CN102347783A - Device and method for performing synchronous detection in time division duplex (TDD) system and terminal equipment - Google Patents

Abstract

The invention discloses a device for performing synchronous detection in a system based on a time division duplex (TDD) mode. The device comprises a normalization unit and a synchronous detection unit, wherein the normalization unit is configured for normalizing a sampling point sequence for the synchronous detection in a signal which is received by terminal equipment required to perform the synchronous detection to make each sampling point in the sampling point sequence normalized based on parameters, which are relevant to amplitude, of all sampling points in a preset range around the sampling point; and the synchronous detection unit is configured for performing the synchronous detection in response to the normalized sampling point sequence which is output by the normalization unit. The invention also provides a method for performing the synchronous detection in the system based on the TDD mode. By normalizing the sampling points for the synchronous detection based on factors, which are relevant to power, of all sampling points in the preset range around the sampling points, and performing the synchronous detection by using the normalized sampling points, the interference of an uplink signal in the synchronous detection can be restrained, and detection time can be reduced.

Description

In tdd systems, carry out device, method and the terminal equipment of synchronous detecting

Technical field

The technical field that present invention relates in general to communicate by letter particularly relates to and in the communication system based on TDD (time division duplex) pattern, carries out device, the method for synchronous detecting and the terminal equipment that comprises this device.

Background technology

In the 3GPP long evolving system (Long term evaluation, LTE), exist TDD mode (Time Division Duplex, TDD) and mode of frequency division duplexing (Frequency DivisionDuplex, FDD).In the mode of frequency division duplexing wherein, uplink and downlink signals is in different frequency transmission.And the uplink and downlink signals of TDD mode transmits in the different time section of same carrier frequency.

In the TDD-LTE of TDD mode system, the standard code of 3GPP the configurations of seven kinds of frame structures, tabulate shown in 1 as follows.With " D " sign descending sub frame, " U " identifies sub-frame of uplink in the table 1, and " S " identifies special subframe.Each subframe lengths is 1ms, is made up of the time slot (slot) that two length are 0.5ms.

Fig. 1 has provided the tdd frame structure of half subframe, in the special subframe wherein, has descending time slot DwPTS, and up-downgoing conversion interval GP and ascending time slot UpPTS form.Main synchronizing symbol (Primary synchronization symbol; PSS) be arranged in #1 and #6 subframe (at unshowned other field); (Secondary synchronization symbol SSS) is arranged in #0 and #5 subframe (at unshowned other field) to auxilliary synchronizing symbol.As shown in fig. 1, PSS is positioned at the 3rd symbol of DwPTS, and SSS is positioned at last symbol of #0 subframe.In communication system based on TDD; Terminal equipment detects the time synchronized and the Frequency Synchronization that can obtain with proper cell through carrying out PSS, and, on the basis that PSS detects; Can obtain frame timing and sub-district ID through further carrying out the SSS detection, realize Cell searching thus.

Table 1 TDD uplink-downlink configuration

According to the 3GPP standard code, the PSS signal is that length is 62 Zadoff-Chu sequence, has three, shown in 1:

$c_{n_{\mathrm{ZC}}}\left(k\right)=\left\{\begin{array}{c}\exp \{-\mathrm{j\π}{n}_{\mathrm{ZC}}\frac{k(k+1)}{63}\},k=\mathrm{0,1},\·\·\·,30\\ \exp \{-\mathrm{j\π}{n}_{\mathrm{ZC}}\frac{(k+1)(k+2)}{63}\},k=\mathrm{31,32},\·\·\·61\end{array}\right.$ (formula 1)

Wherein, n _ZCGet 25,29, one of 34}.

Figure 2 shows a schematic diagram of the sequence, as shown in the sequence around the center of the DC sub-carrier 31, corresponding to DC sub-carrier?

set to zero.The same zero setting of five number of sub-carrier on sequence both sides.Totally 72 number of sub-carrier are for six RB (resource block, Resource Block) at center.PSS sequence at subframe #1 and subframe #6 is identical.

The detection method based on matched filtering is usually adopted in the detection of PSS symbol, is not knowing under the situation regularly, and the time of 5ms at least of need searching for detects the position of PSS symbol.

The SSS symbol is interwoven by the m sequence of two length 31, has 168 sequences, shown in 2.Equally with PSS occupy six RB that carrier wave is the center, each the 5 number of sub-carrier zero setting of sequence both sides, as shown in Figure 3.Different is that the SSS sequence that is positioned at subframe #0 and subframe #5 is different.

$d\left(2k\right)=\left\{\begin{array}{c}{s}_0^{m_0}\left(k\right)c_0\left(k\right),\mathrm{in\; subframe}0\\ s_1^{m_0}\left(k\right)c_0\left(k\right),\mathrm{in\; <figure-callout\; id="5"\; label="subframe"\; filenames="HSA00000215916100111.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="subframe"\; filenames="HSA00000215916100012.png,HSA00000215916100021.png"\; state="\{\{state\}\}">subframe</figure-callout>\; </figure-callout>}5\end{array}\right.,0\&le;k\&le;30$

$d(2k+1)=\left\{\begin{array}{c}{s}_1^{m_1}\left(k\right)c_1\left(k\right)z_1^{m_0}\left(k\right),\mathrm{in\; subframe}0\\ s_0^{m_0}\left(k\right)c_1\left(k\right)z_1^{m_1}\left(k\right),\mathrm{in\; <figure-callout\; id="5"\; label="subframe"\; filenames="HSA00000215916100111.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="subframe"\; filenames="HSA00000215916100012.png,HSA00000215916100021.png"\; state="\{\{state\}\}">subframe</figure-callout>\; </figure-callout>}5\end{array}\right.,0\&le;k\&le;30$ (formula 2)

The concrete generating mode of above-mentioned each sequence can not given unnecessary details referring to relevant criterion 3GPP 36.211 here.

The SSS detection mode normally detects based on the sign indicating number sequences match at frequency domain.In addition, under CP (cyclicprefix, Cyclic Prefix) type condition of unknown, possibly utilize SSS to come the type of blind Detecting CP.

For describing for simplicity, hereinafter the combination that PSS detects and PSS detects and SSS detects is called " synchronous detecting ".Synchronous detecting for example can be used for terminal equipment and carries out and the time of base station and the synchronous or realization cell search process of frequency.From the kind of Cell searching, mainly contain search of initial zone and neighboring cell search.Search of initial zone is used for initial network and inserts, and its objective is the synchronous of terminal equipment and target BS settling time and frequency, and then terminal equipment detects the best sub-district ID of signal and realizes network insertion.Neighboring cell search comprises that neighbor cell is selected and switch the sub-district.In neighboring cell search, terminal equipment need be searched for the signal strength signal intensity of setting up synchronously and detect neighbor cell ID and neighbor cell with neighbor cell.

Fig. 4 has provided the example that in TDD-LTE system terminal equipment carries out synchronous detecting, supposes that terminal equipment UE1 is used for the synchronous detecting that initial network inserts (for example when UE1 starts shooting) in this example.Usually, terminal equipment UE1 is not when obtaining timing information, and need searching at least, the time of field obtains frame regularly.As stated; In the TDD-LTE system, because uplink and downlink signals works in same frequency, thereby terminal equipment UE1 can receive the descending (Downlink from base station (eNodeB) in the time of a frame; DL) signal and from up (Uplink, UL) signal of adjacent end equipment UE 2 and UE3.Because the decline of wireless channel, terminal equipment UE1 receive from the downstream signal of base station eNodeB maybe be very a little less than, such as when terminal equipment is positioned at cell edge.On the contrary, often there is the direct projection path in neighboring terminals equipment UE 2 with the terminal equipment UE1 that carries out synchronous detecting with UE3, because close together, the upward signal that terminal equipment UE1 receives possibly exceed tens dB than downstream signal, as shown in Figure 5.At this moment Chang Yong synchronization signal detection algorithm can receive the influence of uplink interference and lose efficacy.The SSS detection need be used the testing result information that detects from PSS, and therefore, above-mentioned this adverse effect all exists in PSS detection and/or SSS detection, correspondingly, also can influence the performance based on the cell search process of PSS detection and SSS detection.In addition, also it may be noted that possibly constitute different that the quantity of the terminal equipment of adverse effect maybe be with shown in Fig. 4 to the terminal equipment UE1 that carries out synchronous detecting, for example be one or greater than two, but existing problem is similar.

