CN102497341B - Method and system for local oscillator leakage calibration - Google Patents
Method and system for local oscillator leakage calibration Download PDFInfo
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- CN102497341B CN102497341B CN201110362393.7A CN201110362393A CN102497341B CN 102497341 B CN102497341 B CN 102497341B CN 201110362393 A CN201110362393 A CN 201110362393A CN 102497341 B CN102497341 B CN 102497341B
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Abstract
The invention discloses a method and a system for local oscillator leakage calibration, which are used for calibrating local oscillator leakage of existing hardware equipment, simplifying calibration of the local oscillator leakage, increasing calibration speed of the local oscillator leakage and improving the efficiency thereof and are adaptive to dynamic deviation of parameters including frequency, temperature and using time and the like. The method includes that a signal feedback circuit is coupled with to-be-transmitted signals of a transmitting antenna to obtain a coupled signal, and the coupled signal is fed back to a data processor after being filtered and subjected to analog-digital conversion and mixed with a local oscillator signal; the data processor confirms the present local oscillator leakage power according to the signals fed back by the signal feedback circuit, and the local oscillator leakage voltage adjusting width can be confirmed according to the present local oscillator leakage power and the target local oscillator leakage power, the present offset compensation voltage of an analog-digital converter is adjusted according to the local oscillator leakage voltage adjusting width until the difference of the present local oscillator leakage power and the target local oscillator leakage power is smaller than or equal to the set power threshold value.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of local oscillator leakage calibration steps and system.
Background technology
At present, at base station RRU (Radio Remote Unit, RF far-end module) in framework, often modulator is used in base station transmitter, inevitably local oscillator leakage may be introduced owing to there is many non-ideal factors in actual applications, differential transfer all can be caused to there is DC component as device discreteness, difference channel realize the non-ideal factors such as asymmetric, filtering capacity sense discreteness, this DC component may introduce local-oscillator leakage in conjunction with modulator frequency conversion.
For reducing local oscillator leakage in prior art, mainly in the following ways: modulator as shown in Figure 1 comprises digital to analog converter (the i.e. DAC connected successively, Digital-to-Analog Converter) 11, filter 12, modulator 13, at least one radio-frequency filter 14 and open-loop calibration instrument 15, wherein:
Digital to analog converter 11, for completing the digital-to-analogue conversion to intermediate frequency data, output orthogonal signal and in-phase signal;
Filter 12, the orthogonal signalling exported for logarithmic mode transducer 11 and in-phase signal are carried out image signal and are leached, the orthogonal signalling after output filtering and in-phase signal;
Modulator 13, modulates respectively for the orthogonal signalling that export filter 12 and in-phase signal;
Radio-frequency filter 14, for suppressing local oscillation signal, thus reaches the object reducing local-oscillator leakage;
Open-loop calibration instrument 15, for measuring local oscillation leak power thereof, and according to minimum step open loop repeating query calibration direct current, until the value of this open-loop calibration instrument measurement reaches target local oscillator leakage performance number position, determines comparatively suitable direct current biasing.
Although the calibration to local oscillator leakage can be realized above by multi-level radio-frequency filter 14 and open-loop calibration instrument 15, to make local oscillator leakage power reach desirable local oscillator leakage performance number, also bring following technological deficiency simultaneously:
(1) need to increase at least one radio-frequency filter in original base station transmitter, the situation that especially number of antennas is more needs to increase more radio-frequency filter, thus needs to consume larger hardware resource, improves cost;
(2) in base station transmitter, open-loop calibration instrument is introduced, therefore for the test fixture that the whole repeating query calibration process of open-loop calibration instrument needs exploitation corresponding, make calibration process be tending towards complicated, and occupy the longer production time in a calibration process, thus reduce production efficiency;
(3) frequency, temperature, service time three dimensions change under, the selected calibration of open-loop calibration instrument open loop repeating query calibration is biased can not Adaptive change, and the easy occurrence dynamics drift of just bias point, is unfavorable for the long-term work of equipment.
Summary of the invention
For the above-mentioned technical problem that prior art exists, the embodiment of the present invention provides a kind of local oscillator leakage calibration steps and system, to realize calibrating local oscillator leakage by existing hardware device, and simplify the complexity of local oscillator leakage calibration, improve the calibration speed of local oscillator leakage and efficiency, and adapt to frequency, temperature, service time isoparametric dynamic drift.
A kind of local oscillator leakage calibration system, comprise the data processor, digital to analog converter, the first filter, modulator and the transmitting antenna that connect successively, between described transmitting antenna and described data processor, be also connected with signal feedback circuit, this signal feedback circuit is coupled with described transmitting antenna;
Signal feedback circuit, the signal to be sent for the described transmitting antenna that is coupled obtains coupled signal, and after coupled signal and local oscillation signal are carried out mixing, after filtering, feeds back to described data processor after analog-to-digital conversion;
Described data processor, the signal for feeding back according to described signal feedback circuit determines current local oscillator leakage power; And, according to described current local oscillator leakage power and target local oscillator leakage power, determine this local oscillator leakage voltage-regulation width, and adjust, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter.
Preferably, described signal feedback circuit is connected with frequency mixer, the second filter and analog to digital converter from described transmitting antenna in turn to described data processor direction, wherein:
Described frequency mixer, for the be coupled coupled signal that obtains and local oscillation signal are carried out mixing, obtains mixed frequency signal and exports;
Second filter, carries out filtering for the mixed frequency signal exported described frequency mixer, and output filtering signal;
Analog to digital converter, carries out analog-to-digital conversion for the filtering signal exported described second filter, and the digital signal obtained is fed back to described digital processing unit.
Preferably, described data processor adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter, has particular application as:
In this local oscillator leakage voltage-regulation width range described, adjust by stepping according to the current bias bucking voltage of setting voltage stepping length to described digital to analog converter.
Preferably, described first filter comprises the first subfilter and the second subfilter, described first subfilter and the second subfilter are connected in parallel between described digital to analog converter and modulator, wherein, described digital to analog converter, the first subfilter form orthogonal link with described modulator, and described digital to analog converter, the second subfilter and described modulator form homophase link;
Described first subfilter carries out filtering to the orthogonal signalling that described digital to analog converter exports, and obtains filtered orthogonal signalling;
Described second subfilter carries out filtering to the in-phase signal that described digital to analog converter exports, and obtains filtered in-phase signal.
Preferably, described data processor adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter, has particular application as:
According to this local oscillator leakage voltage-regulation width described, current first bias compensation voltage corresponding with described orthogonal link in described digital to analog converter is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting; Or,
According to this local oscillator leakage voltage-regulation width described, current second bias compensation voltage corresponding with described homophase link in described digital to analog converter is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
Preferably, described data processor is further used for, in this local oscillator leakage voltage-regulation width range described, described current first bias compensation voltage is adjusted, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current second bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting;
Or, in this local oscillator leakage voltage-regulation width range described, described current second bias compensation voltage is adjusted, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current first bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
Preferably, be also connected with amplifier between described modulator and described transmitting antenna, described amplifier is used for amplifying the signal that described modulator exports.
Preferably, this local oscillator leakage voltage-regulation width determined by described data processor, has particular application as:
From the corresponding relation of the local oscillator leakage power pre-set, target local oscillator leakage power and local oscillator leakage voltage-regulation width, determine the local oscillator leakage voltage-regulation width corresponding with described current local oscillator leakage power, and the local oscillator leakage voltage-regulation width determined is defined as this local oscillator leakage voltage-regulation width.
The embodiment of the present invention also provides a kind of method adopting aforementioned local oscillator leakage calibration system to calibrate local oscillator leakage, and the method comprises:
The signal to be sent of signal feedback circuit coupling firing antenna obtains coupled signal, and after coupled signal and local oscillation signal are carried out mixing, after filtering, feeds back to data processor after analog-to-digital conversion;
Data processor determines current local oscillator leakage power according to the signal that described signal feedback circuit feeds back; And, according to described current local oscillator leakage power and target local oscillator leakage power, determine this local oscillator leakage voltage-regulation width, and adjust, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter.
Preferably, described data processor adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter, comprising:
In this local oscillator leakage voltage-regulation width range described, adjust by stepping according to the current bias bucking voltage of setting voltage stepping length to described digital to analog converter.
Preferably, first filter of described system comprises the first subfilter and the second subfilter, described first subfilter is in parallel with the second subfilter and be connected between described digital to analog converter and modulator, wherein, described digital to analog converter, the first subfilter form orthogonal link with described modulator, and described digital to analog converter, the second subfilter and described modulator form homophase link;
Described first subfilter carries out filtering to the orthogonal signalling that described digital to analog converter exports, and obtains filtered orthogonal signalling;
Described second subfilter carries out filtering to the in-phase signal that described digital to analog converter exports, and obtains filtered in-phase signal.
Preferably, described data processor adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter, has particular application as:
According to this local oscillator leakage voltage-regulation width described, current first bias compensation voltage corresponding with described orthogonal link in described digital to analog converter is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting; Or,
According to this local oscillator leakage voltage-regulation width described, current second bias compensation voltage corresponding with described homophase link in described digital to analog converter is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
Preferably, described method also comprises: described data processor adjusts described current first bias compensation voltage in this local oscillator leakage voltage-regulation width range described, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current second bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting;
Or, described data processor adjusts described current second bias compensation voltage in this local oscillator leakage voltage-regulation width range described, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current first bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
Preferably, this local oscillator leakage voltage-regulation width determined by described data processor, comprising:
From the corresponding relation of the local oscillator leakage power pre-set, target local oscillator leakage power and local oscillator leakage voltage-regulation width, determine the local oscillator leakage voltage-regulation width corresponding with described current local oscillator leakage power, and the local oscillator leakage voltage-regulation width determined is defined as this local oscillator leakage voltage-regulation width.
In the embodiment of the present invention, signal according to the signal feedback circuit feedback be connected between transmitting antenna and data processor determines current local oscillator leakage voltage, and determines this local oscillator leakage voltage-regulation width according to current local oscillator leakage power and target local oscillator leakage power; Adjust, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter again.Adopt technical solution of the present invention, on the one hand, the calibration to local oscillator leakage can be realized according to existing hardware device, do not need additionally to newly increase multiple radio-frequency filter and open-loop calibration instrument, save hardware resource, and not needing to carry out circulation by open-loop calibration instrument to measure, because this simplify the calibration to local oscillator leakage, thus improve speed and efficiency that local oscillator leakage is calibrated; On the other hand, adopt the mode of signal feedback to realize the calibration of local oscillator leakage, can adapt to frequency, temperature, service time isoparametric dynamic drift.
Accompanying drawing explanation
Fig. 1 is the structural representation of local oscillator leakage calibration system in prior art;
Fig. 2 is the structural representation of local oscillator leakage calibration system in the embodiment of the present invention;
Fig. 3 is one of structural representation of local oscillator leakage calibration system in practical application in the embodiment of the present invention;
Fig. 4 is the structural representation two of local oscillator leakage calibration system in the embodiment of the present invention;
Fig. 5 is the structural representation three of local oscillator leakage calibration system in the embodiment of the present invention;
Fig. 6 is the structural representation four of local oscillator leakage calibration system in the embodiment of the present invention;
Fig. 7 is the local oscillator leakage characteristic pattern of certain modulator in practical application scene in the embodiment of the present invention;
Fig. 8 is to the method flow diagram that local oscillator leakage is calibrated in the embodiment of the present invention.
Embodiment
For the above-mentioned technical problem that prior art exists, the embodiment of the present invention provides a kind of local oscillator leakage calibration steps and system, to realize calibrating local oscillator leakage by existing hardware device, and simplify the complexity of local oscillator leakage calibration, improve the calibration speed of local oscillator leakage and efficiency, and adapt to frequency, temperature, service time isoparametric dynamic drift.Local oscillator leakage calibration system, comprise the data processor, digital to analog converter, the first filter, modulator and the transmitting antenna that connect successively, between described transmitting antenna and described data processor, be also connected with signal feedback circuit, this signal feedback circuit is coupled with described transmitting antenna; Signal feedback circuit, the signal to be sent for the described transmitting antenna that is coupled obtains coupled signal, and after coupled signal and local oscillation signal are carried out mixing, after filtering, feeds back to described data processor after analog-to-digital conversion; Described data processor, the signal for feeding back according to described signal feedback circuit determines current local oscillator leakage power; And, according to described current local oscillator leakage power and target local oscillator leakage power, determine this local oscillator leakage voltage-regulation width, and adjust, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter.Adopt technical solution of the present invention, on the one hand, the calibration to local oscillator leakage can be realized according to existing hardware device, do not need additionally to newly increase multiple radio-frequency filter and open-loop calibration instrument, save hardware resource, and not needing to carry out circulation by open-loop calibration instrument to measure, because this simplify the calibration to local oscillator leakage, thus improve speed and efficiency that local oscillator leakage is calibrated; On the other hand, adopt the mode of signal feedback to realize the calibration of local oscillator leakage, can adapt to frequency, temperature, service time isoparametric dynamic drift.
Below in conjunction with Figure of description, technical solution of the present invention is described in detail.
See Fig. 2, for the structural representation of local oscillator leakage calibration system in the embodiment of the present invention, this system can comprise: the data processor 21 connected successively, digital to analog converter 22, first filter 23, modulator 24 and transmitting antenna 25, between described transmitting antenna 25 and described data processor 21, be also connected with signal feedback circuit 26, this signal feedback circuit 26 is coupled with described transmitting antenna 25; Wherein:
Data processor 21, exports after processing intermediate-freuqncy signal;
Digital to analog converter 22, carries out digital-to-analogue conversion for the signal exported described data processor 21, and outputting analog signal;
Filter 23, for the analog signal filtering image signal exported described digital to analog converter 22, and exports the analog signal after filtering image signal;
Modulator 24, is modulated for the analog signal exported described filter 23, and is launched by described transmitting antenna 24;
Signal feedback circuit 26, the signal to be sent for coupling firing antenna 25 obtains coupled signal, and after coupled signal and local oscillation signal are carried out mixing, after filtering, feeds back to described data processor after analog-to-digital conversion;
Data processor 21, determines current local oscillator leakage power for the signal fed back according to described signal feedback circuit 26; And, according to described current local oscillator leakage power and target local oscillator leakage power, determine this local oscillator leakage voltage-regulation width, and adjust, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter 22.As, the excursion of the bias compensation voltage before digital to analog converter 22 carries out digital translation when 16bit resolution is-10mA ~ 10mA.
Data processor 21 in the embodiment of the present invention can be DSP (Digital Signal Processing, digital signal processor), FPGA (Field Programmable Gate Array, field programmable gate array) etc.
Preferably, in conjunction with practical application, the signal feedback circuit 26 in the embodiment of the present invention can comprise to data processor 21 direction from transmitting antenna 25: be connected with frequency mixer 261, second filter 262 and analog to digital converter 263 in turn, as shown in Figure 3, wherein:
Frequency mixer 261, for the be coupled coupled signal that obtains and local oscillation signal are carried out mixing, obtains mixed frequency signal and exports;
Second filter 262, carries out filtering for the mixed frequency signal exported frequency mixer 261, and output filtering signal;
Analog to digital converter 263, carries out analog-to-digital conversion for the filtering signal exported the second filter 262, and the digital signal obtained is fed back to digital processing unit 21.
Preferably, data processor 21 adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter 22, can in the following ways:
In this local oscillator leakage voltage-regulation width range described, adjust by stepping according to the current bias bucking voltage of setting voltage stepping length to described digital to analog converter.
Preferably, for the situation needing output orthogonal signal and in-phase signal, the first filter 23 in the embodiment of the present invention can comprise the first subfilter 231 and the second subfilter 232, can be as shown in Figure 4, first subfilter 231 is in parallel with the second subfilter 232, and be connected between digital to analog converter 22 and modulator 24, wherein, described digital to analog converter 22, first subfilter 231 can form orthogonal link with modulator 24, and digital to analog converter 22, second subfilter 232 and modulator 24 can form homophase link;
The orthogonal signalling that first subfilter 231 logarithmic mode transducer 22 exports carry out filtering, obtain filtered orthogonal signalling;
The in-phase signal that second subfilter 232 logarithmic mode transducer 22 exports carries out filtering, obtains filtered in-phase signal.
Preferably, based on the system configuration shown in earlier figures 4, data processor 21 adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width logarithmic mode transducer 22 described, particularly can in the following ways:
Adjust, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting according to current first bias compensation voltage corresponding with described orthogonal link in this local oscillator leakage voltage-regulation width logarithmic mode transducer 22 described; Or,
Adjust, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting according to current second bias compensation voltage corresponding with described homophase link in this local oscillator leakage voltage-regulation width logarithmic mode transducer 22 described.
Preferably, for guaranteeing the success rate of calibrating local oscillator leakage further, appeal data processor 21 is further used for, in this local oscillator leakage voltage-regulation width range described, described current first bias compensation voltage is adjusted, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current second bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting,
Or, in this local oscillator leakage voltage-regulation width range described, described current second bias compensation voltage is adjusted, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current first bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
Preferably, for improving the effect of calibrating local oscillator leakage further, between modulator 24 and transmitting antenna 25, be also connected with amplifier 27, wherein amplifier 27 amplifies for the signal exported modulator 24.Amplifier 27 can be connected by modulator 24 in above-mentioned Fig. 2, Fig. 3 and Fig. 4 with between transmitting antenna 25.Be illustrated in figure 5 and be connected with amplifier 27 between the modulator 24 shown in Fig. 4 and transmitting antenna 25.
In the embodiment of the present invention, the concrete structure of the signal feedback circuit 26 shown in Fig. 4 and Fig. 5 can the structure of signal feedback circuit 26 as shown in Figure 3, is illustrated in figure 6 signal feedback circuit 26 shown in Fig. 5 and comprises frequency mixer 261, second filter 262 and analog to digital converter 263.
Preferably, this local oscillator leakage voltage-regulation width determined by data processor 21, has particular application as:
From the corresponding relation of the local oscillator leakage power pre-set, target local oscillator leakage power and local oscillator leakage voltage-regulation width, determine the local oscillator leakage voltage-regulation width corresponding with described current local oscillator leakage power, and the local oscillator leakage voltage-regulation width determined is defined as this local oscillator leakage voltage-regulation width.In the embodiment of the present invention, the corresponding relation of local oscillator leakage power, target local oscillator leakage power and local oscillator leakage voltage-regulation width can be arranged based on experience value, as shown in table 1.
Table 1 is local oscillator leakage power, target local oscillator leakage power and local oscillator leakage voltage-regulation width mapping table
| Local oscillator leakage power (dB) | Local oscillator leakage voltage-regulation width (uv) | Target local oscillator leakage power (dB) |
| -30 | 8000 | -70 |
| -40 | 2000 | -70 |
| -50 | 800 | -70 |
| -60 | 200 | -70 |
The initial value of local oscillation leak power thereof is about-40dBm, typical leaking performance as shown in Figure 7, setting local oscillator leakage voltage-regulation width is that Δ x (uv) is (as Δ x=2000uv, when voltage steps is 15uv, then can regulate about (2000/15) individual stepping), the excursion of local oscillation leak power thereof about-50dBm ~-35dBm, regulate direction can on homophase link and orthogonal link each adjustment ± Δ x.
In the embodiment of the present invention, except determining except local oscillator leakage voltage-regulation width according to the corresponding relation shown in table 1, also can determine to obtain according to under type:
Step 1, the maximum measuring the local oscillation leak power thereof obtained of supposing to be in course of adjustment are P2 (dBm), the bias voltage that P2 is corresponding is X2 (uv), it is P1 (dBm) that measurement obtains current local oscillation leak power thereof, can obtain bias voltage X1 (uv) corresponding to P1 according to following formula (1):
20*log (X2)-20*log (X1)=P2-P1 formula (1);
Step 2, target local oscillator leakage power P 3 (dBm) are-70dBm, P3-P1=Δ P=-30dB, and the bias voltage that can obtain target local oscillator leakage power P 3 correspondence according to formula (2) is X3 (uV):
20*log (X2)-20*log (X1)=P3-P1 formula (2);
Can obtain local oscillator leakage voltage-regulation width Delta x for (X3-X1) according to aforementioned X3 and X1 obtained, each voltage steps length is set to 15uv, then can obtain needs the step number of adjustment for (X3-X1)/15.A kind of method that the embodiment of the present invention also provides local oscillator leakage to calibrate, the method is based on aforementioned system, and method as shown in Figure 8, comprising:
The signal to be sent of step 801, signal feedback circuit 26 coupling firing antenna 25 obtains coupled signal, and after coupled signal and local oscillation signal are carried out mixing, after filtering, feeds back to data processor 21 after analog-to-digital conversion.
Step 802, data processor 21 determine current local oscillator leakage power according to the signal that described signal feedback circuit 26 feeds back.
Step 803, data processor 21 are according to described current local oscillator leakage power and target local oscillator leakage power, determine this local oscillator leakage voltage-regulation width, and adjust, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter.
Preferably, in above-mentioned process step 803, data processor 21 adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter 22, comprising:
In this local oscillator leakage voltage-regulation width range described, adjust by stepping according to the current bias bucking voltage of setting voltage stepping length to described digital to analog converter 22.
Preferably, first filter 23 of described system comprises the first subfilter 231 and the second subfilter 232, described first subfilter 231 is in parallel with the second subfilter 232 and be connected between described digital to analog converter 22 and modulator 24, wherein, described digital to analog converter 22, first subfilter 231 forms orthogonal link with described modulator 24, and described digital to analog converter 22, second subfilter 232 forms homophase link with described modulator 24;
Described first subfilter 231 carries out filtering to the orthogonal signalling that described digital to analog converter 22 exports, and obtains filtered orthogonal signalling;
Described second subfilter 232 carries out filtering to the in-phase signal that described digital to analog converter 22 exports, and obtains filtered in-phase signal.
Preferably, in above-mentioned process step 803, data processor 21 adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter 22, has particular application as:
According to this local oscillator leakage voltage-regulation width described, current first bias compensation voltage corresponding with described orthogonal link in described digital to analog converter 22 is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting; Or,
According to this local oscillator leakage voltage-regulation width described, current second bias compensation voltage corresponding with described homophase link in described digital to analog converter 22 is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
Preferably, in above-mentioned process step 803, also step can be comprised:
Described data processor 21 adjusts described current first bias compensation voltage in this local oscillator leakage voltage-regulation width range described, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current second bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting;
Or, described data processor 21 adjusts described current second bias compensation voltage in this local oscillator leakage voltage-regulation width range described, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current first bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
Preferably, in above-mentioned process step 803, this local oscillator leakage voltage-regulation width determined by data processor 21, comprising:
From the corresponding relation of the local oscillator leakage power pre-set, target local oscillator leakage power and local oscillator leakage voltage-regulation width, determine the local oscillator leakage voltage-regulation width corresponding with described current local oscillator leakage power, and the local oscillator leakage voltage-regulation width determined is defined as this local oscillator leakage voltage-regulation width.
In the embodiment of the present invention, on the one hand, the calibration to local oscillator leakage can be realized according to existing hardware device, do not need additionally to newly increase multiple radio-frequency filter and open-loop calibration instrument, save hardware resource, and not needing to carry out circulation by open-loop calibration instrument to measure, because this simplify the calibration to local oscillator leakage, thus improve speed and efficiency that local oscillator leakage is calibrated; On the other hand, adopt the mode of signal feedback to realize the calibration of local oscillator leakage, can adapt to frequency, temperature, service time isoparametric dynamic drift.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (14)
1. a local oscillator leakage calibration system, comprise the data processor, digital to analog converter, the first filter, modulator and the transmitting antenna that connect successively, it is characterized in that, between described transmitting antenna and described data processor, be also connected with signal feedback circuit, this signal feedback circuit is coupled with described transmitting antenna;
Signal feedback circuit, the signal to be sent for the described transmitting antenna that is coupled obtains coupled signal, and after coupled signal and local oscillation signal are carried out mixing, after filtering, feeds back to described data processor after analog-to-digital conversion;
Described data processor, the signal for feeding back according to described signal feedback circuit determines current local oscillator leakage power; And, according to described current local oscillator leakage power and target local oscillator leakage power, determine this local oscillator leakage voltage-regulation width, and adjust, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter;
Wherein, described data processor, according to described current local oscillator leakage power and target local oscillator leakage power, determines this local oscillator leakage voltage-regulation width in the following manner:
Bias voltage corresponding to current local oscillation leak power thereof is obtained according to following formula
20*log(X2)-20*log(X1)＝P2-P1；
Bias voltage corresponding to target local oscillation leak power thereof is obtained according to following formula
20*log(X3)-20*log(X1)＝P3-P1；
This local-oscillator leakage voltage-regulation width is obtained according to following formula
Δx＝X3-X1；
Wherein, P1 is current local oscillation leak power thereof, P2 is the maximum measuring the local oscillation leak power thereof obtained in adjustment process, P3 is target local oscillation leak power thereof, X1 is the bias voltage that P1 is corresponding, X2 is the bias voltage that P2 is corresponding, and X3 is the bias voltage that P3 is corresponding, and Δ x is local-oscillator leakage voltage-regulation width.
