CN101854704B - TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) cell search method and terminal equipment - Google Patents
TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) cell search method and terminal equipment Download PDFInfo
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- CN101854704B CN101854704B CN2010101756747A CN201010175674A CN101854704B CN 101854704 B CN101854704 B CN 101854704B CN 2010101756747 A CN2010101756747 A CN 2010101756747A CN 201010175674 A CN201010175674 A CN 201010175674A CN 101854704 B CN101854704 B CN 101854704B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) cell search method and terminal equipment, relating to the field of communication. The TD-SCDMA cell search method comprises the following steps of: starting to carry out coarse frequency offset estimation when downlink synchronous codes are detected; directly detecting training sequence codes after the detection of the downlink synchronous codes is completed without confirming the downlink synchronous codes, and continuously carrying out the coarse frequency offset estimation when the training sequence codes are detected. The invention can effectively reduce the computation amount and the processing time, thereby greatly reducing the consuming time of TD-SCDMA cell search and the power consumption in the cell search process and enhancing the cell search performance.
Description
Technical field
The present invention relates to the communications field, particularly the Cell searching technology in the communications field.
Background technology
TD SDMA (Time Division Synchronous CodeDivision MultipleAccess SCDMA, be called for short " TD-SCDMA ") as the 3-G (Generation Three mobile communication system) standard that is proposed by China, combine a series of new and high technologies such as time division duplex, code division multiple access, joint-detection, smart antenna, baton handover, have the characteristics such as the availability of frequency spectrum is high, development cost is low, the asymmetric transmission of adaptation, have broad application prospects.Transmission reception technique in the TD-SCDMA system can be also 11061257 United States Patent (USP) referring to the patent No..
In the mobile communcations system that comprises the TD-SCDMA system, at first mobile terminal needs to carry out Cell searching after start, after searching the residential quarter, after registering on the residential quarter, just can carry out normal mobile service.
At present, the handling process of existing TD-SCDMA Cell searching as shown in Figure 1.
In step 110, terminal is carried out frequency sweep to each carrier wave.
Then, in step 120, terminal is carried out thick synchronous estimation according to the frequency sweep result.
Then, in step 130, terminal is carried out the detection of descending synchronous code (SyncDl code).
Then, in step 140, terminal is carried out thick frequency deviation and is estimated.
Then, in step 150, terminal is carried out the confirmation of SyncDl code.
Then, in step 160, terminal is carried out the detection of basic training sequences code (Basic Middleamble code).
Then, in step 170, terminal is carried out smart frequency deviation and is estimated.
Then, in step 180, terminal is carried out broadcast channel (BCH) and separate to be in harmonious proportion the BCH subframe that initially interweaves and to detect.
This shows that the cell search process under existing TD-SCDMA generally needs 8 steps, from step 110 to step 180, after being successfully completed step 180, just begin complete read apparatus message, and register on the residential quarter, complete the initialization procedure of whole terminal.
Yet the present inventor finds, in the flow process of above-mentioned TD-SCDMA Cell searching, if each step failure will stop the detection of current carrier wave and begin to search for other carrier waves, perhaps restarts the detection of next circulation; And the error detection probability of most modules is very high, it is not the BCH carrier wave that whole flow process usually needs to run to the carrier wave that step 180 just can rule out current detection, the TD-SCDMA Cell searching is consuming time long, and the power consumption of terminal is larger, in the situation that weak signal or wireless environment relatively worsen, mobile terminal can't search out current Serving cell in the short time.
Summary of the invention
The object of the present invention is to provide a kind of TD-SCDMA small region search method and terminal equipment, effectively reduce operand and processing time in the TD-SCDMA cell search process, thereby the time that makes the TD-SCDMA Cell searching expend greatly reduces, the power-dissipation-reduced in cell search process.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of TD-SCDMA small region search method, comprise following steps:
Terminal is carried out thick frequency deviation estimation for the first time when carrying out the descending synchronous code detection;
In the detection of completing descending synchronous code with after thick frequency deviation is estimated for the first time, terminal is directly carried out the detection of training sequence code, and when carrying out the training sequence code detection, carries out thick frequency deviation estimation for the second time;
Terminal carries out that follow-up smart frequency deviation is estimated, broadcast channel BCH initially interweaves, and subframe detects and the BCH demodulation, completes the search of TD SDMA TD-SCDMA residential quarter.