Thus it is clear that, how to realize remaining problem demanding prompt solution based on the synchronous detecting that can effectively suppress the interference of upward signal in the system of tdd mode.

Summary of the invention

Provided hereinafter about brief overview of the present invention, so that the basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is confirmed key of the present invention or pith, neither be intended to limit scope of the present invention.Its purpose only is to provide some notion with the form of simplifying, with this as the preorder in greater detail of argumentation after a while.

In view of the problem that exists in the above-mentioned prior art; According to sync detection device and the method that embodiments of the invention provided; In synchronous detecting based on the system of tdd mode; To be used for the sampling point of synchronous detecting and by normalization (normalization), carry out synchronous detecting with normalized sampling point then based on the parameter relevant (the for example mean value that relevant statistic perhaps is correlated with amplitude with amplitude) of all sampling points of preset range around it with amplitude.

Provide a kind of being used for to comprise according to embodiments of the invention at the device of carrying out synchronous detecting based on the communication system of tdd mode:

The normalization unit; It is configured to carrying out normalization process by the sampling point sequence that is used for synchronous detecting in the signal that terminal equipment received that will carry out synchronous detecting, so that each sampling point is based on the parameter relevant with amplitude of all sampling points in the preset range around this sampling point and by regular in the said sampling point sequence; And

Synchronous detection unit, it is configured to carry out synchronous detecting in response to the normalized sampling point sequence of process of said regular unit output.

Provide a kind of being used for to comprise according to another embodiment of the invention in the method for carrying out synchronous detecting based on the communication system of tdd mode:

To carrying out normalization process by the sampling point sequence that is used for synchronous detecting in the signal that terminal equipment received that will carry out synchronous detecting; So that for each sampling point in the said sampling point sequence, this sampling point is carried out normalization based on the parameter relevant of all sampling points in the preset range around this sampling point with amplitude; And

Carry out synchronous detecting according to the described normalized sampling point sequence of process of carrying out the generating step of normalization process.

A kind of program product that stores the instruction code of machine-readable is provided again according to other embodiments of the invention, when said instruction code is read and carried out by machine, can have carried out like above-mentioned synchronization detecting method.

Also relate to a kind of storage medium that carries above-mentioned program product according to other embodiments of the invention.

Carry out synchronous detecting through utilizing according to the apparatus and method of each embodiment of the invention described above, can obtain one of benefit and be to have suppressed the interference of upward signal in the synchronous detecting of TDD-LTD system, to improve the synchronous detecting performance.Obtainable other benefit is to reduce the synchronous detecting time.

Description of drawings

With reference to below in conjunction with the explanation of accompanying drawing, can understand above and other purpose, characteristics and advantage of the present invention to the embodiment of the invention with being more prone to.Parts in the accompanying drawing are not proportional draftings, and just for principle of the present invention is shown.For the ease of illustrating and describe some parts of the present invention, counterpart possibly be exaggerated in the accompanying drawing, that is, make it become bigger with respect to other parts in the exemplary means of the actual manufacturing according to the present invention.In the accompanying drawings, identical or similar techniques characteristic or parts will adopt identical or similar Reference numeral to represent.

Fig. 1 shows in the TDD-LTE system, by the sketch map of the tdd frame configuration frame of the field of certain frame structure configuration of 3GPP standard code;

Fig. 2 is the sketch map that constitutes that illustrates by the PSS sequence of 3GPP standard code;

Fig. 3 is the sketch map that constitutes that illustrates by the SSS sequence of 3GPP standard code;

Fig. 4 shows the sketch map that in TDD-LTE system terminal equipment UE1 is used for the synchronous detecting that initial network inserts;

Fig. 5 shows the sketch map of in synchronous detecting as shown in Figure 4, receiving from the adverse effect of the upward signal of adjacent end equipment;

Fig. 6 shows the structure diagram that is used for carrying out in the TDD-LTD system device of synchronous detecting according to an embodiment of the invention;

The structure diagram of the embodiment that Fig. 7 shows in the regular unit that sync detection device shown in Figure 6 comprises;

Fig. 8 shows the sketch map that normalization process is realized in the regular unit that comprises in the sync detection device according to an embodiment of the invention;

Fig. 9 shows the sketch map of the performed BORDER PROCESSING in regular unit in the sync detection device according to an embodiment of the invention;

Figure 10 is the sketch map of formation that the interval GAP that is used for alien-frequency district search of 3GPP standard code is shown;

Figure 11 shows the structure diagram of a kind of variations of sync detection device according to an embodiment of the invention shown in Figure 6;

Figure 12 shows the structure diagram of another kind of variations of the synchronous detection unit of sync detection device according to an embodiment of the invention shown in Figure 6;

Figure 13 shows the structure diagram of another variations of the synchronous detection unit of sync detection device according to an embodiment of the invention shown in Figure 6;

Figure 14 shows the general flow chart that is used for carrying out in the TDD-LTD system method of synchronous detecting according to an embodiment of the invention;

Figure 15 shows the structure diagram of an embodiment of the normalization process step that comprises at synchronization detecting method shown in Figure 14;

Figure 16 A-16B shows respectively and utilizes traditional method and sync detection device and the method utilized according to the embodiment of the invention, the comparative illustration figure of the TDD signal that terminal equipment is received; Figure 16 C-16D shows respectively and utilizes traditional method and utilize according to the sync detection device of the embodiment of the invention and the obtainable synchronous detecting result's of method comparative illustration figure;

Figure 16 E shows the comparison diagram of the probability of false detection of utilizing the PSS that traditional method and sync detection device and the method utilized according to the embodiment of the invention obtain; And

Figure 17 shows the structure diagram that can be used to realize according to the general-purpose computing system of the sync detection device of the embodiment of the invention and method.

Embodiment

Embodiments of the invention are described with reference to the accompanying drawings.Element of in an accompanying drawing of the present invention or a kind of execution mode, describing and characteristic can combine with element and the characteristic shown in one or more other accompanying drawing or the execution mode.Should be noted that for purpose clearly, omitted the parts that have nothing to do with the present invention, those of ordinary skills are known and the expression and the description of processing in accompanying drawing and the explanation.

Fig. 6 shows the structure diagram that is used for carrying out in the TDD-LTD system device 600 of synchronous detecting according to an embodiment of the invention.As shown in the figure, the device 600 of synchronous detecting comprises regular unit 610 and synchronous detection unit 620.Normalization unit 610 is configured to carrying out normalization process by the sampling point sequence that is used for synchronous detecting in the signal that terminal equipment received that will carry out synchronous detecting, so that each sampling point is based on the parameter relevant with amplitude of all sampling points in the preset range around this sampling point and by regular in the sampling point sequence.Synchronous detection unit 620 is configured to carry out synchronous detecting based on the normalized sampling point sequence of process of regular unit 610 outputs.

As mentioned above; What exist in traditional synchronization detecting method is relevant by the amplitude of interference that upward signal caused and signal or power level etc.; The factor relevant with amplitude or power of all sampling points carried out in the specific region around having considered to stand the sampling point of normalization process just and according to the performed normalization of the sync detection device of this embodiment of the invention; So can eliminate or weaken at least significantly near of the negative effect of the upward signal of the other-end equipment the terminal device that carries out synchronous detecting effectively to the synchronous detecting that this terminal device carried out; For example; It is disconnected to reduce erroneous judgement, improves synchronous detecting precision etc.Figure 16 A-16B of back has provided an examples of simulation, shows to utilize traditional method and sync detection device and the method utilized according to the embodiment of the invention, the comparative illustration figure of the TDD signal that terminal equipment is received.Shown in Figure 16 A, the TDD signal that the terminal receives comprises descending (DL) signal from the base station, and the noise signal in the GP is from up (UL) signal of other UE.About the high 40dB of upward signal power ratio downstream signal power wherein, can see that signal shows the characteristic of non-stationary signal.Through according to after the normalization process in the embodiment of the invention, shown in Figure 16 B, signal has become does not have the strong waveform that rises and falls, steady many.Particularly exceed a lot of uplink interference and be suppressed than descending.

