CN201976105U - Digital frequency-selecting repeater with in-band fluctuation compensation - Google Patents
Digital frequency-selecting repeater with in-band fluctuation compensation Download PDFInfo
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- CN201976105U CN201976105U CN2010205992034U CN201020599203U CN201976105U CN 201976105 U CN201976105 U CN 201976105U CN 2010205992034 U CN2010205992034 U CN 2010205992034U CN 201020599203 U CN201020599203 U CN 201020599203U CN 201976105 U CN201976105 U CN 201976105U
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Abstract
The utility model discloses a digital frequency-selecting repeater with in-band fluctuation compensation, which comprises a near-end device and a far-end device. A power control module used for adjusting output power of each carrier is arranged in front of an interpolation device, a filtration device and a frequency mixing device of a digital upper variable frequency module; and an ARM (automated route management) program module of a digital board used for calculating the compensation value of the power of the carrier is used for adjusting the signal power of each carrier through an I2C (Inter-Integrated Circuit) bus. The utility model has the beneficial effects that: a digital signal processing technology is adopted to compensate for in-band fluctuation of a digital repeater system, the in-band fluctuation of the digital frequency-selecting repeater is equivalent to differences in the output power of each carrier within the working frequency range of the system and is balanced through adjusting the power of each carrier, the method is simple and practicable, a very ideal effect can be achieved through the method, and the design difficulty in technical requirements for 3dB or less in-band fluctuation in the working frequency band of the digital repeater system is greatly reduced.
Description
Technical field
The utility model relates to mobile communications network and covers and the optimization field, mainly is a kind of digital frequency-selecting repeater of passband fluctuation compensation.
Background technology
Along with the fast development of mobile communication business, the repeater is as the visual plant that improves district, blind area a little less than the mobile network signal, is widely used in mobile radio communication with less, simple in structure, the easy for installation advantage such as flexible of its investment.Following mobile communication system exists problems such as multifrequency, multimode, many systems and many standards, and this has just limited the intercommunication and the compatibility of various device, and therefore the application in the repeater has proposed practical demand to software and radio technique.In order to improve the cost performance of repeater, the hardware platform that adopts digital technology to unify the repeater is a kind of solution preferably.
Digital optical fiber direct station is a kind of base station radio frequency remoter equipment, and it is made up of a near-end unit and Duo Tai remote termination, utilizes digital caching technology and digital light transmission technology to realize that the networking of a plurality of far-end units covers continuously; Use digital filtering and power trigger technology to realize the decrease of noise functions of up-downgoing carrier wave simultaneously, solved the noise jamming problem of simulation repeater preferably.The digital fiber system down link: the near-end unit is by radio frequency interface coupling base station section signal, after duplexer, simulation frequency conversion, analog-to-digital conversion (ADC), Digital Down Convert (DDC), carry out the electric light conversion, digital optical signal arrives far-end unit by Optical Fiber Transmission, far-end unit is gone into the radio frequency power amplifier through opto-electronic conversion, Digital Up Convert (DUC), digital-to-analogue conversion (DAC), simulation frequency conversion are laggard, and last high-power RF signal is delivered to antenna-feedback system.Digital light wire system up link: comprise main collection and receive and two passages of diversity reception, adopt and descending same processing procedure.
The hardware platform of digital high-frequency amplification station comprises several sections such as duplexer, small-signal plate, digiboard, power amplifier, monitor board, power module.The repeater specification requirement: the difference of maximum level and minimum levels is passband fluctuation≤3dB (peak-to-peak value) in the direct discharging station operating frequency range.The passband fluctuation of system is mainly by system signal link simulation part, unevenness such as frequency response in the band of duplexer, Surface Acoustic Wave Filter etc. causes, if whole system design is not imperfect words of selecting for use the coupling of device with better passband fluctuation or filter to do, be difficult to satisfy the requirement of direct discharging station passband fluctuation≤3dB.
The utility model content
The purpose of this utility model will overcome the deficiency of above-mentioned technology just, and the digital frequency-selecting repeater that provides a kind of passband fluctuation to compensate, particularly a kind of digital direct discharging station that adopts the software radio framework comprises digital optical fibre frequency-selecting repeater, digital radio frequency selecting repeater or the like.
The utility model solves the technical scheme that its technical problem adopts: the power that the utility model adopts digital frequency-selecting to adjust every carrier wave afterwards comes the passband fluctuation of bucking-out system.We also can be understood as such as the passband fluctuation of GSM digital frequency-selection system: the difference of the carrier output power of every carrier wave in the system works frequency range.Need only the power of accomplishing to adjust each carrier wave at numeric field, make every carrier wave under the identical situation of input power, the difference≤3dB of power output just is equivalent to satisfy the requirement of the passband fluctuation≤3dB of system.
The digital frequency-selecting repeater of this passband fluctuation compensation described in the utility model, include proximal device and remote equipment, in number in the frequency-variable module, be provided with a power control module that is used for adjusting the power output of each carrier wave in number before the interpolation of frequency conversion, filtering, the mixing; The ARM program module of digiboard that is used for calculating the offset of carrier power is adjusted the signal power of every carrier wave by the I2C bus.
