CN100589333C - The method and apparatus of the route searching in the TDD-CDMA system - Google Patents

Abstract

A kind of method and apparatus that is applied to the route searching in the TDD-CDMA system, by simultaneously based on lead in the time slot 0 descending synchronous code on sign indicating number, the descending pilot frequency time slot (DwPTS) and non-time slot 0 in lead the Path selection result that sign indicating number obtains, after carrying out cascading judgement, obtain the route searching result.The present invention can be under more abominable disturbed condition, particularly exist under the situation of co-channel interference, with than higher probabilistic search active path and avoid selecting wrong path position effectively, thereby can guarantee demodulation, the regularly normal operation of modules such as tracking.

Description

The method and apparatus of the route searching in the TDD-CDMA system

Technical field

The present invention relates to a kind of wireless communication system of being applied to, be particularly related to a kind of time division SCDMA (Time Division Synchronous Code-Division Multiple Access that is applied to, abbreviation TD-SCDMA) in the mobile communication system, is used to carry out the method and apparatus of route searching.

Background technology

Nineteen forty-six, the Bell Laboratory of the U.S. has just proposed the service area of mobile phone is divided into several sub-districts, and a base station is established in each sub-district, constitutes honeycomb (Cellular) the mobile communication new ideas of cellular communication system.1978, this system succeedd in the Chicago,U.S test, and formally puts it into commercial operation in nineteen eighty-three.The employing of cellular system makes identical frequency to reuse, thereby has increased the capacity of mobile communication system greatly, has adapted to the desirability that mobile communication subscriber increases suddenly.The development of cell mobile communication systems experienced one from the simulation net to digital network, from frequency division multiple access (FDMA) to time-division multiple access (TDMA) with the process of code division multiple access (CDMA).

Along with development of times, people comprise the requirement to communication quality and class of business etc. to the requirement of communication, and are also more and more higher.The third generation (3G) mobile communication system is grown up in order to satisfy this requirement just.It is as basic point of departure with global general-use, system synthesis, and attempt to set up the mobile comprehensive service digital network in a whole world, the function of various mobile communication system such as comprehensive honeycomb, wireless, paging, cluster, mobile data, mobile-satellite, aerial and sea, provide and the professional compatibility of fixed telecommunication network, multiple speech and the non-speech service that quality is suitable, carry out the global roaming of pocket personal terminal, thus realize human dream of anywhere, any time and anyone ideal that communicates.

That most critical is radio transmission techniques (RTT) in the 3-G (Generation Three mobile communication system).The RTT candidate motion that International Telecommunications Union in 1998 collects: except that 6 satellite interface technical schemes, the terrestrial wireless interfacing has 10 schemes, is divided into two big class: CDMA and TDMA, and wherein CDMA occupies an leading position.In CDMA technology, International Telecommunications Union has accepted 3 kinds of standards at present altogether, i.e. the TD-SCDMA standard of the CDMA 2000 of the W-CDMA (Wideband Code Division Multiple Access (WCDMA)) of Europe and Japan, the U.S. and China.

Compare with other 3G (Third Generation) Moblie standard, TD-SCDMA has adopted many exclusive advanced technologies, and all has outstanding advantage aspect the technology, economic two.TD-SCDMA adopts time division duplex (Time Division Duplex, TDD), smart antenna (Smart Antenna), joint-detection technology such as (JointDetection), the availability of frequency spectrum is very high, can solve the problem of high population density area frequency resource anxiety, and have potential advantages aspect the multimedia services such as asymmetric mobile data such as internet browsing and video request program.

As shown in Figure 1, be the frame structure schematic diagram of TD-SCDMA system.This structure is according to low spreading rate time division duplex (LCR-TDD) pattern (1.28Mcps) among 3G collaborative project (3GPP) the standard TS 25.221 (Release 4), perhaps provides among China Wireless Telecommunication Standar (CWTS) the standard TSM 05.02 (Release 3).The chip of TD-SCDMA system (chip) speed is 1.28Mcps, and the length of each radio frames (Radio Frame) 100,101 is 5ms, i.e. 6400 chips; And for 3GPP LCR-TDD system, the length of each radio frames is 10ms, and the subframe that it can be divided into two length is 5ms (subframe), each subframe comprise 6400 chips.

Wherein, the radio frames 10 in each TD-SCDMA system, perhaps the subframe in the LCR system can be divided into 7 time slots again (TS0～TS6) 11 ₀-11 ₆, two pilot time slots comprise: descending pilot frequency time slot (DwPTS) 12 and uplink pilot time slot (UpPTS) 14, and protection interval (Guard) 13.Further, the TS0 time slot 11 ₀Be used to bearing system broadcast channel and other possible downlink traffic channel; And TS1～TS6 time slot 11 ₁-11 ₆Then be used to carry the uplink and downlink Traffic Channel.It is synchronous that uplink pilot time slot (UpPTS) 14 and descending pilot frequency time slot (DwPTS) 12 are used to set up initial uplink and downlink respectively.

TS0～TS6 time slot 11 ₀-11 ₆Length be 0.675ms, i.e. 864 chips wherein comprise data segment (DATA1) 17 that two segment length are 352 chips and (DATA2) 19, and a middle segment length are the training sequence of 144 chips---in lead sign indicating number (Midamble) sequence 18.The Midamble sequence is significant at TD-SCDMA, comprise cell ID, channel estimating and synchronously modules such as (comprising Frequency Synchronization) all to use it.The protection that DwPTS time slot 12 comprises 32 chips at interval 20 and one long be descending synchronous code (SYNC-DL) code word 15 of 64 chips, its effect is cell ID and sets up initial synchronisation; And the UpPTS time slot comprise one long be uplink synchronous code (SYNC-UL) code word 16 of 128 chips, subscriber terminal equipment utilizes it to carry out relevant up access procedure.

As shown in Figure 2, be a kind of existing installation drawing that is used for the Path selection of user terminal.General, a pilot tone (Pilot) signal can be sent out in each sub-district in the system, helps the terminal of this sub-district to realize functions such as synchronous.This pilot signal is called training sequence (Training Sequence) again; User terminal extracts the received signal sampling corresponding with training sequence, and itself and training sequence is slided relevant (Correlation) by after carrying out analog digital conversion to received signal and accepting filter, and obtains correlated results.This slip relevant treatment is finished by sliding correlation detector 20.Suppose that length is { t for the training sequence of N ₁, t ₂..., t _N, corresponding reception data-signal is { d _k, over-sampling rate (being the hits of each chip) is Q, the associative operation on the position n that then delays time can be used following formulate:

$p_n=\underset{k=1}{\overset{N}{\mathrm{\Σ}}}{d}_{n+(k-1)\×Q}\·t_k^{*},(n=\mathrm{1,2},\·\·\·,W)$

Wherein, subscript " * " expression is asked and is gripped operation altogether.

Certainly, except above-mentioned said correlation technique, also can adopt other to obtain correlated results such as " deconvolution " method (De-convolution).For example,, utilize it to lead code structure in distinctive, can calculate vector as follows for the TD-SCDMA system

$\stackrel{\→}{p}=\mathrm{IFFT}(\mathrm{FFT}\left(\stackrel{\→}{d}\right)/\mathrm{FFT}\left(\stackrel{\→}{t}\right)),(n=\mathrm{1,2},\·\·\·,W)$

Wherein, vector With

Represented received signal sampling and training sequence respectively, FFT and IFFT have represented forward and reverse fast Flourier (Fournier) conversion respectively.

Time-delay envelope calculator 21 is used for calculating time-delay envelope (Delay Profile) { d _k.Time-delay envelope value on time-delay position n is correlated results p _nAmplitude or performance number, that is:

DP _n＝|p _n|(n＝1，2，…，W)

Perhaps:

DP _n＝|p _n| ²(n＝1，2，…，W)

Above various in, parameter W has represented the width of time-delay envelope.General, different situations according to the wireless channel communication environments, the time-delay of wireless channel does not wait from several chips to tens chip, choosing of time-delay envelope width W, should guarantee in most cases can comprise the bigger propagation path of those time-delays, therefore, the width of general time-delay envelope is tens to tens chip width.

Then, based on this time-delay envelope, adjudicate the positional information that just obtains active path by certain mode by path selector 22.As shown in Figure 3, be a kind of schematic diagram that carries out the method for Path selection based on the time-delay envelope.In the time-delay envelope on certain time-delay position if bigger peak value, then generally can think to have active path on this time-delay position; Otherwise, if certain locational value of delaying time is very little, then can think not have active path on this time-delay position, and this locational less value causes owing to noise or interference, so the relevant position is also referred to as " noise path ".Based on this time-delay envelope, can be by pre-set threshold or threshold value P through calculating _SEL, value is higher than P in the envelope of selecting to delay time _SELThe path, and they are exported as active path.A kind of calculating path is selected threshold value P _SELMethod as shown in Figure 3, can be divided into following steps:

At first, find out the maximum in the time-delay envelope, establishing its power is P _Max

Secondly, calculate the average power of all noise path, establish it and be P _NoiseWherein, so-called noise path can obtain according to the active path information that obtains in last (son) frame;

Once more, according to P _MaxAnd P _Noise, come calculating path to select threshold value P _SEL:

P _SEL＝max(P _max-T ₁，P _noise+T ₂)；

Wherein, T ₁And T ₂Be respectively two default greater than zero threshold value, (x y) returns the greater among variable x and the y to function m ax.

As shown in Figure 3, use above-mentioned steps, selected four values to be higher than P altogether _SELActive path.Adopt the characteristics of this routing resource to be, the Path selection thresholding is dynamically adjusted according to maximum path power disturbance level, therefore can overcome the adverse effect of interference more effectively, under more abominable propagation channel conditions, also can select the stronger true propagation path of those power more exactly, and reduce those because " interference path " that factors such as interference, noise cause is falsely dropped the probability into " active path ".

The performance of good route searching has crucial meaning to user terminal.For example,, need at first carry out route searching, only on those active paths, carry out despreading (De-spread) then and handle, again the despreading result on each path be carried out maximum ratio at last and merge for RAKE receiver commonly used in the cdma system.Same, joint-detection (JointDetection) method at the TD-SCDMA system equally also needs routing information to generate so-called sytem matrix.If omitted some active path or some noise contribution judged by accident into active path, will produce very adverse influence to demodulation performance so, finally may cause the rising of the error rate and the deterioration of transmission quality.

And for example, regularly tracking module also can decide terminal adjustment regularly based on the positional information of active path.As shown in Figure 4, carry out the regularly schematic diagram of the method for adjustment for a kind of user terminal based on active path information.If finding before current timing point A has new path B to occur, then regularly adjusting forward, concrete adjustment amount may be different in different implementation methods; Otherwise, if under the situation that path A has disappeared or power is very low of current timing point, and regularly have active path C behind the point, then regularly adjusting backward.General, the positional information of active path can periodically be upgraded, for example: every frame update, perhaps behind some frames, upgrade, make regularly tracking module can be more promptly at the change in location of propagation path, carry out corresponding regularly adjustment, the receptivity of terminal can be because of losing active path even losing deterioration or the link-attached failure that performance takes place synchronously as much as possible.

Compare with other system, there are a lot of characteristics in the TD-SCDMA system.On the one hand, having a plurality of pilot signals in the TD-SCDMA system can use for user terminal, comprising:

(a) on the TS0 in lead the sign indicating number (MA) first skew (shift), corresponding two code channels (code channel) of " beacon " channel (beaconchannel), this channel comprises Primary Common Control Physical Channel (P-CCPCH) etc., and exists in the sub-district always;

(b) DwPTS has comprised descending synchronous code (SYNC-DL) code word of 64 chips, generally also exists in the sub-district always, is used to help user terminal to carry out the sub-district and waits processing synchronously;

(c) lead in other on the TS0 on sign indicating number skew and other time slot in lead sign indicating number, when on TS0 goes up except the 1st, 2 code channels or other time slot, having common down channel or dedicated channel, also have certain or a plurality of skew of leading sign indicating number in corresponding and exist; Especially, unless adopted discontinuous emission (DTX) mode, otherwise for the skew of leading sign indicating number in first physical channel resources correspondence of first time slot of this channel allocation certainly exists, send even there is information, one " special burst " (Special Burst) content also can be filled out in the base station;

On the other hand, (Intra-Frequency Interference) is also very important in the interference that is faced in the TD-SCDMA system, particularly co-channel interference.Because the TD-SCDMA system does not adopt so-called " soft handover " (Soft Handoff) mode, therefore except this cell signal, other and current area adopt the co-frequency cell (Intra-Frequency Cell) of same carrier frequencies in the network, all might cause certain interference to current area; And when adopting soft handover,, reduce co-channel interference so other co-frequency cell also can be used to send subscriber signal owing to adopt the mode of grand diversity.Although can adopt in the TD-SCDMA system such as smart antenna (Smart Antenna), dynamic channel allocation technology types such as (DCA) and effectively reduce co-channel interference.But, such as the pilot signal of TS0 and this class of DwPTS, owing to need to cover full sub-district, so above-mentioned technology and inapplicable; But system can overcome co-channel interference on these time slots to a certain extent by modes such as fan antenna, channelings.

