CN102665256A - Frequency sweeping method, frequency sweeping device, web searching method and web searching terminal for wireless communication system - Google Patents
Frequency sweeping method, frequency sweeping device, web searching method and web searching terminal for wireless communication system Download PDFInfo
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Abstract
An embodiment of the invention provides a frequency sweeping method for a wireless communication system. The frequency sweeping method for the wireless communication system includes: acquiring candidate frequency points from a frequency sweeping pattern; converting time-domain signals of the candidate frequency points into frequency-domain signals, wherein the interval among the candidate frequency points converted into the frequency domain is larger than that of the candidate frequency points in the time domain; performing energy calculation for the signals converted into the frequency domain so as to obtain frequency-domain energy windows; and selecting the frequency points with the frequency-domain energy windows larger than a preset threshold value and outputting the frequency points as frequency sweeping results. The embodiment of the invention further provides a frequency sweeping device for the wireless communication system, and further provides a web searching method and a web searching terminal for the wireless communication system based on the frequency sweeping method and the frequency sweeping device. By the aid of the methods and the devices in the embodiment, frequency sweeping times for the candidate frequency points and frequency point switching times are decreased, frequency sweeping time is shortened, and web searching efficiency of the wireless communication system is improved.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of wireless communication system frequency sweep method and related device, method for searching network and corresponding terminal.
Background technology
Along with developing rapidly of information technology, the range of application of wireless communication system more and more widely.Various application based on wireless communication system; Web search all will be carried out in the terminal before the resource of utilizing wireless communication system to provide; Realize that web search need carry out the frequency sweep operation, the time of accomplishing the frequency sweep process cost of identical swept frequency range depend primarily on frequency sweep frequency quantity what, the frequency number is few more; The frequency sweep process efficiency is high more, and the time of whole network search procedure cost is short more.Referring to accompanying drawing 1; With the portable terminal access of radio network is example; After travelling carriage detects wireless network signal, start network search procedure: in time domain, travel through each the candidate's frequency in the swept frequency range earlier, select the frequency series of the some that meets the demands according to the frequency energy measurements; Then the frequency series of selecting is verified to obtain available frequency or to confirm no available frequency one by one, will be obtained available frequency as the communications of Mobile Terminals network.Prior art is when carrying out above-mentioned network search procedure; Because frequency sweep operates in time domain and carries out, the possible frequency of network is less at interval, and the frequency sweep step-length is short, frequency density is big; It is more to accomplish the frequency quantity that the frequency sweep of certain swept frequency range is directed against; More frequency quantity makes that the frequency switching times is frequent, and frequency sweep itself is switched thereupon prolonging total time of consuming with frequency, causes frequency sweep efficient lower.In addition, the network search procedure that adopts above-mentioned frequency sweep mode also has influence on the efficient of whole web search owing to the time in frequency sweep stage is longer.
Summary of the invention
In view of this, embodiment of the invention goal of the invention on the one hand is to provide a kind of wireless communication system frequency sweep method and related device, with minimizing frequency sweep number of times and frequency switching times, thereby improves frequency sweep efficient.
A kind of wireless communication system frequency sweep method that the embodiment of the invention provides comprises:
From the frequency sweep pattern, obtain candidate's frequency;
The time-domain signal of candidate's frequency is transformed to frequency domain, transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain;
Carry out energy and calculate the frequency domain energy window transforming to signal behind the frequency domain;
Select the frequency domain energy window to export as the frequency sweep result greater than the frequency of pre-set threshold value.
Embodiments of the invention also provide a kind of wireless communication system frequency-sweeping apparatus.This device comprises: acquiring unit, converter unit, computing unit and selected cell, wherein:
Said acquiring unit is used for obtaining candidate's frequency from the frequency sweep pattern;
Said converter unit is used for the time-domain signal of candidate's frequency is transformed to frequency domain, transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain;
Said computing unit is used for carrying out energy and calculating to obtain the frequency domain energy window transforming to signal behind the frequency domain;
Said selected cell is used to select the frequency domain energy window to export as the frequency sweep result greater than the frequency of pre-set threshold value.
In view of this, embodiment of the invention goal of the invention on the other hand is to provide a kind of wireless communication system method for searching network and corresponding terminal, searches net efficient with raising.
