CN102916694A - Conditioning method and device for local oscillator signals - Google Patents
Conditioning method and device for local oscillator signals Download PDFInfo
- Publication number
- CN102916694A CN102916694A CN2012104232526A CN201210423252A CN102916694A CN 102916694 A CN102916694 A CN 102916694A CN 2012104232526 A CN2012104232526 A CN 2012104232526A CN 201210423252 A CN201210423252 A CN 201210423252A CN 102916694 A CN102916694 A CN 102916694A
- Authority
- CN
- China
- Prior art keywords
- frequency
- local oscillation
- zero
- signal
- oscillation signal
- 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
Landscapes
- Transmitters (AREA)
Abstract
The invention discloses a conditioning method and device for local oscillator signals, and relates to communication technology. After a local oscillator signal subjected to frequency conversion by a feedback local oscillator is received, the local oscillator signal is sampled and shifted to zero frequency; at the moment, even if a frequency deviation exists, a local oscillator leakage is near the zero frequency, so within the searching range taking the preset zero frequency as a center, the signal power maximum is determined, the maximum is a local oscillator leakage value; and then, according to the signal power maximum, the local oscillator signal is conditioned, and the accuracy in conditioning the local oscillator signal can be improved.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of local oscillation signal control method and device.
Background technology
At present, the downstream signal emitter as shown in Figure 1, after local oscillation signal sends, by DSP(Digital Signal Processor, digital signal processor) observes the size of local oscillator leakage by the transmitting feedback loop, and constantly regulate DC-OFFSET(direct current offset value among the DAC) parameter, that is: from the DSP parameter, read the size of local oscillator, and judge whether the local oscillator size meets the requirements, if meet the requirements then stop the correction of DC-OFFSET, otherwise till being adapted to the local oscillator size always and meeting the requirements.
By the adjusting of DC-OFFSET parameter, can compensate local oscillator leakage, obtain required local oscillation signal.
For so that the local oscillation signal of emission and the aliasing not of the feedback local oscillator in the feedback control loop, when carrying out the adjusting of DC-OFFSET parameter, the local oscillation signal (DL_LO) of design is different with the frequency of feedback local oscillator (FB_LO), for example, can design DL_LO downstream signal local oscillator frequency is 2442.24MHz, feedback local oscillator FB_LO then is configured in 2472.96MHz when carrying out the local oscillator calibration, so that descending local oscillation signal drops on flo=30.72MHz through after the frequency conversion.
The direct current signal rf_tx (t) that nonideal quadrature demodulator sends out:
rf_tx(t)＝Idc(t)cos(2πf
DL_LOt)-Qdc(t)sin(2πf
DL_LOt)
The local oscillation signal watt level of DL_LO output generally is-10dBm, chip is exported the isolation of local oscillator generally greater than 40dBc to local oscillation signal, so the direct current of local oscillation signal output has been isolated substantially, therefore the direct current signal of the output of quadrature modulator all is DAC(Digital Analog Converter basically, digital to analog converter) the middle direct current leakage of exporting.
From power amplifier be coupled the signal of returning by quadrature demodulation after, form I road and Q road signal, respectively after the amplification filtering by ADC(Analog Digital Converter, digital to analog converter), the DSP processing module is being received feedback signal I/Q: if f
DL_LO=f
FB_LO, the center frequency point of i/q signal just all is shifted to zero-frequency like this, and at this moment, local oscillator leakage and direct current leakage all are in the position, can not calculate local oscillator leakage, also just are difficult to local oscillation signal is regulated.If f
FB_LO=f
DL_LO+ f
Diff_fb_dl, and f is set
Diff_fb_dlBe not equal to null value, can determine local oscillator leakage so.
f
Diff_fb_dlValue can be first that Qwest district of feedback sample signal, and the sampling rate of feedback ADC is the integral multiple of this frequency, for example f
Diff_fb_dl=30.72MHz, perhaps f
Diff_fb_dl=92.16MHz.
At this moment, f
Diff_fb_dlThe position is local oscillator leakage, and the signal with this frequency is modulated to zero-frequency usually, then calculates the signal power of zero-frequency, can determine the size of local oscillator leakage.
But this determines method, and there are the following problems:
Because the method is at definite f
Diff_fb_dlCalculate under the prerequisite of=30.72MHz, if f
Diff_fb_dlFrequency skew appears, after then moving, local oscillator leakage not necessarily is positioned at the zero-frequency position accurately, at this moment, if with zero frequency signal as local oscillator leakage, the local oscillator leakage that then calculates is not accurate enough.
