CN101958727B - Relative method and device for downlink pilot time slot search - Google Patents

Abstract

The invention discloses a relative method and device for downlink pilot time slot search, a segment correlation is utilized for overcoming relative algorithm invalidation or performance degradation caused by large frequency shift, overcoming uplink interference from adjacent user by executing the energy normalization to relative values, overcoming the fading of a wireless signal channel by softly combining a plurality of frames and reducing the realization cost of a system by packet storage and combination.

Description

Correlation technique and device for downlink pilot frequency time slot search

Technical field

The present invention relates to TD SDMA (TD-SCDMA) system, relate more specifically to segmentation correlation technique and the device based on packet combining in TD-SCDMA system, for descending pilot frequency time slot (DwPTS), searched for.

Background technology

In TD-SCDMA system, when subscriber equipment (UE) is started shooting for the first time, its top priority is to obtain the carrier wave of suitable cell, timing and code information.Realizing regularly with a kind of effective means of code synchronisation is that to carry out descending pilot frequency time slot relevant.

The frame format of TD-SCDMA system is described below with reference to Figure 1A and Figure 1B.Figure 1A shows the physical frame formats of TD-SCDMA, and Figure 1B shows the form of a descending pilot frequency time slot in TD-SCDMA subframe.

From Figure 1A, the signal transmission cycle is 5ms.A signal frame comprises two subframes (for example, frame i comprises subframe 1 and 2), and wherein, a subframe comprises 6400 chips (chip).For example, and each subframe (, subframe 1) is divided into again seven normal time slot TS0-TS6 and three special time slot: DwPTS, GP (protection time slot) and UpPTS (uplink pilot time slot).Seven normal time slots have comprised all uplink and downlink time slots, and the position of uplink and downlink time slot and number can flexible configuration.

As shown in Figure 1B, the time span of special time slot DwPTS is 75 μ s, is equivalent to 96 chips, comprises the protection interval GAP of 32 chips and the descending synchronous code SYNC_DL of 64 chips.TD-SCDMA system has defined altogether 32 kinds of descending synchronous code SYNC_DL, and stipulates that each community only used wherein unique a kind of.

In view of above feature, in TD-SCDMA system, one of typical practice of Cell searching is: utilize known descending synchronous code SYNC_DL in 6400 chips (period of sub-frame) scope, to carry out relevant to reception data, according to the peak value finding and position judgment community thereof, whether exist, and acquisition with base station thick the synchronizeing on time and code channel.

On mathematics, traditional related algorithm is described below.Supposing to receive signal indication is r _n, wherein n represents to receive the chip number of signal, n=0, and 1,2 ... ∞; 32 kinds of SYNC_DL code tables are shown to S _{i, j}, wherein i represents the code Taoist monastic name of SYNC_DL code, i=0, and 1,2 ... 31; J represents the chip number in each SYNC_DL code, because the length of SYNC_DL code is 64 chips, thus j=0,1,2 ... 63.The general related operation for a subframe is shown below:

$y_{i,k}=\underset{m=0}{\overset{63}{\mathrm{\Σ}}}(r_{k+m}\×{S^{*}}_{i,m}),i=\mathrm{0,1,2},...31,k=\mathrm{0,1,2},...6399---\left(1\right)$

Wherein, k is relevant initial chip position.Afterwards can basis | y _{i, k}| ²value carry out peakedness ratio and judgement.

But there is following problem in traditional descending pilot frequency time slot correlation technique.

First, because airborne wireless signal exists fade-out, in order to realize comparatively desirable performance, relevant length can not only limit to a period of sub-frame, and needs a plurality of period of sub-frame; And the result in each cycle need to be merged.So, for a Candidate key, at least needing to preserve all related operation results in one-period, its number is 6400.Therefore owing to need to 32 kinds of SYNC_DL being attempted in the starting stage, total memory space is 6400 * 32 correlated results, system to realize cost very large.

Secondly, its precision and stability of crystal oscillator that subscriber equipment uses is conventionally poor, makes to receive the frequency deviation that in signal, existence is larger (this frequency deviation maximum can reach +/-15PPM left and right).So large frequency deviation has had a strong impact on relevant performance, makes the correlation peak after computing be difficult to occur.

In addition,, because TD-SCDMA is time division duplex (TDD) system, up-downgoing channel is used identical frequency, therefore, subscriber equipment is being searched the net stage, and the signal that cannot distinguish reception is the down link signal from base station, the uplink signal that still closes on user and sent out.Due to square being inversely proportional to of the energy attenuation of wireless signal and distance, so its dynamic range of aerial signal that subscriber equipment receives is very large, generally in tens dB left and right.For example, referring to Fig. 2, if this user UE1 from base station node B away from, and now just from it, the position close to has other user UE2 to converse very much.The transmission time slot of supposing UE2 is TS3, and in the signal that UE1 receives, the signal strength signal intensity of TS3 time slot is by the signal strength signal intensity being far longer than from the DwPTS time slot of base station.In this case, traditional correlation technique performance will be subject to very large impact.

