CN101646190A - Method and system for realizing automatic frequency search of GSM digital remote system - Google Patents
Method and system for realizing automatic frequency search of GSM digital remote system Download PDFInfo
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Abstract
The invention relates to a method and a system for realizing automatic frequency search of a GSM digital remote system. The method comprises the following steps: carrying out power scan on all GSM working frequency points at down-link by utilizing free working channel to obtain equivalent power of all frequency points; generating a new search frequency point list; updating the current working frequency point list according to the list; setting current operating frequency point list to base station-side equipment of the remote system; and broadcasting the current operating frequency point listto all far-ends by a system communication link, so as to realize automatic frequency search.
Description
Technical field
The present invention relates to a kind of method and system of the GSM of realization digital remote system automatic frequency search.
Background technology
The GSM digital remote system adopts independent channel that all working carrier wave is sampled, transmitted, have and disturb for a short time, the speech quality height, can realize the advantages such as inhibition of making an uproar of the up end, but in a single day the carrier frequency period changes, need manually the equipment work frequency to be reset, flexibility is lower.GSM wideband digital far-drawing system adopts single high speed channel that all carrier channels are realized that digitlization is zoomed out, signal regeneration, possess applying flexible, but the descending spurious signal of equipment is wayward, and the base station uplink interference obviously is better than frequency-selective system.According to above two kinds of equipment characteristics, the comprehensive above two kinds of equipment characteristics of the present invention are realized the automatic frequency point function of search, have realized that the advantage of two kinds of equipment is comprehensive.
Summary of the invention
The invention discloses a kind of method of the GSM of realization digital remote system automatic frequency search, may further comprise the steps: after step (1) digital remote system is opened, utilize the idle channel in the system that all working frequency in the gsm system down link is scanned, promptly change the centre frequency of idle channel, simultaneously digitized carrier signal is carried out the calculating of equivalent power value, obtain the equivalent power value of each working frequency points correspondence; Step (2) is obtained the maximum in the described equivalent power value after the equivalent power value search of all GSM working frequency points correspondences is finished, power is thought to be effective frequency greater than the frequency of 0.1 times of maximum, joins the tabulation of new search frequency; Step (3) is according to the GSM operating specification, and the continuous adjacent frequency to existing in the tabulation of new search frequency keeps the wherein bigger frequency of equivalent power value, upgrades the tabulation of new search frequency; Frequency in the tabulation of step (4) new search Frequency point has limit priority, delete in the tabulation of current operation frequency with the tabulation of new search frequency in the adjacent frequency of frequency, new search to frequency be increased in the tabulation of current operation frequency, the frequency priority level that exists in the current operation frequency tabulation is adjusted, when current operation frequency tabulation intermediate-frequeney point number surpasses maximum channel number, the minimum frequency of deletion priority; Step (5) is set to the far-drawing system base station end device with the tabulation of current operation frequency, thereby and is broadcast to all far-ends by the system communication link and realizes automatic frequency search.
Adopt the advantage of GSM digital remote system of the present invention to be: the equipment that increased substantially is exported spuious index, effectively reduces the interference of far-drawing system to base station and neighbor cell, has improved network service quality, has widened digital remote system and has been suitable for scene; The automatic frequency search function has effectively improved the equipment flexibility ratio simultaneously, under the situation that base station frequency point changes, do not need equipment is carried out human configuration, reduce repeater network use cost, reduced operating cost of operator, improved the vitality of digital remote system largely.
Description of drawings
Fig. 1 is according to system block diagram of the present invention;
Fig. 2 is the flow chart according to generation new search frequency tabulation of the present invention;
Fig. 3 is according to frequency priority of the present invention adjustment and produces the flow chart of final current operation frequency tabulation.
Embodiment
In order to use purpose of the present invention, technical scheme and advantage more clear, below with reference to accompanying drawing, the present invention is described in more detail:
With reference to Fig. 1, this figure is a system block diagram of the present invention, and comprising AD conversion chip, finite impulse response FIR low pass filter, power detection module and CPU, wherein CPU is used for the default and power detection control of frequency.
