CN1374770A - Adaptive threshold W-CDMA time interval synchronizing method and device - Google Patents
Adaptive threshold W-CDMA time interval synchronizing method and device Download PDFInfo
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Abstract
The present invention is one kind of fast reliable time interval synchronizing capture method in W-CDMA subzone search and time interval synchronizing device of the said method. From main synchronizing sequence matching result of matched filter, the device selects correlative peaks and correlative position exceeding certain threshold for record and analysis. When correlative peaks in required number repeatedly appear in some indentical position, the synchronizing sequence is judged to be captured, or else the threshold is regulated to next record and analysis course. In case of no synchronizing sequence is captured in specified time, the device exits from the capture course and some capture failure indication is given out.
Description
(1) technical field:
WCDMA (Wideband Code Division Multiple Access (WCDMA)) system of FDD (Frequency Division Duplexing (FDD)) pattern in the 3 g mobile communication system that the present invention relates to is specifically related to the Cell searching technology of MT in the WCDMA system (portable terminal).
(2) background technology:
In Wideband Code Division Multiple Access (WCDMA) (W-CDMA) system, communicating by letter between travelling carriage and base station is based upon on the basis of down-going synchronous, be the timing information that travelling carriage need obtain the base station, comprise chip (chip) regularly, time slot (slot) regularly, frame (frame) regularly and superframe (super frame) regularly.In the W-CDMA system, the regularly synchronous foundation in travelling carriage and base station comprises the process in two stages, and first stage is an initial synchronisation, obtains the base station at this stage travelling carriage and comprises the thick timing regularly of chip timings, slot timing and frame; Second stage is a precise synchronization, and accurate regularly tracking is carried out in the thick timing that travelling carriage obtained according to the initial synchronisation stage, and obtains superframe regularly.Initial synchronization is called Cell searching (cell search) in W-CDMA, this process is divided into three steps, at first obtain slot timing according to descending primary synchronization channel (PSCH), obtain frame regularly according to descending auxiliary synchronization channel (SSCH) then, obtain descending main scrambling code information according to Common Pilot Channel (CPICH) at last.
The present invention is directed in the Cell searching first step slot synchronization and catch a kind of rapid and reliable acquisition equipment and the method for having provided.
The Primary Synchronisation Code word that sends length in the primary synchronization channel and be 256chip is used for slot synchronization catches, and this code word sends in the time at the initial 256chip of each time slot (length is 2560chip).By to the catching of Primary Synchronisation Code word phase place, travelling carriage can obtain the slot timing of base station.To slightly generally can realizing synchronously of this sequence phase by two kinds of methods: the one, correlator bank, promptly relevant with list entries on out of phase by a plurality of correlators, obtain the result from the correlated results judgement; The 2nd, matched filter is promptly done matched filtering with filter and list entries that an impulse response is known synchronizing sequence, obtains phase information from the matched filtering result judgement that provides continuously.Consider that main synchronizing sequence length is 256 among the W-CDMA, and the initial phase distribution is 2560chip, it is excessive if serial search is then delayed time to adopt correlator method, if parallel search realizes that then scale is excessive, then on search time-delay, realization scale greater advantage is arranged all with matched-filter approach.For the Primary Synchronisation Code matched filter of 1/Nchip precision (N is a positive integer), only need the storage depth of 256 * N, have only 13 and can reduce to according to the particularity arithmetic element of Primary Synchronisation Code, greatly reduce the scale and the complexity of realization.The present invention has adopted the deriving means of matched filter as thick synchronizing information.Because the decline that the wireless channel propagation brings in the radio communication and the influence of other interference noise, adjudicate to the Primary Synchronisation Code phase place is insecure the position that can not directly occur by maximum from the matched filtering output result to a time slot primary synchronization channel, need carry out the continuous detecting of a plurality of time slots; For different entry signal level, the matched filtering output of matched filter on correct phase is the energy difference as a result in addition.
Take all factors into consideration the influence of above factor, the present invention proposes a kind of adaptive threshold W-CDMA slot synchronization acquisition equipment, reach the purpose of accurately catching fast the Primary Synchronisation Code word.
(3) summary of the invention:
Method of the present invention and device technique scheme are as follows:
Can obtain continuous matching output result after importing the matched filter that baseband sampling (N times of spreading rate over-sampling) signal is the Primary Synchronisation Code word by impulse response, only be concerned about that in these results those surpass the value of given thresholding and occur the position accordingly.