Summary of the invention

In order to address the above problem, the present invention proposes a kind of descending pilot frequency time slot correlation technique of novelty, it adopts segmentation to be correlated with to overcome related algorithm inefficacy or the hydraulic performance decline that large frequency deviation causes, correlation is carried out to the uplink interference that energy normalized overcomes proximal subscribers, adopt the soft merging of multiframe to overcome the decline of wireless channel, and adopt packet memory and merge the cost that realizes that reduces system.

According to one aspect of the invention, a kind of relevant apparatus for downlink pilot frequency time slot search is provided, it is relevant that it is configured to minute two stages execution, and described relevant apparatus comprises: correlator, for the subframe receiving is carried out relevant to the descending synchronous code of each code channel, energy normalized device, for carrying out energy normalized and export each relevant normalization data each correlated results of exporting from described correlator, maximum-value selector, for selecting and export the relevant normalization data of the mould value maximum in predetermined packet of packets length from the described relevant normalization data of described energy normalized device output in the first stage, memory, for press the relevant normalization data of the mould value maximum in predetermined packet of packets described in each of code channel storage subframe in the described first stage, and in second stage may code channel storage subframe for each screening in the described first stage to the divide into groups relevant normalization data of corresponding grouped data of the maximum of each described possibility code channel, alternative device, for select the packet number of the relevant normalization data of mould value maximum and the residing maximum grouping of the relevant normalization data of described mould value maximum from described memory by code channel in the described first stage, and by comparing, the relevant normalization data of exporting described mould value maximum is greater than the code Taoist monastic name of code channel and the packet number of corresponding maximum grouping of predetermined threshold, and by each, may from described memory, select the position of the relevant normalization data of mould value maximum and the corresponding maximum chip of relevant normalization data of described mould value maximum by code channel in described second stage, and by comparing, the relevant normalization data of exporting described mould value maximum is greater than the code Taoist monastic name of code channel of described predetermined threshold and the position of corresponding maximum chip, and controller, for in the described first stage, described correlator being controlled as receiving successively complete subframe, and in described second stage, described correlator is controlled as for each described may code channel reception and the maximum of each possibility code channel corresponding grouped data of dividing into groups.Preferably, correlator is Piecewise Correlator.

According to a further aspect of the present invention, provide a kind of correlation technique for downlink pilot frequency time slot search, it comprises first stage and second stage.First stage comprises: receive one or more subframes; The subframe receiving is carried out relevant and exported each correlated results to the descending synchronous code of each code channel successively; Described each correlated results is carried out to energy normalized to export relevant normalization data; For each described code channel, the relevant normalization data of the internal mold value maximum of respectively dividing into groups is also exported in minute group selection; For each described code channel, the relevant normalization data correspondence of the described mould value maximum of the respective packets of described one or more subframes is added up and stored; And the packet number of selecting the relevant normalization data of stored mould value maximum and the residing maximum grouping of the relevant normalization data of described mould value maximum by code channel, and by comparing, the relevant normalization data of exporting described mould value maximum is greater than the code Taoist monastic name of code channel and the packet number of corresponding maximum grouping of predetermined threshold.Second stage comprises: receive one or more subframes; For each the possibility code channel filtering out in the described first stage, by carrying out relevantly to each described divide into groups descending synchronous code of corresponding grouped data and corresponding possible code channel of maximum that may code channel in the subframe receiving, and each correlated results is carried out to energy normalized to export relevant normalization data; For each described possibility code channel, the relevant normalization data of one or more subframes that described second stage is received adds up and stores by chip is corresponding; And the position of selecting the relevant normalization data of stored mould value maximum and the corresponding maximum chip of relevant normalization data of this mould value maximum by code channel, and by relatively, the relevant normalization data of the described mould value maximum of output second stage is greater than the code Taoist monastic name of code channel of predetermined threshold and the position of corresponding maximum chip.

Accompanying drawing explanation

Reading in conjunction with the drawings following detailed description will more intactly understand the present invention, in the accompanying drawings:

Figure 1A shows the physical frame formats of TD-SCDMA;

Figure 1B shows the form of a DwPTS time slot in TD-SCDMA subframe;

Fig. 2 is the schematic diagram that a kind of situation of proximal subscribers uplink interference is shown;

Fig. 3 is the brief block diagram that the configuration of TD-SCDMA wireless communication system is shown;

Fig. 4 is the brief block diagram that the concrete structure of subscriber equipment shown in Fig. 3 is shown;

Fig. 5 is the block diagram illustrating according to an embodiment of the invention for the relevant apparatus of downlink pilot frequency time slot search;

Fig. 6 is the block diagram that the ios dhcp sample configuration IOS DHCP of the controller in the relevant apparatus shown in Fig. 5 is shown; And

Fig. 7 is the flow chart illustrating according to an embodiment of the invention for the processing procedure of the correlation technique of downlink pilot frequency time slot search.