Concrete, at design DL_LO downstream signal local oscillator frequency 2442.24MHz, feedback local oscillator FB_LO should be configured in 2472.96MHz when carrying out the local oscillator calibration, in theory so that descending local oscillator drops on flo=30.72MHz through after the frequency conversion;
But in fact in the test frequency deviation problem has appearred, link DL_LO signal frequency point 2442.24MHZ becomes and is 2442.248MHz, the actual frequency of FB LO 2472.96MHZ is 2472.962MHz, behind modulator, differ 6KHz with target frequency 30.72MHz, sometimes frequency shift (FS) meeting is larger, for example local frequency should be 30.72MHZ, and the signal of test sometimes has been displaced to 30.44mhz, has been offset general 300KHZ.
At present, the mode that addresses this problem is: reduce sampled point and calculate local oscillator leakage, because after reducing sampled point, the corresponding increase of the frequency range of each sampled point representative, the zero-frequency sampled point namely may cover f
Diff_fb_dlFrequency shift (FS).At that time, as shown in Figure 2, usually occur easily around the local oscillation signal spuious, if after modulation, reduce the sampled point number, then can be with this spuious calculating in the local oscillator leakage, as shown in Figure 3 so that the local oscillator leakage that calculates is not accurate enough.
Therefore, can not calculate at present direction and the size of local oscillator skew, when local oscillator has certain deviation, can't accurately calculate local oscillator leakage, thereby can not regulate local oscillation signal according to local oscillator leakage accurately.
Summary of the invention
The embodiment of the invention provides a kind of local oscillation signal control method and device, the accuracy of regulating to improve local oscillation signal.
A kind of local oscillation signal control method comprises:
Reception is by feeding back the local oscillation signal after local oscillator is carried out frequency conversion;
Local oscillation signal after the described frequency conversion is sampled, and it is moved zero-frequency;
Determine the signal power maximum in the predefined hunting zone centered by zero-frequency point;
According to described signal power maximum local oscillation signal is regulated.
A kind of local oscillation signal adjusting device comprises:
Receiving element is used for receiving by feeding back the local oscillation signal after local oscillator is carried out frequency conversion;
The sample modulation unit is used for the local oscillation signal after the described frequency conversion is sampled, and it is moved zero-frequency;
Determining unit is for the signal power maximum of determining predefined hunting zone centered by zero-frequency point;
Regulon is used for according to described signal power maximum local oscillation signal being regulated.
The embodiment of the invention provides a kind of local oscillation signal control method and device, receiving by after feeding back the local oscillation signal after local oscillator is carried out frequency conversion, this local oscillation signal is sampled, and this local oscillation signal moved zero-frequency, at this moment, even there is frequency shift (FS), local oscillator leakage also should be near zero-frequency, so in predefined hunting zone centered by zero-frequency point, determine the signal power maximum, this maximum just should be the local oscillator leakage value, carries out adjusting to local oscillation signal according to this signal power maximum again, can improve the accuracy that local oscillation signal is regulated.
Description of drawings
Fig. 1 is that local oscillation signal and feedback signal are determined principle schematic in the prior art;
Fig. 2 is the signal spectrum schematic diagram after the frequency conversion in the prior art;
Fig. 3 be in the prior art frequency conversion and move after the signal spectrum schematic diagram;
The local oscillation signal control method flow chart that Fig. 4 provides for the embodiment of the invention;
Signal spectrum schematic diagram after the frequency conversion that Fig. 5 provides for the embodiment of the invention;
The frequency conversion that Fig. 6 provides for the embodiment of the invention and move after the signal spectrum schematic diagram;
The local oscillation signal adjusting device structural representation that Fig. 7 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of local oscillation signal control method and device, receiving by after feeding back the local oscillation signal after local oscillator is carried out frequency conversion, this local oscillation signal is sampled, and this local oscillation signal moved zero-frequency, at this moment, even there is frequency shift (FS), local oscillator leakage also should be near zero-frequency, so in predefined hunting zone centered by zero-frequency point, determine the signal power maximum, this maximum just should be the local oscillator leakage value, carries out adjusting to local oscillation signal according to this signal power maximum again, can improve the accuracy that local oscillation signal is regulated.
As shown in Figure 4, the local oscillation signal control method that provides of the embodiment of the invention comprises:
Step S401, reception are by feeding back the local oscillation signal after local oscillator is carried out frequency conversion;
Step S402, the local oscillation signal after the frequency conversion is sampled, and it is moved zero-frequency;
Step S403, determine the signal power maximum in the predefined hunting zone centered by zero-frequency point;
Step S404, according to the signal power maximum local oscillation signal is regulated.
