CN102025666B - Method and device for realizing IQ signal correction in base station transmitter equipment - Google Patents
Method and device for realizing IQ signal correction in base station transmitter equipment Download PDFInfo
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- CN102025666B CN102025666B CN201010589131.XA CN201010589131A CN102025666B CN 102025666 B CN102025666 B CN 102025666B CN 201010589131 A CN201010589131 A CN 201010589131A CN 102025666 B CN102025666 B CN 102025666B
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Abstract
The invention provides a method and device for realizing IQ signal correction in base station transmitter equipment. The device comprises a control circuit, a radio frequency signal forming module and a radio frequency signal power amplification circuit, wherein the control circuit finishes initial configuration according to a working frequency point, controls to close the radio frequency signal power amplification circuit and cuts off a baseband signal, and outputs an IQ correction order to the radio frequency signal forming module if the control circuit judges that an analogue IQ signal is unbalanced according to the radio frequency signal power at the input end of the radio frequency signal power amplification circuit; the radio frequency signal forming module modulates the default analogue IQ signal into a corresponding radio frequency signal according to the initial configuration of the control circuit and outputs the radio frequency signal to the radio frequency signal power amplification circuit, and adjusts the analogue IQ signal according to the IQ correction order; and the radio frequency signal power amplification circuit outputs the detected radio frequency signal power at the input end to the control circuit. Through using the method and device, the local oscillator interference caused by the unbalanced IQ signal in the base station can be effectively suppressed in time.
Description
Technical field
The present invention relates to radio communication base station transmitter equipment, particularly relate to method and device that time division duplex (TDD, Time Division Duplex) system wireless base station transmitter realizes I/Q signal calibration.
Background technology
In radio communication base station structure, transmission channel design often uses high intermediate frequency I/Q modulator scheme, and the orthogonality of I/Q signal can offset the image frequency of local frequency and local frequency effectively, thus has and applies more widely than frequency mixer.
In actual use, the in-phase component (I) of transmission channel and quadrature component (Q) more or less also exist the imbalance of amplitude and phase place.Generally the I/Q signal degree of unbalance of numeric field is very little, therefore, the impact of digital-to-analogue conversion (DAC, Digital Analog Converting) to IQ quadrature modulation upconverter (i.e. I/Q modulator) is mainly considered to I/Q signal imbalance.
The amplitude difference of I/Q signal and quadrature in phase sex differernce can produce local frequency and its image frequency.Especially, in wide-band communication system (referring to that the bandwidth of operation of system is greater than IF-FRE), I/Q signal imbalance can produce DC component, and consequent local oscillator interference can be fallen in work strip.For the system of loading arrowband, front end cavity body filter, very high local oscillation frequency signal can be fallen outside the band of front end filter, and this mismatch can bring very large return loss, and the standing wave seriously affecting power amplifier detects.
Need the I/Q signal amplitude and the phase place that adjust DAC output in actual use, approach the orthogonal property of desirable I/Q signal, this is called as DAC calibration.This DAC calibrates normally in the process of production base station equipment, the amplitude of DAC corresponding for certain frequency output analog I/Q signal and the register adjusted value of phase difference is write in memory as DAC configuration.When base station transmitter equipment changes to certain frequency, from memory, just read corresponding DAC configure, adjust the balance of I/Q signal, thus the local frequency suppressing I/Q modulator to export and image frequency thereof.
Traditional DAC calibration steps carries out calibration when production base station equipment to the I/Q signal of frequency one by one to write table, configured corresponding DAC register value and realized during use by meter reading.If the bandwidth of operation of base station equipment is very wide, the time that DAC calibration in process of production (namely table is write in calibration) can be expensive, greatly have impact on the production efficiency of equipment thus.For 200MHz bandwidth of operation, every the calibration of 5MHz interval frequency once, if the time of each calibration is 15s, so the DAC alignment time of a transmission channel of a base station equipment is 10 minutes, if there are 4 transmission channels base station, then its DAC alignment time will spend 40 minutes.And very expensive for the radio frequency instrument of DAC calibration, thus, calibrator (-ter) unit also can substantially increase production cost.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method and device of realizing IQ signal correction in base station transmitter equipment, in time, effectively can suppress the local oscillator interference that the I/Q signal of base station transmitter equipment imbalance is brought.
In order to solve the problems of the technologies described above, the invention provides a kind of device of realizing IQ signal correction in base station transmitter equipment, comprise the control circuit, radiofrequency signal formation module and the radiofrequency signal power amplifier that connect successively, wherein:
Control circuit, is also connected with radiofrequency signal power amplifier, for completing initial configuration according to working frequency points, and controls close radiofrequency signal power amplifier and cut off baseband signal; Judge that analog I/Q signal is uneven according to the input RF signal power that radiofrequency signal power amplifier detects, then form module to radiofrequency signal and export IQ calibration command;
Radiofrequency signal forms module, becomes corresponding radiofrequency signal to export to radiofrequency signal power amplifier the analog I/Q signal madulation of acquiescence for the initial configuration according to control circuit; According to IQ calibration command adjustment analog I/Q signal;
Radiofrequency signal power amplifier, for exporting to control circuit by the input RF signal power of detection;
Control circuit obtains local oscillator interference signal by RF signal power, and by the amplitude com parison of the amplitude of local oscillator interference signal and a reference signal, according to comparative result, if judge, analog I/Q signal does not meet balance requirement, then form module to radiofrequency signal and export IQ calibration command; If judge, analog I/Q signal meets balance requirement, then control open radiofrequency signal power amplifier and be communicated with baseband signal.
Further, radiofrequency signal forms module and comprises the D/A converting circuit, IQ modulation circuit, the filtering and amplifying circuit that connect successively, also comprises the local oscillator feedback circuit be connected with control circuit, wherein:
D/A converting circuit, for converting digital I/Q signal to analog I/Q signal, and is exported by dac register; IQ calibration command according to control circuit adjusts the amplitude of analog I/Q signal or phase place;
Local oscillator feedback circuit, for exporting local oscillation signal to IQ modulation circuit under the control of control circuit;
IQ modulation circuit, under the effect of local oscillation signal, becomes corresponding radiofrequency signal by analog I/Q signal madulation;
Filtering and amplifying circuit, carries out filtering for radio frequency signal and amplifies process;
Radiofrequency signal power amplifier exports after carrying out power amplification through the radiofrequency signal of filtering and amplification process.
Further,
Control circuit is when powering on and/or when working frequency points changes, complete analog I/Q signal, the local oscillator frequency of local oscillator feedback circuit and the initial configuration of radiofrequency signal power amplifier of logarithmic mode translation register acquiescence according to the working frequency points obtained, control close radiofrequency signal power amplifier and cut off baseband signal.
Further,
Control circuit is the amplitude of the amplitude > reference signal of local oscillator interference signal according to comparative result, judges that I/Q signal does not meet balance requirement; Be the amplitude of the amplitude≤reference signal of local oscillator interference signal according to comparative result, judge that I/Q signal meets balance requirement.
In order to solve the problems of the technologies described above, the invention provides a kind of method using device as the aforementioned to realize I/Q signal calibration in base station transmitter equipment, comprising:
Base station transmitter equipment is when powering on or change working frequency points, and the working frequency points according to obtaining completes initial configuration, and closes the final stage power amplifier of radiofrequency signal and cut off baseband signal;
According to initial configuration, the analog I/Q signal madulation of acquiescence is become corresponding radiofrequency signal;
Judge that analog I/Q signal is uneven according to the RF signal power detected from final stage power amplifier input, then adjust this analog I/Q signal.
Further,
Base station transmitter equipment completes initial configuration according to the working frequency points obtained, and comprises the configuration of the analog I/Q signal of logarithmic mode translation register acquiescence, local oscillator frequency needed for modulation analog I/Q signal and radiofrequency signal power amplifier.