Embodiment

Referring now to accompanying drawing, in conjunction with the preferred embodiments of the present invention, the present invention is described.But it will be understood by those skilled in the art that the present invention is not limited to these preferred embodiments, but cover the alternative body be included in the spirit and scope of the present invention that claims limit, revise body and/or equivalent.In the following description, many details have been set forth so that thorough understanding of the present invention to be provided.But, it will be understood by those skilled in the art that in the situation that do not have some or all in these details also can implement the present invention.In other cases, for fear of unnecessarily fuzzy the present invention, and do not describe known mechanism in detail.

Here, it should be noted that similar label is indicated similar part in each width figure.Here each width figure also describing illustrated in is used to illustrate each feature of the present invention.With regard to special characteristic, in a width figure, be illustrated and but do not have with regard to situation about being illustrated in another width figure, except as otherwise noted or structure forbid being inherently incorporated to this feature, should be understood to those features and can be suitable for being included in the embodiment that other accompanying drawing presents, just look like they in those accompanying drawings by intactly diagram is the same.Except as otherwise noted, accompanying drawing is uninevitable proportional.Any yardstick that accompanying drawing provides is not intended scope of the present invention to limit, and is only schematic.

Fig. 3 shows the brief block diagram of TD-SCDMA wireless communication system.As shown in Figure 3, this wireless communication system mainly comprises core net 302, wireless access network 304 and subscriber equipment 306.Core net 302 is main process audio call, data connection and exchange, customer position information management, network characteristic and Service control, signaling and user profile transmission mechanism in wireless communication system and with being connected and route etc. of other network.Wireless access network 304 provides the connection of subscriber equipment and core net, and the management of responsible Radio Resource and allotment, comprises base station and radio network controller two category nodes.Subscriber equipment 306 can be for example that mobile phone, personal digital assistant (PDA) or other have the Portable data processing equipment of the function communicating in TD-SCDMA wireless communication system.

Fig. 4 shows the brief block diagram of the concrete structure of subscriber equipment shown in Fig. 3.As shown in Figure 4, this subscriber equipment mainly comprises: radio-frequency module 401, AGC module 402, forming filter 403, synchronization module 404, channel estimation module 405, multipath tracking module 406, activates detection module 407, joint-detection module 408, frequency deviation estimating modules 409, ANR/SNR measurement module 410, demapping (demapping) module 411 and decoder module 412.401 pairs of analog signals that receive of radio-frequency module unload ripple and analog-to-digital conversion is processed, and so that the analog signal being received is transformed to baseband digital signal, are input to subordinate.402 pairs of signals of AGC module carry out automatic gain control.Forming filter 403, root raised cosine filter (SRRC) carries out pulse shaping to baseband digital signal.Synchronization module 404 is for making subscriber equipment get thick synchronous etc. on time of community and code channel.Channel estimation module 405 carries out the channel estimating of a plurality of communities for the midamble code sequence in the signal after pulse shaping.Multipath tracking module 406 is utilized channel estimation results, determines optimum sampling point, and carries out the multipath window position tracking of each community.Activate detection module 407 and activate detection and code channel activating detection for carrying out window.408 pairs of joint-detection modules are aliasing in the data of each code channel together and carry out certain calculating, obtain the transmission symbol on each code channel.Frequency deviation estimating modules 409 is utilized the skew of joint detection results estimated frequency.ANR/SNR measurement module 410 utilizes joint detection results to carry out amplitude and noise ratio (ANR) and signal to noise ratio (SNR) is measured.Demapping module 411 is that soft bit is delivered to decoder module by the symbol transition of joint-detection module output.412 pairs of soft bit result that demapping module is exported of decoder module are decoded, and obtain information bit.

The present invention relates generally to adopting the improvement of the synchronization module of descending pilot frequency time slot correlation technique.Should be noted that, although provided TD-SCDMA wireless communication system as shown in Figure 3 and Figure 4 and the ios dhcp sample configuration IOS DHCP of subscriber equipment above, but can recognize, can use therein communication system of the present invention and subscriber equipment to be not limited to this concrete example, but can be suitable for adopting descending pilot frequency time slot correlation technique to carry out signal synchronous various systems and equipment.

The problem having in order to solve traditional descending pilot frequency time slot correlation technique, inventor has proposed a kind of descending pilot frequency time slot correlation technique of novelty, it adopts segmentation relevant (partial correlation) to overcome related algorithm inefficacy or hydraulic performance decline that large frequency deviation causes, correlation is carried out to the uplink interference that energy normalized overcomes proximal subscribers, adopt the soft merging of multiframe to overcome the decline of wireless channel, and adopt packet memory and merge the cost that realizes that reduces system, for example the memory space of system reduces to 200 * 32 correlations by 6400 * 32 correlations.In reality realizes, descending pilot frequency time slot correlation technique of the present invention comprises two stages, the mode that the first stage adopts grouping to preserve and merge, but relevant range is very large, comprises whole length of each subframe; Second stage adopts the mode of preserving and merging by chip, but relevant range is smaller, only includes a bit of length (block length+left and right boundary belt) in each subframe.