A kind of wireless communication system method for searching network that the embodiment of the invention provides comprises:
Obtain frequency series according to above-mentioned any wireless communication system frequency sweep method;
Frequency series is verified to confirm available frequency.
A kind of wireless communication system that the embodiment of the invention gives is searched network termination, and this terminal comprises: frequency-sweeping apparatus and authentication unit, wherein:
Said frequency-sweeping apparatus is aforementioned any wireless communication system frequency-sweeping apparatus;
Said authentication unit is used for candidate's frequency of selecting is verified to confirm available frequency.
The frequency sweep method and apparatus that the embodiment of the invention provides obtains candidate's frequency from the frequency sweep pattern after; Candidate's frequency is transformed to frequency domain; Transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain; The candidate's frequency that transforms to frequency domain is carried out energy calculate, the corresponding energy in each road of multiple connection selects the frequency domain energy window to export as the frequency sweep result greater than the frequency of pre-set threshold value to obtain the frequency domain energy window.Compared with prior art; The frequency sweep method and apparatus of the embodiment of the invention transforms to frequency domain with candidate's frequency and carries out energy calculating, because the frequency domain noise is little, the frequency sweep step-length is bigger with respect to time domain; Candidate's frequency quantity in the identical swept frequency range reduces; Candidate's frequency switching times, frequency sweep total degree reduce thereupon, thereby have shortened the frequency sweep time, have improved frequency sweep efficient.
Method for searching network that the embodiment of the invention provides and terminal verify the frequency series of obtaining and to confirm available frequency on aforementioned frequency sweep method and apparatus basis, with available frequency as communication network.Compared with prior art, because the frequency sweep process has reduced frequency sweep total degree and frequency switching times, practiced thrift the frequency sweep time; And the minimizing of candidate's frequency quantity makes disturbs the frequency number to reduce thereupon, has accelerated proof procedure; Shortened searching the net time of wireless communication system, improved and searched net efficient.
Description of drawings
Fig. 1 is the hardware structure diagram of frequency sweep process of the prior art;
Fig. 2 is the flow chart of frequency sweep method embodiment one of the present invention;
Fig. 3 is the flow chart of frequency sweep method embodiment two of the present invention;
Fig. 4 is the flow chart of frequency sweep method embodiment three of the present invention;
Fig. 5 is the hardware structure diagram of the said instance of Fig. 4;
Fig. 6 (a) is three groups of scan pattern sketch mapes of the said instance of Fig. 4;
Fig. 6 (b) is the sub-energy window frequency domain gain sketch map of the said instance of Fig. 4;
Fig. 6 (c) is that the sub-energy window of the said instance of Fig. 4 merges back frequency domain energy window gain sketch map;
Fig. 7 is the structured flowchart of frequency-sweeping apparatus embodiment of the present invention;
Fig. 8 is the flow chart of method for searching network embodiment of the present invention;
Fig. 9 searches the structured flowchart of network termination embodiment for the present invention.
Embodiment
For ease of understanding the technical scheme of the embodiment of the invention, the present invention is described in detail below in conjunction with accompanying drawing and embodiment.
Embodiment one
Referring to accompanying drawing 2, the figure shows one embodiment of the present of invention, this embodiment comprises:
Step S201: from the frequency sweep pattern, obtain candidate's frequency;
The frequency sweep pattern is the candidate's frequency set of carrying out frequency sweep, and the candidate's frequency in this set is within the frequency upper bound of the frequency lower bound of swept frequency range and swept frequency range.At communication technical field, candidate's frequency both can refer to some Frequency points, also can represent a frequency band, and when the expression frequency band, on behalf of this frequency band, any Frequency point that can choose in this frequency band carry out the frequency sweep operation.Candidate's frequency can generate according to preset formula, and candidate's frequency of generation can equidistantly distribute according to preset step-length in swept frequency range, also can not equidistantly distribute.The setting of frequency sweep step-length is for realizing that frequency sweep efficient has material impact, and is too much if candidate's frequency interval (frequency sweep step-length) is provided with, because The noise can't obtain correct frequency sweep result, and then causes searching the net failure; If candidate's frequency is provided with too smallly at interval, will increase frequency sweep number of times and frequency switching times, make time of frequency sweep process cost process, the setting at interval of candidate's frequency depend on to the estimation of noise with to frequency sweep result's requirement.
Step S202: the time-domain signal of candidate's frequency is transformed to frequency domain, transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain;
The time-domain signal of candidate's frequency is transformed to frequency domain can adopt multiple mode to realize, comparatively common mode is that candidate's frequency signal is carried out FFT conversion (fast fourier transform).Because the irregularities of noise when candidate's frequency is transformed into frequency domain, can filter out partial noise, thereby make and can the interval of candidate's frequency be increased, promptly transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain.It should be noted that: here to candidate's frequency relatively need carry out under the same conditions at interval; Candidate's frequency is when time domain; Frequency is presented as the time difference at interval; Candidate's frequency is when frequency domain, and frequency is presented as spectral distance at interval, should be transformed into to be all time domain or to be all under the frequency domain condition in the time of relatively and carry out.In practical application,, also can further eliminate the noise that possibly exist in the frequency signal in that the signal transformation of candidate's frequency was carried out down-sampling filtering before frequency domain according to the communication channel characteristics.
Step S203: carry out energy and calculate transforming to each signal behind the frequency domain, the corresponding energy result of calculation in each road of multiple connection is to obtain the frequency domain energy window;
After candidate's frequency transformed to frequency domain, the signal of candidate's frequency is carried out energy calculate, carry out the energy computation purpose and be to select the communication network of the satisfactory candidate's frequency of energy as wireless terminal.Alternatively, in practical application, in order to reduce noise, can same candidate's frequency be carried out frequency sweep through multichannel usually, the frequency sweep result to each road superposes then, and the embodiment of the invention also adopts this mode.Energy carries out multiple connection to the corresponding energy result of calculation in each road, to obtain the frequency domain energy window after calculating and accomplishing.The frequency domain energy window has reflected the energy state of candidate's frequency.
Step S204: select the frequency domain energy window to export as the frequency sweep result greater than the frequency of pre-set threshold value.
Because the frequency domain energy window has reflected the energy state of candidate's frequency, as long as those enough big corresponding frequencies of frequency domain energy window could be as the frequency sweep result.Therefore, obtain the corresponding frequency domain energy window of each candidate's frequency after, need frequency domain energy window and pre-set threshold value be compared, if greater than this pre-set threshold value, then with candidate's frequency of this frequency domain energy window correspondence as the frequency sweep result.The pre-set threshold value here is relevant with multiple factor, such as channel conditions quality, network type, the residing geographical environment of wireless terminal etc., in the actual application, can be provided with according to the reality that wireless terminal faces.In the actual application, in order to make the frequency domain energy window reliable and stable, step of carrying out above-mentioned S201 to S203 capable of circulation obtains a plurality of frequency domain energy windows, and a plurality of frequency domain energy windows are averaged computing, with operation result as final frequency domain energy window.
The frequency sweep method that present embodiment provides is obtained candidate's frequency from the frequency sweep pattern after; Candidate's frequency is transformed to frequency domain; Transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain; The candidate's frequency that transforms to frequency domain is carried out energy calculate, the corresponding energy in each road of multiple connection selects the frequency domain energy window to export as the frequency sweep result greater than the frequency of pre-set threshold value to obtain the frequency domain energy window.Compared with prior art; The frequency sweep method of present embodiment transforms to frequency domain with candidate's frequency and carries out energy calculating, because the frequency domain noise is little, the frequency sweep step-length is bigger with respect to time domain; Candidate's frequency quantity in the identical swept frequency range reduces; Candidate's frequency switching times, frequency sweep total degree reduce thereupon, thereby have shortened the frequency sweep time, have improved frequency sweep efficient.