Further, judge that analog I/Q signal is uneven according to the RF signal power detected from final stage power amplifier input, then adjust this analog I/Q signal, specifically comprise:
Local oscillator interference signal is obtained by the RF signal power detected, and by the amplitude com parison of the amplitude of local oscillator interference signal and a reference signal;
Be the amplitude of the amplitude > reference signal of local oscillator interference signal according to comparative result, judge that analog I/Q signal does not meet balance requirement, then adjust amplitude and the phase place of analog I/Q signal.
Further, it is the amplitude of the amplitude≤described reference signal of local oscillator interference signal according to comparative result, judge that analog I/Q signal meets balance requirement, then write in memory through the analog I/Q signal of adjustment as the digital-to-analogue conversion Configuration Values upgraded using in current dac register, control open final stage power amplifier and be communicated with baseband signal.
Further, opening final stage power amplifier and after being communicated with baseband signal, also comprising:
Convert the digital I/Q signal converted by baseband signal to analog I/Q signal, and exported by dac register;
Under the effect of local oscillation signal, analog I/Q signal madulation is become corresponding radiofrequency signal, and exports after carrying out filter amplifying processing and power amplification.
DAC calibration of the present invention is mainly for easily producing the unbalanced artificial circuit part of I/Q signal, the uneven local oscillation frequency signal brought of I/Q signal is detected by the input end signal performance number reading power amplifier, and compare with the local oscillation frequency signal fiducial value preset, if difference does not meet the demands, readjust DAC register, until this difference meets the demands.
Apparatus structure of the present invention is simple, does not rely on building of instrument and platform, has broken away from the requirement to calibration instrument; And method is easily implemented, calibration only take base station complete power on operation before aperture time, and when base station frequency point changes, the space before utilizing base station to configure is readjusted DAC register and is completed calibration.Therefore, one aspect of the present invention can meet the requirement of base station transmitter real time calibration, thus the local oscillator interference that can in time, effectively suppress the I/Q signal of base station transmitter imbalance to be brought; On the other hand write table owing to not needing to carry out DAC calibration when production base station equipment, therefore the production efficiency of base station equipment can be improved.
The method and apparatus of I/Q signal of the present invention calibration does not need special circuit, and its just in addition improvement on control software design, therefore can directly apply in the base station system that major part is similar.
Accompanying drawing explanation
Fig. 1 is the configuration diagram of the I/Q signal calibrating installation embodiment in time division duplex base station transmitter equipment of the present invention;
Fig. 2 is the flow chart that time division duplex base station transmitter equipment of the present invention realizes the embodiment of the method for I/Q signal calibration.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, technical scheme of the present invention is set forth in detail.The embodiment below exemplified only for instruction and explanation of the present invention, and does not form the restriction to technical solution of the present invention.
As shown in Figure 1, illustrate the framework of the I/Q signal calibrating installation embodiment in time division duplex base station transmitter equipment of the present invention, this device embodiment comprises the control circuit, radiofrequency signal formation module and the radiofrequency signal power amplifier that connect successively, wherein:
Control circuit, is connected with radiofrequency signal power amplifier, for completing initial configuration according to working frequency points, and controls close radiofrequency signal power amplifier and cut off baseband signal; Judge that I/Q signal is uneven according to the RF signal power that radiofrequency signal power amplifier detects, then form module to radiofrequency signal and export IQ calibration command;
Radiofrequency signal forms module, becomes corresponding radiofrequency signal to export to radiofrequency signal power amplifier the analog I/Q signal madulation of acquiescence for the initial configuration according to control circuit; According to IQ calibration command adjustment analog I/Q signal;
Radiofrequency signal power amplifier, for exporting to control circuit by the input radio frequency signal power of detection.
Control circuit obtains local oscillator interference signal by RF signal power, and by the amplitude com parison of the amplitude of this local oscillator interference signal and a reference signal, according to comparative result, if judge, analog I/Q signal does not meet balance requirement, then form module to radiofrequency signal and export IQ calibration command; If judge, analog I/Q signal meets balance requirement, then control open radiofrequency signal power amplifier and be communicated with baseband signal.
Radiofrequency signal shown in Fig. 1 forms module and comprises the DAC-circuit, IQ modulation circuit, the filtering and amplifying circuit that connect successively further, also comprises the local oscillator feedback circuit be connected with control circuit, wherein:
DAC-circuit, the digital I/Q signal for being exported by digital intermediate frequency circuit is converted to analog I/Q signal and is exported by DAC register; IQ calibration command according to control circuit adjusts the amplitude of analog I/Q signal or phase place;
Local oscillator feedback circuit, for exporting local oscillation signal to IQ modulation circuit under the control of control circuit;
IQ modulation circuit, under the effect of local oscillation signal, becomes corresponding radiofrequency signal by intermediate frequency analog I/Q signal madulation;
Filtering and amplifying circuit, carries out filtering for radio frequency signal and amplifies process;
This filtering and amplifying circuit inside comprises filter and Multi-stage small signal amplifier, attenuator etc.
Radiofrequency signal power amplifier exports after carrying out power amplification through the radiofrequency signal of filtering and amplification process.
Control circuit is when powering on and/or when working frequency points changes, the initial configuration of analog I/Q signal, local oscillator feedback circuit local oscillator frequency and the radiofrequency signal power amplifier that DAC register is given tacit consent to is completed according to the working frequency points obtained, control figure intermediate-frequency circuit cuts off baseband signal, and controls to close radiofrequency signal power amplifier.Control circuit is the amplitude of the amplitude > reference signal of local oscillator interference signal according to comparative result, judges that analog I/Q signal does not meet balance requirement; Otherwise, be the amplitude of the amplitude≤reference signal of local oscillator interference signal according to comparative result, judge that analog I/Q signal meets balance requirement.
The present invention is directed to above-mentioned DAC calibrating installation embodiment, correspondingly additionally provide time division duplex base station transmitter equipment and realize DAC calibration steps embodiment, its flow process as shown in Figure 2, triggers when powering in base station or change working frequency points and is performed by DAC calibrating installation, comprise the steps:
201: obtain working frequency points, complete initial configuration, and close final stage power amplifier and cut off baseband signal;
At this, the radiofrequency signal power amplifier in final stage power amplifier and DAC calibrating installation; Initial configuration comprises the configuration of I/Q signal default value in DAC register, IQ modulates the configuration of local oscillator frequency and the configuration of final stage power amplifier.
202: detect final stage power amplifier input RF signal power, obtain the local oscillator interference signal because I/Q signal imbalance causes;
203: the local oscillator interference signal amplitude of acquisition and the reference signal amplitude preset are compared;
204: judge whether comparative result meets the requirements, otherwise perform step 205, be perform step 206;
If comparative result is local oscillation signal amplitude > reference signal amplitude, then judge that analog I/Q signal does not meet balance requirement; If comparative result is local oscillation signal amplitude≤reference signal amplitude, then judge that analog I/Q signal does not meet balance requirement.
205: adjustment DAC register value, returns step 202 and performs;
Judge that analog I/Q signal does not meet balance requirement, then adjust the analog I/Q signal value in DAC register, then return to perform and obtain local oscillator interference signal amplitude step, till analog I/Q signal meets balance requirement according to the final stage power amplifier input I/Q signal power detected.
206: complete I/Q signal calibration and upgrade, open final stage power amplifier and be communicated with baseband signal, recover base station and normally work;
Judge that analog I/Q signal meets balance requirement, then write in memory through the analog I/Q signal value of adjustment as the DAC Configuration Values upgraded using in current for DAC-circuit DAC register, control figure intermediate-frequency circuit is communicated with baseband signal simultaneously, and controls open final stage power amplifier and be communicated with baseband signal.
207: judge whether to need to change working frequency points, be, perform and return step 201 and perform, otherwise process ends.
The present invention is based on the automatic detection of I/Q signal input power, the unbalanced calibration of I/Q is completed by control circuit control software design in I/Q signal calibrating installation, to adjust the I/Q signal value that DAC register exports, the Simulation with I of output/Q signal amplitude and phase place is made again to reach balance.
In the past, be write table with specific frequency when table is write in DAC calibration when producing base station products, and in actual use, the amplitude of I/Q signal and phase place can by the impacts of frequency change.And method provided by the invention is real time calibration, above-mentioned impact can be eliminated as early as possible.When powering in base station or need in course of normal operation to change working frequency points or frequency change, the free time before utilizing base station to configure, re-start DAC calibration, the object of real time calibration can be reached thus.