Referring to figs. 2 and 3, the specific implementation process is: the first step, and behind the GSM digital remote system opening of device, the working frequency points tabulation (being called tabulation 1) before at first recovering to restart from memory as equipment initialization frequency, and is opened the relevant work channel;
Second step, in the current working frequency tabulation all frequency priority be set to the highest, suppose current working frequency for 5,10,15,20,25,30,35,40,45,50,55,60,65}, 13 frequencies altogether, its priority is for the highest, and coefficient is 10;
The 3rd step, utilize idle channel that all GSM working frequency points are carried out power scan, promptly change the centre frequency of idle channel, concrete scanning process is as follows:
The method that described FPGA detects frequency comprises the steps:
The a certain idle channel of CPU configuration mould/number conversion chip is a test channel;
CPU presets mould/pairing frequency of number conversion chip testing passage;
Carry out mixing and filtering with the test channel frequency preset again after the GSM to be measured that mould/number conversion chip will be imported is signal digitalized, obtain down-conversion signal; If the GSM signal frequency of input is identical with the test channel frequency preset, then test channel is output as baseband signal (being digitized carrier signal), otherwise is adjacent signal frequently;
With the data of test channel output through a low pass filter, the adjacent signal frequently of filtering;
CPU notice on-site programmable gate array FPGA (being the power detection module among Fig. 1) beginning frequency measuring ability;
After on-site programmable gate array FPGA detects the frequency measuring ability and enables, beginning power of data behind the statistical filtering in about 2 reframing time length, if detect number of times greater than a certain threshold value n more than or equal to m time in this time period, then this time detected value is adding up of m detection power; If detect number of times greater than a certain threshold value n in the period less than m time at this section, then this time detected value is 0;
On-site programmable gate array FPGA reports the equivalent power detected value of this predeterminated frequency correspondence;
Under the control of CPU, FPGA repeats above-mentioned steps, finishes until all frequency point scannings;
Obtain the performance number of each frequency correspondence that FPGA reports, finish the frequency point scanning measuring ability.
The 4th step, finish scanning after, known the equivalent power value of all frequencies.Find out wherein power maximum, and be worth as benchmark with this remaining frequency is carried out power screening, power is thought to be effective frequency greater than the Frequency point of 0.1 times of maximum, joins new search frequency tabulation (being called tabulation 2).Suppose scanning result such as following table:
According to above description content, then the power maximum is No. 5 frequencies in this example, and its performance number is 10000, and according to the power screening conditions, all new search frequencies are all effective in the table.
The 5th step, according to GSM frequency planning principles, in same sub-district, can not use two adjacent frequencies simultaneously, adjacent frequency is screened to tabulating in 2, such as No. 5 and No. 6 frequencies, after equivalent performance number compared, keep wherein No. 5 bigger frequencies of equivalent power value, No. 6 less frequencies of deletion equivalent power value, by that analogy.Then can delete No. 6 and No. 16 frequencies, it is as follows upgrading tabulation 2:
In the 6th step, will tabulate 21 comprehensively compares with tabulation, tabulates promptly with current new search that table 2 be that limit priority is other, and the deletion adjacent frequency of the frequency with in the table 2 in 1 of tabulating removes frequency No. 25, and then the tabulation 1 after the renewal is as follows:
The 7th step, to adjust according to up-to-date Search Results his-and-hers watches 1 intermediate-frequeney point priority, the adjustment principle is: whenever finish once search, the frequency priority that is present in the table 1 that searches increases by 1, and limit priority is 10, otherwise priority reduces 1, and minimum is 0.If the frequency that new search arrives be increased in the tabulation 1, and priority is for the highest.Then be to the 1 renewal back result that tabulates:
The 8th step, if frequency points surpasses the maximum functional number of channel of GSM radio frequency stretch system, then delete corresponding frequency from low to high according to priority level, then, should delete frequency No. 30 according to tabulation 1 situation.Then be to the 1 renewal back result that tabulates:
The 9th step was set to the tabulation of the frequency after upgrading in the far-drawing system base station end device, thereby and was broadcast to all far-ends by the system communication link and realizes automatic frequency search.Circulate by above step.