Below with reference to Fig. 5, the relevant apparatus 500 for downlink pilot frequency time slot search is described according to an embodiment of the invention.As shown in Figure 5, the relevant apparatus 500 for downlink pilot frequency time slot search comprises opening/closing device 501, correlator 502, energy normalized device 503, switch 504, maximum-value selector 505, accumulator 506, controller 507, memory 508 and alternative device 509.

Opening/closing device 501 replaces the path that opening and closing data enter correlator under the control of controller 507 (describing after a while).

Correlator 502 carries out relevant to 32 corresponding various SYNC_DL codes of code channel by the data that receive successively.Correlator 502 is controlled as and in the first stage, complete subframe and SYNC_DL code is carried out relevantly, and the data of maximal correlation normalized value grouping of living in that may code channel by each screening in the first stage in second stage (hereinafter referred to as maximum grouping) are carried out relevant to the SYNC_DL code of corresponding code channel.According to an example, preferably adopt Piecewise Correlator as correlator 502, the related algorithm inefficacy or the hydraulic performance decline that to overcome large frequency deviation, cause.As mentioned above, supposing to receive signal indication is r _n, n=0 wherein, 1,2 ... ∞; 32 kinds of SYNC_DL code tables are shown to S _{i, j}, i=0 wherein, 1,2 ... 31, j=0,1,2 ... 63.In the first stage, the segmentation of a sub-frame data is relevant can be expressed as:

$y_{i,k}=\underset{j=0}{\overset{3}{\mathrm{\Σ}}}\left({\left|\underset{m=0}{\overset{15}{\mathrm{\Σ}}}(r_{j\×16+k+m}\×{S^{*}}_{i,j\×16+m})\right|}^2\right)---\left(2\right)$

Wherein, the code Taoist monastic name that i is SYNC_DL (i=0,1,2 ... 31); K for relevant initial chip position (k=0,1,2 ... 6399).From formula (2), for each subframe, correlator 502 will be for 6400 correlated results of each code channel output.In the segmentation related operation shown in formula (2), for each (i, k) combination, that is, for the related operation each time of a subframe and each SYNC_DL code, be all divided into 4 sections and carry out.Particularly, for example, 0 (at relevant initial chip position, be, k=0), and with code Taoist monastic name 0 (be, when SYNC_DL code i=0) (hereinafter referred to as 0 yard of SYNC_DL) is correlated with, the 0-15 chip that receives signal is carried out relevant to the 0-15 chip of 0 yard of SYNC_DL, the 16-31 chip that receives signal is carried out relevant to the 16-31 chip of 0 yard of SYNC_DL, the 32-47 chip that receives signal is carried out relevant to the 32-47 chip of 0 yard of SYNC_DL, and the 48-63 chip that receives signal is carried out relevant to the 48-63 chip of 0 yard of SYNC_DL, and the value that each section of related operation obtained summation obtains correlated results y _0,0.Should understand, this is only an example but not limitation of the present invention, and those skilled in the art can adopt the related operation of more or less segmentation under different application occasion.

It should be noted that in second stage, in order to prevent that multipath from losing, correlator 502 can to each may code channel the maximum corresponding grouped data of dividing into groups add that left and right boundary belt (for example, each 16 chips of left and right) carries out relevant.

503 pairs of each correlated results of exporting from correlator 502 of energy normalized device carry out energy normalized.In the first stage, energy normalized can be expressed as:

$y_{i,k}=\frac{\underset{j=0}{\overset{3}{\mathrm{\Σ}}}\left({\left|\underset{m=0}{\overset{15}{\mathrm{\Σ}}}(r_{j\×16+k+m}\×{S^{*}}_{i,j\×16+m})\right|}^2\right)}{\underset{m=0}{\overset{63}{\mathrm{\Σ}}}{\left|r_{k+m}\right|}^2}---\left(3\right)$

From formula (3), energy normalized device 503 has the function of the energy that calculates signal energy by chip and obtain by correlation length (being 64 chips) accumulation calculating from initial chip k here, and the function that the energy accumulation value of the segmentation correlated results of corresponding chip and this chip is divided by.

Switch 504 is for switching the outgoing route of energy normalized device 503 under the control controller 507 (describing after a while).Particularly, switch 504 is switched to maximum-value selector 505 (will describe after a while) in the first stage by the outgoing route of energy normalized device 503, and in second stage, the outgoing route of energy normalized device 503 is switched to accumulator 506 (will describe after a while), thereby between first stage and second stage the relevant normalization data of differentiated treatment.

