CN101359921A - Calibration gauge acquiring method and apparatus, automatic gain calibration method and apparatus - Google Patents
Calibration gauge acquiring method and apparatus, automatic gain calibration method and apparatus Download PDFInfo
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- CN101359921A CN101359921A CNA200810149006XA CN200810149006A CN101359921A CN 101359921 A CN101359921 A CN 101359921A CN A200810149006X A CNA200810149006X A CN A200810149006XA CN 200810149006 A CN200810149006 A CN 200810149006A CN 101359921 A CN101359921 A CN 101359921A
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Abstract
The invention discloses an automatic gain control calibration method of a radio-frequency receiver as well as an apparatus thereof, the calibration method is to acquire an automatic gain control calibration table through the FFT operation of the useful power of calibrating signals treated by passing through a channel of the receiver under a calibration mode of the receiver, and uses the automatic gain control calibration table to provide the gain in conformity with the received signals for the receiver under an operating mode. The method and the apparatus can resist the noise of the receiver and acquire the accurate automatic gain control calibration table, thereby improving the gain accuracy of the receiver under small signals.
Description
Technical field
The present invention relates to radio-frequency transmitter, relate in particular to a kind of calibration chart acquisition methods and device and automatic gain calibration method and apparatus of radio-frequency transmitter.
Background technology
During radio-frequency transmitter work, be provided with down at identical receiver gain, the input signal power of base band is along with the size of extraneous signal intensity changes.When extraneous signal intensity was big, the input power of receiver base band was big; When extraneous signal intensity hour, receiver base band input power is little.The signal that receiver received, change with various conditions has very big difference, the channel of the unconscious upset radio communication of meeting, destroyed the performance of radio frequency receiver to a great extent, make the signal strength signal intensity that needs to receive take place to change fast, the variation of signal strength signal intensity can be by several microvolts to the hundreds of millivolt.But we wish that receiver output level excursion is as far as possible little, avoid strong signal to make and put saturation distortion in the final stage, and make analog to digital converter (ADC) produce saturation distortion; Received signal is too weak can be because of the normally demodulation that can not meet the demands of demodulator power input signal-to-noise ratio.Therefore, when receiving weak signal, wish that receiver has sufficiently high gain, and when receiving strong signal, the gain of receiver should reduce.(as the control of the volume on the receiver) realizes it being difficult if this requirement is by artificial gain controlling, must adopt the working method of automatic gain control (AGC, Automatic Gain Control).
As shown in Figure 1, Fig. 1 is the radio-frequency transmitter system that has the AGC working method, in radio-frequency transmitter, increase by one and can control variable gain amplifier (VGA, the closed loop of the control signal wire of gain Variable Gain Amplifier), when the signal that receives is very strong, baseband processor is just exported the signal that control VGA gain diminishes, otherwise, if the signal that receives is more weak, baseband processor will be exported control VGA gain and become big signal, thereby maintenance enters the power of the digital signal of baseband processor and remains unchanged, and improves the communication performance of receiver.
But, there is a large amount of analogue devices in the radio-frequency transmitter, in order to eliminate the inconsistency of radio-frequency devices, solve the bigger problem of radio-frequency transmitter initial gain error, need carry out the AGC calibration to radio-frequency transmitter.Traditional AGC calibration steps is that the available power of carrying out received signal in time domain is calculated, like this, the plate level noise of radio-frequency transmitter can produce ill effect when small-signal (as the under-the 100dBm) calibration to receiver, because described small-signal can be submerged in the noise, the received power size of baseband processor computing just can not reflect the actual power value, thereby the real channel gain of radio-frequency transmitter that the calibration-gain that produces neither be expected causes the accuracy and the accuracy of radio-frequency transmitter AGC calibration chart destroyed; Moreover, in radio-frequency transmitter, especially directly change in the receiver, in order to remove the influence that DC component causes the signal that is input to Base-Band Processing, usually realize the removal of DC component by the filter of radio-frequency transmitter, but radio-frequency filter has certain stabilization time, that is to say, in the stabilization time of radio-frequency filter, if adopt time domain to calculate the method for received signal available power, DC component is produced serious influence to baseband processor and back end communications circuit.