As shown in Figure 5, for obtain by Computer Simulation have co-channel interference the time the example of time-delay envelope.Simulated conditions is to suppose that the Cell ID of current service cell equals 0; Simultaneously, its Cell ID equals 127 with interfered cell frequently one, and its P-CCPCH/DwPTS power is all than high 3 dB of Serving cell.The 1st, 2,7,8,9,13,14 code channels (leading the sign indicating number skew in corresponding the 1st, 4,5,7) on the TS0 of Serving cell, have been used; And on the TS0 of interfered cell, used the 1st, 2,5,6,7,11,12 code channels (leading the sign indicating number skew in corresponding the 1st, 3,4,6).And the interfered cell signal reaches user terminal than Zao 10 chips of Serving cell signal.Propagation channel is assumed to be single footpath static environment.Fig. 5 a leads the time-delay envelope average that yard calculations of offset obtains for adopting on the TS0 first; Fig. 5 b represents with solid line among the figure for the time-delay envelope average that the descending synchronous code that adopts among the DwPTS calculates.As a comparison, the situation under the no co-channel interference of also having drawn among Fig. 5 is represented by dotted lines among the figure.Abscissa is the time-delay with respect to current timing synchronous points among the figure, and ordinate is each locational value of delaying time (for outstanding difference, having adopted logarithm value here).The width of time-delay envelope is near positive and negative 24 the chip width the initial point, and the envelope of respectively delaying time has carried out normalization according to the value of initial point place (one true propagation path position) respectively.By this figure as seen, lead the descending synchronous code among sign indicating number or the DwPTS in no matter adopting, under the no co-channel interference situation, a peak value only near current timing synchronous points (being initial point), occurs, and all very little in other locational envelope value, than about low at least 15 dB of peak value; And if after adding co-channel interference,, obviously improve the peak value that has even surpassed timing synchronous points place owing to the effect of disturbing near current timing synchronous points (initial point) in other locational envelope value although the peak value existence is still arranged.

Cause the reason of this phenomenon to be: cross-correlation (cross-correlation) characteristic of leading in the difference between the sign indicating number generally is not desirable, same, their cross correlation between the different descending synchronous codes generally neither be desirable, that is also may have some bigger correlation peaks at non-initial point place.And, comparatively speaking, in the their cross correlation of leading between the sign indicating number compare with descending synchronous code, more abominable.Like this, because the existence of these false correlation peaks, just might cause user terminal when carrying out Path selection based on the time-delay envelope, the position at these peak value places (promptly aforesaid " interference path ") is also selected as active path, and caused demodulation and/or the regularly mis-behave or the failure of tracking module.

As seen from the above analysis, how to utilize more distinctive pilot signals in the TD-SCDMA system, at its distinctive disturbed condition, design a kind of well behaved method for searching path and device, for the demodulation of user terminal, regularly processing such as synchronous is vital.

Summary of the invention

The object of the present invention is to provide a kind of method and apparatus that subscriber terminal equipment in the time division SCDMA mobile communication system carries out route searching that is applied to, it can be under the condition of low Signal to Interference plus Noise Ratio (SINR), particularly under the situation that has stronger co-channel interference, search out the actual propagation path with higher accuracy rate.

In order to solve the problems of the technologies described above, the method for the route searching in the TDD-CDMA system provided by the invention may further comprise the steps:

Step 1, based on a processing of leading the sign indicating number skew on the TS0 time slot, comprise following substep:

Step 1.1, slip correlation computations substep: in leading on the TS0 time slot on the TS0 time slot of the skew of sign indicating number or several skew and corresponding input, lead a yard sample sequence d={d _kThe correlation computations of sliding, obtain correlated results and be

$p_k^{0,F,S}=\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{d}_{(k+i)\mathrm{mod}N}\·\·t_i^S$

Wherein, F represents the residing subframe sequence number of TS0 time slot, and S represents to lead in selected the sequence number of sign indicating number skew, subscript 0 expression be based on the TS0 time slot in lead the result that yard calculations of offset obtains, N=128 leads the length of sign indicating number part in being, basic middle guiding code sequence is t={t _k, lead yard offset sequence among its S and be

$t^S=\left\{t_k^S\right\}.$

In the described step 1.1, also can carry out the deconvolution processing, obtain correlated results and be leading yard sample sequence in leading on the TS0 time slot on the TS0 time slot of the skew of sign indicating number or several skew and corresponding input:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d leads a yard sample sequence in representing on the TS0 time slot, and t represents basic middle guiding code sequence, and FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{0, F, S}Can lead a yard partial data acquisition among the vectorial p in corresponding S by extracting.

In the step 1.1, the described relevant selected mode of leading the sign indicating number skew that is used for sliding is: on the TS0 time slot, lead the sign indicating number skew in first and always exist for " beacon " channel (beacon channel) is employed, so should in lead sign indicating number and be offset certain chosen use; Led in this first sign indicating number skew corresponding the P-CCPCH channel, described P-CCPCH is a kind of common signal channel in the TD-SCDMA system, and exists in the sub-district always.

In the step 1.1, the described relevant selected mode of leading the sign indicating number skew that is used for sliding is: if system adopts sky-sign indicating number transmit diversity techniques (Space-Code Transmit Diversity is called for short SCTD), then lead yard being offset a chosen use in second.

Whether described SCTD is used, and informs user terminal by network side, is perhaps detected voluntarily by user terminal.

In the step 1.1, the described relevant selected mode of leading the sign indicating number skew that is used for sliding is: if on the TS0 time slot, there is other common signal channel except that P-CCPCH, or dedicated channel, so these channel correspondences in lead sign indicating number and be offset a chosen use.In the TD-SCDMA system, except this common signal channel of P-CCPCH, other common signal channels have comprised inferior Common Control Physical Channel (S-CCPCH), paging channel (PICH) and physical access channel (FPACH) etc.

Each common signal channel of described correspondence, or dedicated channel in lead sign indicating number skew by user terminal according to the type of respective channel and/or in lead a yard testing result and be activated selected.

Step 1.2, time-delay envelope calculate substep: according to step 1.1 output when the front slide correlated results, through after asking amplitude and average treatment, obtain the envelope of delaying time, it comprises following steps:

Step 1.2.1, calculate in the TS0 time slot of F subframe, leading in S in the sign indicating number skew by the width of asking range value to obtain is the time-delay envelope of W

${\mathrm{SubDP}}_n^{0,F,P}=\left|p_n^{0,F,S}\right|$ (n＝1，2，…，W)

Among the described step 1.2.1, calculate in the TS0 time slot of F subframe, leading in S in the sign indicating number skew by the width of asking performance number to obtain is the time-delay envelope of W

$\mathrm{Sub}{\mathrm{DP}}_n^{0,F,S}={\left|p_n^{0,F,S}\right|}^2$ (n＝1，2，…，W)

Step 1.2.2, will merge based on leading the time-delay envelope that the sign indicating number skew obtains on the TS0 time slot in all, the width that obtains in the TS0 time slot of F subframe is the merging time-delay envelope of W

${\mathrm{DP}}_n^{0,F}=\underset{S\∈S}{\mathrm{\Σ}}\mathrm{Sub}{\mathrm{DP}}_n^{0,F,S}$ (n＝1，2，…，W)

Wherein, comprised in the S set and all activatedly on the TS0 time slot led the sign indicating number skew in selected;

Step 1.2.3, the merging time-delay envelope that obtains according to the F subframe

With the average delay envelope

Upgrade, upgrade to handle can be expressed as with formula:

(n＝1，2，…，W)

Wherein, parameter alpha ₀For the real number of span between [0,1], be used to control average weight, α ₀Value more little, then current merging time-delay envelope DP ^{0, F}Weight in average is just big more; AveDP _n ⁰(old) and AveDP _n ⁰(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ⁰Value on the n point; Average delay envelope AveDP ⁰Subscript 0 expression be based on the TS0 time slot in lead the result that yard calculations of offset obtains.

Carry out leading in a plurality of the merging of time-delay envelope and the averaging in continuous some subframes of sign indicating number skew by above-mentioned steps 1.2 described modes, be in order to utilize received signal information as far as possible, suppress the influence of noise and interference, this time-delay envelope can be followed reflect the actual channel propagation characteristic exactly; In addition, also can more effectively suppress the influence that decline (fading) brings, promptly can finally do not leaked choosing because of certain paths constantly because decline causes amplitude to reduce.

Step 1.3, Path selection substep: the time-delay envelope according to step 1.2 obtains through passing by on one's way through selecting, obtains Path selection result 1; Described Path selection result is meant a set that comprises a collection of path position information;

In the step 1.3, the method for described road through selecting is: determine the Path selection thresholding based on peak-peak and noise power, to carry out Path selection.

Step 2, based on the processing of the descending synchronous code on the DwPTS, comprise following substep:

Step 2.1, slip correlation computations substep: with the descending synchronous code sample sequence d={d on the DwPTS of the descending synchronous code sequence on the DwPTS that uses in the sub-district and corresponding input _kThe correlation computations of sliding, obtain correlated results and be

${\mathrm{<figure-callout\; id="1"\; label="p\; k"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">p</figure-callout>}}_k^{}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{k+i}\&CenterDot;t_i$

Wherein, F represents the residing subframe sequence number of DwPTS, and subscript 1 expression is based on the result that the descending synchronous code on the DwPTS calculates, and N=64 is the length of descending synchronous code part, and the downstream synchronization code word sequence is t={t _k.

In the described step 2.1, also the descending synchronous code sample sequence on the DwPTS of the descending synchronous code sequence on the DwPTS that uses in the sub-district and corresponding input can be carried out deconvolution and handle, obtain correlated results and be:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d represents the descending synchronous code sample sequence on the DwPTS, and t represents descending synchronous code preface word row, and FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{1, F}Can obtain by the data that extract appropriate section among the vectorial p.

Step 2.2, time-delay envelope calculate substep: according to step 2.1 output when the front slide correlated results, through after asking amplitude and average treatment, obtain the envelope of delaying time, it comprises following steps:

Among the DwPTS of step 2.2.1, calculating F subframe, be the time-delay envelope of W by the width of asking range value to obtain

${\mathrm{<figure-callout\; id="1"\; label="DP\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">DP</figure-callout>}}_n^{}=\left|{\mathrm{<figure-callout\; id="1"\; label="p\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">p</figure-callout>}}_n^{}\right|$ (n＝1，2，…，W)

Among the described step 2.2.1, calculating among the DwPTS of F subframe, is the time-delay envelope of W by the width of asking performance number to obtain

${\mathrm{<figure-callout\; id="1"\; label="DP\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">DP</figure-callout>}}_n^{}={\left|{\mathrm{<figure-callout\; id="1"\; label="p\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">p</figure-callout>}}_n^{}\right|}^2$ (n＝1，2，…，W)

Step 2.2.2, the merging time-delay envelope that obtains according to the F subframe

With the average delay envelope

Upgrade, this renewal is handled and can be expressed as with formula:

(n＝1，2，…，W)

Wherein, parameter alpha ₁For the real number of span between [0,1], be used to control average weight, this α ₁Value more little, then current merging time-delay envelope DP ^{1, F}Weight in average is just big more; AveDP _n ¹(old) and AveDP _n ¹(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ¹Value on the n point; Average delay envelope AveDP ¹Subscript 1 expression be based on the result that the descending synchronous code on the DwPTS calculates.

By above-mentioned steps 2.2 described modes, the time-delay envelope that the descending synchronous code based among the DwPTS in continuous some subframes is obtained averages, be in order to utilize received signal information as far as possible, suppress the influence of noise and interference, this time-delay envelope can be followed reflect the actual channel propagation characteristic exactly.

Step 2.3, Path selection substep: the time-delay envelope according to step 2.2 obtains through passing by on one's way through selecting, obtains Path selection result 2; Described Path selection result is meant a set that comprises a collection of path position information;

In the step 2.3, the method for described road through selecting is: determine the Path selection thresholding based on peak-peak and noise power, to carry out Path selection.

Step 3, if network side by the signaled user terminal on the non-TS0 time slot of current subframe, it is the last common down channel that needs user terminal to receive that exists of descending time slot TS2～TS6, then continue execution in step 3.1～3.3, on the descending time slot of non-TS0 time slot, lead the sign indicating number processing; Otherwise, direct execution in step 4;

Described common down channel comprises auxiliary Common Control Channel (S-CCPCH), described auxiliary Common Control Channel comprises paging channel (PCH) and forward access channel (FACH), user terminal all will remove to receive these common signal channels in paging receiving information or when inserting at random.When the user set up special-purpose the connection, network side will assigned with dedicated channel transmit information such as voice, data for user terminal.

Step 3.1, slip correlator step: with lead on the non-TS0 time slot on the non-TS0 time slot of the skew of sign indicating number or several skew and corresponding input in lead a yard sample sequence d={d _kThe relevant treatment of sliding, obtain correlated results and be

$p_k^{2,F,X,S}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{(k+i)\mathrm{mod}N}\&CenterDot;t_i^S$

Wherein, F represents the residing subframe sequence number of TS0 time slot, X represents the sequence number of the descending time slot of this non-TS0 time slot, S represents to lead in selected the sequence number of sign indicating number skew, subscript 2 expression be based on the non-TS0 time slot in lead the result that yard calculations of offset obtains, N=128 leads sign indicating number length partly in being, basic middle guiding code sequence is t={t _k, lead yard offset sequence among its S and be

In the described step 3.1, also can with lead on the non-TS0 time slot on the non-TS0 time slot of the skew of sign indicating number or several skew and corresponding input in lead yard sample sequence and carry out the deconvolution processing, obtain correlated results and be:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d represent on the non-TS0 time slot in lead a yard sample sequence, t represents basic middle guiding code sequence, FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{2, F, X, S}Can lead a yard partial data acquisition among the vectorial p in corresponding S by extracting.

In the step 3.1, the described relevant selected mode of leading the sign indicating number skew that is used for sliding is: in the cycle of activity of common signal channel or dedicated channel (active period), always have signal to exist, this moment their correspondences in to lead the sign indicating number skew just chosen.