Maximum-value selector 505 is preserved for the grouping of first stage, and it selects and export that relevant normalization data of the mould value maximum in each grouping under the control of controller 507 from the relevant normalization data of energy normalized device 503 outputs.Particularly, maximum-value selector 505 receives and preserves the relevant normalization data from energy normalized device 503 one by one, a new data of each reception, maximum-value selector 505 just compares this new data mould value and the peaked mould value of previously preserving, if this new data mould value is greater than institute's save value, institute's save value is updated to this new data, otherwise does not deal with.Under the control of controller 507, maximum-value selector 505 is just exported the maximum of preserving every a block length, and save value is reset to zero, to restart the maximum selection rule of next grouping.The output of maximum-value selector 505 can be expressed as:

$y_{i,l}=$

$\left\{\frac{\underset{j=0}{\overset{3}{\mathrm{\Σ}}}\left({\left|\underset{m=0}{\overset{15}{\mathrm{\Σ}}}(r_{j\×16+l\×32+k_{\max }+m}\×{S^{*}}_{i,j\×16+m})\right|}^2\right)}{\underset{m=0}{\overset{63}{\mathrm{\Σ}}}{\left|r_{l\×32+k_{\max }+m}\right|}^2}\right|k_{\max }=\underset{k}{\arg \max }\left\{{\left|\frac{\underset{j=0}{\overset{3}{\mathrm{\Σ}}}\left(\right|{\underset{m=0}{\overset{15}{\mathrm{\Σ}}}(r_{j\×16+l\×32+k+m}\×{S^{*}}_{i,j\×16+m})|}^2)}{\underset{m=0}{\overset{63}{\mathrm{\Σ}}}{\left|r_{l\×32+k+m}\right|}^2}\right|}^2\right\}---\left(4\right)$

Wherein, i be descending synchronous code SYNC_DL code Taoist monastic name (i=0,1,2 ... 31); L is packet number, and in this example, each subframe is divided into 200 groupings, that is, l=0,1,2 ... 199, thereby block length is 32 chips; K for the relevant original position in each grouping (200 grouping in the situation that, k=0,1,2 ... 31).

Accumulator 506 is for merging the value of current reception and the analog value that is stored in memory 508 (will describe after a while).Particularly, in the first stage, accumulator 506 adds up the corresponding data of the last subframe of storage the relevant normalization data of the mould value maximum of each grouping from maximum-value selector 505 outputs and memory 508 export this accumulated value; And in second stage, accumulator 506, for the possible code channel filtering out in the first stage, adds up the corresponding data of last subframe each the relevant normalization data from 503 outputs of energy normalized device and memory 508 export accumulated value.For the first stage, for example, in the situation that carry out the soft information of 4 frames and merge, the output of accumulator 506 can be expressed as:

$y_{i,l,\mathrm{combined}}=$

$\underset{n=0}{\overset{3}{\mathrm{\Σ}}}\left\{\frac{\underset{j=0}{\overset{3}{\mathrm{\Σ}}}\left({\left|\underset{m=0}{\overset{15}{\mathrm{\Σ}}}(r_{n\×6400+j\×16+l\×32+k_{\max }+m}\×{S^{*}}_{i,j\×16+m})\right|}^2\right)}{\underset{m=0}{\overset{63}{\mathrm{\Σ}}}{\left|r_{n\×6400+l\×32+k_{\max }+m}\right|}^2}\right|k_{\max }=\underset{k}{\arg \max }\left\{{\left|\frac{\underset{j=0}{\overset{3}{\mathrm{\Σ}}}\left(\right|{\underset{m=0}{\overset{15}{\mathrm{\Σ}}}(r_{n\×6400+j\×16+l\×32+k+m}\×{S^{*}}_{i,j\×16+m})|}^2)}{\underset{m=0}{\overset{63}{\mathrm{\Σ}}}{\left|r_{n\×6400+l\×32+k+m}\right|}^2}\right|}^2\right\}---\left(5\right)$

Wherein, the implication of i, l and k is identical with formula (4).And for second stage; because carrying out among a small circle (block length+left and right boundary belt), current 502 of correlators are correlated with to find accurate positional information (; the initial chip position of SYNC_DL code); therefore accumulator 506 is not the method that adopts packet combining; but press, chip pointwise is corresponding to be merged; now, accumulator 506 is output as:

$y_{i,k,\mathrm{combined}}=\underset{n=0}{\overset{3}{\mathrm{\Σ}}}\left\{\frac{\underset{j=0}{\overset{3}{\mathrm{\Σ}}}\left({\left|\underset{m=0}{\overset{15}{\mathrm{\Σ}}}(r_{n\×6400+j\×16+p_i\×32+k+m}\×{S^{*}}_{i,j\×16+m})\right|}^2\right)}{\underset{m=0}{\overset{63}{\mathrm{\Σ}}}{\left|r_{n\×6400+p_i\×32+k+m}\right|}^2}\right\}---\left(6\right)$

Wherein, i ∈ [0..31], k=-15 ,-14 ...-1,0,1,2 ... 31 ... 47.In the example shown in formula (6), the grouping left and right filtering out has been added respectively the boundary belt of 16 chips.It will be understood by those skilled in the art that this is only an example but not limitation of the present invention.In other example, boundary belt also can have more or less chip.It is also understood that, the frame number that soft information merges is not limited to 4 frames, and can by controller 507 (will describe in detail after a while), be configured to different numbers according to different application occasion.

Controller 507 for controlling the on/off operation of opening/closing device 501, the selection length of the stage handover operation of switch 504, maximum-value selector 505 (that is, block length), reading the addressing of memory 508 and 509 pairs of memories 508 of alternative device.Below with reference to Fig. 6, describe the configuration of controller 507 in detail, as shown in Figure 6, controller 507 can comprise that the initial/final position control section 5071 of being correlated with, grouping switching control part 5072, stage switching control part 5073 and memory read control section 5074.