Summary of the invention
The objective of the invention is to provide baseband signal in the time of to overcome above-mentioned AGC calibration to be subjected to the influence of factors such as noise, cause the inaccurate phenomenon of baseband signal available power that is calculated.
For achieving the above object, embodiments of the invention provide a kind of AGC calibration chart acquisition methods that can resist the receiver noise radio-frequency transmitter, make radio-frequency transmitter under calibration mode, obtain accurate automatic gain control calibration data by this method, for automatic gain control (AGC) provides accurate calibration parameters, improve the gain accuracy of receiver under small-signal.
Another object of the present invention is to provide a kind of AGC calibration chart deriving means of antimierophonic radio-frequency transmitter.
A further object of the present invention provides a kind of AGC calibration steps of radio-frequency transmitter.
Another purpose of the present invention provides a kind of AGC calibrating installation of radio-frequency transmitter.
The AGC calibration chart acquisition methods of a kind of radio-frequency transmitter of the present invention may further comprise the steps:
A: receive the digital baseband signal sequence, described digital baseband signal sequence is to obtain after calibrating signal sequence with setting power is handled through the radio-frequency transmitter passage;
B: the digital baseband signal sequence that receives is carried out the FFT conversion and at frequency-domain calculations power, obtained the gain sequence of receiver, and obtain being used to generate the original sampling point array of automatic gain control calibration table;
C: to described original sampling point array, carry out curve fitting, generate the automatic gain control calibration table.
Before steps A, also comprise the step of setting receiver gain control word sequence and calibrating signal power sequence.
Among the described step B, the element of described original sampling point array is a receiver gain control word sequence and corresponding to the radio-frequency transmitter of receiver gain control word sequence gain sequence.
Described step B further comprises: to the digital baseband signal sequence process FFT frequency domain power calculation that receives, obtain the available power sequence of radio-frequency transmitter, the difference of power sequence by calculating calibrating signal and the corresponding useful receiver power sequence that calculates through FFT again obtains the gain sequence of radio-frequency transmitter.
Described calibrating signal is for having the sinusoidal signal of certain frequency deviation with respect to carrier frequency.
The automatic gain control calibration table deriving means of a kind of radio-frequency transmitter of the present invention comprises:
Signal receiving unit is used to receive the digital baseband signal sequence that obtains after the calibrating signal sequence process receiver conversion process;
The receiver gain arithmetic element is used for the digital baseband signal sequence that receives is carried out the FFT conversion and at frequency-domain calculations power, obtained the gain sequence of receiver, and obtains being used to generate the original sampling point array of automatic gain control calibration table;
The automatic gain calibration table generates the unit, is used for described original sampling point array is carried out curve fitting, and obtains the automatic gain control calibration table.
Described automatic gain calibration table deriving means also comprises setup unit further, and described setup unit is used for setting receiver gain control word sequence and calibrating signal power sequence.
The mapping relations of described automatic gain control table between receiver gain control word and receiver gain, setting up.
Described receiver gain arithmetic element, be used for digital baseband signal sequence process FFT frequency domain power calculation further to receiving, obtain the available power sequence of receiver, the difference of power sequence by calculating calibrating signal and the corresponding useful receiver power sequence that calculates through FFT again obtains the gain sequence of receiver.
Described receiver gain arithmetic element includes and is used for the computing module at the FFT of frequency-domain calculations power calculation.
The automatic gain control calibration method of a kind of radio-frequency transmitter of the present invention may further comprise the steps:
Under calibration mode, receiver receives calibrating signal, and receiver receives calibrating signal, and calibrating signal is handled signal afterwards through passage carry out the FFT conversion and at frequency-domain calculations power, generate and store the automatic gain control calibration table;
Under mode of operation, according to the size of received signal, receiver is searched corresponding gain in described automatic gain control table, and coming provides suitable gain for received signal.
Described calibration mode is that receiver receives calibrating signal, and the digital baseband signal that calibrating signal carries out obtaining after passage is handled is carried out the FFT conversion and at frequency-domain calculations power, generates the automatic gain control calibration table thus.
Described mode of operation is the receiver received RF signal, and radiofrequency signal is being carried out provide channel gain in the passage processing procedure automatically.