The compensation method of the digital frequency-selecting repeater of passband fluctuation compensation described in the utility model, adjust the signal power of every carrier wave by the power control module in the Digital Up Convert module, calculate the offset of carrier power by the ARM program module of digiboard, adjust the signal power of every carrier wave then by the I2C bus, the power of regulating each carrier wave is offset the passband fluctuation of direct discharging station.
Concrete steps are as follows:
1), adjust the power output of each carrier wave by Digital Up Convert modular power control module, the power control value of every carrier wave calculates the back by the ARM program module of digiboard and disposes by I2C (Inter-Integrated Circuit) bus; System's each carrier wave after digital frequency-selecting needs independent power control module.If the DDC of system, DUC are the special chips that adopt, the power of the every carrier wave of so this special chip generally can be controlled separately.If the DDC of system, DUC design with FPGA, so in design DUC, the IQ baseband complex signal of every carrier wave (complex signal X=I+Q*j can be regarded as the synthetic of a real signal I and an empty signal Q) at first with a power control value channel_power_control multiply each other be used for coarse adjustment, finely tune the power of every carrier wave.
2), do not having under the situation of passband fluctuation compensation, the peak value of the passband fluctuation of system works frequency range build-in test gained according to fluctuation, the valley broken line changes into three sections straight lines and is similar to.We can obtain the starting point of every section straight line, the frequency and the power of terminal point, and the slope of calculating every section straight line.The approximate purpose of straight line is for according to the starting point of straight line, the frequency and the power of terminal point, and the slope of straight line comes in the computing system working frequency range approx every amplitude response.
3), according to the channel number of system configuration, the ARM program module of digiboard is calculated the frequency of carrier wave, just can know current carrier wave within which section broken line, can calculate the value that each carrier power needs is adjusted according to the slope of broken line, the starting point frequency of broken line and the frequency of power and carrier wave then.
Every carrier power controlling value when 4), adjusting Digital Up Convert (DUC) according to the offset of the power of each carrier wave of calculating is previously come the passband fluctuation of bucking-out system;
5) all be to calculate and dispose every carrier power controlling value channel_power_control, by the I2C bus by the ARM program module of digiboard about the power control value of the slope of broken line, carrier wave, the power output that reaches each frequency of system under the identical situation of the input signal power of each frequency is also identical, to reduce the passband fluctuation of frequency-selective system.
The effect that the utility model is useful is: adopt digital technology to come the bigger passband fluctuation of bucking-out system analogue device, implement very simple and efficient, reduced the design difficulty of this piece of direct discharging station passband fluctuation greatly, had great reference and realistic meaning for the technical barrier that solves similar design existence.
Description of drawings
Fig. 1 is the digital optical fiber repeater system schematic diagram;
Fig. 2 is the realization block diagram of Digital Up Convert of the present utility model (DUC);
Fig. 3 is the broken line approximate diagram of the passband fluctuation of the utility model frequency selecting repeater;
Fig. 4 is the passband fluctuation compensation schematic diagram of the utility model frequency selecting repeater.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
Fig. 1 is the digital optical fiber repeater system schematic diagram.This system includes proximal device and remote equipment, system down link: the near-end unit is by radio frequency interface coupling base station section signal, after duplexer, simulation frequency conversion, analog-to-digital conversion (ADC), Digital Down Convert (DDC), carry out the electric light conversion, digital optical signal arrives far-end unit by Optical Fiber Transmission, far-end unit is gone into the radio frequency power amplifier through opto-electronic conversion, Digital Up Convert (DUC), digital-to-analogue conversion (DAC), simulation frequency conversion are laggard, and last high-power RF signal is delivered to antenna-feedback system.Digital fiber system up-link: comprise main collection and receive and two passages of diversity reception, adopt and descending same processing procedure.
Fig. 2 is the realization block diagram of Digital Up Convert of the present utility model (DUC), can see that we have added a power control module before the interpolation, filtering, mixing of frequency conversion in number, the effect of this module is exactly the power output that is used for adjusting each carrier wave, for the compensation of the passband fluctuation of back is prepared.The implementation method of power control module be exactly after with multiplier the IQ baseband complex signal of every carrier wave (complex signal X=I+Q*j can be regarded as the synthetic of a real signal I and an empty signal Q) signal being multiplied each other with the power control value of every carrier wave respectively signal through cut position, round up, and then do Digital Up Convert (DUC).
Fig. 3 is the broken line approximate diagram of the passband fluctuation of the utility model GSM frequency selecting repeater.Concrete performing step is as follows:
At first test the passband fluctuation of frequency selecting repeater system under the situation that does not have the passband fluctuation compensation.Center frequency point such as the downstream signal of GSM frequency selecting repeater system is 942M, and bandwidth is 24M.Under the situation that does not enable the passband fluctuation compensation, the frequency that the work of every carrier wave is set is evenly distributed in the working frequency range of system, the input system frequency is that 930M is to the sinusoidal wave swept-frequency signal of 954M then, frequency spectrograph is received in output, and (center frequency point of frequency spectrograph is set to 942M, bandwidth is set to 30M), we just can obtain the system's passband fluctuation in the GSM frequency selecting repeater downstream signal working frequency range, as shown in Figure 3.