2. the system as claimed in claim 1, is characterized in that, described signal feedback circuit is connected with frequency mixer, the second filter and analog to digital converter from described transmitting antenna in turn to described data processor direction, wherein:
Described frequency mixer, for the be coupled coupled signal that obtains and local oscillation signal are carried out mixing, obtains mixed frequency signal and exports;
Second filter, carries out filtering for the mixed frequency signal exported described frequency mixer, and output filtering signal;
Analog to digital converter, carries out analog-to-digital conversion for the filtering signal exported described second filter, and the digital signal obtained is fed back to described digital processing unit.
3. the system as claimed in claim 1, is characterized in that, described data processor adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter, has particular application as:
In this local oscillator leakage voltage-regulation width range described, adjust by stepping according to the current bias bucking voltage of setting voltage stepping length to described digital to analog converter.
4. the system as claimed in claim 1, it is characterized in that, described first filter comprises the first subfilter and the second subfilter, described first subfilter and the second subfilter are connected in parallel between described digital to analog converter and modulator, wherein, described digital to analog converter, the first subfilter form orthogonal link with described modulator, and described digital to analog converter, the second subfilter and described modulator form homophase link;
Described first subfilter carries out filtering to the orthogonal signalling that described digital to analog converter exports, and obtains filtered orthogonal signalling;
Described second subfilter carries out filtering to the in-phase signal that described digital to analog converter exports, and obtains filtered in-phase signal.
5. system as claimed in claim 4, it is characterized in that, described data processor adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter, has particular application as:
According to this local oscillator leakage voltage-regulation width described, current first bias compensation voltage corresponding with described orthogonal link in described digital to analog converter is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting; Or,
According to this local oscillator leakage voltage-regulation width described, current second bias compensation voltage corresponding with described homophase link in described digital to analog converter is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
6. system as claimed in claim 5, it is characterized in that, described data processor is further used for, in this local oscillator leakage voltage-regulation width range described, described current first bias compensation voltage is adjusted, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current second bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting,
Or, in this local oscillator leakage voltage-regulation width range described, described current second bias compensation voltage is adjusted, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current first bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
7. the system as claimed in claim 1, is characterized in that, is also connected with amplifier between described modulator and described transmitting antenna, and described amplifier is used for amplifying the signal that described modulator exports.
8. the system as claimed in claim 1, is characterized in that, this local oscillator leakage voltage-regulation width determined by described data processor, has particular application as:
From the corresponding relation of the local oscillator leakage power pre-set, target local oscillator leakage power and local oscillator leakage voltage-regulation width, determine the local oscillator leakage voltage-regulation width corresponding with described current local oscillator leakage power, and the local oscillator leakage voltage-regulation width determined is defined as this local oscillator leakage voltage-regulation width.
9. the method adopting the system as claimed in claim 1 to calibrate local oscillator leakage, is characterized in that, comprising:
The signal to be sent of signal feedback circuit coupling firing antenna obtains coupled signal, and after coupled signal and local oscillation signal are carried out mixing, after filtering, feeds back to data processor after analog-to-digital conversion;
Data processor determines current local oscillator leakage power according to the signal that described signal feedback circuit feeds back; And, according to described current local oscillator leakage power and target local oscillator leakage power, determine this local oscillator leakage voltage-regulation width, and adjust, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter;
Wherein, according to described current local oscillator leakage power and target local oscillator leakage power, determine this local oscillator leakage voltage-regulation width in the following manner:
Bias voltage corresponding to current local oscillation leak power thereof is obtained according to following formula
20*log(X2)-20*log(X1)＝P2-P1；
Bias voltage corresponding to target local oscillation leak power thereof is obtained according to following formula
20*log(X3)-20*log(X1)＝P3-P1；
This local-oscillator leakage voltage-regulation width is obtained according to following formula
Δx＝X3-X1；
Wherein, P1 is current local oscillation leak power thereof, P2 is the maximum measuring the local oscillation leak power thereof obtained in adjustment process, P3 is target local oscillation leak power thereof, X1 is the bias voltage that P1 is corresponding, X2 is the bias voltage that P2 is corresponding, and X3 is the bias voltage that P3 is corresponding, and Δ x is local-oscillator leakage voltage-regulation width.