Adaptive threshold W-CDMA time interval synchronizing method is as follows: (1) is passed through the matched filtering result's who surpasses certain threshold value among the matched filtering result of Primary Synchronisation Code word analysis is obtained slot synchronization information;
(2) determine the initial threshold value according to incoming level;
(3) if can't determine slot synchronization, then according to choosing of next threshold value determined in these results' analysis according to the current matched filtering result who surpasses thresholding who obtains.
Analyze Nrecord the Primary Synchronisation Code word matched filtering result who surpasses the setting thresholding who at every turn obtains, when these distribution of results (i.e. timeslot number of Kua Yueing at Nmin between the Nmax) in desirable time range, and in each time slot the phase place number of repetition of the matching result correspondence of amplitude maximum at Nmin between the Nmax, then think on this phase place, to obtain slot synchronization; Otherwise carry out the adjustment of threshold value according to the time distribution of matching result,, then increase threshold value, otherwise reduce threshold value if cross over timeslot number greater than Nmax.
As shown in Figure 1, apparatus of the present invention mainly comprise three parts: baseband signal processing module 1, stored record module 2 and control analysis module 3.Each several part basic function and correlation are as follows: baseband signal processing module 1 is used for N times of baseband sampling signal of input carried out matched filtering, provides the matched filtering result of continuous 1/N chip precision, and this result exports to stored record module 2.Note continuous Nrecord among the result of the thresholding that stored record module 2 provides according to control analysis module 3 with baseband signal processing module 1 output and surpass the result of thresholding and the relevant position of appearance thereof, analyze for control analysis module 3.Control analysis module 3 reads in the stored record module 2 all Nrecord result of record, whether covers the timeslot number of requirement and position that maximum occurs according to these data and whether repeats abundant number of times and decide the main synchronizing information of output still to adjust thresholding continuation processing, record, analysis next time.So baseband signal processing module directly is connected with the stored record module, the matched filtering result is exported to stored record module 2, stored record module 2 is connected with control analysis module 3, will surpass thresholding result and position and export to control analysis module 3, receives the thresholding of control analysis module 3 simultaneously.
Beneficial effect of the present invention: apparatus of the present invention and method are in order to guarantee the reliability of slot synchronization phase capturing, need on the correlated results of the same phase place of a plurality of time slots, be verified, the above-mentioned thresholding adjustment of process can guarantee the amplitude of main locking phase correspondence possible in suitably individual (Nmin is to the Nmax) time slot of fast recording, adds up by amplitude on the same phase thereafter and gets maximum and amplitude peak is gone out the reliability that a requirement of phase place number of times has guaranteed this amplitude peak phase place.By the above-mentioned main synchronization acquiring device and the workflow and the threshold regulating method of employing thereof, can rapid and reliable in given confinement time the Primary Synchronisation Code word be caught.
(4) description of drawings: Fig. 1 is an adaptive threshold W-CDMA slot synchronization acquisition equipment structured flowchart; Fig. 2 is apparatus of the present invention embodiment block diagram; Fig. 3 is an adaptive threshold W-CDMA slot synchronization acquisition equipment workflow diagram; Fig. 4 is the application of adaptive threshold W-CDMA slot synchronization acquisition equipment in the W-CDMA travelling carriage.
(5) embodiment:
Below in conjunction with description of drawings embodiment: as shown in Figure 2:
Baseband processing module 1 mainly comprises matched filter 101, this is a matched filter that impulse response is a backward Primary Synchronisation Code word, matched filtering corresponding to 1/N chip precision, N the sample value of its impulse response in a chip removed the Primary Synchronisation Code word on first response position, and all the other N-1 sample value is zero.Behind this matched filter of baseband signal process of N times of chip samples speed of input, the matched filtering output of N times of spreading rate will be obtained, correspond respectively to the correlated results of input signal and Primary Synchronisation Code word on 2560N the phase place of circulation, the time tag that correlated results occurs the phase information of its correspondence.
Stored record module 2 mainly comprises comparator 201 and memory cell 202.Record the threshold value that control analysis module 3 provides in the comparator 201, the matched filtering result's that this threshold value and baseband processing module 1 provide mould compares, provide indication for those results greater than threshold value, memory cell 202 is used to store the matching result that is higher than threshold value of those comparator 201 indications, write down its size and phase information simultaneously, store successively according to the priority that occurs, can store Nrecord bar record altogether, transfer to control analysis module 3 after being filled with and analyze.
