CN101997592A - In-band wave motion compensation digital repeater and compensation method - Google Patents
In-band wave motion compensation digital repeater and compensation method Download PDFInfo
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- CN101997592A CN101997592A CN2010105376662A CN201010537666A CN101997592A CN 101997592 A CN101997592 A CN 101997592A CN 2010105376662 A CN2010105376662 A CN 2010105376662A CN 201010537666 A CN201010537666 A CN 201010537666A CN 101997592 A CN101997592 A CN 101997592A
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Abstract
The invention discloses an in-band wave motion compensation digital repeater and a compensation method. The in-band wave motion compensation digital repeater comprises a near-end machine and a far-end machine. At the rear of an analog-to-digital conversion module and in front of a digital down-conversion module, an in-band wave motion compensation filter of which the parameters can be configured on line is inserted, wherein the frequency response of the in-band wave motion compensation filter is opposite to the response of a system in a digital intermediate-frequency working frequency range. The in-band wave motion compensation digital repeater and the compensation method have the advantages that: an FIR filter of which the frequency response is opposite to the in-band wave motion of the system is added in the system digital intermediate frequency to compensate for the in-band wave motion of the system; the method is simple and feasible and can achieve very ideal effect; and the design difficulty required by the technology that the in-band wave motion in the working frequency band of the digital repeater system is less than or equal to 3dB is greatly reduced.
Description
Technical field
The present invention relates to mobile communications network and cover and the optimization field, mainly is a kind of passband fluctuation compensating digits repeater and compensation method.
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.
Summary of the invention
Purpose of the present invention will overcome the deficiency of above-mentioned technology just, and provide a kind of passband fluctuation compensating digits repeater and compensation method, adopt FPGA (field programmable gate array) to realize, the anti-phase FIR filter of passband fluctuation that the present invention adopts the digital medium-frequency signal after analog-to-digital conversion (ADC) to add a frequency response and system comes the passband fluctuation of bucking-out system.
The present invention solves the technical scheme that its technical problem adopts:
This passband fluctuation compensating digits of the present invention repeater, include near-end machine and remote termination, behind analog-to-digital conversion module, inserted the passband fluctuation compensating filter that a parameter can Configuration Online before Digital Down Converter Module, the frequency response of this passband fluctuation compensating filter is opposite in the response of digital intermediate frequency operating frequency range with system.
The compensation method of passband fluctuation compensating digits of the present invention repeater, step is as follows:
1), system behind analog-to-digital conversion module ADC, insert a passband fluctuation compensating filter (FIR compensating filter), the parameter Configuration Online of passband fluctuation compensating filter before in Digital Down Converter Module (DDC);
2), do not having under the situation of passband fluctuation compensation, the input of system adds sinusoidal wave swept-frequency signal, frequency spectrograph is received in system's output, obtains the frequency response of system and the passband fluctuation in the system works frequency range;
3), according to the passband fluctuation of the system of front test gained, design a passband fluctuation compensating filter, the frequency response of passband fluctuation compensating filter is opposite in the response of digital intermediate frequency operating frequency range with system;
4), the passband fluctuation compensating filter parameter that obtains according to the front design, digiboard ARM program module is by the filter coefficient of I2C bus configuration passband fluctuation compensating filter, frequency response bucking-out system with the passband fluctuation compensating filter there is not the preceding passband fluctuation of compensation, thereby reduces the passband fluctuation of system.The host computer configuration software disposes the parameter of ARM by local serial ports; Be used for calculating the coefficient of digital broadband repeater passband fluctuation compensating filter with the matlab instrument.
The effect that the present invention 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 Down Convert of the present invention (DDC);
Fig. 3 is the passband fluctuation compensation schematic diagram of the present invention's numeral choosing band repeater.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is the digital optical fiber repeater system schematic diagram.This system includes near-end machine and remote termination, 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 Down Convert of the present invention (DDC).The method that we adopt is after analog-to-digital conversion (ADC), inserts a FIR compensating filter before in Digital Down Convert (DDC), and passband fluctuation compensating filter position promptly as shown in Figure 2.The coefficient of FIR compensating filter can come Configuration Online by I2C (Inter-Integrated Circuit) bus by ARM.
Fig. 3 is the passband fluctuation compensation schematic diagram of digital high-frequency amplification station of the present invention.The step of specific implementation is:
1. at first by the passband fluctuation of test digital direct discharging station under the situation that does not have the passband fluctuation compensation.Digital high-frequency amplification station is under the situation that does not have the passband fluctuation compensation, and the input of system adds sinusoidal wave swept-frequency signal, and frequency spectrograph is received in system's output, can obtain the frequency response of system and the passband fluctuation in the system works frequency range.Such as at the GSM digital direct discharging station, the radio frequency center frequency point of downstream signal is that 942M, bandwidth are 24M.Under the situation that does not have the passband fluctuation compensation, the input system frequency is that 930M is to the sinusoidal wave swept-frequency signal of 954M, 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 read the system's passband fluctuation in the GSM digital high-frequency amplification station downstream signal working frequency range from frequency spectrograph.The center frequency point of the radio-frequency input signals of GSM digital high-frequency amplification station down link is 942M, through analog frequency mixing radiofrequency signal is mixed to the analog if signal of 96M, passing through analog-to-digital conversion (ADC) then, to convert sample rate to be that 122.88M, intermediate frequency are the digital medium-frequency signal of 96M.System's passband fluctuation in the GSM digital high-frequency amplification station downstream signal working frequency range of test gained can equivalence be that 122.88M, intermediate frequency are the passband fluctuation of the digital medium-frequency signal of 96M for system in sample rate, as shown in Figure 2.