The structure diagram of the embodiment 700 that Fig. 7 shows in the regular unit that sync detection device shown in Figure 6 600 comprises.As shown in the figure; Regular unit 700 according to this embodiment comprises: normalization factor computation subunit 720; It is configured to each sampling point in the sampling point sequence; Calculate the statistical value that mean value all sampling points, relevant with amplitude perhaps is correlated with amplitude in the preset range around this sampling point, and with this mean value or statistical value as the normalization factor corresponding with this sampling point; Postpone subelement 710, it was configured to the corresponding time of the part of the time span of sampling point sequence delays and this preset range; And normalizer unit 730; It is configured to each sampling point in the sampling point sequence; Will be from postponing subelement 710 delay sampling points output, corresponding with this sampling point; Divided by the normalization factor corresponding, so that this sampling point is by normalization with this sampling point from said normalization factor computation subunit 720 outputs.

Be elaborated through of the operation of an object lesson below to this normalization unit.

In synchronous detecting is handled; Six RB (resource block in corresponding carrier wave center the signal that will receive from the antenna of terminal equipment; Resource Block) time-domain signal r (m; K) as the sampling point that is used to carry out synchronous detecting; This sampling point is the signal with real part and imaginary part; Wherein m is corresponding to the signal from m reception antenna, and k is the sequence number of sampling point.A plurality of this sampling points have constituted the sampling point sequence that is used for synchronous detecting.

In normalization factor computing unit 720, for example the sampling point r that calculates and import through following formula (m, k) relevant normalization factor N (m, k):

$N(m,k)=\frac{1}{W_{\mathrm{norm}}}\underset{l=-W_{\mathrm{norm}}/2}{\overset{l=W_{\mathrm{norm}}/2-1}{\mathrm{\&Sigma;}}}\left(\right|\mathrm{Re}\left(r(m,k+l)\right)|+\left|\mathrm{Im}\left(r(m,k+l)\right)\right|)$ (formula 3)

In above-mentioned formula (3), W _NormThe length of representing regular window.At this, " regular window " be above mentioned, (m k) carries out an example of the related preset range of normalization process, and this preset range is the scope (comprising this sampling point) around the sampling point that stands normalization process to sampling point r.Sampling points all in this normalization window (comprise that sampling point r (m, k)) will participate in the processing that above-mentioned formula (3) provides.The length of normalization window is integer, the value between desirable 2～256, for example 2,4,8,16,64,128, the arbitrary value among the 256}.Preferably, for example can get arbitrary value in 8～128.The length performance that for example can reach according to the parameter and the needs of communication system of normalization window (for example the time of the Cell searching that is used for of synchronous detecting etc.) is confirmed through means such as l-G simulation tests.Detail repeats no more at this.

Can find out; The processing of above-mentioned formula (3); That considers when embodying the range value information of same of sampling point to realize is easy comprehensively; Be actually real part mould that adopts each sampling point in the regular window and the mode that imaginary part mould sum is averaged and calculate corresponding and input sample r (m; Normalization factor N k) (m, k).

Postponing subelement 710, the signal sampling point that receives is for example postponed W _Norm/ 2 sampling point times, and the sampling point r that obtains postponing (m, k) _DelayThe purpose of doing like this is to carry out normalization in order to realize with center normalization window.Promptly (m, k), its normalization factor is based on the preceding W of this sampling point for receiving signal sampling point r _Norm/ 2 sampling points W behind this sampling point _Norm(information (for example the real part mould of sampling point, imaginary part mould etc.) that comprises this sampling point r (m, k)) calculates/2 sampling points.

In normalizer unit 730, through delayed sampling point r (m, k) _DelayAnd normalization factor N corresponding with it (m, k), carry out normalization through following formula:

$r_{\mathrm{norm}}(m,k)=\frac{r{(m,k)}_{\mathrm{delay}}}{N(m,k)}$ (formula 4)

The above-mentioned example that center normalization window is realized normalization process that passes through has been shown among Fig. 8.As stated, in this normalization process, postpone, make that the normalization output corresponding with this sampling point is exported from the middle part of regular window rather than from the rightmost side of this window standing normalized sampling point.That is, avoided taking the cause and effect window.If adopt the cause and effect window, then (m, the sampling point of k) receiving before are used to confirm that (promptly, regular output should be from the rightmost side output of this window for m, the k) normalization of correspondence output with sampling point r at a certain sampling point r in this window.As shown in Figure 8; If the rightmost side of regular window is in GP and up (UL) signal boundary; Then because all or part of interval that is in GP of regular window possibility; Make and calculate a very little normalization factor through above-mentioned formula (3); This will cause the large-signal r (m on GP and upward signal border; K) make the phenomenon of signal error amplification divided by little normalization factor, thereby influence the precision of synchronous detecting unfriendly.

In the example shown in Fig. 8, what regular window adopted is center normalization window,, stands sampling point r (m, the center output of the regular window from this center of normalization output k) of normalization process that is.As can also using various suitable eccentric regular windows to calculate normalization factor, as follows for selecting embodiment:

$N(m,k)=\frac{1}{W_{\mathrm{norm}}}\underset{l=-W_{\mathrm{norm}}/4}{\overset{l={3W}_{\mathrm{norm}}/4-1}{\mathrm{\&Sigma;}}}\left|\mathrm{Re}\left(r(m,k+l)\right)\right|+\left|\mathrm{Im}\left(r(m,k+l)\right)\right|$ (formula 5)

$N(m,k)=\frac{1}{W_{\mathrm{norm}}}\underset{l=-{3W}_{\mathrm{norm}}/4}{\overset{l=W_{\mathrm{norm}}/4-1}{\mathrm{\&Sigma;}}}\left|\mathrm{Re}\left(r(m,k+l)\right)\right|+\left|\mathrm{Im}\left(r(m,k+l)\right)\right|$ (formula 6)

Above-mentioned formula (5) and (6) are to adopt the regular window Far Left side W of distance respectively _Norm/ 4 and 3W _NormThe configuration of normalization factor is calculated in the configuration of/4 eccentric regular window, that is, stand the normalization of the sampling point of normalization process and export respectively from the regular window Far Left side W of distance _Norm/ 4 and 3W _NormThe output of/4 parts.Correspondingly, under both of these case, the signal sampling point that receives is postponed W respectively at delay subelement 710 _Norm/ 4 and 3W _Norm/ 4 sampling point times.That is to say, postpone the corresponding time of a part of the time span of sampling point sequence delays that subelement will be used for synchronous detecting and regular window.

