CN101471716B - Method for searching base station carrier frequency point of GSM directly-amplifying station - Google Patents
Method for searching base station carrier frequency point of GSM directly-amplifying station Download PDFInfo
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Abstract
The invention provides a method for searching base-station carrier frequency points in a repeater, which makes the judgment that whether the frequency points of all the channels within the working bandwidth of the global system for mobile communication (GSM) base station are base-station carrier frequency points. The method comprises the following steps: setting the local oscillation frequency point of a frequency selecting module; separating the signals that are coupled to the base-station antenna by the GSM repeater into single channels Cn; accounting the carrier power of the current channel Cn; resetting the local oscillation frequency point of the frequency selecting module; accounting the carrier powers of the two channels Cn minus 1 and Cn plus 1 neighbor to the current channel Cn, receptively; judging whether the frequency point (f0) of the current channel is the base-station carrier frequency point according to the carrier powers of the currently-accounted three channels; repeating the previous steps; making the judgment of all the channels within the working bandwidth of the GSM base station; and searching all the carrier frequency points of the GSM base station. The method ensures that the GSM repeater has the function of searching the base-station carrier frequency points, thereby accelerating the repeater construction speed and reducing the repeater construction cost; and ensures the GSM repeater is intelligentized.
Description
Technical field
The present invention relates to the Mobile communication direct base station field, particularly the method for GSM repeater search base station carrier frequency point.
Background technology
In recent years, the mobile communication cause was very fast in China's development, and mobile communications network covers the whole nation basically.But, need carry out the covering of blind area, base station in order to build the mobile communication overlay network of high-quality.Wireless with frequency-selecting wireless repeater is little owing to its investment frequently, stable performance, the speed of building a station is fast, and is low to environmental requirement, and installation and maintenance are easy, are a kind of equipment of good coverage hole.
In the GSM direct discharging station owing to much be carrier wave frequency-selecting machine; When engineering is opened the station; Must know the carrier frequency point of base station in advance or measure the frequency that base station transmit signals just can obtain carrier wave work through frequency spectrograph; This has delayed the repeater construction speed, and is high with the time-frequency spectrometer price, has increased construction cost.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, the method for a kind of GSM repeater search base station carrier frequency point is provided, make the GSM repeater possess the ability of search base station carrier frequency point, accelerated construction speed, reduced and opened the station cost; Make the repeater possess intelligent functions simultaneously.
The object of the invention is realized through following technical proposals: the method for this GSM repeater search base station carrier frequency point; Be whether frequency to all channels in the working frequency range of GSM base station is the judgement of base station carrier frequency all, said judgement may further comprise the steps:
(1) the local oscillator frequency f_lo of frequency-selecting module is set, is the GSM repeater individual channel Cn from the Signal Separation of antenna for base station coupling, and adds up the carrier power of current channel Cn, be designated as powe_mean;
(2) reset the local oscillator frequency f_lo of frequency-selecting module, add up adjacent two the channel C of current channel Cn respectively
N-1, C
N+1Carrier power, channel C
N-1Carrier power is designated as powe_mean0, channel Cn+1 carrier power is designated as powe_mean1;
(3) carrier power powe_mean, powe_mean0, the powe_mean1 according to 3 channels of current statistics judges whether the frequency f0 of current channel is the base station carrier frequency; Promptly when following 4 conditions are all set up; Frequency f0 is the base station carrier frequency so, otherwise frequency f0 is not the base station carrier frequency:
(a)powe_mean＞4*powe_mean0；
(b)powe_mean＞4*powe_mean1；
(c)powe_mean0＜2*powe_mean1；
(d)powe_mean1＜2*powe_mean0；
(4) repeat above-mentioned steps (1), (2), (3), all channels in the working frequency range of GSM base station are all carried out above-mentioned judgement, thereby search out all carrier frequency points of GSM base station.
Like this, the channel number of the carrier frequency point of searching for out according to said method just can be provided with the working frequency points of repeater fast.
For realizing the present invention better, said frequency-selecting module is connected to form by frequency mixer, VCO+PLL local oscillator generation module, if filter block, power detector module, one-chip computer module.
When adopting above-mentioned frequency-selecting module, in the said step (1), corresponding to current channel Cn, it is that VCO+PLL local oscillator generation module is output as fc+f0 or fc-f0 that the local oscillator frequency f_lo of said frequency-selecting module is provided with, and wherein, fc is the center frequency point of if filter block;
In the said step (2), corresponding to adjacent channel C
N-1, it is that VCO+PLL local oscillator generation module is output as fc+f0-200KHz or fc-f0-200KHz that the local oscillator frequency f_lo of said frequency-selecting module is provided with, wherein, fc is the center frequency point of if filter block; Corresponding to adjacent channel C
N+1, it is that VCO+PLL local oscillator generation module is output as fc+f0+200KHz or fc-f0-200KHz that the local oscillator frequency f_lo of said frequency-selecting module is provided with.
The present invention compared with prior art; Have following advantage and beneficial effect:, make the GSM repeater possess the ability of search base station carrier frequency point, when the outfield puts into operation when adopting the present invention; Need not carry frequency spectrograph; Just can know the working frequency points of GSM base station, accelerate construction speed greatly, reduce and opened the station cost.Simultaneously the repeater in the course of the work, through search base station carrier wave function, tracking base stations frequency that can be real-time; In case base station frequency point changes, can adjust the working frequency points of repeater automatically.Make the repeater possess intelligent functions.
Description of drawings
Fig. 1 is the structural representation of the said frequency-selecting module of method of GSM of the present invention repeater search base station carrier frequency point;
Fig. 2 is a GSM modulation spectrum characteristic sketch map;
Fig. 3 is the workflow sketch map of the method for GSM of the present invention repeater search base station carrier frequency point.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done to specify further, but execution mode of the present invention is not limited thereto.
Embodiment
As shown in Figure 1, the frequency-selecting module that the method for GSM of the present invention repeater search base station carrier frequency point adopts is connected to form by frequency mixer 201, VCO+PLL local oscillator generation module 202, if filter block 203 (intermediate frequency is fc), power detector module 204, one-chip computer module 205.
Fig. 2 is a GSM modulation spectrum characteristic sketch map, the spectral emission regulation and stipulation of GSM the transmitting power of neighboring trace, so most of concentration of energy in the band of 200KHz, promptly 200KHz is that the GSM channel number is minimum frequently at interval; According to this reason, the if filter block 203 of frequency-selecting module adopts the bandwidth of 200KHz.
As shown in Figure 3, for gsm system, the method for this repeater search base station carrier frequency point may further comprise the steps:
(1) VCO+PLL local oscillator generation module 202 is set, makes the local oscillator frequency f_lo of local oscillator module be fc+f0 or be fc-f0;
(2) output of more than 205 readout power wave detector of one-chip computer module module 204, and in one-chip computer module 205, do multiple averaging, preserve mean value powe_mean;
(3) VCO+PLL local oscillator generation module 202 is set, makes the local oscillator frequency f_lo of local oscillator module be fc+f0+200KHz or be fc-f0+200KHz;
(4) output of more than 205 readout power wave detector of one-chip computer module module 204, and in one-chip computer module 205, do multiple averaging, preserve mean value powe_meanl;
(5) VCO+PLL local oscillator generation module 202 is set, makes the local oscillator frequency f_lo of local oscillator module be fc+f0-200KHz or be fc-f0-200KHz;
(6) output of more than 205 readout power wave detector of one-chip computer module module 204, and in one-chip computer module 205, do multiple averaging, preserve mean value powe_mean0;
(7) according to powe_mean0, powe_mean and powe_mean1, judge whether current frequency f0 is the base station carrier frequency, promptly when following 4 conditions were all set up, frequency f0 was the base station carrier frequency so, otherwise frequency f0 is not the base station carrier frequency:
(a)powe_mean＞4*powe_mean0；
(b)powe_mean＞4*powe_mean1；
(c)powe_mean0＜2*powe_mean1；
(d)powe_mean1＜2*powe_mean0。
(8) repeat above-mentioned steps (1) to (7), all channels in the working frequency range of GSM base station are all carried out above-mentioned judgement, thereby search out all carrier frequency points of GSM base station.
Like this, the channel number of the carrier frequency point of searching for out according to said method just can be provided with the working frequency points of repeater fast.
As stated, can realize preferably that just the present invention, the foregoing description are merely preferred embodiment of the present invention, be not to be used for limiting practical range of the present invention; Be that all equalizations of doing according to content of the present invention change and modification, all contained by claim of the present invention scope required for protection.
Claims (3)
1.GSM the method for repeater search base station carrier frequency point is characterized in that being whether frequency to all channels in the working frequency range of GSM base station is the judgement of base station carrier frequency all, said judgement may further comprise the steps:
(1) the local oscillator frequency f_lo of frequency-selecting module is set, is the GSM repeater individual channel Cn from the Signal Separation of antenna for base station coupling, and adds up the carrier power of current channel Cn, be designated as powe_mean;
(2) reset the local oscillator frequency f_lo of frequency-selecting module, add up adjacent two the channel C of current channel Cn respectively
N-1, C
N+1Carrier power, channel C
N-1Carrier power is designated as powe_mean0, channel C
N+1Carrier power is designated as powe_mean1;
(3) carrier power powe_mean, powe_mean0, the powe_mean1 according to 3 channels of current statistics judges whether the frequency f0 of current channel is the base station carrier frequency; Promptly when following 4 conditions are all set up; Frequency f0 is the base station carrier frequency so, otherwise frequency f0 is not the base station carrier frequency:
(a)powe_mean＞4*powe_mean0；
(b)powe_mean＞4*powe_mean1；
(c)powe_mean0＜2*powe_mean1；
(d)powe_mean1＜2*powe_mean0；
(4) repeat above-mentioned steps (1), (2), (3), all channels in the working frequency range of GSM base station are all carried out above-mentioned judgement, thereby search out all carrier frequency points of GSM base station.
2. according to the method for the said GSM of claim 1 repeater search base station carrier frequency point, it is characterized in that: said frequency-selecting module is connected to form by frequency mixer, VCO+PLL local oscillator generation module, if filter block, power detector module, one-chip computer module.
3. according to the method for the said GSM of claim 2 repeater search base station carrier frequency point; It is characterized in that: in the said step (1); Corresponding to current channel Cn; It is that VCO+PLL local oscillator generation module is output as fc+f0 or fc-f0 that the local oscillator frequency f_lo of said frequency-selecting module is provided with, and wherein, fc is the center frequency point of if filter block;
In the said step (2), corresponding to adjacent channel C
N-1, it is that VCO+PLL local oscillator generation module is output as fc+f0-200KHz or fc-f0-200KHz that the local oscillator frequency f_lo of said frequency-selecting module is provided with, wherein, fc is the center frequency point of if filter block; Corresponding to adjacent channel C
N+1, it is that VCO+PLL local oscillator generation module is output as fc+f0+200KHz or fc-f0-200KHz that the local oscillator frequency f_lo of said frequency-selecting module is provided with.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101977089B (en) * | 2010-10-26 | 2013-07-31 | 三维通信股份有限公司 | GSM time-slot boundary detection method applied to GSM digital repeater |
| CN103596260B (en) * | 2012-08-17 | 2017-06-16 | 京信通信系统（中国）有限公司 | The slotted synchronous method and system of multicarrier gsm system |
| CN103684570B (en) * | 2012-09-18 | 2017-06-16 | 京信通信系统（中国）有限公司 | Search GSM base station carrier frequencies method, device and repeater |
| CN103944704B (en) * | 2014-04-18 | 2017-04-26 | 京信通信系统（中国）有限公司 | Carrier wave tracking method and device |
| CN109362126B (en) * | 2018-11-09 | 2022-05-06 | 京信网络系统股份有限公司 | Method, device and system for frequency point synchronization |
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| CN1395762A (en) * | 2000-01-18 | 2003-02-05 | 因芬尼昂技术股份公司 | Method and device for determining carrier frequency of base stations in mobile receiver of cellular mobile telephone system working with W-CDMA |
| CN1691815A (en) * | 2004-04-30 | 2005-11-02 | 北京信威通信技术股份有限公司 | A method for searching adjacent base stations by terminals in synchronous CDMA system |
| CN1797990A (en) * | 2004-12-27 | 2006-07-05 | 凯明信息科技股份有限公司 | Method for scanning frequency points in TDS-CDMA system |
| CN1797967A (en) * | 2004-12-24 | 2006-07-05 | 中兴通讯股份有限公司 | Send receive system in multicarrier based on shared channel, and implement method |
| CN101013901A (en) * | 2007-02-14 | 2007-08-08 | 北京天碁科技有限公司 | Method and apparatus for cell search |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1395762A (en) * | 2000-01-18 | 2003-02-05 | 因芬尼昂技术股份公司 | Method and device for determining carrier frequency of base stations in mobile receiver of cellular mobile telephone system working with W-CDMA |
| CN1691815A (en) * | 2004-04-30 | 2005-11-02 | 北京信威通信技术股份有限公司 | A method for searching adjacent base stations by terminals in synchronous CDMA system |
| CN1797967A (en) * | 2004-12-24 | 2006-07-05 | 中兴通讯股份有限公司 | Send receive system in multicarrier based on shared channel, and implement method |
| CN1797990A (en) * | 2004-12-27 | 2006-07-05 | 凯明信息科技股份有限公司 | Method for scanning frequency points in TDS-CDMA system |
| CN101013901A (en) * | 2007-02-14 | 2007-08-08 | 北京天碁科技有限公司 | Method and apparatus for cell search |
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