After local oscillation signal is moved zero-frequency, be not directly with the signal power of zero-frequency point as local oscillator leakage, but in the hunting zone centered by zero-frequency point, determine the signal power maximum, this signal power maximum is exactly local oscillator leakage value accurately like this, carry out the adjusting of local oscillation signal by this value, can effectively improve the adjusting accuracy of local oscillation signal.
This local oscillation signal control method can be realized by the DSP in the schematic diagram as shown in Figure 1, also can realize by other device with digital signal processing function.
Concrete, in step S403, determine the signal power maximum in the predefined hunting zone centered by zero-frequency point, specifically comprise:
The amplitude-frequency characteristic of the local oscillation signal after determining to move;
The precision of the full scale of the local oscillation signal after determining to move;
According to the precision of the full scale of the local oscillation signal after moving, determine the amplitude-frequency maximum of the local oscillation signal in the hunting zone;
Determine the signal power maximum according to the amplitude-frequency maximum.
The sampling rate (sample rate) of calculating local oscillator signal magnitude and ADC is relevant with the sampling number (point num) of DSP storage.The frequency size of each sampled point representative is:
Wherein, sample_rate is sampling rate, and sample_num is sampling number.
The local frequency point of the feedback signal that the DSP sampling obtains is:
flo＝DL_LO-FB_LO
Wherein DL_LO is the local oscillation signal frequency, and FB_LO is feedback frequency signal.
The bit wide of sampled signal is: bits=16-1=15.
Hunting zone centered by zero-frequency point then as:
lo_fre_range＝[-fre_point*np,fre_point*np]
Wherein, np is predefined positive integer, and this numerical value is larger, and the hunting zone is then larger, at this moment easier accurately definite local oscillator leakage value, computation complexity is higher, and the operational capability of related device is had relatively high expectations, this numerical value is less, and the hunting zone is then corresponding less, and it is better generally to set np=15.Those skilled in the art can arrange the np value flexibly according to actual conditions.
After sampling, at first the local oscillation signal shifting frequency to zero point:
fb＝fb*exp(-j*2*π*f
diff_fb_dl/sample_rate*[1:sample_num])
Wherein, fb is local oscillation signal, f
Diff_fb_dlThe theoretical difference of local oscillation signal and feedback signal, for example, f
Diff_fb_dl=30.72MHz, perhaps f
Diff_fb_dl=92.16MHz,
Exp(x)=e
x
Signal after moving is done the FFT computing, then gets its amplitude-frequency characteristic:
fftfb＝|fft(fb)|；
Then frequency-region signal is got the precision of its full scale:
Local oscillation signal is got maximum in frequency separation
[sig_lo，pos_lo]＝max([fftdbfs(1:np)])
Wherein, sig_lo is the maximum signal amplitudes value that obtains, and pos_lo is Frequency point corresponding to this maximum signal amplitudes value.
Just can obtain the watt level of the local oscillation signal of down link this moment:
DL_LO_dBFS＝20*log
10(sig_lo)
Can also effectively obtain simultaneously the frequency shift (FS) of local oscillator.
For example, as shown in Figure 5, a sampling number point_num=8192 sampled point of sample rate=245.76MHz and DSP storage, the Frequency point of local oscillator is flo=-30.72MHz, the signal of zero frequency point is the direct current leakage of feedback path.
After carrying out frequency translation, local oscillation signal is moved the zero-frequency point, the spectrogram after moving can be determined DL_LO_dBFS=-22.6dBFS, pos_lo=10 by said method as shown in Figure 6.
Therefore can also effectively calculate the frequency size of local oscillator skew this moment:
When frequency shift (FS) can be taked corresponding measure to a certain degree the time, continue skew to prevent frequency, cause frequency shift (FS) excessive.For example, institute's Adopts measure can be the PLL(Phase Locked Loop that resets, phase-locked loop) or to OM(Operation and Maintenance, operational administrative) alarm, certainly, also can take other measure according to actual conditions are corresponding.
As seen, in the local oscillation signal control method that the embodiment of the invention provides, determine the signal power maximum in the predefined hunting zone centered by zero-frequency point after, also comprise:
Determine the Frequency point that the signal power maximum is corresponding.
In the distance of Frequency point corresponding to signal power maximum and zero-frequency point during greater than set point, can reset or carry out alarm.