Claims (6)
1. method that realizes GSM digital remote system automatic frequency search is characterized in that may further comprise the steps:
After step (1) digital remote system is opened, utilize the idle channel in the system that all working frequency in the gsm system down link is scanned, promptly change the centre frequency of idle channel, simultaneously digitized carrier signal is carried out the calculating of equivalent power value, obtain the equivalent power value of each working frequency points correspondence;
Step (2) is obtained the maximum in the described equivalent power value after the equivalent power value search of all GSM working frequency points correspondences is finished, power is thought to be effective frequency greater than the frequency of 0.1 times of maximum, joins the tabulation of new search frequency;
Can not there be adjacent frequency according to GSM frequency planning principles in step (3) in same sub-district, and the continuous adjacent frequency that exists in the tabulation of new search frequency is screened, and keeps the wherein bigger frequency of equivalent power value, upgrades the tabulation of new search frequency;
Frequency in the tabulation of step (4) new search Frequency point has limit priority, delete in the tabulation of current operation frequency with the tabulation of new search frequency in the adjacent frequency of frequency, new search to frequency be increased in the tabulation of current operation frequency, the frequency priority level that exists in the current operation frequency tabulation is adjusted, when current operation frequency tabulation intermediate-frequeney point number surpasses maximum channel number, the minimum frequency of deletion priority;
Step (5) is set to the far-drawing system base station end device with the tabulation of current operation frequency, thereby and is broadcast to all far-ends by the system communication link and realizes automatic frequency search.
2. method according to claim 1 is characterized in that described in the step (1) digitized carrier signal being carried out the calculating of equivalent power value, and the equivalent power value that obtains each working frequency points correspondence further comprises:
(a) a certain idle channel of CPU configuration mould/number conversion chip is a test channel;
(b) the default mould of CPU/pairing frequency of number conversion chip testing passage;
(c) mould/number conversion chip GSM to be measured that will import carries out mixing and filtering with the test channel frequency preset after signal digitalized again, obtains down-conversion signal; If the GSM signal frequency of input is identical with the test channel frequency preset, then test channel is output as baseband signal, otherwise is adjacent signal frequently;
(d) data that test channel is exported are through a low pass filter, and the filtering neighbour is signal frequently;
(e) CPU notice on-site programmable gate array FPGA begins the frequency measuring ability;
(f) after on-site programmable gate array FPGA detects the frequency measuring ability and enables, beginning power of data behind the statistical filtering in about 2 reframing time length, if detect number of times greater than a certain threshold value n more than or equal to m time in this time period, then this time detected value is adding up of m detection data; If detect number of times greater than a certain threshold value n in the period less than m time at this section, then this time detected value is 0;
(g) on-site programmable gate array FPGA reports the equivalent power detected value of this predeterminated frequency correspondence;
(h) repeated execution of steps (b)-(g) finishes until all frequency point scannings.
3. method according to claim 1 and 2 is characterized in that described in the step (4) the frequency priority level that exists in the current operation frequency tabulation adjusted further and comprises:
Step (i) if new search to the frequency that is present in the tabulation of current operation frequency, then this frequency priority increases by 1, otherwise priority reduces 1, if for limit priority then do not change priority, minimum is 0, and the priority of the frequency that new search arrives is for the highest.
4. system that realizes GSM digital remote system automatic frequency search is characterized in that:
A module, be used for after digital remote system is opened, utilize the idle channel in the system that all working frequency in the gsm system down link is scanned, promptly change the centre frequency of idle channel, simultaneously digitized carrier signal is carried out the calculating of equivalent power value, obtain the equivalent power value of each working frequency points correspondence;
A module is used for obtaining the maximum in the described equivalent power value after the equivalent power value search of all GSM working frequency points correspondences is finished, and power is thought to be effective frequency greater than the frequency of 0.1 times of maximum, joins the tabulation of new search frequency;
A module is used for can not having adjacent frequency according to GSM frequency planning principles in same sub-district, and the continuous adjacent frequency that exists in the tabulation of new search frequency is screened, and keeps the wherein bigger frequency of equivalent power value, upgrades the tabulation of new search frequency;
A module, be used for making the frequency of new search Frequency point tabulation to have limit priority, delete in the tabulation of current operation frequency with the tabulation of new search frequency in the adjacent frequency of frequency, new search to frequency be increased in the tabulation of current operation frequency, the frequency priority level that exists in the current operation frequency tabulation is adjusted, when current operation frequency tabulation intermediate-frequeney point number surpasses maximum channel number, the minimum frequency of deletion priority;
A module is used for the tabulation of current operation frequency is set to the far-drawing system base station end device, thereby and is broadcast to all far-ends by the system communication link and realizes automatic frequency search.
