CN102202381A - Method for rapidly scanning frequency point of multiple cells - Google Patents
Method for rapidly scanning frequency point of multiple cells Download PDFInfo
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- CN102202381A CN102202381A CN2010101342328A CN201010134232A CN102202381A CN 102202381 A CN102202381 A CN 102202381A CN 2010101342328 A CN2010101342328 A CN 2010101342328A CN 201010134232 A CN201010134232 A CN 201010134232A CN 102202381 A CN102202381 A CN 102202381A
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Abstract
The invention belongs to the technical field of wireless communication, and particularly relates to a method for rapidly scanning a frequency point of multiple cells based on fast Fourier transform (FFT). The method comprises a rough scanning process and a fine scanning process; in the rough scanning process, a time domain is transformed through a time frequency, receiving data is transferred to a frequency domain through the FFT, the bandwidth and the central frequency point of a system are determined by judging the initial position of a frequency spectrum segment after frequency spectrum is shaped, and the error is reduced according to a certain rule; the bandwidth of the system can be determined and the central frequency point can be roughly determined by rough scanning; and in the fine scanning process, the power of each frequency point is measured by taking a fixed frequency interval as a step size around the determined spare central frequency point after rough scanning to obtain a group of spare frequency points and select a frequency point corresponding to the maximum power value as the central frequency point. By the method, the bandwidth and the central frequency points of all systems can be simultaneously determined under the condition of interference of the multiple cells so that a user can select access.
Description
Technical field
The invention belongs to wireless communication technology field, relate to a kind of many sub-districts fast frequency point scan method based on FFT.Be specifically related to a kind of in time division duplex-Long Term Evolution communication system (TDD-LTE) rapid frequency scanning method based on the many initial cell search of FFT.
Background technology
In cell mobile communication systems, portable terminal at first will carry out Cell searching, enters specific mobile communications network by this process, just can communicate then.Cell searching is portable terminal and sub-district Time and Frequency Synchronization, the process of finding sub-district ID.And in cell search process, portable terminal at first will obtain the center frequency point and the system bandwidth of sub-district in the enterprising line frequency spot scan of the whole communication band of correspondence.
Present cell initial frequency point scanning scheme proposes at GSM and CMDA standard mostly.Because their communication band is narrower and sub-district available system bandwidth is single, basic skills is to allow frequency to measure to all in these two kinds of standards, draws the tabulation of corresponding signal intensity and then determines access frequency point.
In the TDD-LTE system, the available communication frequency band is 2300MHz to 2400MHz, and total bandwidth is 100MHz.Each available center frequency point is spaced apart 100KHz.Usually the cell system bandwidth has three kinds of selection: 10MHz, 15MHz and 20MHz.When cellular downlink initial synchronisation scanning frequency is obtained center of housing estate frequency and bandwidth, if use the full range band one by one frequency check will travel through 1000 frequencies, and each frequency to have possibility of three kinds of bandwidth successively, be the ten minutes poor efficiency like this.Therefore need a kind of fast scanning method that can find the system centre frequency can judge system bandwidth simultaneously of research.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, proposed a kind of many sub-districts fast frequency point scan method, be specifically related to the initial synchronisation frequency scanning method under a kind of many area interference situation that is used for time division duplex-Long Term Evolution communication system (TDD-LTE) based on FFT.
Prior art is used in the TDD-LTE system to be the OFDMA modulation, and the frame structure of its data as shown in Figure 1.Each radio frames is made of two fields, and each field length is 5ms.Each field is made of 4 conventional subframes and a special subframe.A conventional subframe comprises two time slots, and each slot length is 0.5ms.Special subframe is by descending pilot frequency time slot (Downlink Pilot Time Slot; DwPTS), protection time slot (Guard Period; GP) and uplink pilot time slot (Uplink Pilot TimeSlot; UpPTS) three special time slots constitute; the length of DwPTS and UpPTS is configurable, but the total length of DwPTS, GP and UpPTS equals 1ms.Each time slot comprises N
Symb DLIndividual OFDM symbol.
