CN102404839A - Synchronous locking method and wireless telecommunication device - Google Patents
Synchronous locking method and wireless telecommunication device Download PDFInfo
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- CN102404839A CN102404839A CN2010102776589A CN201010277658A CN102404839A CN 102404839 A CN102404839 A CN 102404839A CN 2010102776589 A CN2010102776589 A CN 2010102776589A CN 201010277658 A CN201010277658 A CN 201010277658A CN 102404839 A CN102404839 A CN 102404839A
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Abstract
The invention provides a synchronous locking method and a wireless telecommunication device. The synchronous locking method includes that the wireless telecommunication device performs down-conversion processing on radio-frequency signals coming from an Acer stand based on local oscillation signals so as to generate intermediate-frequency signals, frequency deviation value of the intermediate-frequency signals relative to a theoretical intermediate frequency is calculated, and frequency of the local oscillation signals is regulated according to the frequency deviation value so as to lead the absolute value of a new frequency deviation value calculated after another radio-frequency signals coming from the Acer stand are received again is smaller than a preset frequency deviation threshold value. Based on the radio-frequency signals coming from the Acer stand, synchronous locking of a clock is achieved, out-of-step of the clock caused by failure of a global position system (GPS) is avoided, accuracy of the clock can be maintained in a long period, and accordingly stability and reliability of clock synchronization are improved. In addition, a GPS module is not needed to be arranged, thereby being favorable for simplifying design of a synchronous system, lessening size of the device and reducing production cost and construction complexity.
Description
Technical field
The present invention relates to a kind of genlocing method and Wireless Telecom Equipment, belong to wireless communication field.
Background technology
Wireless Telecom Equipment; Like little base station, from the base station, equipment such as the vehicle-mounted repeater of high ferro need carry out signal processing based on the high accuracy clock synchro system, therefore, existing Wireless Telecom Equipment; Generally all to use global positioning system (Globe Positioning System; Be called for short: GPS) module, come the clock of locking device with its pps pulse per second signal that provides, to realize clock synchronization.
At least having following problem: GPS in the prior art is not extremely reliable system, can receive the influence of many X factors such as GPS receiver performance, weather, geographical position, external environment, Sino-U.S.'s strategy relations; When GPS lost efficacy, the clock system step-out will take place, thereby cause the clock performance variation, and then cause the signal processing mistake; In addition, GPS module volume is big, cost is high, and will install the GPS reception antenna, the complexity height of therefore constructing.
For addressing the above problem, common practice of the prior art is to adopt high-precision thermostatic control crystal oscillator (Oven Controlled Crystal Oscillator, abbreviation: OCXO), after GPS lost efficacy, utilize OCXO to keep clock accuracy.But the shortcoming of this way is OCXO only can keep clock accuracy within a short period of time, because GPS can't carry out genlocing after losing efficacy, therefore when the GPS out-of-service time is longer, can't keep clock accuracy.
Summary of the invention
The present invention provides a kind of genlocing method and Wireless Telecom Equipment, in order under the situation of not using the GPS module, to realize the genlocing of clock system.
One aspect of the present invention provides a kind of genlocing method, comprising:
Wireless Telecom Equipment carries out down-converted based on local oscillation signal to the radiofrequency signal that comes from macro base station, generates intermediate-freuqncy signal;
Calculate the frequency deviation value of said intermediate-freuqncy signal with respect to theoretical IF-FRE;
Adjust the frequency of said local oscillation signal according to said frequency deviation value, make the absolute value of receiving the new frequency deviation value that calculates after another radiofrequency signal that comes from said macro base station once more less than preset frequency deviation threshold value.
The present invention provides a kind of Wireless Telecom Equipment on the other hand, comprising:
Frequency synthesizer is used to generate local oscillation signal;
The treatment channel module is used for the said local oscillation signal based on the frequency synthesizer generation, the radiofrequency signal that comes from macro base station is carried out down-converted generate intermediate-freuqncy signal;
Computing module is used for the frequency deviation value of the said intermediate-freuqncy signal of computing channel module generation with respect to theoretical IF-FRE;
The frequency deviation adjusting module; Be used for said frequency deviation value according to the computing module generation; The frequency of the said local oscillation signal that the synthesizer of adjusting frequency generates makes the absolute value of receiving the new frequency deviation value that is calculated by computing module after another radiofrequency signal that comes from said macro base station once more less than preset frequency deviation threshold value.
The present invention is based on the radiofrequency signal that comes from macro base station and realized the genlocing of clock, prevented the clock step-out that lost efficacy and cause owing to GPS, and can keep clock accuracy in a long time, thereby improved the stability and the reliability of clock synchronization; And owing to the GPS module need be set, therefore also help and simplify the synchro system design, the reduction equipment volume, and reduce production costs, reduce the construction complexity.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of genlocing method embodiment one according to the invention;
Fig. 2 is the flow chart of genlocing method embodiment two according to the invention;
Fig. 3 is the structural representation of Wireless Telecom Equipment embodiment one according to the invention;
Fig. 4 is the structural representation of Wireless Telecom Equipment embodiment two according to the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 1 is the flow chart of genlocing method embodiment one according to the invention, and is as shown in the figure, and this method comprises the steps:
Wherein, macro base station is meant the base station of having realized genlocing with GPS or Beidou satellite navigation system etc., therefore can guarantee that the radiofrequency signal that macro base station sends is the signal after the genlocing; In addition, because radio frequency signal frequency is higher, can make it become intermediate-freuqncy signal through down-converted, so that the correlation module device carries out handled.
Wherein, said frequency deviation value is meant frequency values poor of theoretical IF-FRE value and the actual intermediate-freuqncy signal that obtains of the radiofrequency signal of macro base station emission.The calculating of concrete frequency deviation value can control that (Auto Frequency Control, be called for short: AFC) algorithm or other adopt existing method to realize, repeat no more based on automatic frequency here.
Particularly, can adjust crystal oscillator voltage according to said frequency deviation value earlier, thereby adjustment is by the frequency of the clock reference signal of said crystal oscillator generation; Generate said new local oscillation signal according to adjusted said clock reference signal then, to realize frequency adjustment to local oscillation signal.After this; When receiving another radiofrequency signal that comes from said macro base station once more; Carry out down-converted based on carrying out the adjusted local oscillation signal of frequency, generate new intermediate-freuqncy signal, the calculating through step 102 generates new frequency deviation value again; So that the absolute value of new frequency deviation value diminishes gradually, finally less than preset frequency deviation threshold value.
Wherein, Said frequency deviation value maybe on the occasion of or negative value; Frequency to show actual intermediate-freuqncy signal is compared bigger than normal or less than normal with the theoretical IF-FRE of the radiofrequency signal of macro base station emission; The absolute value of frequency deviation value almost is difficult in practice realize because frequency deviation value is zero situation, therefore in this step, is provided with preset frequency deviation threshold value, as long as then can confirm to realize to receive the genlocing of signal less than presetting the frequency deviation threshold value.
The said method of present embodiment has realized the genlocing to clock based on the radiofrequency signal that comes from macro base station; Prevented the clock step-out that lost efficacy and to cause owing to GPS; And can keep clock accuracy in a long time, thereby the stability and the reliability of clock synchronization have been improved; And owing to need not use the GPS module, therefore also help and simplify the synchro system design, the reduction equipment volume, and reduce production costs.
Fig. 2 is the flow chart of genlocing method embodiment two according to the invention, and is as shown in the figure, and present embodiment had also further increased following steps before execution in step 103 on the basis of said method embodiment one:
In the frequency deviation value that calculates through above-mentioned steps 102 except comprising the frequency deviation that causes by the local clock lock-out; Also comprised the frequency deviation that Wireless Telecom Equipment is caused by Doppler effect during with respect to the macro base station high-speed mobile with vehicles such as high-speed railways; The influence that the genlocing process is caused for the frequency deviation that reduces to cause by Doppler effect; Through setting up above-mentioned steps 100; Have only when said translational speed surpasses said pre-set velocity threshold value; Promptly have only when Wireless Telecom Equipment is in low speed or inactive state with respect to macro base station, just to begin to carry out the genlocing process of introducing in the above-mentioned steps 103, when Wireless Telecom Equipment is in fast state with respect to macro base station, then do not begin to carry out the genlocing process of introducing in the above-mentioned steps 103.
Help reducing the influence that the frequency deviation that caused by Doppler effect causes the genlocing process through the said method of present embodiment, thereby improve the accuracy of genlocing.Need to prove here,,, therefore then need not in this case to set up above-mentioned steps 100, get final product and directly carry out above-mentioned steps 103 owing to Doppler effect can not take place for non-high-speed mobile or static Wireless Telecom Equipment.
Fig. 3 is the structural representation of Wireless Telecom Equipment embodiment one according to the invention; As scheme said; For realizing above-mentioned genlocing method, comprise in this Wireless Telecom Equipment: frequency synthesizer 10, treatment channel module 20, computing module 30 and frequency deviation adjusting module 40.Its operation principle is following:
After this; By the said frequency deviation value of frequency deviation adjusting module 40 according to computing module 30 generations; The frequency of the said local oscillation signal that the synthesizer 10 of adjusting frequency generates makes the absolute value of receiving the new frequency deviation value that is calculated by computing module 30 after another radiofrequency signal that comes from said macro base station once more less than preset frequency deviation threshold value.
Particularly, as shown in Figure 3, this frequency deviation adjusting module 40 can comprise crystal oscillator 41 and voltage-adjusting unit 42.Wherein, Crystal oscillator 41 is used for producing the clock reference signal according to the magnitude of voltage of setting; After aforementioned calculation module 30 generates frequency deviation value; The said frequency deviation value that is generated according to computing module 30 by voltage-adjusting unit 42 is earlier adjusted the voltage of said crystal oscillator 41, thereby adjustment is by the frequency of the clock reference signal of said crystal oscillator 41 generations; And then generate said new local oscillation signal according to voltage-adjusting unit 42 adjusted said clock reference signals by said frequency synthesizer 10, to realize frequency adjustment to local oscillation signal.After this; When receiving another radiofrequency signal that comes from said macro base station once more; Carry out down-converted by treatment channel module 20 based on carrying out the adjusted local oscillation signal of frequency once more, generate new intermediate-freuqncy signal, calculate by computing module 30 and generate new frequency deviation value; So that the absolute value of new frequency deviation value diminishes gradually, finally less than preset frequency deviation threshold value.The related description of relevant preset frequency deviation threshold value sees also the related content of said method embodiment, repeats no more here.
Wherein, Above-mentioned crystal oscillator 41 can adopt the crystal oscillator of different types according to the different synchronization time interval; For example; When the said Wireless Telecom Equipment of present embodiment is the vehicle-mounted repeater of high ferro etc. can receive the mobile signal equipment of the radiofrequency signal that comes from macro base station the time, because clock system only could be synchronously under low speed or inactive state, said crystal oscillator 41 can adopt the higher OCXO of stability; And when said Wireless Telecom Equipment be little base station or can receive the static communication equipment of the radiofrequency signal that comes from macro base station from the base station etc. the time; Because clock system is in static synchronous regime always; 41 of said crystal oscillators can adopt stability poor slightly; But still can satisfy temperature-compensating crystal oscillator (TemperatureCompensate Oscillator, the abbreviation: TCXO) that corresponding accuracy Design requires.And TCXO is that with respect to the advantage of OCXO cost is lower, and volume is littler, thereby helps further reducing the cost and the volume of Wireless Telecom Equipment.
The said equipment of present embodiment has been realized genlocing to received signal based on the radiofrequency signal that comes from macro base station; Prevented the clock step-out that lost efficacy and to cause owing to GPS; And can keep clock accuracy in a long time, thereby the stability and the reliability of clock synchronization have been improved; And owing to need not use the GPS module, therefore also help and simplify the synchro system design, the reduction equipment volume, and reduce production costs.
Fig. 4 is the structural representation of Wireless Telecom Equipment embodiment two according to the invention; As scheme said; This Wireless Telecom Equipment further comprises speed judge module 50; Be used to judge whether said Wireless Telecom Equipment surpasses the pre-set velocity threshold value with respect to the translational speed of said macro base station, have only when speed judge module 50 is judged said translational speed and surpassed said pre-set velocity threshold value the said frequency deviation value that said frequency deviation adjusting module 40 just generates according to computing module 30; The frequency of the said local oscillation signal that the synthesizer 10 of adjusting frequency generates, and then carry out follow-up genlocing process.
Help reducing the influence that the frequency deviation that caused by Doppler effect causes the genlocing process through the said equipment of present embodiment, thereby improve the accuracy of genlocing.Concrete principle explanation can be repeated no more referring to the related content of said method embodiment two here.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (10)
1. a genlocing method is characterized in that, comprising:
Wireless Telecom Equipment carries out down-converted based on local oscillation signal to the radiofrequency signal that comes from macro base station, generates intermediate-freuqncy signal;
Calculate the frequency deviation value of said intermediate-freuqncy signal with respect to theoretical IF-FRE;
Adjust the frequency of said local oscillation signal according to said frequency deviation value, make the absolute value of receiving the new frequency deviation value that calculates after another radiofrequency signal that comes from said macro base station once more less than preset frequency deviation threshold value.
2. method according to claim 1 is characterized in that, the frequency of adjusting said local oscillation signal according to said frequency deviation value comprises:
According to said frequency deviation value adjustment crystal oscillator voltage, thereby adjustment is by the frequency of the clock reference signal of said crystal oscillator generation;
Generate said new local oscillation signal according to adjusted said clock reference signal.
3. method according to claim 1 is characterized in that, saidly also comprises before adjusting the frequency of said local oscillation signal according to said frequency deviation value:
Judge whether said Wireless Telecom Equipment surpasses the pre-set velocity threshold value with respect to the translational speed of said macro base station;
Have only when said translational speed surpasses said pre-set velocity threshold value, just adjust the frequency of said local oscillation signal according to said frequency deviation value.
4. a Wireless Telecom Equipment is characterized in that, comprising:
Frequency synthesizer is used to generate local oscillation signal;
The treatment channel module is used for the said local oscillation signal based on the frequency synthesizer generation, the radiofrequency signal that comes from macro base station is carried out down-converted generate intermediate-freuqncy signal;
Computing module is used for the frequency deviation value of the said intermediate-freuqncy signal of computing channel module generation with respect to theoretical IF-FRE;
The frequency deviation adjusting module; Be used for said frequency deviation value according to the computing module generation; The frequency of the said local oscillation signal that the synthesizer of adjusting frequency generates makes the absolute value of receiving the new frequency deviation value that is calculated by computing module after another radiofrequency signal that comes from said macro base station once more less than preset frequency deviation threshold value.
5. Wireless Telecom Equipment according to claim 4 is characterized in that, also comprises:
The speed judge module is used to judge whether said Wireless Telecom Equipment surpasses the pre-set velocity threshold value with respect to the translational speed of said macro base station;
Said frequency deviation adjusting module also is used to have only when the speed judge module is judged said translational speed and surpassed said pre-set velocity threshold value, the said frequency deviation value that just generates according to computing module, the frequency of the said local oscillation signal that the synthesizer of adjusting frequency generates.
6. according to claim 4 or 5 described Wireless Telecom Equipments, it is characterized in that said frequency deviation adjusting module comprises:
Crystal oscillator is used for producing the clock reference signal according to the magnitude of voltage of setting;
Voltage-adjusting unit is used for adjusting according to the said frequency deviation value that computing module generates the voltage of said crystal oscillator, from then adjusting the frequency of the clock reference signal that is produced by said crystal oscillator;
Said frequency synthesizer also is used for generating said new local oscillation signal according to the adjusted said clock reference signal of voltage-adjusting unit.
7. according to the said Wireless Telecom Equipment of claim 4, it is characterized in that said Wireless Telecom Equipment is to be used to receive said static communication equipment or the mobile signal equipment that comes from the radiofrequency signal of macro base station.
8. Wireless Telecom Equipment according to claim 7 is characterized in that: said static communication equipment is little base station or from the base station.
9. Wireless Telecom Equipment according to claim 7 is characterized in that: said mobile signal equipment is the vehicle-mounted repeater of high ferro.
10. Wireless Telecom Equipment according to claim 9 is characterized in that: said crystal oscillator is the thermostatic control crystal oscillator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102776589A CN102404839A (en) | 2010-09-08 | 2010-09-08 | Synchronous locking method and wireless telecommunication device |
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| CN2010102776589A CN102404839A (en) | 2010-09-08 | 2010-09-08 | Synchronous locking method and wireless telecommunication device |
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| CN102404839A true CN102404839A (en) | 2012-04-04 |
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| CN2010102776589A Pending CN102404839A (en) | 2010-09-08 | 2010-09-08 | Synchronous locking method and wireless telecommunication device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103004112A (en) * | 2012-09-11 | 2013-03-27 | 华为技术有限公司 | Signal frequency adjustment method and device |
| CN104135296A (en) * | 2014-07-12 | 2014-11-05 | 无锡中星微电子有限公司 | Adjustable intermediate frequency wireless receiver and Bluetooth module |
| CN108123763A (en) * | 2017-12-26 | 2018-06-05 | 中国铁路信息技术中心 | Frequency difference compensation method and device |
| CN111726133A (en) * | 2020-05-15 | 2020-09-29 | 北京万集科技股份有限公司 | Radio frequency signal processing method and device, storage medium and electronic device |
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| CN1549622A (en) * | 2003-05-23 | 2004-11-24 | 乐金电子（中国）研究开发中心有限公 | Method and apparatus for carrier deviation estimation in mobile communication system |
| CN101567705A (en) * | 2009-03-31 | 2009-10-28 | 中兴通讯股份有限公司 | Mobile terminal and uplink channel local frequency regulation method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1549622A (en) * | 2003-05-23 | 2004-11-24 | 乐金电子（中国）研究开发中心有限公 | Method and apparatus for carrier deviation estimation in mobile communication system |
| CN101567705A (en) * | 2009-03-31 | 2009-10-28 | 中兴通讯股份有限公司 | Mobile terminal and uplink channel local frequency regulation method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103004112A (en) * | 2012-09-11 | 2013-03-27 | 华为技术有限公司 | Signal frequency adjustment method and device |
| WO2014040216A1 (en) * | 2012-09-11 | 2014-03-20 | 华为技术有限公司 | Method and device for adjusting signal frequency |
| CN103004112B (en) * | 2012-09-11 | 2016-05-25 | 华为技术有限公司 | A kind of control method of signal frequency and device |
| CN104135296A (en) * | 2014-07-12 | 2014-11-05 | 无锡中星微电子有限公司 | Adjustable intermediate frequency wireless receiver and Bluetooth module |
| CN104135296B (en) * | 2014-07-12 | 2017-03-15 | 无锡中星微电子有限公司 | Adjustable mean frequency wireless receiver and bluetooth module |
| CN108123763A (en) * | 2017-12-26 | 2018-06-05 | 中国铁路信息技术中心 | Frequency difference compensation method and device |
| CN111726133A (en) * | 2020-05-15 | 2020-09-29 | 北京万集科技股份有限公司 | Radio frequency signal processing method and device, storage medium and electronic device |
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Application publication date: 20120404 |