CN102447479A - Automatic frequency-selecting technology applied to GSM digital repeater - Google Patents
Automatic frequency-selecting technology applied to GSM digital repeater Download PDFInfo
- Publication number
- CN102447479A CN102447479A CN2011103747906A CN201110374790A CN102447479A CN 102447479 A CN102447479 A CN 102447479A CN 2011103747906 A CN2011103747906 A CN 2011103747906A CN 201110374790 A CN201110374790 A CN 201110374790A CN 102447479 A CN102447479 A CN 102447479A
- Authority
- CN
- China
- Prior art keywords
- frequency
- digital
- select
- gsm
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention relates to an automatic frequency-selecting technology applied to GSM digital repeater by software radio framework, down-converting and sampling GSM signal of radio frequency into a digital base band signal, designing two DDC channels in FPGA (Field Programmable Gate Array) chip, one channel being automatic frequency-selecting mode channel, traversing all frequency points in this DDC channel, calculating power of each frequency point, getting rid of the working frequency point close to noise, arranging carrier frequency points of an alternative set according to the power level, at last by automatic frequency-selecting algorithm, screening new repeater equipment working frequency point. The invention not only can make the digital optical fiber repeater automatically track and adapt to frequency adjustment and change of a message source station, but also can be an excellent reference for other repeaters to realize automatic frequency-selecting function.
Description
Technical field
The present invention relates to wireless communication technology field, be applied to GSM digital high-frequency amplification station equipment, utilize this technology can realize that repeater equipment changes from the frequency adjustment that motion tracking adapts to the information source base station.
Background technology
Use in the mobile network in a large number the repeater at present; Early stage broad band repeater is owing to be that the radiofrequency signal in the whole frequency band is all amplified; Disturbing very greatly, seldom use now, all is frequency selecting repeater in the high-power repeater of network operation; Only amplify the CF signal of donor base station; But because the network optimization, donor base station needs often change working frequency points, thus the installation of frequency selecting repeater open with later maintenance in most important work be exactly the working frequency points that the repeater is set.
But traditional mode that the repeater working frequency points is set has a lot of deficiencies; It at present all is the working frequency points that adopts the monitor supervision platform change repeater of repeater; The engineering staff need know the working frequency points after the change, sends the working frequency points that the change order changes the repeater through monitor supervision platform.But this mode has two problems in actual engineering is used, one be equipment often monitoring less than, uncontrollable repeater equipment.All possibly cause the MODEM can't operate as normal because temporary interruption, MODEM (modulator-demodulator) hardware fault, equipment are installed congested or the like the reason of the mobile network on ground, background monitoring also just can't monitor equipment; The another one problem be this monitor mode need every repeater all be equipped with one open logical SMS SIM (Subscriber Identity Module) card, Virtual network operator need regularly be supplemented with money for SIM, arrearage just can't be used; Many local network operation commercial cities do not want to take the trouble; Later stage does not supplement with money, causes all arrearages of a lot of SIMs, can't normally use; Certainly also just can not realize through the monitor supervision platform remote supervisory and control(ling) equipment, so all restrictions are still arranged in actual use.
Select frequency automatically technology through the GSM digital high-frequency amplification station can change this situation, and the equipment that is very easy to the repeater is opened and engineering maintenance.After the sector working frequency points had been changed in the optimization of information source base station network, the automatic search work frequency of repeater equipment meeting, and locking did not again need the backstage control of monitor supervision platform, more do not need the engineering staff to arrive field modification.
Summary of the invention
The objective of the invention is to realize the select frequency automatically of GSM digital high-frequency amplification station, make things convenient for the equipment of repeater to open and the later stage engineering maintenance.
The present invention adopts following scheme to realize: a kind of select frequency automatically technology of the GSM of being applied to digital high-frequency amplification station; It is characterized in that: adopt the software radio framework; After the GSM radiofrequency signal down-conversion sample conversion of reception antenna input become digital baseband signal; Get into the two-way Digital Down Convert DDC passage of realizing through the FPGA hardware programming simultaneously, wherein one the tunnel is select frequency automatically pattern passage, and other one the tunnel is the normal mode of operation passage; Design digital frequency-selector and mean effective power measurement module in said select frequency automatically pattern passage; The digital baseband signal of input is carried out the single carrier power measurement; According to the GSM standard; Calculate the digital power signal in the reframing time scope, reject working frequency points, arrange alternative collection working frequency points according to watt level near noise; According to the select frequency automatically algorithm, frequency is divided into three priority, preceding 12 working frequency points of limit priority are updated to current collection, the DDC passage that when the next update cycle arrives, offers normal mode of operation uses, and accomplishes the select frequency automatically process.