In step S404, when according to the signal power maximum local oscillation signal being regulated, can adjust the direct current offset value that is used for the compensation local oscillator leakage according to the signal power maximum, thereby realize the compensation to local oscillator leakage.
Further, after the local oscillation signal after the frequency conversion is sampled, before it is moved zero-frequency, the signal that be positioned at zero-frequency point this moment is the direct current leakage of feedback signal, and as shown in Figure 5, the signal of the zero-frequency point among this frequency power figure is the direct current leakage of feedback signal, the local oscillation signal control method that provides by the embodiment of the invention, can further determine the zero frequency signal performance number of zero-frequency point, and according to the zero frequency signal performance number, direct current leakage be regulated.
The direct current leakage of the feedback signal among Fig. 5 is:
The embodiment of the invention is also corresponding to provide a kind of local oscillation signal adjusting device, and as shown in Figure 7, this device comprises:
Receiving element 701 is used for receiving by feeding back the local oscillation signal after local oscillator is carried out frequency conversion;
Determining unit 703 is for the signal power maximum of determining predefined hunting zone centered by zero-frequency point;
Wherein, determining unit 703 specifically is used for:
The amplitude-frequency characteristic of the local oscillation signal after determining to move;
The precision of the full scale of the local oscillation signal after determining to move;
According to the precision of the full scale of the local oscillation signal after moving, determine the amplitude-frequency maximum of the local oscillation signal in the hunting zone;
Determine the signal power maximum according to the amplitude-frequency maximum.
Determining unit 703 also is used for:
After the signal power maximum in the predefined hunting zone centered by zero-frequency point, determine the Frequency point that the signal power maximum is corresponding.
At this moment, determining unit 703 also is used for:
In the distance of Frequency point corresponding to signal power maximum and zero-frequency point during greater than set point, reset or carry out alarm.
According to the signal power maximum, adjust the direct current offset value that is used for the compensation local oscillator leakage.
Determining unit 703 also is used for:
After local oscillation signal after the sample modulation unit is to frequency conversion is sampled, before it is moved zero-frequency, determine the zero frequency signal performance number of zero-frequency point;
At this moment, regulon 704 also is used for:
According to the zero frequency signal performance number, direct current leakage is regulated.
The embodiment of the invention provides a kind of local oscillation signal control method and device, receiving by after feeding back the local oscillation signal after local oscillator is carried out frequency conversion, this local oscillation signal is sampled, and this local oscillation signal moved zero-frequency, at this moment, even there is frequency shift (FS), local oscillator leakage also should be near zero-frequency, so in predefined hunting zone centered by zero-frequency point, determine the signal power maximum, this maximum just should be the local oscillator leakage value, carries out adjusting to local oscillation signal according to this signal power maximum again, can improve the accuracy that local oscillation signal is regulated.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, complete implement software example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form of the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device producing a machine, so that the instruction of carrying out by the processor of computer or other programmable data processing device produces the device of the function that is used for being implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, so that the instruction that is stored in this computer-readable memory produces the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, so that carry out the sequence of operations step producing computer implemented processing at computer or other programmable devices, thereby be provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame in the instruction that computer or other programmable devices are carried out.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative concept of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. a local oscillation signal control method is characterized in that, comprising:
Reception is by feeding back the local oscillation signal after local oscillator is carried out frequency conversion;
Local oscillation signal after the described frequency conversion is sampled, and it is moved zero-frequency;
Determine the signal power maximum in the predefined hunting zone centered by zero-frequency point;
According to described signal power maximum local oscillation signal is regulated.
2. the method for claim 1 is characterized in that, the described signal power maximum of determining in the predefined hunting zone centered by zero-frequency point specifically comprises:
The amplitude-frequency characteristic of the local oscillation signal after determining to move;
The precision of the full scale of the local oscillation signal after determining to move;
According to the precision of the full scale of the local oscillation signal after described the moving, determine the amplitude-frequency maximum of the local oscillation signal in the hunting zone;
Determine described signal power maximum according to described amplitude-frequency maximum.
3. the method for claim 1 is characterized in that, determine the signal power maximum in the predefined hunting zone centered by zero-frequency point after, also comprise:
Determine Frequency point corresponding to described signal power maximum.
4. method as claimed in claim 3 is characterized in that, also comprises:
In the distance of Frequency point corresponding to described signal power maximum and zero-frequency point during greater than set point, reset or carry out alarm.
5. the method for claim 1 is characterized in that, describedly according to described signal power maximum local oscillation signal is regulated, and is specially:
According to described signal power maximum, adjust the direct current offset value that is used for the compensation local oscillator leakage.
6. the method for claim 1 is characterized in that, after the local oscillation signal after the described frequency conversion is sampled, before it is moved zero-frequency, also comprises:
Determine the zero frequency signal performance number of zero-frequency point;
According to described zero frequency signal performance number, direct current leakage is regulated.
7. a local oscillation signal adjusting device is characterized in that, comprising:
Receiving element is used for receiving by feeding back the local oscillation signal after local oscillator is carried out frequency conversion;
The sample modulation unit is used for the local oscillation signal after the described frequency conversion is sampled, and it is moved zero-frequency;
Determining unit is for the signal power maximum of determining predefined hunting zone centered by zero-frequency point;
Regulon is used for according to described signal power maximum local oscillation signal being regulated.
8. device as claimed in claim 7 is characterized in that, described determining unit specifically is used for:
The amplitude-frequency characteristic of the local oscillation signal after determining to move;
The precision of the full scale of the local oscillation signal after determining to move;
According to the precision of the full scale of the local oscillation signal after described the moving, determine the amplitude-frequency maximum of the local oscillation signal in the hunting zone;
Determine described signal power maximum according to described amplitude-frequency maximum.
9. device as claimed in claim 8 is characterized in that, described determining unit also is used for:
After the signal power maximum in the predefined hunting zone centered by zero-frequency point, determine Frequency point corresponding to described signal power maximum.
10. device as claimed in claim 9 is characterized in that, described determining unit also is used for:
In the distance of Frequency point corresponding to described signal power maximum and zero-frequency point during greater than set point, reset or carry out alarm.
11. device as claimed in claim 7 is characterized in that, described regulon specifically is used for:
According to described signal power maximum, adjust the direct current offset value that is used for the compensation local oscillator leakage.
12. device as claimed in claim 7 is characterized in that, described determining unit also is used for:
After local oscillation signal after described sample modulation unit is to described frequency conversion is sampled, before it is moved zero-frequency, determine the zero frequency signal performance number of zero-frequency point;
Described regulon also is used for:
According to described zero frequency signal performance number, direct current leakage is regulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210423252.6A CN102916694B (en) | 2012-10-29 | 2012-10-29 | A kind of local oscillation signal control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210423252.6A CN102916694B (en) | 2012-10-29 | 2012-10-29 | A kind of local oscillation signal control method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102916694A true CN102916694A (en) | 2013-02-06 |
| CN102916694B CN102916694B (en) | 2016-08-24 |
Family
ID=47614947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210423252.6A Active CN102916694B (en) | 2012-10-29 | 2012-10-29 | A kind of local oscillation signal control method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102916694B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104486272A (en) * | 2014-12-08 | 2015-04-01 | 大唐移动通信设备有限公司 | Feedback signal correcting method and device |
| CN104568060A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Pulsing radar level meter, adjusting method of local vibration power of pulsing radar level meter, and controller |
| CN105116386A (en) * | 2015-09-11 | 2015-12-02 | 上海广电通信技术有限公司 | Adaptive maximum intermediate frequency energy tracking radar receiving system |
| CN107395537A (en) * | 2017-08-04 | 2017-11-24 | 成都九洲迪飞科技有限责任公司 | A kind of IQ DC adjustment method and devices of suppression LO leakages |
| CN107749755A (en) * | 2017-11-10 | 2018-03-02 | 中国电子科技集团公司第四十研究所 | It is a kind of to improve the frequency scanning control method for receiving the spuious index of unit frequency |
| CN112804170A (en) * | 2019-11-14 | 2021-05-14 | 大唐移动通信设备有限公司 | DC offset processing method and receiver |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420236A (en) * | 2007-10-24 | 2009-04-29 | 松下电器产业株式会社 | Local oscillation leakage detection and elimination apparatus and method |
| CN102065041A (en) * | 2010-11-18 | 2011-05-18 | 中兴通讯股份有限公司 | Method, device and system for inhibiting local oscillator leakage |
| CN102739584A (en) * | 2011-04-02 | 2012-10-17 | 鼎桥通信技术有限公司 | Method and device for inhibiting local oscillator leakage |
-
2012
- 2012-10-29 CN CN201210423252.6A patent/CN102916694B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420236A (en) * | 2007-10-24 | 2009-04-29 | 松下电器产业株式会社 | Local oscillation leakage detection and elimination apparatus and method |
| CN102065041A (en) * | 2010-11-18 | 2011-05-18 | 中兴通讯股份有限公司 | Method, device and system for inhibiting local oscillator leakage |
| CN102739584A (en) * | 2011-04-02 | 2012-10-17 | 鼎桥通信技术有限公司 | Method and device for inhibiting local oscillator leakage |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104486272A (en) * | 2014-12-08 | 2015-04-01 | 大唐移动通信设备有限公司 | Feedback signal correcting method and device |
| CN104568060A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Pulsing radar level meter, adjusting method of local vibration power of pulsing radar level meter, and controller |
| CN104568060B (en) * | 2014-12-31 | 2018-01-16 | 重庆川仪自动化股份有限公司 | The adjusting method and controller of a kind of pulse radar material level meter and its local oscillation power |
| CN105116386A (en) * | 2015-09-11 | 2015-12-02 | 上海广电通信技术有限公司 | Adaptive maximum intermediate frequency energy tracking radar receiving system |
| CN105116386B (en) * | 2015-09-11 | 2017-05-24 | 上海广电通信技术有限公司 | Adaptive maximum intermediate frequency energy tracking radar receiving system |
| CN107395537A (en) * | 2017-08-04 | 2017-11-24 | 成都九洲迪飞科技有限责任公司 | A kind of IQ DC adjustment method and devices of suppression LO leakages |
| CN107749755A (en) * | 2017-11-10 | 2018-03-02 | 中国电子科技集团公司第四十研究所 | It is a kind of to improve the frequency scanning control method for receiving the spuious index of unit frequency |
| CN107749755B (en) * | 2017-11-10 | 2020-11-03 | 中国电子科技集团公司第四十一研究所 | Frequency scanning control method for improving frequency spurious index of receiver |
| CN112804170A (en) * | 2019-11-14 | 2021-05-14 | 大唐移动通信设备有限公司 | DC offset processing method and receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102916694B (en) | 2016-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102916694A (en) | Conditioning method and device for local oscillator signals | |
| CN102325058B (en) | Frequency change system group delay test method | |
| CN1121092C (en) | Method and arrangement for correcting phase error in linearization loop of power amplifier | |
| CN103444076B (en) | For the group delay calibration steps of power amplifier envelope-tracking | |
| CN109196375B (en) | FM-CW radar and method for generating FM-CW signal | |
| CN101868053B (en) | Correction method and device for zero intermediate frequency signal | |
| CN108667466B (en) | A kind of multichannel survey phase system and method based on RF transceiver chip | |
| CN103166670B (en) | Radio frequency transceiver of Beidou satellite navigation and positioning system | |
| KR20160074526A (en) | Frequency modulated radar level gauging | |
| CN102801434B (en) | Satellite-borne measurement and control receiver | |
| CN102752038B (en) | Satellite responder | |
| CN103166635A (en) | Method and faculty to measure and compensate dco frequency distortions using a dpll | |
| CN102243308A (en) | Single-channel radiofrequency receiver and frequency planning method thereof | |
| CN107425858A (en) | For second order intercept point（IP2）The method and apparatus of calibration | |
| US11729040B2 (en) | Coarse and fine compensation for frequency error | |
| CN102368690A (en) | Micro-nano satellite measurement and control digit midfrequency and baseband processing method and apparatus thereof | |
| CN115113245A (en) | Positioning device and positioning system based on low-power-consumption Bluetooth | |
| CN105222919A (en) | A kind of passive wireless temperature sensor based on surface acoustic wave | |
| CN203166873U (en) | Atom frequency scale | |
| CN104393912B (en) | A kind of ground-to-air wideband communication system and its method for unmanned plane | |
| CN101216526B (en) | Feedforward loop circuit synchronous detection device | |
| CN204465459U (en) | A kind of frequency changer circuit and receiver board | |
| CN105407528A (en) | Wireless ranging communication module based on measurement of asynchronous response time | |
| RU140340U1 (en) | HF RADIO TRANSMISSION SYSTEM | |
| CN205157648U (en) | Non -blind area digital phasemeter device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20151021 Address after: 200233 Shanghai, Xuhui District Jiang Road, No. 41, building 333 Applicant after: Datang Mobile Communication Equipment Co., Ltd., Shanghai Applicant after: Datang Mobile Communication Equipment Co., Ltd. Address before: 100083 Haidian District, Xueyuan Road, No. 29, Applicant before: Datang Mobile Communication Equipment Co., Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |