CN100596128C - A detection method and device for position of primary common control physical channel - Google Patents

Abstract

The invention provides a detection method and a device of main common control physical channel position. The detection method of the main common control physical channel position includes: step A, TD-SCDMA terminal carries out channel estimation according to Midamble code and SYNC-DL code in received TD-SCDMA subframe; step B, carry out conjugate multiplication and summarizing from two channel estimation results obtain in step A, obtain the accumulated value and calculate the phase position of the accumulated value and obtain the absolute phase position information of subframe SYNC-DL code; step C, judge PCCPCH position according to the SYNC-DL code absolute phase position information by successive subframe calculation. The detection method and the device in the invention can effectively and correctly detect the position information of PCCPCH.

Description

A kind of detection method of position of primary common control physical channel and device

Technical field

The present invention relates to wireless communication technology field, be particularly related to a kind of Time Division-Synchronous Code Division Multiple Access (TD-SCDMA that is applied to, Time-Division Synchronization Code Division Multiple Access) detection method and the device of the Primary Common Control Physical Channel of terminal (PCCPCH, Primary Common Control PhysicalChannel).

Background technology

The TD-SCMDA terminal is when carrying out Cell searching, and (BCH is BroadcastChannel) with the broadcast message in the acquisition system need to read broadcast channel.But before reading BCH, must at first determine the position of PCCPCH.In the TD-SCDMA system, the position of PCCPCH is to be identified by the phase sequence information that the descending synchronous code (SYNC-DL) through quaternary PSK (QPSK) modulation carries.

Only there are two kinds of phase sequences in SYNC-DL sign indicating number in the TD-SCMDA system: [135 °, 45 °, 225 °, 135 °] and [315 °, 225 °, 315 °, 45 °].The SYNC-DL code phase of four continuous subframes can be used for judging whether there is PCCPCH in ensuing four subframes, be specially: if the SYNC-DL code phase of four continuous subframes is respectively [135 °, 45 °, 225 °, 135 °], in ensuing four subframes, will there be PCCPCH so; If the SYNC-DL code phase of four continuous subframes is respectively [315 °, 225 °, 315 °, 45 °], in ensuing four subframes, will there be PCCPCH so.

Therefore, how to calculate the SYNC-DL code phase accurately and effectively and detect the PCCPCH positional information, become in the TD-SCDMA Terminal Design very critical technical problems.

Summary of the invention

Technical problem to be solved by this invention provides the detection method and the device of a kind of PCCPCH position, is used for the position that the TD-SCDMA terminal detects PCCPCH.

For solving the problems of the technologies described above, it is as follows to the invention provides scheme:

The detection method of a kind of Primary Common Control Physical Channel PCCPCH position may further comprise the steps:

Steps A, the TD-SCDMA terminal is carried out channel estimating respectively according to training sequence Midamble sign indicating number and the down-going synchronous SYNC-DL sign indicating number in the TD-SCDMA subframe that receives;

Step B calculates the absolute phase information of the SYNC-DL sign indicating number of this subframe according to two channel estimation results of gained in the steps A;

Step C according to the absolute phase information of the SYNC-DL sign indicating number that continuous subframes is calculated, judges the position of PCCPCH;

Wherein, among the described step B, described absolute phase information according to two channel estimation results calculating SYNC-DL sign indicating numbers is, two channel estimation results of gained in the steps A are carried out conjugate multiplication and add up, obtain accumulated value, calculate the phase place of gained accumulated value again, obtain the absolute phase information of the SYNC-DL sign indicating number of this subframe.

Detection method shown in the present, wherein,

In the described steps A, the TD-SCDMA terminal is further carried out channel estimating according to the Midamble sign indicating number in the TS0 time slot.

Detection method shown in the present, wherein,

In the described steps A, the TD-SCDMA terminal is further carried out channel estimating according to back 128 chips of the Midamble sign indicating number in the TS0 time slot.

Detection method shown in the present, wherein,

In the described steps A, the Midamble sign indicating number that described basis receives carries out channel estimating and comprises:

Respectively basic Midamble sign indicating number of this locality and the Midamble sign indicating number that receives are carried out Fourier transform, obtain corresponding frequency domain sequence;

The frequency domain sequence of the frequency domain sequence of the Midamble sign indicating number that receives and local basic Midamble sign indicating number is carried out contraposition be divided by, obtain the contraposition value of being divided by, again the contraposition value of being divided by is carried out inverse Fourier transform, obtain the channel estimation results of Midamble sign indicating number;

In the described steps A, describedly carry out channel estimating according to the SYNC-DL sign indicating number and comprise:

Respectively SYNC-DL sign indicating number of this locality and the SYNC-DL sign indicating number that receives are carried out Fourier transform, obtain corresponding frequency domain sequence;

The frequency domain sequence of the frequency domain sequence of the SYNC-DL that receives and local SYNC-DL sign indicating number is carried out contraposition be divided by, obtain the contraposition value of being divided by, again the contraposition value of being divided by is carried out inverse Fourier transform, obtain the channel estimation results of SYNC-DL.