The present invention can be used for not only realizing that digital optical fiber direct station changes from the frequency adjustment that motion tracking adapts to the information source base station, also can be used as the good reference that the select frequency automatically function is realized in other repeaters.
Description of drawings
Fig. 1 is the separate design block diagram of the DDC passage in the embodiment of the invention.
Fig. 2 is the DDC project organization of the select frequency automatically function in the embodiment of the invention.
Fig. 3 is the frame structure of the GSM in the embodiment of the invention.
Fig. 4 is the power measurement integrator design structure chart in the embodiment of the invention.
Fig. 5 is the power measurement integrator timing relationship figure in the embodiment of the invention.
Fig. 6 is the select frequency automatically algorithm routine block diagram in the embodiment of the invention.
Embodiment
Realize the select frequency automatically technology of GSM digital high-frequency amplification station among the present invention; Adopt the software radio framework; After the GSM radiofrequency signal down-conversion sample conversion of reception antenna input become digital baseband signal; Get into the two-way Digital Down Convert DDC passage of realizing through the FPGA hardware programming simultaneously, wherein one the tunnel is select frequency automatically pattern passage, and other one the tunnel is the normal mode of operation passage; Design digital frequency-selector and mean effective power measurement module in said select frequency automatically pattern passage; The digital baseband signal of input is carried out the single carrier power measurement; According to the GSM standard; Calculate the digital power signal in the reframing time scope, reject working frequency points, arrange alternative collection working frequency points according to watt level near noise; According to the select frequency automatically algorithm, frequency is divided into three priority, preceding 12 working frequency points of limit priority are updated to current collection, the DDC passage that when the next update cycle arrives, offers normal mode of operation uses, and accomplishes the select frequency automatically process.
In order to let those skilled in the art better understand the present invention, main module is further specified below in conjunction with accompanying drawing.
Select frequency automatically technology of the present invention mainly comprises following module:
One, the global design of DDC module
Designed a kind of descending DDC module, it comprises two kinds of DDC passages, and wherein a kind of is select frequency automatically pattern DDC passage, establishes 6 the tunnel altogether; In addition a kind of then is repeater normal mode of operation DDC passage, establishes 12 the tunnel altogether, and be as shown in Figure 1.
The signal of normal mode of operation DDC passage is exported to electrooptic conversion module after overfrequency is selected, through the packing of CPRI (common public radio interface) protocol data, send to the repeater far-end unit by optical fiber; The DDC functional module of this pattern only realizes the frequency-selecting function, and the multiple carrier digital signal that is about to input separates into independently single-carrier signal;
The DDC passage of select frequency automatically pattern has gone out outside the frequency-selecting function, has also increased the design of real-time measurement carrier power, through measuring the carrier wave of effective power, for the select frequency automatically algorithm provides the data input.
The indoor design scheme of the DDC passage of select frequency automatically pattern is as shown in Figure 2, the NCO (digital controlled oscillator) that the DDC module works alone for each DDC channel arrangement, digital filter, RMS (root mean square) power measurement functional module.Wherein NCO is used to select the operating frequency of input carrier signal, and the carrier signal that only meets frequency could get into this DDC channel interior.The signal processing of this DDC module is: the digital signal sequences after the AD sampling is multiplied each other with the digital carrier signal that the two-way of NCO output differs 90 degree respectively; The I of this two-way, Q signal; Send into CIC (accumulation comb filter) and CFIR (compensating filter) filter carries out the two-stage extraction through postponing adjustment with interior inserting; Carry out pulse shaping through PFIR (programmable filter) again; Data signal rate behind the reduction of speed is the twice of GSM data rate, and promptly 270.833 * 2=541.666kbps inputs to RMS Power Measure module then and carries out power samples and measurement.
Two, mean effective power measurement module
Realize the GSM carrier signal is carried out effective power measurement, at first need understand the characteristic of GSM signal.The GSM carrier wave is pressed the 4.6125ms frame and is transmitted information, and every frame is divided into 8 time slots, and is as shown in Figure 3:
Effective measurement unit of carrier power is a physical channel, i.e. time slot.Depend on whether the logic channel corresponding with it is transmitting information because whether physical channel power exists, so be not can detect power in any time slot.The GSM logic channel can be divided into control channel and Traffic Channel.BCCH in the control channel and synchronizing channel, the operating time is continual, other control channels are intermittently useds; Traffic Channel is used to carry voice or user data, only when having the cellphone subscriber to use, just works.In actual GSM network, configurable several carrier frequency of base station section C0, C1 ... Cn, BCCH channel of broadcast control and synchronous channel SCH are mapped on first time slot TS0 of main carrier C0 usually; Other time slots of C0 and all time slots of other carrier waves are used for Traffic Channel and other control channels.In this case, have only the TSO of main carrier C0 to test at any time has the base station power emission always, and any time slot of the TS1-TS7 time slot of C0 and other carrier waves all only just has the base station power emission when having the cellphone subscriber to take.Therefore, C0 can accomplish power samples through the TS0 of any frame, can judge whether it is effective carrier wave, and other carrier waves then can't be accomplished.