The present invention does not rely on building of instrument and platform, does not need to carry out DAC calibration when producing base station products and writes table, greatly improve the efficiency of I/Q signal calibration in production test; And I/Q signal automatic calibration does not take the base station normal operating time, can meet the requirement of base station transmitter equipment real time calibration.
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, the content of this specification should not be construed as limitation of the present invention.
Claims (9)
1. a device for realizing IQ signal correction in base station transmitter equipment, comprises the control circuit, radiofrequency signal formation module and the radiofrequency signal power amplifier that connect successively, wherein:
Control circuit, is also connected with radiofrequency signal power amplifier, for completing initial configuration according to working frequency points, and controls close radiofrequency signal power amplifier and cut off baseband signal; Judge that analog I/Q signal is uneven according to the input RF signal power that radiofrequency signal power amplifier detects, then form module to radiofrequency signal and export IQ calibration command;
Radiofrequency signal forms module, becomes corresponding radiofrequency signal to export to radiofrequency signal power amplifier the analog I/Q signal madulation of acquiescence for the described initial configuration according to control circuit; Described analog I/Q signal is adjusted according to described IQ calibration command;
Radiofrequency signal power amplifier, for exporting to described control circuit by the input RF signal power of detection;
Described control circuit obtains local oscillator interference signal by described RF signal power, and by the amplitude of described local oscillator interference signal and the amplitude com parison of a reference signal, according to comparative result, if judge, described analog I/Q signal does not meet balance requirement, then form module to described radiofrequency signal and export described IQ calibration command; If judge, described analog I/Q signal meets balance requirement, then control open radiofrequency signal power amplifier and be communicated with baseband signal.
2. according to device according to claim 1, it is characterized in that, radiofrequency signal forms module and comprises the D/A converting circuit, IQ modulation circuit, the filtering and amplifying circuit that connect successively, also comprises the local oscillator feedback circuit be connected with described control circuit, wherein:
D/A converting circuit, for converting digital I/Q signal to analog I/Q signal, and is exported by dac register; Described IQ calibration command according to described control circuit adjusts the amplitude of analog I/Q signal or phase place;
Local oscillator feedback circuit, for exporting local oscillation signal to IQ modulation circuit under the control of described control circuit;
IQ modulation circuit, under the effect of described local oscillation signal, becomes corresponding radiofrequency signal by described analog I/Q signal madulation;
Filtering and amplifying circuit, for carrying out filtering and amplifying process to described radiofrequency signal;
Described radiofrequency signal power amplifier exports after carrying out power amplification through the radiofrequency signal of filtering and amplification process.
3., according to device according to claim 2, it is characterized in that,
Described control circuit is when powering on and/or when working frequency points changes, working frequency points according to obtaining completes analog I/Q signal, the local oscillator frequency of described local oscillator feedback circuit and the described initial configuration of described radiofrequency signal power amplifier given tacit consent to described dac register, controls close described radiofrequency signal power amplifier and cut off described baseband signal.
4., according to device according to claim 3, it is characterized in that,
Described control circuit, according to the amplitude of comparative result for reference signal described in the amplitude > of described local oscillator interference signal, judges that described I/Q signal does not meet balance requirement; Be the amplitude of the amplitude≤described reference signal of described local oscillator interference signal according to comparative result, judge that described I/Q signal meets balance requirement.
5. in base station transmitter equipment, use device as claimed in claim 1 to realize a method for I/Q signal calibration, comprising:
Described base station transmitter equipment is when powering on or change working frequency points, and the working frequency points according to obtaining completes initial configuration, and closes the final stage power amplifier of radiofrequency signal and cut off baseband signal;
According to described initial configuration, the analog I/Q signal madulation of acquiescence is become corresponding radiofrequency signal;
Judge that analog I/Q signal is uneven according to the RF signal power detected from described final stage power amplifier input, then adjust this analog I/Q signal.
6. in accordance with the method for claim 5, it is characterized in that,
Described base station transmitter equipment completes initial configuration according to the working frequency points obtained, and comprises the analog I/Q signal of logarithmic mode translation register acquiescence, modulates the configuration of local oscillator frequency needed for described analog I/Q signal and described radiofrequency signal power amplifier.
7. in accordance with the method for claim 6, it is characterized in that, judge that analog I/Q signal is uneven according to the RF signal power detected from described final stage power amplifier input, then adjust this analog I/Q signal, specifically comprise:
Local oscillator interference signal is obtained by the described RF signal power detected, and by the amplitude of described local oscillator interference signal and the amplitude com parison of a reference signal;
According to the amplitude of comparative result for reference signal described in the amplitude > of described local oscillator interference signal, judge that described analog I/Q signal does not meet balance requirement, then adjust amplitude and the phase place of described analog I/Q signal.
8. in accordance with the method for claim 7, it is characterized in that, it is the amplitude of the amplitude≤described reference signal of described local oscillator interference signal according to comparative result, judge that described analog I/Q signal meets balance requirement, then write in memory through the analog I/Q signal of adjustment as the digital-to-analogue conversion Configuration Values upgraded using in current dac register, control open described final stage power amplifier and be communicated with baseband signal.
9. in accordance with the method for claim 8, it is characterized in that, opening described final stage power amplifier and after being communicated with baseband signal, also comprising:
Convert the digital I/Q signal converted by described baseband signal to analog I/Q signal, and exported by dac register;
Under the effect of local oscillation signal, described analog I/Q signal madulation is become corresponding radiofrequency signal, and exports after carrying out filter amplifying processing and power amplification.
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| CN201010589131.XA CN102025666B (en) | 2010-12-15 | 2010-12-15 | Method and device for realizing IQ signal correction in base station transmitter equipment |
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| CN201010589131.XA CN102025666B (en) | 2010-12-15 | 2010-12-15 | Method and device for realizing IQ signal correction in base station transmitter equipment |
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| CN102025666A CN102025666A (en) | 2011-04-20 |
| CN102025666B true CN102025666B (en) | 2015-06-03 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710268B (en) * | 2012-05-31 | 2015-03-25 | 澜起科技（上海）有限公司 | Low/intermediate-frequency receiver |
| CN103199914A (en) * | 2012-07-02 | 2013-07-10 | 深圳格兰泰克科技有限公司 | Frequency shift repeater based on frequency difference digital compensation and frequency difference digital compensation method |
| CN107547458B (en) * | 2016-06-28 | 2021-04-20 | 中兴通讯股份有限公司 | Method and device for setting mirror image suppression parameters in IQ modulation and radio remote unit |
| CN108259404B (en) | 2018-01-12 | 2020-01-17 | 深圳锐越微技术有限公司 | IQ two-path imbalance generation-based signal calibration method, device and equipment |
| CN112583425B (en) * | 2019-09-30 | 2022-07-15 | 武汉杰开科技有限公司 | Detection regulating circuit and transmitter |
| CN111510406B (en) * | 2020-06-03 | 2024-05-17 | 上海创远仪器技术股份有限公司 | Circuit and method for realizing broadband IQ modulation real-time predistortion calibration |
| CN112564628B (en) * | 2020-12-08 | 2023-08-08 | 东南大学 | Modulator with wide frequency band high local oscillation inhibition degree |
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| CN1662080A (en) * | 2004-02-25 | 2005-08-31 | 华为技术有限公司 | System and method for compensating nonideal characteristics of transmitter in base station |
| CN101442511A (en) * | 2007-11-23 | 2009-05-27 | 中兴通讯股份有限公司 | Method and apparatus for improving radio frequency index of zero intermediate frequency transmitter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1662080A (en) * | 2004-02-25 | 2005-08-31 | 华为技术有限公司 | System and method for compensating nonideal characteristics of transmitter in base station |
| CN101442511A (en) * | 2007-11-23 | 2009-05-27 | 中兴通讯股份有限公司 | Method and apparatus for improving radio frequency index of zero intermediate frequency transmitter |
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