CN102664599A - Gain compensation method in band-cross measurement and device thereof - Google Patents
Gain compensation method in band-cross measurement and device thereof Download PDFInfo
- Publication number
- CN102664599A CN102664599A CN2012100975604A CN201210097560A CN102664599A CN 102664599 A CN102664599 A CN 102664599A CN 2012100975604 A CN2012100975604 A CN 2012100975604A CN 201210097560 A CN201210097560 A CN 201210097560A CN 102664599 A CN102664599 A CN 102664599A
- Authority
- CN
- China
- Prior art keywords
- frequency
- frequency band
- gain
- fiducial error
- band
- 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.)
- Pending
Links
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention is applicable to the communication field and provides a gain compensation method in band-cross measurement and a device thereof. The method comprises the following steps of: acquiring a reference error of a first frequency band in the band-cross measurement, wherein the reference error is a difference between an actual gain and a nominal gain of the first frequency band; calculating a gain compensation value of a second frequency band through the reference error of the first frequency band and a frequency compensation table, wherein the frequency compensation table comprises frequency compensation values between different frequency bands; adding a preset gain of the second frequency band and the gain compensation value of the second frequency band to obtain an actual gain of the second frequency band. According to the embodiment of the invention, in the band-cross measurement, through the reference error and fixed nominal gain configuration, the frequency of a pilot frequency point is compensated through inquiring the table, high cost caused by a high precision requirement of an apparatus when simulating a feedback compensation gain is avoided, switching gain reference tables corresponding to a plurality of bands is not needed, and a switching time of band-cross pilot frequency measurement and storage space are reduced.
Description
Technical field
The invention belongs to the communications field, relate in particular to a kind of gain compensating method and device of striding in the frequency band measurement.
Background technology
In the process that radiofrequency signal receives, with reference to figure 1 (radio frequency reception structure principle chart), through low noise amplifier (Low Noise Amplifier; LNA) after radiofrequency signal after the amplification and carrier signal are carried out mixing through frequency mixer (mixer), pass through RF Filter filtering, variable gain amplifier (Variable Gain Amplifier, VGA) amplification again; Through analog to digital converter (Analog to Digital Converter ADC) carries out being down-converted to base band (DBB) after the digital-to-analogue conversion, yet; At long evolving system (Long Term Evolution; LTE), in modulator-demodulator (Modem) or the USB data card terminals such as (USB stick), often need support and in a plurality of frequency bands (band), to work, but because the response of radio frequency analog device frequency is non-constant; The gain difference of radio-frequency devices is bigger in a plurality of band; Even in identical band, also there is gain error between each frequency, need to proofread and correct through gain compensation.
At present, adopt following mode mostly for the compensation of rf gain:
One, carries out gain compensation through analog domain, make the actual gain that comes into force reach the theoretical gain of expectation;
But the shortcoming of this mode is that (Variable Gain Amplifier VGA) need be more accurate, and adjustable required precision is higher, and (Radio Frequency, RF) device cost is very high for radio frequency for variable gain amplifier.
Two, measure or calculate the deviation of radio frequency and analogue device actual gain and nominal gain, in numeric field VGA compensate.
But the shortcoming of this mode is, generally can only in same band, compensate, if will in many band, compensate the time, need in each band, switch master meter, and is quite big to the demand of memory space, and switching time is very long.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of method of striding the gain compensation in the frequency band measurement, is intended to solve existing radiofrequency signal and receives in many bandwidth high to the VGA accuracy requirement, big to memory space requirements, that the time is long problem.
The embodiment of the invention is achieved in that a kind of gain compensating method of striding in the frequency band measurement, comprising:
When striding the frequency band measurement, obtain the fiducial error of first frequency band, said fiducial error is the actual gain of said first frequency band and the difference of nominal gain;
The gain compensation value that fiducial error and frequency compensation table through said first frequency band calculates second frequency band, said frequency compensation table comprises the frequency compensation value between different frequency bands;
The gain compensation value addition of the preset gain of said second frequency band and said second frequency band is obtained the actual gain of said second frequency band.