The automatic gain control calibration device of a kind of radio-frequency transmitter of the present invention comprises:
Mode switch element is used for switching between the calibration mode of radio-frequency transmitter and mode of operation;
Automatic gain control calibration table deriving means under radio-frequency transmitter is operated in calibration mode, is used to generate the automatic gain control calibration table;
Search the unit, under radio-frequency transmitter is operated in mode of operation, be used to visit the automatic gain control calibration table, search the gain that adapts with the radio-frequency transmitter received signal;
The gain output unit is used for exporting to the gain control end of the passage processing section of radio-frequency transmitter with searching the gain that the unit obtains.
As shown from the above technical solution, embodiments of the invention are by adopting the available power of FFT computing digital baseband signal in radio-frequency transmitter, and convert the gain of receiver further to, thereby generate the automatic gain control calibration table that uses under the radio-frequency transmitter mode of operation, therefore have following beneficial effect:
Mainly to concentrate on frequency shift (FS) be f because the advantage of FFT computing signal power is the energy of digital baseband signal
CaliThe place can isolate interference signal and DC component, so the automatic gain control calibration table that generates can reduce receiver noise to greatest extent to receiving the deterioration of calibrating signal, improves the precision of AGC calibration;
Owing to use the FFT computing module in the radio-frequency transmitter existing structure, therefore do not need to increase again extra hardware configuration, just can realize this method, thereby can provide the accurate gain control signal for received signal.
The present invention can be applied to directly conversion hysteria radio-frequency transmitter calibration system such as TD-SCDMA radio-frequency transmitter, W-CDMA radio-frequency transmitter.
With reference to the accompanying drawing description of a preferred embodiment, above-mentioned and other purpose of the present invention, feature and advantage will be more obvious by following.
Description of drawings
Fig. 1 is the principle schematic of the traditional radio-frequency transmitter system that has the AGC control mode;
Fig. 2 is the flow chart of the generation AGC calibration chart of a preferred embodiment of the present invention;
Fig. 3 is the structured flowchart of the AGC calibration chart deriving means of a preferred embodiment of the present invention;
Fig. 4 is the structured flowchart of calibrating installation of the radio-frequency transmitter of a preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.Should be noted that specific embodiment described herein only is used to illustrate, be not limited to the present invention.
Fig. 1 is a kind of radio-frequency transmitter system principle schematic diagram that typically has AGC, in Fig. 1, radiofrequency signal is through low noise amplifier (LNA, Low Noise Amplifier) amplifies isolation and band pass filter (BPF, Band Pass Filter) after the filtering, with the signal (LO that shakes of the two-part code of quadrature each other, Local Oscillation) mixing (Mixer), produce homophase and quadrature two-way baseband signal respectively, again by low pass filter (LPF, Low Pass Filter) and variable gain amplifier (VGA, Variable GainAmplifier) finishing channel selection and gain adjusts, the analog baseband signal of Chan Shenging becomes digital baseband signal and enters in the baseband processor after carrying out analog-to-digital conversion through analog to digital converter (ADC, Analog Data Converter) and sampling then.As can be seen from Figure 1, after above-mentioned radiofrequency signal was handled through the passage of radio-frequency transmitter, before entering into baseband processor, the increase intensity of its signal was decided by the gain of VGA.Also be that the part that the whole channel gain of radio-frequency transmitter mainly works is VGA, the voltage of its ride gain is the feedback control signal from baseband processor.Wherein in baseband processor, establish the calibration chart of the corresponding relation of receiver gain control word and receiver gain, by in calibration chart, searching the gain that adapts with received signal, and export the gain control end that a gain control signal is given VGA, control the channel gain of radio-frequency transmitter, thereby make the dynamic range of signals of receiver channel output very little, avoid performance impact receiver back-end processing part.
Need to prove that Fig. 1 is the receiver system of a preferred embodiment of the present invention, each processing section of receiver described here all meets the requirement of receiver operate as normal, can reflect the gain characteristic of radio-frequency transmitter truly.Can only not be applicable to radio-frequency transmitter system shown in Figure 1 but technology of the present invention does not show, so long as the method for this receiver control gain, and this accurate control relation need calibrate and could determine, technology of the present invention all can extensively be suitable for.
Radio-frequency transmitter automatic gain control calibration table, be to handle the available power difference that enters into baseband processor afterwards through receiver channel by original power and the calibrating signal of calculating calibrating signal, obtain the gain of radio-frequency transmitter, thereby set up a mapping relations calibration chart about receiver gain control word and receiver gain.Calibration chart of the present invention wherein calculates when entering into the signal available power of baseband processor in generative process, is not the method that adopts time domain signal calculated power, but uses the frequency-domain calculations signal power.
Use traditional way of calculating received signal power in time domain, the computing formula of this method is as follows:
Wherein, P
RXBe received signal power, L
iAnd Q
iBe respectively the sampling point of the digital baseband signal of received signal behind over-sampling, from above-mentioned formula as can be seen, DC component and interference signal also can generate digital sampling point through over-sampling, be included in the middle of the received signal, so at small-signal (100dBm), signal is submerged in the middle of the above-mentioned noise, and the received power size of baseband processor computing can not reflect the actual power value, causes the accuracy and the accuracy of radio-frequency transmitter gain A GC calibration chart destroyed.
And the method for FFT calculating received power is as follows, and the digital sampling point behind over-sampling carries out the FFT computing to received signal, and operational formula is as follows:
From formula as can be seen, the characteristics of FFT conversion are exactly that the signal energy that is calculated mainly concentrates on the frequency deviation place, therefore DC component has been retained near the zero-frequency, and other interference signal frequency can with the received signal frequency isolation, guarantee to enter the power that calculates in the baseband processor just in the available signal power at frequency deviation place, and do not comprised the power of other interference signal and unwanted signal.
Particularly, the present invention is on the basis that does not change Fig. 1 tradition receiver system hardware configuration, use FFT (the Fast Fourier Transform Algorithm of radio-frequency transmitter inside (baseband processor part), fast fourier transform) computing module carries out the frequency domain power calculation to the digital baseband signal that is input in the baseband processor, obtain removing the baseband signal available power of interference signal, and obtain actual receiver gain further, thereby generate the AGC calibration chart that radio-frequency transmitter uses under normal mode of operation.
For this reason, the invention provides a kind of AGC calibration table generating method, Fig. 2 is the flow chart that the radio-frequency transmitter of a preferred embodiment of the present invention generates calibration chart, as shown in Figure 2, radio-frequency transmitter is operated under the calibration mode, at first set the receiver gain control word sequence A GC_code (i) of radio-frequency transmitter and the power sequence Px_Power_REF (i) (step 201) of calibrating signal, described each receiver gain control word has the power of a corresponding calibrating signal.
Here need to choose the number of the receiving gain control word of radio-frequency transmitter according to actual conditions, the number of considering the gain controlling word is many more, its projection accuracy is high more, also extended simultaneously and calibrated and searched the time complexity of calibration chart, therefore in fact, choosing method is to compromise between the deduction precision of radio-frequency transmitter alignment time and dc shift.According to the number of the receiving gain control word of choosing, thereby obtain a receiving gain control word sequence A GC_code (i), i gets 1,2 here ..., N.
Preferably, described calibrating signal is sinusoidal wave, and with carrier frequency f
cCertain frequency deviation f is arranged
Cali, described calibrating signal both can be launched by outside source, also can be launched by the built-in signal transmitter unit of radio-frequency transmitter self, and be received by the signal receiving unit of receiver self.
Among the present invention, when setting the power sequence of calibrating signal, consider the watt level of the signal that actual reception arrives, take into account all possible actual signal power scope all sidedly as far as possible, thereby can be under the mode of operation of receiver, for actual reception to signal suitable gain is provided.
Then according to the calibrating signal power sequence of setting in the step 201, change calibrating signal power P x_Power_REF (i) (step 202) successively, here i from 1 to N, the calibrating signal of different capacity is received machine and carries out converting baseband signal to and being input to (step 203) in the baseband processor after the passage processing.Passage described here is handled, after referring to that radio-frequency transmitter receives described calibrating signal, after low noise amplifier (LNA) amplifies isolation and band pass filter (BPF) filtering, with signal (LO) mixing of shaking of the two-part code of quadrature each other, produce homophase and quadrature two-way baseband signal respectively, channel is selected and gain adjustment is finished by low pass filter (LPF) and variable gain amplifier (VGA), because radio-frequency transmitter is under the calibration mode, therefore baseband processor only provides coarse gain control signal to VGA, the analog baseband signal that produces after the VGA amplifying signal passes through analog to digital converter (ADC) again and carries out converting digital baseband signal to and exporting to baseband processor after analog-to-digital conversion and the sampling at last.