In the above-described embodiments, through being asked, the real part mould of all sampling points in the regular window and imaginary part mould sum on average calculate normalization factor.Because it is consistent with the imaginary part statistical property to receive the real part of signal, select embodiment as replacing, the real part mould mean value that normalization factor also can be through all sampling points in the regular window or the mean value of imaginary part mould wait tries to achieve, as follows:

$N(m,k)=\frac{1}{W_{\mathrm{norm}}}\underset{l=-W_{\mathrm{norm}}/2}{\overset{l=W_{\mathrm{norm}}/2-1}{\mathrm{\&Sigma;}}}\left(\right|\mathrm{Re}\left(r(m,k+l)\right)|)$ (formula 7)

$N(m,k)=\frac{1}{W_{\mathrm{norm}}}\underset{l=-W_{\mathrm{norm}}/2}{\overset{l=W_{\mathrm{norm}}/2-1}{\mathrm{\&Sigma;}}}\left(\right|\mathrm{Im}\left(r(m,k+l)\right)\left|\right)$ (formula 8)

Above-mentioned formula (7) is to try to achieve normalization factor through the real part mould mean value of all sampling points in the regular window, and formula (8) is to try to achieve normalization factor through the imaginary part mould mean value of all sampling points in the regular window.The mean value of the mean value of the real part mould of sampling point, the mean value of imaginary part mould or both sums all is amplitude or the relevant mean value of power with sampling point.But the invention is not restricted to this; But it will also be appreciated that employing calculates normalization factor based on any other suitable parameters value of the amplitude of sampling point; For example adopt sampling point any other suitable statistic relevant with amplitude or power; The first-order statistics amount of sampling point mould value for example: mean value, maximum etc.; Or high-order statistic such as average power etc., carry out the calculating of normalization factor.In addition, above-mentioned formula (7) and (8) are with the configuration of center normalization window, understand easily, and the account form of this normalization factor can be applied to the configuration of eccentric regular window too.

Because the sampling point to pending normalization process has carried out above-mentioned delay processing, the feasible precision that can further improve synchronous detecting.

Can be according to one for selecting embodiment, normalization factor computation subunit 720 can also comprise BORDER PROCESSING parts (not shown).Fig. 9 shows the sketch map of an example of the performed BORDER PROCESSING in regular unit in the sync detection device according to an embodiment of the invention.

In this example, suppose regular window W _NormLength be 8, and for ease of explanation, the configuration of normalization window at this use center.Arabic numerals " 1 ", " 2 " ... the sequence number of the sampling point of the pending normalization process of " 9 " expression.In the regular window 902 shown in Fig. 9 a, postponing W _NormFirst normalization output of beginning behind/2 sampling points, the corresponding sampling point r (1) that is received.That is, several the 4th sampling point positions provide the normalization output of sampling point r (1) from these normalization window 902 left sides.Can see; Because the sampling point sequence gets into from the left side of regular window 902 successively; Then at the initial period of the normalization process shown in Fig. 9 a; In the time will carrying out normalization process to first sampling point r (1); Normalization window 902 is not also filled up by sampling point; That is, the right of this normalization window 902 is empty.In this case,, just can improve the speed of normalization process, and then make synchronous detecting handle speed-raising if fill up this normalization window 902 with suitable sampling point.

Particularly, the BORDER PROCESSING parts can be configured to initial period in normalization process based on the sampling point that stands normalization process continuation forward, that is, from this sampling point direction forward, utilize this sampling point to fill up by the normalization window.For example, shown in Fig. 9 b, 4 sampling points in current sampling point r (1) continuation to its place ahead of standing normalization process to constitute 8 sampling points in the regular window 902, are directed against the normalization process of sampling point r (1) then based on this regular window that fills up.Shown in Fig. 9 c, correspondence meets the sampling point r (2) that stands normalization process, with three sampling points in r (2) continuation to its place ahead.By that analogy; Up to regular result's output (shown in Fig. 9 e) of corresponding the 4th sampling point r (4), then corresponding with initial period BORDER PROCESSING is accomplished, and can get into common normalization process (processing that for example above-mentioned formula (3)-(8) provide); Like Fig. 9 f, shown in the 9g.In the example shown in Fig. 9, the initial period of normalization process is: first sampling point is carried out no longer there is the time period between the white space that need be filled by pending sampling point in normalization process up to regular window during from beginning.Certainly, according to actual needs, can select the initial period of other suitable time periods as normalization process.

Though in the above example, use the sampling point that stands normalization process to come regular window 902 is filled at the initial period of normalization process,, can also can adopt fixed value to come this normalization window 902 is filled for selecting embodiment according to one.For example, can adopt and carry out this continuation forward with half corresponding value of A-D converter range and fill.

Similarly, in the ending phase (not shown among Fig. 9) of normalization process, get into owing to no longer include new pending sampling point, the left side of the regular window 902 shown in Fig. 9 sampling point ground one by one becomes empty.For this reason, the BORDER PROCESSING parts can be configured to the latter end in normalization process, based on the sampling point that stands normalization process continuation backward, that is, and from this sampling point direction backward, utilize this sampling point to fill up by the normalization window.In like manner, can also can adopt other suitable values for selecting embodiment according to one, for example carry out this continuation backward and fill with half corresponding value of A-D converter range.Understand easily, the employed fixed value of the filling here can to fill employed fixed value identical or different with the initial period of above-mentioned normalization process.In addition, in the example shown in Fig. 9, the ending phase of normalization process is: during beginning to occur white space to the last a sampling point is accomplished the time period till the normalization process from regular window Far Left side.Certainly, according to actual needs, can select the ending phase of other suitable time periods as normalization process.

Test shows, when the regular window that is adopted was big, it is long-time that this boundary processing method can be saved half window at least, therefore improved the speed of synchronous detecting.

In addition, according to the regulation of 3GPP standard, for the neighboring cell search of alien frequencies, need in GAP (the alien frequencies neighboring cell search is interval), accomplish, and the time of GAP has only 6ms, terminal equipment will be accomplished conversion and the synchronization signal detection and the measurement of carrier frequency during this.In asynchronous network, accomplishing Cell searching needs 5ms at least.Detect for the SSS that carries out coherent detection based on detected PSS signal; In order to guarantee that the channel estimating of SSS in detecting is based on (with reference to the tdd frame structure as Fig. 1 shown in) that the PSS at three symbol places at interval obtains, the completion alien-frequency district search needs the time of 5ms+4 symbol (symbol).Figure 10 is the sketch map of formation that the interval GAP that is used for alien-frequency district search of 3GPP standard code is shown.VCO representes voltage controlled oscillator among Figure 10, carries out the conversion of carrier frequency when being used between Serving cell and neighbor cell, switching.The time of using high performance VCO certainly to make the carrier frequency conversion use is short as far as possible, but this high-performance VCO is relatively more expensive.For fear of using expensive voltage controlled oscillator, consider two symbols of main synchronizing symbol (PSS) and auxilliary synchronizing symbol (SSS) interval in the TDD-LTE system simultaneously, need to make the synchronous detecting time that be used for alien-frequency district search to shorten as far as possible.For this reason, in the synchronous detecting of alien-frequency district search, use above-mentioned boundary processing method especially to have value.For example, particularly in long compare big of the window of regular window, such as 128 sampling points, boundary processing method according to the above embodiment of the present invention can reduce the long time of a window altogether at regular starting and ending place.

Following formula (9) and (10) have provided a kind of implementation of the normalization factor calculating that comprises above-mentioned BORDER PROCESSING:

$N(m,k)=\frac{1}{W_{\mathrm{norm}}}\underset{l=-W_{\mathrm{norm}}/2}{\overset{l=W_{\mathrm{norm}}/2-1}{\mathrm{\&Sigma;}}}\left|\mathrm{Re}\left(D(m,k,l)\right)\right|+\left|\mathrm{Im}\left(D(m,k,l)\right)\right|$ (formula 9)

(Equation 10)

Wherein, T _NormBe the Cell searching relevant (for example can be the initial synchronisation search, also can be neighboring cell search etc.) corresponding sampling point length of time with synchronous detecting.The included detection performance that PSS detects and/or SSS detects to confirm in advance during this parameter for example can detect according to system synchronization.For example, sampling point length that can be corresponding with durations such as 5ms+4symbol, 5ms+2symbol according to the actual conditions employing.

Come regular window is carried out forward or during backward continuation, can be provided the implementation of the normalization factor calculating that comprises above-mentioned BORDER PROCESSING by following formula (11) and (12) when adopting fixed value (that is, constant):

$N(m,k)=\frac{1}{W_{\mathrm{norm}}}\underset{l=-W_{\mathrm{norm}}/2}{\overset{l=W_{\mathrm{norm}}/2-1}{\mathrm{\&Sigma;}}}\left|\mathrm{Re}\left(D(m,k,l)\right)\right|+\left|\mathrm{Im}\left(D(m,k,l)\right)\right|$ (formula 11)

(Equation 12)

Understand easily; Though above-mentioned formula (9)-(12) are to have utilized the real part mould of corresponding sampling point and the mean value of imaginary part mould sum to calculate the normalization factor corresponding with sampling point, equally also can utilize with modes such as such real part mould mean value that passes through corresponding sampling point in above-mentioned formula (7) or (8) or imaginary part mould mean values and carry out this normalization process that comprises BORDER PROCESSING.Detail is given unnecessary details at this no longer one by one.

Figure 11 shows the structure diagram of a kind of variations that includes control unit of sync detection device according to an embodiment of the invention shown in Figure 6.As shown in the figure; Compare with the synchronous detection unit 600 shown in Fig. 6 according to the sync detection device 1100 of this variations; Difference is also to comprise control unit 1102; It can be according to the residing different Cell searching stage of terminal equipment, and the control sync detection device is carried out normalization process by different patterns.Particularly:

When the initial access communication system of terminal equipment, start shooting again after for example initially power on start or the shutdown etc., need carry out search of initial zone.In the case, normalization process is carried out in the regular unit 1104 of control unit 1102 controls always, detects up to synchronous detection unit 1106 till the ID of the Serving cell that service can be provided for said terminal equipment.

Switch when needs carry out the sub-district, for example move to the edge of current service cell and cause when quality-degraded at terminal equipment, the Current Serving BTS indicating terminal equipment of terminal equipment carries out neighboring cell search.If serving BS indicating terminal equipment carries out the homogeneous frequency adjacent area search; Then because 3GPP regulation co-frequency cell is synchronous, so carry out normalization process in the scope of regular unit 1104 of control unit 1102 control about the synchronizing signal of Serving cell 2 or 2.5 sub-frame.For example, according to the tdd frame structural arrangements that provides among above-mentioned Fig. 1, can control regular unit 1104 between based on the subframe #0 of the timing of Serving cell and subframe #1 or carry out normalization process between subframe #5 and the subframe #6.This time for example can be confirmed according to the base station synchronization precision (by the 3GPP standard code) and the propagation delay of related cell radius.Details is described at this no longer one by one.

If serving BS indicating terminal equipment carries out the alien frequencies neighboring cell search, then carry out normalization process in the interval GAP of the regular unit 1104 of control unit 1102 controls each alien frequencies neighboring cell search between upward signal and downstream signal.For example in system based on tdd mode, consider the difference of SSS detection algorithm, the time of can regular unit carrying out normalization process for example is set to the time optional in the scope of 5ms+1symbols-5ms+4symbols.Wherein 5ms+4symbols is the value of comparative optimization.

Owing to can control the executive mode of normalization process according to actual conditions; The time interval of for example aforesaid its execution of qualification; Therefore can be when obtaining the synchronous detecting performance improvement; Can also make the declines such as power cost relevant with synchronous detecting; For example, the terminal equipment that has utilized this sync detection device to carry out synchronous detecting can be realized the performance boost of aspects such as power and energy saving.

Among Figure 11 in the sync detection device 1100 configuration of regular unit 1102 and synchronous detection unit 1106 and operational example as can be referring to above-mentioned description, description no longer one by one to Fig. 6-7.

Figure 12 shows the structure diagram of another kind of variations of the synchronous detection unit of sync detection device according to an embodiment of the invention shown in Figure 6.As shown in figure 12, comprise PSS detection sub-unit 1212, the signal r after it is configured to adopt three possible PSS sequences (as shown in Figure 2) respectively and passes through normalization process according to the detecting unit 1204 in the sync detection device 1200 of this variations _Norm(m k) carries out related operation, and in the synchronous detecting scope, detects the maximum of correlation or be higher than the correlation institute corresponding PSS sequence (PSS ID) and the corresponding timing position (SSS regularly) of certain threshold value.In addition, can also be through the frequency shift (FS) of PSS Sequence Detection terminal and base station.The configuration of regular unit 1202 and operational example are as can describe referring to above-mentioned description to Fig. 6-7 no longer one by one in the sync detection device 1200.

Figure 13 shows the structure diagram of another variations of the synchronous detection unit of sync detection device according to an embodiment of the invention shown in Figure 6.As shown in figure 13, comprise PSS detection sub-unit 1312 and SSS detection sub-unit 1316 according to the detecting unit 1304 in the sync detection device 1300 of this variations.PSS detection sub-unit 1312 for example can be carried out and PSS detection sub-unit 1212 similar function and the operations shown in above-mentioned Figure 12.The timing position that SSS detection sub-unit 1316 comprises in can the testing result based on PSS detection sub-unit 1312 according to expansion CP (Cyclic Prefix) and the normal length of CP, is known the position of FFT by inference and is converted the signal into frequency domain and detect respectively respectively.Finally can compare the size of two position maximum correlation peak and judge it is expansion CP or normal CP.Consider that when detecting the CP type synchronous detecting is handled the influence that also possibly receive the interference of GP and upward signal and caused detecting performance decrease, thereby also will pass through the signal r after regular unit 1302 is handled in this embodiment _Norm(m, k) input SSS detection sub-unit detects.SSS detects and can adopt based on the coherence detection of PSS signal or based on the incoherent detection method of difference.After the coherent detection, can obtain the Cell ID (sub-district ID) of adjacent base station.The configuration of regular unit 1302 and operational example are as can describe referring to above-mentioned description to Fig. 6-7 no longer one by one in the sync detection device 1300.

As stated, owing to the normalization process with performance of improvement can be used to carry out PSS and/or SSS synchronous detecting, therefore further also can strengthen the ability of the Cell searching of terminal equipment.

Figure 14 show according to another embodiment of the invention, be used at the general flow chart that carries out the method 1400 of synchronous detecting based on the communication system of tdd mode.As shown in the figure, method 1400 starts from step S1410.At step S1420; To carrying out normalization process by the sampling point sequence that is used for synchronous detecting in the signal that terminal equipment received that will carry out synchronous detecting; So that for each sampling point in this sampling point sequence, this sampling point is carried out normalization based on the parameter relevant of all sampling points in the preset range around this sampling point with amplitude.At step S1430, carry out synchronous detecting according to the normalized sampling point sequence of process that step S1420 produces.For example, can carry out this method through utilizing the sync detection device 600 shown in above-mentioned Fig. 6.Concrete operations and obtainable benefit thereof for example can be referring to top descriptions to Fig. 6, and details repeats no more at this.

Figure 15 shows the general flow chart at the embodiment of the included step S1420 that carries out normalization process of synchronization detecting method shown in Figure 14.As shown in the figure, the synchronization detecting method 1500 according to this embodiment comprises step S1520 that carries out normalization process and the step S1530 that carries out synchronous detecting.Wherein step S1520 comprises three sub-steps.At substep S1522; To each sampling point in the sampling point sequence; Calculate the statistical value that mean value all sampling points, relevant with amplitude perhaps is correlated with amplitude in the said preset range around this sampling point, and with this mean value or statistical value as the normalization factor corresponding with this sampling point.At substep S1526, with the corresponding time of a part of the time span of sampling point sequence delays and preset range.At substep S1528, to each sampling point in the sampling point sequence, will be from substep S1526 output, corresponding delay sampling point with this sampling point, divided by from S1522 substep normalization factor that export, corresponding with this sampling point, so that this sampling point is by normalization.For example, can carry out this method through utilizing the sync detection device 700 shown in above-mentioned Fig. 7.Concrete operations and obtainable benefit thereof for example can be referring to top descriptions to Fig. 7, and details repeats no more at this.

Should be noted that at this; Though being used for shown in the figure the substep S1526 that sampling point carries out the substep S1522 of normalization process and is used for that the sampling point sequence is delayed time is to carry out according to the order that figure provides; But this two sub-steps also can be carried out concurrently or carry out substep S1522 behind the execution substep S1526 earlier.