The present invention is directed to that the whole communication band of TDD-LTE system is wide, the characteristics of sub-district available system adaptive-bandwidth, a step coarse scan and one that has designed based on FFT goes on foot the frequency scanning scheme of carefully sweeping, and can determine the available cell center frequency point and the system bandwidth thereof that are had on the whole communication band fast and accurately.The present invention can determine all system bandwidths and the center frequency point under many area interference situation simultaneously, selects to insert for the user.
Particularly, a kind of many sub-districts fast frequency point scan method of the present invention based on FFT, it is characterized in that, be transformed into frequency domain through FFT, determine the cell system bandwidth that inserts and the corresponding center frequency point that are had on the whole available band of LTE fast by receiving data.
The inventive method comprises coarse scan and carefully sweeps two processes; Coarse scan receives data by time-frequency conversion time domain earlier and is transformed into frequency domain through the FFT conversion, determines the bandwidth and the center frequency point of system behind the frequency spectrum shaping by the original position of judging wavelength coverage, and reduces error by certain rule; Can determine system bandwidth and rough definite center frequency point by coarse scan; Carefully sweep to be meant near the alternative center frequency point that coarse scan is determined, to be step-length, measure the power of a frequency, obtain one group of alternative frequency, select the maximum power value frequency points corresponding as center frequency point with fixed frequency interval (LTE channel grid).
Coarse scan of the present invention comprises following three processes: time-frequency conversion, shaping and judgement.
The conversion of described time-frequency is to be 20MHz by bandwidth respectively with the reception data, center frequency point is respectively the filter of window center, then filtered data are carried out the FFT conversion and obtain frequency spectrum in each window, on 100MHz, these wavelength coverages are spliced, obtain the spectrum distribution in the whole 100MHz.
Described shaping is by certain processing frequency spectrum to be converted into the rectangle that is fit to follow-up judgement, thereby determines the initial sum final position of each section frequency spectrum by observing rising edge and trailing edge easily.
Described judgement is to determine the bandwidth and the center frequency point of all alternative frequency bands by scanning the initial frequency of all frequency bands: measuring bandwidth is the poor of initial frequency, and center frequency point is the average of initial frequency; If the interval between adjacent two frequency spectrums is then merged into a frequency band to them, as shown in Figure 3 less than protection at interval.
Among the present invention, coarse scan is divided into 5 20MHZ windows with whole LTE band system band, it with the window center respectively the filter center frequency, with the length of window is that filter bandwidht carries out filtering to receiving data, filtering data is carried out obtaining behind the FFT spectrum distribution in each 20MHZ frequency band, on whole descending 100M frequency band, above-mentioned each wavelength coverage is spliced then, after shaping and a series of judgment condition, determine cell signal bandwidth and rough definite center frequency point.
Of the present invention carefully sweeping is in the frequency range of center frequency point ± 500KHZ that coarse scan is determined, with 100KHz is step-length, get 11 frequencies successively as filter center, and the corresponding system bandwidth of determining with coarse scan is a filter bandwidht, measure 11 performance numbers respectively, get performance number maximum frequency points corresponding as final center frequency point.
Among the present invention,, use during in order to the portable terminal down-going synchronous at last with coarse scan with carefully sweep all center frequency point and the bandwidth determined the back and set up tabulation according to the ordering of normalized power size.