2. design a FIR compensating filter, this FIR filtering is opposite with the passband fluctuation of system digits intermediate frequency operating frequency range, shown in the dotted line of Fig. 2.The Filter Design method is a lot: can be according to the coefficient that calculates filter after the frequency response discretization through IFFT, or the FIR Filter Design function f ir2 based on the window function method that provides by MATLAB signal processing tool box.The Fir2 function is used to design the windowing linear phase fir digital filter with optional frequency response shape, its form is: b=fir2 (N, f, m, window), its amplitude-frequency characteristic is provided by Frequency point vector f and range value vector m, f is the Frequency point vector, and f ∈ [0,1], when f=1 just corresponding to 0.5 times sample rate.Arrange by ascending order among the vector f, and first is necessary for 0, last is necessary for 1, and allows to occur identical frequency values; Comprise among the vector m and the corresponding expectation filter response of f amplitude; The length of vector f and m must be identical.(m window) can be used for Design of Filter with the window function of appointment among the column vector Windows to b=fir2 for N, f, as omitting Windows, then chooses the Hamming window automatically.
3. the filter coefficient that obtains according to previous calculations is configured to by upper computer software among the ARM of digiboard, and ARM disposes the coefficient of passband fluctuation compensating filter by the I2C bus then.
The present invention adopts Digital Signal Processing to come the passband fluctuation of compensating digits direct discharging station.We add a frequency response FIR filter opposite with the passband fluctuation of system at the system digits intermediate frequency and come the passband fluctuation of bucking-out system.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.
Broad band repeater system passband fluctuation through this method compensation generally can be accomplished＜=1.5db.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 requirement of the present invention.
Claims (2)
1. passband fluctuation compensating digits repeater, include near-end machine and remote termination, it is characterized in that: behind analog-to-digital conversion module, inserted the passband fluctuation compensating filter that a parameter can Configuration Online before Digital Down Converter Module, the frequency response of this passband fluctuation compensating filter is opposite in the response of digital intermediate frequency operating frequency range with system.
2. compensation method of adopting passband fluctuation compensating digits as claimed in claim 1 repeater is characterized in that:
1), system behind analog-to-digital conversion module, before Digital Down Converter Module, insert a passband fluctuation compensating filter, the parameter Configuration Online of passband fluctuation compensating filter;
2), do not having under the situation of passband fluctuation compensation, the input of system adds sinusoidal wave swept-frequency signal, frequency spectrograph is received in system's output, obtains the frequency response of system and the passband fluctuation in the system works frequency range;
3), according to the passband fluctuation of the system of front test gained, design a passband fluctuation compensating filter, the frequency response of passband fluctuation compensating filter is opposite in the response of digital intermediate frequency operating frequency range with system;
4), the passband fluctuation compensating filter parameter that obtains according to front design, the coefficient of configuration passband fluctuation compensating filter does not have passband fluctuation before the compensation with the frequency response bucking-out system of passband fluctuation compensating filter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106209265A (en) * | 2016-06-24 | 2016-12-07 | 武汉虹信通信技术有限责任公司 | The band ripple calibration steps of a kind of broadband signal and device |
| CN109951236A (en) * | 2019-02-28 | 2019-06-28 | 广州开信通讯系统有限公司 | Calibration method and device are fluctuated in a kind of broadband automatically |
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| EP1744455A2 (en) * | 2005-07-12 | 2007-01-17 | Tredess 2010, S.L. | Signal processing system for spectrum shaping |
| CN101815054A (en) * | 2010-04-06 | 2010-08-25 | 京信通信系统（中国）有限公司 | Digital communication system and method for improving flatness in signal band thereof |
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| EP1744455A2 (en) * | 2005-07-12 | 2007-01-17 | Tredess 2010, S.L. | Signal processing system for spectrum shaping |
| CN101815054A (en) * | 2010-04-06 | 2010-08-25 | 京信通信系统（中国）有限公司 | Digital communication system and method for improving flatness in signal band thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106209265A (en) * | 2016-06-24 | 2016-12-07 | 武汉虹信通信技术有限责任公司 | The band ripple calibration steps of a kind of broadband signal and device |
| CN106209265B (en) * | 2016-06-24 | 2018-10-12 | 武汉虹信通信技术有限责任公司 | A kind of the band wave calibration method and device of broadband signal |
| CN109951236A (en) * | 2019-02-28 | 2019-06-28 | 广州开信通讯系统有限公司 | Calibration method and device are fluctuated in a kind of broadband automatically |
| CN109951236B (en) * | 2019-02-28 | 2022-04-12 | 广州开信通讯系统有限公司 | Broadband automatic fluctuation calibration method and device |
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Application publication date: 20110330 |