CN102025666A - 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
- Publication number
- CN102025666A CN102025666A CN201010589131XA CN201010589131A CN102025666A CN 102025666 A CN102025666 A CN 102025666A CN 201010589131X A CN201010589131X A CN 201010589131XA CN 201010589131 A CN201010589131 A CN 201010589131A CN 102025666 A CN102025666 A CN 102025666A
- Authority
- CN
- China
- Prior art keywords
- signal
- analog
- radiofrequency signal
- power amplifier
- amplitude
- 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.)
- Granted
Links
Images
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 sender equipment, relate in particular to method and device that time division duplex (TDD, TimeDivision Duplex) system wireless base station sender is realized the IQ signal calibration.
Background technology
In the radio communication base station structure, high intermediate frequency IQ modulator approach is often used in transmission channel design, and the orthogonality of IQ signal can be offset the image frequency of local frequency and local frequency effectively, thereby has than frequency mixer and use more widely.
In actual use, in-phase component of transmission channel (I) and quadrature component (Q) more or less exist the imbalance of amplitude and phase place.The IQ signal degree of unbalance of numeric field is very little generally speaking, therefore, mainly is to consider the influence of digital-to-analogue conversion (DAC, Digital AnalogConverting) to IQ quadrature modulation upconverter (being the IQ modulator) to IQ signal imbalance.
The amplitude difference of IQ signal and phase orthogonality difference can produce local frequency and its image frequency.Especially in wide-band communication system (bandwidth of operation that refers to system is greater than IF-FRE), the IQ signal is uneven can to produce DC component, and consequent local oscillator interference can be fallen in the work zone.For the system of front end loading arrowband cavity body filter, very high local frequency signal can be fallen outside the band of front end filter, and this mismatch can be brought very big return loss, and the standing wave that seriously influences power amplifier detects.
Need to adjust the IQ signal amplitude and the phase place of DAC output in actual use, approach the orthogonal property of desirable IQ signal, this is called as the DAC calibration.This DAC calibration normally in the process of production base station equipment, with the register adjusted value of the amplitude of the DAC output analog I signal of certain frequency correspondence and phase difference as DAC configuration write in the memory.When certain frequency is arrived in base station sender equipment replacement, just from memory, read corresponding D AC configuration, adjust the balance of IQ signal, thereby suppress the local frequency and the image frequency thereof of the output of IQ modulator.
Traditional DAC calibration steps is the IQ signal of frequency one by one to be calibrated to write table when the production base station equipment, during use by meter reading and dispose corresponding D AC register value and realize.If the bandwidth of operation of base station equipment is very wide, the time that DAC calibration in process of production (i.e. table is write in calibration) can be expensive, influenced efficiency of equipment thus greatly.With the 200MHz bandwidth of operation is example, every the frequency calibration of 5MHz interval once, if time of each some calibration is 15s, the DAC alignment time of a base station equipment transmission channel is 10 minutes so, if there are 4 transmission channels the base station, then its DAC alignment time will spend 40 minutes.And the radio frequency instrument that is used for the DAC calibration is very expensive, and thus, calibrator (-ter) unit also can improve production cost greatly.
Summary of the invention
Technical problem to be solved by this invention provides method and the device that a kind of base station sender equipment is realized the IQ signal calibration, can suppress the local oscillator that the IQ signal imbalance of base station sender equipment brought in time, effectively and disturb.
In order to solve the problems of the technologies described above, the invention provides the device that a kind of base station sender equipment is realized the IQ signal calibration, comprise that the control circuit, the radiofrequency signal that connect successively form module and radiofrequency signal power amplifier, wherein:
Control circuit also is connected with the radiofrequency signal power amplifier, be used for finishing initial configuration according to working frequency points, and control is closed the radiofrequency signal power amplifier and cut off baseband signal; Judge analog I signal imbalance according to the input radiofrequency signal power that the radiofrequency signal power amplifier detects, then form module output IQ calibration command to radiofrequency signal;
Radiofrequency signal forms module, is used for according to the initial configuration of control circuit the radiofrequency signal that the analog I signal of giving tacit consent to is modulated into correspondence being exported to the radiofrequency signal power amplifier; Adjust the analog I signal according to the IQ calibration command;
The radiofrequency signal power amplifier is used for the input radiofrequency signal power that detects is exported to control circuit.
Further,
Control circuit obtains the local oscillator interference signal by radiofrequency signal power, and relatively with the amplitude of the amplitude of local oscillator interference signal and a reference signal, according to comparative result, do not meet the balance requirement if judge the analog I signal, then form module output IQ calibration command to radiofrequency signal; Meet the balance requirement if judge the analog I signal, then control is opened the radiofrequency signal power amplifier and is communicated with baseband signal.
Further, radiofrequency signal forms module and comprises D/A converting circuit, IQ modulation circuit, the amplification filtering circuit that connects successively, also comprises the local oscillator feedback circuit that is connected with control circuit, wherein:
D/A converting circuit is used for digital IQ conversion of signals is become the analog I signal, and exports by dac register; IQ calibration command according to control circuit is adjusted the amplitude or the phase place of analog I signal;
The local oscillator feedback circuit is used under the control of control circuit to IQ modulation circuit output local oscillation signal;
The IQ modulation circuit is used under the effect of local oscillation signal, and the analog I signal is modulated into corresponding radiofrequency signal;
The amplification filtering circuit is used for radiofrequency signal is carried out filtering and processing and amplifying;
The radiofrequency signal power amplifier will carry out exporting after the power amplification through the radiofrequency signal of filtering and processing and amplifying.
Further,
Control circuit is when powering on and/or when working frequency points changes, finish analog I signal, the local oscillator frequency of local oscillator feedback circuit and the initial configuration of radiofrequency signal power amplifier that the logarithmic mode translation register is given tacit consent to according to the working frequency points of obtaining, control is closed the radiofrequency signal power amplifier and is 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 the IQ signal does not meet the balance requirement; According to comparative result is the amplitude of the amplitude≤reference signal of local oscillator interference signal, judges that the IQ signal meets the balance requirement.
In order to solve the problems of the technologies described above, the invention provides a kind of method of device realization IQ signal calibration as the aforementioned of in the sender equipment of base station, using, comprising:
Base station sender equipment is finished initial configuration according to the working frequency points of obtaining when powering on or change working frequency points, and closes the final stage power amplifier of radiofrequency signal and cut off baseband signal;
The analog I signal of acquiescence is modulated into the radiofrequency signal of correspondence according to initial configuration;
Judge analog I signal imbalance according to the radiofrequency signal power that detects from the final stage power amplifier input, then adjust this analog I signal.
Further,
Base station sender equipment is finished initial configuration according to the working frequency points of obtaining, and comprises the local oscillator frequency that analog I signal, the modulation analog I signal of logarithmic mode translation register acquiescence is required and the configuration of radiofrequency signal power amplifier.
Further, judge analog I signal imbalance, then adjust this analog I signal, specifically comprise according to the radiofrequency signal power that detects from the final stage power amplifier input:
Obtain the local oscillator interference signal by the radiofrequency signal power that detects, and the amplitude of local oscillator interference signal and the amplitude of a reference signal are compared;
According to comparative result is the amplitude of the amplitude＞reference signal of local oscillator interference signal, judges that the analog I signal does not meet the balance requirement, then adjusts the amplitude and the phase place of analog I signal.
Further, according to comparative result is the amplitude of the amplitude≤described reference signal of local oscillator interference signal, judge that the analog I signal meets the balance requirement, then the analog I signal through adjusting in the current dac register is write in the memory as the digital-to-analogue conversion Configuration Values that upgrades, control is opened final stage power amplifier and is communicated with baseband signal.
Further, after opening final stage power amplifier and being communicated with baseband signal, also comprise:
To become the analog I signal by the digital IQ conversion of signals of baseband signal conversion, and export by dac register;
Under the effect of local oscillation signal, the analog I signal is modulated into corresponding radiofrequency signal, and exports after filter amplifying processing and the power amplification carrying out.
DAC calibration of the present invention is primarily aimed at the unbalanced artificial circuit part of easy generation IQ signal, detect the local frequency signal that IQ signal imbalance is brought by the input end signal performance number that reads power amplifier, and compare with default local frequency signal criterion value, readjust the DAC register if difference does not meet the demands, meet the demands until this difference.
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 implemented easily, and calibration only takies the base station and finishes the preoperative aperture time that powers on, and when base station frequency point changes, utilizes base station configuration to finish preceding space and readjusts the DAC register and finish calibration.Therefore, one aspect of the present invention can satisfy the requirement of base station sender real time calibration, disturbs thereby can suppress the local oscillator that the IQ signal imbalance of base station sender brought in time, effectively; Do not write table owing to need when the production base station equipment, not carry out the DAC calibration on the other hand, so can improve the production efficiency of base station equipment.
The method and apparatus of IQ signal calibration of the present invention does not need special circuit, its just on Control Software in addition improvement, therefore in the similar base station system of major part, can directly use.
Description of drawings
Fig. 1 is the configuration diagram of the IQ signal calibration device embodiment in the sender equipment of time division duplex of the present invention base station;
Fig. 2 is the flow chart that time division duplex of the present invention base station sender equipment is realized the method embodiment of IQ signal calibration.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment technical scheme of the present invention is at length set forth.The embodiment that below exemplifies only is used for description and interpretation the present invention, and does not constitute the restriction to technical solution of the present invention.
As shown in Figure 1, represented the framework of the IQ signal calibration device embodiment in the sender equipment of time division duplex of the present invention base station, this device embodiment comprises that the control circuit, the radiofrequency signal that connect successively form module and radiofrequency signal power amplifier, wherein:
Control circuit is connected with the radiofrequency signal power amplifier, be used for finishing initial configuration according to working frequency points, and control is closed the radiofrequency signal power amplifier and cut off baseband signal; Judge IQ signal imbalance according to the radiofrequency signal power that the radiofrequency signal power amplifier detects, then form module output IQ calibration command to radiofrequency signal;
Radiofrequency signal forms module, is used for according to the initial configuration of control circuit the radiofrequency signal that the analog I signal of giving tacit consent to is modulated into correspondence being exported to the radiofrequency signal power amplifier; Adjust the analog I signal according to the IQ calibration command;
The radiofrequency signal power amplifier is used for the input radio frequency signal power that detects is exported to control circuit.
Control circuit obtains the local oscillator interference signal by radiofrequency signal power, and relatively with the amplitude of the amplitude of this local oscillator interference signal and a reference signal, according to comparative result, do not meet the balance requirement if judge the analog I signal, then form module output IQ calibration command to radiofrequency signal; Meet the balance requirement if judge the analog I signal, then control is opened the radiofrequency signal power amplifier and is communicated with baseband signal.
Radiofrequency signal shown in Figure 1 forms module and further comprises DAC circuit, IQ modulation circuit, the amplification filtering circuit that connects successively, also comprises the local oscillator feedback circuit that is connected with control circuit, wherein:
The DAC circuit is used for the digital IQ conversion of signals of digital intermediate frequency circuit output is become the analog I signal and passes through the output of DAC register; IQ calibration command according to control circuit is adjusted the amplitude or the phase place of analog I signal;
The local oscillator feedback circuit is used under the control of control circuit to IQ modulation circuit output local oscillation signal;
The IQ modulation circuit is used under the effect of local oscillation signal, and intermediate frequency analog I signal is modulated into corresponding radiofrequency signal;
The amplification filtering circuit is used for radiofrequency signal is carried out filtering and processing and amplifying;
This amplification filtering circuit inside comprises filter and multistage small signal amplifier, attenuator etc.
The radiofrequency signal power amplifier will carry out exporting after the power amplification through the radiofrequency signal of filtering and processing and amplifying.
Control circuit is when powering on and/or when working frequency points changes, finish the initial configuration of analog I signal, local oscillator feedback circuit local oscillator frequency and the radiofrequency signal power amplifier of DAC register acquiescence according to the working frequency points of obtaining, the control figure intermediate-frequency circuit cuts off baseband signal, and the radiofrequency signal power amplifier is closed in control.Control circuit is the amplitude of the amplitude＞reference signal of local oscillator interference signal according to comparative result, judges that the analog I signal does not meet the balance requirement; Otherwise, be the amplitude of the amplitude≤reference signal of local oscillator interference signal according to comparative result, judge that the analog I signal meets the balance requirement.
The present invention is directed to above-mentioned DAC calibrating installation embodiment, correspondingly also provide time division duplex base station sender equipment to realize DAC calibration steps embodiment, its flow process triggers by the DAC calibrating installation when the base station powers on or change working frequency points and carries out as shown in Figure 2, comprises the steps:
201: obtain working frequency points, finish initial configuration, and close final stage power amplifier and cut off baseband signal;
At this, final stage power amplifier is the radiofrequency signal power amplifier in the DAC calibrating installation; Initial configuration comprises the configuration of IQ signal default value in the DAC register, the configuration of IQ modulation local oscillator frequency and the configuration of final stage power amplifier.
202: detect final stage power amplifier input radiofrequency signal power, obtain the local oscillator interference signal that causes because of IQ signal imbalance;
203: local oscillator interference signal amplitude of obtaining and the reference signal amplitude of presetting are compared;
204: judging whether comparative result meets the requirements, otherwise execution in step 205, is execution in step 206 then;
If comparative result is local oscillation signal amplitude＞reference signal amplitude, judge that then the analog I signal does not meet the balance requirement; If comparative result is local oscillation signal amplitude≤reference signal amplitude, judge that then the analog I signal does not meet the balance requirement.
205: adjust the DAC register value, return step 202 and carry out;
Judge that the analog I signal does not meet the balance requirement, then adjust the analog I signal value in the DAC register, return execution then and obtain local oscillator interference signal amplitude step, till the analog I signal meets the balance requirement according to the final stage power amplifier input IQ signal power that detects.
206: finish the IQ signal calibration and upgrade, open final stage power amplifier and be communicated with baseband signal, recover the base station operate as normal;
Judge that the analog I signal meets the balance requirement, then the analog I signal value through adjusting in the current DAC register of DAC circuit is write in the memory as the DAC Configuration Values that upgrades, the control figure intermediate-frequency circuit is communicated with baseband signal simultaneously, and control is opened final stage power amplifier and is communicated with baseband signal.
207: need judging whether the change working frequency points, is then to carry out to return step 201 execution, otherwise process ends.
The present invention is based on the automatic detection of IQ signal input power, finish the unbalanced calibration of I/Q by control circuit Control Software in the IQ signal calibration device, to adjust the IQ signal value of DAC register output, make the Simulation with I/Q signal amplitude and the phase place of output reach balance again.
In the past, the DAC calibration the during product of production base station was to write table with specific frequency when writing table, and in actual use, the influence that the amplitude of IQ signal and phase place are changed by frequency can.And method provided by the invention is a real time calibration, can eliminate above-mentioned influence as early as possible.The base station power on or course of normal operation in when needing to change working frequency points or frequency change, the free time before utilizing base station configuration to finish, carry out the DAC calibration again, can reach the purpose of real time calibration thus.
The present invention does not rely on building of instrument and platform, need not carry out the DAC calibration and write table when the product of production base station, has improved the efficient of IQ signal calibration in the production test greatly; And the automatic calibration of IQ signal does not take the normal operating time of base station, can satisfy the requirement of base station sender equipment real time calibration.
The explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, the content of this specification should not be construed as limitation of the present invention.
Claims (10)
1. the device of a base station sender equipment realization IQ signal calibration comprises that the control circuit, the radiofrequency signal that connect successively form module and radiofrequency signal power amplifier, wherein:
Control circuit also is connected with the radiofrequency signal power amplifier, be used for finishing initial configuration according to working frequency points, and control is closed the radiofrequency signal power amplifier and cut off baseband signal; Judge analog I signal imbalance according to the input radiofrequency signal power that the radiofrequency signal power amplifier detects, then form module output IQ calibration command to radiofrequency signal;
Radiofrequency signal forms module, is used for according to the described initial configuration of control circuit the radiofrequency signal that the analog I signal of giving tacit consent to is modulated into correspondence being exported to the radiofrequency signal power amplifier; Adjust described analog I signal according to described IQ calibration command;
The radiofrequency signal power amplifier is used for the input radiofrequency signal power that detects is exported to described control circuit.
2. according to the described device of claim 1, it is characterized in that,
Described control circuit obtains the local oscillator interference signal by described radiofrequency signal power, and relatively with the amplitude of the amplitude of described local oscillator interference signal and a reference signal, according to comparative result, if judge that described analog I signal does not meet the balance requirement, then form module and export described IQ calibration command to described radiofrequency signal; If judge that described analog I signal meets the balance requirement, then control is opened the radiofrequency signal power amplifier and is communicated with baseband signal.
3. according to the described device of claim 2, it is characterized in that radiofrequency signal forms module and comprises D/A converting circuit, IQ modulation circuit, the amplification filtering circuit that connects successively, also comprises the local oscillator feedback circuit that is connected with described control circuit, wherein:
D/A converting circuit is used for digital IQ conversion of signals is become the analog I signal, and exports by dac register; Described IQ calibration command according to described control circuit is adjusted the amplitude or the phase place of analog I signal;
The local oscillator feedback circuit is used under the control of described control circuit to IQ modulation circuit output local oscillation signal;
The IQ modulation circuit is used under the effect of described local oscillation signal, and described analog I signal is modulated into corresponding radiofrequency signal;
The amplification filtering circuit is used for described radiofrequency signal is carried out filtering and processing and amplifying;
Described radiofrequency signal power amplifier will carry out exporting after the power amplification through the radiofrequency signal of filtering and processing and amplifying.
4. according to the described device of claim 3, it is characterized in that,
Described control circuit is when powering on and/or when working frequency points changes, finish analog I signal, the local oscillator frequency of described local oscillator feedback circuit and the described initial configuration of described radiofrequency signal power amplifier that described dac register is given tacit consent to according to the working frequency points of obtaining, control is closed described radiofrequency signal power amplifier and is cut off described baseband signal.
5. according to the described device of claim 4, it is characterized in that,
Described control circuit is the amplitude of the amplitude＞described reference signal of described local oscillator interference signal according to comparative result, judges that described IQ signal does not meet the balance requirement; According to comparative result is the amplitude of the amplitude≤described reference signal of described local oscillator interference signal, judges that described IQ signal meets the balance requirement.
6. one kind is used device as claimed in claim 1 to realize the method for IQ signal calibration in the sender equipment of base station, comprising:
Described base station sender equipment is finished initial configuration according to the working frequency points of obtaining when powering on or change working frequency points, and closes the final stage power amplifier of radiofrequency signal and cut off baseband signal;
The analog I signal of acquiescence is modulated into the radiofrequency signal of correspondence according to described initial configuration;
Judge analog I signal imbalance according to the radiofrequency signal power that detects from described final stage power amplifier input, then adjust this analog I signal.