Embodiments of the present invention also provide a kind of terminal equipment, comprise descending synchronous code detection module, thick frequency deviation estimating modules, training sequence code detection module, smart frequency deviation estimating modules, subframe detection module and BCH demodulation module;
The descending synchronous code detection module is used for carrying out the detection of descending synchronous code, and when carrying out the descending synchronous code detection, triggers thick frequency deviation estimating modules and carry out thick frequency deviation estimation for the first time;
The training sequence code detection module is used for completing at the descending synchronous code detection module detection of descending synchronous code, and thick frequency deviation estimating modules is completed when thick frequency deviation is estimated for the first time, directly carry out the detection of training sequence code, and when carrying out the training sequence code detection, trigger thick frequency deviation estimating modules and carry out thick frequency deviation estimation for the second time;
The essence frequency deviation estimating modules is used for carrying out smart frequency deviation and estimating after thick frequency deviation estimating modules is completed thick frequency deviation estimation for the second time;
The subframe detection module is used for completing after thick frequency deviation is estimated for the second time in thick frequency deviation estimating modules, carries out the broadcast channel BCH subframe that initially interweaves and detects;
The BCH demodulation module is used for carrying out the BCH demodulation after thick frequency deviation estimating modules is completed thick frequency deviation estimation for the second time.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
When carrying out the descending synchronous code detection, namely begin to carry out thick frequency deviation and estimate; Need not to carry out the confirmation of descending synchronous code after the detection of completing descending synchronous code, but directly carry out the detection of training sequence code, and when carrying out the training sequence code detection, proceed thick frequency deviation and estimate.After descending synchronous code (SyncDl) code and training sequence code (Basic Middleamble) detection, accurate multipath information can be provided, and thick frequency deviation need to estimate these information, if thick frequency deviation estimates to be set to independent step, need again multipath information to be detected, therefore thick frequency deviation is estimated to be divided into 2 parts, and integrate with SyncDl and detect and Basic Middleamble code detecting step, can effectively reduce operand and processing time.And due to when carrying out the descending synchronous code detection, carried out primary thick frequency deviation and estimated, guaranteed the accuracy of the descending synchronous code of detection, therefore can dispense the confirmation step of the descending synchronous code in former flow process.Thereby greatly reduced the time that the TD-SCDMA Cell searching expends, reduced the power consumption in the cell search process, and the Cell searching performance will be improved, in the situation that under weak signal or wireless environment relatively worsen, mobile terminal still can search out current Serving cell in the short time.
Further, follow-up smart frequency deviation is estimated, BCH initially interweaves, and subframe detects and the BCH demodulation, can carry out simultaneously.Because smart frequency deviation is estimated, the subframe that initially interweaves BCH detects and the BCH demodulation, all demodulation PCCPCH physical channel in fact, so can merge into a step to these several steps, and process simultaneously, operand and processing time can effectively be reduced like this, reduce power consumption, and owing to repeatedly doing same thing, abnormal possibility once to occur once large than only doing abnormal possibility to occur once, therefore smart frequency deviation estimation, BCH initially being interweaved, subframe detects and a step is merged in the BCH demodulation, can also effectively improve performance.
Further, also can be after completing smart frequency deviation and estimating, then carry out simultaneously the BCH subframe that initially interweaves and detect and the BCH demodulation, make technical scheme of the present invention can with prior art compatibility preferably.
Description of drawings
Fig. 1 is the process chart according to TD-SCDMA Cell searching of the prior art;
Fig. 2 is the TD-SCDMA small region search method flow chart according to first embodiment of the invention;
Fig. 3 is the TD-SCDMA small region search method flow chart according to second embodiment of the invention;
Fig. 4 is the TD-SCDMA small region search method flow chart according to third embodiment of the invention;
Fig. 5 is the terminal equipment structural representation according to four embodiment of the invention.
Embodiment
In the following description, in order to make the reader understand the application better, many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
First embodiment of the invention relates to a kind of TD-SCDMA small region search method, idiographic flow such as Fig. 2.
In step 210, terminal is namely carried out frequency sweep (PowerSweep) to each carrier wave to carrying out frequency sweep in being with, take WKHz as step-length, detect the power in the 1.6MHz band on each carrier frequency point, step-length WKHz can be 200KHz, 400KHz, 600KHz, 800KHz etc.; And sort by watt level.
Then, in step 220, terminal according to power from big to small, is carried out thick synchronous estimation according to the frequency sweep result.Particularly, terminal can be passed through descending pilot frequency time slot (Downlink Pilot Time Slot, be called for short " DwPTS ") power features of position, detect the thick synchronizing information of its TD-SCDMA subframe, the specific implementation details can be the patent application of " 2010101392223 " referring to application number.
Then, in step 230, terminal detects descending synchronous code (SyncDl code), detect the smart synchronizing information of respective cell, and when carrying out the descending synchronous code detection, carrying out thick frequency deviation estimation for the first time, this thick frequency deviation estimated service life SyncDl code pilot frequency sequence is processed.
Specifically, in the present embodiment, thick frequency deviation is estimated to decompose, when detecting the SyncDl code, namely begin to carry out thick frequency deviation and estimate.Owing to comprising 32 groups of SyncDl codes at TD-SCDMA, by being correlated with to each SyncDl code book ground sequence, can detect the SyncDl code (having in the common frequency multi-cell situation, can detect a plurality of SyncDl codes) of residential quarter, the multipath information of residential quarter and the synchronizing information of multipath.And thick frequency deviation need equally to estimate these information, therefore can be when carrying out the descending synchronous code detection, beginning primary thick frequency deviation estimates, after detecting first frequency deviation, controlling (Automatic Frequency Control is called for short " AFC ") system by automatic frequency calibrates local crystal oscillator frequency.
Then, in step 240, in the detection of completing descending synchronous code with after thick frequency deviation is estimated for the first time, terminal is directly carried out the detection of training sequence code (Basic Middleamble code), in this step, can adopt application number is that the method for putting down in writing in the patent application of " 2010101372925 " is carried out the detection of BasicMiddleamble code.Terminal is carried out thick frequency deviation estimation for the second time when carrying out the training sequence code detection.
Due to the TD-SCDMA regulation and stipulation, a SyncDl code is corresponding to 4 BasicMiddleamble codes, be correlated with by 4 Basic Middleamble codes to each SyncDl code correspondence, find out its prominent code, (having in the common frequency multi-cell situation detecting Basic Middleamble code corresponding to residential quarter, detect a plurality of SyncDl codes, each SyncDl code is with Basic Middleamble code of correspondence).By this step, which in 4 the BasicMiddleamble code that can detect the carrier wave small area belong to, obtain simultaneously to receive the multipath information of cell signal and synchronous accurately, being used for secondary thick frequency deviation estimates, thick frequency deviation estimated service life Middleamble processes for the second time, and according to the frequency deviation of estimating, by the AFC system, local crystal oscillator frequency is calibrated.In the present embodiment, can adopt application number is that the method for putting down in writing in the patent application of " 2009100577588 " is carried out the estimation of thick frequency deviation.
Then, in step 250, terminal is carried out smart frequency deviation and is estimated.After estimating by thick frequency deviation, the frequency offset of radio frequency of terminal will be controlled in 1kHz, and on the data input and data output link, its frequency deviation need to be controlled in 100Hz, so also need further to arrive frequency offset correction less, method for estimating frequency deviation accurately can use Primary Common Control Physical Channel (Primary Common Control PhysicalChannel, abbreviation " P-CCPCH ") phase deviation of the data championship after demodulation detects, can realize in the prior art, not repeat them here.
Then, in step 260, terminal is carried out broadcast channel BCH and is interweaved initially that subframe detects and the BCH demodulation, completes the search of TD-SCDMA residential quarter.
it will be appreciated by those skilled in the art that, the Transmission Time Interval of BCH channel (TransmissionTiming Interval, abbreviation " TTI ") cycle is 20 milliseconds, so once interweave and encoding-decoding process comprise 4 subframes data, terminal need to detect the initial subframe position of BCH interleaving block, can carry out demodulation to the BCH carrier wave in continuous 4 subframe starting position trials, if cyclic redundancy check (CRC) (Cyclic Redundancy Check, abbreviation " CRC ") verification is accurate, just think that current initial subframe position is the initial subframe of BCH channel interleaving, and if the CRC check of demodulation BCH channel is accurate, can think that this cell search process is successfully completed, next can begin the whole broadcast system message of demodulation.
After descending synchronous code (SyncDl) code and training sequence code (Basic Middleamble) detection, accurate multipath information can be provided, and thick frequency deviation need to estimate these information, if thick frequency deviation estimates to be set to independent step, need again multipath information to be detected, therefore in the present embodiment, thick frequency deviation is estimated to be divided into 2 parts, and integrate with SyncDl and detect and BasicMiddleamble code detecting step, can effectively reduce operand and processing time.And due to when carrying out the descending synchronous code detection, having carried out primary thick frequency deviation estimates, guaranteed the accuracy of the descending synchronous code of detection, therefore can dispense the confirmation step of the descending synchronous code in former flow process, simplified whole flow process, thereby greatly reduced the time that the TD-SCDMA Cell searching expends, reduced the power consumption in the cell search process, and the Cell searching performance will be improved.
Second embodiment of the invention relates to a kind of TD-SCDMA small region search method.The second execution mode improves on the basis of the first execution mode, main improvements are: in the detection of completing the BasicMiddleamble code with after thick frequency deviation is estimated for the second time, and terminal carries out simultaneously that smart frequency deviation is estimated, broadcast channel BCH initially interweaves subframe detection and BCH demodulation.
Idiographic flow as shown in Figure 3, step 310 is identical to step 240 with step 210 respectively to step 340, does not repeat them here.
In step 350, terminal carries out simultaneously that smart frequency deviation is estimated, broadcast channel BCH initially interweaves, and subframe detects and the BCH demodulation.
Because smart frequency deviation is estimated, the subframe that initially interweaves BCH detects and the BCH demodulation, all demodulation PCCPCH physical channel in fact, so can merge into a step to these several steps, and process simultaneously, operand and processing time can effectively be reduced like this, reduce power consumption, and owing to repeatedly doing same thing, abnormal possibility once to occur once large than only doing abnormal possibility to occur once, therefore smart frequency deviation estimation, BCH initially being interweaved, subframe detects and a step is merged in the BCH demodulation, can also effectively improve performance.Certainly, in actual applications, estimate time long (will be longer than the initial subframe position detection time of BCH interleaving block) of expending due to smart frequency deviation, when therefore designing, can first carry out the smart frequency deviation of a period of time and estimate, and adjust the AFC system, after the brilliant frame preliminarily stabilised in this locality, reattempt demodulation BCH transmission channel, judge whether its CRC is accurate, and detect the initial subframe position of BCH interleaving block.
Third embodiment of the invention relates to a kind of TD-SCDMA small region search method.The 3rd execution mode and the second execution mode are basic identical, and the main distinction is: in the second execution mode, thick frequency deviation is estimated to be divided into 2 parts, and integrate with SyncDl and detect and Basic Middleamble code detecting step; And in the present embodiment, thick frequency deviation is estimated to be set to independent step, after being positioned at the detection of descending synchronous code (SyncDl) code, before the detection of Basic Middleamble, as shown in Figure 4.
Each method execution mode of the present invention all can be realized in modes such as software, hardware, firmwares.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the memory of computer-accessible of any type (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium etc.).equally, memory can be for example programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc, be called for short " DVD ") etc.
Four embodiment of the invention relates to a kind of terminal equipment.As shown in Figure 5, this terminal equipment comprises frequency sweep module, thick synchronous estimation module, descending synchronous code detection module, thick frequency deviation estimating modules, calibration module, training sequence code detection module, smart frequency deviation estimating modules, subframe detection module and BCH demodulation module.
Wherein, the frequency sweep module is used for each carrier wave is carried out frequency sweep.Thick synchronous estimation module is used for the frequency sweep result according to the frequency sweep module, carries out slightly synchronously estimating, and after completing thick synchronous estimation, triggering descending synchronous code detection module.The descending synchronous code detection module is used for carrying out the detection of descending synchronous code, and when carrying out the descending synchronous code detection, triggers thick frequency deviation estimating modules and carry out thick frequency deviation estimation for the first time.The training sequence code detection module is used for completing at the descending synchronous code detection module detection of descending synchronous code, and thick frequency deviation estimating modules is completed when thick frequency deviation is estimated for the first time, directly carry out the detection of training sequence code, and when carrying out the training sequence code detection, trigger thick frequency deviation estimating modules and carry out thick frequency deviation estimation for the second time.Calibration module is used for according to the estimated result of thick frequency deviation, local crystal oscillator frequency being calibrated after thick frequency deviation estimating modules is completed thick frequency deviation estimation each time.This calibration module is controlled the AFC system by automatic frequency and is realized.
The essence frequency deviation estimating modules is used for carrying out smart frequency deviation and estimating after thick frequency deviation estimating modules is completed thick frequency deviation estimation for the second time.The subframe detection module is used for completing after thick frequency deviation is estimated for the second time in thick frequency deviation estimating modules, carries out the broadcast channel BCH subframe that initially interweaves and detects.The BCH demodulation module is used for carrying out the BCH demodulation after thick frequency deviation estimating modules is completed thick frequency deviation estimation for the second time.In the present embodiment, smart frequency deviation estimating modules is after completing smart frequency deviation and estimating, indication subframe detection module and BCH demodulation module carry out simultaneously the BCH subframe that initially interweaves and detect and the BCH demodulation.
Be not difficult to find, the first execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the first execution mode.The correlation technique details of mentioning in the first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the first execution mode.
Fifth embodiment of the invention relates to a kind of terminal equipment.The 5th execution mode improves on the basis of the 4th execution mode, main improvements are: smart frequency deviation estimating modules, subframe detection module and BCH demodulation module are completed after thick frequency deviation is estimated for the second time in thick frequency deviation estimating modules, carry out simultaneously that smart frequency deviation is estimated, broadcast channel BCH initially interweaves, and subframe detects and the BCH demodulation.
Be not difficult to find, the second execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the second execution mode.The correlation technique details of mentioning in the second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the second execution mode.
Need to prove, each unit of mentioning in each equipment execution mode of the present invention is all logical block, physically, a logical block can be a physical location, it can be also the part of a physical location, can also realize with the combination of a plurality of physical locations, the physics realization mode of these logical blocks itself is not most important, and the combination of the function that these logical blocks realize is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, above-mentioned each equipment execution mode of the present invention will not introduced not too close unit with solving technical problem relation proposed by the invention, and this does not show that there is not other unit in the said equipment execution mode.
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. a TD-SCDMA small region search method, is characterized in that, comprises following steps:
Terminal is carried out thick frequency deviation estimation for the first time when carrying out the descending synchronous code detection;
After the detection of completing described descending synchronous code and described thick frequency deviation estimation for the first time, described terminal is directly carried out the detection of training sequence code, and when carrying out the training sequence code detection, carries out thick frequency deviation estimation for the second time;
Described terminal carries out that follow-up smart frequency deviation is estimated, broadcast channel BCH initially interweaves, and subframe detects and the BCH demodulation, completes the search of TD SDMA TD-SCDMA residential quarter;
Wherein, described terminal according to the estimated result of thick frequency deviation, is calibrated local crystal oscillator frequency after completing each time thick frequency deviation estimation.
2. TD-SCDMA small region search method according to claim 1, it is characterized in that, the described subframe of carrying out that follow-up smart frequency deviation is estimated, broadcast channel BCH initially interweaves detect and the step of Bch demodulation in, described terminal is first carried out described smart frequency deviation and is estimated, after completing described smart frequency deviation and estimating, then carry out simultaneously the described BCH subframe that initially interweaves and detect and the BCH demodulation.
3. TD-SCDMA small region search method according to claim 1, it is characterized in that, the described subframe of carrying out that follow-up smart frequency deviation is estimated, broadcast channel BCH initially interweaves detect and the step of BCH demodulation in, described terminal carries out simultaneously that described smart frequency deviation is estimated, broadcast channel BCH initially interweaves, and subframe detects and the BCH demodulation.
4. TD-SCDMA small region search method according to claim 1, is characterized in that, described terminal is controlled the AFC system by the automatic frequency in this terminal, carries out the calibration of described local crystal oscillator frequency.
5. the described TD-SCDMA small region search method of any one according to claim 1 to 3, is characterized in that, described terminal also comprised following steps before carrying out the descending synchronous code detection:
Each carrier wave is carried out frequency sweep;
According to described frequency sweep result, carry out thick synchronous estimation.
6. a terminal equipment, is characterized in that, comprises descending synchronous code detection module, thick frequency deviation estimating modules, training sequence code detection module, calibration module, smart frequency deviation estimating modules, subframe detection module and BCH demodulation module;
Described descending synchronous code detection module is used for carrying out the detection of descending synchronous code, and when carrying out the descending synchronous code detection, triggers described thick frequency deviation estimating modules and carry out thick frequency deviation estimation for the first time;
Described training sequence code detection module is used for completing at described descending synchronous code detection module the detection of descending synchronous code, and described thick frequency deviation estimating modules is completed when thick frequency deviation is estimated for the first time, directly carry out the detection of training sequence code, and when carrying out the training sequence code detection, trigger described thick frequency deviation estimating modules and carry out thick frequency deviation estimation for the second time;
Described calibration module is used for according to the estimated result of thick frequency deviation, local crystal oscillator frequency being calibrated after described thick frequency deviation estimating modules is completed thick frequency deviation estimation each time;
Described smart frequency deviation estimating modules is used for carrying out smart frequency deviation and estimating after described thick frequency deviation estimating modules is completed thick frequency deviation estimation for the second time;
Described subframe detection module is used for completing after thick frequency deviation is estimated for the second time in described thick frequency deviation estimating modules, carries out the broadcast channel BCH subframe that initially interweaves and detects;
Described BCH demodulation module is used for carrying out the BCH demodulation after described thick frequency deviation estimating modules is completed thick frequency deviation estimation for the second time.
7. terminal equipment according to claim 6, is characterized in that, described smart frequency deviation estimating modules indicate described subframe detection module and BCH demodulation module to carry out simultaneously described BCH initially interweave subframe detection and BCH demodulation after completing smart frequency deviation and estimating.
8. terminal equipment according to claim 6, it is characterized in that, described smart frequency deviation estimating modules, subframe detection module and BCH demodulation module carry out simultaneously that described smart frequency deviation is estimated, broadcast channel BCH initially interweaves, and subframe detects and the BCH demodulation after described thick frequency deviation estimating modules is completed for the second time thick frequency deviation and estimated.
9. terminal equipment according to claim 6, is characterized in that, described calibration module is controlled the AFC system by automatic frequency and realized.
10. terminal equipment according to claim 6, is characterized in that, described terminal equipment also comprises:
The frequency sweep module is used for each carrier wave is carried out frequency sweep;
Thick synchronous estimation module is used for the frequency sweep result according to described frequency sweep module, carries out slightly synchronously estimating, and after completing thick synchronous estimation, triggers described descending synchronous code detection module.
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| CN102547919B (en) * | 2011-12-26 | 2014-07-02 | 展讯通信（上海）有限公司 | Frequency sweeping method for mobile terminal, frequency sweeping device for same and baseband chip |
| CN108988979B (en) * | 2018-07-10 | 2020-02-21 | 深圳磊诺科技有限公司 | Full-band frequency sweeping method and device and small base station |
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