10. method as claimed in claim 9, it is characterized in that, described data processor adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter, comprising:
In this local oscillator leakage voltage-regulation width range described, adjust by stepping according to the current bias bucking voltage of setting voltage stepping length to described digital to analog converter.
11. methods as claimed in claim 9, it is characterized in that, first filter of described system comprises the first subfilter and the second subfilter, described first subfilter is in parallel with the second subfilter and be connected between described digital to analog converter and modulator, wherein, described digital to analog converter, the first subfilter form orthogonal link with described modulator, and described digital to analog converter, the second subfilter and described modulator form homophase link;
Described first subfilter carries out filtering to the orthogonal signalling that described digital to analog converter exports, and obtains filtered orthogonal signalling;
Described second subfilter carries out filtering to the in-phase signal that described digital to analog converter exports, and obtains filtered in-phase signal.
12. methods as claimed in claim 11, is characterized in that, described data processor adjusts according to the current bias bucking voltage of this local oscillator leakage voltage-regulation width described to described digital to analog converter, has particular application as:
According to this local oscillator leakage voltage-regulation width described, current first bias compensation voltage corresponding with described orthogonal link in described digital to analog converter is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting; Or,
According to this local oscillator leakage voltage-regulation width described, current second bias compensation voltage corresponding with described homophase link in described digital to analog converter is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
13. methods as claimed in claim 12, is characterized in that, also comprise:
Described data processor adjusts described current first bias compensation voltage in this local oscillator leakage voltage-regulation width range described, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current second bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting;
Or, described data processor adjusts described current second bias compensation voltage in this local oscillator leakage voltage-regulation width range described, when the difference of described current local oscillator leakage power and described target local oscillator leakage power is all greater than the power threshold of setting, according to this local oscillator leakage voltage-regulation width described, described current first bias compensation voltage is adjusted, until the difference of described current local oscillator leakage power and described target local oscillator leakage power is less than or equal to the power threshold of setting.
14. methods as claimed in claim 9, is characterized in that, this local oscillator leakage voltage-regulation width determined by described data processor, comprising:
From the corresponding relation of the local oscillator leakage power pre-set, target local oscillator leakage power and local oscillator leakage voltage-regulation width, determine the local oscillator leakage voltage-regulation width corresponding with described current local oscillator leakage power, and the local oscillator leakage voltage-regulation width determined is defined as this local oscillator leakage voltage-regulation width.
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| CN107819712A (en) * | 2016-09-12 | 2018-03-20 | 中兴通讯股份有限公司 | Local-oscillator leakage automatic calibrating method and device |
| CN106850083B (en) * | 2017-03-24 | 2020-02-07 | 京信通信系统（中国）有限公司 | Method for inhibiting local oscillator leakage signal, circuit board and communication equipment |
| 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 |
| CN108347285B (en) * | 2017-12-26 | 2021-10-12 | 三维通信股份有限公司 | Signal correction system and method for full-bandwidth zero-intermediate-frequency transmitter |
| US10903567B2 (en) * | 2018-06-04 | 2021-01-26 | Infineon Technologies Ag | Calibrating a phased array system |
| CN111181594A (en) * | 2019-12-17 | 2020-05-19 | 上海交通大学 | Transmitting local oscillator leakage digital calibration system and method based on radio frequency receiving and transmitting chip |
| CN111313920B (en) * | 2020-02-19 | 2021-12-03 | 特金智能科技(上海)有限公司 | Zero intermediate frequency receiver, signal processing method and device thereof, electronic device and medium |
| CN114745063B (en) * | 2022-06-10 | 2022-08-16 | 中星联华科技（北京）有限公司 | Local oscillator leakage calibration method and system based on grid sampling and extreme value acquisition |
| CN115543059B (en) * | 2022-11-30 | 2023-03-07 | 飞腾信息技术有限公司 | Processor, processor system and system on chip |
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