Then the peak value of the passband fluctuation of system works frequency range build-in test gained according to fluctuation, the valley broken line changes into three sections straight lines (as straight line A, straight line B, the straight line C of Fig. 3) and comes approximate, these three sections straight lines just have four breakover points (some a, some b, some c, some d), we can read the frequency and the amplitude response of these four points on frequency spectrograph, according to the frequency of four breakover points of three sections straight lines and amplitude response, just can the calculation system working frequency range in every amplitude response.This frequency of 4 and these four parameters of amplitude are passed through the ARM that host computer OMT software arrangements is given digiboard, ARM just can calculate the slope of every section straight line, and (to be 930M, power such as the frequency of the starting point a of straight line A be-3.5dbm, the frequency of the terminal point b of straight line A is that 937M, power are 0dbm, the slope of straight line A is 3.5/ (937-930)=0.5 so, frequency as the carrier wave among Fig. 33 is 933.5M, and the power of carrier wave 3 needs compensation is 0.5* (933.5-930)=1.75dbm) so.
ARM is according to the channel number of system configuration, can know the frequency of carrier wave work, just know each carrier wave within which section broken line, then the offset that can calculate each carrier power according to the frequency of the starting point frequency of the slope of broken line, broken line and power and carrier wave.ARM compensates passband fluctuation to the offset that the calculates carrier power controlling value by I2C bus configuration Digital Up Convert (DUC) module then.
Fig. 4 is the passband fluctuation compensation schematic diagram of the utility model frequency selecting repeater, can be controlled within the 1.5db through the system's passband fluctuation after the adjustment carrier power.
The utility model adopts Digital Signal Processing to come the passband fluctuation of compensating digits direct discharging station.We are the equivalence of the passband fluctuation of digital frequency-selecting repeater the difference of the carrier output power of every carrier wave in the system works frequency range, adopt the power of regulating each carrier wave to offset the passband fluctuation of direct discharging station, employing this method is simple and can reach very desirable effect, greatly reduces the design difficulty of passband fluctuation in the digital direct discharging station working band≤3dB specification requirement.
All employings are equal to the method for the numeric field bucking-out system passband fluctuation of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.
Claims (1)
1. the digital frequency-selecting repeater of passband fluctuation compensation, include proximal device and remote equipment, it is characterized in that: in number in the frequency-variable module, be provided with a power control module that is used for adjusting the power output of each carrier wave in number before the interpolation of frequency conversion, filtering, the mixing.
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| CN2010205992034U CN201976105U (en) | 2010-11-03 | 2010-11-03 | Digital frequency-selecting repeater with in-band fluctuation compensation |
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| CN2010205992034U CN201976105U (en) | 2010-11-03 | 2010-11-03 | Digital frequency-selecting repeater with in-band fluctuation compensation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447479A (en) * | 2011-11-22 | 2012-05-09 | 福建邮科通信技术有限公司 | Automatic frequency-selecting technology applied to GSM digital repeater |
| CN103716096A (en) * | 2012-09-29 | 2014-04-09 | 京信通信系统（中国）有限公司 | Repeater station carrier fluctuation calibration method and device |
| CN106850474A (en) * | 2017-01-22 | 2017-06-13 | 京信通信技术(广州)有限公司 | Ultra wide band self adaptation oscillation compensation method and system |
| CN111082884A (en) * | 2019-12-16 | 2020-04-28 | 京信通信系统（中国）有限公司 | Broadband fluctuation calibration method and device and repeater system |
-
2010
- 2010-11-03 CN CN2010205992034U patent/CN201976105U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447479A (en) * | 2011-11-22 | 2012-05-09 | 福建邮科通信技术有限公司 | Automatic frequency-selecting technology applied to GSM digital repeater |
| CN103716096A (en) * | 2012-09-29 | 2014-04-09 | 京信通信系统（中国）有限公司 | Repeater station carrier fluctuation calibration method and device |
| CN103716096B (en) * | 2012-09-29 | 2016-06-15 | 京信通信系统（中国）有限公司 | Repeater carrier wave fluctuation calibration steps and device |
| CN106850474A (en) * | 2017-01-22 | 2017-06-13 | 京信通信技术(广州)有限公司 | Ultra wide band self adaptation oscillation compensation method and system |
| CN106850474B (en) * | 2017-01-22 | 2019-11-08 | 京信通信系统（中国）有限公司 | The adaptive oscillation compensation method and system of ultra wide band |
| CN111082884A (en) * | 2019-12-16 | 2020-04-28 | 京信通信系统（中国）有限公司 | Broadband fluctuation calibration method and device and repeater system |
| CN111082884B (en) * | 2019-12-16 | 2022-03-04 | 京信网络系统股份有限公司 | Broadband fluctuation calibration method and device and repeater system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20161103 |
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| CF01 | Termination of patent right due to non-payment of annual fee |