Embodiment two
Embodiment one does the as a whole frequency sweep operation of carrying out with candidate's frequency, and this mode can reduce the total quantity that needs the candidate of frequency sweep frequency, reduces the frequency switching times.But; When candidate's frequency is represented candidate's frequency range, choose arbitrarily a frequency carry out frequency sweep possibly can not obtain frequency sweep result accurately, for fear of this situation; Can from candidate's frequency corresponding frequency band, mark off a plurality of sub-frequencies; Each sub-frequency carries out frequency sweep according to the mode of the foregoing description, though this processing mode has increased the number of times of frequency sweep operation and the number of times that frequency switches, can take into account the accuracy and the efficient of frequency sweep operation.When stating the frequency sweep process in realization, multi-transceiver technology also capable of using constitutes embodiments of the invention two thus to each sub-frequency subchannel frequency sweep.
Referring to accompanying drawing 3, present embodiment comprises:
Step S301: from the frequency sweep pattern, obtain candidate's frequency, said candidate's frequency corresponding frequency band comprises at least two sub-frequencies;
The concrete division number that candidate's frequency is divided into sub-frequency can confirm that according to actual conditions the generation of sub-frequency can generate simultaneously when candidate's frequency generates after the transmission flat characteristic of considering channel.The sub-frequency that generates can be uniformly distributed in the channel width, but also uneven distribution but calculate for ease, select even distribution mode usually, be f_ch such as the bandwidth of individual channel, the sub-frequency of division is L, is spaced apart f_ch/L between then sub-frequency.
Step S302: with the time-domain signal of the sub-frequency of each candidate's frequency respectively through a plurality of passages, the frequency band range that each passage is corresponding different;
Present embodiment adopts multi-transceiver technology, and each channel can be divided into a plurality of passages, and the frequency band range that each passage is corresponding is different, and such purpose is that the sub-frequency time-domain signal through passage is carried out " frequency spectrum " to be moved.During technical concrete realization; Can the digital signal of passing through after ADC changes through a plurality of NCO and channel filtering passage, be extracted a plurality of carrier signals respectively; Thereby make the sub-frequency time-domain signal that passes through on each passage " dislocation " on frequency domain, occur, realize that " frequency spectrum " move.
Step S303: the time-domain signal of each passage output is transformed to frequency domain;
Step S304: each signal after transforming to frequency domain is carried out energy calculating respectively;
Step S305: the energy result of calculation that merges each signal obtains sub-frequency domain energy window;
Each transforms to frequency domain after through a plurality of passages the frequency of candidate's frequency and carries out after energy meter calculates, and each passage forms energy block (block), if the port number that channel comprises is M, the number of the energy block that then obtains also is M.M energy block carried out gathering merging according to frequency coordinate, promptly obtain the sub-frequency domain energy window of a sub-frequency of candidate's frequency.When carrying out the combining energy piece; The part that also can extract gain stabilization in each energy block merges; The reason of operation is like this: there is flat characteristic in receive path; Promptly only smooth at mid portion, decay appears in the part that keeps to the side, and the data of flat sections were used to carry out energy and merge the unbalanced problem of gain in the passage band that can solve in the middle of each energy block only extracted.
Step S306: chooser frequency domain energy window is exported as the frequency sweep result greater than the frequency of pre-set threshold value.
Present embodiment is through utilizing multi-transceiver technology; With each channel distribution is a plurality of passages; The sub-frequency of each of candidate's frequency is simultaneously through behind a plurality of passages; Calculate through frequency domain transform and energy, the sub-frequency of candidate's frequency forms the frequent energy window of the son that comprises a plurality of energy blocks, utilizes this sub-frequency domain energy window to select frequency as the output result.Through the mode of present embodiment, on the one hand candidate's frequency is segmented, taken into account the accuracy and the efficient of frequency sweep; Adopt multichannel mechanism on the other hand, make that the frequency sweep process is more accurate than single channel frequency sweep.
It should be noted that: in practical application; In order to reduce noise, can the sub-frequency of same candidate be carried out frequency sweep through multichannel simultaneously usually, the frequency sweep result to each road carries out multiple connection then; Present embodiment also can adopt this mode; That is: to the sub-frequency of same candidate, repeat above-mentioned S302～S305 step, thereby obtain a plurality of sub-frequency domain energy windows; Obtain new, a sub-frequency domain energy window after optimizing through each sub-frequency domain energy window of multiple connection then, and then the selection that utilizes the sub-frequency domain energy window after this optimization to export frequency.
Embodiment three
In order to make technical scheme of the present invention more clear, explain with an instantiation below.Referring to accompanying drawing 4 and accompanying drawing 5, Fig. 4 is the flow chart of this instance, and Fig. 5 is the hardware structure diagram of this instance; Suppose that in this example antenna is 2, every channel comprises 4 number of sub-carrier, has 8 independent receive paths altogether; Last 4 passages and following 4 passage symmetries are carried out identical functions.This instance comprises:
Step 401: sweep parameters initialization, frequency sweep are counted K and are set to zero.Sweep parameters is to realize the important leverage of frequency sweep.Referring to table 1 and table 2, sweep parameters comprises initial frequency, frequency sweep step-length, frequency inventory etc., and these parameters need be carried out initialization according to system parameters before frequency sweep begins, and system parameters comprises swept frequency range, independent receive path bandwidth, receive path number etc.
Table 1: system parameters and implication table thereof
Table 2: sweep parameters and implication table thereof
| Sweep parameters | Meaning of parameters | Note |
| f0 | The frequency sweep step-length | The interval of the candidate's frequency in the frequency sweep pattern |
| f(i，j) | Candidate's frequency | The j of i candidate's frequency sub-frequency |
| K | The frequency sweep counting | The number of times that the frequency frequency sweep is carried out |
The frequency inventory is called " frequency sweep pattern " again, promptly comprises the set of candidate's frequency.It is 2 (j=2) that candidate's frequency in this instance comprises sub-frequency number; The distribution of sub-frequency is spaced apart f_ch; Then: (f (i, j)) can generate (shown in Fig. 6 (a), the figure shows the sub-frequency figure of three groups of candidate's frequencies) according to following formula to the sub-frequency of the candidate's frequency in the frequency sweep pattern.
f(i，1)＝fmin+f0/2
f(i，2)＝f(i，1)+f_ch/2
Candidate's frequency total quantity is fix (f_total/f0)+1.
Step S402: the initialization of sub-frequency frequency sweep, the sub-frequency of candidate's frequency are counted j and are set to zero.
Step S403: sub-frequency upgrades, i.e. j=j+1.The frequency renewal process can be switched the receiver frequency through the RF controller and obtain new frequency.
Step S404: the time-domain signal of the sub-frequency that will obtain is respectively through 4 passages; Frequency domain is arrived in the signal transformation of each passage output; Computational transformation extracts each energy block flat and merges to the energy block of each signal of frequency domain, obtains the corresponding sub-frequency domain energy window of sub-frequency.
This step is one of important step of this instance.The sub-frequency that this step will read is respectively through 4 passages; 4 each passages of passage calculate the back through frequency domain transform, energy and form an energy block; The flat that extracts the energy block of 4 passages then merges according to frequency coordinate and gathers, thereby obtains sub-frequency domain energy window.Referring to Fig. 6 (b), the figure shows gain diagram through the sub-energy window of frequency domain that calculates after the frequency sweep.To first frequency,, therefore, comprise 4 energy blocks (blcok) respectively through 2 sub-frequency f (1,1), the f (1,2) that exports after this step because the channel of this instance comprises 4 independent receive paths.
Step S405: each way frequency domain energy window of multiple connection obtains new sub-frequency domain energy window;
Referring to accompanying drawing 6 (c), the figure shows frequency domain energy window gain diagram after the sub-energy window multiple connection of this instance.4 passage scenes for this instance once obtain 8 block altogether, and each block data is gathered by frequency coordinate, have promptly obtained new sub-frequency domain energy window.
Step S406: judge that sub-frequency counts j and whether travel through and finish, if do not traveled through, then return step S403, traversal finishes in this way, then gets into step S407;
Step S407: judge whether frequency sweep counting K reaches preset value, if, execution in step S408 then, if not, execution in step S402 then;
Step S408: a plurality of sub-frequency domain energy windows are averaged computing, with the result of average calculating operation as final frequency domain energy window.
Step S409: chooser frequency domain energy window is exported as the frequency sweep result greater than the frequency of pre-set threshold value.