Initial/final position the control section 5071 of being correlated with is controlled the on/off operation of opening/closing devices 501, is controlled at the relevant initial sum final position in each period of sub-frame.Particularly, relevant initial/final position control section 5071 is made as respectively 0 and 6399 in the first stage by the relevant initial sum final position of correlator 502 (that is, make correlator 502 complete subframe is relevant to SYNC_DL code); And second stage based on the comparison selector 509 in the output of first stage, the relevant initial sum final position of correlator 502 is made as respectively to i * 32-16 and (i+1) * 32+15, wherein, i is the packet number of the maximum grouping that each that filter out the first stage may code channel.

Grouping switching control part 5072 is controlled maximum-value selector 505 so that maximum-value selector 505 is just exported the maximum of preserving and save value is reset to zero every block length (selection length), goes back control storage 508 to be addressed to the respective memory locations of memory 508 simultaneously.According to an example, grouping switching control part 5072 can be counter.

Stage switching control part 5073 can be controlled the frame number that soft information merges, it is the frame number moving the first stage, and after judging that for example related operation, the grouping of 4 frames were preserved and merged and completed the first stage, to switch 504 output switching signals so that the outgoing route of energy normalized device 503 is directly switch into accumulator 506.

Memory read control section 5074 related operation, the grouping of judgement first stage preserve and merge completed after or at the related operation of judgement second stage with after merging and having completed, trigger data in alternative device 509 beginning read memories 508 to compare selection.

Turn back to Fig. 5, memory 508 in the first stage, by code channel, store each subframe each grouping mould value maximum relevant normalization data (for example, store 200 * 32 relevant normalization datas), and for each screening in the first stage, may store the relevant normalization data of the corresponding maximum grouping of each possibility code channel by code channel in second stage.It should be noted that, before starting the processing of first stage, memory 508 is initialized to zero, and after the processing that completes the first stage, memory 508 is reset to zero to be recycled and reused for second stage.According to an example, for example, in the first stage, memory 508 can be added to the relevant position in memory 508 by the Output rusults of maximum-value selector 505 under the control of controller 507.In this case, memory 508 has the function of accumulator 506, thereby can omit accumulator 506.

In the first stage, alternative device 509 is selected the relevant normalization data v of mould value maximum from memory 508 by code channel _iand obtain the residing packet number p of these data _i:

v _i＝max{|y _{i，l，combined}| ²}

$p_i=\underset{l}{\arg \max }\left\{{\left|y_{i,l,\mathrm{combined}}\right|}^2\right\}$

Wherein, i=0,1,2 ... 31, l=0,1,2 ... 199, and pass through the relevant normalization data v of the mould value maximum of each code channel _icompare with predetermined threshold, relevant normalization data to controller 507 (particularly, relevant initial/final position control section 5071) output mould value maximum is greater than the code Taoist monastic name of code channel of this predetermined threshold and the packet number of the maximum grouping of corresponding code channel.In second stage, alternative device 509 by code channel from memory 508 select the relevant normalization data of mould value maximum and obtain these data the position of corresponding chip (hereinafter referred to as maximum chip), and by the relevant normalization data of the mould value maximum of each code channel is compared with predetermined threshold, the relevant normalization data of output mould value maximum is greater than the position of the code Taoist monastic name of code channel and the maximum chip of corresponding code channel of this predetermined threshold.

Below with reference to Fig. 7, the correlation technique for downlink pilot frequency time slot search is described according to an embodiment of the invention.Fig. 7 is the flow chart of processing procedure that the correlation technique for downlink pilot frequency time slot search of the present embodiment is shown.As shown in the figure, after processing starts, first memory 508 is initialized to zero, and correlator 502 controller 507 relevant initial/stop receiving a complete subframe (step S701) under the control of control section 5071, and received subframe is relevant to export 32 * 6400 correlated results (step S702) to 32 corresponding each SYNC_DL codes of code channel successively.

According to an example, what in step S702, carry out is that segmentation is relevant, for example, for each relevant initial chip of a subframe and the combination of each descending synchronous code SYNC_DL, related operation is divided into 4 sections and carries out, referring to formula (2).It will be understood by those skilled in the art that the related operation that can adopt more or less segmentation under different application occasion.

At step S703,503 pairs of each correlated results of exporting from correlator 502 of energy normalized device carry out energy normalized the relevant normalization data of output, referring to formula (3).

At step S704, controller 507 judges whether correlator 502 has completed the related operation of current subframe and all 32 kinds of SYNC_DL codes.If judgment result is that of step S704 is negative, processes and turn back to step S702 to proceed the related operation of current subframe and lower a kind of SYNC_DL code; Otherwise process, advance to step S705.

At step S705, the relevant normalization data that maximum-value selector 505 is exported from energy normalized device 503 under the control of controller 507, select and export the relevant normalization data (referring to formula (4)) of each grouping internal mold value maximum, and at step S706, memory 508 will add up and store the precalculated position (referring to formula (5)) in memory 508 into by grouping from the data of maximum-value selector 505 outputs under the control of controller 507.Here because memory 508 is initialized to zero, thereby after completing the processing of the first subframe, memory 508 interior storages be the maximal correlation normalization data of each grouping of the correlated results of the first subframe and each SYNC_DL code; And after completing the processing of the second subframe, memory 508 interior storages be the maximal correlation normalization data of correlated results in each grouping and the accumulated value of the correlated results of the first subframe and the corresponding SYNC_DL code maximal correlation normalization data in respective packets of the second subframe and each SYNC_DL code; For the 3rd, the 4th ... etc. subframe, the rest may be inferred.

At step S707, controller 107 judges whether correlator 502 has completed the related operation of for example 4 (soft information merging frame number) subframes and all 32 kinds of SYNC_DL codes.If judgment result is that of step S707 is negative, processes and turn back to step S701 to receive next subframe and to repeat above-mentioned processing; Otherwise process, advance to step S708.

At step S708, alternative device 509 is selected the relevant normalization data of mould value maximum and obtains the grouping of living in of these data (from memory 508 by code channel, maximum grouping) packet number (referring to formula (7)), and by the relevant normalization data of the mould value maximum of each code channel is compared with predetermined threshold, the relevant normalization data of output mould value maximum is greater than the code Taoist monastic name of code channel of this predetermined threshold and the packet number of the maximum grouping of this code channel.

So far completed the processing of first stage, and be met threshold condition some may code channels and each may code channel in the position of relevant normalization data grouping of living in (that is, maximum grouping) of mould value maximum.Afterwards, controller 507 controls memory 508 to be reset to zero to reuse memory 508 (step S709) in second stage.

Second stage starts from step S710, wherein, correlator 502 controller 507 relevant initial/maximum that may code channel by each obtaining to the first stage in each subframe under the control of final position control section 5071 divide into groups the SYNC_DL code of corresponding grouped data and corresponding code channel carry out relevant (preferably, segmentation is relevant), and 503 pairs of each correlated results of exporting from correlator 502 of energy normalized device carry out energy normalized.It should be noted that correlator 502 can add to each grouped data the left and right boundary belt of predetermined length when second stage execution is relevant, to prevent multipath loss.

At step S711, memory 508 will add up and store the precalculated position (referring to formula (6)) in memory 508 into by chip from the data of energy normalized device 503 outputs under the control of controller 507.

At step S712, alternative device 509 by code channel from memory 508 select the relevant normalization data of mould value maximum and obtain these data the position of corresponding chip (maximum chip), and by the relevant normalization data of the mould value maximum of each code channel is compared with predetermined threshold, the relevant normalization data of output mould value maximum is greater than the position of the code Taoist monastic name of code channel and the maximum chip of this code channel of this predetermined threshold.Code channel and the corresponding community of activating the descending pilot frequency time slot position that has obtained chip precision have so just been filtered out.

As mentioned above, descending pilot frequency time slot correlation technique according to the present invention can adopt segmentation to be correlated with to overcome related algorithm inefficacy or the hydraulic performance decline that large frequency deviation causes, can carry out the uplink interference that energy normalized overcomes proximal subscribers to correlation, can adopt the soft merging of multiframe to overcome the decline of wireless channel, and can adopt packet memory and merge the cost that realizes that reduces system.

Below with reference to specific embodiments of the invention, the present invention has been described, but those skilled in the art all understand, can carry out various modifications, combination and change to these specific embodiments, and can not depart from the spirit and scope of the present invention that limited by claims or its equivalent.

Can perform step with hardware or software as required.Note, without departing from the scope of the invention, can add step, therefrom remove step or revise step wherein to the flow chart providing in this specification.In general, flow chart is just used to refer to a kind of possible sequence for the basic operation of practical function.

" memory " mentioned in this article can be any medium, includes but not limited to electricity, magnetic, light, electromagnetism, infrared or semiconductor system, device, system, equipment, propagation medium or computer storage.

Embodiments of the invention can utilize programming general purpose digital computer, utilize application-specific integrated circuit (ASIC), programmable logic device, field programmable gate array, light, chemistry, biological, system quantum or nanometer engineering, assembly and mechanism to realize.In general, function of the present invention can be realized by any means known in the art.Can use distributed or networked system, assembly and circuit.The communication of data or to transmit can be wired, wireless or by any other means.

Also will recognize, according to the needs of application-specific, one or more can the realization by more separated or more integrated mode in the key element shown in accompanying drawing, or be removed even in some cases or be deactivated.The journey logic bomb that realization can be stored in machine readable media is carried out above-mentioned any method with permission computer, also within the spirit and scope of the present invention.

In addition, it is only exemplary that any signal arrows in accompanying drawing should be considered to, rather than restrictive, unless separately there is concrete indication.In addition, unless otherwise, term "or" used herein is generally to refer to "and/or".When term is also contemplated as when the ability of separation or combination is not known, the combination of assembly or step also will be considered to record.

Claims (10)

1. for a relevant apparatus for downlink pilot frequency time slot search, minute two stages that are configured to carry out and are correlated with, and described relevant apparatus comprises:

Correlator, for carrying out relevant by the subframe receiving to the descending synchronous code of each code channel;

Energy normalized device, for carrying out energy normalized and export each relevant normalization data each correlated results of exporting from described correlator;

Maximum-value selector, for selecting and export the relevant normalization data of the mould value maximum in predetermined packet of packets length from the described relevant normalization data of described energy normalized device output in the first stage;

Memory, for press code channel in the described first stage, store the relevant normalization data of the mould value maximum in predetermined packet of packets described in each of subframe, and second stage may code channel for each screening in the described first stage in storage subframe to each described divide into groups relevant normalization data of corresponding grouped data of maximum that may code channel, wherein said maximum grouping is the residing grouping of maximal correlation normalized value that each that screen in the first stage may code channel;

Alternative device, for

In the described first stage, by code channel, from described memory, select the relevant normalization data of mould value maximum and the packet number of the residing maximum grouping of this data, and by comparing, the relevant normalization data of exporting described mould value maximum is greater than the code Taoist monastic name of code channel and the packet number of corresponding maximum grouping of predetermined threshold, and

In described second stage, by each, may from described memory, select the position of relevant normalization data and the corresponding maximum chip of this data of mould value maximum by code channel, and by relatively, the relevant normalization data of exporting described mould value maximum is greater than the code Taoist monastic name of code channel of predetermined threshold and the position of corresponding maximum chip; And

Controller, for in the described first stage, described correlator being controlled as receiving successively complete subframe, and in described second stage, described correlator is controlled as for each described may code channel reception and the maximum of each possibility code channel corresponding grouped data of dividing into groups.

2. the relevant apparatus for downlink pilot frequency time slot search according to claim 1, wherein, described correlator, for the related operation each time of a subframe and each descending synchronous code, is divided into multistage and carries out described related operation.

3. the relevant apparatus for downlink pilot frequency time slot search according to claim 1, wherein, described controller is also controlled so that described correlator was correlated with to 4 subframes successively in the described first stage.

4. the relevant apparatus for downlink pilot frequency time slot search according to claim 3, also comprise accumulator, described accumulator is used in the first stage the relevant normalization data of mould value maximum of each predetermined packet of packets from described maximum-value selector output and the corresponding data of the last subframe that described memory is stored is cumulative, and in second stage, the corresponding data of last subframe each the relevant normalization data from described energy normalized device output and described memory is cumulative.

5. the relevant apparatus for downlink pilot frequency time slot search according to claim 1, wherein, described predetermined packet of packets length is 32 chips.

6. the relevant apparatus for downlink pilot frequency time slot search according to claim 1, wherein, described correlator in second stage to each described may code channel maximum divide into groups corresponding grouped data add left and right protection bring carry out relevant.

7. for a correlation technique for downlink pilot frequency time slot search, comprise first stage and second stage, wherein,

The described first stage comprises:

Receive one or more subframes;

The subframe receiving is carried out relevant and exported each correlated results to the descending synchronous code of each code channel successively;

Described each correlated results is carried out to energy normalized to export relevant normalization data;

For each described code channel, the relevant normalization data of the internal mold value maximum of respectively dividing into groups is also exported in minute group selection;

For each described code channel, the relevant normalization data correspondence of the described mould value maximum of the respective packets of described one or more subframes is added up and stored; And

By code channel, select the relevant normalization data of stored mould value maximum and the packet number of the residing maximum grouping of this data, and by comparing, the relevant normalization data of exporting described mould value maximum is greater than the code Taoist monastic name of code channel and the packet number of corresponding maximum grouping of predetermined threshold; And

Described second stage comprises:

Receive one or more subframes; For each the possibility code channel filtering out in the described first stage, by carrying out relevantly to each described divide into groups descending synchronous code of corresponding grouped data and corresponding possible code channel of maximum that may code channel in the subframe receiving, and each correlated results is carried out to energy normalized to export relevant normalization data;

For each described possibility code channel, the relevant normalization data of one or more subframes that described second stage is received adds up and stores by chip is corresponding; And

By code channel, select the position of relevant normalization data and the corresponding maximum chip of this data of stored mould value maximum, and by relatively, the relevant normalization data of the described mould value maximum of output second stage is greater than the code Taoist monastic name of code channel of predetermined threshold and the position of corresponding maximum chip.

8. the correlation technique for downlink pilot frequency time slot search according to claim 7, wherein, for the related operation each time of a subframe and each descending synchronous code, is divided into multistage and carries out described related operation.

9. the correlation technique for downlink pilot frequency time slot search according to claim 7, wherein, the length of described grouping is 32 chips.

10. the correlation technique for downlink pilot frequency time slot search according to claim 7, wherein, in described second stage relevant, to adding left and right boundary belt with each described maximum corresponding grouped data of dividing into groups that may code channel.

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