Control analysis module 3 mainly is divided into thresholding controller 301, timeslot number counter 302, main sync bit decision device 303 and timer 304.Thresholding controller 301 is worked according to the given initial threshold control store logging modle 2 of system when initial, in the slot synchronization acquisition procedure, constantly the result according to timeslot number counter 302 and main sync bit decision device 303 adjusts threshold value to carry out stored record process next time; Nrecord of being used for memory cell 202 storage of timeslot number counter 302 writes down the analysis of carrying out on the time span, see whether recorded data is distributed in the desirable time range (being that timeslot number Nmin is to Nmax), analytical method is to see the relative size of two adjacent its phase informations of record, if the phase information of a back record is less, then thinks and crossed over a time slot; Main sync bit decision device 303 is used for handling memory cell 202 Nrecord records to obtain the Primary Synchronisation Code phase information, processing method is to the amplitude information of the different recording of same phase information is added up, choose wherein that phase place of amplitude maximum then, if the number of times that this phase place occurs meets the requirements (Nmin is to Nmax), then think main synchronously on this phase place, otherwise record is judged again; Timer 304 is used for the timing of whole synchronization acquistion process, and the process that whole success is caught is limited to given Tmax in the time.
Accompanying drawing 3 has provided the slot synchronization acquisition equipment workflow under the structured flowchart shown in the accompanying drawing 2.Slot synchronization need be provided with an initial threshold ThrdInit when catching beginning, this initial threshold is by system given (thresholding can be chosen according to travelling carriage incoming level size), after threshold setting (401) configured threshold, the continuous matched filtering result that matched filtering (402) is provided compares, select wherein amplitude greater than the record that carries out of thresholding, note amplitude and respective phase information simultaneously, write down N result (403) so altogether greater than thresholding; Result to record analyzes then, from the phase information of continuous two records whether the latter count the timeslot number Nslot (404) that the result covered of all records less than the former, if Nslot is not in Nmin arrives the scope of Nmax, the corresponding thresholding (405) of adjusting, again carry out threshold setting, record and analysis, if Nslot is in Nmin arrives the scope of Nmax, show that then current threshold value is suitable, the result who is write down can be used for further processing: with the amplitude of all Nrecord bars record same phase recording of information correspondences add up (406), that that choose the back amplitude maximum that wherein adds up is as the slot synchronization candidate, if this amplitude peak corresponding phase in Nrecord record occurrence number in Nmin arrives the Nmax scope (407), think that then this candidate's phase place is Primary Synchronisation Code word place phase place, successfully withdraw from main synchronization acquistion process (408) after exporting this phase place, if this amplitude peak corresponding phase occurrence number in Nrecord record is lower than Nmin, the phase place that this amplitude peak correspondence then is described is not reliable main locking phase, need carry out the thresholding adjustment again, be provided with, relatively write down and analyze, till finding reliable main locking phase.After initial threshold is set begins, can start timer work (501) simultaneously, in the said apparatus course of work, need regularly to inquire about timer, see and whether surpass the given maximum capture time Tmax (502) of system, then release main synchronization acquistion process as if overtime, otherwise proceed above-mentioned acquisition procedure with failure flags.
The method of thresholding adjustment here is: if Nrecord result of record covers timeslot number less than Nmin then increase ThrdStep on current thresholding basis, the covering timeslot number then reduces ThrdStep greater than Nmax on current thresholding basis; If Nrecord result covers timeslot number in Nmin arrives the Nmax scope, and the phase place occurrence number of the gained maximum correspondence that adds up is not then adjusted thresholding less than Nmin, continues next time relatively recording process.
Accompanying drawing 4 has provided apparatus of the present invention and method and has been applied to enforcement block diagram in the W-CDMA travelling carriage receiving system.As shown in the figure, the aerial signal that travelling carriage receives enters radio frequency front-end device 601, through becoming base band N times of chip speed sampled signal behind A/D converter 602 and the filter 603, import W-CDMA slot synchronization acquisition equipment 604 of the present invention, operational analysis obtains Primary Synchronisation Code word phase information after the given initial threshold, determine slot synchronization simultaneously, further finish cell search process by the assist in synchronization of back, main scrambler searcher 605.Can see that the slot synchronization acquisition equipment is crucial in a W-CDMA travelling carriage receiving system link, rapid and reliable acquisition performance is the important leverage of whole device superperformance.