Embodiment four
The foregoing description has been introduced the embodiment of frequency sweep method of the present invention in detail, and the embodiment of the invention also provides frequency-sweeping apparatus.Shown in accompanying drawing 7, the figure shows wireless communication system frequency-sweeping apparatus embodiment provided by the invention.This device embodiment comprises: acquiring unit 701, converter unit 702, computing unit 703 and selected cell 704, wherein:
Said acquiring unit 701 is used for obtaining candidate's frequency from the frequency sweep pattern;
Said converter unit 702 is used for the time-domain signal of candidate's frequency is transformed to frequency domain, transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain;
Said computing unit 703 is used for carrying out energy and calculating to obtain the frequency domain energy window transforming to signal behind the frequency domain;
Said selected cell 704 is used to select the frequency domain energy window to export as the frequency sweep result greater than the frequency of pre-set threshold value.
The course of work of said apparatus embodiment is: acquiring unit 701 obtains candidate's frequency from the frequency sweep pattern; Through converter unit 702 time-domain signal of candidate's frequency is transformed to frequency domain then, transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain; The signal that 703 pairs of computing units transform to behind the frequency domain carries out energy calculating to obtain the frequency domain energy window; Selected cell 704 selects the frequency domain energy window to export as the frequency sweep result greater than the frequency of pre-set threshold value.
The frequency-sweeping apparatus that this device embodiment provides obtains candidate's frequency from the frequency sweep pattern after; Candidate's frequency is transformed to frequency domain; Transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain; The candidate's frequency that transforms to frequency domain is carried out energy calculate, select the frequency domain energy window to export as the frequency sweep result greater than the frequency of pre-set threshold value to obtain the frequency domain energy window.Compared with prior art; The frequency sweep method and apparatus of the embodiment of the invention transforms to frequency domain with candidate's frequency and carries out energy calculating, because the frequency domain noise is little, the frequency sweep step-length is bigger with respect to time domain; Candidate's frequency quantity in the identical swept frequency range reduces; Candidate's frequency switching times, frequency sweep total degree reduce thereupon, thereby have shortened the frequency sweep time, have improved frequency sweep efficient.
The described device of the foregoing description can also comprise Multi-connection unit 705, and this unit is used for the corresponding energy result of calculation in each road of multiple connection to obtain final frequency domain energy window.Here the purpose that increases Multi-connection unit is to reduce the noise jamming in the frequency sweep process.In the practical application; Usually can same candidate's frequency be carried out frequency sweep through multichannel simultaneously; Frequency sweep result to each road carries out multiple connection then; Obtain new, a frequency domain energy window after optimizing through each frequency domain energy window of multiple connection, and then the selection that utilizes the frequency domain energy window after this optimizations to export frequency, thereby make that the result of selection is more accurate.
Its corresponding frequency range of candidate's frequency that acquiring unit in the foregoing description obtains can comprise at least two sub-frequencies, calls above-mentioned each unit then each sub-frequency of candidate's frequency is carried out frequency sweep.Candidate's frequency is divided accuracy and the efficient that to take into account the frequency sweep result.The concrete number that sub-frequency is divided can confirm that according to actual conditions the generation of sub-frequency can generate simultaneously when candidate's frequency generates after the transmission flat characteristic of considering channel.
Candidate's frequency is carried out after sub-frequency divides, and the frequency sweep process of the foregoing description antithetical phrase frequency also can adopt multi-transceiver technology, carries out frequency sweep through a plurality of passages, thereby further improves frequency sweep result's accuracy.When adopting multi-transceiver technology; Apparatus of the present invention embodiment comprises and a plurality of one to one converter units of a plurality of passages and a plurality of computing unit; And merge cells; The time-domain signal that a plurality of converter units are respectively applied for respective channel output transforms to frequency domain, and a plurality of computing units are respectively applied for and carry out energy and calculate transforming to each signal behind the frequency domain; Merge cells merges each signal energy computation result to obtain sub-frequency domain energy, calls selected cell then and carries out follow-up work.After adopting multi-transceiver technology, said apparatus embodiment can also comprise and a plurality of one to one extracting units of a plurality of passages, is used for before merging each signal energy computation result, and the part that extracts gain stabilization among each signal energy computation result merges.Can solve the unbalanced problem of gain in the bandwidth chahnel through extracting unit.