In the step 3.1, the described relevant selected mode of leading the sign indicating number skew that is used for sliding is: when can not determine whether common signal channel or dedicated channel have message transmission in current subframe, then need by in lead sign indicating number and detect and to judge, lead sign indicating number thereby activate in selected.

Step 3.2, time-delay envelope calculate substep: according to step 3.1 output when the front slide correlated results, through after asking amplitude and average treatment, obtain the envelope of delaying time, it comprises following steps:

Step 3.2.1, calculate among the time slot X of F subframe, leading in S in the sign indicating number skew by the width of asking range value to obtain is the time-delay envelope of W

${\mathrm{SubDP}}_n^{2,F,X,S}=\left|p_n^{2,F,X,S}\right|$ (n＝1，2，…，W)

Among the described step 3.2.1, calculate among the time slot X of F subframe, leading in S in the sign indicating number skew by the width of asking performance number to obtain is the time-delay envelope of W

${\mathrm{SubDP}}_n^{2,F,X,S}={\left|p_n^{2,F,X,S}\right|}^2$ (n＝1，2，…，W)

Step 3.2.2, will merge based on leading the time-delay envelope that the sign indicating number skew obtains on all non-TS0 time slots in all in the F subframe, obtain the merging time-delay envelope among the non-TS0 of F subframe

${\mathrm{DP}}_n^{2,F}=\underset{X\&Element;X}{\mathrm{\&Sigma;}}\underset{S\&Element;S_X}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{2,F,X,S}$ (n＝1，2，…，W)

Wherein, set X has comprised the non-TS0 time slot that all user terminals use, and S set _XHaving comprised time slot X goes up and leads the sign indicating number skew in all activated.

Step 3.2.3, the merging time-delay envelope that obtains according to the F subframe

With the average delay envelope

Upgrade, this renewal is handled and can be expressed as with formula:

(n＝1，2，…，W)

Wherein, parameter alpha ₂For the real number of span between [0,1], be used to control average weight, this α ₂Value more little, then current merging time-delay envelope DP ^{2, F}Weight in average is just big more; AveDP _n ²(old) and AveDP _n ²(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ²Value on the n point; Average delay envelope AveDP ²Subscript 2 expression be based on the non-TS0 time slot in lead the result that yard calculations of offset obtains.

Carry out leading in a plurality of the merging and the average treatment in continuous some subframes of the time-delay envelope of sign indicating number skew by above-mentioned steps 3.2 described modes, be in order to utilize received signal information as far as possible, suppress the influence of noise and interference, this time-delay envelope can be followed reflect the actual channel propagation characteristic exactly.

Step 3.3, Path selection substep: the time-delay envelope according to step 3.2 obtains through passing by on one's way through selecting, obtains Path selection result 3; Described Path selection result is meant a set that comprises a collection of path position information;

In the step 3.3, the method for described road through selecting is: determine the Path selection thresholding based on peak-peak and noise power, to carry out Path selection.

Step 4, for the Path selection result 1 that step 1 obtains, the Path selection result 2 that step 2 obtains, and the Path selection result 3 who obtains when step 3 is carried out judge whether whether it needs to carry out cascading judgement, promptly need execution in step 5;

In the step 4, described judgement is respectively organized the method whether the Path selection result can carry out cascading judgement and is:

Current more intense interference or the noise of whether existing;

If not, then only need step 1 is led the Path selection result 1 that yard migration processing obtains on the TS0 time slot, perhaps only need step 2 is handled Path selection result's 2 execution in step 5 that obtain based on the descending synchronous code on the DwPTS, carry out cascading judgement;

Further, when if user terminal also is in connection mode (connected mode) simultaneously, then need simultaneously step 1 is led Path selection result's 3 execution in step 5 that yard migration processing obtains based on leading Path selection result 1 and the step 3 that yard migration processing obtains on the TS0 time slot on the DPCH (DPCH) of non-TS0 time slot, carry out cascading judgement; Perhaps simultaneously step 2 is handled the Path selection result 2 and the step 3 that obtain based on the descending synchronous code on the DwPTS and on the DPCH (DPCH) of non-TS0 time slot, lead Path selection result's 3 execution in step 5 that yard migration processing obtains, carry out cascading judgement;

If, then need simultaneously step 1 to be led Path selection result 1 and step 2 Path selection result's 2 execution in step 5 that processing obtains based on the descending synchronous code on the DwPTS that yard migration processing obtains on the TS0 time slot, carry out cascading judgement;

Further, when if user terminal also is in connection mode (connected mode) simultaneously, then need simultaneously step 1 to be led the Path selection result 1 that yard migration processing obtains on the TS0 time slot, step 2 is handled the Path selection result 2 and the step 3 that obtain based on the descending synchronous code on the DwPTS and lead Path selection result's 3 execution in step 5 that yard migration processing obtains on the DPCH (DPCH) of non-TS0 time slot, carries out cascading judgement.

In the step 4, the method whether the Path selection result can carry out cascading judgement is respectively organized in described judgement: if when user terminal is in regularly tracing mode, then need simultaneously step 1 to be led the Path selection result 1 that yard migration processing obtains on the TS0 time slot, step 2 is handled the Path selection result 2 who obtains based on the descending synchronous code on the DwPTS, and when step 3 is carried out, in on the DPCH of non-TS0 time slot, lead the Path selection result 3 that yard migration processing obtains, carry out cascading judgement.

Step 5, cascading judgement: i.e. one group or some groups of Path selection results of the carried out cascading judgement that obtains according to step 4, carry out cascading judgement, output active path positional information;

Described cascading judgement, can carry out based on following method: and if only if, and certain paths position is comprised in when Y organizes among the Path selection result at least, thinks that just this locational path is an active path, and wherein, Y is a positive integer.

Simultaneously, the device of the route searching in the TDD-CDMA system provided by the invention, comprise: on the TS0 time slot that is connected in parallel, lead a yard processing unit, lead a yard processing unit on descending synchronous code processing unit on the DwPTS and the non-TS0 time slot, and the connected judgment device of difference;

Lead yard processing unit on the described TS0 time slot and comprise first sliding correlation detector that connects successively, the first time-delay envelope calculator and first path selector;

Described first sliding correlation detector is used for leading a yard sample sequence d={d on the TS0 time slot of the skew of leading sign indicating number on the TS0 or several skew and corresponding input _kThe correlation computations of sliding, obtain correlated results and be

$p_k^{0,F,S}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{(k+i)\mathrm{mod}N}\&CenterDot;t_i^S$

Wherein, F represents the residing subframe sequence number of TS0 time slot, and S represents to lead in selected the sequence number of sign indicating number skew, subscript 0 expression be based on the TS0 time slot in lead the result that yard calculations of offset obtains, N=128 leads the length of sign indicating number part in being, basic middle guiding code sequence is t={t _k, lead yard offset sequence among its S and be

$t^S=\left\{t_k^S\right\}.$

Described first sliding correlation detector also can carry out the deconvolution processing with leading yard sample sequence in leading on the TS0 time slot on the TS0 time slot of the skew of sign indicating number or several skew and corresponding input, exports correlated results and is:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d leads a yard sample sequence in representing on the TS0 time slot, and t represents basic middle guiding code sequence, and FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{0, F, S}Can lead a yard partial data acquisition among the vectorial p in corresponding S by extracting.

The described first time-delay envelope calculator, according to the output of first sliding correlation detector when the front slide correlated results, ask amplitude and average computing, output time-delay envelope:

The described first time-delay envelope calculator calculates earlier in the TS0 time slot of F subframe, and leading in S in the sign indicating number skew by the width of asking range value to obtain is the time-delay envelope of W

${\mathrm{SubDP}}^{0,F,S}=\left\{{\mathrm{SubDP}}_k^{0,F,S}\right\}:$

${\mathrm{SubDP}}_n^{0,F,S}=\left|p_n^{0,F,S}\right|$ (n＝1，2，…，W)

Perhaps calculate earlier in the TS0 time slot of F subframe, leading in S in the sign indicating number skew by the width of asking performance number to obtain is the time-delay envelope of W

${\mathrm{SubDP}}_n^{0,F,S}={\left|p_n^{0,F,S}\right|}^2$ (n＝1，2，…，W)

This first time-delay envelope calculator will merge based on leading the time-delay envelope that the sign indicating number skew obtains on the TS0 time slot in all again, and the width that obtains in the TS0 time slot of F subframe is the merging time-delay envelope of W

${\mathrm{DP}}^{0,F}=\left\{{\mathrm{DP}}_k^{0,F}\right\}:$

${\mathrm{DP}}_n^{0,F}=\underset{S\&Element;S}{\mathrm{\&Sigma;}}\mathrm{Sub}{\mathrm{DP}}_n^{0,F,S}$ (n＝1，2，…，W)

Wherein, comprised in the S set and all activatedly on the TS0 time slot led the sign indicating number skew in selected;

At last, the merging time-delay envelope that obtains according to the F subframe of this first time-delay envelope calculator With the average delay envelope

Upgrade, upgrade to handle can be expressed as with formula:

(n＝1，2，…，W)

Wherein, parameter alpha ₀For the real number of span between [0,1], be used to control average weight, α ₀Value more little, then current merging time-delay envelope DP ^{0, F}Weight in average is just big more; AveDP _n ⁰(old) and AveDP _n ⁰(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ⁰Value on the n point; Average delay envelope AveDP ⁰Subscript 0 expression be based on the TS0 time slot in lead the result that yard calculations of offset obtains.

Described first path selector according to the time-delay envelope of the first time-delay envelope calculator output, is determined the Path selection thresholding based on peak-peak and noise power, is used to carry out Path selection, obtains Path selection result 1; Described Path selection result is meant a set that comprises a collection of path position information.

Descending synchronous code processing unit on the described DwPTS comprises second sliding correlation detector that connects successively, the second time-delay envelope calculator and second path selector;

Descending synchronous code sample sequence d={d on described second sliding correlation detector, the descending synchronous code sequence on the DwPTS that is used for the sub-district is used and the DwPTS of corresponding input _kThe correlation computations of sliding, obtain correlated results and be

${\mathrm{<figure-callout\; id="1"\; label="p\; k"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">p</figure-callout>}}_k^{}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{k+i}\&CenterDot;t_i$

Wherein, F represents the residing subframe sequence number of DwPTS, and subscript 1 expression is based on the result that the descending synchronous code on the DwPTS calculates, and N=64 is the length of descending synchronous code part, and the downstream synchronization code word sequence is t={t _k.

Described second sliding correlation detector also can carry out the descending synchronous code sample sequence on the DwPTS of the descending synchronous code sequence on the DwPTS that uses in the sub-district and corresponding input deconvolution and handle, and obtains correlated results and is:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d represents the descending synchronous code sample sequence on the DwPTS, and t represents the downstream synchronization code word sequence, and FFT and IFFT have represented forward and reverse fast fourier transform respectively:

Correlated results p ^{1, F}Can obtain by the data that extract appropriate section among the vectorial p.

The described second time-delay envelope calculator, according to the output of second sliding correlation detector when the front slide correlated results, ask amplitude and average computing, output time-delay envelope:

The described second time-delay envelope calculator calculates among the DwPTS of F subframe earlier, is the time-delay envelope of W by the width of asking range value to obtain

${\mathrm{<figure-callout\; id="1"\; label="DP\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">DP</figure-callout>}}_n^{}=\left|{\mathrm{<figure-callout\; id="1"\; label="p\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">p</figure-callout>}}_n^{}\right|$ (n＝1，2，…，W)

Perhaps calculating earlier among the DwPTS of F subframe, is the time-delay envelope of W by the width of asking performance number to obtain

${\mathrm{<figure-callout\; id="1"\; label="DP\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">DP</figure-callout>}}_n^{}={\left|{\mathrm{<figure-callout\; id="1"\; label="p\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">p</figure-callout>}}_n^{}\right|}^2$ (n＝1，2，…，W)

The merging time-delay envelope that this second time-delay envelope calculator obtains according to the F subframe

With the average delay envelope

Upgrade, this renewal is handled and can be expressed as with formula:

(n＝1，2，…，W)

Wherein, parameter alpha ₁For the real number of span between [0,1], be used to control average weight, this α ₁Value more little, then current merging time-delay envelope DP ^{1, F}Weight in average is just big more; AveDLP _n ¹(old) and AveDP _n ¹(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ¹Value on the n point; Average delay envelope AveDP ¹Subscript 1 expression be based on the result that the descending synchronous code on the DwPTS calculates.

Described second path selector according to the time-delay envelope of the second time-delay envelope calculator output, is determined the Path selection thresholding based on peak-peak and noise power, is used to carry out Path selection, obtains Path selection result 2; Described Path selection result is meant a set that comprises a collection of path position information.

Lead yard processing unit on the described non-TS0 time slot and comprise the 3rd sliding correlation detector that connects successively, the 3rd time-delay envelope calculator and Third Road footpath selector; When network side by on the non-TS0 time slot of signaled user terminal in current subframe, i.e. the last common down channel that needs the user terminal reception that exists of descending time slot TS2～TS6 is led a yard processing unit job on this non-TS0 time slot;

Described the 3rd sliding correlation detector is used for leading a yard sample sequence d={d on the non-TS0 time slot of the skew of leading sign indicating number on the non-TS0 time slot or several skew and corresponding input _kThe relevant treatment of sliding, obtain correlated results and be

$p_k^{2,F,X,S}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{(k+i)\mathrm{mod}N}\&CenterDot;t_i^S$

Wherein, F represents the residing subframe sequence number of TS0 time slot, X represents the sequence number of the descending time slot of this non-TS0 time slot, S represents to lead in selected the sequence number of sign indicating number skew, subscript 2 expression be based on the non-TS0 time slot in lead the result that yard calculations of offset obtains, N=128 leads sign indicating number length partly in being, basic middle guiding code sequence is t={t _k, lead yard offset sequence among its S and be

The 3rd sliding correlation detector, also can with lead on the non-TS0 time slot on the non-TS0 time slot of the skew of sign indicating number or several skew and corresponding input in lead yard sample sequence and carry out the deconvolution processing, export correlated results and be:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d represent on the non-TS0 time slot in lead a yard sample sequence, t represents basic middle guiding code sequence, FFT and IFFT have represented forward and reverse fast fourier transform respectively:

Correlated results p ^{2, F, X, S}Can lead a yard partial data acquisition among the vectorial p in corresponding S by extracting.