Another purpose of the embodiment of the invention is to provide a kind of gain compensation means of striding in the frequency band measurement, and said device comprises:
The fiducial error acquiring unit is used for when striding the frequency band measurement, obtaining the fiducial error of first frequency band, and said fiducial error is the actual gain of said first frequency band and the difference of nominal gain;
Computing unit; Be used for the gain compensation value that fiducial error and frequency compensation table through said first frequency band calculate second frequency band; And the gain compensation value addition of the preset nominal gain of said second frequency band and said second frequency band obtained the actual gain of said second frequency band, said frequency compensation table comprises the frequency compensation value between different frequency bands.
The embodiment of the invention is when striding the band measurement; Through fiducial error and fixedly nominal gain configuration and the pilot frequency point frequency is compensated through tabling look-up; When having avoided by the analog feedback compensating gain to the device high-precision requirement cause expensive; And need not to switch the corresponding gain reference table of a plurality of band, reduce the switching time and the memory space of striding the band different-frequency measure.
Description of drawings
Fig. 1 receives structure principle chart for radio frequency;
The realization flow figure that strides the gain compensating method in the frequency band measurement that Fig. 2 provides for first embodiment of the invention;
The realization flow figure that strides the gain compensating method in the frequency band measurement that Fig. 3 provides for second embodiment of the invention;
The realization flow figure that strides the gain compensating method in the frequency band measurement that Fig. 4 provides for third embodiment of the invention;
The structure chart of striding the gain compensation means in the frequency band measurement that Fig. 5 provides for one embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention has lowered cost through fiducial error and fixedly nominal gain configuration and the pilot frequency point frequency is compensated through tabling look-up, and reduces the switching time and the memory space of striding the band different-frequency measure.
Fig. 2 shows the realization flow of striding the gain compensating method in the frequency band measurement that first embodiment of the invention provides, and details are as follows:
In S101, when striding the frequency band measurement, obtain the fiducial error of first frequency band, said fiducial error is the actual gain of said first frequency band and the difference of nominal gain;
In embodiments of the present invention; The fiducial error of this first frequency band is under preset nominal gain G (i), (certainly, is not limited to the benchmark frequency based on the benchmark frequency; Also can be based on the arbitrary frequency among center frequency point or the band) under conditions such as preset temperature, preset pressure, measure the difference of actual gain and this nominal gain among each band; When preset nominal gain is n (n is the integer greater than 1, and i is smaller or equal to n), fiducial error be one group of difference: off (1), off (2) ..., off (n); If there be K band, then obtain the corresponding many groups fiducial error of K band successively.
In embodiments of the present invention; Can be divided into a plurality of gears according to the power of radiofrequency signal; And adopt respectively multiple multiplication factor nominal gain G (1), G (2) ..., G (n) is corresponding amplifies, for example the first nominal gain G (1) is set to 5db, the second nominal gain G (2) is set to 10db...; When radiofrequency signal is more weak, can select the bigger nominal gain of multiplication factor, when radiofrequency signal is strong, can select the less nominal gain of multiplication factor.
In S102, the gain compensation value that fiducial error and the frequency compensation table through first frequency band calculates second frequency band, this frequency compensation table comprises the frequency compensation value between different frequency bands;
In embodiments of the present invention; Can be through test generated frequency compensation meter; Be specially the frequency compensation value of in each band, obtaining the individual frequency of m (m for greater than 1 integer) respectively: f (1), f (2) ..., f (m); To K band test back generated frequency compensation meter, actual gain that this frequency compensation value is a plurality of frequencies and preset frequency are in the difference of the pre-conditioned actual gain that measures down successively; Also can the predeterminated frequency compensation meter.
Obtain the frequency compensation value of the corresponding frequency of measuring-signal through tabling look-up, and with the corresponding fiducial error value addition of this measuring-signal place band, obtain second frequency band gain compensation value.
In S103, the gain compensation value addition of the preset gain of second frequency band and second frequency band is obtained the actual gain of second frequency band.
In embodiments of the present invention, this measuring-signal is obtained actual gain through the gain compensation value addition of calculating preset theoretical nominal gain and above-mentioned second frequency band that obtains.
In embodiments of the present invention; When striding the band measurement; Through fiducial error and fixedly nominal gain configuration and the pilot frequency point frequency is compensated through tabling look-up; When having avoided by the analog feedback compensating gain to the device high-precision requirement cause expensive, and need not to switch the corresponding gain reference table of a plurality of band, reduce the switching time and the memory space of striding the band different-frequency measure.
Fig. 3 shows the realization flow of striding the gain compensating method in the frequency band measurement that second embodiment of the invention provides, and details are as follows:
In S201, striding before frequency band measures, obtain a plurality of fiducial error values of a plurality of frequency bands respectively, generating the fiducial error table, the fiducial error of each frequency band be to preset actual gain and the difference of nominal gain of frequency under pre-conditioned in each frequency band;
In S202, when striding the frequency band measurement, obtain the fiducial error of first frequency band according to the fiducial error table;
As one embodiment of the invention; This nominal gain is one or more; When the nominal gain of each frequency band when being a plurality of; Each frequency band has a plurality of fiducial errors, and each fiducial error is respectively the preset actual gain of frequency under pre-conditioned and the difference of each fiducial error in a plurality of fiducial error.
In S203, the gain compensation value that fiducial error and the frequency compensation table through first frequency band calculates second frequency band, this frequency compensation table comprises the frequency compensation value between different frequency bands;
In S204, the gain compensation value addition of the preset gain of second frequency band and second frequency band is obtained the actual gain of second frequency band.
In embodiments of the present invention; Corresponding nominal gain G (1) in the individual band of K (K for greater than 1 integer), measure respectively K fiducial error value off_1 (1) ..., off_K (1); And corresponding successively n nominal gain measure corresponding fiducial error off_1 (n) ..., off_K (n), generate the fiducial error table.
If the corresponding nominal gain that is provided with of measured signal is G (i); Its frequency is arranged in Band A, and carrier frequency is f_a, is that the frequency of G (i) and measured signal is positioned at Band A according to nominal gain; The fiducial error that obtains this moment is off_A (i); Obtaining the frequency compensation value of carrier frequency f_a in band A is f_A (f_a), and then gain compensation value is off_A (i)+f_A (f_a), and then actual gain is G (i)+off_A (i)+f_A (f_a).
When measured signal when band A is cross over band B; After only need switching fiducial error table and frequency compensation table; Obtain this moment fiducial error be off_B (i)), frequency compensation value f_B (f_a); Then gain compensation value is off_B (i)+f_B (f_a), and then actual gain is G (i)+Off_B (i)+f_B (f_a).
Therefore when striding the band measurement, only need to switch fiducial error table and frequency compensation table, and need not the handoff gain master meter, reduce the switching time and the memory space of striding the band different-frequency measure.
Fig. 4 shows the realization flow of striding the gain compensating method in the frequency band measurement that third embodiment of the invention provides, and details are as follows:
In S301; Before striding the frequency band measurement; Obtain datum drift between the fiducial error of arbitrary frequency band in fiducial error and other a plurality of frequency bands of first frequency band to obtain the frequency compensation table; Frequency compensation value between this different frequency bands is corresponding with the datum drift between different frequency bands, and datum drift is the difference of the fiducial error between the different frequency bands between this different frequency bands;
In S302, when striding the frequency band measurement, obtain the fiducial error of first frequency band;
In S303, the gain compensation value that fiducial error and the frequency compensation table through first frequency band calculates second frequency band, this frequency compensation table comprises the frequency compensation value between different frequency bands;
In S304, the gain compensation value addition of the preset gain of second frequency band and second frequency band is obtained the actual gain of said second frequency band.
In embodiments of the present invention; Under preset nominal gain G (i); When striding the band measurement, if measured signal is positioned at Band B, carrier frequency is f_b; The difference of then calculating the corresponding fiducial error of the Band B fiducial error corresponding with preset bandA is as datum drift off_B (i)-off_A (i); Because off_B (i)-off_A (i) is very little with the difference that i changes, so off_B (i)-off_A (i) can be approximated to be E{off_B-off_A}, and this E{off_B-off_A} is band A and the mean value of band B under multiple nominal gain.
Then the fiducial error value is: off_A (i)+(off_B (i)-off_A (i));
Be approximately: off_A (i)+E{off_B-off_A}.
Then gain compensation value is: off_A (i)+f_B (f_a)+(off_B (i)-off_A (i));
Be approximately: off_A (i)+f_B (f_a)+E{Off_B-Off_A}.
Actual gain is: G (i)+off_A (i)+f_B (f_a)+(Off_B (i)-Off_A (i));
Be approximately G (i)+off_A (i)+f_B (f_a)+E{Off_B-Off_A}.
As one embodiment of the invention, can write down the datum drift between a plurality of band, and call when needed, can avoid when striding the band measurement, switching the fiducial error table, further shorten switching time, dwindle memory space.
Fig. 5 shows the structure chart of striding the gain compensation means in the frequency band measurement that one embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention.
The gain compensation means 4 based on striding in the band measurement that provides as one embodiment of the invention can be applicable to worldwide interoperability for microwave connecting system (Worldwide Interoperability for Microwave Access; WIMAX), in the receiver of the big frequency differences such as multimode terminal of a plurality of systems of support; And be applied to LTE and survey global system for mobile communications (Global System for Mobile Communications; GSM); LTE surveys TD-SCDMA system (Time Division-Synchronous Code Division Multiple Access; TDSCDMA), (Wideband Code Division Multiple Access WCDMA) waits in the isosystem measurement LTE survey WCDMA access system.
Should comprise based on the gain compensation means 4 of striding in the band measurement:
Fiducial error acquiring unit 41 is used for when striding the frequency band measurement, obtaining the fiducial error of first frequency band, and this fiducial error is the actual gain of first frequency band and the difference of nominal gain;
Computing unit 42; Be used for the gain compensation value that fiducial error and frequency compensation table through first frequency band calculate second frequency band; And the gain compensation value addition of the preset nominal gain of second frequency band and second frequency band obtained the actual gain of second frequency band, this frequency compensation table comprises the frequency compensation value between different frequency bands.
As one embodiment of the invention, fiducial error acquiring unit 41 can comprise:
The fiducial error table generates module; Be used for before striding the frequency band measurement; Obtain a plurality of fiducial error values of a plurality of frequency bands respectively, generating the fiducial error table, the fiducial error of each frequency band be to preset actual gain and the difference of nominal gain of frequency under pre-conditioned in each frequency band;
The fiducial error acquisition module is used for when striding the frequency band measurement, according to treating the fiducial error table, obtaining the fiducial error value of first frequency band.
In embodiments of the present invention, if when the nominal gain of each frequency band is a plurality of, each frequency band has a plurality of fiducial errors, and each fiducial error is respectively the preset actual gain of frequency under pre-conditioned and the difference of each fiducial error in a plurality of fiducial error.
Preferably, fiducial error acquiring unit 41 can also comprise:
The frequency compensation table generates module; Be used for before striding the frequency band measurement; Obtain datum drift between the fiducial error of arbitrary band among fiducial error and other a plurality of band of a band to obtain the frequency compensation table; Frequency compensation value between this difference band is corresponding with the datum drift between different band, and the datum drift between different band is the difference of the fiducial error between the different band;
The fiducial error acquisition module is used for when striding the frequency band measurement, obtaining the fiducial error of a band.
The embodiment of the invention is not switched master meter striding when band measures,, dispose and the pilot frequency point frequency is compensated through fiducial error and fixing nominal gain through tabling look-up; Need not demand, reduced cost, reduce the switching time and the memory space of striding the band different-frequency measure the device precision; And obtain fiducial error through nominal fiducial error and fiducial error deviation; Avoid switching the fiducial error table and compensate, further improved switching time, reduced memory space.
More than be merely preferred embodiment of the present invention,, all any modifications of within spirit of the present invention and principle, being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention not in order to restriction the present invention.
Claims (8)
1. a gain compensating method of striding in the frequency band measurement is characterized in that, comprising:
When striding the frequency band measurement, obtain the fiducial error of first frequency band, said fiducial error is the actual gain of said first frequency band and the difference of nominal gain;
The gain compensation value that fiducial error and frequency compensation table through said first frequency band calculates second frequency band, said frequency compensation table comprises the frequency compensation value between different frequency bands;
The gain compensation value addition of the preset gain of said second frequency band and said second frequency band is obtained the actual gain of said second frequency band.
2. the method for claim 1 is characterized in that, before striding the frequency band measurement, also comprises:
A plurality of fiducial error values of obtaining a plurality of frequency bands respectively to be generating the fiducial error table, and the fiducial error of each frequency band is actual gain and the difference of nominal gain of preset frequency under pre-conditioned in said each frequency band;
The said fiducial error that obtains first frequency band comprises:
Obtain the fiducial error of first frequency band according to said fiducial error table.
3. method as claimed in claim 2; It is characterized in that; If when the nominal gain of each frequency band was a plurality of, each frequency band had a plurality of fiducial errors, each fiducial error is respectively the preset actual gain of frequency under pre-conditioned and the difference of each fiducial error in a plurality of fiducial error.
4. like each described method among the claim 1-3, it is characterized in that, before striding the frequency band measurement, also comprise:
Obtain datum drift between the fiducial error of arbitrary frequency band in fiducial error and other a plurality of frequency bands of first frequency band to obtain the frequency compensation table; Frequency compensation value between said different frequency bands is corresponding with the datum drift between different frequency bands, and the datum drift between said different frequency bands is the difference of the fiducial error between the different frequency bands.
5. stride the gain compensation means of frequency band in measuring for one kind, it is characterized in that said device comprises:
The fiducial error acquiring unit is used for when striding the frequency band measurement, obtaining the fiducial error of first frequency band, and said fiducial error is the actual gain of said first frequency band and the difference of nominal gain;
Computing unit; Be used for the gain compensation value that fiducial error and frequency compensation table through said first frequency band calculate second frequency band; And the gain compensation value addition of the preset nominal gain of said second frequency band and said second frequency band obtained the actual gain of said second frequency band, said frequency compensation table comprises the frequency compensation value between different frequency bands.
6. device as claimed in claim 5 is characterized in that, said fiducial error acquiring unit comprises:
The fiducial error table generates module; Be used for before striding the frequency band measurement; Obtain a plurality of fiducial error values of a plurality of frequency bands respectively, generating the fiducial error table, the fiducial error of each frequency band is actual gain and the difference of nominal gain of preset frequency under pre-conditioned in said each frequency band;
The fiducial error acquisition module is used for when striding the frequency band measurement, according to said fiducial error table, obtaining the fiducial error value of first frequency band.
7. device as claimed in claim 6; It is characterized in that; If when the nominal gain of each frequency band was a plurality of, each frequency band had a plurality of fiducial errors, each fiducial error is respectively the preset actual gain of frequency under pre-conditioned and the difference of each fiducial error in a plurality of fiducial error.
8. like each described device among the claim 5-7, it is characterized in that said fiducial error acquiring unit comprises:
The frequency compensation table generates module; Be used for before striding the frequency band measurement; Obtain datum drift between the fiducial error of arbitrary frequency band in fiducial error and other multiband of first frequency band to obtain the frequency compensation table; Frequency compensation value between said different frequency bands is corresponding with the datum drift between different frequency bands, and the datum drift between said different frequency bands is the difference of the fiducial error between the different frequency bands;
The fiducial error acquisition module is used for when striding the frequency band measurement, obtaining the fiducial error of first frequency band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100975604A CN102664599A (en) | 2012-04-05 | 2012-04-05 | Gain compensation method in band-cross measurement and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100975604A CN102664599A (en) | 2012-04-05 | 2012-04-05 | Gain compensation method in band-cross measurement and device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102664599A true CN102664599A (en) | 2012-09-12 |
Family
ID=46774034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100975604A Pending CN102664599A (en) | 2012-04-05 | 2012-04-05 | Gain compensation method in band-cross measurement and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102664599A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830079A (en) * | 2019-11-29 | 2020-02-21 | 小唐科技（上海）有限公司 | Frequency hopping gain control device and control method |
| CN111049536A (en) * | 2019-12-24 | 2020-04-21 | 电信科学技术第一研究所有限公司 | System and method for improving and processing amplitude-frequency characteristics of signals of radio frequency system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119127A (en) * | 2007-09-21 | 2008-02-06 | 深圳市虹远通信有限责任公司 | Method to implement in-band gain balance of working frequency band for frequency-select module of repeater |
| CN101369835A (en) * | 2008-10-14 | 2009-02-18 | 深圳华为通信技术有限公司 | Gain compensation method and device of wireless terminal |
| CN101945417A (en) * | 2010-06-28 | 2011-01-12 | 深圳市华为安捷信电气有限公司 | Method and device for computing gains of multiple receiving links/transmitting links |
-
2012
- 2012-04-05 CN CN2012100975604A patent/CN102664599A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119127A (en) * | 2007-09-21 | 2008-02-06 | 深圳市虹远通信有限责任公司 | Method to implement in-band gain balance of working frequency band for frequency-select module of repeater |
| CN101369835A (en) * | 2008-10-14 | 2009-02-18 | 深圳华为通信技术有限公司 | Gain compensation method and device of wireless terminal |
| CN101945417A (en) * | 2010-06-28 | 2011-01-12 | 深圳市华为安捷信电气有限公司 | Method and device for computing gains of multiple receiving links/transmitting links |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830079A (en) * | 2019-11-29 | 2020-02-21 | 小唐科技（上海）有限公司 | Frequency hopping gain control device and control method |
| CN110830079B (en) * | 2019-11-29 | 2021-06-25 | 小唐科技（上海）有限公司 | Frequency hopping gain control device and control method |
| CN111049536A (en) * | 2019-12-24 | 2020-04-21 | 电信科学技术第一研究所有限公司 | System and method for improving and processing amplitude-frequency characteristics of signals of radio frequency system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2673880B1 (en) | Group delay calibration method for power amplifier envelope tracking | |
| US9794006B2 (en) | Envelope tracking RF transmitter calibration | |
| CN101529730B (en) | Controlling the bandwidth of an analog filter | |
| EP3046260A1 (en) | Highly integrated radio frequency transceiver | |
| CN108333557B (en) | Phase calibration system and method of multi-channel direction finding receiver | |
| CN104301047B (en) | A kind of power self-calibration device and method of multimode multi-frequency multi-channel system | |
| CN105577594B (en) | A kind of quick local oscillator leakage calibration device and method towards I/Q modulator | |
| CN102771053B (en) | Device and method for communications correction | |
| CN103368666A (en) | Method and apparatus for simultaneous RF testing of multiple devices in specific frequency bands | |
| US20140219392A1 (en) | Method And Device For Acquiring Multi-Frequency Band Digital Predistortion Output Signals | |
| CN101111992A (en) | Polar coordinate modulation circuit, polar coordinate modulation method, integrated circuit, and radio transmission apparatus | |
| CN102186264A (en) | Remote radio unit and remote ratio method | |
| CN104215855A (en) | Measuring distance adjustable OTA (over-the-air) test darkroom | |
| CN101873617A (en) | Method, system and mobile terminal for radio frequency power calibration | |
| CN103135115A (en) | Method for performing inter-channel bias calibration and global navigation satellite system receiver | |
| KR20160138040A (en) | Feedback receive path with low-if mode | |
| KR20170012268A (en) | Transmitter digital-to-analog converter (dac)- baseband filter (bbf) common mode interface | |
| CN105515688B (en) | A kind of calibration method of the calibration of power device of transmitter | |
| CN105025503B (en) | A kind of standing-wave ratio detecting method and system of TD-LTE RRU | |
| GB2348060A (en) | Transmitter power control system for a CDMA base station | |
| CN102916694B (en) | A kind of local oscillation signal control method and device | |
| CN102664599A (en) | Gain compensation method in band-cross measurement and device thereof | |
| CN112399329B (en) | Method, equipment and device for synthesizing, sending and receiving reference signals | |
| US7203614B2 (en) | Method and calibration system for IQ DC offset and imbalance calibration by utilizing analytic formulas to quickly determined desired compensation values | |
| KR20170112916A (en) | Method and apparatus for second order intercept point (ip2) calibration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120912 |