Said apparatus embodiment can also comprise filter unit 706, is used for before candidate's frequency being transformed to frequency domain, candidate's frequency being carried out down-sampling filtering.But, help obtaining frequency sweep result accurately through filter unit filtering partial noise.
Said apparatus embodiment can also comprise averaging unit 707, is used for a plurality of frequency domain energy window value of averaging computing that each unit of the aforementioned frequency sweep of recursive call is obtained, with operation result as final frequency domain energy window.Can increase result's reliability through averaging computing.
Embodiment six
The foregoing description is described frequency sweep method provided by the invention or device embodiment in detail, and on the previous embodiment basis, the present invention also provides a kind of wireless communication system method for searching network embodiment.Referring to accompanying drawing 8, the figure shows the flow chart of method for searching network, present embodiment comprises:
Step S801: obtain frequency series through aforesaid wireless communication system frequency sweep method;
Step S802: frequency series is verified to confirm available frequency.
Obtain behind the available frequency the communication network of this frequency as mobile radio terminal.
The method for searching network that present embodiment provides verifies the frequency series of obtaining and to confirm available frequency on aforementioned frequency sweep method and apparatus basis, with available frequency as communication network.Compared with prior art, because the frequency sweep process has reduced frequency sweep total degree and frequency switching times, practiced thrift the frequency sweep time; And the minimizing of candidate's frequency quantity makes disturbs the frequency number to reduce thereupon, has accelerated proof procedure; Shortened searching the net time of wireless communication system, improved and searched net efficient.
After obtaining frequency series among the above-mentioned method for searching network embodiment, can directly verify one by one and confirm available frequency frequency series.But at the swept frequency range broad, the frequency series after the frequency sweep is more, if these frequency series are verified one by one, will increase the proving time.For this reason, the present invention preferably carries out preferably preferred frequency series being verified according to preset rules to the frequency series that obtains, thereby improves verification efficiency.The preset rules here can confirm according to actual conditions, verifies like preceding 50% the frequency that only will obtain frequency series, perhaps chooses in the frequency series the maximum frequency of energy and verifies or the like.
Corresponding with above-mentioned method for searching network, the present invention also provides a kind of wireless communication system to search network termination embodiment.Referring to Fig. 9, the figure shows the structured flowchart of searching network termination.This is searched network termination 900 and comprises: frequency-sweeping apparatus 901 and authentication unit 902, wherein:
Said frequency-sweeping apparatus 901 is aforementioned any wireless communication system frequency-sweeping apparatus;
Said authentication unit 902 is used for frequency series is verified to confirm available frequency.
This course of work of searching network termination is: frequency-sweeping apparatus 901 is verified to confirm available frequency, with the communication network of available frequency as mobile radio terminal by 902 pairs of frequency series of authentication unit after obtaining frequency series according to aforementioned any frequency sweep method.Likewise, originally search network termination and also can comprise selected cell 903, be used for the frequency series that obtains being carried out preferably to obtain preferred frequency according to preset rules.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of invention.
Claims (16)
1. wireless communication system frequency sweep method is characterized in that this method comprises:
From the frequency sweep pattern, obtain candidate's frequency;
The time-domain signal of candidate's frequency is transformed to frequency domain, transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain;
Carry out energy and calculate the frequency domain energy window transforming to signal behind the frequency domain;
Select the frequency domain energy window to export as the frequency sweep result greater than the frequency of pre-set threshold value.
2. method according to claim 1 is characterized in that, the frequency range that the candidate's frequency in the said frequency sweep pattern is corresponding comprises at least two sub-frequencies, and then: each the sub-frequency to candidate's frequency carries out the frequency sweep step.
3. method according to claim 2; It is characterized in that; The time-domain signal of each sub-frequency of said candidate's frequency is respectively through a plurality of passages; The frequency band range that each passage is corresponding different, then: the time-domain signal of candidate's frequency is transformed to frequency domain, carry out energy and calculate the frequency domain energy window and specifically comprise to transforming to signal behind the frequency domain:
The time-domain signal of each passage output is transformed to frequency domain; Carry out energy respectively and calculate transforming to each signal behind the frequency domain, the energy result of calculation that merges each signal obtains sub-frequency domain energy window so that chooser frequency domain energy window is exported as the frequency sweep result greater than the frequency of pre-set threshold value.
4. method according to claim 3 is characterized in that, before the energy result of calculation that merges each signal, the part that extracts gain stabilization among each signal energy computation result merges.
5. method according to claim 1 is characterized in that, before the time-domain signal with candidate's frequency transforms to frequency domain, the time-domain signal of candidate's frequency is carried out down-sampling filtering.
6. according to any one described method in the claim 1 to 5, it is characterized in that circulation is carried out aforementioned frequency sweep step obtaining a plurality of frequency domain energy windows, with the mean value of a plurality of frequency domain energy windows as final frequency domain energy window.
7. a wireless communication system frequency-sweeping apparatus is characterized in that, this device comprises: acquiring unit, converter unit, computing unit and selected cell, wherein:
Said acquiring unit is used for obtaining candidate's frequency from the frequency sweep pattern;
Said converter unit is used for the time-domain signal of candidate's frequency is transformed to frequency domain, transform between candidate's frequency of frequency domain the interval greater than between the corresponding candidate frequency at the interval of time domain;
Said computing unit is used for carrying out energy and calculating to obtain the frequency domain energy window transforming to signal behind the frequency domain;
Said selected cell is used to select the frequency domain energy window to export as the frequency sweep result greater than the frequency of pre-set threshold value.
8. device according to claim 7; It is characterized in that; The frequency range that candidate's frequency in the said frequency sweep pattern is corresponding comprises at least two sub-frequencies, then: call said converter unit, computing unit, selected cell each sub-frequency of candidate's frequency is carried out frequency sweep.
9. device according to claim 8; It is characterized in that; The time-domain signal of each sub-frequency of said candidate's frequency passes through a plurality of passages respectively, the frequency band range that each passage is corresponding different, and then: said device comprises and a plurality of one to one converter units of a plurality of passages and a plurality of computing unit; And merge cells, wherein:
The time-domain signal that a plurality of converter units are respectively applied for respective channel output transforms to frequency domain, and a plurality of computing units are respectively applied for and carry out energy and calculate transforming to each signal behind the frequency domain;
Said merge cells, the energy result of calculation that is used to merge each signal is to obtain sub-frequency domain energy;
Said selected cell is used for chooser frequency domain energy window and exports as the frequency sweep result greater than the frequency of pre-set threshold value.
10. device according to claim 9; It is characterized in that; Said device comprises also and a plurality of one to one extracting units of a plurality of passages that extracting unit is used for before the energy result of calculation that merges each signal, extracting the part of gain stabilization among each signal energy computation result.
11. device according to claim 7 is characterized in that, said device also comprises filter unit, is used for transforming to frequency domain at the time-domain signal with candidate's frequency and before the time-domain signal of candidate's frequency is carried out down-sampling filtering.
12. according to any one described device in the claim 7 to 11; It is characterized in that; Said device also comprises averaging unit, is used for a plurality of frequency domain energy window value of averaging computing that each unit of the aforementioned frequency sweep of recursive call is obtained, with operation result as final frequency domain energy window.
13. a wireless communication system method for searching network is characterized in that, this method comprises:
Obtain frequency series according to any wireless communication system frequency sweep method in the claim 1 to 6;
Frequency series is verified to confirm available frequency.
14. method according to claim 13 is characterized in that, obtains to carry out preferably obtaining preferred frequency according to preset rules after the frequency series.
15. a wireless communication system is searched network termination, this terminal comprises: frequency-sweeping apparatus and authentication unit, wherein:
Said frequency-sweeping apparatus is any wireless communication system frequency-sweeping apparatus in the claim 7 to 12;
Said authentication unit is used for the frequency series of frequency-sweeping apparatus output is verified to confirm available frequency.
16. terminal according to claim 15 is characterized in that, said terminal also comprises selected cell, is used for according to preset rules the frequency series that obtains being carried out preferably to obtain preferred frequency.
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| CN103731904A (en) * | 2012-10-10 | 2014-04-16 | 中国移动通信集团公司 | Method and device for controlling frequency point search and network side device and terminal |
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| CN108718308A (en) * | 2018-05-10 | 2018-10-30 | 清华大学 | A kind of communication system can verify that equipment identities, method and apparatus |
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