CN102904628A - Consistency compensation method for gains of digital frequency-selecting repeater - Google Patents
Consistency compensation method for gains of digital frequency-selecting repeater Download PDFInfo
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- CN102904628A CN102904628A CN2012103870604A CN201210387060A CN102904628A CN 102904628 A CN102904628 A CN 102904628A CN 2012103870604 A CN2012103870604 A CN 2012103870604A CN 201210387060 A CN201210387060 A CN 201210387060A CN 102904628 A CN102904628 A CN 102904628A
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Abstract
The invention provides a consistency compensation method for gains of a digital frequency-selecting repeater, which comprises the steps of generating a group of single-tone signal source by using a fixture plate, connecting the single-tone signal source to a remote terminal by a radio frequency opening, carrying out power statistics to the single-tone signal source by an FPGA (Field Programmable Gate Array) of the remote terminal, determining a standard power value, and determining the to-be-adjusted gain error of each carrier wave by digital ARM of the remote terminal to use the power of the standard power ratio signal source. The in-band fluctuation of the digital repeater system is compensated by adjusting the power of each carrier wave; the compensation is simply and effectively realized; and the design difficulty for the in-band fluctuation of the digital repeater system is greatly reduced. The beneficial effects are as follows: greater gain errors of analog devices of the system are cancelled by using the digital technology and the errors are simply and effectively cancelled; the design difficulty for the in-band gain consistency of the repeater is greatly reduced; and the method provided by the invention has great reference and practical significances to solve the technical problems existing in the similar design.
Description
Technical field
The present invention relates to mobile communications network and cover and the optimization field, mainly is the method for a kind of digital frequency-selecting repeater gain uniformity 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.If but the repeater parameter arranges the improper performance that can have a strong impact on equally donor base station, reduce network running quality, especially repeater reducing noise the receiving sensitivity of base station receiver, reduced coverage.
The noise factor of repeater mainly refers to the upstream noise introducing donor base station of repeater on the impact of donor base station.Because digital optical fiber direct station is comprised of a near-end machine and Duo Tai remote termination, in the cascade environment, if the gain of each remote termination difference slightly, the high remote termination that then gains can be contributed extra noise, so that the cascade noise of whole system is higher.Therefore, in order to reduce the cascade noise coefficient of many remote terminations, the gain consistency of each remote termination is had higher requirement, require different remote terminations gain error in whole passband to be controlled in the 0.5dB, for this requirement, gain uniformity compensation method as herein described has been proposed.
Summary of the invention
Purpose of the present invention is just in order to overcome the deficiency of above-mentioned technology, and the method for a kind of digital frequency-selecting repeater gain uniformity compensation is provided.
The present invention solves the technical scheme that its technical problem adopts: the method for this digital frequency-selecting repeater gain uniformity compensation, produce one group of tone signal source with working plate, the tone signal source is connected to remote termination by the radio frequency mouth, the FPGA of remote termination carries out power statistic to the tone signal source, and definite reference power value, the digital ARM of remote termination determines the gain error value that each carrier wave need to be adjusted with the power of reference power than signal source.Adopt the power of adjusting each carrier wave to come the passband fluctuation of compensating digits direct discharging station, implement simply effectively, reduced greatly the design difficulty of this piece of direct discharging station passband fluctuation.
The tone signal power that working plate produces be-55dB, and the channel number of frequency and equipment under test has one to one relation, and tone signal need to calibrate, and guarantees that the signal that the frock proximal plate is launched is smooth in whole frequency band, and error is less than 0.1dB.
The FPGA power statistic of described remote termination, the performance number of each frequency is corresponding one by one with the channel number of working plate, selects center frequency point as reference power.
The digital ARM of remote termination is with the power of reference power than signal source, calculate the gain error value that each carrier wave need to be adjusted, and the form of making look-up table is put into memory, and gain error value and channel number are corresponding one by one, according to used channel number, find corresponding channel gain error amount by look-up table.
The effect that the present invention is useful is: adopt digital technology to come the larger gain error of bucking-out system analogue device, implement very simple and efficient, reduce greatly the conforming design difficulty of gain in the direct discharging station band, 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 Digital Up Convert of the present invention (DDC) oscillation compensation schematic diagram;
Fig. 3 be when calibration working plate, proximal plate be connected the connection block diagram with distal plate
Fig. 4 is that practical communication working plate, proximal plate and distal plate are connected the connection block diagram.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, reach for example below in conjunction with accompanying drawing, the present invention is further elaborated.Should be appreciated that described herein giving an example only in order to explain the present invention, be not intended to limit the present invention.
The present invention adopts the power that baseband signal is adjusted every carrier wave to come the gain consistency of bucking-out system.Because in operating frequency range, the power output of every carrier wave has fluctuation.Thereby can make every carrier wave in the situation that input power is identical by adjusting the power of each carrier wave, output-power fluctuation diminishes.Concrete design philosophy comprises working plate calibration and practical communication two parts, is described below:
During the working plate calibration:
(1) produces one group of tone signal with a near-end machine as working plate.The frequency of tone signal and the channel number of equipment under test have one to one relation, and tone signal need to calibrate, and guarantee that the signal of frock proximal plate emission is smooth in whole frequency band, and error is less than 0.1dB.
(2) working plate and remote termination communicate.Working plate is comprised of two parts with communicating by letter of remote termination: a part is that the signal source that working plate produces is connected to remote termination as the input signal of remote termination up link through the radio frequency mouth, is designated as input signal A1; Another part is that the corresponding channel number of signal source that working plate produces arrives the FPGA of remote termination by Optical Fiber Transmission as control word.
(3) remote termination FPGA statistics power.The FPGA of remote termination is to input signal A1 power statistics, and this group performance number is designated as: P0, P1, P2, P3 ... Pm ... Pn, the channel number of initiating with working plate is corresponding one by one.When the FPGA of remote termination communicated by letter with digital ARM, channel number was at first appointed, therefore only need to the performance number of depositing RAM, be reported to the ARM of digiboard to get final product by the I2C bus in the communication.
(4) determine the gain error value of respective channels.By the input power value that (3) obtain, select Pm as reference power.The digital ARM of remote termination is reference power Pm and power P 0, P1, P2, P3 ... Pm ... Pn compares, and obtains gain error value a0, a1, a2, a3 ... am ... an, for example:
This Error Gain value is corresponding with channel number, and the yield value of each channel has just been determined like this, and the form that the gain error value is made look-up table is put into memory.
During practical communication:
(1) disconnect communicating by letter of working plate and remote termination, near-end machine and remote termination carry out proper communication.
Used channel number when (2) the digital ARM of remote termination is according to practical communication finds corresponding channel gain error amount by look-up table.By the I2C bus, required channel errors yield value is uploaded to the FPGA of remote termination simultaneously.Power control module is realized the gain uniformity compensation to each carrier wave among the DDC of FPGA the inside.
Fig. 1 digital optical fibre frequency-selecting repeater signal flow is divided into down link and up link.The transmission course of down link signal is: base station signal is out delivered to duplexer, duplexer radiofrequency signal out is through down-conversion, be converted into analog if signal, analog if signal is through analog-to-digital conversion, be converted into digital medium-frequency signal, in the FPGA the inside, digital medium-frequency signal is processed, be converted into baseband signal, then deliver to remote termination by optical fiber, remote termination is through Digital Up Convert, baseband signal is converted into digital medium-frequency signal, delivers to D/A converter, be converted into radiofrequency signal through the simulation up-conversion again, radiofrequency signal is processed through duplexer, gives at last the user.The transmission course of uplink signal is similar.
Fig. 2 is the realization block diagram of up link Digital Down Convert of the present invention (DDC), can see that we have added a power control module after mixing in Digital Down Convert, extraction, the filtering, the effect of this module is exactly the power output of adjusting each carrier wave, for the gain uniformity compensation 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) being multiplied each other with the power control value of every carrier wave respectively again through cut position, processing rounds up.
For Fig. 3 and Fig. 4, the debugging of key technology is summarized as follows:
(1) working plate is launched one group through the sinusoidal signal of calibration.Requirement to this group sinusoidal signal: the frequency of each sinusoidal signal is corresponding with the channel number of equipment under test, passband fluctuation≤0.1dB, and signal power is-55dB.
(2) reference signal: by experiment checking, use the center frequency point of signal source A1 as reference signal, the effect of passband fluctuation compensation is best.
(3) calculating of gain error:
(Pm is reference power, and Pn is the power of n channel), the yield value error amount of each carrier wave is corresponding one by one with channel number.
(4) through the power control module of DDC, the baseband complex signal of output is: X=an* (I+Q*j) can be controlled within the 0.5dB through the system's passband fluctuation after the adjustment carrier power.
The above is only to be preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvement and modification, these improvement and modification also should be considered as protection scope of the present invention.
Claims (4)
1. the method for digital frequency-selecting repeater gain uniformity compensation, it is characterized in that: produce one group of tone signal source with working plate, the tone signal source is connected to remote termination by the radio frequency mouth, the FPGA of remote termination carries out power statistic to the tone signal source, and definite reference power value, the digital ARM of remote termination determines the gain error value that each carrier wave need to be adjusted with the power of reference power than signal source.
2. the method for digital frequency-selecting according to claim 1 repeater gain uniformity compensation, it is characterized in that: the tone signal power that working plate produces is-55dB, the channel number of frequency and equipment under test has one to one relation, and tone signal need to be calibrated, the signal of guaranteeing the emission of frock proximal plate is smooth in whole frequency band, and error is less than 0.1dB.
3. the method for digital frequency-selecting according to claim 1 repeater gain uniformity compensation, it is characterized in that: the FPGA power statistic of described remote termination, the performance number of each frequency is corresponding one by one with the channel number of working plate, selects center frequency point as reference power.
4. the method for digital frequency-selecting according to claim 1 repeater gain uniformity compensation, it is characterized in that: the digital ARM of remote termination is with the power of reference power than signal source, calculate the gain error value that each carrier wave need to be adjusted, and the form of making look-up table is put into memory, and gain error value and channel number are corresponding one by one, according to used channel number, find corresponding channel gain error amount by look-up table.
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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 |
| CN111610377A (en) * | 2020-04-27 | 2020-09-01 | 宁波锐眼电子科技有限公司 | Antenna test system, method, millimeter wave radar, and computer-readable storage medium |
| CN113219828A (en) * | 2021-04-22 | 2021-08-06 | 中国电子科技集团公司第二十九研究所 | Control method for gain consistency of multi-channel analog optical module |
| CN115426227A (en) * | 2022-08-05 | 2022-12-02 | 四川天邑康和通信股份有限公司 | Method and system for setting carrier frequency of repeater and repeater |
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| CN1640007A (en) * | 2001-11-20 | 2005-07-13 | 高通股份有限公司 | Reverse link power controlled repeater |
| CN1695335A (en) * | 2002-10-23 | 2005-11-09 | 株式会社日立国际电气 | Transmitter |
| CN201039172Y (en) * | 2007-03-30 | 2008-03-19 | 厦门特力通科技有限公司 | Intelligent repeater |
| CN101621323A (en) * | 2009-07-31 | 2010-01-06 | 武汉虹信通信技术有限责任公司 | Method for optimizing flatness index of repeater |
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- 2012-10-11 CN CN2012103870604A patent/CN102904628A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1640007A (en) * | 2001-11-20 | 2005-07-13 | 高通股份有限公司 | Reverse link power controlled repeater |
| CN1695335A (en) * | 2002-10-23 | 2005-11-09 | 株式会社日立国际电气 | Transmitter |
| CN201039172Y (en) * | 2007-03-30 | 2008-03-19 | 厦门特力通科技有限公司 | Intelligent repeater |
| CN101621323A (en) * | 2009-07-31 | 2010-01-06 | 武汉虹信通信技术有限责任公司 | Method for optimizing flatness index of repeater |
Cited By (6)
| 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 |
| CN111610377A (en) * | 2020-04-27 | 2020-09-01 | 宁波锐眼电子科技有限公司 | Antenna test system, method, millimeter wave radar, and computer-readable storage medium |
| CN113219828A (en) * | 2021-04-22 | 2021-08-06 | 中国电子科技集团公司第二十九研究所 | Control method for gain consistency of multi-channel analog optical module |
| CN113219828B (en) * | 2021-04-22 | 2022-07-05 | 中国电子科技集团公司第二十九研究所 | Control method for gain consistency of multi-channel analog optical module |
| CN115426227A (en) * | 2022-08-05 | 2022-12-02 | 四川天邑康和通信股份有限公司 | Method and system for setting carrier frequency of repeater and repeater |
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Application publication date: 20130130 |