorrThe correlation r (n) of/2 length, 0≤n≤N _Corr/ 2-1.

In embodiments of the present invention, alternatively, this processing module 430 specifically is used for, and gets the i section sequence of the local sequence of PRS of this over-sampling band CP, and i is integer and 0≤i≤slice _Cp-1, slice _CpBe number of slices,

N _UpsampleBe the over-sampling rate multiple, original position is L _{Ind_cp_i}, L _{Ind_cp_i}=L _{Ind_cp_i-1}+ N _Corr/ 2, L _{Ind_cp_0}=0, at 0≤i≤slice _Cp-2 o'clock, length was got N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is at i=slice _Cp-1 o'clock, length was got N _Upsample(N _Ifft-ofdm+ N _Cp)-(slice _Cp-1) * N _Corr/ 2, increase null sequence in the back, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K); Get the i section sequence of the PRS receiving sequence that adopts the over-sampling rate reception, original position is Y _{Ind_cp_i}, Y _{Ind_cp_i}=Y _{Ind_cp_i-1}+ N _Corr/ 2, Y _{Ind_cp_0}=N _Upsample(Y _{Ind_0}-N _Cp), Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K); Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in i section of/2 local sequences of long PRS as this over-sampling band CP _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1; According to

Obtain the local sequence N of PRS of this over-sampling band CP _CorrThe correlation r (n) of/2 length.

Can be corresponding to according to the subscriber equipment in the method for the location of the embodiment of the invention according to the subscriber equipment 400 of the embodiment of the invention; And above-mentioned and other operation of each module in the subscriber equipment 400 and/or function are respectively in order to realize the corresponding flow process of each method among Fig. 1 to Fig. 3; For succinctly, repeat no more at this.

The subscriber equipment of the embodiment of the invention uses not the FFT/IFFT points N with the PRS bandwidth change through the PRS related operation _Corr, and N _CorrBe no more than 2048, can reduce the demand of fast correlation the FFT/IFFT resource.

Fig. 5 shows the schematic block diagram of subscriber equipment 500 according to another embodiment of the present invention.As shown in Figure 5, this subscriber equipment 500 comprises:

Processor 510 is used to obtain the quick inverse Fourier transform IFFT of the fast Fourier transform FFT/ points N that location reference signals PRS related operation uses _Corr, this N _CorrFor not with the predetermined value of PRS bandwidth change, and this N _CorrBe less than or equal to 2048, and, the IFFT points N that the corresponding orthogonal frequency division multiplex OFDM symbol of PRS bandwidth of sub-district adopts obtained _Ifft-ofdm

Receiver 520 is used at N _Ifft-ofdm>=N _Corr, adopt normal sample rate to receive the PRS receiving sequence in this chance at/2 o'clock;

This processor 510 also is used at N _Ifft-ofdm>=N _Corr/ 2 o'clock, generate this sub-district not with the local sequence of the PRS of cyclic prefix CP, based on this N _CorrThis is not carried out related operation with the local sequence of the PRS of CP with the PRS receiving sequence that adopts normal sample rate to receive,, observe arriving time difference OTDOA location to obtain the PRS time of advent of this sub-district.

The subscriber equipment of the embodiment of the invention uses not the FFT/IFFT points N with the PRS bandwidth change through the PRS related operation _Corr, and N _CorrBe no more than 2048, can reduce the demand of fast correlation the FFT/IFFT resource.

Alternatively, this receiver 520 also is used at N _Ifft-ofdm<n _Corr, adopt normal sample rate to receive the PRS receiving sequence in this chance at/2 o'clock;

This processor 510 also is used at N _Ifft-ofdm<n _Corr, generate the local sequence of PRS of the band CP of this sub-district, at/2 o'clock based on this N _CorrThe local sequence of the PRS of this band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

Alternatively, this receiver 520 also is used at N _Ifft-ofdm<n _Corr, adopt over-sampling rate to receive the PRS receiving sequence in this chance at/2 o'clock;

This processor 510 also is used at N _Ifft-ofdm<n _Corr, generate the local sequence of PRS of the over-sampling band CP of this sub-district, at/2 o'clock based on this N _CorrThe local sequence of the PRS of this over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of this sub-district.

Alternatively, this N _CorrBe 2048,1024 or 512.

Alternatively, this processor 510 specifically is used for, and gets this not with the i section sequence of the local sequence of the PRS of CP, and i is integer and 0≤i≤slice-1, and slice is a number of slices, slice=2N _Ifft-ofdm/ N _Corr, original position is L _{Ind_i}, L _{Ind_i}=L _{Ind_i-1}+ N _Corr/ 2, L _{Ind_0}=0, length is N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K); Get the i section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_i}, Y _{Ind_i}=Y _{Ind_i-1}+ N _Corr/ 2, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K); Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in/2 length are not cut into slices with i of the local sequence of the PRS of CP as this _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1; According to

Obtain this not with the local sequence N of the PRS of CP _CorrThe correlation r (n) of/2 length.

Alternatively, this processor 510 specifically is used for, and gets the 0th section sequence of the local sequence of PRS of this band CP, and original position is zero, and length is N _Ifft-ofdm+ N _Cp, N _CpBe CP length, increase N in the back _Corr-(N _Ifft-ofdm+ N _Cp) long null sequence, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X ₀(K); Get the 0th section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_cp}, Y _{Ind_cp}=Y _{Ind_0}-N _Cp, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y ₀(K); Get IFFT (Conj (X ₀(K)) * Y ₀(K)) preceding N _Corr/ 2 long local sequence N of PRS as this band CP _CorrThe correlation r (n) of/2 length, 0≤n≤N _Corr/ 2-1.

Alternatively, this processor 510 specifically is used for, and gets the i section sequence of the local sequence of PRS of this over-sampling band CP, and i is integer and 0≤i≤slice _Cp-1, slice _CpBe number of slices,

N _UpsampleBe the over-sampling rate multiple, original position is L _{Ind_cp_i}, L _{Ind_cp_i}=L _{Ind_cp_i-1}+ N _Corr/ 2, L _{Ind_cp_0}=0, at 0≤i≤slice _Cp-2 o'clock, length was got N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is at i=slice _Cp-1 o'clock, length was got N _Upsample(N _Ifft-ofdm+ N _Cp)-(slice _Cp-1) * N _Corr/ 2, increase null sequence in the back, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K); Get the i section sequence of the PRS receiving sequence that adopts the over-sampling rate reception, original position is Y _{Ind_cp_i}, Y _{Ind_cp_i}=Y _{Ind_cp_i-1}+ N _Corr/ 2, Y _{Ind_cp_0}=N _Upsample(Y _{Ind_0}-N _Cp), Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K); Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in i section of/2 local sequences of long PRS as this over-sampling band CP _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1; According to

Obtain the local sequence N of PRS of this over-sampling band CP _CorrThe correlation r (n) of/2 length.

Can be corresponding to according to the subscriber equipment in the method for the location of the embodiment of the invention according to the subscriber equipment 500 of the embodiment of the invention; And above-mentioned and other operation of each module in the subscriber equipment 500 and/or function are respectively in order to realize the corresponding flow process of each method among Fig. 1 to Fig. 3; For succinctly, repeat no more at this.

Should be understood that in embodiments of the present invention, term " and/or " only be a kind of incidence relation of describing affiliated partner, can there be three kinds of relations in expression.For example, A and/or B, can represent: individualism A exists A and B, these three kinds of situation of individualism B simultaneously.In addition, character "/" among this paper, generally represent forward-backward correlation to as if a kind of " or " relation.

Those of ordinary skills can recognize; The unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein; Can realize with electronic hardware, computer software or the combination of the two; For the interchangeability of hardware and software clearly is described, the composition and the step of each example described prevailingly according to function in above-mentioned explanation.These functions still are that software mode is carried out with hardware actually, depend on the application-specific and the design constraint of technical scheme.The professional and technical personnel can use distinct methods to realize described function to each certain applications, but this realization should not thought and exceeds scope of the present invention.

The those skilled in the art can be well understood to, for the convenience described with succinct, the concrete course of work of the system of foregoing description, device and unit can repeat no more at this with reference to the corresponding process among the preceding method embodiment.

In several embodiment that the application provided, should be understood that the system that is disclosed, apparatus and method can realize through other mode.For example, device embodiment described above only is schematically, for example; The division of said unit; Only be that a kind of logic function is divided, during actual the realization other dividing mode can be arranged, for example a plurality of unit or assembly can combine or can be integrated into another system; Or some characteristics can ignore, or do not carry out.In addition, the coupling each other that shows or discuss or directly coupling or communication to connect can be that INDIRECT COUPLING or communication through some interfaces, device or unit connects, also can be electric, machinery or other form connect.

Said unit as separating component explanation can or can not be physically to separate also, and the parts that show as the unit can be or can not be physical locations also, promptly can be positioned at a place, perhaps also can be distributed on a plurality of NEs.Can realize the purpose of embodiment of the invention scheme according to the needs selection some or all of unit wherein of reality.

In addition, each functional unit in each embodiment of the present invention can be integrated in the processing unit, also can be that the independent physics in each unit exists, and also can be that two or more unit are integrated in the unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, also can adopt the form of SFU software functional unit to realize.

If said integrated unit is realized with the form of SFU software functional unit and during as independently production marketing or use, can be stored in the computer read/write memory medium.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words; Perhaps all or part of of this technical scheme can come out with the embodied of software product, and this computer software product is stored in the storage medium, comprises that some instructions are with so that a computer equipment (can be a personal computer; Server, the perhaps network equipment etc.) carry out all or part of step of the said method of each embodiment of the present invention.And aforesaid storage medium comprises: various media that can be program code stored such as USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD.

The above; Be merely embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technical staff who is familiar with the present technique field can expect the modification or the replacement of various equivalences easily in the technical scope that the present invention discloses, these modifications or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (14)

1. the method for a location is characterized in that, comprising:

Obtain the quick inverse Fourier transform IFFT of the fast Fourier transform FFT/ points N that location reference signals PRS related operation uses _Corr, said N _CorrFor not with the predetermined value of PRS bandwidth change, and said N _CorrBe less than or equal to 2048;

Obtain the IFFT points N that the corresponding orthogonal frequency division multiplex OFDM symbol of PRS bandwidth of sub-district adopts _Ifft-ofdm

At N _Ifft-ofdm>=N _Corr/ 2 o'clock, adopt normal sample rate to receive the PRS receiving sequence in this chance, generate said sub-district not with the local sequence of the PRS of cyclic prefix CP, based on said N _CorrDo not carry out related operation with the PRS receiving sequence that adopts normal sample rate to receive with said,, observe arriving time difference OTDOA location to obtain the PRS time of advent of said sub-district with the local sequence of the PRS of CP.

2. method according to claim 1 is characterized in that, said method also comprises:

At N _Ifft-ofdm<n _Corr/ 2 o'clock, adopt normal sample rate to receive the PRS receiving sequence in this chance, generate the local sequence of PRS of the band CP of said sub-district, based on said N _CorrThe local sequence of the PRS of said band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of said sub-district.

3. method according to claim 1 is characterized in that, said method also comprises:

At N _Ifft-ofdm<n _Corr/ 2 o'clock, adopt over-sampling rate to receive the PRS receiving sequence in this chance, generate the local sequence of PRS of the over-sampling band CP of said sub-district, based on said N _CorrThe local sequence of the PRS of said over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of said sub-district.

4. according to each described method in the claim 1 to 3, it is characterized in that said N _CorrBe 2048,1024 or 512.

5. according to claim 1 or 4 described methods, it is characterized in that, said based on said N _CorrDo not carry out related operation with the PRS receiving sequence that adopts normal sample rate to receive with said, comprising with the local sequence of the PRS of CP:

Get that said i is integer and 0≤i≤slice-1 not with the i section sequence of the local sequence of the PRS of CP, slice is a number of slices, slice=2N _Ifft-ofdm/ N _Corr, original position is L _{Ind_i}, L _{Ind_i}=L _{Ind_i-1}+ N _Corr/ 2, L _{Ind_0}=0, length is N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K);

Get the i section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_i}, Y _{Ind_i}=Y _{Ind_i-1}+ N _Corr/ 2, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K);

Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _Corr/ 2 grow as said with the N in i section of the local sequence of the PRS of CP _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1;

According to Obtain said not with the local sequence N of the PRS of CP _CorrThe correlation r (n) of/2 length.

