CN1553586A - Descending synchronous calibrating method and apparatus for TD-SCDMA system - Google Patents
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Abstract
This invention provides a down stream synchronous calibration method in TD-SCDMA system and its device. It includes following steps: receiving down stream signal. Looking up the down stream SYNC_DL to control the synchronous timing; using the midamble code of the above received signal to calculate the channel impulse response to regulate the synchronous timing; getting the channel impulse response and multiple correlation corresponding to DwPTS channel; getting the left edge of the channel impulse response to get the amount for regulating the synchronous timing calibration; further regulating and calibrating the synchronous timing. The device comprises: receiving device ; looking up device; control and calculation device; regulating device.
Description
Technical field
The present invention relates to mobile communication, relate in particular to down-going synchronous calibration steps and device in a kind of TD-SCDMA system.
Background technology
In the spread spectrum communication, receiver need guarantee at first that the PN sequence of local pseudo noise code (PN) sequence that produces and received signal was synchronous fully before the beginning demodulated received signal, obtain synchronous PN sequence by catching and follow the tracks of 2 stages usually.Obtain the coarse synchronization of PN sign indicating number sequence at acquisition phase, the phase difference that makes PN sequence between transceiver is less than a certain thresholding, and this thresholding is by the capture zone decision of timing tracking cell, time of half-chip width normally in the system of reality.
The initial synchronisation of cdma communication system receiver comprise the PN sign indicating number synchronously, sign synchronization, frame synchronization and scrambler be synchronous etc.The CDMA2000 system adopts and the similar initial synchronisation technology of IS-95 system, and is promptly by catching of pilot channel being set up the synchronous and sign synchronization of PN sign indicating number, synchronous by the reception foundation and the scrambler of synchronizing channel.The initial synchronisation of WCDMA system then needs synchronously " three step prize laws " to carry out, promptly by catching of basic synchronization channel being set up the synchronous and sign synchronization of PN sign indicating number, by incoherent reception to the different spreading codes of auxiliary synchronization channel, determine scrambler group number etc., by possible scrambler is carried out exhaustive search, it is synchronous to set up scrambler at last.
The initial synchronisation of TD-SCDMA system also is divided into three steps: promptly at DwPTS time slot search descending synchronous code SYNC_DL, determine training sequence (Midamble sign indicating number) and set up Primary Common Control Physical Channel (PCCPCH) synchronous.Search SYNC_DL sign indicating number generally adopts " characteristics window ", according to the power features (see figure 3) of DwPTS self, can tentatively determine its position.Preliminary position has been arranged, determined the employed synchronous code in sub-district and its position accurately according to the principle of matched filter again.And in the process of determining the midamble sign indicating number, then can finish the further adjustment of down-going synchronous simultaneously.
After the acquisition procedure of pseudo-random signal finishes, the timing accuracy of local pseudo-random signal is usually at a chip in the time in the receiver, after the communication beginning, should further improve this estimation and make it to be tending towards 0, because the relative motion of transmitter and receiver and the instability of clock, must constantly carry out this process tracing process that is otherwise known as to pseudo-random signal correction work regularly.
Downlink synchronization tracking process in the cdma communication system generally is to utilize the basic training sequences sign indicating number of down channel, normally utilize basic training sequences calculating channel impulse response, calculate according to this impulse response then and follow the tracks of adjustment amount synchronously, be used to adjust synchronization timing and realize synchronous tracing process.
For the CDMA2000 system, basic training sequence is positioned at F-PICH (forward pilot sequence); For the WCDMA system, basic training sequence is positioned at CPICH (Common Pilot Channel), and for the TD-SCDMA system, basic training sequence is positioned at the Midamble of each time slot.But with respect to the basic training sequences in CDMA2000 and the WCDMA system, the midamble training sequence of TD-SCDMA system has bigger difference, and the training sequence of TD-SCDMA system (midamble) is to be used for distinguishing different user in same cells, the identical time slot.The user has identical basic midamble sign indicating number sequence in the same time slot of same sub-district, the midamble sequence of different user is the time shift of basic training sequences, the different employed midamble of channel of same time slot produces (except the Common mode) by this basic midamble sign indicating number via cyclic shift, therefore the channel impulse response that is calculated according to midamble sign indicating number training sequence is actual is that channel impulse response displacement by different channels is formed by stacking, and this point is different with the WCDMA system with CDMA2000.Fig. 1 is the schematic diagram of the channel impulse response that calculated according to the midamble sign indicating number in the TD-SCDMA system.