Then, baseband processor is carried out receiver gain calculating (step 204) to the digital baseband signal of input.Baseband processor part in the radio-frequency transmitter generally all has FFT (fast fourier transform) module, such as, in the OFDM demodulator (OFDM) that baseband signal is handled that in radio-frequency transmitter, usually adopts, just has the FFT module, therefore can utilize the FFT module in the radio-frequency transmitter existing structure, digital baseband signal is carried out the frequency domain power calculation.The effect of FFT module is that the data of will sample transform from the time domain to frequency domain, and therefore when digital power of baseband signal was handled, as can be known, it was f that the energy of digital baseband signal mainly concentrates on frequency shift (FS)
CaliThe place can directly filter DC component and interference signal, therefore uses the FFT module to obtain accurately at frequency deviation f
CaliThe available signal power at place, thus receiver gain accurately can be obtained.
In above-mentioned steps 204, the radio-frequency transmitter gain mainly is that the available signal power after the FFT module is calculated draws according to calibrating signal power of setting and correspondence, particularly, radio-frequency transmitter gain A GC_Gain (i) is the difference of the calibrating signal power Rx_Power_REF (i) and the available signal power Rx_Power_FFT (i) after the FFT module is calculated of setting, be AGC_Gain (i)=Rx_Power_FFT (i)-Rx_Power_REF (i)+C, wherein C is a fixed constant, and this constant is used for changing actual radio-frequency transmitter gain.
The above-mentioned calibrating signal with different capacity value to setting successively receives, changes, calculates available power etc., whole (steps 205,206) in the calibrating signal power sequence of finishing setting.As shown in the above, the one-to-one relationship that the calibrating signal sequence of gain controlling word sequence and setting, the available power sequence of calculating through FFT at last and the radio-frequency transmitter gain sequence that calculates have, thus draw the corresponding relation of following table 1:
Table 1
| Receiver gain control word | Set calibrating signal power | Calibrating signal Power arithmetic value | Receiver gain |
| AGC_Code(1) | Rx_Power_REF(1) | Rx_Power_FFT(1) | AGC_Gain(1) |
| AGC_Code(2) | Rx_Power_REF(2) | Rx_Power_FFT(2) | AGC_Gain(2) |
| … | … | … | … |
| AGC_Code(N) | Rx_Power_REF(N) | Rx_Power_FFT(N) | AGC_Gain(N) |
The content of above table carries out curve fitting to original sampling point array [AGC_Code (i), AGC_Gain (i)] for producing the original sampling point of AGC calibration chart, has just generated the AGC calibration chart.The method of curve fit, referring to publication number CN2007101188075 in first to file, can be according to the accuracy of above-mentioned original sampling point and system, determine curve-fitting method, existing curve-fitting method has polynomial fitting method, logarithmic function fitting process and curve segmentation fitting process, according to the curve model function expression that curve-fitting method calculates, generate radio frequency AGC calibration chart further.
The AGC calibration chart that generates is stored in the baseband processor, under the normal mode of operation of radio-frequency transmitter, baseband processor is searched corresponding gain according to the signal that is received in the AGC calibration chart, thereby the gain amplifier of control variable gain amplifier reaches the purpose that automatic control signal gains.
The process of the calibration chart that generates according to foregoing description, corresponding the present invention also provides a kind of AGC calibration chart deriving means, and as shown in Figure 3, this device comprises signal receiving unit, receiver gain arithmetic element and AGC calibration chart generation unit.
Described signal receiving unit is used to receive the digital baseband signal that converts to after calibrating signal is handled through the radio-frequency transmitter passage.
Described receiver gain arithmetic element is used for digital baseband signal, and carry out FFT frequency domain power calculation and receiver gain and calculate, thus the original sampling point of generation AGC calibration chart.Wherein said receiver gain arithmetic element includes FFT computing module and gain computing module, described FFT computing module is used for calculating the power of digital baseband signal, described gain computing module is used for the gain that the setting power of the power of the digital baseband signal that calculates according to the FFT computing module and calibrating signal calculates receiver, and the function of the computing module that gains here can merge in the FFT computing module.
Described AGC calibration chart generation unit is used for the original sampling point to the AGC calibration chart that obtains, and carries out curve fitting, and generates the AGC calibration chart.
AGC calibration chart deriving means of the present invention preferably, also comprises setup unit, and described setup unit is used to set the power sequence and the receiver gain control word sequence of calibrating signal.
AGC calibration chart deriving means of the present invention, wherein setup unit configures the power sequence and the receiver gain control word sequence of calibrating signal, and the power sequence of described calibrating signal is corresponding with receiver gain control word sequence.Signal receiving unit receives calibrating signal and handles the digital baseband signal that converts to afterwards through receiver channel then, the receiver gain arithmetic element is carried out FFT frequency domain power calculation to described digital baseband signal, try to achieve the available signal power of digital baseband signal, and the difference of calibrating signal power of calculate setting and the available signal power that calculates through FFT, obtain the actual gain of receiver, thereby receiver gain control word according to this calibrating signal correspondence, set up the mapping relations of receiver gain control word and receiver gain, obtain being used to generate the original sampling point of AGC calibration chart.Last AGC calibration chart generation unit carries out curve fitting to original sampling point, generates the AGC calibration chart.
The present invention is under calibration mode, and receiver uses the FFT module that baseband signal is carried out the frequency domain power calculation, thereby generates the AGC calibration chart, and is stored in the baseband processor; Under mode of operation, receiver uses the AGC calibration chart of storing in the baseband processor, searches and the corresponding receiver gain of received signal, for receiver provides a suitable gain control signal.
Calibration mode wherein described here is different from normal mode of operation, the signal that radio-frequency transmitter receives is not an external radio-frequency signal, but calibrating signal, and when calibrating signal being carried out the passage processing, baseband processor provides a coarse gain control signal for VGA, and under mode of operation, baseband processor is searched accurate gain according to the size of received signal and is provided an accurate gain control signal for VGA in calibration chart.
The present invention also provides a kind of gain correction device of radio-frequency transmitter, described gain correction device is in the Base-Band Processing part of radio-frequency transmitter, as shown in Figure 4, described gain correction device comprise mode switch element, search the unit, AGC calibration chart deriving means, gain output unit.
Described mode switch element, be used between the calibration mode of radio-frequency transmitter and mode of operation, switching, under calibration mode, radio-frequency transmitter (mainly being the Base-Band Processing part) generates the automatic gain control calibration table, under mode of operation, radio-frequency transmitter provides gain for its channel part automatically by the calibration chart of searching under the calibration mode.
Described AGC calibration chart deriving means is used under radio-frequency transmitter is operated in calibration mode, generates the automatic gain control calibration table, and described calibration chart generating apparatus comprises signal receiving unit, receiver gain arithmetic element and AGC calibration chart generation unit; Preferably, described calibration chart generating apparatus also comprises setup unit; Each cell mesh of AGC calibration chart generating apparatus wherein, the front is described further, does not give unnecessary details here.
The described unit of searching is used for being operated in visit automatic gain control calibration table under the mode of operation at radio-frequency transmitter, searches the gain that adapts with the radio-frequency transmitter received signal.
Described gain output unit is used for becoming the control voltage signal to searching the gain conversions with received signal adapts that the unit obtains, and exports to the gain control end of passage processing section.Preferably, the control voltage signal is exported to the gain control end of VGA.
The present invention adopts the existing built-in FFT module of the baseband processor part of radio-frequency transmitter, does not need extra hardware and software, just can realize the frequency domain power calculation of digital baseband signal.Wherein the length of the computing of FFT can be chosen according to actual needs, as gets N=128,512,1024 etc.
The present invention uses the FFT conversion to calculate power of baseband signal, has removed useless power such as interference noise and DC component, calculates the received power of actual baseband processor, thereby the AGC calibration chart accuracy and the accuracy that generate are greatly improved.
Though described the present invention with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from invention because the present invention can specifically implement in a variety of forms, so be to be understood that, the foregoing description is not limited to any aforesaid details, and should be in the spirit and scope that claim limited of enclosing explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (16)
1. the automatic gain control calibration list acquirement method of a radio-frequency transmitter is characterized in that, said method comprising the steps of:
A: receive the digital baseband signal sequence, described digital baseband signal sequence is to obtain after calibrating signal sequence with setting power is handled through receiver channel;
B: the digital baseband signal sequence that receives is carried out the FFT conversion and at frequency-domain calculations power, obtained the gain sequence of receiver, and obtain being used to generate the original sampling point array of automatic gain control calibration table;
C: to described original sampling point array, carry out curve fitting, generate and store the automatic gain control calibration table.
2. method according to claim 1 is characterized in that, before steps A, also comprises the step of setting receiver gain control word sequence and calibrating signal power sequence.
3. method according to claim 1 and 2 is characterized in that, among the described step B, the element of described original sampling point array is a receiver gain control word sequence and corresponding to the receiver gain sequence of receiver gain control word sequence.
4, method according to claim 3 is characterized in that, the mapping relations of described automatic gain control table for setting up between receiver gain control word and receiver gain.
5. method according to claim 1, it is characterized in that, described step B further comprises: to the digital baseband signal sequence that receives through the FFT conversion and at frequency-domain calculations power, obtain the available power sequence of receiver, the difference of power sequence by calculating calibrating signal and the corresponding useful receiver power sequence that calculates through FFT again obtains the gain sequence of receiver.
6. according to any described method of claim 1-4, it is characterized in that described calibrating signal is for having the sinusoidal signal of certain frequency deviation with respect to carrier frequency.
7. the automatic gain control calibration table deriving means of a radio-frequency transmitter is characterized in that, comprising:
Signal receiving unit is used to receive the digital baseband signal sequence that obtains after the calibrating signal sequence process receiver conversion process;
The receiver gain arithmetic element is used for the digital baseband signal sequence that receives is carried out FFT frequency domain power calculation, obtains the gain sequence of receiver, and obtains being used to generate the original sampling point array of automatic gain control calibration table;
The automatic gain calibration table generates the unit, is used for described original sampling point array is carried out curve fitting, and generates and stores the automatic gain control calibration table.
8. device according to claim 7 is characterized in that, described device also comprises setup unit further, and described setup unit is used for setting the power sequence of receiver gain control word sequence and calibrating signal.
9. device according to claim 7, it is characterized in that, described receiver gain arithmetic element, be used for digital baseband signal sequence process FFT frequency domain power calculation further to receiving, obtain the available power sequence of receiver, the difference of power sequence by calculating calibrating signal and the corresponding useful receiver power sequence that calculates through FFT again obtains the gain sequence of receiver.
10. device according to claim 7 is characterized in that, the described element that is used to generate the original sampling point array of automatic gain control calibration table is a receiver gain control word sequence and corresponding to the receiver gain sequence of receiver gain control word sequence.
11. device according to claim 7 is characterized in that, described receiver gain arithmetic element comprises the FFT computing module, and described FFT computing module is used for calculating signal power in frequency domain.
12. device according to claim 7 is characterized in that, described calibrating signal is for having the sinusoidal signal of certain frequency deviation with respect to carrier frequency.
13. the automatic gain control calibration method of a radio-frequency transmitter is characterized in that, said method comprising the steps of:
Under calibration mode, receiver receives calibrating signal, and calibrating signal is handled signal afterwards through passage carry out the FFT conversion and at frequency-domain calculations power, generate and store the automatic gain control calibration table;
Under mode of operation, according to the size of received signal, receiver is searched corresponding gain in the automatic gain control table, and coming provides suitable gain for received signal.
14. method according to claim 13, it is characterized in that, described calibration mode is that receiver receives calibrating signal, and the digital baseband signal that calibrating signal carries out obtaining after passage is handled is carried out the FFT conversion and at frequency-domain calculations power, generates the automatic gain control calibration table thus.
15. method according to claim 13 is characterized in that, described mode of operation is the receiver received RF signal, and provides channel gain automatically in the process of radiofrequency signal being carried out the passage processing.
16. the automatic gain control calibration device of a radio-frequency transmitter is characterized in that, described device comprises:
Mode switch element is used for switching between the calibration mode of radio-frequency transmitter and mode of operation;
Automatic gain control calibration table acquiring unit under the calibration mode of radio-frequency transmitter, is used to generate and store the automatic gain control calibration table;
Search the unit, under the mode of operation of radio-frequency transmitter, be used to visit the automatic gain control calibration table, search the gain that adapts with the radio-frequency transmitter received signal;
The gain output unit is used for and will searches the passage processing section that radio-frequency transmitter is exported in gain that the unit obtains.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820898A (en) * | 2012-07-16 | 2012-12-12 | 深圳市海思半导体有限公司 | Gain regulation method and equipment |
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| CN103438921A (en) * | 2013-08-28 | 2013-12-11 | 杭州亿恒科技有限公司 | Method for calibrating sound pressure output and collecting channel based on DSP |
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| CN112866162A (en) * | 2021-01-05 | 2021-05-28 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Automatic gain control method, system and medium based on time domain and frequency domain power |
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2008
- 2008-09-18 CN CN200810149006XA patent/CN101359921B/en not_active Expired - Fee Related
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| CN103001597A (en) * | 2011-09-09 | 2013-03-27 | 联芯科技有限公司 | Gain frequency compensation method and gain frequency compensation device |
| CN103001597B (en) * | 2011-09-09 | 2015-08-19 | 联芯科技有限公司 | A kind of gain frequency compensation method and device |
| CN102820898B (en) * | 2012-07-16 | 2015-04-08 | 深圳市海思半导体有限公司 | Gain regulation method and equipment |
| CN102820898A (en) * | 2012-07-16 | 2012-12-12 | 深圳市海思半导体有限公司 | Gain regulation method and equipment |
| CN103438921A (en) * | 2013-08-28 | 2013-12-11 | 杭州亿恒科技有限公司 | Method for calibrating sound pressure output and collecting channel based on DSP |
| CN103438921B (en) * | 2013-08-28 | 2016-06-01 | 杭州亿恒科技有限公司 | A kind of acoustic pressure based on DSP exports and acquisition channel calibration steps |
| CN104753616B (en) * | 2013-12-30 | 2018-01-26 | 展讯通信（上海）有限公司 | The automatic gain control calibration method and apparatus of communication terminal |
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| CN105659548A (en) * | 2014-07-29 | 2016-06-08 | 华为技术有限公司 | Receiver and signal processing method |
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| CN105703823A (en) * | 2016-03-15 | 2016-06-22 | 成都广达新网科技股份有限公司 | Output level adjusting system and adjusting method for non-feedback light AGC light receiver |
| CN105703823B (en) * | 2016-03-15 | 2018-04-13 | 成都广达新网科技股份有限公司 | A kind of the output level adjustment system and adjusting process of feedback-less light AGC photoreceivers |
| CN109298657A (en) * | 2017-12-21 | 2019-02-01 | 上海创远仪器技术股份有限公司 | A method of time varying signal power detection and automatic growth control based on FPGA |
| WO2020124446A1 (en) * | 2018-12-19 | 2020-06-25 | 鹤壁天海电子信息系统有限公司 | Self-test circuit, self-test device and receiver |
| CN110161440A (en) * | 2019-04-29 | 2019-08-23 | 上海东软医疗科技有限公司 | A kind of receiver, signal acceptance method and MR imaging apparatus |
| CN110312300A (en) * | 2019-05-13 | 2019-10-08 | 展讯通信（上海）有限公司 | Control method, device and storage medium |
| CN112866162A (en) * | 2021-01-05 | 2021-05-28 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Automatic gain control method, system and medium based on time domain and frequency domain power |
| CN112866162B (en) * | 2021-01-05 | 2022-05-31 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Automatic gain control method, system and medium based on time domain and frequency domain power |
| CN114039566A (en) * | 2022-01-07 | 2022-02-11 | 中国人民解放军海军工程大学 | Anti-blocking interference automatic gain control circuit and control method |
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