Claims (5)
1. adaptive threshold W-CDMA time interval synchronizing method is characterized in that:
(1) obtains slot synchronization information by analysis to the matched filtering result that surpasses certain threshold value among the matched filtering result of Primary Synchronisation Code word;
(2) determine the initial threshold value according to incoming level;
(3) if can't determine slot synchronization, then according to choosing of next threshold value determined in these results' analysis according to the current matched filtering result who surpasses thresholding who obtains.
2. adaptive threshold W-CDMA time interval synchronizing method as claimed in claim 1, it is characterized in that: analyze Nrecord the Primary Synchronisation Code word matched filtering result who surpasses the setting thresholding who at every turn obtains, when these distribution of results (i.e. timeslot number of Kua Yueing at Nmin between the Nmax) in desirable time range, and in each time slot the phase place number of repetition of the matching result correspondence of amplitude maximum at Nmin between the Nmax, then think on this phase place, to obtain slot synchronization; Otherwise carry out the adjustment of threshold value according to the time distribution of matching result,, then increase threshold value, otherwise reduce threshold value if cross over timeslot number greater than Nmax.
3. adaptive threshold W-CDMA time interval synchronizing method as claimed in claim 1 is characterized in that, flow process is as follows synchronously: (1) is provided with initial threshold; (2) obtain matched filtering result above Nrecord Primary Synchronisation Code word of thresholding; (3) if the timeslot number of Nrecord result's leap and the repetition number of amplitude peak corresponding phase meet the requirements, then think to obtain withdrawing from after the slot synchronization information, otherwise enter step (4); (4) increase thresholding at most if Nrecord record leap timeslot number crossed, cross and reduce thresholding at least, return step (2), obtain the matching result that surpasses new threshold value; (5) if in given time, do not obtain satisfactory slot synchronization information, then overtime withdrawing from.
4. adaptive threshold W-CDMA slot synchronization device, it is characterized in that: comprise that baseband signal processing module (1), stored record module (2) and control analysis module (3) and baseband signal processing module directly are connected with the stored record module, the matched filtering result is exported to stored record module (2) stored record module (2) to be connected with control analysis module (3), to surpass thresholding result and position and export to control analysis module (3), receive the thresholding of control analysis module (3) simultaneously.
5. adaptive threshold W-CDMA slot synchronization device as claimed in claim 1 is characterized in that: comprise matched filter (101), comparator (201), memory cell (202), thresholding controller (301), timeslot number counter (302), main sync bit decision device (303) and timer (304); Described matched filter is finished the matched filtering to WCDMA Primary Synchronisation Code word, thresholding controller, timeslot number counter and main sync bit decision device use method as claimed in claim 2 to carry out the control of slot synchronization process, last output time solt synchronizing information or timeout error message.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409596C (en) * | 2003-10-28 | 2008-08-06 | 因芬尼昂技术股份公司 | Method and apparatus for regulating threshold electronic signal processing device |
| CN101854714A (en) * | 2010-05-13 | 2010-10-06 | 清华大学 | Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision |
| CN101399796B (en) * | 2007-09-28 | 2012-05-09 | 展讯通信（上海）有限公司 | Method and device for received frame processing for time division system |
| CN106817148A (en) * | 2016-12-19 | 2017-06-09 | 武汉慧联无限科技有限公司 | The method that single receiver receives different spreading factor sequences under low communication frequency |
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2001
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409596C (en) * | 2003-10-28 | 2008-08-06 | 因芬尼昂技术股份公司 | Method and apparatus for regulating threshold electronic signal processing device |
| CN101399796B (en) * | 2007-09-28 | 2012-05-09 | 展讯通信（上海）有限公司 | Method and device for received frame processing for time division system |
| CN101854714A (en) * | 2010-05-13 | 2010-10-06 | 清华大学 | Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision |
| CN101854714B (en) * | 2010-05-13 | 2012-09-05 | 清华大学 | Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision |
| CN106817148A (en) * | 2016-12-19 | 2017-06-09 | 武汉慧联无限科技有限公司 | The method that single receiver receives different spreading factor sequences under low communication frequency |
| CN106817148B (en) * | 2016-12-19 | 2019-02-05 | 武汉慧联无限科技有限公司 | Single receiver receives the method and device of spreading factor sequence under low communication frequency |
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