Described the 3rd time-delay envelope calculator, according to the output of the 3rd sliding correlation detector when the front slide correlated results, ask amplitude and average computing, obtain the envelope of delaying time:

Described the 3rd time-delay envelope calculator calculates earlier among the time slot X of F subframe, and leading in S in the sign indicating number skew by the width of asking range value to obtain is the time-delay envelope of W

${\mathrm{SubDP}}^{2,F,X,S}=\left\{{\mathrm{SubDP}}_k^{2,F,X,S}\right\}:$

${\mathrm{SubDP}}_n^{2,F,X,S}=\left|p_n^{2,F,X,S}\right|$ (n＝1，2，…，W)

Perhaps calculate earlier among the time slot X of F subframe, leading in S in the sign indicating number skew by the width of asking performance number to obtain is the time-delay envelope of W

${\mathrm{SubDP}}_n^{2,F,X,S}={\left|p_n^{2,F,X,S}\right|}^2$ (n＝1，2，…，W)

Described the 3rd time-delay envelope calculator will merge based on leading the time-delay envelope that the sign indicating number skew obtains on all non-TS0 time slots in all in the F subframe again, obtains the merging time-delay envelope among the non-TS0 of F subframe

${\mathrm{DP}}_n^{2,F}=\underset{X\&Element;X}{\mathrm{\&Sigma;}}\underset{S\&Element;S_X}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{2,F,X,S}$ (n＝1，2，…，W)

Wherein, set X has comprised the non-TS0 time slot that all user terminals use, and S set _XHaving comprised time slot X goes up and leads the sign indicating number skew in all activated.

The merging time-delay envelope that described the 3rd time-delay envelope calculator obtains according to the F subframe at last With the average delay envelope

Upgrade, this renewal is handled and can be expressed as with formula:

(n＝1，2，…，W)

Wherein, parameter alpha ₂For the real number of span between [0,1], be used to control average weight, this α ₂Value more little, then current merging time-delay envelope DP ^{2, F}Weight in average is just big more; AveDP _n ²(old) and AveDP _n ²(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ²Value on the n point; Average delay envelope AveDP ²Subscript 2 expression be based on the non-TS0 time slot in lead the result that yard calculations of offset obtains.

Described Third Road footpath selector according to the time-delay envelope of the 3rd time-delay envelope calculator output, is determined the Path selection thresholding based on peak-peak and noise power, is used to carry out Path selection, obtains Path selection result 3; Described Path selection result is meant a set that comprises a collection of path position information.

Described judgment device comprise respectively with the TS0 time slot in lead a yard processing unit, lead the derailing switch that yard processing unit is connected on the descending synchronous code processing unit on the DwPTS and the non-TS0 time slot, and the cascading judgement device;

Described each derailing switch is selected the Path selection result of respective paths selector output, determines whether this Path selection result imports the cascading judgement device;

Described cascading judgement device, according to one group or several groups of Path selection results by the derailing switch input, carry out cascading judgement, promptly and if only if, and certain paths position is comprised in when Y organizes among the Path selection result at least, think that just this locational path is an active path, wherein, Y is a positive integer, finally exports the active path positional information.

The method for searching path and the device that are used for TD-SCDMA system subscriber terminal equipment realized according to the present invention, has relatively low implementation complexity, and can be under more abominable disturbed condition, particularly exist under the situation of co-channel interference, with than higher probabilistic search active path and avoid selecting wrong path position effectively, thereby can guarantee demodulation, the regularly normal operation of modules such as tracking.

Description of drawings

Fig. 1 is the frame structure schematic diagram of TD-SCDMA system;

Fig. 2 is a kind of existing path selection device figure that is used for user terminal;

Fig. 3 is a kind of schematic diagram that carries out the method for Path selection based on the time-delay envelope;

Fig. 4 carries out the regularly schematic diagram of the method for adjustment for a kind of user terminal based on active path information;

Fig. 5 for obtain by Computer Simulation have co-channel interference the time the example of time-delay envelope; What wherein, Fig. 5 a showed leads the time-delay envelope average that yard calculations of offset obtains, the time-delay envelope average that the descending synchronous code for adopting among the DwPTS that Fig. 5 b shows calculates for adopting on the TS0 first;

Fig. 6 is the installation drawing of the route searching that is applied to the TD-SCDMA system of the present invention's proposition;

Fig. 7 for obtain by Computer Simulation have co-channel interference the time the example of time-delay envelope;

In the path searching apparatus that is applied to the TD-SCDMA system of Fig. 8 for the present invention's proposition, carry out the schematic diagram that cascading judgement is handled;

The method flow diagram that Fig. 9 follows the tracks of for the timing of the TD-SCDMA system that is applied to of the present invention's proposition.

Embodiment

Following according to Fig. 6～Fig. 9, better embodiment of the present invention is described.

As shown in Figure 6, the installation drawing of the route searching that is applied to the TD-SCDMA system that proposes for the present invention.At first, the digital signal samples of reception is carried out matched filtering, filtering out-of-band noise and interference through receiving filter; Then, from filtered digital signal streams, extract respectively by splitter 60: lead the sampling of sign indicating number part during TS0 is last; The sampling of the SYNC-DL code word part on the DwPTS; And on the non-TS0 time slot in lead the sampling of sign indicating number part.

Because the time-delay envelope need calculate current timing point W before _LW afterwards _RCorrelation in the chip width when therefore extracting with the corresponding data sampling of each pilot signal, also needs to be extracted in a little W before _LW afterwards _RData sampling in the chip width.

The device of the route searching of the TD-SCDMA of being applied to provided by the invention system comprises on the TS0 time slot that is connected in parallel leads a yard processing unit, lead a yard processing unit on descending synchronous code processing unit on the DwPTS and the non-TS0 time slot, and the connected judgment device of difference;

Lead yard processing unit on the described TS0 time slot and comprise the first sliding correlation detector 61-1, the first time-delay envelope calculator 62-1 and the first path selector 63-1 that connects successively, be used for according to the sampling of leading the sign indicating number part on the TS0 time slot, calculate corresponding time-delay envelope, and carry out Path selection based on this time-delay envelope.Because each sub-district all can be used and be led sign indicating number and descending synchronous code in one, what user terminal knew that the sub-district uses by Cell searching (Cell Search) is to lead in which yard and descending synchronous code.

During will being gone up by the TS0 that splitter 60 extracts, the described first sliding correlation detector 61-1 leads the sampling d={d of sign indicating number part _k, it is led the sign indicating number skew relevant treatment of sliding respectively with in certain or several, the output correlated results is

$p_k^{0,F,S}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{(k+i)\mathrm{mod}N}\&CenterDot;t_i^S$

Wherein, F represents the residing subframe sequence number of TS0 time slot, and S represents to lead in selected the sequence number of sign indicating number skew, subscript 0 expression be based on the TS0 time slot in lead the result that yard calculations of offset obtains, N=128 leads the length of sign indicating number part in being, basic middle guiding code sequence is t={t _k, lead yard offset sequence among its S and be

Owing to lead the special construction of sign indicating number in the TD-SCDMA system, therefore taked the relevant processing method of circulation slip in the above-mentioned formula.

Lead the sampling of sign indicating number part during the described first sliding correlation detector 61-1 will be gone up by the TS0 that splitter 60 extracts, lead sign indicating number skew carrying out deconvolution and handle respectively with in certain or several, the output correlated results is:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d represents that TS0 leads sign indicating number sampling partly in going up, and t represents basic middle guiding code sequence, and FFT and IFFT have represented forward and reverse fast fourier transform respectively:

Correlated results p ^{0, F, S}Can lead a yard partial data acquisition among the vectorial p in corresponding S by extracting.

The described relevant selection of leading the sign indicating number skew that is used for sliding, can determine as follows:

1, owing on TS0, lead the sign indicating number skew in first and always exist for " beacon " channel (beacon channel) is employed, thus should in to lead the sign indicating number skew always selected; Led in this first sign indicating number skew corresponding the P-CCPCH channel, described P-CCPCH is a kind of common signal channel in the TD-SCDMA system, and exists in the sub-district always;

If 2 systems have adopted sky-sign indicating number transmit diversity techniques, it is also selected then to lead the sign indicating number skew in second; Whether use about sky-sign indicating number transmit diversity techniques, then inform user terminal, perhaps detect voluntarily by user terminal by network side;

If 3, on the TS0 time slot, also have other common signal channels except that P-CCPCH, or dedicated channel, so these channel correspondences in to lead the sign indicating number skew also selected; At this moment, user terminal can according to channel type and/or in lead a yard testing result and judge, lead sign indicating number in selecting to activate.

The described first time-delay envelope calculator 62-1 is according to the correlated results of first sliding correlation detector 61-1 output, calculates according to the following steps based on leading the time-delay envelope that sign indicating number obtains on the TS0:

At first, calculate in the TS0 time slot of F subframe, in S, lead the time-delay envelope by asking range value to obtain in the sign indicating number skew

${\mathrm{SubDP}}_n^{0,F,S}=\left|p_n^{0,F,S}\right|$ (n＝1，2，…，W)

Perhaps also can obtain by asking performance number:

${\mathrm{SubDP}}_n^{0,F,S}={\left|p_n^{0,F,S}\right|}^2$ (n＝1，2，…，W)

Then, will go up based on TS0 and lead the time-delay envelope that the sign indicating number skew obtains in all and merge, obtain the merging time-delay envelope among the TS0 of F subframe

${\mathrm{DP}}_n^{0,F}=\underset{S\&Element;S}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{0,F,S}$ (n＝1，2，…，W)

Wherein, S set has comprised TS0 and goes up and lead the sign indicating number skew in all activated;

At last, the merging time-delay envelope that obtains according to the F subframe

With the average delay envelope

Upgrade, upgrade to handle can be expressed as with formula:

(n＝1，2，…，W)

Wherein, parameter alpha ₀For the real number of span between [0,1], be used to control average weight, this α ₀Value more little, then current merging time-delay envelope DP ^{0, F}Weight in average is just big more; AveDP _n ⁰(old) and AveDP _n ⁰(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ⁰Value on the n point; Average delay envelope AveDP ⁰Subscript 0 expression be based on the TS0 time slot in lead the result that yard calculations of offset obtains.

Carry out leading in a plurality of the merging of time-delay envelope and the averaging in continuous some subframes of sign indicating number skew in a manner described, be in order to utilize received signal information as far as possible, suppress the influence of noise and interference, this time-delay envelope can be followed reflect the actual channel propagation characteristic exactly.In addition, also can more effectively suppress because the influence that decline (fading) brings promptly can not cause amplitude low owing to decline because of certain paths constantly, thereby be leaked choosing.

The described first path selector 63-1 determines the Path selection thresholding according to the time-delay envelope that the first time-delay envelope calculator 62-1 calculates based on peak-peak and noise power, is used to carry out Path selection, obtains Path selection result 1; Described Path selection result is meant a set that comprises a collection of path position information.

Descending synchronous code processing unit on the described DwPTS comprises the second sliding correlation detector 61-2, the second time-delay envelope calculator 62-2 and the second path selector 63-2 that connects successively, be used for sampling according to DwPTS up-downgoing synchronous code part, calculate corresponding time-delay envelope, and carry out Path selection based on this time-delay envelope.

The described second sliding correlation detector 61-2 will be by the sampling d={d of descending synchronous code part among the DwPTS of splitter 60 extractions _k, it is led the sign indicating number skew relevant treatment of sliding respectively with in certain or several, the output correlated results is

${\mathrm{<figure-callout\; id="1"\; label="p\; k"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">p</figure-callout>}}_k^{}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{k+i}\&CenterDot;t_i$

Wherein, F represents the residing subframe sequence number of DwPTS, and subscript 1 expression is based on the result that the descending synchronous code on the DwPTS calculates, and N=64 is the length of descending synchronous code part, and the downstream synchronization code word sequence is t={t _k.

The described second sliding correlation detector 61-2 also can be with the sampling of descending synchronous code part among the DwPTS that is extracted by splitter 60, respectively with the sub-district in the descending synchronous code that uses carry out deconvolution and handle, the output correlated results is:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d represents the sampling of descending synchronous code part among the DwPTS, and t represents the downstream synchronization code word sequence, and FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{1, F}Can obtain by the data that extract appropriate section among the vectorial p.