Detection method shown in the present, wherein,

Among the described step B, described two channel estimation results of gained in the steps A are carried out conjugate multiplication and add up is that preceding 16 of two channel estimation results of gained in the steps A are carried out conjugate multiplication and add up.

Detection method shown in the present, wherein, described step C specifically comprises:

Absolute phase to the SYNC-DL sign indicating number of subframe is carried out hard decision, output phase hard decision result;

According to the sequencing of subframe reception, with the synthetic synthesis phase sequence of the phase place hard decision result of continuous subframes;

Described synthesis phase sequence and particular phases sequence are compared, and judge the position of PCCPCH according to comparative result.

Detection method shown in the present, wherein, the absolute phase of described SYNC-DL sign indicating number to subframe is carried out hard decision and is: according to decision algorithm

Wherein, P (n) is the absolute phase of the SYNC-DL sign indicating number of subframe, 0 °≤P (n)＜360 °,

Be the absolute phase court verdict.

Detection method shown in the present, wherein,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 4 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence and particular phases sequence [135 °, 45 °, 225 °, 135 °] are identical, judge in four subframes after described 4 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [315 °, 225 °, 315 °, 45 °] are identical, judge in four subframes after described 4 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

Detection method shown in the present, wherein,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 3 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence and particular phases sequence [45 °, 225 °, 135 °] are identical, judge in four subframes after described 3 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [135 °, 45 °, 225 ° ,] when identical, judge in four subframes after the back subframe of described 3 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [225 °, 315 °, 45 °] are identical, judge in four subframes after described 3 continuous subframes not have PCCPCH;

When described synthesis phase sequence and particular phases sequence [315 °, 225 °, 315 °] are identical, judge in four subframes after the back subframe of described 3 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

Detection method shown in the present, wherein,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 2 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence is identical with particular phases sequence [225 °, 135 °], judge in described 2 continuous subframes four subframes afterwards to have PCCPCH;

When described synthesis phase sequence is identical with particular phases sequence [45 °, 225 °], judge in four subframes after the back subframe of described 2 continuous subframes to have PCCPCH;

When described synthesis phase sequence is identical with particular phases sequence [135 °, 45 °], judge in four subframes after latter two subframes of described 2 continuous subframes to have PCCPCH;

When described synthesis phase sequence is identical with particular phases sequence [315 °, 45 °], judge in described 2 continuous subframes four subframes afterwards not have PCCPCH;

When described synthesis phase sequence is identical with particular phases sequence [225 °, 315 °], judge in four subframes after the back subframe of described 2 continuous subframes not have PCCPCH;

When described synthesis phase sequence is identical with particular phases sequence [315 °, 225 °], judge in four subframes after latter two subframes of described 2 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

Detection method shown in the present, wherein, described step C specifically comprises:

The absolute phase of the SYNC-DL sign indicating number of the last subframe of current subframe is deducted the absolute phase of the SYNC-DL sign indicating number of current subframe, obtain the relative phase of the SYNC-DL sign indicating number of current subframe;

Relative phase to the SYNC-DL sign indicating number of subframe carries out hard decision, the output phase court verdict;

According to the sequencing of subframe reception, with the synthetic synthesis phase sequence of the phase place hard decision result of continuous subframes;

Described synthesis phase sequence and particular phases sequence are compared, and judge the position of PCCPCH according to comparative result.

Detection method shown in the present, wherein, the relative phase of described SYNC-DL sign indicating number to subframe carries out hard decision and is: according to decision algorithm

Wherein, P ' is the relative phase of the SYNC-DL sign indicating number of subframe (n),

Be the relative phase court verdict.

Detection method shown in the present, wherein,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 4 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence and particular phases sequence [90 °, 90 ° ,-180 ° ,-90 °] or [0 °, 90 ° ,-180 ° ,-90 °] are identical, judge in four subframes after described 4 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [180 °, 90 ° ,-90 °, 270 °] or [270 °, 90 ° ,-90 °, 270 °] are identical, judge in four subframes after described 4 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

Detection method shown in the present, wherein,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 3 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence and particular phases sequence [90 °, 90 ° ,-180 °] or [0 °, 90 ° ,-180 °] are identical, judge in four subframes after the back subframe of described 3 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [180 °, 90 ° ,-90 °] or [270 °, 90 ° ,-90 °] are identical, judge in four subframes after the back subframe of described 3 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

Detection method shown in the present, wherein,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 2 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence and particular phases sequence [90 °, 90 °] or [0 °, 90 °] are identical, judge in four subframes after latter two subframes of described 2 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [180 °, 90 °] or [270 °, 90 °] are identical, judge in four subframes after latter two subframes of described 2 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

The checkout gear of a kind of PCCPCH position comprises: channel estimator, phase calculator and phase sequence detector, wherein,

Described channel estimator is used for carrying out channel estimating respectively according to the Midamble sign indicating number and the SYNC-DL sign indicating number of the TD-SCDMA subframe that receives;

Described phase calculator is used for calculating according to two channel estimation results that described channel estimator obtains the absolute phase information of the SYNC-DL sign indicating number of this subframe;

Described phase sequence detector is used for the absolute phase information of the SYNC-DL sign indicating number that continuous subframes calculated according to described phase calculator, judges the position of PCCPCH;

Wherein, described phase calculator is further used for two channel estimation results that described channel estimator obtains are carried out conjugate multiplication and add up, and obtains accumulated value, calculates the phase place of gained accumulated value again, obtains the absolute phase information of the SYNC-DL sign indicating number of this subframe.