So; Can other carrier waves be found effective time slot power of all the other carrier waves through power samples how long? According to the gsm protocol standard; TCH (Traffic Channel) and FACCH (forward direction access control channel) etc. are mapped to the multi-frame (120ms) of 26 frames; That is to say as long as there is communication process in this carrier wave, in each multi-frame, have at least a time slot to activate.Therefore I is designed to 120ms the cycle of power detection analysis, in order to improve accuracy, and can a check and analysis N cycle.
The operation principle of digital high-frequency amplification station can know that the ADC module carries out quick sampling to each carrier wave on continuous time, can guarantee the undistorted transmission of signal.Therefore guarantee that for the double sampling of carrying out for detection power among the DDC needs only each time slot can both collect at least 1 data, just be greater than 1/0.577ms=1.733KHz.Here recommending the design sampling clock is 26KHz; Be 15 data of each time slot sampling; The data of sampling 3.12K in 120 data of the frame sampling of a TDMA, the multi-frame of one 26 frame can guarantee that so promptly precision can be avoided again FPGA is proposed too high performance requirement preferably.
Design such as Fig. 4, shown in Figure 5 that RMS Power Measure power measurement calculates: the IQ signal of PFIR filter output through the data on the I road of exporting after the double sampling and Q road constantly by square; Data after adding up are sent in the digital integrator at each rising edge clock; Digital integrator constantly carries out accumulating operation to the data of input; This digital integrator is controlled by the integration interval counter again, and the integration interval rolling counters forward arrives when presetting threshold values can zero setting restart counting then, when zero setting, exports clear (zero clearing) signal simultaneously; Empty the numerical value in the digital integrator, let digital integrator restart integral operation.The integral number of times counter then is responsible for behind the integral number of times that arrival is preset, sending enable (enabling) signal and interrupt signal, and the numerical value of this digital integrator is just exported from register, and interrupt signal then points out monitoring center module to receive the data in this moment.
The carrier power value of register output is:
Power=
n is an integral number of times, can carry out value according to the precision needs
Three, select frequency automatically algorithm
The DDC passage that is used for the select frequency automatically pattern starts beginning from repeater equipment and just follows the tracks of each carrier power of gathering the repeater input; And the result reported monitoring center module; Send normal mode of operation DDC passage after the select frequency automatically algorithm computation by monitoring center module to and use.
The program circuit of realizing the select frequency automatically algorithm is as shown in Figure 6:
If each frequency comprises 3 element: frequency point number n, power P and power significant notation m, note is done:
To move the EGSM system is example, has 120 optional frequencies, and the frequency set is:
P wherein
nBe the performance number of frequency n, P0 is the interference noise power value.
Then; The power significant notation is 1 frequency points M in can obtaining gathering,
Can from the C set, select maximum k successively, as recommending frequency set F by performance number
1:
If the former frequency set F that work has been set
i, the frequency sets F that selects so at last
2Form by two parts:
The preferential F that selects
1Secondly all frequencies are F
0Remove in the set and F
1The part of occuring simultaneously
Below promptly accomplished one and taken turns the automatic selection of frequency, if do not receive that switching to artificial frequency-selecting mode instruction then gets into the next round select frequency automatically, the variation of the continuous monitoring frequency that so circulates once more.
More than be preferred embodiment of the present invention, all changes of doing according to technical scheme of the present invention when the function that is produced does not exceed the scope of technical scheme of the present invention, all belong to protection scope of the present invention.