An embodiment according to this method 1500; The substep S1522 that calculates normalization factor comprises to each sampling point in the sampling point sequence, calculates one of at least the normalization factor corresponding with this sampling point in real part mould mean value, imaginary part mould mean value and the real part mould through all sampling points in the preset range around this sampling point and the mean value of imaginary part mould sum.For example, can carry out this method through utilizing the sync detection device 700 shown in above-mentioned Fig. 7.Concrete operations and obtainable benefit thereof for example can be referring to top descriptions to Fig. 7, and details repeats no more at this.

Can be according to another of this method 1500 for selecting embodiment, the substep S1522 that calculates normalization factor may be embodied as at the initial period of normalization process and carries out the BORDER PROCESSING of continuation forward and carry out the BORDER PROCESSING of the BORDER PROCESSING of continuation backward at the initial period of normalization process.For example, can carry out this method through utilizing the sync detection device 700 shown in above-mentioned Fig. 7.Concrete operations and obtainable benefit thereof for example can be referring to top descriptions to Fig. 7-10, and details repeats no more at this.

Can be according to method 1400 and 1500 one for selecting embodiment; Can also comprise controlled step; Be used for carrying out under the situation of search of initial zone, homogeneous frequency adjacent area search and alien frequencies neighboring cell search at terminal equipment, the different normalization process of step execution of normalization process is carried out in control respectively.For example, can carry out this method through utilizing the sync detection device 1100 shown in above-mentioned Figure 11.Concrete operations and obtainable benefit thereof for example can be referring to top descriptions to Figure 11, and details repeats no more at this.

One according to method 1400 and 1500 can also comprise the substep that is used to carry out the PSS synchronous detecting for selecting embodiment, perhaps comprises being used to carry out the substep of PSS synchronous detecting and being used to carry out SSS synchronous detecting substep.For example, can carry out this method through utilizing the sync detection device 1200 and 1300 shown in above-mentioned Figure 12-13.Concrete operations and obtainable benefit thereof for example can be referring to top descriptions to Figure 12 and 13, and details repeats no more at this.

The sync detection device of above-mentioned each embodiment for example can be realized through the mode of software, hardware, firmware or their combination in any according to the present invention.When this sync detection device takes hardware mode to realize, can take appearance attitudes such as integrated circuit (IC) chip, card of surfing Internet, USB-bar.

Understand easily, the sync detection device of above-mentioned each embodiment can be used as discrete functional entity and realizes according to the present invention, also can integrate with corresponding terminal device and realize.Therefore, be equipped with the terminal equipment of this sync detection device also should covered within protection scope of the present invention.This terminal equipment for example can comprise mobile phone, palmtop computer, kneetop computer etc.

Though above-mentioned explanation is in the context environmental of TDD-LTE system, to carry out; But; The sync detection device of above-mentioned each embodiment, method and portable terminal are not only applicable to the TDD-LTE system according to the present invention; Equally also has adoptive IMT-Advanced system, like TD-LTE Advanced system etc. applicable to following and LTE system.

Figure 16 A-16B shows respectively and utilizes traditional synchronization detecting method and utilize according to the sync detection device of the embodiment of the invention and the obtainable synchronous detecting result's of method comparative illustration figure.In traditional synchronous detecting, adopt do not pass through normalization process reception sampling point signal r (n) directly with the PSS sequence carry out relevant, that is:

$C\left(\mathrm{id}\right)={\left|\underset{n}{\overset{T_{\mathrm{symbol}}}{\mathrm{\&Sigma;}}}{r}^{*}\left(n\right)\mathrm{PSS}(\mathrm{id},n)\right|}^2$ (formula 13)

Wherein, id representes 3 known arrays of the PSS shown in above-mentioned Fig. 2, T _SymbolRepresent pairing number of samples in the symbol lengths, n representes the sequence number of sampling point, and " * " representes conjugate operation.

In sync detection device and method, adopt through the sampling point signal r after the normalization process according to various embodiments of the present invention _N(n) with the PSS sequence carry out relevant, that is:

$C\left(\mathrm{id}\right)={\left|\underset{n}{\overset{T_{\mathrm{symbol}}}{\mathrm{\&Sigma;}}}{r_N}^{*}\left(n\right)\mathrm{PSS}(\mathrm{id},n)\right|}^2$ (formula 14)

Contrast according to Figure 16 C and 16D is visible, when the uplink interference signal is very big, in the conventional synchronization detection method; The maximum of correlation appears at ascender (UL); This is wrong timing, because correct timing (that is correct relevant peaks) should be in corresponding part with PSS.In sync detection device and method according to various embodiments of the present invention, relevant peaks appears at correct timing position (that is correct relevant peaks).This shows that the performance of synchronous detecting has obtained remarkable improvement.

In addition, the present inventor has carried out emulation to awgn channel under the condition of the high 10dB of uplink interference power ratio descending power, the probability of false detection of test PSS.The result of l-G simulation test provides in Figure 16 E.Shown in Figure 16 E, in traditional method of not using normalization process, the probability of false detection of PSS is about 66%, and does not descend with the signal to noise ratio rising, and synchronous detecting algorithm complete failure is described.On the contrary, adopted under the situation according to the sync detection device of the embodiment of the invention and method, along with the rising false drop rate of signal to noise ratio reduces to zero.

Describe in detail through block diagram, flow chart and/or embodiment above, illustrated the different execution modes of devices in accordance with embodiments of the present invention and/or method.When these block diagrams, flow chart and/or embodiment comprise one or more functions and/or operation; It will be obvious to those skilled in the art that among these block diagrams, flow chart and/or the embodiment each function and/or operation can through various hardware, software, firmware or in fact they combination in any and individually and/or enforcement jointly.In one embodiment, the several sections of the theme of describing in this specification can pass through application-specific IC (ASIC), field programmable gate array (FPGA), digital signal processor (DSP) or other integrated form realizations.Yet; Those skilled in the art will recognize that; Some aspects of the execution mode of describing in this specification can be whole or in part in integrated circuit with the form of one or more computer programs of on one or more computers, moving (for example; Form with one or more computer programs of on one or more computer systems, moving); With the form of one or more programs of on one or more processors, moving (for example; Form with one or more programs of on one or more microprocessors, moving); Form with firmware; Or implement equivalently with the form of their combination in any in fact; And; According to disclosed content in this specification, being designed for circuit of the present disclosure and/or writing the code that is used for software of the present disclosure and/or firmware is fully within those skilled in the art's limit of power.

For example, above-mentioned Fig. 6-7, each is formed module, unit, subelement and can be configured through the mode of software, firmware, hardware or its combination in any in the sync detection device shown in the 11-13.Under situation about realizing through software or firmware; Can the program that constitute this software be installed to the computer with specialized hardware structure (general-purpose computations 1700 for example shown in Figure 17) from storage medium or network; This computer can be carried out various functions when various program is installed.

Figure 17 shows the structure diagram that can be used to realize according to the general-purpose computing system of the sync detection device of the embodiment of the invention and method.Computer system 1700 is an example just, is not that hint is to the scope of application of method and apparatus of the present invention or the limitation of function.Computer system 1700 should be interpreted as yet the arbitrary assembly shown in the exemplary operation system 1700 or its combination are had dependence or demand.

In Figure 17, CPU (CPU) 1701 carries out various processing according to program stored among read-only memory (ROM) 1702 or from the program that storage area 1708 is loaded into random-access memory (ram) 1703.In RAM 1703, also store data required when CPU 1701 carries out various processing or the like as required.CPU 1701, ROM 1702 and RAM 1703 are connected to each other via bus 1704.Input/output interface 1705 also is connected to bus 1704.

Following parts also are connected to input/output interface 1705: importation 1706 (comprising keyboard, mouse or the like), output 1707 (comprise display; For example cathode ray tube (CRT), LCD (LCD) etc. and loud speaker etc.), storage area 1708 (comprising hard disk etc.), communications portion 1709 (comprising network interface unit for example LAN card, modulator-demodulator etc.).Communications portion 1709 is via for example internet executive communication processing of network.As required, driver 1710 also can be connected to input/output interface 1705.Detachable media 1711 for example disk, CD, magneto optical disk, semiconductor memory or the like can be installed on the driver 1710 as required, makes the computer program of therefrom reading to be installed to as required in the storage area 1708.

Realizing through software under the situation of above-mentioned series of processes, can from network for example the internet or from storage medium for example detachable media 1711 program that constitutes softwares is installed.

It will be understood by those of skill in the art that this storage medium is not limited to shown in Figure 17 wherein having program stored therein, distribute so that the detachable media 1711 of program to be provided to the user with equipment with being separated.The example of detachable media 1711 comprises disk (comprising floppy disk), CD (comprising compact disc read-only memory (CD-ROM) and digital universal disc (DVD)), magneto optical disk (comprising mini-disk (MD) (registered trade mark)) and semiconductor memory.Perhaps, storage medium can be hard disk that comprises in ROM 1702, the storage area 1708 or the like, computer program stored wherein, and be distributed to the user with the equipment that comprises them.

Therefore, the invention allows for a kind of program product that stores the instruction code of machine-readable.When said instruction code is read and carried out by machine, can carry out the above-mentioned method of in based on the communication system of tdd mode, carrying out synchronous detecting according to the embodiment of the invention.Correspondingly, the above-named various storage mediums that are used for carrying this program product are also included within of the present invention open.

In the above in the description to the specific embodiment of the invention; Characteristic to a kind of execution mode is described and/or illustrated can be used in one or more other execution mode with identical or similar mode; Combined with the characteristic in other execution mode, or substitute the characteristic in other execution mode.

Should stress that term " comprises/comprise " existence that when this paper uses, refers to characteristic, key element, step or assembly, but not get rid of the existence of one or more further feature, key element, step or assembly or additional.The term " first " that relates to ordinal number; The enforcement order or the importance degree of characteristic, key element, step or assembly that " second " etc. do not represented these terms and limited, and only be for describe clear for the purpose of and be used between these characteristics, key element, step or assembly, identifying.

In addition, describe during the method for various embodiments of the present invention is not limited to specifications or accompanying drawing shown in time sequencing carry out, also can be, carry out concurrently or independently according to other time sequencing.Therefore, the execution sequence of the method for describing in this specification does not constitute restriction to technical scope of the present invention.

About comprising the execution mode of above-mentioned each embodiment, following remarks is also disclosed:

Remarks 1, a kind of being used for comprise at the device of carrying out synchronous detecting based on the communication system of tdd mode:

The normalization unit; It is configured to carrying out normalization process by the sampling point sequence that is used for synchronous detecting in the signal that terminal equipment received that will carry out synchronous detecting, so that each sampling point is based on the parameter relevant with amplitude of all sampling points in the preset range around this sampling point and by regular in the said sampling point sequence; And

Synchronous detection unit, it is configured to carry out synchronous detecting in response to the normalized sampling point sequence of process of said regular unit output.

Remarks 2, like remarks 1 described device, wherein, said regular unit comprises:

The normalization factor computation subunit; It is configured to each sampling point in the said sampling point sequence; Calculate the statistical value that mean value all sampling points, relevant with amplitude perhaps is correlated with amplitude in the said preset range around this sampling point, and with this mean value or statistical value as the normalization factor corresponding with this sampling point;

Postpone subelement, it was configured to the corresponding time of the part of the time span of said sampling point sequence delays and said preset range; And

The normalizer unit; It is configured to each sampling point in the said sampling point sequence; Will be from said delay subelement delay sampling point output, corresponding with this sampling point; Divided by the normalization factor corresponding, so that this sampling point is by normalization with this sampling point from said normalization factor computation subunit output.

Remarks 3, like remarks 2 described devices; Wherein, Said normalization factor computation subunit is configured to each sampling point in the said sampling point sequence, calculates one of at least the normalization factor corresponding with this sampling point in real part mould mean value, imaginary part mould mean value and the real part mould through all sampling points in the said preset range around this sampling point and the mean value of imaginary part mould sum.

Remarks 4, like remarks 2 or 3 described devices, wherein, said delay subelement was configured to half of the time span of said sampling point sequence delays and said preset range, 1/4 or 3/4 corresponding time.

Remarks 5, like remarks 2 or 3 described devices, wherein said normalization factor computation subunit comprises the BORDER PROCESSING parts, it is configured to:

Initial period in normalization process; From the sampling point direction forward that stands normalization process, utilize this sampling point or said preset range is filled up with performance-relevant first fixed value of said terminal equipment, and calculate the normalization factor corresponding with this sampling point based on the preset range that this fills up; And

Ending phase in normalization process; From the sampling point direction backward that stands normalization process, utilize this sampling point or said preset range is filled up with performance-relevant second fixed value of said terminal equipment, and calculate the normalization factor corresponding with this sampling point based on the preset range that this fills up.

Remarks 6, like each described device among the remarks 1-3, also comprise control unit, it is configured to:

To carry out under the situation of search of initial zone at said terminal equipment, control said regular unit and carry out normalization process, detect up to said synchronous detection unit till the ID of the Serving cell that service can be provided for said terminal equipment;

Said terminal equipment in response to the Serving cell corresponding with it in the base station instruction and carry out under the situation of homogeneous frequency adjacent area search, control and carry out normalization process in the scope of said regular unit about the synchronizing signal of the Serving cell of said terminal equipment 2 or 2.5 sub-frame; And

Said terminal equipment in response to the Serving cell corresponding with it in the base station instruction and carry out under the situation of alien frequencies neighboring cell search, control in the interval GAP of said regular unit each alien frequencies neighboring cell search between upward signal and downstream signal and carry out normalization process.

Remarks 7, like each described device among the remarks 1-3, wherein, said synchronous detection unit comprises:

Main synchronizing symbol PSS detection sub-unit; It is configured to adopt respectively the normalized sampling point sequence of process of three known PSS sequences and said regular unit output to carry out related operation; So that detecting PSS sequence corresponding or the PSS sequence corresponding, and detecting corresponding timing position with the correlation that is higher than certain threshold value with the maximum of correlation.

Remarks 8, like remarks 7 described devices, wherein, said synchronous detection unit also comprises:

Auxilliary synchronizing symbol SSS detection sub-unit; It is configured to the normalized sampling point sequence of process based on the output of said main synchronizing symbol PSS detecting unit and said regular unit output; Detect said CELL-ID based on satisfactory sub-district in the communication system of tdd mode; The type of cyclic prefix CP, and frame is regularly.

Remarks 9, like each described device among the remarks 1-8, wherein, said communication system based on tdd mode is TDD-LTE system or TDD-LTEA system.

Remarks 10, a kind of being used for comprise in the method for carrying out synchronous detecting based on the communication system of tdd mode:

To carrying out normalization process by the sampling point sequence that is used for synchronous detecting in the signal that terminal equipment received that will carry out synchronous detecting; So that for each sampling point in the said sampling point sequence, this sampling point is carried out normalization based on the parameter relevant of all sampling points in the preset range around this sampling point with amplitude; And

Carry out synchronous detecting according to the described normalized sampling point sequence of process of carrying out the generating step of normalization process.

Remarks 11, like remarks 10 described methods, wherein, the described normalization process of carrying out comprises:

To each sampling point in the said sampling point sequence; Calculate the statistical value that mean value all sampling points, relevant with amplitude perhaps is correlated with amplitude in the said preset range around this sampling point, and with this mean value or statistical value as the normalization factor corresponding with this sampling point;

With the corresponding time of a part of the time span of said sampling point sequence delays and said preset range; And

To each sampling point in the said sampling point sequence; Will be from described substep delay sampling point output, corresponding with this sampling point that the sampling point sequence is postponed; Divided by substep normalization factor output, corresponding with this sampling point, so that this sampling point is by normalization from described calculating normalization factor.

Remarks 12, like remarks 11 described methods; Wherein, Described calculating normalization factor comprises to each sampling point in the said sampling point sequence, calculates one of at least the normalization factor corresponding with this sampling point in real part mould mean value, imaginary part mould mean value and the real part mould through all sampling points in the said preset range around this sampling point and the mean value of imaginary part mould sum.

Remarks 13, like remarks 11 or 12 described methods, wherein, described to the sampling point sequence postpone to comprise with the time span of said sampling point sequence delays and said preset range half, 1/4 or 3/4 corresponding time.

Remarks 14, like remarks 11 or 12 described methods, wherein said calculating normalization factor also comprises:

Initial period in normalization process; From the sampling point direction forward that stands normalization process, utilize this sampling point or said preset range is filled up with performance-relevant first fixed value of said terminal equipment, and calculate the normalization factor corresponding with this sampling point based on the preset range that this fills up; And

Ending phase in normalization process; From the sampling point direction backward that stands normalization process, utilize this sampling point or said preset range is filled up with performance-relevant second fixed value of said terminal equipment, and calculate the normalization factor corresponding with this sampling point based on the preset range that this fills up.

Remarks 15, like each described method among the remarks 10-12, also comprise:

To carry out controlling described step of carrying out normalization process under the situation of search of initial zone at said terminal equipment, detect up to described step of carrying out synchronous detecting till the ID of the Serving cell that service can be provided for said terminal equipment;

Said terminal equipment in response to the Serving cell corresponding with it in the base station instruction and carry out under the situation of homogeneous frequency adjacent area search, control the said normalization process of execution in the scope of described step of carrying out normalization process about the synchronizing signal of the Serving cell of said terminal equipment 2 or 2.5 sub-frame; And

Said terminal equipment in response to the Serving cell corresponding with it in the base station instruction and carry out under the situation of alien frequencies neighboring cell search, control in the interval GAP of described step of carrying out normalization process each alien frequencies neighboring cell search between upward signal and downstream signal and carry out said normalization process.

Remarks 16, like each described method among the remarks 10-12, wherein, the described synchronous detecting of carrying out comprises:

Adopt three known main synchronizing symbol PSS sequences and the described normalized sampling point sequence of process of carrying out the step output of normalization process to carry out related operation respectively; So that detecting PSS sequence corresponding or the PSS sequence corresponding, and detecting corresponding timing position with the correlation that is higher than certain threshold value with the maximum of correlation.

Remarks 17, like remarks 16 described methods, wherein, the described synchronous detecting of carrying out also comprises:

Assist synchronizing symbol SSS detection based on described testing result and the described normalized sampling point sequence of process of carrying out the step output of normalization process of carrying out main synchronizing symbol PSS detection; So that detect the CELL-ID of satisfactory sub-district in the communication system; The type of cyclic prefix CP, and frame is regularly.

Remarks 18, a kind of have as among the remarks 1-9 any one described be used for carrying out as described in based on the terminal equipment of the device of the synchronous detecting of the communication system of tdd mode.

Remarks 19, a kind of program product that stores the instruction code of machine-readable,

When said instruction code is read and carried out by machine, can carry out like any one described method of in based on the communication system of tdd mode, carrying out synchronous detecting among the remarks 10-17.

Remarks 20, a kind of storage medium that carries like remarks 19 described program products.

Although the present invention is disclosed above through description to specific embodiment of the present invention; But; Should be appreciated that those skilled in the art can design various modifications of the present invention, improve or equivalent in the spirit and scope of accompanying claims.These modifications, improvement or equivalent also should be believed to comprise in protection scope of the present invention.

Claims (10)

1. one kind is used for comprising at the device of carrying out synchronous detecting based on the communication system of tdd mode:

The normalization unit; It is configured to carrying out normalization process by the sampling point sequence that is used for synchronous detecting in the signal that terminal equipment received that will carry out synchronous detecting, so that each sampling point is based on the parameter relevant with amplitude of all sampling points in the preset range around this sampling point and by regular in the said sampling point sequence; And

Synchronous detection unit, it is configured to carry out synchronous detecting in response to the normalized sampling point sequence of process of said regular unit output.

2. device as claimed in claim 1, wherein, said regular unit comprises:

The normalization factor computation subunit; It is configured to each sampling point in the said sampling point sequence; Calculate the statistical value that mean value all sampling points, relevant with amplitude perhaps is correlated with amplitude in the said preset range around this sampling point, and with this mean value or statistical value as the normalization factor corresponding with this sampling point;

Postpone subelement, it was configured to the corresponding time of the part of the time span of said sampling point sequence delays and said preset range; And

The normalizer unit; It is configured to each sampling point in the said sampling point sequence; Will be from said delay subelement delay sampling point output, corresponding with this sampling point; Divided by the normalization factor corresponding, so that this sampling point is by normalization with this sampling point from said normalization factor computation subunit output.

3. device as claimed in claim 2; Wherein, Said normalization factor computation subunit is configured to each sampling point in the said sampling point sequence, calculates one of at least the normalization factor corresponding with this sampling point in real part mould mean value, imaginary part mould mean value and the real part mould through all sampling points in the said preset range around this sampling point and the mean value of imaginary part mould sum.

4. like claim 2 or 3 described devices, wherein, said delay subelement was configured to half of the time span of said sampling point sequence delays and said preset range, 1/4 or 3/4 corresponding time.

5. like claim 2 or 3 described devices, wherein said normalization factor computation subunit comprises the BORDER PROCESSING parts, and it is configured to:

Initial period in normalization process; From the sampling point direction forward that stands normalization process, utilize this sampling point or said preset range is filled up with performance-relevant first fixed value of said terminal equipment, and calculate the normalization factor corresponding with this sampling point based on the preset range that this fills up; And

Ending phase in normalization process; From the sampling point direction backward that stands normalization process, utilize this sampling point or said preset range is filled up with performance-relevant second fixed value of said terminal equipment, and calculate the normalization factor corresponding with this sampling point based on the preset range that this fills up.

6. one kind is used for comprising in the method for carrying out synchronous detecting based on the communication system of tdd mode:

To carrying out normalization process by the sampling point sequence that is used for synchronous detecting in the signal that terminal equipment received that will carry out synchronous detecting; So that for each sampling point in the said sampling point sequence, this sampling point is carried out normalization based on the parameter relevant of all sampling points in the preset range around this sampling point with amplitude; And

Carry out synchronous detecting according to the described normalized sampling point sequence of process of carrying out the generating step of normalization process.

7. method as claimed in claim 6, wherein, the described normalization process of carrying out comprises:

To each sampling point in the said sampling point sequence; Calculate the statistical value that mean value all sampling points, relevant with amplitude perhaps is correlated with amplitude in the said preset range around this sampling point, and with this mean value or statistical value as the normalization factor corresponding with this sampling point;

With the corresponding time of a part of the time span of said sampling point sequence delays and said preset range; And

To each sampling point in the said sampling point sequence; Will be from described substep delay sampling point output, corresponding with this sampling point that the sampling point sequence is postponed; Divided by substep normalization factor output, corresponding with this sampling point, so that this sampling point is by normalization from described calculating normalization factor.

8. method as claimed in claim 7, wherein, described calculating normalization factor comprises pin

To each sampling point in the said sampling point sequence, calculate one of at least the normalization factor corresponding in real part mould mean value, imaginary part mould mean value and the real part mould through all sampling points in the said preset range around this sampling point and the mean value of imaginary part mould sum with this sampling point.

9. like claim 7 or 8 described methods, wherein, described to the sampling point sequence postpone to comprise with the time span of said sampling point sequence delays and said preset range half, 1/4 or 3/4 corresponding time.

One kind have as among the claim 1-5 any one described be used for carrying out as described in based on the terminal equipment of the device of the synchronous detecting of the communication system of tdd mode.

Images