The existing synchronization scenario of TD-SCDMA system generally comprises two steps:
A) slightly adjust synchronously: at cell initial search with heavily search the stage, keep synchronously by search DwPTS and Node B, synchronous precision can be controlled within 1chip at this moment, and the position calculation according to DwPTS goes out the down-going synchronous timing difference then, and then controls synchronization timing.
B) essence is adjusted synchronously: after slightly finishing synchronously, utilize the midamble sign indicating number in each business time-slot to come the calculating channel impulse response, and according to the time of origin of the peak value of this channel impulse adjust synchronization timing with guarantee with between Node B synchronously.This step can be by differential technique to obtain higher synchronization accuracy.
The existing synchronous adjustment scheme of TD-SCDMA system, adjust two steps synchronously by thick the adjustment synchronously with essence, under certain situation, can obtain good net synchronization capability really, but be subjected to the restriction of the own characteristic of midamble sign indicating number, as mentioned above, under the situation beyond the Common of the midamble sign indicating number method of salary distribution, calculate by the midamble yardage and to obtain channel impulse response and be actually the channel impulse response that comprised a plurality of users of a plurality of channels, when we can not carry out the strictness differentiation to the channel impulse response of these different channels or different user, the net synchronization capability of this method can be subjected to certain influence, therefore in order to overcome this problem, we must seek the approach of dealing with problems outside the Midamble sign indicating number.
Summary of the invention
The objective of the invention is shortcoming, down-going synchronous calibration steps and device in a kind of TD-SCDMA system are provided, to obtain good synchronization performance at above-mentioned prior art.
Down-going synchronous calibration steps in a kind of TD-SCDMA of the present invention system comprises step:
Receive downstream signal;
In the downstream signal that receives, the descending synchronous code (SYNC_DL) in the searching downlink synchronization slot (DwPTS) is to obtain the down-going synchronous timing difference, the control synchronization timing;
Utilize the training sequence midamble sign indicating number in each business time-slot of signal of described reception to come the calculating channel impulse response, and adjust synchronization timing according to the time of origin of the peak value of this channel impulse;
According to the signal that receives, obtain the channel impulse response or the channel multiple correlation of DwPTS channel correspondence;
According to described channel impulse response or channel multiple correlation, obtain the left margin of described channel impulse response, to obtain the adjustment amount of synchronization timing calibration;
According to described adjustment amount, further adjust and/or calibrate described synchronization timing.
Alternatively, the channel impulse response of the described DwPTS of obtaining channel correspondence or the step of channel multiple correlation comprise: the subframe of every interval first predetermined number, and according to channel impulse response of DwPTS channel calculation or channel multiple correlation.
Preferably, the channel impulse response of the described DwPTS of obtaining channel correspondence or the step of channel multiple correlation also comprise: repeat the predetermined subframe in described every interval, according to step the second predetermined number of channel impulse response of DwPTS channel calculation or channel multiple correlation, obtain the channel impulse response or the channel multiple correlation of described second predetermined number; The described channel impulse response of second predetermined number of the described acquisition of cumulative mean or channel multiple correlation.
Alternatively, described first predetermined number is 8 or 16; And/or described second predetermined number is 8 or 16.
Preferably, the adjustment amount of described acquisition synchronization timing calibration satisfies: Δ=w
l-32;
Wherein, Δ is the adjustment amount of synchronization timing calibration; w
lLeft margin for channel impulse response; " 32 " are the left margin reference position of channel impulse response.
Alternatively, the described step of obtaining the left margin of described channel impulse response comprises:
According to described relevant estimation, the footpath of the 3rd predetermined number that the search energy is the strongest is as the position candidate of energy window left margin;
Obtain energy in the footpath of the 3rd the strongest predetermined number of described energy and be the footpath of surviving greater than the footpath of described predetermined threshold, wherein, described predetermined threshold is the function in footpath maximum in the footpath of the 3rd the strongest predetermined number of described energy;
The position that obtains the most left footpath in the described footpath of surviving is the left margin of window.
Preferably, described predetermined threshold is that the 4th predetermined number is removed in footpath maximum in the footpath of the 3rd the strongest predetermined number of described energy.
Alternatively, described the 3rd predetermined number is 6; And/or described the 4th predetermined number is 2.