Claims (3)
1. a select frequency automatically that is applied to the GSM digital high-frequency amplification station is technological; It is characterized in that: adopt the software radio framework; After the GSM radiofrequency signal down-conversion sample conversion of reception antenna input become digital baseband signal; Get into the two-way Digital Down Convert DDC passage of realizing through the FPGA hardware programming simultaneously, wherein one the tunnel is select frequency automatically pattern passage, and other one the tunnel is the normal mode of operation passage; Design digital frequency-selector and mean effective power measurement module in said select frequency automatically pattern passage; The digital baseband signal of input is carried out the single carrier power measurement; According to the GSM standard; Calculate the digital power signal in the reframing time scope, reject working frequency points, arrange alternative collection working frequency points according to watt level near noise; According to the select frequency automatically algorithm, frequency is divided into three priority, preceding 12 working frequency points of limit priority are updated to current collection, the DDC passage that when the next update cycle arrives, offers normal mode of operation uses, and accomplishes the select frequency automatically process.
2. the select frequency automatically technology that is applied to the GSM digital high-frequency amplification station according to claim 1, it is characterized in that: described select frequency automatically pattern passage comprises digital controlled oscillator NCO, digital filter, RMS mean effective power measurement function module; The process of its signal processing is: after the digital carrier signal that described digital baseband signal is differed 90 degree with the two-way of digital controlled oscillator NCO output respectively multiplies each other; Send into CIC and the CFIR filter carries out the two-stage extraction through postponing adjustment with interior inserting; Carry out pulse shaping through PFIR again, input to RMS mean effective power measurement module then and carry out power samples and measurement.
3. the select frequency automatically technology that is applied to the GSM digital high-frequency amplification station according to claim 1, it is characterized in that: described select frequency automatically algorithm is realized by following mode: establish each frequency and comprise 3 element: frequency point number n, power P and power significant notation m, note is done:
To move the EGSM system is example, has 120 optional frequencies, and the frequency set is:
P wherein
nBe the performance number of frequency n, P0 is the interference noise power value;
Then; The power significant notation is 1 frequency points M in obtaining gathering,
From the C set, select maximum k successively, as recommending frequency set F by performance number
1:
If the former frequency set F that work has been set
i, the frequency sets F that selects so at last
2Form by two parts:
The preferential F that selects
1Secondly all frequencies are F
0Remove in the set and F
1The part of occuring simultaneously
Below promptly accomplished one and taken turns the automatic selection of frequency, if do not receive that switching to artificial frequency-selecting mode instruction then gets into the next round select frequency automatically, the variation of the continuous monitoring frequency that so circulates once more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103747906A CN102447479A (en) | 2011-11-22 | 2011-11-22 | Automatic frequency-selecting technology applied to GSM digital repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103747906A CN102447479A (en) | 2011-11-22 | 2011-11-22 | Automatic frequency-selecting technology applied to GSM digital repeater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102447479A true CN102447479A (en) | 2012-05-09 |
Family
ID=46009616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103747906A Pending CN102447479A (en) | 2011-11-22 | 2011-11-22 | Automatic frequency-selecting technology applied to GSM digital repeater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102447479A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124244A (en) * | 2012-09-04 | 2013-05-29 | 中国电子科技集团公司第五十四研究所 | Method for cognizing active channel and selecting communication frequency in point-to-multipoint system |
| CN108155939A (en) * | 2017-12-19 | 2018-06-12 | 南京典格通信科技有限公司 | Power testing method in a kind of GSM_R digital optical fiber direct stations |
| CN110392437A (en) * | 2019-07-29 | 2019-10-29 | 上海载德信息科技有限公司 | A kind of switching method, device, terminal and the storage medium of terminal works frequency point |
| CN110690909A (en) * | 2019-10-12 | 2020-01-14 | 湖南智领通信科技有限公司 | Low-complexity dynamic non-uniform channelized user separation method |
| CN111162851A (en) * | 2019-12-23 | 2020-05-15 | 京信通信系统（中国）有限公司 | Method and device for frequency band matching of repeater |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101635575A (en) * | 2009-08-26 | 2010-01-27 | 成都林海电子有限责任公司 | Four-channel shortwave digital signal processing platform based on software radio |
| JP2010141604A (en) * | 2008-12-11 | 2010-06-24 | Hitachi Kokusai Electric Inc | Wireless device |
| CN201976105U (en) * | 2010-11-03 | 2011-09-14 | 三维通信股份有限公司 | Digital frequency-selecting repeater with in-band fluctuation compensation |
-
2011
- 2011-11-22 CN CN2011103747906A patent/CN102447479A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010141604A (en) * | 2008-12-11 | 2010-06-24 | Hitachi Kokusai Electric Inc | Wireless device |
| CN101635575A (en) * | 2009-08-26 | 2010-01-27 | 成都林海电子有限责任公司 | Four-channel shortwave digital signal processing platform based on software radio |
| CN201976105U (en) * | 2010-11-03 | 2011-09-14 | 三维通信股份有限公司 | Digital frequency-selecting repeater with in-band fluctuation compensation |
Non-Patent Citations (1)
| Title |
|---|
| 赖克中: "GSM数字光纤直放站的自动选频技术研究", 《移动通信》, no. 24, 23 December 2009 (2009-12-23), pages 33 - 37 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124244A (en) * | 2012-09-04 | 2013-05-29 | 中国电子科技集团公司第五十四研究所 | Method for cognizing active channel and selecting communication frequency in point-to-multipoint system |
| CN103124244B (en) * | 2012-09-04 | 2015-11-25 | 中国电子科技集团公司第五十四研究所 | Active channel cognition in a kind of point-to-multipoint system and communication frequency system of selection |
| CN108155939A (en) * | 2017-12-19 | 2018-06-12 | 南京典格通信科技有限公司 | Power testing method in a kind of GSM_R digital optical fiber direct stations |
| CN110392437A (en) * | 2019-07-29 | 2019-10-29 | 上海载德信息科技有限公司 | A kind of switching method, device, terminal and the storage medium of terminal works frequency point |
| CN110690909A (en) * | 2019-10-12 | 2020-01-14 | 湖南智领通信科技有限公司 | Low-complexity dynamic non-uniform channelized user separation method |
| CN110690909B (en) * | 2019-10-12 | 2022-04-05 | 湖南智领通信科技有限公司 | Low-complexity dynamic non-uniform channelized user separation method |
| CN111162851A (en) * | 2019-12-23 | 2020-05-15 | 京信通信系统（中国）有限公司 | Method and device for frequency band matching of repeater |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| USRE49749E1 (en) | Optimized telecommunications distribution system | |
| CN101938827B (en) | TD-SCDMA format Femtocell air interface synchronization method | |
| CN102447479A (en) | Automatic frequency-selecting technology applied to GSM digital repeater | |
| CN102377495B (en) | Radio frequency detection method, Apparatus and system | |
| CN103379674A (en) | Multimode digital DAS supporting multi-information-source access | |
| US8472578B2 (en) | Radio apparatus, radio apparatus controller, and synchronization establishing method | |
| CN109618412B (en) | Novel 5G-oriented digital optical fiber distribution system and method for carrying out capacity scheduling on downlink and uplink by using same | |
| CN201805426U (en) | Autosynchronous SCDMA optic-fiber repeater equipment | |
| CN1996788B (en) | Configuration device and adjusting method of the time slot of the wireless network direct station based on the satellite synchronization | |
| CN201717856U (en) | GSM digital wireless repeater capable of automatically setting carrier frequency | |
| CN101471716B (en) | Method for searching base station carrier frequency point of GSM directly-amplifying station | |
| CN203387690U (en) | Multi-mode digital DAS supporting multi-source access | |
| CN1913393B (en) | Method and device for implementing whole-network base station synchronous of time division duplex system | |
| CN102892139B (en) | Method for measuring neighbourhood of multi-channel wireless communication system | |
| CN102625327B (en) | Digital intermediate frequency optical fiber repeater frequency automatic tracking method | |
| CN210469311U (en) | Wireless repeater with self-adaptive multi-carrier, multi-frequency selection and multi-band selection | |
| CN204836168U (en) | Miniature relay system of multimode multifrequency communications network | |
| CN201479134U (en) | GSM wireless repeater station with ascending noise inhibition function | |
| CN204465890U (en) | The access device of multi-service compartment system | |
| CN114401521A (en) | Variable frequency communication transmission method and transmission system | |
| CN102325389A (en) | GSM micropower repeater of automatic locking base station BCCH (Broadcast Control Channel) | |
| CN204993345U (en) | Miniature high performance TD -LTE relay system | |
| CN202231874U (en) | GSM micropower repeater capable of automatically locking base station BCCH | |
| CN220108216U (en) | 5G signal indoor coverage system based on frequency conversion technology | |
| CN101640950A (en) | Variable band width frequency-shift and frequency-selective digital repeater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 350005 Cangshan science and Technology Park, Fujian District, Fuzhou, No. 6, No. 1 Applicant after: China Youke Communication Technology Co., Ltd. Address before: 350005 Cangshan science and Technology Park, Fujian District, Fuzhou, No. 6, No. 1 Applicant before: Fujian Youke Communication Technology Co., Ltd. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: FUJIAN YOUKE COMMUNICATION TECHNOLOGY CO., LTD. TO: CHINA YOUKE COMMUNICATION TECHNOLOGY CO., LTD. |
|
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120509 |