Checkout gear of the present invention, wherein, described phase sequence detector specifically comprises: phase place hard decision unit, sequence synthesis unit and sequence comparing unit, wherein,

Described phase place hard decision unit is used for the absolute phase of the SYNC-DL sign indicating number of subframe is carried out hard decision, output phase hard decision result;

Described sequence synthesis unit is used for the synthetic synthesis phase sequence of the court verdict of described phase place hard decision unit;

Described sequence comparing unit is used for synthesis phase sequence and particular phases sequence that described sequence synthesis unit is synthetic and compares, and judges the position of PCCPCH according to comparative result.

Checkout gear of the present invention, wherein, described phase sequence detector specifically comprises: relative phase computing unit, phase place hard decision unit, sequence synthesis unit and sequence comparing unit, wherein,

Described relative phase computing unit is used for the phase place of the SYNC-DL sign indicating number of the last subframe of current subframe is deducted the phase place of the SYNC-DL sign indicating number of current subframe, obtains the relative phase of the SYNC-DL sign indicating number of current subframe;

Described phase place hard decision unit is used for the relative phase of the SYNC-DL sign indicating number of subframe is carried out hard decision, output phase hard decision result.

Described sequence synthesis unit is used for the synthetic synthesis phase sequence of the court verdict of described phase place hard decision unit;

Described sequence comparing unit is used for synthesis phase sequence and particular phases sequence that described sequence synthesis unit is synthetic and compares, and judges the position of PCCPCH according to comparative result.

From the above as can be seen, detection method of the present invention and device, by the channel estimating of SYNC-DL sign indicating number and Midamble sign indicating number being carried out conjugate multiplication and adding up, can obtain the phase information of SYNC-DL sign indicating number according to the phase information of accumulated value, thereby detect the position of PCCPCH accurately and effectively.And the present invention also by utilizing relative phase to detect the PCCPCH position, has further improved the accuracy of PCCPCH position probing.

Description of drawings

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

Fig. 2 is TD-SCDMA system business structure of time slot figure;

Fig. 3 is the structural representation of the checkout gear of the described PCCPCH of embodiment of the invention position;

Fig. 4 is the structural representation of the described phase sequence detector of the embodiment of the invention;

Fig. 5 is another structural representation of the described phase sequence detector of the embodiment of the invention;

Fig. 6 is the flow chart of the detection method of the described PCCPCH of embodiment of the invention position;

Fig. 7 is the data structure structural map of LocSync in the described detection method of the embodiment of the invention.

Embodiment

The invention provides the detection method and the device of a kind of PCCPCH position, utilize training sequence (Midamble) sign indicating number and SYNC-DL sign indicating number to carry out channel estimating respectively, obtain the phase information of SYNC-DL sign indicating number according to channel estimation results, thereby detect the position of PCCPCH accurately and effectively.The present invention is described in detail by specific embodiment below in conjunction with accompanying drawing.

Figure 1 shows that the TD-SCDMA system frame structure; the length of a TDMA subframe is 5ms; each subframe is divided into 7 business time-slots (TS0-TS6) and 3 special time slots that length is 675us again: descending pilot frequency time slot (DwPTS; Downlink Pilot Time Slot), protection interval (GP) and uplink pilot time slot (UpPTS, Uplink Pilot Time Slot).Wherein TS0 always distribute to down link (DL, Downlink), and TS 1 always distribute to up link (UL, Uplink).The SYNC-DL sign indicating number is arranged in DwPTS, and length is 64 chips.Fig. 2 is TD-SCDMA system business structure of time slot figure, comprises the Midamble sign indicating number of 144 chips in the business time-slot.

The embodiment of the invention provides a kind of PCCPCH the checkout gear of position, and as shown in Figure 3, this checkout gear comprises: channel estimator 31, phase calculator 32 and phase sequence detector 33, wherein,

Described channel estimator 31 is used for carrying out channel estimating respectively according to the Midamble sign indicating number and the SYNC-DL sign indicating number of the TD-SCDMA subframe that receives.

Described phase calculator 32 is used for calculating according to two channel estimation results that described channel estimator 31 obtains the absolute phase information of the SYNC-DL sign indicating number of this subframe.Here, described phase calculator 32 is further used for two channel estimation results that described channel estimator 31 obtains are carried out conjugate multiplication and add up, obtain accumulated value, calculate the phase place of gained accumulated value again, obtain the absolute phase information of the SYNC-DL sign indicating number of this subframe.

Described phase sequence detector 33 is used for the absolute phase information of the SYNC-DL sign indicating number that calculates according to 32 pairs of continuous subframes of described phase calculator, judges the position of PCCPCH.

Here, as shown in Figure 4, described phase sequence detector 33 specifically comprises again: phase place hard decision unit 331, sequence synthesis unit 332 and sequence comparing unit 333, wherein,

Described phase place hard decision unit 331 is used for the absolute phase of the SYNC-DL sign indicating number of subframe is carried out hard decision, output phase hard decision result;

Described sequence synthesis unit 332 is used for the synthetic synthesis phase sequence of the court verdict of described phase place hard decision unit 331;

Described sequence comparing unit 333 is used for described sequence synthesis unit 332 synthetic synthesis phase sequence and particular phases sequences are compared, and judges the position of PCCPCH according to comparative result.

For relative phase is calculated, as shown in Figure 5, described phase sequence detector 33 can specifically comprise again: relative phase computing unit 334, phase place hard decision unit 335, sequence synthesis unit 336 and sequence comparing unit 337, wherein,

Described relative phase computing unit 334 is used for the phase place of the SYNC-DL sign indicating number of the last subframe of current subframe is deducted the phase place of the SYNC-DL sign indicating number of current subframe, obtains the relative phase of the SYNC-DL sign indicating number of current subframe;

Described phase place hard decision unit 335 is used for the relative phase that described relative phase computing unit 334 obtains being carried out hard decision, output phase hard decision result.

Described sequence synthesis unit 336 is used for the synthetic synthesis phase sequence of the court verdict of described phase place hard decision unit 335;

Described sequence comparing unit 337 is used for described sequence synthesis unit 336 synthetic synthesis phase sequence and particular phases sequences are compared, and judges the position of PCCPCH according to comparative result.

Checkout gear based on above-mentioned PCCPCH position, present embodiment also provides a kind of PCCPCH the detection method of position, please refer to shown in Figure 6, flow chart for the detection method of the described PCCPCH of embodiment of the invention position, be applied to the TD-SCDMA terminal and detect the PCCPCH position, this method may further comprise the steps:

Step 61, the TD-SCDMA terminal is carried out channel estimating respectively according to Midamble sign indicating number and the SYNC-DL sign indicating number in the TD-SCDMA subframe that receives.

Here, preferably the Midamble sign indicating number among the TS0 carries out channel estimating in the subframe according to receiving.The channel estimation method that can be used for channel estimating has multiple, for inter-frequency networking, can adopt single cell channel algorithm for estimating; For identical networking, can adopt the multi-cell channel algorithm for estimating.In the present embodiment, provide a kind of algorithm of estimating based on single cell channel of Fourier transformation computation:

For 144 Midamble chips among the TS0 that receives, for fear of the hangover influence of data division to the Midamble sign indicating number, therefore, select back 128 chips (representing with RecMid) of Midamble sign indicating number to be used for channel estimating, the computing formula of its channel estimating is as follows:

h′ _Mid＝IFFT(FFT(RecMid)./FFT(LocMid))，

Wherein, LocMid represents local basic Midamble sign indicating number (its length and scope are corresponding to RecMid), and FFT represents fast fourier transform (or Fourier transform), and IFFT represents fast adverse Fourier transform (or inverse Fourier transform), ./expression contraposition is divided by (point removes), h ' _MidExpression is at the channel estimation results of 128 Midamble chips, and it is a sequence with the RecMid equal in length.In the TD-SCDMA system, the representative value of channel estimating length is 16, therefore, only gets h ' here _MidPreceding 16 channel estimation results h as the Midamble sign indicating number _Mid, that is: h _Mid=h ' _Mid(1: 16).

For calculating channel estimating, also adopt and the similar method of Midamble sign indicating number, that is: according to the SYNC-DL yardage

h′ _Sync＝IFFT(FFT(RecSync)./FFT(LocSync))

h _Sync＝h′ _Sync(1∶16)

Wherein, RecSync represents the SYNC-DL sign indicating number that terminal receives, and LocSync represents that this locality is used for the SYNC-DL sign indicating number that calculating channel is estimated, h _SyncH ' is got in expression _SyncThe channel estimation results of preceding 16 SYNC-DL sign indicating number.Here, it is to be noted, in the actual communication systems, for the SYNC-DL sign indicating number that makes reception is not lost any information, when receiving the SYNC-DL sign indicating number, the chip lengths of actual reception is greater than 64 usually, for example, the GP of each 32 chip of SYNC-DL sign indicating number two ends is received in the lump, at this moment, the total reception length of SYNC-DL sign indicating number is 128 (128 is 2 integral number power, so that use the Fourier computing).By frame structure as can be known, under the situation of not introducing the adjacent time-slots interference, the reception length range of SYNC-DL sign indicating number is between 64～(32+64+96), promptly between 64～192.When the reception length of SYNC-DL sign indicating number is greater than 64, the length that is RecSync is greater than 64 the time, this moment, LocSync should be configured to the corresponding to structure with RecSync, for example, when the GP with SYNC-DL sign indicating number each 32chip of two ends receives in the lump, the data structure of LocSync increases by 0 of 32 chips at the SYNC-DL of this locality sign indicating number two ends respectively as shown in Figure 7, makes it to have the corresponding to structure with RecSync.

Step 62 is according to two channel estimation results (h of gained in the step 61 _MidAnd h _Sync) calculate the absolute phase information P (n) of the SYNC-DL sign indicating number of this subframe.

Here, concrete can be, to two channel estimation results (h of gained in the step 61 _MidAnd h _Sync) carry out conjugate multiplication and add up, obtain accumulated value, calculate the phase place of gained accumulated value again, obtain the absolute phase information P (n) of the SYNC-DL sign indicating number of this subframe, promptly can calculate described accumulated value (representing) and phase place according to following formula with C:

$C=\underset{k=1}{\overset{16}{\mathrm{\Σ}}}[h_{\mathrm{mid}}{\left(k\right)}^{*}\×h_{\mathrm{sync}}\left(k\right)],$

P(n)＝phase(C)，

Wherein, h _Mid(k) ^*Expression h _MidConjugation, the phase place that plural C is got in phase (C) expression, the absolute phase of the SYNC-DL of n subframe of P (n) expression.Here, concrete phase calculation method has multiple, for example can be according to the arc-tangent value of the ratio of the imaginary part of plural C and real part:

Calculate absolute phase, wherein, the imaginary part of the plural C of Im (C) expression, the real part of the plural C of Re (C) expression, the span of phase place P (n) is 0 °≤P (n)＜360 °.

Step 63, TD-SCDMA terminal are judged the position of PCCPCH according to the absolute phase information of the SYNC-DL sign indicating number that continuous subframes is calculated.

Here, the TD-SCDMA terminal calculate continuous subframes the SYNC-DL sign indicating number absolute phase and judge the position of PCCPCH, two kinds of implementations can be arranged: absolute phase Sequence Detection and relative phase Sequence Detection below are illustrated respectively:

(1) for the absolute phase Sequence Detection, at first, the TD-SCDMA terminal is directly carried out hard decision, output phase hard decision result to the absolute phase of the SYNC-DL sign indicating number of subframe; Then, according to the sequencing of subframe reception, with the synthetic synthesis phase sequence of the phase place hard decision result of a continuous N subframe; At last, described synthesis phase sequence and particular phases sequence are compared, and judge the position of PCCPCH according to comparative result.

Here, to carry out hard decision be according to decision algorithm to the absolute phase of described SYNC-DL sign indicating number to subframe

Carry out hard decision,

In the following formula, P (n) is the absolute phase of the SYNC-DL sign indicating number of subframe, 0 °≤P (n)＜360 °,

Be the absolute phase court verdict.

Here, the synthetic synthesis phase sequence (S (n)) of described phase place hard decision result with a continuous N subframe, can be by following formulate:

In the following formula, if n＜0 can make

Equal invalid value, for example,

Here, synthesis phase sequence and particular phases sequence relatively in, be to select the particular phases sequence, S (n) compared with the particular phases sequence according to the phase place characteristics of SYNC-DL sign indicating number in the TD-SCDMA system, below according to N get 4,3 and 2 three kind of situation comparison procedure is described respectively:

1. work as N and get 4, when promptly comprising the absolute phase information of 4 continuous subframes among the S (n):

When S (n) and particular phases sequence [135 °, 45 °, 225 °, 135 °] are identical, judge in four subframes after these 4 continuous subframes to have PCCPCH;

When S (n) and particular phases sequence [315 °, 225 °, 315 °, 45 °] are identical, judge in four subframes after these 4 continuous subframes not have PCCPCH;

When S (n) is different from above-mentioned arbitrary particular phases sequence, export an invalid judged result.

2. work as N and get 3, when promptly comprising the absolute phase information of 3 continuous subframes among the S (n):

When S (n) and particular phases sequence [45 °, 225 °, 135 °] are identical, judge in four subframes after these 3 continuous subframes to have PCCPCH;

When S (n) and particular phases sequence [135 °, 45 °, 225 ° ,] when identical, judge in four subframes after the back subframe of these 3 continuous subframes to have PCCPCH;

When S (n) and particular phases sequence [225 °, 315 °, 45 °] are identical, judge in four subframes after these 3 continuous subframes not have PCCPCH;

When S (n) and particular phases sequence [315 °, 225 °, 315 °] are identical, judge in four subframes after the back subframe of these 3 continuous subframes not have PCCPCH;

When S (n) is different from above-mentioned arbitrary particular phases sequence, export an invalid judged result.

3. work as N and get 2, when promptly comprising the absolute phase information of 2 continuous subframes among the S (n):

When S (n) is identical with particular phases sequence [225 °, 135 °], judge in these 2 continuous subframes four subframes afterwards to have PCCPCH;

When S (n) is identical with particular phases sequence [45 °, 225 °], judge in four subframes after the back subframe of these 2 continuous subframes to have PCCPCH;

When S (n) is identical with particular phases sequence [135 °, 45 °], judge in four subframes after latter two subframes of this 2 continuous subframes to have PCCPCH;

When S (n) is identical with particular phases sequence [315 °, 45 °], judge in these 2 continuous subframes four subframes afterwards not have PCCPCH;

When S (n) is identical with particular phases sequence [225 °, 315 °], judge in four subframes after the back subframe of these 2 continuous subframes not have PCCPCH;

When S (n) is identical with particular phases sequence [315 °, 225 °], judge in four subframes after latter two subframes of this 2 continuous subframes not have PCCPCH;

When S (n) is different from above-mentioned arbitrary particular phases sequence, export an invalid judged result.

(2) for the relative phase Sequence Detection, the TD-SCDMA terminal at first deducts the absolute phase of the SYNC-DL sign indicating number of the last subframe of current subframe the absolute phase of the SYNC-DL sign indicating number of current subframe, obtains the relative phase of the SYNC-DL sign indicating number of current subframe; Relative phase to the SYNC-DL sign indicating number of subframe carries out hard decision, the output phase court verdict then; According to the sequencing of subframe reception, with the synthetic synthesis phase sequence of the phase place hard decision result of continuous subframes; At last, described synthesis phase sequence and particular phases sequence are compared, and judge the position of PCCPCH according to comparative result.

Here, described relative phase can by formula P ' (n)=P (n-1)-P (n) calculates, wherein P ' (n) represent the relative phase of the SYNC-DL sign indicating number of subframe, P (n-1) represents the absolute phase of a last subframe of the pairing subframe of P (n).

Here, relative phase being carried out hard decision, is according to decision algorithm

Carry out hard decision,

Wherein, P ' polarity (n) is got in sign (P ' (n)) expression,

Expression relative phase court verdict.

Similarly, the sequencing according to subframe receives synthesizes a synthesis phase sequence S ' (n) with the relative phase court verdict, wherein

(in this formula, if n＜0 can make P ' (n) equal invalid value, for example, P ' (n)=-5.), and compare with the particular phases sequence, below still this comparison procedure is described respectively by N value 4 .3 and 2:

1. get 4 as N, when promptly S ' comprises the relative phase information of 4 continuous subframes in (n):

, judge in four subframes after these 4 continuous subframes to have PCCPCH (n) with particular phases sequence [90 °, 90 ° ,-180 ° ,-90 °] or [0 °, 90 ° ,-180 ° ,-90 °] when identical as S ';

, judge in four subframes after these 4 continuous subframes not have PCCPCH (n) with particular phases sequence [180 °, 90 ° ,-90 °, 270 °] or [270 °, 90 ° ,-90 °, 270 °] when identical as S ';

When S ' (n) is different from above-mentioned arbitrary particular phases sequence, export an invalid judged result.

2. get 3 as N, when promptly S ' comprises the relative phase information of 3 continuous subframes in (n):

, judge in four subframes after the back subframe of these 3 continuous subframes to have PCCPCH (n) with particular phases sequence [90 °, 90 ° ,-180 °] or [0 °, 90 ° ,-180 °] when identical as S ';

, judge in four subframes after the back subframe of these 3 continuous subframes not have PCCPCH (n) with particular phases sequence [180 °, 90 ° ,-90 °] or [270 °, 90 ° ,-90 °] when identical as S ';

When S ' (n) is different from above-mentioned arbitrary particular phases sequence, export an invalid judged result.

3. get 2 as N, when promptly S ' comprises the relative phase information of 2 continuous subframes in (n):

, judge in four subframes after latter two subframes of this 2 continuous subframes to have PCCPCH (n) with particular phases sequence [90 °, 90 °] or [0 °, 90 °] when identical as S ';

, judge in four subframes after latter two subframes of this 2 continuous subframes not have PCCPCH (n) with particular phases sequence [180 °, 90 °] or [270 °, 90 °] when identical as S ';

When S ' (n) is different from above-mentioned arbitrary particular phases sequence, export an invalid judged result.

The process of absolute phase Sequence Detection and relative phase Sequence Detection below has been described respectively.In the actual detected process, choosing of N value can be decided according to the actual requirements: the N value is big more, and probability of false detection is more little, but false dismissal probability is big more; The N value is more little, and probability of false detection is big more, but false dismissal probability is more little.Adopt relative phase to carry out the position probing of PCCPCH, can cancellation receiver frequency and the inconsistent influence of base station frequency to phase calculation, thereby can improve the accuracy of PCCPCH position probing.

Should be noted that at last, the detection method and the device of PCCPCH of the present invention position, be not restricted to listed utilization in specification and the execution mode, it can be applied to various suitable the present invention's field fully, for those skilled in the art, can easily realize additional advantage and make amendment, therefore under the situation of the spirit and scope of the universal that does not deviate from claim and equivalency range and limited, the examples shown that the present invention is not limited to specific details, representational equipment and illustrates here and describe.

Claims (18)

1. the detection method of a Primary Common Control Physical Channel PCCPCH position is characterized in that, may further comprise the steps:

Steps A, the TD-SCDMA terminal is carried out channel estimating respectively according to training sequence Midamble sign indicating number and the down-going synchronous SYNC-DL sign indicating number in the TD-SCDMA subframe that receives;

Step B calculates the absolute phase information of the SYNC-DL sign indicating number of this subframe according to two channel estimation results of gained in the steps A;

Step C according to the absolute phase information of the SYNC-DL sign indicating number that continuous subframes is calculated, judges the position of PCCPCH;

Wherein, among the described step B, described absolute phase information according to two channel estimation results calculating SYNC-DL sign indicating numbers is, two channel estimation results of gained in the steps A are carried out conjugate multiplication and add up, obtain accumulated value, calculate the phase place of gained accumulated value again, obtain the absolute phase information of the SYNC-DL sign indicating number of this subframe.

2. detection method as claimed in claim 1 is characterized in that,

In the described steps A, the TD-SCDMA terminal is further carried out channel estimating according to the Midamble sign indicating number in the TS0 time slot.

3. method as claimed in claim 2 is characterized in that,

In the described steps A, the TD-SCDMA terminal is further carried out channel estimating according to back 128 chips of the Midamble sign indicating number in the TS0 time slot.

4. detection method as claimed in claim 1 is characterized in that,

In the described steps A, the Midamble sign indicating number that described basis receives carries out channel estimating and comprises:

Respectively basic Midamble sign indicating number of this locality and the Midamble sign indicating number that receives are carried out Fourier transform, obtain corresponding frequency domain sequence;

The frequency domain sequence of the frequency domain sequence of the Midamble sign indicating number that receives and local basic Midamble sign indicating number is carried out contraposition be divided by, obtain the contraposition value of being divided by, again the contraposition value of being divided by is carried out inverse Fourier transform, obtain the channel estimation results of Midamble sign indicating number;

In the described steps A, describedly carry out channel estimating according to the SYNC-DL sign indicating number and comprise:

Respectively SYNC-DL sign indicating number of this locality and the SYNC-DL sign indicating number that receives are carried out Fourier transform, obtain corresponding frequency domain sequence;

The frequency domain sequence of the frequency domain sequence of the SYNC-DL that receives and local SYNC-DL sign indicating number is carried out contraposition be divided by, obtain the contraposition value of being divided by, again the contraposition value of being divided by is carried out inverse Fourier transform, obtain the channel estimation results of SYNC-DL.

5. the method for claim 1 is characterized in that,

Among the described step B, described two channel estimation results of gained in the steps A are carried out conjugate multiplication and add up is that preceding 16 of two channel estimation results of gained in the steps A are carried out conjugate multiplication and add up.

6. detection method as claimed in claim 1 is characterized in that, described step C specifically comprises:

Absolute phase to the SYNC-DL sign indicating number of subframe is carried out hard decision, output phase hard decision result;

According to the sequencing of subframe reception, with the synthetic synthesis phase sequence of the phase place hard decision result of continuous subframes;

Described synthesis phase sequence and particular phases sequence are compared, and judge the position of PCCPCH according to comparative result.

7. method as claimed in claim 6 is characterized in that, the absolute phase of described SYNC-DL sign indicating number to subframe is carried out hard decision and is: according to decision algorithm

Carry out hard decision,

Wherein, P (n) is the absolute phase of the SYNC-DL sign indicating number of subframe, 0 °≤P (n)＜360 °,

Be the absolute phase court verdict.

8. method as claimed in claim 7 is characterized in that,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 4 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence and particular phases sequence [135 °, 45 °, 225 °, 135 °] are identical, judge in four subframes after described 4 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [315 °, 225 °, 315 °, 45 °] are identical, judge in four subframes after described 4 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

9. method as claimed in claim 7 is characterized in that,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 3 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence and particular phases sequence [45 °, 225 °, 135 °] are identical, judge in four subframes after described 3 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [135 °, 45 °, 225 ° ,] when identical, judge in four subframes after the back subframe of described 3 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [225 °, 315 °, 45 °] are identical, judge in four subframes after described 3 continuous subframes not have PCCPCH;

When described synthesis phase sequence and particular phases sequence [315 °, 225 °, 315 °] are identical, judge in four subframes after the back subframe of described 3 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

10. method as claimed in claim 7 is characterized in that,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 2 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence is identical with particular phases sequence [225 °, 135 °], judge in described 2 continuous subframes four subframes afterwards to have PCCPCH;

When described synthesis phase sequence is identical with particular phases sequence [45 °, 225 °], judge in four subframes after the back subframe of described 2 continuous subframes to have PCCPCH;

When described synthesis phase sequence is identical with particular phases sequence [135 °, 45 °], judge in four subframes after latter two subframes of described 2 continuous subframes to have PCCPCH;

When described synthesis phase sequence is identical with particular phases sequence [315 °, 45 °], judge in described 2 continuous subframes four subframes afterwards not have PCCPCH;

When described synthesis phase sequence is identical with particular phases sequence [225 °, 315 °], judge in four subframes after the back subframe of described 2 continuous subframes not have PCCPCH;

When described synthesis phase sequence is identical with particular phases sequence [315 °, 225 °], judge in four subframes after latter two subframes of described 2 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

11. detection method as claimed in claim 1 is characterized in that, described step C specifically comprises:

The absolute phase of the SYNC-DL sign indicating number of the last subframe of current subframe is deducted the absolute phase of the SYNC-DL sign indicating number of current subframe, obtain the relative phase of the SYNC-DL sign indicating number of current subframe;

Relative phase to the SYNC-DL sign indicating number of subframe carries out hard decision, the output phase court verdict;

According to the sequencing of subframe reception, with the synthetic synthesis phase sequence of the phase place hard decision result of continuous subframes;

Described synthesis phase sequence and particular phases sequence are compared, and judge the position of PCCPCH according to comparative result.

12. method as claimed in claim 11 is characterized in that, the relative phase of described SYNC-DL sign indicating number to subframe carries out hard decision and is: according to decision algorithm

Carry out hard decision,

Wherein, P ' is the relative phase of the SYNC-DL sign indicating number of subframe (n),

Be the relative phase court verdict.

13. method as claimed in claim 12 is characterized in that,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 4 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence and particular phases sequence [90 °, 90 ° ,-180 ° ,-90 °] or [0 °, 90 ° ,-180 ° ,-90 °] are identical, judge in four subframes after described 4 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [180 °, 90 ° ,-90 °, 270 °] or [270 °, 90 ° ,-90 °, 270 °] are identical, judge in four subframes after described 4 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

14. method as claimed in claim 12 is characterized in that,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 3 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence and particular phases sequence [90 °, 90 ° ,-180 °] or [0 °, 90 ° ,-180 °] are identical, judge in four subframes after the back subframe of described 3 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [180 °, 90 ° ,-90 °] or [270 °, 90 ° ,-90 °] are identical, judge in four subframes after the back subframe of described 3 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

15. method as claimed in claim 12 is characterized in that,

Described comparative result according to synthesis phase sequence and particular phases sequence judges that the position of PCCPCH is: if include the phase place hard decision result of 2 continuous subframes in the described synthesis phase sequence,

When described synthesis phase sequence and particular phases sequence [90 °, 90 °] or [0 °, 90 °] are identical, judge in four subframes after latter two subframes of described 2 continuous subframes to have PCCPCH;

When described synthesis phase sequence and particular phases sequence [180 °, 90 °] or [270 °, 90 °] are identical, judge in four subframes after latter two subframes of described 2 continuous subframes not have PCCPCH;

When described synthesis phase sequence is different from above-mentioned arbitrary particular phases sequence, judge the failure of PCCPCH position probing.

16. the checkout gear of a PCCPCH position is characterized in that comprising: channel estimator, phase calculator and phase sequence detector, wherein,

Described channel estimator is used for carrying out channel estimating respectively according to the Midamble sign indicating number and the SYNC-DL sign indicating number of the TD-SCDMA subframe that receives;

Described phase calculator is used for calculating according to two channel estimation results that described channel estimator obtains the absolute phase information of the SYNC-DL sign indicating number of this subframe;

Described phase sequence detector is used for the absolute phase information of the SYNC-DL sign indicating number that continuous subframes calculated according to described phase calculator, judges the position of PCCPCH;

Wherein, described phase calculator is further used for two channel estimation results that described channel estimator obtains are carried out conjugate multiplication and add up, and obtains accumulated value, calculates the phase place of gained accumulated value again, obtains the absolute phase information of the SYNC-DL sign indicating number of this subframe.

17. checkout gear as claimed in claim 16 is characterized in that, described phase sequence detector specifically comprises: phase place hard decision unit, sequence synthesis unit and sequence comparing unit, wherein,

Described phase place hard decision unit is used for the absolute phase of the SYNC-DL sign indicating number of subframe is carried out hard decision, output phase hard decision result;

Described sequence synthesis unit is used for the synthetic synthesis phase sequence of the court verdict of described phase place hard decision unit;

Described sequence comparing unit is used for synthesis phase sequence and particular phases sequence that described sequence synthesis unit is synthetic and compares, and judges the position of PCCPCH according to comparative result.

18. checkout gear as claimed in claim 16 is characterized in that, described phase sequence detector specifically comprises: relative phase computing unit, phase place hard decision unit, sequence synthesis unit and sequence comparing unit, wherein,

Described relative phase computing unit is used for the phase place of the SYNC-DL sign indicating number of the last subframe of current subframe is deducted the phase place of the SYNC-DL sign indicating number of current subframe, obtains the relative phase of the SYNC-DL sign indicating number of current subframe;

Described phase place hard decision unit is used for the relative phase of the SYNC-DL sign indicating number of subframe is carried out hard decision, output phase hard decision result.

Described sequence synthesis unit is used for the synthetic synthesis phase sequence of the court verdict of described phase place hard decision unit;

Described sequence comparing unit is used for synthesis phase sequence and particular phases sequence that described sequence synthesis unit is synthetic and compares, and judges the position of PCCPCH according to comparative result.

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