The described second time-delay envelope calculator 62-2 calculates the time-delay envelope that obtains based on the descending synchronous code on the DwPTS according to the following steps according to second sliding correlation detector 61-2 output correlated results:

At first, in the DwPTS of F subframe, by the time-delay envelope of asking range value to obtain

${\mathrm{<figure-callout\; id="1"\; label="DP"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">DP</figure-callout>}}^{1,F}=\left\{{\mathrm{<figure-callout\; id="1"\; label="DP\; k"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">DP</figure-callout>}}_k^{}\right\}:$

${\mathrm{<figure-callout\; id="1"\; label="DP\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">DP</figure-callout>}}_n^{}=\left|{\mathrm{<figure-callout\; id="1"\; label="p\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">p</figure-callout>}}_n^{}\right|$ (n＝1，2，…，W)

Perhaps also can obtain by asking performance number:

${\mathrm{<figure-callout\; id="1"\; label="DP\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">DP</figure-callout>}}_n^{}={\left|{\mathrm{<figure-callout\; id="1"\; label="p\; n"\; filenames="C2006100251770046H1.png,C2006100251770050H1.png"\; state="\{\{state\}\}">p</figure-callout>}}_n^{}\right|}^2$ (n＝1，2，…，W)

Subsequently, the merging time-delay envelope that obtains according to the F subframe

With the average delay envelope

Upgrade, this renewal is handled and can be expressed as with formula:

(n＝1，2，…，W)

Wherein, parameter alpha ₁For the real number of span between [0,1], be used to control average weight, this α ₁Value more little, then current merging time-delay envelope DP ^{1, F}Weight in average is just big more; AveDP _n ¹(old) and AveDP _n ¹(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ¹Value on the n point; Average delay envelope AveDP ¹Subscript 1 expression be based on the result that the descending synchronous code on the DwPTS calculates.

The time-delay envelope that obtains of the descending synchronous code based among the DwPTS in continuous some subframes averages in a manner described, be in order to utilize received signal information as far as possible, suppress the influence of noise and interference, this time-delay envelope can be followed reflect the actual channel propagation characteristic exactly.

The described second path selector 63-2 determines the Path selection thresholding according to the time-delay envelope that the second time-delay envelope calculator 62-2 calculates based on peak-peak and noise power, is used to carry out Path selection, obtains Path selection result 2; Described Path selection result is meant a set that comprises a collection of path position information.

Lead on the described non-TS0 time slot when yard processing unit requires to have subscriber signal on the descending time slot of certain non-TS0 at least and could work.General, which common down channel network side has exist by the signaled user terminal, needs user terminal constantly to go to receive at some.For example, auxiliary Common Control Channel (S-CCPCH) has comprised paging channel (PCH) and forward access channel (FACH), and user terminal all will remove to receive these common signal channels in paging receiving information or when inserting at random; And for example, in case the special use that the user sets up connects, network side will distribute some dedicated channels (DedicatedChannel) to transmit information such as voice, data for user terminal.

Lead yard processing unit on the described non-TS0 time slot and comprise the 3rd sliding correlation detector 61-3, the 3rd time-delay envelope calculator 62-3 and the Third Road footpath selector 63-3 that connects successively, be used for according to non-TS0 time slot, be on descending time slot TS2～TS6 in lead the sampling of sign indicating number part, calculate corresponding time-delay envelope, and carry out Path selection based on this time-delay envelope.

Described the 3rd sliding correlation detector 61-3 will lead a sign indicating number sampling d={d partly on all non-TS0 time slots of splitter 60 extractions _k, with its certain or several skews of leading sign indicating number respectively with the sub-district in employed relevant treatment of sliding, the output correlated results is

$p_k^{2,F,X,S}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{(k+i)\mathrm{mod}N}\&CenterDot;t_i^S$

Wherein, F represents the residing subframe sequence number of TS0 time slot, X represents the sequence number of the descending time slot of this non-TS0 time slot, S represents to lead in selected the sequence number of sign indicating number skew, subscript 2 expression be based on the non-TS0 time slot in lead the result that yard calculations of offset obtains, N=128 leads sign indicating number length partly in being, basic middle guiding code sequence is t={t _k, lead yard offset sequence among its S and be

Owing to lead the special construction of sign indicating number in the TD-SCDMA system, therefore taked the relevant processing method of circulation slip in the above-mentioned formula.

Described the 3rd sliding correlation detector 61-3 lead the sampling of sign indicating number part in also on all non-TS0 time slots that can be extracted by splitter 60, and certain or several skews of leading sign indicating number respectively with the sub-district in employed are carried out deconvolution and handled, and the output correlated results is:

p＝IFFT(FFT(d)/FFT(t))

Wherein, lead the sampling of sign indicating number part during d represents on the non-TS0 time slot, t represents basic middle guiding code sequence, and FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{2, F, X, S}Can lead a yard partial data acquisition among the vectorial p in corresponding S by extracting.

The described relevant selection of leading the sign indicating number skew that is used for sliding, can determine as follows:

1, for common signal channel or dedicated channel, in some cycle of activity (active period), always have signal to exist, this moment their correspondences in to lead the sign indicating number skew always selected.

For example, for Page Indication Channel (PICH), if it is not dispensed on the TS0, so it on other time slot also always in the sub-district (in certain user's terminal in known time period) exist.

2, if can not determine whether common signal channel or dedicated channel have message transmission in current subframe, then need by in lead code detection method and judge, lead sign indicating number in selected the activation.

Described the 3rd time-delay envelope calculator 62-3 is according to the correlated results of the 3rd sliding correlation detector 61-3 output, calculates according to the following steps based on leading the time-delay envelope that sign indicating number obtains on the non-TS0:

At first, calculate among the time slot X of F subframe, in S, lead the time-delay envelope by asking range value to obtain in the sign indicating number skew

${\mathrm{SubDP}}_n^{2,F,X,S}=\left|p_n^{2,F,X,S}\right|$ (n＝1，2，…，W)

Perhaps also can obtain by asking performance number:

${\mathrm{SubDP}}_n^{2,F,X,S}={\left|p_n^{2,F,X,S}\right|}^2$ (n＝1，2，…，W)

Then, will merge, obtain the merging time-delay envelope among the TS0 of F subframe based on leading the time-delay envelope that the sign indicating number skew obtains on all non-TS0 time slots in all

${\mathrm{DP}}_n^{2,F}=\underset{X\&Element;X}{\mathrm{\&Sigma;}}\underset{S\&Element;S_X}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{2,F,X,S}$ (n＝1，2，…，W)

Wherein, set X has comprised the non-TS0 time slot that all user terminals use, and S set _XHaving comprised time slot X goes up and leads the sign indicating number skew in all activated;

At last, the merging time-delay envelope that obtains according to the F subframe With the average delay envelope

Upgrade, this renewal is handled and can be expressed as with formula:

(n＝1，2，…，W)

Wherein, parameter alpha ₂Be the real number of the scope of getting between [0,1], be used to control average weight: this value is more little, current merging time-delay envelope DP ^{2, F}Weight in average is just big more; AveDP _n ²(old) and AveDP _n ²(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ²Value on the n point; Average delay envelope AveDP ²Subscript 2 expression be based on the non-TS0 time slot in lead the result that yard calculations of offset obtains.

Carry out leading in a plurality of the merging of time-delay envelope and the averaging in continuous some subframes of sign indicating number skew in a manner described, be in order to utilize received signal information as far as possible, suppress the influence of noise and interference, this time-delay envelope can be followed reflect the actual channel propagation characteristic exactly.

Described Third Road footpath selector 63-3 determines the Path selection thresholding according to the time-delay envelope that the 3rd time-delay envelope calculator 62-3 calculates based on peak-peak and noise power, is used to carry out Path selection, obtains Path selection result 2; Described Path selection result is meant a set that comprises a collection of path position information.

Because general employing is omnidirectional antenna on the TS0 time slot, disturb (MAI) but not generally can adopt beam forming (Beamforming) technology to reduce multiple access on each time slot of TS0, so the radiation mode of the antenna of each time slot in every subframe may be different.Like this, the size of the time-delay envelope on every each time slot of subframe may be distinguished to some extent.But, for each time slot, in identical a period of time, propagation path from the base station to the user terminal still is identical, the beam forming technology just at every time slot by the amplitude of adjusting each unit on the aerial array and the size that the phase angle promoted or suppressed every propagation path, so, after merging through multi-slot, the information in actual propagation path also not only can not weakened, and has also obtained reinforcement on the contrary.

Described judgment device comprise respectively with the TS0 time slot in lead a yard processing unit, lead the derailing switch 64 that yard processing unit is connected on the descending synchronous code processing unit on the DwPTS and the non-TS0 time slot, and cascading judgement device 65;

The Path selection result of 64 pairs of respective paths selector outputs of described derailing switch selects, and determines whether this Path selection result imports the cascading judgement device; In fact, user terminal can come the dynamically switching mode of determine switch device 64 based on following factor in each subframe:

1, current more intense interference or the noise of whether existing, if not, lead the Path selection result 1 that sign indicating number obtains in so only going up based on TS0, be the output of path selector 61-3, the perhaps Path selection result 2 who only obtains based on DwPTS up-downgoing synchronous code, the output that is path selector 62-3 is adjudicated, and just can obtain active path information more exactly; Otherwise, then may need to utilize simultaneously the output of path selector 61-3 and 62-3 to send into cascading judgement device 65 and carry out cascading judgement;

2, except TS0 and DwPTS, when user terminal is in connection mode (connected mode), also can utilize simultaneously on the DPCH (DPCH) of non-TS0 time slot and lead the Path selection result 3 that sign indicating number obtains, be the output of path selector 63-3, through after the judgement of follow-up cascading judgement device 65, obtain route searching result more accurately.Because the same frequency that may face on these non-TS0 descending time slots is less, therefore also can overcome the influence that co-channel interference is brought to a certain extent.

When 3, being in regularly tracing mode as if user terminal, then need simultaneously on the TS0 time slot, leading the Path selection result 1 that yard migration processing obtains, handle the Path selection result 2 who obtains based on the descending synchronous code on the DwPTS, and when step 3 is carried out, carry out cascading judgement based on leading the Path selection result 3 that yard migration processing obtains on the DPCH (DPCH) of non-TS0 time slot.

Because regularly tracking module requires very high to route searching result's order of accuarcy, in case it is active path that vicious path position is mistaken for, and cause regularly tracking module to follow the tracks of this mistake path, the just failure that might cause user terminal regularly to follow the tracks of, cause current link failure, and user terminal has to restart once carry out the initial cell synchronizing process; In order to avoid the appearance of this erroneous judgement situation as far as possible,, obtain path court verdict more accurately so need utilize Path selection object information as much as possible to carry out cascading judgement.

Described cascading judgement device 65, according to one group that sends here by derailing switch 64 or some groups of Path selection results, carry out cascading judgement after, obtain active path positional information output; Described cascading judgement, can carry out based on following method: and if only if, and certain paths position is comprised in when Y organizes among the Path selection result at least, thinks that just this position upper pathway is an active path, and wherein Y is a positive integer.Owing to adopted the cascading judgement mode, the situation in erroneous judgement path can effectively be avoided.

Referring to Fig. 7, be depicted as by Computer Simulation obtain have co-channel interference the time the example of time-delay envelope.Simulated conditions is to suppose that the Cell ID of current service cell equals 0; Simultaneously, its Cell ID equals 127 with interfered cell frequently one, and its P-CCPCH/DwPTS power is all than high 3 dB of Serving cell.On the TS0 of Serving cell, use the 1st, 2,7,8,9,13,14 code channels, led the sign indicating number skew in the correspondence the 1st, 4,5,7; And on the TS0 of interfered cell, used the 1st, 2,5,6,7,11,12 code channels, lead the sign indicating number skew in the correspondence the 1st, 3,4,6.And the interfered cell signal reaches user terminal than Zao 10 chips of Serving cell signal.Propagation channel is assumed to be single footpath static environment.Drawn simultaneously among this figure to adopt and led time-delay envelope average (dotting) that yard calculations of offset obtains and the time-delay envelope average (representing) that adopts the descending synchronous code among the DwPTS to calculate on the TS0 time slot first with solid line; Simultaneously, suppose that the Path selection threshold value equaled for 0.25 (as shown in FIG.), also drawn among the figure, cry and mark using under the trigonometric sum three on the respective path peak value respectively based on these two time-delay Path selection results that envelope obtained.Owing to be that propagate in single footpath, so in fact only near the peak value the initial point place is just corresponding real propagation path all is because the erroneous judgement generation that co-channel interference causes and appear at other locational path.

As seen from Figure 7, no matter be to lead sign indicating number during employing TS0 goes up to be offset, also to be based on the descending synchronous code among the DwPTS, the situation appearance of erroneous judgement path position all can be arranged.But, importantly, the situation that erroneous judgement takes place at certain path position the both does not take place under this condition.Therefore, must be the path position that in two groups of Path selection results, all occurs if cascading judgement requires active path, these erroneous judgements just can be avoided so.Since disturb to be since in lead that sign indicating number and descending synchronous code nonideal their cross correlation separately cause, so present state near random distribution, by Probability Principles as can be known, a probability that disturbs certain same position in the cross-correlation function that peak value leads sign indicating number and descending synchronous code in appearing at is simultaneously just compared decline greatly with the probability that occurs respectively.For example, might as well suppose that one is disturbed the probability of certain position in the cross-correlation function that peak value leads sign indicating number and descending synchronous code in appearing to be respectively 0.1 and 0.05, the probability that appears at this position in both cross-correlation function so simultaneously just has only both products, promptly

0.1×0.05＝0.005

On the other hand, the interference that faces on the different time-gap is also different with noise condition, for example on other descending time slot of non-TS0, owing to adopted smart antenna or dynamic channel allocating technology in order, possible its Path selection result is relatively more accurate, like this it is also joined cascading judgement, also can play greatly to reduce and avoid the possibility judged by accident.

As shown in Figure 8, for realizing the processing method schematic diagram of cascading judgement device 65.Here, the cascading judgement device is according to three groups of Path selection results, and promptly Path selection result 1, Path selection result 2, Path selection result 3 adjudicate.Among Fig. 8, comprehensive three groups of path court verdicts, the path position that was occurred marks with the grey dotted line, and carries out the numbering of A～J by the priority sequence of positions.

When carrying out cascading judgement, suppose that parameter Y value equals 2, promptly and if only if when certain paths position is comprised among at least 2 group Path selection results, thinks that just this position upper pathway is an active path.Like this, as shown in Figure 8, three paths are only arranged, three paths that promptly are in position D, E and G are selected as active path, wherein, the path of position D and E all exists in every group of Path selection result, and the path of position G occurs in the 2nd, 3 group of Path selection result.The path of other position only occurs in a certain group of Path selection result at the most, so be not chosen as active path.

As shown in Figure 9, the method flow diagram followed the tracks of of the timing of the TD-SCDMA system that is applied to that proposes for the present invention.At first, in step 90, receive on the TS0 obtain a subframe in lead descending synchronous code partial data sampling on sign indicating number and the DwPTS.Then, in step 91, do the slip relevant treatment with corresponding data sampling, and the descending synchronous code on the DwPTS is done the slip relevant treatment with corresponding data sampling leading the sign indicating number skew among first on the TS0.Then, in step 92,, based on the descending synchronous code of leading among first on the TS0 on sign indicating number skew and the DwPTS, calculate their time-delay envelopes separately respectively based on the slip correlated results.Subsequent, in step 93, carry out Path selection based on the time-delay envelope of the descending synchronous code on the DwPTS, obtain the Path selection result.

Based on this Path selection result, in step 94, judged before current timing point, is there new path to occur? and if the path on the current timing point disappears, in step 95, does judgement have new route to occur behind current timing point? as long as in step 94 or step 95, produce a judgement "Yes", then execution in step 96, show the Path selection result who obtains owing to based on descending synchronous code among the DwPTS, having occurred one " new route " before or after current timing need follow the tracks of, and therefore may need regularly making in advance corresponding or the adjustment of delaying.At this moment, for fear of owing to trace into the catastrophic effect that wrong path causes, also can be in step 96 based on leading the time-delay envelope that the sign indicating number skew obtains on the TS0 in first, carry out Path selection again one time, and judge whether that " new route " that find in step 94 or the step 95 exists equally in this time-delay envelope? if "Yes", then regularly tracking module will be made corresponding timing adjustment according to the appearance position of " new route "; Otherwise think that this " new route " is unreliable, regularly tracking module can not made corresponding timing adjustment yet.

This timing tracking method that adopts the present invention to realize, compare with conventional method, owing to increased so process of " new route " being carried out verification of step 96, can highly effectively avoid owing to follow the tracks of to go up the situation that wrong path causes regularly following the tracks of failure, and reduce disturb or noise to the influence of timing tracking performance.

Those of ordinary skill in the art should recognize, here be used to describe various logical units of the present invention, module, circuit and algorithm steps etc., can adopt electronic hardware (electronic hardware), computer software (computer software) or their combination to put into effect.Here all being to describe according to their function usually to various elements, unit, module, circuit and step, adopting hardware or software during realization actually, is that concrete application and the design constraint by whole system decides.Those of ordinary skill in the art should recognize the interchangeability of hardware and software under specific circumstances, and can adopt best mode to realize the method and apparatus of the described in the invention a kind of TD-SCDMA of being applied to system search of initial zone at concrete application.

For example, here be used to describe various logical units of the present invention, module, circuit and algorithm steps etc., can be in the following ways or their combination realize, comprising: digital signal processor (DSP), special purpose integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, (discrete) gate (gate) or transistor (transistor) logic of separating, the hardware component (for example register and FIFO) that separates, carry out the processor of a series of firmwares (firmware) instruction, traditional programming software (programmable software) and relevant processor (processor) etc.Wherein, processor can be microprocessor (microprocessor), also can be traditional processor, controller (controller), microcontroller (microcontroller) or state machine (state machine) etc.; Software module can be present in RAM memory, flash memory (flash memory), ROM memory, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or any existing known storage medium.

The obviously clear and understanding of those of ordinary skill in the art, the most preferred embodiment that the present invention lifted only in order to explanation the present invention, and is not limited to the present invention, the present invention for the technical characterictic among each embodiment, can combination in any, and do not break away from thought of the present invention.Therefore, all genus are conceived getable method of institute or improvement according to the present invention, all should be included within the interest field of the present invention.Interest field of the present invention is defined by the claims.

Claims (50)

1, the method for the route searching in a kind of TDD-CDMA system is characterised in that, comprises following steps:

Step 1, based on a processing of leading the sign indicating number skew on the TS0 time slot, comprising: the slip correlation computations of step 1.1, the time-delay envelope of step 1.2 calculate and the Path selection of step 1.3, obtain Path selection result 1;

Step 2, based on the processing of the descending synchronous code on the descending pilot frequency time slot, comprising: the slip correlation computations of step 2.1, the time-delay envelope of step 2.2 are calculated and the Path selection of step 2.3, obtain Path selection result 2;

Step 3, if network side by the signaled user terminal on the non-TS0 time slot of current subframe, it is the last common down channel that needs user terminal to receive that exists of descending time slot TS2～TS6, then continue to carry out on the descending time slot of non-TS0 time slot and lead the sign indicating number processing, comprise: the Path selection of the slip correlation computations of step 3.1, the calculating of the time-delay envelope of step 3.2 and step 3.3 obtains Path selection result 3; Otherwise, direct execution in step 4;

Step 4, for the Path selection result 1 that step 1 obtains, the Path selection result 2 that step 2 obtains, and the Path selection result 3 who obtains when step 3 is carried out judge whether whether it needs to carry out cascading judgement, promptly need execution in step 5;

Step 5, cascading judgement: the needs that obtain according to step 4 carry out a group or some groups of Path selection results of cascading judgement, carry out cascading judgement, output active path positional information.

2, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that the slip correlation computations in the described step 1.1 is: in leading on the TS0 time slot on the TS0 time slot of the skew of sign indicating number or several skew and corresponding input, lead a yard sample sequence d={d _kThe correlation computations of sliding, obtain correlated results and be $p^{0,F,S}=\left\{p_k^{0,F,S}\right\}:$

$p_k^{0,F,S}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{(k+1)\mathrm{mod}N}\&CenterDot;t_i^S$

Wherein, F represents the residing subframe sequence number of TS0 time slot, and S represents to lead in selected the sequence number of sign indicating number skew, subscript 0 expression be based on the TS0 time slot in lead the result that yard calculations of offset obtains, N=128 leads the length of sign indicating number part in being, basic middle guiding code sequence is t={t _k, lead yard offset sequence among its S and be $t^S=\left\{t_k^S\right\}.$

3, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, in the described step 1.1, carry out the deconvolution processing with leading yard sample sequence in leading on the TS0 time slot on the TS0 time slot of the skew of sign indicating number or several skew and corresponding input, obtain correlated results and be:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d leads a yard sample sequence in representing on the TS0 time slot, and t represents basic middle guiding code sequence, and FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{0, F, S}Lead a yard partial data acquisition among the vectorial p in corresponding S by extracting.

4, as the method for the route searching in claim 2 or the 3 described TDD-CDMA systems, it is characterized in that, in the step 1.1, the described relevant selected mode of leading the sign indicating number skew that is used for sliding is: lead the sign indicating number skew for beacon channel is employed in first and always exist on the TS0 time slot, lead the certain chosen use of sign indicating number skew in then being somebody's turn to do, led in this first sign indicating number skew corresponding Primary Common Control Physical Channel, described Primary Common Control Physical Channel is a kind of common signal channel in the TDD-CDMA system, and exists in the sub-district always.

5, as the method for the route searching in claim 2 or the 3 described TDD-CDMA systems, it is characterized in that, in the step 1.1, the described relevant selected mode of leading the sign indicating number skew that is used for sliding is: if system adopts sky-sign indicating number transmit diversity techniques, then lead yard being offset a chosen use in second.

Whether 6, the method for the route searching in the TDD-CDMA system as claimed in claim 5 is characterized in that, informs user terminal by network side, perhaps detect described sky-sign indicating number transmit diversity techniques voluntarily by user terminal and adopt.

7, as the method for the route searching in claim 2 or the 3 described TDD-CDMA systems, it is characterized in that, in the step 1.1, the described relevant selected mode of leading the sign indicating number skew that is used for sliding is: if there is other common signal channel except that Primary Common Control Physical Channel on the TS0 time slot, or dedicated channel, then these channel correspondences in lead the chosen use of sign indicating number skew.

8, the method for the route searching in the TDD-CDMA system as claimed in claim 7, it is characterized in that, each common signal channel of described correspondence, or dedicated channel in lead sign indicating number skew by user terminal according to the type of respective channel and/or in lead a yard testing result and be activated selected.

9, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, the time-delay envelope of described step 1.2 calculate be according to step 1.1 output when the front slide correlated results, through after asking amplitude and average treatment, obtain the envelope of delaying time, it comprises following steps:

Step 1.2.1, calculate in the TS0 time slot of F subframe, leading in S in the sign indicating number skew by the width of asking range value to obtain is the time-delay envelope of W ${\mathrm{SubDP}}^{0,F,S}=\left\{{\mathrm{SubDP}}_k^{0,F,S}\right\}:$

${\mathrm{SubDP}}_n^{0,F,S}=\left|p_n^{0,F,S}\right|,(n=\mathrm{1,2},...,W);$

Step 1.2.2, will merge based on leading the time-delay envelope that the sign indicating number skew obtains on the TS0 time slot in all, the width that obtains in the TS0 time slot of F subframe is the merging time-delay envelope of W ${\mathrm{DP}}^{0,F}=\left\{{\mathrm{DP}}_k^{0,F}\right\}:$

${\mathrm{DP}}_n^{0,F}=\underset{S\&Element;S}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{0,F,S},(n=\mathrm{1,2},...,W)$ Wherein, comprised in the S set and all activatedly on the TS0 time slot led the sign indicating number skew in selected;

Step 1.2.3, the merging time-delay envelope that obtains according to the F subframe ${\mathrm{DP}}^{0,F}=\left\{{\mathrm{DP}}_k^{0,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^0=\left\{{\mathrm{AveDP}}_k^0\right\}$ Upgrade:

Wherein, parameter alpha ₀Be the real number of span between [0,1], AveDP _n ⁰(old) and AveDP _n ⁰(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ⁰Value on the n point.

10, the method for the route searching in the TDD-CDMA system as claimed in claim 1 is characterized in that, the time-delay envelope of described step 1.2 calculates and comprises following steps:

Step 1.2.1, calculate in the TS0 time slot of F subframe, leading in S in the sign indicating number skew by the width of asking performance number to obtain is the time-delay envelope of W ${\mathrm{SubDP}}^{0,F,S}=\left\{{\mathrm{SubDP}}_k^{0,F,S}\right\}:$

${\mathrm{SubDP}}_n^{0,F,S}={\left|p_n^{0,F,S}\right|}^2,(n=\mathrm{1,2},...,W)$

Step 1.2.2, will merge based on leading the time-delay envelope that the sign indicating number skew obtains on the TS0 time slot in all, the width that obtains in the TS0 time slot of F subframe is the merging time-delay envelope of W ${\mathrm{DP}}^{0,F}=\left\{{\mathrm{DP}}_k^{0,F}\right\}:$

${\mathrm{DP}}_n^{0,F}=\underset{S\&Element;S}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{0,F,S},(n=\mathrm{1,2},...,W)$

Wherein, comprised in the S set and all activatedly on the TS0 time slot led the sign indicating number skew in selected;

Step 1.2.3, the merging time-delay envelope that obtains according to the F subframe ${\mathrm{DP}}^{0,F}=\left\{{\mathrm{DP}}_k^{0,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^0=\left\{{\mathrm{AveDP}}_k^0\right\}:$ Upgrade:

Wherein, parameter alpha ₀Be the real number of span between [0,1], AveDP _n ⁰(old) and AveDP _n ⁰(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ⁰Value on the n point.

11, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, the Path selection of described step 1.3 is the time-delay envelopes that obtain according to step 1.2, determine the Path selection thresholding based on peak-peak and noise power, carry out Path selection, obtain Path selection result 1.

12, the method for the route searching in the TDD-CDMA system as claimed in claim 11 is characterized in that, in the step 1.3, described Path selection result 1 is meant a set that comprises a collection of path position information.

13, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that the slip correlation computations in the described step 2.1 is: with the descending synchronous code sample sequence d={d on the descending pilot frequency time slot of the descending synchronous code sequence on the descending pilot frequency time slot that uses in the sub-district and corresponding input _kThe correlation computations of sliding, obtain correlated results and be $p^{1,F}=\left\{p_k^{1,F}\right\}:$

$p_k^{1,F}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{k+i}\&CenterDot;t_i$

Wherein, F represents the residing subframe sequence number of descending pilot frequency time slot, and subscript 1 expression is based on the result that the descending synchronous code on the descending pilot frequency time slot calculates, and N=64 is the length of descending synchronous code part, and the downstream synchronization code word sequence is t={t _k.

14, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, slip correlation computations in the described step 2.1 is: the descending synchronous code sample sequence on the descending pilot frequency time slot of the descending synchronous code sequence on the descending pilot frequency time slot that uses in the sub-district and corresponding input is carried out deconvolution handle, obtain correlated results and be:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d represents the descending synchronous code sample sequence on the descending pilot frequency time slot, and t represents the downstream synchronization code word sequence, and FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{1, F}Obtain by the data that extract appropriate section among the vectorial p.

15, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, time-delay envelope in the described step 2.2 calculate be according to step 2.1 output when the front slide correlated results, through after asking amplitude and average treatment, obtain the envelope of delaying time, it comprises following steps:

In the descending pilot frequency time slot of step 2.2.1, calculating F subframe, be the time-delay envelope of W by the width of asking range value to obtain ${\mathrm{DP}}^{1,F}=\left\{{\mathrm{DP}}_k^{1,F}\right\}:$

${\mathrm{DP}}_n^{1,F}=\left|p_n^{1,F}\right|,(n=\mathrm{1,2},...,W)$

Step 2.2.2, the merging time-delay envelope that obtains according to the F subframe ${\mathrm{DP}}^{1,F}=\left\{{\mathrm{DP}}_k^{1,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^1=\left\{{\mathrm{AveDP}}_k^1\right\}$ Upgrade:

Wherein, parameter alpha ₁Be the real number of span between [0,1], AveDP _n ¹(old) and AveDP _n ¹(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ¹Value on the n point.

16, the method for the route searching in the TDD-CDMA system as claimed in claim 1 is characterized in that, the time-delay envelope in the described step 2.2 calculates and comprises following steps:

Among the step 2.2.1, calculate in the descending pilot frequency time slot of F subframe, be the time-delay envelope of W by the width of asking performance number to obtain ${\mathrm{DP}}^{1,F}=\left\{{\mathrm{DP}}_k^{1,F}\right\}:$

${\mathrm{DP}}_n^{1,F}={\left|p_n^{1,F}\right|}^2,(n=\mathrm{1,2},...,W)$

Step 2.2.2, the merging time-delay envelope that obtains according to the F subframe ${\mathrm{DP}}^{1,F}=\left\{{\mathrm{DP}}_k^{1,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^1=\left\{{\mathrm{AveDP}}_k^1\right\}$ Upgrade:

Wherein, parameter alpha ₁Be the real number of span between [0,1], AveDP _n ¹(old) and AveDP _n ¹(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ¹Value on the n point.

17, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, the Path selection of described step 2.3 is the time-delay envelopes that obtain according to step 2.2, determine the Path selection thresholding based on peak-peak and noise power, carry out Path selection, obtain Path selection result 2.

18, the method for the route searching in the TDD-CDMA system as claimed in claim 17 is characterized in that, in the step 2.3, described Path selection result 2 is meant a set that comprises a collection of path position information.

19, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, in the step 3, described common down channel comprises auxiliary Common Control Channel, described auxiliary Common Control Channel comprises paging channel and forward access channel, user terminal will receive described auxiliary Common Control Channel in paging receiving information or when inserting at random.

20, the method for the route searching in the TDD-CDMA system as claimed in claim 19 is characterized in that, when the user set up special-purpose the connection, the network side assigned with dedicated channel was transmitted voice, data message for user terminal.

21, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that the slip correlation computations in the described step 3.1 is: with lead on the non-TS0 time slot on the non-TS0 time slot of the skew of sign indicating number or several skew and corresponding input in lead a yard sample sequence d={d _kThe relevant treatment of sliding, obtain correlated results and be $p^{2,F,X,S}=\left\{p_k^{2,F,X,S}\right\}:$

$p_k^{2,F,X,S}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{(k+i)\mathrm{mod}N}\&CenterDot;t_i^S$

Wherein, F represents the residing subframe sequence number of TS0 time slot, X represents the sequence number of the descending time slot of this non-TS0 time slot, S represents to lead in selected the sequence number of sign indicating number skew, subscript 2 expression be based on the non-TS0 time slot in lead the result that yard calculations of offset obtains, N=128 leads sign indicating number length partly in being, basic middle guiding code sequence is t={t _k, lead yard offset sequence among its S and be $t^S=\left\{t_k^S\right\}.$

22, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, slip correlation computations in the described step 3.1 is: with lead on the non-TS0 time slot on the non-TS0 time slot of the skew of sign indicating number or several skew and corresponding input in lead yard sample sequence and carry out the deconvolution processing, obtain correlated results and be:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d represent on the non-TS0 time slot in lead a yard sample sequence, t represents basic middle guiding code sequence, FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{2, F, X, S}Lead a yard partial data acquisition among the vectorial p in corresponding S by extracting.

23, as the method for the route searching in claim 21 or the 22 described TDD-CDMA systems, it is characterized in that, in the step 3.1, the described relevant selected mode of leading the sign indicating number skew that is used for sliding is: when in the cycle of activity of common signal channel or dedicated channel, always there being signal to exist, this moment corresponding in to lead the sign indicating number skew chosen.

24, as the method for the route searching in claim 21 or the 22 described TDD-CDMA systems, it is characterized in that, in the step 3.1, the described relevant selected mode of leading the sign indicating number skew that is used for sliding is: when can not determine whether common signal channel or dedicated channel have message transmission in current subframe, need by in lead sign indicating number and detect and to judge, lead sign indicating number thereby activate in selected.

25, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, the time-delay envelope of described step 3.2 calculate be according to step 3.1 output when the front slide correlated results, through after asking amplitude and average treatment, obtain the envelope of delaying time, it comprises following steps:

Step 3.2.1, calculate among the time slot X of F subframe, leading in S in the sign indicating number skew by the width of asking range value to obtain is the time-delay envelope of W ${\mathrm{SubDP}}^{2,F,X,S}=\left\{{\mathrm{SubDP}}_k^{2,F,X,S}\right\}:$

${\mathrm{SubDP}}_n^{2,F,X,S}=\left|p_n^{2,F,X,S}\right|,(n=\mathrm{1,2},...,W)$

Step 3.2.2, will merge based on leading the time-delay envelope that the sign indicating number skew obtains on all non-TS0 time slots in all in the F subframe, obtain the merging time-delay envelope among the non-TS0 of F subframe ${\mathrm{DP}}^{2,F}=\left\{{\mathrm{DP}}_k^{2,F}\right\}:$

${\mathrm{DP}}_n^{2,F}=\underset{X\&Element;X}{\mathrm{\&Sigma;}}\underset{S\&Element;S_X}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{2,F,X,S},(n=\mathrm{1,2},...,W)$

Wherein, set X has comprised the non-TS0 time slot that all user terminals use, S set _XHaving comprised time slot X goes up and leads the sign indicating number skew in all activated;

Step 3.2.3, the merging time-delay envelope that obtains according to the F subframe ${\mathrm{DP}}^{2,F}=\left\{{\mathrm{DP}}_k^{2,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^2=\left\{{\mathrm{AveDP}}_k^2\right\}$ Upgrade:

Wherein, parameter alpha ₂Be the real number of span between [0,1], AveDP _n ²(old) and AveDP _n ²(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ²Value on the n point.

26, the method for the route searching in the TDD-CDMA system as claimed in claim 1 is characterized in that, the time-delay envelope of described step 3.2 calculates and comprises following steps:

Step 3.2.1, calculate among the time slot X of F subframe, leading in S in the sign indicating number skew by the width of asking performance number to obtain is the time-delay envelope of W ${\mathrm{SubDP}}^{2,F,X,S}=\left\{{\mathrm{SubDP}}_k^{2,F,X,S}\right\}:$

${\mathrm{SubDP}}_n^{2,F,X,S}={\left|p_n^{2,F,X,S}\right|}^2,(n=\mathrm{1,2},...,W)$

Step 3.2.2, will merge based on leading the time-delay envelope that the sign indicating number skew obtains on all non-TS0 time slots in all in the F subframe, obtain the merging time-delay envelope among the non-TS0 of F subframe ${\mathrm{DP}}^{2,F}=\left\{{\mathrm{DP}}_k^{2,F}\right\}:$

${\mathrm{DP}}_n^{2,F}=\underset{X\&Element;X}{\mathrm{\&Sigma;}}\underset{S\&Element;S_X}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{2,F,X,S},(n=\mathrm{1,2},...,W)$

Wherein, set X has comprised the non-TS0 time slot that all user terminals use, S set _XHaving comprised time slot X goes up and leads the sign indicating number skew in all activated;

Step 3.2.3, the merging time-delay envelope that obtains according to the F subframe ${\mathrm{DP}}^{2,F}=\left\{{\mathrm{DP}}_k^{2,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^2=\left\{{\mathrm{AveDP}}_k^2\right\}$ Upgrade:

Wherein, parameter alpha ₂Be the real number of span between [0,1], AveDP _n ²(old) and AveDP _n ²(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ²Value on the n point.

27, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, the Path selection of described step 3.3 is the time-delay envelopes that obtain according to step 3.2, determine the Path selection thresholding based on peak-peak and noise power, carry out Path selection, obtain Path selection result 3.

28, the method for the route searching in the TDD-CDMA system as claimed in claim 27 is characterized in that, in the step 3.3, described Path selection result 3 is meant a set that comprises a collection of path position information.

29, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, in the step 4, described judgement is respectively organized the method whether the Path selection result can carry out cascading judgement and is: current more intense interference or the noise of whether existing;

If not, then judging only needs step 1 is led the Path selection result 1 that yard migration processing obtains on the TS0 time slot, perhaps only need step 2 is handled Path selection result's 2 execution in step 5 that obtain based on the descending synchronous code on the descending pilot frequency time slot, carry out cascading judgement;

If then judging needs simultaneously step 1 to be led Path selection result 1 and step 2 Path selection result's 2 execution in step 5 that processing obtains based on the descending synchronous code on the descending pilot frequency time slot that yard migration processing obtains on the TS0 time slot, carries out cascading judgement.

30, the method for the route searching in the TDD-CDMA system as claimed in claim 29, it is characterized in that, in the step 4, if user terminal is when being in connection mode, described judgement is respectively organized the method whether the Path selection result can carry out cascading judgement and is: current more intense interference or the noise of whether existing;

If not, then judge to need simultaneously step 1 is led the Path selection result 3 that yard migration processing obtains based on leading Path selection result 1 and the step 3 that yard migration processing obtains on the TS0 time slot on the DPCH of non-TS0 time slot, carry out cascading judgement; Perhaps simultaneously step 2 is handled the Path selection result 2 and the step 3 that obtain based on the descending synchronous code on the descending pilot frequency time slot and on the DPCH of non-TS0 time slot, lead the Path selection result 3 that yard migration processing obtains, carry out cascading judgement;

If, then judging needs simultaneously step 1 to be led the Path selection result 1 that yard migration processing obtains on the TS0 time slot, step 2 is handled the Path selection result 2 and the step 3 that obtain based on the descending synchronous code on the descending pilot frequency time slot and lead the Path selection result 3 that yard migration processing obtains on the DPCH of non-TS0 time slot, carries out cascading judgement.

31, the method of the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, in the step 4, the method whether the Path selection result can carry out cascading judgement is respectively organized in described judgement: if when user terminal is in regularly tracing mode, then need simultaneously step 1 to be led the Path selection result 1 that yard migration processing obtains on the TS0 time slot, step 2 is handled the Path selection result 2 who obtains based on the descending synchronous code on the descending pilot frequency time slot, and when step 3 is carried out, in on the DPCH of non-TS0 time slot, lead the Path selection result 3 that yard migration processing obtains, carry out cascading judgement.

32, the method for the route searching in the TDD-CDMA system as claimed in claim 1, it is characterized in that, in the step 5, the method of described cascading judgement is: and if only if, and certain paths position is comprised in when Y organizes among the Path selection result at least, think that just this locational path is an active path, wherein, Y is a positive integer.

33, the device of the route searching in a kind of TDD-CDMA system, be characterised in that, comprise: on the TS0 time slot that is connected in parallel, lead a yard processing unit, lead a yard processing unit on descending synchronous code processing unit on the descending pilot frequency time slot and the non-TS0 time slot, and the connected judgment device of difference;

Lead yard processing unit on the described TS0 time slot and comprise first sliding correlation detector (61-1) that connects successively, first time-delay envelope calculator (62-1) and first path selector (63-1);

Descending synchronous code processing unit on the described descending pilot frequency time slot comprises second sliding correlation detector (62-1) that connects successively, second time-delay envelope calculator (62-2) and second path selector (62-3);

Lead yard processing unit on the described non-TS0 time slot and comprise the 3rd sliding correlation detector (63-1) that connects successively, the 3rd time-delay envelope calculator (63-2) and Third Road footpath selector (63-3);

Described judgment device comprise respectively with the TS0 time slot in lead a yard processing unit, lead the derailing switch (64) that yard processing unit is connected on the descending synchronous code processing unit on the descending pilot frequency time slot and the non-TS0 time slot, and cascading judgement device (65);

Described derailing switch (64) comprises three switches, respectively with the TS0 time slot in lead on descending synchronous code processing unit and the non-TS0 time slot on a yard processing unit, the descending pilot frequency time slot in lead a yard processing unit and be connected.

34, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described first sliding correlation detector (61-1) is used for leading a yard sample sequence d={d on the TS0 time slot of the skew of leading sign indicating number on the TS0 or several skew and corresponding input _kThe correlation computations of sliding, the output correlated results is $p^{0,F,S}=\left\{p_k^{0,F,S}\right\}:$

$p_k^{0.F,S}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{(k+i)\mathrm{mod}N}\&CenterDot;t_i^S$

Wherein, F represents the residing subframe sequence number of TS0 time slot, S represent a sequence number of leading the sign indicating number skew in fixed far away, subscript 0 expression be based on the TS0 time slot in lead the result that yard calculations of offset obtains, N=128 leads the length of sign indicating number part in being, basic middle guiding code sequence is t={t _k, lead yard offset sequence among its S and be

$t^S=\left\{t_k^S\right\}.$

35, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described first sliding correlation detector (61-1), be used for carrying out the deconvolution processing, export correlated results and be leading yard sample sequence on the TS0 time slot of the skew of leading sign indicating number on the TS0 time slot or several skew and corresponding input:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d leads a yard sample sequence in representing on the TS0 time slot, and t represents basic middle guiding code sequence, and FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{0, F, S}Lead a yard partial data acquisition among the vectorial p in corresponding S by extracting.

36, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, the described first time-delay envelope calculator (62-1), according to first sliding correlation detector (61-1) output when the front slide correlated results, ask amplitude and average computing, output time-delay envelope:

The described first time-delay envelope calculator (62-1) calculates earlier in the TS0 time slot of F subframe, and leading in S in the sign indicating number skew by the width of asking range value to obtain is the time-delay envelope of W

${\mathrm{SubDP}}^{0,F,S}=\left\{{\mathrm{SubDP}}_k^{0,F,S}\right\}:$

${\mathrm{SubDP}}_n^{0,F,S}=\left|p_n^{0,F,S}\right|,(n=\mathrm{1,2},...,W)$

This first time-delay envelope calculator (62-1) will merge based on leading the time-delay envelope that the sign indicating number skew obtains on the TS0 time slot in all again, and the width that obtains in the TS0 time slot of F subframe is the merging time-delay envelope of W ${\mathrm{DP}}^{0,F}=\left\{{\mathrm{DP}}_k^{0,F}\right\}:$

${\mathrm{DP}}_n^{0,F}=\underset{S\&Element;S}{\mathrm{\&Sigma;}}{\mathrm{SUbDP}}_n^{0,F,S},(n=\mathrm{1,2},...,W)$

Wherein, comprised in the S set and all activatedly on the TS0 time slot led the sign indicating number skew in selected;

At last, the merging time-delay envelope that obtains according to the F subframe of this first time-delay envelope calculator (62-1) ${\mathrm{DP}}^{0,F}=\left\{{\mathrm{DP}}_k^{0,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^0=\left\{{\mathrm{AveDP}}_k^0\right\}$ Upgrade:

Wherein, parameter alpha ₀Be the real number of span between [0,1], AveDP _n ⁰(old) and AveDP _n ⁰(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ⁰Value on the n point.

37, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, the described first time-delay envelope calculator (62-1), according to first sliding correlation detector (61-1) output when the front slide correlated results, ask amplitude and average computing, output time-delay envelope:

The described first time-delay envelope calculator (62-1) calculates earlier in the TS0 time slot of F subframe, and leading in S in the sign indicating number skew by the width of asking performance number to obtain is the time-delay envelope of W

${\mathrm{SubDP}}^{0,F,S}=\left\{{\mathrm{SubDP}}_k^{0,F,S}\right\}:$

${\mathrm{SubDP}}_n^{0,F,S}={\left|p_n^{0,F,S}\right|}^2,(n=\mathrm{1,2},...,W)$

This first time-delay envelope calculator (62-1) will merge based on leading the time-delay envelope that the sign indicating number skew obtains on the TS0 time slot in all again, and the width that obtains in the TS0 time slot of F subframe is the merging time-delay envelope of W ${\mathrm{DP}}^{0,F}=\left\{{\mathrm{DP}}_k^{0,F}\right\}:$

${\mathrm{DP}}_n^{0,F}=\underset{S\&Element;S}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{0,F,S},(n=\mathrm{1,2},...,W)$

Wherein, comprised in the S set and all activatedly on the TS0 time slot led the sign indicating number skew in selected;

At last, the merging time-delay envelope that obtains according to the F subframe of this first time-delay envelope calculator (62-1) ${\mathrm{DP}}^{0,F}=\left\{{\mathrm{DP}}_k^{0,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^0=\left\{{\mathrm{AveDP}}_k^0\right\}$ Upgrade:

Wherein, parameter alpha ₀Be the real number of span between [0,1], AveDP _n ⁰(old) and AveDP _n ⁰(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ⁰Value on the n point.

38, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described first path selector (63-1), time-delay envelope according to first time-delay envelope calculator (62-1) output, determine the Path selection thresholding based on peak-peak and noise power, be used to carry out Path selection, obtain Path selection result 1, promptly comprise the set of a collection of path position information.

39, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, descending synchronous code sample sequence d={d on described second sliding correlation detector (61-2), the descending synchronous code sequence on the descending pilot frequency time slot that is used for the sub-district is used and the descending pilot frequency time slot of corresponding input _kThe correlation computations of sliding, the output correlated results is $p^{1,F}=\left\{p_k^{1,F}\right\}:$

$p_k^{1,F}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{k+i}\&CenterDot;t_i$

Wherein, F represents the residing subframe sequence number of descending pilot frequency time slot, and subscript 1 expression is based on the result that the descending synchronous code on the descending pilot frequency time slot calculates, and N=64 is the length of descending synchronous code part, and the downstream synchronization code word sequence is t={t _k.

40, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described second sliding correlation detector (61-2), descending synchronous code sequence on the descending pilot frequency time slot that is used for the sub-district is used is carried out deconvolution with descending synchronous code sample sequence on the descending pilot frequency time slot of corresponding input and is handled, and the output correlated results is:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d represents the descending synchronous code sample sequence on the descending pilot frequency time slot, and t represents the downstream synchronization code word sequence, and FFT and IFFT have represented forward and reverse fast fourier transform respectively, subsequently, and p ^{1, F}Can obtain by the data that extract appropriate section among the vectorial p.

41, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, the described second time-delay envelope calculator (62-2), according to second sliding correlation detector (61-2) output when the front slide correlated results, ask amplitude and average computing, output time-delay envelope:

The described second time-delay envelope calculator (62-2) calculates in the descending pilot frequency time slot of F subframe earlier, is the time-delay envelope of W by the width of asking range value to obtain ${\mathrm{DP}}^{1,F}=\left\{{\mathrm{DP}}_k^{1,F}\right\}:$

${\mathrm{DP}}_n^{1,F}=\left|p_n^{1,F}\right|,(n=1,2,...,W)$

The merging time-delay envelope that this second time-delay envelope calculator (62-2) obtains according to the F subframe again ${\mathrm{DP}}^{1,F}=\left\{{\mathrm{DP}}_k^{1,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^1=\left\{{\mathrm{AveDP}}_k^1\right\}$ Upgrade:

Wherein, parameter alpha ₁Be the real number of span between [0,1], AveDP _n ¹(old) and AveDP _n ¹(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ¹Value on the n point.

42, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, the described second time-delay envelope calculator (62-2), according to second sliding correlation detector (61-2) output when the front slide correlated results, ask amplitude and average computing, output time-delay envelope:

The described second time-delay envelope calculator (62-2) calculates in the descending pilot frequency time slot of F subframe earlier, is the time-delay envelope of W by the width of asking performance number to obtain ${\mathrm{DP}}^{1,F}=\left\{{\mathrm{DP}}_k^{1,F}\right\}:$

${\mathrm{DP}}_n^{1,F}=|p_n^{1,F}{|}^2,(n=1,2,...,W)$

The merging time-delay envelope that this second time-delay envelope calculator (62-2) obtains according to the F subframe again ${\mathrm{DP}}^{1,F}=\left\{{\mathrm{DP}}_k^{1,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^1=\left\{{\mathrm{AveDP}}_k^1\right\}$ Upgrade:

Wherein, parameter alpha ₁Be the real number of span between [0,1], AveDP _n ¹(old) and AveDP _n ¹(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ¹Value on the n point.

43, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described second path selector (63-2), time-delay envelope according to second time-delay envelope calculator (62-2) output, determine the Path selection thresholding based on peak-peak and noise power, be used to carry out Path selection, obtain Path selection result 2, promptly comprise the set of a collection of path position information.

44, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described the 3rd sliding correlation detector (61-3) is used for leading a yard sample sequence d={d on the non-TS0 time slot of the skew of leading sign indicating number on the non-TS0 time slot or several skew and corresponding input _kThe relevant treatment of sliding, the output correlated results is $p^{2,F,X,S}=\left\{p_k^{2,F,X,S}\right\}:$

$p_k^{2,F,X,S}=\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{d}_{(k+i)\mathrm{mod}N}\&CenterDot;t_i^S$

Wherein, F represents the residing subframe sequence number of TS0 time slot, X represents the sequence number of the descending time slot of this non-TS0 time slot, S represents to lead in selected the sequence number of sign indicating number skew, subscript 2 expression be based on the non-TS0 time slot in lead the result that yard calculations of offset obtains, N=128 leads sign indicating number length partly in being, basic middle guiding code sequence is t={t _k, lead yard offset sequence among its S and be $t^S=\left\{t_k^S\right\}.$

45, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described the 3rd sliding correlation detector (61-3), be used for carrying out the deconvolution processing, export correlated results and be leading yard sample sequence on the non-TS0 time slot of the skew of leading sign indicating number on the non-TS0 time slot or several skew and corresponding input:

p＝IFFT(FFT(d)/FFT(t))

Wherein, d represent on the non-TS0 time slot in lead a yard sample sequence, t represents basic middle guiding code sequence, FFT and IFFT have represented forward and reverse fast fourier transform respectively;

Correlated results p ^{2, F, X, S}Lead a yard partial data acquisition among the vectorial p in corresponding S by extracting.

46, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described the 3rd time-delay envelope calculator (62-3), according to the 3rd sliding correlation detector (61-3) output when the front slide correlated results, ask amplitude and average computing, obtain the envelope of delaying time:

Described the 3rd time-delay envelope calculates (62-3) device and calculates earlier among the time slot X of F subframe, and leading in S in the sign indicating number skew by the width of asking range value to obtain is the time-delay envelope of W

${\mathrm{SubDP}}^{2,F,X,S}=\left\{{\mathrm{SubDP}}_k^{2,F,X,S}\right\}:$

${\mathrm{SubDP}}_n^{2,F,X,S}=\left|p_n^{2,F,X,S}\right|,(n=\mathrm{1,2},...,W)$

Described the 3rd time-delay envelope calculator (62-3) will merge based on leading the time-delay envelope that the sign indicating number skew obtains on all non-TS0 time slots in all in the F subframe again, obtains the merging time-delay envelope among the non-TS0 of F subframe ${\mathrm{DP}}^{2,F}=\left\{{\mathrm{DP}}_k^{2,F}\right\}:$

${\mathrm{DP}}_n^{2,F}=\underset{X\&Element;X}{\mathrm{\&Sigma;}}\underset{S\&Element;S_X}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{2,F,X,S},(n=\mathrm{1,2},...,W)$

Wherein, set X has comprised the non-TS0 time slot that all user terminals use, and S set _XHaving comprised time slot X goes up and leads the sign indicating number skew in all activated

The merging time-delay envelope that described the 3rd time-delay envelope calculator (62-3) obtains according to the F subframe at last ${\mathrm{DP}}^{2,F}=\left\{{\mathrm{DP}}_k^{2,F}\right\}$ With the average delay envelope ${\mathrm{AveDP}}^2=\left\{{\mathrm{AveDP}}_k^2\right\}$ Upgrade:

Wherein, parameter alpha ₂Be the real number of span between [0,1], AveDP _n ²(old) and AveDP _n ²(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ²Value on the n point.

47, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described the 3rd time-delay envelope calculator (62-3), according to the 3rd sliding correlation detector (61-3) output when the front slide correlated results, ask amplitude and average computing, obtain the envelope of delaying time:

Described the 3rd time-delay envelope calculates (62-3) device and calculates earlier among the time slot X of F subframe, and leading in S in the sign indicating number skew by the width of asking performance number to obtain is the time-delay envelope of W

${\mathrm{SubDP}}^{2,F,X,S}=\left\{{\mathrm{SubDP}}_k^{2,F,X,S}\right\}:$

${\mathrm{SubDP}}_n^{2,F,X,S}={\left|p_n^{2,F,X,S}\right|}^2,(n=\mathrm{1,2},...,W)$

Described the 3rd time-delay envelope calculator (62-3) will merge based on leading the time-delay envelope that the sign indicating number skew obtains on all non-TS0 time slots in all in the F subframe again, obtains the merging time-delay envelope among the non-TS0 of F subframe ${\mathrm{DP}}^{2,F}=\left\{{\mathrm{DP}}_k^{2,F}\right\}:$

${\mathrm{DP}}_n^{2,F}=\underset{X\&Element;X}{\mathrm{\&Sigma;}}\underset{S\&Element;S_X}{\mathrm{\&Sigma;}}{\mathrm{SubDP}}_n^{2,F,X,S},(n,\mathrm{1,2},...,W)$

Wherein, set X has comprised the non-TS0 time slot that all user terminals use, and S set _XHaving comprised time slot X goes up and leads the sign indicating number skew in all activated;

The merging time-delay envelope that described the 3rd time-delay envelope calculator (62-3) obtains according to the F subframe at last ${\mathrm{DP}}^{2,F}=\left\{{\mathrm{DP}}_k^{2,F}\right\},$ With the average delay envelope ${\mathrm{AveDP}}^2=\left\{{\mathrm{AveDP}}_k^2\right\}$ Upgrade:

Wherein, parameter alpha ₂Be the real number of span between [0,1], AveDP _n ²(old) and AveDP _n ²(newly) represents to upgrade forward and backward average delay envelope AveDP respectively ²Value on the n point.

48, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described Third Road footpath selector (63-3), time-delay envelope according to the 3rd time-delay envelope calculator (62-3) output, determine the Path selection thresholding based on peak-peak and noise power, be used to carry out Path selection, obtain Path selection result 3, promptly comprise the set of a collection of path position information.

49, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described derailing switch (64) is selected the Path selection result of respective paths selector output, determines whether this Path selection result imports cascading judgement device (65).

50, the device of the route searching in the TDD-CDMA system as claimed in claim 33, it is characterized in that, described cascading judgement device (65), one group or several groups of Path selection results according to by derailing switch (64) input carry out cascading judgement, and promptly and if only if, and certain paths position is comprised in when Y organizes among the Path selection result at least, think that just this locational path is an active path, wherein, Y is a positive integer, finally exports the active path positional information.

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