6. according to claim 2 or 4 described methods, it is characterized in that, said based on said N _CorrThe local sequence of the PRS of said band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive, comprising:

Get the 0th section sequence of the local sequence of PRS of said band CP, original position is zero, and length is N _Ifft-ofdm+ N _Cp, N _CpBe CP length, increase N in the back _Corr-(N _Ifft-ofdm+ N _Cp) long null sequence, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X ₀(K);

Get the 0th section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_cp}, Y _{Ind_cp}=Y _{Ind_0}-N _Cp, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y ₀(K);

Get IFFT (Conj (X ₀(K)) * Y ₀(K)) preceding N _CorrThe local sequence N of/2 long PRS as said band CP _CorrThe correlation r (n) of/2 length, 0≤n≤N _Corr/ 2-1.

7. according to claim 3 or 4 described methods, it is characterized in that, said based on said N _CorrThe local sequence of the PRS of said over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive, comprising:

Get the i section sequence of the local sequence of PRS of said over-sampling band CP, i is integer and 0≤i≤slice _Cp-1, slice _CpBe number of slices,

N _UpsampleBe the over-sampling rate multiple, original position is L _{Ind_cp_i}, L _{Ind_cp_i}=L _{Ind_cp_i-1}+ N _Corr/ 2, L _{Ind_cp_0}=0, at 0≤i≤slice _Cp-2 o'clock, length was got N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is at i=slice _Cp-1 o'clock, length was got N _Upsample(N _Ifft-ofdm+ N _Cp)-(slice _Cp-1) * N _Corr/ 2, increase null sequence in the back, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K);

Get the i section sequence of the PRS receiving sequence that adopts the over-sampling rate reception, original position is Y _{Ind_cp_i}, Y _{Ind_cp_i}=Y _{Ind_cp_i-1}+ N _Corr/ 2, Y _{Ind_cp_0}=N _Upsample(Y _{Ind_0}-N _Cp), Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K);

Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in i section of/2 local sequences of long PRS as said over-sampling band CP _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1;

According to Obtain the local sequence N of PRS of said over-sampling band CP _CorrThe correlation r (n) of/2 length.

8. a subscriber equipment is characterized in that, comprising:

Acquisition module is used to obtain the quick inverse Fourier transform IFFT of the fast Fourier transform FFT/ points N that location reference signals PRS related operation uses _Corr, said N _CorrFor not with the predetermined value of PRS bandwidth change, and said N _CorrBe less than or equal to 2048, and, the IFFT points N that the corresponding orthogonal frequency division multiplex OFDM symbol of PRS bandwidth of sub-district adopts obtained _Ifft-ofdm

Receiver module is used at N _Ifft-ofdm>=N _Corr, adopt normal sample rate to receive the PRS receiving sequence in this chance at/2 o'clock;

Processing module is used at N _Ifft-ofdm>=N _Corr/ 2 o'clock, generate said sub-district not with the local sequence of the PRS of cyclic prefix CP, based on said N _CorrDo not carry out related operation with the PRS receiving sequence that adopts normal sample rate to receive with said,, observe arriving time difference OTDOA location to obtain the PRS time of advent of said sub-district with the local sequence of the PRS of CP.

9. subscriber equipment according to claim 8 is characterized in that said receiver module also is used at N _Ifft-ofdm<n _Corr, adopt normal sample rate to receive the PRS receiving sequence in this chance at/2 o'clock;

Said processing module also is used at N _Ifft-ofdm<n _Corr, generate the local sequence of PRS of the band CP of said sub-district, at/2 o'clock based on said N _CorrThe local sequence of the PRS of said band CP is carried out related operation with the PRS receiving sequence that adopts normal sample rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of said sub-district.

10. subscriber equipment according to claim 8 is characterized in that said receiver module also is used at N _Ifft-ofdm<n _Corr, adopt over-sampling rate to receive the PRS receiving sequence in this chance at/2 o'clock;

Said processing module also is used at N _Ifft-ofdm<n _Corr, generate the local sequence of PRS of the over-sampling band CP of said sub-district, at/2 o'clock based on said N _CorrThe local sequence of the PRS of said over-sampling band CP is carried out related operation with the PRS receiving sequence that adopts over-sampling rate to receive,, carry out the OTDOA location to obtain the PRS time of advent of said sub-district.

11. each described subscriber equipment in 10 is characterized in that said N according to Claim 8 _CorrBe 2048,1024 or 512.

12. according to Claim 8 or 11 described subscriber equipmenies, it is characterized in that said processing module specifically is used for, get that said i is integer and 0≤i≤slice-1 not with the i section sequence of the local sequence of PRS of CP, slice is a number of slices, slice=2N _Ifft-ofdm/ N _Corr, original position is L _{Ind_i}, L _{Ind_i}=L _{Ind_i-1}+ N _Corr/2, L _{Ind_0}=0, length is N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K); Get the i section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_i}, Y _{Ind_i}=Y _{Ind_i-1}+ N _Corr/ 2, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K); Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _Corr/ 2 grow as said with the N in i section of the local sequence of the PRS of CP _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1; According to

Obtain said not with the local sequence N of the PRS of CP _CorrThe correlation r (n) of/2 length.

13., it is characterized in that said processing module specifically is used for according to claim 9 or 11 described subscriber equipmenies, get the 0th section sequence of the local sequence of PRS of said band CP, original position is zero, length is N _Ifft-ofdm+ N _Cp, N _CpBe CP length, increase N in the back _Corr-(N _Ifft-ofdm+ N _Cp) long null sequence, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X ₀(K); Get the 0th section sequence of the PRS receiving sequence that adopts normal sample rate reception, original position is Y _{Ind_cp}, Y _{Ind_cp}=Y _{Ind_0}-N _Cp, Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y ₀(K); Get IFFT (Conj (X ₀(K)) * Y ₀(K)) preceding N _CorrThe local sequence N of/2 long PRS as said band CP _CorrThe correlation r (n) of/2 length, 0≤n≤N _Corr/ 2-1.

14., it is characterized in that said processing module specifically is used for according to claim 10 or 11 described subscriber equipmenies, get the i section sequence of the local sequence of PRS of said over-sampling band CP, i is integer and 0≤i≤slice _Cp-1, slice _CpBe number of slices,

N _UpsampleBe the over-sampling rate multiple, original position is L _{Ind_cp_i}, L _{Ind_cp_i}=L _{Ind_cp_i-1}+ N _Corr/ 2, L _{Ind_cp_0}=0, at 0≤i≤slice _Cp-2 o'clock, length was got N _Corr/ 2, increase N in the back _CorrThe null sequence of/2 length constitutes N _CorrLong local sequence is at i=slice _Cp-1 o'clock, length was got N _Upsample(N _Ifft-ofdm+ N _Cp)-(slice _Cp-1) * N _Corr/ 2, increase null sequence in the back, constitute N _CorrLong local sequence is with N _CorrLong local sequence is carried out the FFT conversion and is obtained X _i(K); Get the i section sequence of the PRS receiving sequence that adopts the over-sampling rate reception, original position is Y _{Ind_cp_i}, Y _{Ind_cp_i}=Y _{Ind_cp_i-1}+ N _Corr/ 2, Y _{Ind_cp_0}=N _Upsample(Y _{Ind_0}-N _Cp), Y _{Ind_0}Receiving sequence original position initial value when not being with CP for normal sampling, length is N _Corr, constitute N _CorrLong receiving sequence is with N _CorrLong receiving sequence is carried out the FFT conversion and is obtained Y _i(K); Get IFFT (Conj (X _i(K)) * Y _i(K)) preceding N _CorrN in i section of/2 local sequences of long PRS as said over-sampling band CP _CorrThe correlation r of/2 length _i(n), 0≤n≤N _Corr/ 2-1; According to Obtain the local sequence N of PRS of said over-sampling band CP _CorrThe correlation r (n) of/2 length.

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