Down-going synchronous calibrating installation in a kind of TD-SCDMA of the present invention system comprises:
Receiving system is used to receive downstream signal;
Searcher is used at the downstream signal that receives, and the descending synchronous code (SYNC_DL) in the searching downlink synchronization slot (DwPTS) is to obtain the down-going synchronous timing difference, the control synchronization timing;
The control calculation element utilizes the training sequence (midamble sign indicating number) in each business time-slot of signal of described reception to come the calculating channel impulse response, and adjusts synchronization timing according to the time of origin of the peak value of this channel impulse; According to the signal that receives, obtain the channel impulse response or the channel multiple correlation of DwPTS channel correspondence; According to described channel impulse response or channel multiple correlation, obtain the left margin of described channel impulse response, to obtain the adjustment amount of synchronization timing calibration;
Adjusting device is used for according to described adjustment amount, further adjusts and/or calibrate described synchronization timing.
Alternatively, described control and calculation element comprise the control searcher, are used to search for the position candidate of the strongest footpath of the energy of predetermined number as the energy window left margin;
Comparison means is used for the strongest footpath and the predetermined threshold of energy of more described predetermined number, and exports the footpath greater than described predetermined threshold;
Choice device, being used for selecting in described footpath greater than described predetermined threshold, the position in left footpath is the left margin of window.
The present invention improves the smart strategy of adjusting synchronously of prior art, and the scope of its adjustment is limited, and greatly reduces mistuning so that loses synchronous probability, effectively raises the performance of system.
Description of drawings
Fig. 1 has described the schematic diagram of time slot power feature of the DwPTS of TD-SCDMA system;
Fig. 2 is the schematic diagram of the channel impulse response that calculated according to the midamble sign indicating number in the TD-SCDMA system;
Fig. 3 has described TD-SCDMA system subframe structure schematic diagram;
Fig. 4 has described the DwPTS structure of time slot schematic diagram of the TD-SCDMA system subframe among Fig. 3;
Fig. 5 has provided the schematic diagram of the time variation of channel impulse response;
Fig. 6 is the synchronous tracking calibration general flow chart of embodiments of the invention;
Fig. 7 is of the present invention as determining the flow chart of energy window left margin in the flow chart of Fig. 6.
Embodiment
Implement and understand the present invention for the ease of persons skilled in the art, describe method and apparatus of the present invention with reference to accompanying drawing by embodiment respectively below.
The TD-SCDMA system has defined 4 kinds of time slot types altogether, and they are DwPTS, UpPTS, GP and TS0-TS6 (referring to Fig. 3).Wherein DwPTS and UpPTS are used separately as uplink synchronous and down-going synchronous, not carrying user data.The DwPTS time slot is used for transmitting downstream synchronous code (SYNC_DL), and its slot length is 96chips, and wherein code length is 64chips synchronously, as shown in Figure 4.The channel that sends descending synchronous code also is called descending synchronous signal channel (DwPCH).Notice that the DwPTS time slot does not have code division multiplexing, that is to say that this time slot only has a physical channel DwPCH., this point is similar with the Common Pilot Channel in CDMA2000 and the WCDMA system, and the calculating channel impulse response can be avoided the interference of other channels or other subscriber channel impulse responses in view of the above.Therefore can utilize these characteristics of DwPTS time slot that synchronous adjustment of essence limited and calibrated.The present invention utilizes these characteristics to realize.
These characteristics based on the DwPTS time slot, the present invention on the basis of existing technology, in the synchronous adjustment process of essence or after the process, introducing is with this process of step calibration, the adjustment interval that this process utilizes the DwPTS sign indicating number that essence is adjusted is synchronously limited and is calibrated, basically avoid single utilization midamble sign indicating number to carry out the intrinsic problem that smart adjustment is synchronously brought, thereby improved existing performance of following the tracks of synchronously to greatest extent.
The main purpose of considering synchronous tracking in addition is to be used to overcome because the relative motion of transmitter and receiver and the synchronism deviation that instability caused of clock, and the amplitude of variation of these two kinds of synchronism deviations that reason caused and speed are normally more slowly, and simultaneously because the existence of channel fading and multipath, when also being, the channel impulse response that we obtained becomes, shown in the example of Fig. 5.In the moment 1, there are 3 footpaths in a certain channel impulse response, and wherein footpath A is directly main, and other two footpath is time footpath or noise jamming; And 2 o'clock constantly, main footpath A produces decline for a certain reason, this moment, time footpath B transferred most powerful path to, if but adjust synchronously according to footpath B this moment obviously is insecure, because footpath B is time footpath even noise, if carry out the synchronization timing adjustment in view of the above, just main footpath A might be pushed into another user's channel impulse window, can cause adverse influence to the performance of whole system like this, in order to increase the reliability of channel impulse response, simultaneously in order to reduce the influence of false footpath or weak footpath to net synchronization capability, need be in sufficiently long a period of time repeatedly channel impulse response be averaged, amount of calculation expense when considering specific implementation in addition, in fact there is no need each time slot or subframe DwPTS is carried out channel estimating one time, on the contrary, can carry out intermittent channel estimating to it with certain cycle, and then the result of these channel estimating carried out repeatedly average, the adjustment amount that calculates synchronization timing according to averaged result is with to adjusting synchronously or calibrating at last.
By these analyses, the present invention realizes by following concrete approach:
A) every M1 subframe (M1＞=1 gets 8 or 16 in an embodiment of the present invention), according to channel impulse response of DwPTS channel calculation or channel multiple correlation corr.
B) repetition said process M2 (M2＞=1 gets 8 or 16 in an embodiment of the present invention) is inferior, and the energy pow of channel impulse response or multiple correlation is carried out cumulative mean.
C), judge the left margin w of this channel impulse response according to channel impulse response after the cumulative mean or multiple correlation energy pow
l
D) according to the left margin position of channel impulse response, calculate the adjustment amount Δ of synchronization timing calibration.
Δ＝w
l-32 (0.1)
E), adjust or the calibration synchronization timing according to the adjustment amount Δ of synchronization timing calibration.
In an embodiment of the present invention, described channel impulse response or multiple correlation are calculated to adopt and are asked following mode to realize: begin to get the 128chips data from the DwPTS approximate location
r, wherein k element representation is r
k, complex value SYNC_DL sign indicating number is s, wherein k element representation is s
k, k=0 ... 63, calculate the multiple correlation power of received signal and corresponding SYNC_DL sign indicating number.In embodiment 1, multiple correlation adopts directly and calculates, and in embodiment 2, realizes by FFT+IFFT.
A) embodiment 1: directly calculate multiple correlation:
In the formula: * represents to get conjugation, k=0 ... 63.
B) embodiment 2: calculate multiple correlation by FFT+IFFT:
Behind the SYNC_DL sign indicating number, mend 64 0 earlier, calculate multiple correlation again
corr＝IFFT(FFT(r).FFT(s)
*). (0.3)
Corresponding multiple correlation result's energy sequence is calculated as follows:
pow
k＝‖corr
k‖
2 (0.4)
In the formula: ‖ ‖
2Expression modulus of complex number side, k=0 ... .63.
In an embodiment, relevant results estimated is 128 points, but N point channel estimation value is just much of that before the actual only reservation, can save a part of memory space like this, gets the N=64 point in an embodiment.
Described channel impulse response or multiple correlation left margin are judged, realize in the following way:
1) from this channel impulse response or multiple correlation energy sequence, finds the strong footpath of maximum L (according to the average energy in each footpath).
p＝max_l(pow) (0.5)
Wherein L can decide according to the situation of specific implementation, and suggestion is made as 4 footpaths or 6 footpaths.
2) calculate effective diameter thresholding η according to the most powerful path energy
η＝max(p)/n，(n≥1) (0.6)
Consider the cross correlation that the SYNC_DL sign indicating number is poor, this thresholding can be made as 1/2 or 1/3 etc. of strong footpath energy.
3) according to effective diameter threshold value η, remove the interference footpath in the strong footpath of L, the footpath p% that survives can be expressed as.
p％＝{p
k|p
k＞η} (0.7)
4) minimum value of chosen position sequence number from the footpath p% that survives is as the left margin position w of channel impulse response window
l
w
l＝{k|min?inp％} (0.8)
Simultaneously in order to reduce the probability of smart mistuning synchronously, existing smart simultaneous techniques is increased following restriction: in the process of two subsynchronous calibrations, be used to control smart synchronization timing adjust total amount less than K (1=＜K＜W/2, W is long for the channel impulse response window, the recommended value of K is 1〉chip.
Understand and enforcement the present invention for the ease of persons skilled in the art, further describe the present invention below in conjunction with embodiment and accompanying drawing.
Fig. 6 is the synchronous tracking calibration general flow chart of embodiments of the invention.In this flow chart, be example with TD-SCDMA system (time-division-synchronization code multi-address division system), illustrated in this system, the basic procedure of synchronous tracking calibration, wherein major parameter is provided with as follows: M1=16, M2=8, N=64, L=6, η=1/2.
In step 1, judge at first whether synchronous calibration command is effective, if effectively, execution in step 2, otherwise continue to wait for.
In step 2, sub-frame count device and channel estimation results are resetted, be about to frame counter, channel estimating zero setting; Thereby prepare for a series of activities of back.
In step 3, each subframe needs at first to judge that whether the sub-frame count device is 16 multiple, if 16 multiple, execution in step 4 so, otherwise continue to wait for.
In step 4, carry out the operation of relevant estimation and energy accumulation, in an embodiment of the present invention, associative operation adopts the FFT/IFFT mode to realize, preceding 64 spot correlations are estimated to add up operation.
In step 5, after step 4 is finished, judge whether the sub-frame count device is the multiple of 128 (M1*M2=16*8=128), if 128 multiple, then execution in step 6, otherwise get back to step 3.
In step 6, at first calculate the left margin of relevant estimating window, and then according to the adjustment amount Δ of the position calculation synchronization timing of left margin calibration, last adjustment amount Δ according to the synchronization timing calibration, adjust or the calibration synchronization timing, at last relevant estimated result is carried out zero clearing, finish a synchronous calibration loop.
In step 7, judge whether effectively with step calibration the finish command, if not imitate, continue execution in step 2-6, otherwise, finish this process.
Fig. 7 is a detail flowchart of determining energy window left margin process as step 6 in the flow chart of Fig. 6 of the present invention.Wherein in step 710, at first estimate that according to relevant the result who adds up searches for the position candidate of 6 the strongest footpaths of energy as back energy window left margin;
In step 720, according to the maximum of the 6 footpath energy that calculate in the step 710 thresholding of effective diameter is set, we are made as peaked 1/2 with this threshold value in this example;
In step 730, according to the threshold value that is calculated in the step 720, judge the validity in 6 footpaths, suppose in this 6 footpath, to have only the 2nd, 3 footpath to satisfy this condition, the footpath of surviving so only comprises this two footpath.
In step 740, according to the position of the effective diameter of being judged in the step 730, the searching position sequence number with the left margin of its sequence number as the correlation energy window, supposes that the minimum position sequence number is 33, so left margin w by a little footpath
lBe 33.
Adjustment amount Δ=the w of synchronization timing calibration this moment
l-32=1 illustrates that current synchronization timing is offset 1 chip backward, and then this moment, we need adjust synchronization timing forward 1 chip lengths.
Down-going synchronous calibrating installation of the present invention comprises: receiving system is used to receive downstream signal; Searcher is used at the downstream signal that receives, and the descending synchronous code (SYNC_DL) in the searching downlink synchronization slot (DwPTS) is to obtain the down-going synchronous timing difference, the control synchronization timing; The control calculation element utilizes the midamble sign indicating number in each business time-slot of signal of described reception to come the calculating channel impulse response, and adjusts synchronization timing according to the time of origin of the peak value of this channel impulse; According to the signal that receives, obtain the channel impulse response or the channel multiple correlation of DwPTS channel correspondence; According to described channel impulse response or channel multiple correlation, obtain the left margin of described channel impulse response, to obtain the adjustment amount of synchronization timing calibration; Adjusting device is used for according to described adjustment amount, further adjusts and/or calibrate described synchronization timing.Wherein, described control and calculation element comprise the control searcher, are used to search for the position candidate of the strongest footpath of the energy of predetermined number as the energy window left margin; Comparison means is used for the strongest footpath and the predetermined threshold of energy of more described predetermined number, and exports the footpath greater than described predetermined threshold; Choice device, being used for selecting in described footpath greater than described predetermined threshold, the position in left footpath is the left margin of window.
Utilize the present invention, by introducing with this process of step calibration, the adjustment interval that this process utilizes the DwPTS sign indicating number that essence is adjusted is synchronously limited and is calibrated, basically avoid single utilization midamble sign indicating number to carry out the intrinsic problem that smart adjustment is synchronously brought, thereby improved existing performance of following the tracks of synchronously to greatest extent.
Utilize the present invention,, and carry out same step calibration, effectively overcome the influence of channel fading net synchronization capability according to mean value by the multiple averaging of carrying out to the channel impulse response that obtains according to the DwPTS yardage.
The present invention improves the smart strategy of adjusting synchronously of prior art, and the scope of its adjustment is limited, and greatly reduces mistuning so that loses synchronous probability, effectively raises the performance of system.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (10)
1. the down-going synchronous calibration steps in the TD-SCDMA system comprises step:
Receive downstream signal;
In the downstream signal that receives, the descending synchronous code (SYNC_DL) in the searching downlink synchronization slot (DwPTS) is to obtain the down-going synchronous timing difference, the control synchronization timing;
Utilize the training sequence midamble sign indicating number in each business time-slot of signal of described reception to come the calculating channel impulse response, and adjust synchronization timing according to the time of origin of the peak value of this channel impulse;
According to the signal that receives, obtain the channel impulse response or the channel multiple correlation of DwPTS channel correspondence;
According to described channel impulse response or channel multiple correlation, obtain the left margin of described channel impulse response, to obtain the adjustment amount of synchronization timing calibration;
According to described adjustment amount, further adjust and/or calibrate described synchronization timing.
2. the channel impulse response of the method for claim 1, wherein described DwPTS of obtaining channel correspondence or the step of channel multiple correlation comprise: the subframe of every interval first predetermined number, and according to channel impulse response of DwPTS channel calculation or channel multiple correlation.
3. method as claimed in claim 2, wherein, the channel impulse response of the described DwPTS of obtaining channel correspondence or the step of channel multiple correlation also comprise: repeat the predetermined subframe in described every interval, according to step the second predetermined number of channel impulse response of DwPTS channel calculation or channel multiple correlation, obtain the channel impulse response or the channel multiple correlation of described second predetermined number; The described channel impulse response of second predetermined number of the described acquisition of cumulative mean or channel multiple correlation.
4. as claim 2 or 3 described methods, wherein, described first predetermined number is 8 or 16; And/or described second predetermined number is 8 or 16.
5. as the described method of one of claim 1-3, wherein, the adjustment amount of described acquisition synchronization timing calibration satisfies: Δ=w
l-32;
Wherein, Δ is the adjustment amount of synchronization timing calibration; w
lLeft margin for channel impulse response; " 32 " are the left margin reference position of channel impulse response.
6. as the described method of one of claim 1-3, wherein, the described step of obtaining the left margin of described channel impulse response comprises:
According to described relevant estimation, the footpath of the 3rd predetermined number that the search energy is the strongest is as the position candidate of energy window left margin;
Obtain energy in the footpath of the 3rd the strongest predetermined number of described energy and be the footpath of surviving greater than the footpath of described predetermined threshold, wherein, described predetermined threshold is the function in footpath maximum in the footpath of the 3rd the strongest predetermined number of described energy;
The position that obtains the most left footpath in the described footpath of surviving is the left margin of window.
7. method as claimed in claim 6, wherein, described predetermined threshold is that the 4th predetermined number is removed in footpath maximum in the footpath of the 3rd the strongest predetermined number of described energy.
8. method as claimed in claim 7, wherein, described the 3rd predetermined number is 6; And/or described the 4th predetermined number is 2.
9. the down-going synchronous calibrating installation in the TD-SCDMA system comprises:
Receiving system is used to receive downstream signal;
Searcher is used at the downstream signal that receives, and the descending synchronous code (SYNC_DL) in the searching downlink synchronization slot (DwPTS) is to obtain the down-going synchronous timing difference, the control synchronization timing;
The control calculation element utilizes the training sequence (midamble sign indicating number) in each business time-slot of signal of described reception to come the calculating channel impulse response, and adjusts synchronization timing according to the time of origin of the peak value of this channel impulse; According to the signal that receives, obtain the channel impulse response or the channel multiple correlation of DwPTS channel correspondence; According to described channel impulse response or channel multiple correlation, obtain the left margin of described channel impulse response, to obtain the adjustment amount of synchronization timing calibration;
Adjusting device is used for according to described adjustment amount, further adjusts and/or calibrate described synchronization timing.
10. device as claimed in claim 9, wherein, described control and calculation element comprise the control searcher, are used to search for the position candidate of the strongest footpath of the energy of predetermined number as the energy window left margin;
Comparison means is used for the strongest footpath and the predetermined threshold of energy of more described predetermined number, and exports the footpath greater than described predetermined threshold;
Choice device, being used for selecting in described footpath greater than described predetermined threshold, the position in left footpath is the left margin of window.
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