7. in accordance with the method for claim 6, it is characterized in that,
Described base station sender equipment is finished initial configuration according to the working frequency points of obtaining, and comprises the local oscillator frequency that analog I signal, the described analog I signal of modulation of logarithmic mode translation register acquiescence is required and the configuration of described radiofrequency signal power amplifier.
8. in accordance with the method for claim 7, it is characterized in that, judge analog I signal imbalance, then adjust this analog I signal, specifically comprise according to the radiofrequency signal power that detects from described final stage power amplifier input:
Obtain the local oscillator interference signal by the described radiofrequency signal power that detects, and the amplitude of described local oscillator interference signal and the amplitude of a reference signal are compared;
According to comparative result is the amplitude of the amplitude＞described reference signal of described local oscillator interference signal, judges that described analog I signal does not meet the balance requirement, then adjusts the amplitude and the phase place of described analog I signal.
9. in accordance with the method for claim 8, it is characterized in that, according to comparative result is the amplitude of the amplitude≤described reference signal of described local oscillator interference signal, judge that described analog I signal meets the balance requirement, then the analog I signal through adjusting in the current dac register is write in the memory as the digital-to-analogue conversion Configuration Values that upgrades, control is opened described final stage power amplifier and is communicated with baseband signal.
10. in accordance with the method for claim 9, it is characterized in that, after opening described final stage power amplifier and being communicated with baseband signal, also comprise:
To become the analog I signal by the digital IQ conversion of signals of described baseband signal conversion, and export by dac register;
Under the effect of local oscillation signal, described analog I signal is modulated into corresponding radiofrequency signal, and exports after filter amplifying processing and the power amplification carrying out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010589131.XA CN102025666B (en) | 2010-12-15 | 2010-12-15 | Method and device for realizing IQ signal correction in base station transmitter equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010589131.XA CN102025666B (en) | 2010-12-15 | 2010-12-15 | Method and device for realizing IQ signal correction in base station transmitter equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102025666A true CN102025666A (en) | 2011-04-20 |
| CN102025666B CN102025666B (en) | 2015-06-03 |
Family
ID=43866536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010589131.XA Expired - Fee Related CN102025666B (en) | 2010-12-15 | 2010-12-15 | Method and device for realizing IQ signal correction in base station transmitter equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102025666B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710268A (en) * | 2012-05-31 | 2012-10-03 | 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 |
| CN107547458A (en) * | 2016-06-28 | 2018-01-05 | 中兴通讯股份有限公司 | Mirror image suppresses method to set up, device and the Remote Radio Unit of parameter in IQ modulation |
| CN108259404A (en) * | 2018-01-12 | 2018-07-06 | 深圳锐越微技术有限公司 | Signal calibration method, device and the equipment generated based on IQ two-way imbalance |
| CN111510406A (en) * | 2020-06-03 | 2020-08-07 | 上海创远仪器技术股份有限公司 | Circuit structure and method for realizing broadband IQ modulation real-time predistortion calibration |
| CN112564628A (en) * | 2020-12-08 | 2021-03-26 | 东南大学 | Modulator with wide frequency band and high intrinsic vibration suppression degree |
| CN112583425A (en) * | 2019-09-30 | 2021-03-30 | 武汉杰开科技有限公司 | Detection regulating circuit and transmitter |
Citations (2)
| 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 |
-
2010
- 2010-12-15 CN CN201010589131.XA patent/CN102025666B/en not_active Expired - Fee Related
Patent Citations (2)
| 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 |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710268A (en) * | 2012-05-31 | 2012-10-03 | 澜起科技（上海）有限公司 | Low/intermediate-frequency receiver |
| 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 |
| CN107547458A (en) * | 2016-06-28 | 2018-01-05 | 中兴通讯股份有限公司 | Mirror image suppresses method to set up, device and the Remote Radio Unit of parameter in IQ modulation |
| 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 |
| WO2019137254A1 (en) * | 2018-01-12 | 2019-07-18 | 深圳锐越微技术有限公司 | Signal calibration method, apparatus and device generated based on imbalance of i and q paths |
| CN108259404A (en) * | 2018-01-12 | 2018-07-06 | 深圳锐越微技术有限公司 | Signal calibration method, device and the equipment generated based on IQ two-way imbalance |
| US11082082B2 (en) | 2018-01-12 | 2021-08-03 | Radiawave Technologies Co., Ltd. | Signal calibration method, and device generated based on imbalance of I path and Q path, and storage medium |
| CN112583425A (en) * | 2019-09-30 | 2021-03-30 | 武汉杰开科技有限公司 | Detection regulating circuit and transmitter |
| CN112583425B (en) * | 2019-09-30 | 2022-07-15 | 武汉杰开科技有限公司 | Detection regulating circuit and transmitter |
| CN111510406A (en) * | 2020-06-03 | 2020-08-07 | 上海创远仪器技术股份有限公司 | Circuit structure and method for realizing broadband IQ modulation real-time predistortion calibration |
| CN112564628A (en) * | 2020-12-08 | 2021-03-26 | 东南大学 | Modulator with wide frequency band and high intrinsic vibration suppression degree |
| CN112564628B (en) * | 2020-12-08 | 2023-08-08 | 东南大学 | Modulator with wide frequency band high local oscillation inhibition degree |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102025666B (en) | 2015-06-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3032738B1 (en) | Method and apparatus for correcting inconvenient power amplifier load characteristics in an envelope tracking based system | |
| CN102025666A (en) | Method and device for realizing IQ signal correction in base station transmitter equipment | |
| JP4951238B2 (en) | Polar coordinate modulation transmission apparatus, adaptive distortion compensation processing system, polar modulation transmission method, and adaptive distortion compensation processing method | |
| EP2206238B1 (en) | Dual band radio frequency transmitter | |
| US7792214B2 (en) | Polar modulation transmitter circuit and communications device | |
| CN102299878B (en) | Method and device for realizing multi-band digital predistortion (DPD) | |
| JP2012509033A (en) | RF transceiver IC with internal loopback conductor for IP2 self-test | |
| CN110460342B (en) | Gain compensation method | |
| US8600305B2 (en) | Method and system for compensating for estimated distortion in a transmitter by utilizing a digital predistortion scheme with a single feedback mixer | |
| KR20060028766A (en) | Method and system for suppressing carrier leakage | |
| CN101730210B (en) | Method and device for calibrating downlink radio frequency | |
| CN104301047A (en) | Power self-calibration device and method of multi-mode multi-frequency multi-channel system | |
| US8948700B2 (en) | Method and system for compensating for distortion in a transmitter by utilizing a digital predistortion scheme with a feedback mixer configuration | |
| EP2686965B1 (en) | Compensation of a transmitter distortion | |
| CN103685109A (en) | Broadband digital pre-distortion multicarrier power amplification system, and power-amplification gain equalization device and method thereof | |
| KR20130092773A (en) | Apparatus and method for supporting calibration for radio frequency circuit in communication device | |
| US7848450B2 (en) | Methods and apparatus to pre-compensate for I/Q distortion in quadrature transmitters | |
| WO2021047504A1 (en) | Fiber-optic repeater and passive intermodulation signal detection method and system thereof | |
| CN111313919B (en) | Multifunctional receiver | |
| CN112787675B (en) | Method for improving transmitter performance, storage medium and communication equipment | |
| KR20140076150A (en) | Apparatus and method for dc offset calibration in signal transmission apparatus | |
| CN117526987A (en) | Remote radio unit transformation method, remote radio unit and storage medium | |
| GB2464962A (en) | Transmitter phase correction during intervals of low signal power | |
| CN104516279A (en) | Control circuit and method of PCI-E (peripheral component interconnect express) device | |
| MXPA00007176A (en) | Power amplifying circuit with load adjust for control of adjacent and alternate channel power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20191215 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |