CN104469892A - Method, system and mobile terminal for blind search of frequency points of frequency domain - Google Patents
Method, system and mobile terminal for blind search of frequency points of frequency domain Download PDFInfo
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Abstract
The embodiment of the invention relates to the technical field of communication, and discloses a method, system and mobile terminal for blind search of frequency points of a frequency domain. The method comprises the steps of calculating the power spectrum of the whole frequency section, filtering the power spectrum of the whole frequency section, quantizing and shaping the filtered power spectrum so that rectangular waves representing relative magnitudes of power values of all effective frequency points can be obtained, and conducting frequency point judgment to determine candidate frequency points according to the quantified and shaped rectangular waves. By means of the method, system and mobile terminal, the actual frequency points of sent signals can be quickly and accurately obtained, and the time for searching for cells is shortened.
Description
Technical field
The present invention relates to communication technical field, be specifically related to the blind search method of a kind of frequency domain frequency, system and mobile terminal.
Background technology
In a wireless communication system, terminal needs just can communicate normally by after cell search process and network settling time and Frequency Synchronization, terminal when do not have base station prior information and search prestore community failure, need to carry out the blind process of searching of frequency and obtain effective working frequency points.
Current mobile terminal is branched holds plurality of communication schemes, as WCDMA, CDMA2000, TD-SCDMA, LTE etc., each pattern has oneself distinctive operating frequency range, for the ease of the interoperability between different radio access technologies and mobile handoff, exist overlapping between the operating frequency range of different mode.
For 2G and 3G terminal, frequency is blind search the many employings of scheme time domain one by one the several frequency of frequency and interval carry out the mode that scans, for LTE terminal, because LTE frequency range is wider, frequency is more, scheme of searching that frequency is blind will make frequency according to the mode that time domain scans, and blind to search the time oversize.Publication number is that the Chinese patent of CN102316551A discloses a kind of method and the terminal that realize rapid frequency scanning, its method comprises: the time-domain signal received is converted to frequency-region signal by mobile terminal, is determined the frequency of access network by the power spectrum of the frequency-region signal scanning frequency band to be scanned.It is disclosed that the blind frequency domain schemes searched of a kind of single mode frequency, the program is according to the feature of LTE system, adopt the mode of frequency spectrum detection, time-domain signal in whole tested bandwidth is transformed to frequency-region signal, then frequency spectrum to received signal scans, determine possible center frequency point, improve the blind efficiency of searching of frequency, reduce the frequency blind time of searching.
To sum up, there is following problem and shortage in prior art:
1, multiple scanning during multimode
Multimode terminal is when carrying out that frequency is blind to be searched, and to the mode that the working frequency range of each pattern scans one by one, the frequency range of different mode overlap exists the problem of multiple scanning.
2, the poor performance when multipath fading and low signal-to-noise ratio
Due to the impact of noise and multipath fading, there is distortion in the frequency spectrum of Received signal strength, the time-domain signal of reception is carried out the selection that the frequency spectrum after Fourier transform directly carries out frequency, there is larger undetected and probability of false detection.
3, the detection perform when frequency band is adjacent is not good enough
When two frequency bands are adjacent, although there is certain interval between nearby frequency bands, but due to problems such as spectrum leakages, make the interval between frequency band not too obvious, the power threshold now preset becomes and is difficult to determine, when the power threshold preset is unreasonable, easily causes flase drop and undetected, thus affect detection perform.
Summary of the invention
Embodiment of the present invention technical problem to be solved is to provide the blind search method of a kind of frequency domain frequency, system and mobile terminal, for solve exist in prior art the multiple scanning of multimode system overlapped frequency bands, multipath fading, low signal-to-noise ratio and the not good enough problem of nearby frequency bands detection perform.
The embodiment of the present invention provides a kind of frequency domain frequency blind search method, and described method comprises:
S1, calculate the power spectrum of whole frequency range;
S2, filtering is carried out to the power spectrum of described whole frequency range;
S3, to quantize and shaping through described filtered power spectrum, to obtain the square wave of the performance number relative size characterizing each effective frequency;
S4, basis, to the described square wave quantized and obtain after shaping, carry out frequency judgement, to determine candidate's frequency.
Accordingly, the embodiment of the present invention also provides that a kind of frequency domain frequency is blind searches system, and described system comprises:
Computing unit, for calculating the power spectrum of whole frequency range;
Filter unit, for carrying out filtering to the power spectrum of described whole frequency range;
Quantize and shaping unit, for quantizing and shaping through described filtered power spectrum, to obtain the square wave of the performance number relative size characterizing each effective frequency;
Frequency decision unit, for according to the described square wave quantized and obtain after shaping, carries out frequency judgement, to determine candidate's frequency.
Accordingly, the embodiment of the present invention also provides a kind of mobile terminal, and described mobile terminal comprises that foregoing frequency domain frequency is blind searches system.
The blind search method of frequency domain frequency, system and the mobile terminal that there is provided in the embodiment of the present invention, by the mode of filtering, quantification and shaping, the true frequency sending signal can be obtained quickly and accurately, particularly when strong multipath fading and low signal-to-noise ratio and frequency band adjacent obtain the true frequency sending signal quickly and accurately, thus shorten the time of Cell searching.
Term " first ", " second ", " the 3rd " " 4th " etc. (if existence) in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein such as can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is flow process first schematic diagram of the blind search method of frequency domain frequency that the embodiment of the present invention one provides;
Fig. 2 is flow process second schematic diagram of the blind search method of frequency domain frequency that the embodiment of the present invention one provides;
Fig. 3 is flow process the 3rd schematic diagram of the blind search method of frequency domain frequency that the embodiment of the present invention one provides;
Fig. 4 is flow process the 4th schematic diagram of the blind search method of frequency domain frequency that the embodiment of the present invention one provides;
Fig. 5 is flow process the 5th schematic diagram of the blind search method of frequency domain frequency that the embodiment of the present invention one provides;
Fig. 6 is flow process the 6th schematic diagram of the blind search method of frequency domain frequency that the embodiment of the present invention one provides;
Fig. 7 is the blind structural representation searching system of frequency domain frequency that the embodiment of the present invention one provides;
Fig. 8 is the schematic shapes of square wave in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Providing the blind search method of a kind of frequency domain frequency, system and mobile terminal in the embodiment of the present invention, for obtaining the true frequency sending signal quickly and accurately, shortening the time of Cell searching.Below be described in detail respectively.
Embodiment one:
The invention provides the blind search method of a kind of frequency domain frequency, as shown in Figure 1, the method can comprise:
101, the power spectrum of whole frequency range is calculated;
102, filtering is carried out to the power spectrum of above-mentioned whole frequency range;
103, quantize and shaping through above-mentioned filtered power spectrum, to obtain the square wave of the performance number relative size characterizing each effective frequency;
104, according to the above-mentioned square wave quantized and obtain after shaping, frequency judgement is carried out, to determine candidate's frequency.
The blind search method of frequency domain frequency provided by the invention, by the mode of filtering, quantification and shaping, the true frequency sending signal can be obtained quickly and accurately, particularly when strong multipath fading and low signal-to-noise ratio and frequency band adjacent obtain the true frequency sending signal quickly and accurately, thus shorten the time of Cell searching.
Concrete, please refer to Fig. 2, above-mentioned steps 101 can specifically comprise:
Sub-band division information in the wide parameter of sub-band of 101A, reading pre-set or the form preserved in advance, is divided at least one sub-band by whole frequency range, and determines the center frequency point of each sub-band;
In certain embodiments of the present invention, a sub-bandwidth parameter can be preset so that whole frequency range is divided at least one sub-band, the wide parameter of this sub-band can preset according to the bin width of the actual receiving ability of mobile terminal and detection, if the maximum reception bandwidth when mobile terminal is 20M, wide for sub-band parameter can be set to 18M, namely be that whole frequency range is divided at least one sub-band, the width of each sub-band is 18M; After division completes, namely by calculating the center frequency point determining each sub-band;
Preferably, in certain embodiments of the present invention, also can in advance whole frequency band division be at least one sub-band and determine the center frequency point of each sub-band, then the center frequency point of sub-band division information and sub-band is saved as form in advance, so only need to read this form and just according to the sub-band division information in form, whole frequency range can be divided at least one sub-band, and determine center frequency point;
101B, above-mentioned each sub-band center frequency point according to predetermined reception bandwidth sum sample frequency receive base band data;
Above-mentioned predetermined reception bandwidth can be arranged according to actual conditions, such as, predetermined reception bandwidth is set to 20M;
Especially, if when last sub-band is less than 18M bandwidth, according to the center frequency point of residue frequency bandwidth, still receive bandwidth according to 20M to receive, can certainly according to the width of remaining bandwidth, select a suitable bandwidth to receive, do not do concrete restriction at this;
The setting that sample frequency also can be carried out in advance according to actual conditions, such as, can receive the base band data of 10ms according to the sample frequency of 30.72MHz in the present embodiment;
The length of above-mentioned reception base band data is not limited to 10ms, and those skilled in the art can carry out suitable setting according to actual conditions, do not do concrete restriction at this;
101C, Fourier transform is carried out to the above-mentioned base band data that the center frequency point of above-mentioned each sub-band receives, obtain the power spectrum of each sub-band;
Preferably, the maximum FFT that Fourier transform process can adopt mobile terminal to support counts as unit carries out FFT conversion several times to the time domain data received, and the result of each FFT is carried out the power spectrum that the irrelevant cumulative time-domain signal received as this sub-band is corresponding; Such as, it is 2048 that FFT can be adopted in the present embodiment to count, and its irrelevant totalization formula is:
If the number of 101D at least one sub-band above-mentioned is greater than 1, the power spectrum of above-mentioned each sub-band is stitched together and forms the power spectrum of whole frequency range;
If the number of sub-band is 1, so in step 101C namely what obtain be the power spectrum of whole frequency band; If the number of sub-band is greater than 1, then the power spectrum of each sub-band can be stitched together, obtains the power spectrum of whole frequency band, in splicing, the invalid frequency of the both sides, stitching portion of adjacent two sub-bands can be deleted;
In the present embodiment, if received according to 20M bandwidth, transmission bandwidth is be spaced apart 15kHz after 18M, FFT conversion between each frequency, considers DC component, can have 1201 effective frequencies in 2048.
The object of step 101 is the power spectrum obtaining whole frequency range to be searched, 101A, 101B, 101C and 101D give a kind of method obtaining power spectrum, but these steps are not 101A executes and could perform 101B, 101B executes and could perform 101C, 101C executes and could perform 101D, these steps also can be executed in parallel, and such as 101B just carries out 101C after can receiving a part of data.
Particularly, please refer to Fig. 3, above-mentioned steps 102 can specifically comprise:
102A, the performance number of each effective frequency and each q in left and right thereof effective frequency to be averaged, as the performance number of each effective frequency;
Wherein, q is predetermined positive integer, such as q can be 10(or other suitable numerical value), then for an effective frequency, the performance number of this effective frequency and left and right thereof each 10 effective frequencies (totally 21 effective frequencies) to be averaged, then using the performance number of this average power as this effective frequency.The effect of filtering can make the performance number of each effective frequency more level and smooth, makes the scheme of the present embodiment compared with prior art can have the ability of better antinoise and decline.
Above-mentioned steps 102A gives a kind of simple filtering method, and this step can also adopt other modes to realize certainly, such as FIR(FiniteImpulseResponse, finite impulse response), the system function of FIR filter is:
In above formula, such as, as N=5, h(z) can value: h(0 like this)=0.5, h(1)=0.2, h(3)=0.1, h(4)=0.1, h(5)=0.1;
Wherein, the coefficient in filter system function and N value can select different values as required, can certainly select IIR(Infinite Impulse Response, infinite impulse response) filter carries out filtering.
Particularly, please refer to Fig. 4, in certain embodiments of the present invention, above-mentioned steps 103 can specifically comprise:
The average noise power value of the above-mentioned power spectrum after 103A, calculating after filtering;
Following mode can be adopted to calculate the average noise power value of above-mentioned power spectrum: be averaged the performance number of the invalid frequency of the head and the tail of whole frequency range and obtain average noise power value; Or, the performance number of all invalid frequencies of whole frequency range is averaged and obtains average noise power value; Certain those skilled in the art can also select other account form according to actual conditions, do not do concrete restriction at this;
103B, by the performance number of each effective frequency after after filtering and the T of above-mentioned average noise power value
1, T
2t
ndoubly compare, performance number is more than or equal to the T of above-mentioned average noise power value
nthe power quantization value of effective frequency is doubly set to N, performance number is greater than the T of above-mentioned average noise power value
n-1doubly but be less than the T of above-mentioned average noise power value
nthe power quantization value of effective frequency is doubly set to N-1 ... performance number is greater than the T of above-mentioned average noise power value
1doubly but be less than the T of above-mentioned average noise power value
2the power quantization value of effective frequency is doubly set to 1, performance number is less than the T of above-mentioned average noise power value
1doubly effectively the power quantization value of frequency is set to 0, obtains the first square wave;
First square wave can be by the power quantization value of each effective frequency be the longitudinal axis, each effective frequency is the square wave that transverse axis is formed, as shown in Figure 8, in Fig. 8, for N=2;
Wherein, N is the positive integer pre-set, T
1, T
2t
nfor pre-set be greater than 1 constant, and T
n> T
n-1> ... > T
2> T
1;
Such as, as N=2, be namely by the performance number of each effective frequency after after filtering and the T of above-mentioned average noise power value
1, T
2doubly compare, performance number is more than or equal to the T of above-mentioned average noise power value
2the power quantization value of effective frequency is doubly set to 2, performance number is more than or equal to the T of above-mentioned average noise power value
1doubly but be less than the T of above-mentioned average noise power value
2the power quantization value of effective frequency is doubly set to 1, the power quantization value of all the other effective frequencies is set to 0, obtains the first square wave;
Work as N=2, T
2can be 1.08, T
1can be 1.05, certainly, those skilled in the art can according to the situation of reality by T
1, T
2be set to the numerical value that other is suitable, do not do concrete restriction at this;
Such as, as N=1, be namely by the performance number of each effective frequency after after filtering and the T of above-mentioned average noise power value
1doubly compare, performance number is more than or equal to the T of above-mentioned average noise power value
1the power quantization value of effective frequency is doubly set to 1, the power quantization value of all the other effective frequencies is set to 0, obtains the first square wave;
Work as N=1, T
1can be 1.08, certainly, those skilled in the art can according to the situation of reality by T
1be set to the numerical value that other is suitable, do not do concrete restriction at this;
103C, default n=1;
103D, the performance number connecting n-1 number in above-mentioned n-th square wave and be less than effective frequency of Th1 is set to n, obtains the (n+1)th square wave;
Such as when the performance number having continuous P effective frequency in the first square wave is 0, if P is less than Th1, then the performance number of this continuous P effective frequency is all revised as 1, the advantage done like this is to prevent interval from judging by accident;
Wherein, Th1 is the positive integer pre-set, and such as Th1 can be set to 13, certain those skilled in the art, according to actual conditions, Th1 can also be set to other suitable numerical value, not do concrete restriction at this;
103E, judge whether n is more than or equal to N, if so, perform step 104, otherwise perform step 103F;
103F, n=n+1, perform step 103D.
The first square wave that the mode adopting N+1 level to quantize in step 103A-103B obtains after the present invention is quantized better can react the position of strong and weak signals power spectrum, the frequency of strong signal can be come before the list of candidate's frequency when step 104 carries out frequency judgement like this, the shaping of step 103C-103F can eliminate the impact of decline further in addition.
Above-mentioned steps 103A and 103B gives and utilizes average noise power value to carry out the mode quantized, and the maximum power value of power spectrum can certainly be utilized to quantize, and such as, in certain embodiments of the present invention, step 103 can specifically comprise:
The maximum power value of the power spectrum after 103A ', calculating after filtering;
103B ', by the performance number of each effective frequency after after filtering and the T ' of above-mentioned maximum power value
1, T '
2t '
ndoubly compare, performance number is more than or equal to the T ' of above-mentioned maximum power value
nthe performance number of effective frequency doubly quantizes to be set to N, performance number is more than or equal to the T ' of above-mentioned maximum power value
n-1doubly but be less than the T ' of above-mentioned maximum power value
nthe power quantization value of effective frequency is doubly set to N-1 ... performance number is more than or equal to the T ' of above-mentioned maximum power value
1doubly but be less than the T ' of above-mentioned maximum power value
2the power quantization value of effective frequency is doubly set to 1, performance number is less than the T ' of above-mentioned maximum power value
1doubly effectively the power quantization value of frequency is set to 0, obtains the first square wave;
Wherein, N is the positive integer pre-set, T '
1, T '
2t '
nfor pre-set be greater than 1 constant, and T '
n> T '
n-1> ... > T '
2> T '
1;
Such as work as N=2, T '
2can be 0.98, T '
1can be 0.95, certainly, those skilled in the art can according to the situation of reality by T '
1, T '
2be set to the numerical value that other is suitable, do not do concrete restriction at this;
103C’、n=1；
103D ', the power quantization value connecting n-1 number in above-mentioned n-th square wave and be less than effective frequency of Th1 is set to n, obtains the (n+1)th square wave;
Such as when the power quantization value having continuous P effective frequency in the first square wave is 0, if P is less than Th1, then the power quantization value of this continuous P effective frequency is all revised as 1, the advantage done like this is to prevent interval from judging by accident;
Wherein, Th1 is the positive integer pre-set, and such as Th1 can be set to 13, certain those skilled in the art, according to actual conditions, Th1 can also be set to other suitable numerical value, not do concrete restriction at this;
103E ', judge whether n is more than or equal to N, if so, perform step 104, otherwise perform step 103F ';
103F ', n=n+1, perform step 103D '.
Particularly, please refer to Fig. 5, above-mentioned steps 104 can specifically comprise:
104A, default x=N;
104B, determine that power quantization value is frequency bandwidth and the center frequency point thereof of each effective band of x, using power quantization value be the center frequency point of each effective band of x and each m in left and right effectively frequency as xth group candidate frequency;
In the present embodiment, according to rising edge (initial frequency) and the trailing edge (end frequency) of the square wave obtained in step 103, possible center frequency point can be determined, such as: the initial frequency of certain section of effective band is f1, end frequency is f2, then center frequency point is (f2-f1)/2+f1; Preferably, if the center frequency point calculated is not the integral multiple of 100kHz, can rounds up to result and result be become the integral multiple of 100kHz;
104C, judge whether x is greater than 1, if so, perform step 104D, otherwise, process ends;
104D, be that the power quantization value of all effective frequency of x is set to x-1 by power quantization value;
104E, x=x-1, perform step 104B;
In the present embodiment, can determine the priority of candidate's frequency according to the sequencing calculated, then the priority of xth group candidate frequency is higher than xth-1 group candidate frequency;
Wherein m is predetermined integer, such as m=5, and certain those skilled in the art can carry out suitable setting according to actual conditions, do not do concrete restriction at this.
No matter how many quantification gradations in the present embodiment, adopt quantize according to the mode of maximum power power spectrum time, can comprise after step 104:
Judge whether that all candidate's frequencies all cannot be normally resident, if so, all frequency bands detected during deduction last execution step 104 from filtered power spectrum as new filtered power spectrum, and turn back to step 103; Otherwise perform next step or process ends.
After returning step 103, continue to perform above-mentioned steps 103-104, determine possible effective frequency.This step can reduce the interference of invalid strong signal frequency point to effective weak signal frequency, ensures when there is strong signal disturbing, can detect effective weak signal frequency.This step is optional.
Above-mentioned steps 103,104 give multi-stage quantization, shaping and frequency judgement specific implementation step, below with adopt average noise power power spectrum 3 grades of quantifications be described, i.e. N=2, now step 103-104 can comprise:
Calculate the average noise power value of the above-mentioned power spectrum after filtering;
By the performance number of each effective frequency after after filtering and the T of above-mentioned average noise power value
1, T
2doubly compare, performance number is more than or equal to the T of above-mentioned average noise power value
2the power quantization value of effective frequency is doubly set to 2, performance number is more than or equal to the T of above-mentioned average noise power value
1doubly but be less than the T of above-mentioned average noise power value
2the power quantization value of effective frequency is doubly set to 1, the power quantization value of all the other effective frequencies is set to 0, obtains the first square wave;
The power quantization value connecting 0 number in above-mentioned first square wave and be less than effective frequency of Th1 is set to 1, obtains the second square wave;
The power quantization value connecting 1 number in above-mentioned second square wave and be less than effective frequency of Th1 is set to 2, obtains the 3rd square wave;
Determine that power quantization value is frequency bandwidth and the center frequency point thereof of each effective band of 2, using power quantization value be the center frequency point of each effective band of 2 and each m in left and right effectively frequency as second group of candidate's frequency;
Be that the power quantization value of all effective frequency of 2 is set to 1 by performance number;
Determine that performance number is frequency bandwidth and the center frequency point thereof of each effective band of 1, using power quantization value be the center frequency point of each effective band of 1 and each m in left and right effectively frequency as first group of candidate's frequency; The priority of second group of candidate's frequency is higher than first group of candidate's frequency.
Preferably, please refer to Fig. 6, after step 104, the method also can comprise:
The bandwidth of the various patterns that 105, may be existed at each candidate's frequency place, compared with the frequency bandwidth of its place effective band, selecting and recording with the immediate pattern of frequency bandwidth of its place effective band is the pattern of each candidate's frequency.
In the present embodiment, for multimode terminal, step 105 can determine the pattern of each candidate's frequency, for single-mode terminal, can perform step 105.
In the present embodiment, for multimode terminal, the crossband of different mode obtains possible sending mode by bandwidth information, crossband multiple scanning problem when existing method can be avoided to scan respectively according to the frequency band of different mode, thus accelerate the acquisition speed of true frequency further, further shorten the time of Cell searching, between search rate and search accuracy, reach in a basic balance.User can be promoted at Consumer's Experience when prestoring Cell searching failure and lose the network coverage of starting shooting.
Preferably, please refer to Fig. 6, in the present embodiment, after step 104, the method also can comprise:
106, measure the center frequency point of each effective band and the performance number of each m in left and right effective frequency thereof, by frequency maximum for performance number alternatively frequency, all the other are deleted.
In the present embodiment, step 106 can be screened candidate's frequency, reduces the number of candidate's frequency, can promote the speed of accessing terminal to network.
It should be noted that above-mentioned steps 105 and 106 there is no specific precedence relationship in execution, those skilled in the art can select according to actual conditions.
Embodiment two:
The invention provides that a kind of frequency domain frequency is blind searches system, as shown in Figure 7, this system can comprise:
Computing unit 100, for calculating the power spectrum of whole frequency range;
Filter unit 200, for carrying out filtering to the power spectrum of above-mentioned whole frequency range;
Quantize and shaping unit 300, for quantizing and shaping through the filtered power spectrum of above-mentioned filter unit 200, to obtain the square wave of the performance number relative size characterizing each effective frequency;
Frequency decision unit 400, for according to the above-mentioned square wave quantized and obtain after shaping, carries out frequency judgement, to determine candidate's frequency.
Frequency domain frequency provided by the invention is blind searches system, by the mode of filtering, quantification and shaping, can be quickly and accurately, particularly when strong multipath fading and low signal-to-noise ratio and frequency band adjacent obtain the true frequency sending signal quickly and accurately, thus shorten the time of Cell searching.
Particularly, computing unit 100 can comprise sub-band division unit, base band data receives subelement, Fourier transform subelement and power spectrum splicing subelement, wherein,
Above-mentioned sub-band division unit, the sub-band division information in the wide parameter of sub-band that can be used for reading pre-set or the form preserved in advance, is divided at least one sub-band by above-mentioned whole frequency range, and determines the center frequency point of each sub-band;
In certain embodiments of the present invention, a sub-bandwidth parameter can be preset so that whole frequency range is divided at least one sub-band, the wide parameter of this sub-band can preset according to the bin width of the actual receiving ability of mobile terminal and detection, if the maximum reception bandwidth when mobile terminal is 20M, wide for sub-band parameter can be set to 18M, namely whole frequency range can be divided at least one sub-band by above-mentioned sub-band division unit, and the width of each sub-band is 18M; After division completes, namely by calculating the center frequency point determining each sub-band;
Preferably, in certain embodiments of the present invention, also can in advance whole frequency band division be at least one sub-band and determine the Centroid of each sub-band, then the center frequency point of sub-band division information and sub-band is saved as form in advance, above-mentioned like this sub-band division unit only needs to read this form just can be divided at least one sub-band according to the sub-band division information in form by whole frequency range, and determines the information of each center frequency point;
Above-mentioned base band data receives subelement, receives base band data for the center frequency point at above-mentioned each sub-band according to predetermined reception bandwidth sum sample frequency;
Above-mentioned predetermined reception bandwidth can be arranged according to actual conditions, such as, predetermined reception bandwidth is set to 20M;
Especially, if when last sub-band is less than 18M bandwidth, according to the center frequency point of residue frequency bandwidth, still receive bandwidth according to 20M to receive, can certainly according to the width of remaining bandwidth, select a suitable bandwidth to receive, do not do concrete restriction at this;
The setting that sample frequency also can be carried out in advance according to actual conditions, such as, can receive the base band data of 10ms according to the sample frequency of 30.72MHz in the present embodiment;
The length of above-mentioned reception base band data is not limited to 10ms, and those skilled in the art can carry out suitable setting according to actual conditions, do not do concrete restriction at this;
Above-mentioned Fourier transform subelement, carries out Fourier transform for the above-mentioned base band data received the center frequency point of above-mentioned each sub-band, obtains the power spectrum of each sub-band;
Preferably, the maximum FFT that Fourier transform process can adopt mobile terminal to support counts as unit carries out FFT conversion several times to the time domain data received, and the result of each FFT is carried out the power spectrum that the irrelevant cumulative time-domain signal received as this sub-band is corresponding; Such as, it is 2048 that FFT can be adopted in the present embodiment to count, and its irrelevant totalization formula is:
Above-mentioned power spectrum splicing subelement, the number that can be used for when at least one sub-band above-mentioned is greater than 1, and being stitched together by the power spectrum of above-mentioned each sub-band forms the power spectrum of whole frequency range;
If the number of sub-band is 1, the power spectrum of namely what the process of so above-mentioned Fourier transform subelement obtained be whole frequency band; If the number of sub-band is greater than 1, then the power spectrum of each sub-band can be stitched together, obtains the power spectrum of whole frequency band, in splicing, the invalid frequency of the both sides, stitching portion of adjacent two sub-bands can be deleted;
In the present embodiment, if received according to 20M bandwidth, transmission bandwidth is be spaced apart 15kHz after 18M, FFT conversion between each frequency, considers DC component, can have 1201 effective frequencies in 2048.
Particularly, filter unit 200 can specifically for being averaged, as the performance number of each effective frequency the performance number of each effective frequency and each q in left and right effective frequency thereof.
Wherein, q is predetermined positive integer, such as q can be 10(or other suitable numerical value), then for an effective frequency, the performance number of this effective frequency and left and right thereof each 10 effective frequencies (totally 21 effective frequencies) to be averaged, then using the performance number of this average power as this effective frequency.The effect of filtering can make the performance number of each effective frequency more level and smooth, makes the scheme of the present embodiment compared with prior art can have the ability of better antinoise and decline.
Certain filter unit 200 can also adopt other mode to carry out filtering, such as FIR filtering or IIR filtering, and concrete content can the description of reference example one, does not repeat them here.
Particularly, quantification and shaping unit 300 specifically can comprise average noise power value computation subunit, quantification subelement, first presets subelement, shaping subelement, the first judgment sub-unit and the first circulation subelement, wherein,
Above-mentioned average noise power computation subunit, can be used for calculating the average noise power value of the above-mentioned power spectrum after filtering;
Following mode can be adopted to calculate the average noise power value of above-mentioned power spectrum: be averaged the performance number of the invalid frequency of the head and the tail of whole frequency range and obtain average noise power; Or, the performance number of all invalid frequencies of whole frequency range is averaged and obtains average noise power; Certain those skilled in the art can also select other account form according to actual conditions, do not do concrete restriction at this;
Above-mentioned quantification subelement, can be used for the performance number of each effective frequency after after filtering and the T of above-mentioned average noise power value
1, T
2t
ndoubly compare, performance number is more than or equal to the T of above-mentioned average noise power value
nthe power quantization value of effective frequency is doubly set to N, performance number is more than or equal to the T of above-mentioned average noise power value
n-1doubly but be less than the T of above-mentioned average noise power value
nthe power quantization value of effective frequency is doubly set to N-1 ... performance number is more than or equal to the T of above-mentioned average noise power value
1doubly but be less than the T of above-mentioned average noise power value
2the power quantization value of effective frequency is doubly set to 1, performance number is less than the T of above-mentioned average noise power value
1doubly effectively the power quantization value of frequency is set to 0, obtains the first square wave;
N is the positive integer pre-set, T
1, T
2t
nfor pre-set be greater than 1 constant, and T
n> T
n-1> ... > T
2> T
1;
Above-mentioned first presets subelement, for default n=1;
Above-mentioned shaping subelement, can be used for connecting in the n-th square wave the power quantization value that n-1 number is less than effective frequency of Th1 and is set to n, obtain the (n+1)th square wave;
Such as when the power quantization value having continuous P effective frequency in the first square wave is 0, if P is less than Th1, then the power quantization value of this continuous P effective frequency is all revised as 1, the advantage done like this is to prevent interval from judging by accident;
Wherein, Th1 is the positive integer pre-set, and such as Th1 can be set to 13, certain those skilled in the art, according to actual conditions, Th1 can also be set to other suitable numerical value, not do concrete restriction at this;
Above-mentioned first judgment sub-unit, can be used for judging whether n is more than or equal to N;
Above-mentioned circulation subelement, for when the judged result of above-mentioned first judgment sub-unit is no, makes n=n+1, and the new value of n is sent to above-mentioned shaping subelement, continues to perform corresponding operating to make above-mentioned shaping subelement.
The first square wave obtained after the mode that quantification and shaping unit 300 adopt N+1 level to quantize makes the present invention quantize better can react the position of strong and weak signals power spectrum, the frequency of strong signal can come before the list of candidate's frequency when carrying out frequency judgement by such frequency decision unit 400, and the shaping of quantification and shaping unit 300 can eliminate the impact of decline further in addition.
Above-mentionedly the maximum power value of power spectrum can certainly be utilized to quantize to quantize and the description of shaping unit 300 gives the mode utilizing average noise power value to quantize, particular content can the description of reference example one, does not repeat them here.
Particularly, frequency decision unit 400 specifically can comprise second and preset subelement, candidate's frequency determination subelement, the second judgment sub-unit, amendment subelement and the second circulation subelement, wherein,
Above-mentioned second presets subelement, for default x=N;
Above-mentioned candidate's frequency determination subelement, can be used for determining that power quantization value is frequency bandwidth and the center frequency point thereof of each effective band of x, using performance number be the center frequency point of each effective band of x and each m in left and right effectively frequency as xth group candidate frequency;
In the present embodiment, rising edge (initial frequency) and the trailing edge (end frequency) of the square wave obtained is processed according to quantification and shaping unit 300, possible center frequency point can be determined, such as: the initial frequency of certain section of effective band is f1, end frequency is f2, then center frequency point is (f2-f1)/2+f1; Especially, if the center frequency point calculated is not the integral multiple of 100kHz, can rounds up to result and result be become the integral multiple of 100kHz;
Above-mentioned second judgment sub-unit, can be used for judging whether x is greater than 1;
Above-mentioned amendment subelement, the power quantization value that can be used for all effective frequency by power quantization value being x is set to x-1;
Above-mentioned second circulation subelement, for making x=x-1, and exports above-mentioned candidate's frequency determination subelement to by new x value, continue to perform corresponding operating to make above-mentioned candidate's frequency determination subelement;
In the present embodiment, can determine the priority of candidate's frequency according to the sequencing calculated, then the priority of xth group candidate frequency is higher than xth-1 group candidate frequency;
Wherein m is predetermined integer, such as m=5, and certain those skilled in the art can carry out suitable setting according to actual conditions, do not do concrete restriction at this.
Preferably, in the present embodiment, this system also can comprise:
Mode determination, can be used for the bandwidth of the various patterns that may be existed at each candidate's frequency place, and compared with the frequency bandwidth of its place effective band, selecting and recording with the immediate pattern of frequency bandwidth of its place effective band is the pattern of each candidate's frequency.
In the present embodiment, for multimode terminal, mode determination can be used for the pattern determining each candidate's frequency, for single-mode terminal, can not have mode determination.
In the present embodiment, for multimode terminal, the crossband of different mode obtains possible sending mode by bandwidth information, crossband multiple scanning problem when existing method can be avoided to scan respectively according to the frequency band of different mode, thus accelerate the acquisition speed of true frequency further, further shorten the time of Cell searching, between search rate and search accuracy, reach in a basic balance.User can be promoted at Consumer's Experience when prestoring Cell searching failure and lose the network coverage of starting shooting.
Preferably, in the present embodiment, this system also can comprise:
Candidate's frequency screening unit, the performance number of each m of center frequency point and left and right thereof for measuring each effective band effective frequency, by frequency maximum for performance number alternatively frequency, all the other are deleted.
In the present embodiment, candidate's frequency that candidate's frequency screening unit can be determined frequency decision unit 400 screens, and reduces the number of candidate's frequency, can promote the speed of accessing terminal to network.
Embodiment three:
The present invention also provides a kind of mobile terminal, this mobile terminal can comprise as all or part of in embodiment two as described in frequency domain frequency blindly search system, particular content can the description of reference example two, does not repeat them here.
Each embodiment is all based on same inventive concept above, and the description of each embodiment emphasizes particularly on different fields, and describes not detailed part in separate embodiment, can with reference to the description in other embodiments.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer-readable recording medium, storage medium can comprise: flash disk, read-only memory (Read-OnlyMemory, ROM), random access device (Random Access Memory, RAM), disk or CD etc.
Above the blind search method of frequency domain frequency, system and mobile terminal that the embodiment of the present invention provides are described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1. the blind search method of frequency domain frequency, is characterized in that, described method comprises:
S1, calculate the power spectrum of whole frequency range;
S2, filtering is carried out to the power spectrum of described whole frequency range;
S3, to quantize and shaping through described filtered power spectrum, to obtain the square wave of the performance number relative size characterizing each effective frequency;
S4, basis, to the described square wave quantized and obtain after shaping, carry out frequency judgement, to determine candidate's frequency.
2. method according to claim 1, is characterized in that, described step S1 specifically comprises:
Sub-band division information in the wide parameter of sub-band of S11, reading pre-set or the form preserved in advance, is divided at least one sub-band by described whole frequency range, determines the center frequency point of each sub-band;
S12, described each sub-band center frequency point according to predetermined reception bandwidth sum sample frequency receive base band data;
S13, Fourier transform is carried out to the described base band data that the center frequency point of described each sub-band receives, obtain the power spectrum of each sub-band;
If the number of S14 at least one sub-band described is greater than 1, the power spectrum of described each sub-band is stitched together and forms the power spectrum of whole frequency range.
3. method according to claim 1, is characterized in that, described step S2 specifically comprises:
The performance number of each effective frequency and each q in left and right effective frequency thereof is averaged, as the performance number of each effective frequency; Q is predetermined positive integer.
4. method according to claim 1, is characterized in that, described step S3 specifically comprises:
The average noise power value of the described power spectrum after S31, calculating after filtering;
S32, by the performance number of each effective frequency after after filtering and the T of described average noise power value
1, T
2t
ndoubly compare, performance number is more than or equal to the T of described average noise power value
nthe power quantization value of effective frequency is doubly set to N, performance number is more than or equal to the T of described average noise power value
n-1doubly but be less than the T of described average noise power value
nthe power quantization value of effective frequency is doubly set to N-1 ... performance number is greater than the T of above-mentioned average noise power value
1doubly but be less than the T of above-mentioned average noise power value
2the power quantization value of effective frequency is doubly set to 1, performance number is less than the T of above-mentioned average noise power value
1doubly effectively the power quantization value of frequency is set to 0, obtains the first square wave; Described T
1, T
2... T
nfor pre-set be greater than 1 constant, and T
n> T
n-1> ... > T
2> T
1;
S33, default n=1;
S34, the power quantization value connecting n-1 number in described n-th square wave and be less than effective frequency of Th1 is set to n, obtains the (n+1)th square wave; Th1 is the positive integer pre-set;
S35, judge whether n is more than or equal to N, if perform step S4, otherwise perform step S36;
S36, make n=n+1, and perform described step S34.
5. method according to claim 1, is characterized in that, described step S3 specifically comprises:
The maximum power value of the described power spectrum after S31 ', calculating after filtering;
S32 ', by the performance number of each effective frequency after after filtering and the T ' of above-mentioned maximum power value
1, T '
2t '
ndoubly compare, performance number is more than or equal to the T ' of above-mentioned maximum power value
nthe performance number of effective frequency doubly quantizes to be set to N, performance number is more than or equal to the T ' of above-mentioned maximum power value
n-1doubly but be less than the T ' of above-mentioned maximum power value
nthe power quantization value of effective frequency is doubly set to N-1 ... performance number is more than or equal to the T ' of above-mentioned maximum power value
1doubly but be less than the T ' of above-mentioned maximum power value
2the power quantization value of effective frequency is doubly set to 1, performance number is less than the T ' of above-mentioned maximum power value
1doubly effectively the power quantization value of frequency is set to 0, obtains the first square wave; Described T '
1, T '
2t '
nfor pre-set be greater than 1 constant, and T '
n> T '
n-1> ... > T '
2> T '
1;
S33 ', default n=1;
S34 ', the power quantization value connecting n-1 number in described n-th square wave and be less than effective frequency of Th1 is set to n, obtains the (n+1)th square wave; Th1 is the positive integer pre-set;
S35 ', judge whether n is more than or equal to N, if perform step S4, otherwise perform step S36 ';
S36 ', make n=n+1, and perform described step S34 '.
6. the method according to claim 4 or 5, is characterized in that, described step S4 specifically comprises:
S41, default x=N;
S42, determine that power quantization value is frequency bandwidth and the center frequency point thereof of each effective band of x, using power quantization value be the center frequency point of each effective band of x and each m in left and right effectively frequency as xth group candidate frequency; M is predetermined integer;
S43, judge whether x is greater than 1, if so, perform step S44, otherwise process ends;
S44, be that the power quantization value of all effective frequency of x is set to x-1 by power quantization value;
S45, make x=x-1, and perform step S42.
7. method according to claim 1, is characterized in that, described method also comprises:
S5, the bandwidth of various patterns that may be existed at each candidate's frequency place, compared with the frequency bandwidth of its place effective band, selecting and recording with the immediate pattern of frequency bandwidth of its place effective band is the pattern of each candidate's frequency.
8. method according to claim 1, is characterized in that, described method also comprises:
The performance number of S6, the center frequency point measuring each effective band and each m in left and right thereof effective frequency, by frequency maximum for performance number alternatively frequency, all the other are deleted.
9. frequency domain frequency is blind searches a system, and it is characterized in that, described system comprises:
Computing unit, for calculating the power spectrum of whole frequency range;
Filter unit, for carrying out filtering to the power spectrum of described whole frequency range;
Quantize and shaping unit, for quantizing and shaping through described filtered power spectrum, to obtain the square wave of the performance number relative size characterizing each effective frequency;
Frequency decision unit, for according to the described square wave quantized and obtain after shaping, carries out frequency judgement, to determine candidate's frequency.
10. system according to claim 9, is characterized in that, described system also comprises:
Mode determination, for the bandwidth of various patterns that may be existed at each candidate's frequency place, compared with the frequency bandwidth of its place effective band, selecting and recording with the immediate pattern of frequency bandwidth of its place effective band is the pattern of each candidate's frequency.
11. 1 kinds of mobile terminals, is characterized in that, described mobile terminal comprises that frequency domain frequency as described in claim 9 or 10 is blind searches system.
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