Many sub-districts of the present invention fast frequency point scan method, its main flow process (Fig. 2) as follows:
1) is initial centre frequency with 2310MHZ, whole TDD-LTE frequency band is divided into the frequency range of 5 20MHZ;
2) respectively 5 data that frequency range received in last step are carried out FFT, the data that obtain that are about to sample are transformed into frequency domain through FFT, obtain its spectrum distribution on 5 frequency ranges;
3) check that whole signal band sees if there is signal spectrum, if not then jump back to 1 top step, otherwise the step below carrying out;
4) frequency spectrum with gained in 5 20MHZ frequency ranges splices, draw the independent signal frequency spectrum of the different districts on the whole TDD-LTE frequency band, think that promptly adjacent spaces is the frequency spectrum of same cell signal less than the frequency spectrum of sub-district protection bandwidth, thereby obtain separately independently cell signal frequency spectrum;
5) according to the last step obtain separately independently the initial sum of cell signal frequency spectrum determine the system bandwidth and the center frequency point of respective cell by frequency, promptly by the initial frequency of each section frequency spectrum with draw its corresponding system bandwidth and centre frequency by poor, the initial frequency of frequency and average by frequency;
6) center frequency point of accurate cell signal frequency spectrum.In the frequency range of each definite center of housing estate frequency left and right sides 500KHZ of last step, be that step-length is got 11 frequencies as center frequency point fc promptly, and the respective bandwidth of determining with the front is this performance number of 11 of bandwidth measurement with 100KHZ.Pairing frequency is as the practical center frequency of respective cell signal when getting the performance number maximum;
7) all center frequency point that will obtain above and bandwidth are set up tabulation according to the ordering of normalized power size, use during in order to the portable terminal down-going synchronous.
The inventive method has following advantage:
The present invention is directed to the complexity of time domain analysis under many area interference situation, time domain data is transformed into frequency domain through FFT, can be intuitively determine the system bandwidth and the center frequency point that are had on the whole available band by spectrum distribution; Simultaneously, the watt level ordering after by its normalization of all available bandwidths of searching is selected for the user, can avoid center frequency point and the required frequency of user searched for inconsistent, simulation result shows that this method can determine all system bandwidths and respective center frequency quickly and accurately.
Description of drawings
Fig. 1 is a TDD-LTE frame structure schematic diagram.
Fig. 2 finishes the operating process block diagram of initial frequency point scanning for the present invention.
Fig. 3 is cell signal fractional scanning frequency spectrum and frequency spectrum splicing schematic diagram,
Wherein, (a): frequency-division section scanning back gained spectrum diagram, dash area is a signal spectrum, and hypothesis has 2 cell signals here, and (b): carry out frequency spectrum splicing back gained spectrum diagram, dash area is a signal spectrum, and hypothesis has 2 cell signals here.
Fig. 4 is a simulation result,
Wherein, simulation parameter is set to: picked at random three group switching centre frequencies, 100 every group, simulate 3 area interference situations; Select bandwidth picked at random (satisfy different districts send not exist between the signal spectrum overlapping) in three kinds of system bandwidths (10MHZ, 15MHZ, 20MHZ) for use, signal to noise ratio is 10dB.
Embodiment
Embodiment 1 concrete frequency scanning
1. coarse scan: determine cell system bandwidth and rough center frequency point:
(1) time-frequency conversion
With the total frequency band 100MHz of LTE is that unit is divided into 5 windows with 20MHz, is center frequency point with the corresponding frequency of window center successively, is filter bandwidht with 20MHz, carries out filtering to receiving data.Get filtered n OFDM symbol and carry out FFT (in order to weaken the influence of data burst, n can correspondingly get greatly), time domain data is transformed into frequency domain, draw the spectrum distribution in each 20MHz frequency band.
(2) frequency spectrum in 5 20MHZ frequency bands is spliced
5 wavelength coverages are spliced in certain sequence, obtain the frequency spectrum in the whole 100MHz.Can intuitive judgment reception information concentrate according to spectrum distribution and to be distributed in which wavelength coverage, the system bandwidth that use promptly corresponding each sub-district.
(3) frequency spectrum shaping
Because the spectrum amplitude fluctuation is bigger, is unfavorable for subsequent treatment.Therefore should carry out shaping to spectrum information; The shaping algorithm that the present invention proposes is to ask it average to the spectrum amplitude of former frequency spectrum continuous N point; Setting threshold T; To put corresponding square wave amplitude be 1 if this mean value, then is provided with this greater than T; If mean value, then is set to-1 less than T;
(4) determine corresponding system bandwidth and center frequency point
Behind the frequency spectrum shaping, then can draw its corresponding system bandwidth and centre frequency by poor, the initial frequency sum of the initial frequency of each section frequency spectrum.(for example: the initial frequency of frequency spectrum is f1, and cut-off frequency is f2; Then its system bandwidth is f2-f1, and center frequency point fc is f1+ (f2-f1)/2).If the value of center frequency point f1+ (f2-f1)/2 is not the multiple of 100KHZ, can it be got into the multiple of 100KHZ by the method that rounds up.Usually get among three of 10M, 15M, the 20M with to measure bandwidth immediate as final bandwidth.Another important judgment condition is: if the interval between adjacent two frequency spectrums is then merged into a frequency band to them less than protection at interval;
2. carefully sweep: accurately determine the center of housing estate frequency:
Because may there be error in the center frequency point that coarse scan is determined, therefore need carry out on this basis more carefully sweeping accurately: promptly in the frequency range of each center frequency point left and right sides 500KHZ that coarse scan obtains, with 100KHz is step-length, get 11 frequencies successively as the filter center frequency, the system bandwidth of determining with coarse scan is a filter bandwidht, measure 11 performance numbers, get the maximum frequency points corresponding of performance number as final center frequency point.
3. set up the tabulation of available center frequency point and cell system bandwidth
The size of all center frequency point of obtaining and the corresponding system bandwidth power (power is divided by bandwidth) after by its normalization is arranged, carry out using when cell downlink is synchronous in order to portable terminal.
Claims (10)
1. the scan method of sub-district fast frequency point more than a kind, it is characterized in that, be transformed into frequency domain by receiving data through FFT, determine the cell system bandwidth that inserts and the corresponding center frequency point that are had on the whole available band of LTE fast, comprising coarse scan with carefully sweep two processes.
2. by the described method of claim 1, it is characterized in that described coarse scan process comprises time-frequency conversion, shaping and judgement.
3. by claim 1 or 2 described methods, it is characterized in that, described coarse scan receives data by time-frequency conversion time domain earlier and is transformed into frequency domain through the FFT conversion, determines the bandwidth and the center frequency point of system behind the frequency spectrum shaping by the original position of judging wavelength coverage, reduces error by rule.
4. by the described method of claim 1, it is characterized in that described carefully sweeping is near the alternative center frequency point that coarse scan is determined, be spaced apart step-length with fixed frequency, measure the power of a frequency, obtain alternative frequency, select the maximum power value frequency points corresponding as center frequency point.
5. by the described method of claim 2, it is characterized in that, the conversion of time-frequency in the described coarse scan process is to be 20MHz by bandwidth respectively with the reception data, center frequency point is respectively the filter of window center, then filtered data are carried out the FFT conversion and obtain frequency spectrum in each window, on 100MHz,, get the spectrum distribution in the whole 100MHz to the wavelength coverage splicing of gained.
6. by the described method of claim 2, it is characterized in that the shaping in the described coarse scan process is by handling frequency spectrum to be converted into the rectangle that is fit to follow-up judgement, thereby determine the initial sum final position of each section frequency spectrum by observing rising edge and trailing edge.
7. by the described method of claim 2, it is characterized in that the judgement in the described coarse scan process is to determine the bandwidth and the center frequency point of all alternative frequency bands by scanning the initial frequency of all frequency bands, wherein, measuring bandwidth is the poor of initial frequency, and center frequency point is the average of initial frequency.
8. by the described method of claim 7, it is characterized in that in the described judgement, the interval between adjacent two frequency spectrums is then merged into a frequency band to them less than protection at interval.
9. by the described method of claim 4, it is characterized in that, described carefully sweeping is in the frequency range of center frequency point ± 500KHZ that coarse scan is determined, with 100KHz is step-length, get 11 frequencies successively as filter center, and be filter bandwidht with the corresponding system bandwidth that coarse scan is determined, measure 11 performance numbers respectively, get performance number maximum frequency points corresponding as final center frequency point.
10. by the described method of claim 1, it is characterized in that described coarse scan and thin inswept journey last is center of housing estate frequency and the system bandwidth that will search, and is arranged in order for the portable terminal subsequent synchronisation by the watt level after its normalization and selects for use.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103096452A (en) * | 2011-10-28 | 2013-05-08 | 联芯科技有限公司 | Method and device of acquiring frequency correction burst (FB) |
| CN103167585A (en) * | 2011-12-13 | 2013-06-19 | 联芯科技有限公司 | Frequency point sequencing method and system in terminal cell search |
| CN103517380A (en) * | 2012-06-29 | 2014-01-15 | 联芯科技有限公司 | Searching method for cell central frequency points and mobile terminal |
| CN104469892A (en) * | 2013-09-25 | 2015-03-25 | 重庆重邮信科通信技术有限公司 | Method, system and mobile terminal for blind search of frequency points of frequency domain |
| CN104798403A (en) * | 2012-12-03 | 2015-07-22 | 展讯通信美国有限公司 | Method and apparatus for signal scanning for multimode receiver |
| CN105210419A (en) * | 2013-11-29 | 2015-12-30 | 联发科技股份有限公司 | Communications apparatus and method for carrier search |
| CN106488476A (en) * | 2015-08-31 | 2017-03-08 | 展讯通信（上海）有限公司 | The method of multimode terminal power scan and multimode terminal |
| CN107277893A (en) * | 2016-03-31 | 2017-10-20 | 英特尔Ip公司 | Method and apparatus for cell search |
| CN110290572A (en) * | 2019-07-19 | 2019-09-27 | 上海创远仪器技术股份有限公司 | The method and corresponding system of cell fast search are realized in LTE system |
| CN112134599A (en) * | 2020-09-17 | 2020-12-25 | 展讯通信（上海）有限公司 | Frequency sweeping method, equipment, device and storage medium |
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| CN103096452B (en) * | 2011-10-28 | 2015-06-10 | 联芯科技有限公司 | Method and device of acquiring frequency correction burst (FB) |
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| CN103167585A (en) * | 2011-12-13 | 2013-06-19 | 联芯科技有限公司 | Frequency point sequencing method and system in terminal cell search |
| CN103167585B (en) * | 2011-12-13 | 2015-11-25 | 联芯科技有限公司 | Frequency point sequencing method in terminal cell search and system |
| CN103517380B (en) * | 2012-06-29 | 2017-03-08 | 联芯科技有限公司 | A kind of searching method of center of housing estate frequency and mobile terminal |
| CN103517380A (en) * | 2012-06-29 | 2014-01-15 | 联芯科技有限公司 | Searching method for cell central frequency points and mobile terminal |
| CN104798403A (en) * | 2012-12-03 | 2015-07-22 | 展讯通信美国有限公司 | Method and apparatus for signal scanning for multimode receiver |
| CN104798403B (en) * | 2012-12-03 | 2018-11-20 | 展讯通信美国有限公司 | The method and apparatus of signal scanning for multimode rake receiver |
| CN104469892A (en) * | 2013-09-25 | 2015-03-25 | 重庆重邮信科通信技术有限公司 | Method, system and mobile terminal for blind search of frequency points of frequency domain |
| CN104469892B (en) * | 2013-09-25 | 2019-08-06 | 锐迪科（重庆）微电子科技有限公司 | The blind search method of frequency domain frequency point, system and mobile terminal |
| CN105210419A (en) * | 2013-11-29 | 2015-12-30 | 联发科技股份有限公司 | Communications apparatus and method for carrier search |
| CN106488476A (en) * | 2015-08-31 | 2017-03-08 | 展讯通信（上海）有限公司 | The method of multimode terminal power scan and multimode terminal |
| CN106488476B (en) * | 2015-08-31 | 2020-07-31 | 展讯通信（上海）有限公司 | Multimode terminal power scanning method and multimode terminal |
| CN107277893A (en) * | 2016-03-31 | 2017-10-20 | 英特尔Ip公司 | Method and apparatus for cell search |
| CN107277893B (en) * | 2016-03-31 | 2020-08-28 | 苹果公司 | Method and apparatus for cellular search |
| CN110290572A (en) * | 2019-07-19 | 2019-09-27 | 上海创远仪器技术股份有限公司 | The method and corresponding system of cell fast search are realized in LTE system |
| CN112134599A (en) * | 2020-09-17 | 2020-12-25 | 展讯通信（上海）有限公司 | Frequency sweeping method, equipment, device and storage medium |
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Application publication date: 20110928 |