5. system that realizes GSM digital remote system automatic frequency search is characterized in that:
CPU, the a certain idle channel that is used to dispose mould/number conversion chip is a test channel, default mould/pairing the frequency of number conversion chip testing passage, after knowing the equivalent power value of all frequencies, obtain the maximum in the described equivalent power value, power is greater than the frequency of 0.1 times of maximum, think and be effective frequency, join the tabulation of new search frequency, according to GSM frequency planning principles, can not there be adjacent frequency in same sub-district, the continuous adjacent frequency that exists in the tabulation of new search frequency is screened, keep the wherein bigger frequency of equivalent power value, upgrade the tabulation of new search frequency, frequency in the tabulation of new search Frequency point has limit priority, delete in the tabulation of current operation frequency with the tabulation of new search frequency in the adjacent frequency of frequency, new search to frequency be increased in the tabulation of current operation frequency, the frequency priority level that exists in the current operation frequency tabulation is adjusted, when current operation frequency tabulation intermediate-frequeney point number surpasses maximum channel number, the minimum frequency of deletion priority forms the frequency tabulation after upgrading;
Mould/number conversion chip is used for the GSM to be measured of input is carried out mixing and filtering with the test channel frequency preset after signal digitalized again, obtains down-conversion signal; If the GSM signal frequency of input is identical with the test channel frequency preset, then test channel is output as baseband signal, otherwise is adjacent signal frequently;
Low pass filter is used for the adjacent signal frequently of the data filtering of test channel output;
Power detection module begins the frequency measuring ability according to the control of CPU, reports the equivalent power detected value of this predeterminated frequency correspondence.
6. system according to claim 5, it is characterized in that: after described power detection module detects the frequency measuring ability and enables, beginning power of data behind the statistical filtering in about 2 reframing time length, if detect number of times greater than a certain threshold value n more than or equal to m time in this time period, then this time detected value is adding up of m detection power; If detect number of times greater than a certain threshold value n in the period less than m time at this section, then this time detected value is 0.
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| CN102368867A (en) * | 2011-11-16 | 2012-03-07 | 三维通信股份有限公司 | Automatic frequency-selecting GSM (Global System for Mobile Communication) digital optical fiber repeater and realizing method thereof |
| CN102625327A (en) * | 2012-03-09 | 2012-08-01 | 奥维通信股份有限公司 | Automatic frequency point tracking method for digital intermediate frequency optical fiber repeater |
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| CN101977421A (en) * | 2010-09-08 | 2011-02-16 | 京信通信***（中国）有限公司 | Multi-frequency point rapid scanning method |
| CN101977421B (en) * | 2010-09-08 | 2013-10-02 | 京信通信***（中国）有限公司 | Multi-frequency point rapid scanning method |
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| CN102625327A (en) * | 2012-03-09 | 2012-08-01 | 奥维通信股份有限公司 | Automatic frequency point tracking method for digital intermediate frequency optical fiber repeater |
| CN102625327B (en) * | 2012-03-09 | 2016-07-06 | 奥维通信股份有限公司 | Digital intermediate frequency optical fiber repeater frequency automatic tracking method |
| CN106856588A (en) * | 2015-12-09 | 2017-06-16 | 展讯通信（上海）有限公司 | The frequency choosing method and device of bluetooth equipment |
| CN106856588B (en) * | 2015-12-09 | 2021-02-26 | 展讯通信（上海）有限公司 | Frequency point selection method and device for Bluetooth equipment |
| CN116094637A (en) * | 2023-04-13 | 2023-05-09 | 成都德芯数字科技股份有限公司 | Emergency broadcast command signal identification method and system for medium wave amplitude modulation broadcast |
| CN116094637B (en) * | 2023-04-13 | 2023-06-23 | 成都德芯数字科技股份有限公司 | Emergency broadcast command signal identification method and system for medium wave amplitude modulation broadcast |
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