CN101626355B - Calibration device and calibration method of multi-input multi-output (MIMO) terminal - Google Patents
Calibration device and calibration method of multi-input multi-output (MIMO) terminal Download PDFInfo
- Publication number
- CN101626355B CN101626355B CN200910090874XA CN200910090874A CN101626355B CN 101626355 B CN101626355 B CN 101626355B CN 200910090874X A CN200910090874X A CN 200910090874XA CN 200910090874 A CN200910090874 A CN 200910090874A CN 101626355 B CN101626355 B CN 101626355B
- Authority
- CN
- China
- Prior art keywords
- distortion
- module
- power amplifier
- power
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The invention provides a calibration device and a calibration method of a multi-input multi-output (MIMO) terminal. The calibration device comprises a second antenna port, a feedback module, a radio frequency receiving module, a comparison module, a distortion degree determination module and a predistortion treatment module, wherein the feedback module is used for feeding back an output signal of a radio frequency emission module to the second antenna port; the radio frequency receiving module is used for obtaining a digitized feedback signal; the comparison module is used for comparing the feedback signal with an input signal and determining whether a power amplifier works in a nonlinear area or not according to a comparison result; the distortion degree determination module is used for determining the distortion degree of the feedback signal when the power amplifier works in the nonlinear area; and the predistortion treatment module is used for adjusting a predistortion coefficient according to the distortion degree when the power amplifier works in the nonlinear area so as to obtain a calibrated predistortion coefficient. The calibration device can be utilized to calibrate a predistortion coefficient lookup table so as to ensure that the MIMO terminal can carry out predistortion treatment by utilizing the calibrated predistortion coefficient lookup table in a working process so as to improve the linear performance of the power amplifier.
Description
Technical field
The present invention relates to moving communicating field, particularly relate to a kind of multiple-input and multiple-output (Multiple-InputMultiple-Output, MIMO) calibrating installation at terminal and calibration steps.
Background technology
At moving communicating field, 3GPP Long Term Evolution LTE technology is being represented the direction of the follow-up evolution of 3G because of it, pays close attention to and receive widely.LTE requires power amplifier on wideer frequency band, to realize high linearisation to the support of variable channel bandwidth, and the application of OFDM technology in LTE also can improve the peak-to-average force ratio of whole system greatly, these all the linearity of pair amplifier have higher requirement.In addition, the modulation systems of using among the LTE such as 64QAM also all have higher requirement to the system linearity degree.From above analysis, we can find in the design of LTE system, to improve as much as possible the system linearity degree is very significant.
In the prior art, realize that the linearizing method of RF power amplification is a lot, common has following three kinds: back-off method, feed forward approach and pre-distortion method.
It is the efficient and the linearity that the back-off method has been introduced a pair of paradox; Must find a suitable balance point by between, it is equivalent to do low power tube to the bigger pipe of power uses, and the efficient of sacrificing power amplifier improves the linearity; The efficient of power amplifier greatly reduces; It has certain limitation in addition, when back-off arrives to a certain degree, continues the linearity that rollback will no longer improve amplifier.
When feed forward approach is used for the output calibration; Because the power level of output signal is bigger; Come calibrating signal is amplified with regard to introducing a better power amplifier of the linearity like this, otherwise calibration is just nonsensical, need obtains accurate amplitude, phase place and time delay coupling in addition; Otherwise just can not offset fully, introduce error.
The essence of pre-distortion method is exactly before power amplifier, to increase a nonlinear circuit non-linear with compensating power amplifier, and base band predistortion can be realized with digital circuit because operating frequency is low, be a focus of current research.Digital predistorter is made up of a vector gain adjuster; It can be according to look-up table (LUT; Look-Up-Table) content is come the amplitude and the phase place of control input signals; And and then the size of control predistortion, thereby a nonlinear characteristic opposite with power amplifier is provided so that input signal and power amplifier are exported the difference minimum of signal.There is not stability problem in digital predistorter, wideer signal band is arranged, can handles the signal that contains multicarrier.But; The inventor finds in realizing process of the present invention; Pre-distortion technology is difficult to be applied to early stage portable terminal, and one of them major reason is to use pre-distortion technology in the portable terminal in early days need add an extra receiver, and this has increased the cost at terminal.
Summary of the invention
The calibrating installation and the calibration steps that the purpose of this invention is to provide a kind of multi-input multi-output (MIMO) terminal utilize pre-distortion technology to improve the technical problem of system linearity performance in portable terminal to solve.
To achieve these goals; The invention provides a kind of calibrating installation of multi-input multi-output (MIMO) terminal; Said multiple-input and multiple-output MIMO terminal comprises: first antenna opening, and the radiofrequency emitting module that is connected with said first antenna opening, and said radiofrequency emitting module comprises power amplifier; Wherein, said MIMO terminal also comprises:
The pre-distortion module; Be connected with the input of said radiofrequency emitting module; When being used for being in the course of work and said power amplifier and being operated in nonlinear area at said MIMO terminal; Before said input signal is imported said radiofrequency emitting module, from preset pre-distortion coefficients look-up table, obtain and the corresponding pre-distortion coefficients of said power amplifier current output power, and said input signal is carried out pre-distortion according to the said pre-distortion coefficients of obtaining; Said pre-distortion coefficients look-up table comprises: the power output of said power amplifier and the corresponding relation between the pre-distortion coefficients;
Said calibrating installation is used for before said MIMO terminal works, obtaining the pre-distortion coefficients look-up table of calibration, comprising:
Second antenna opening;
Feedback module is used for the radiofrequency signal of said radiofrequency emitting module output is fed back to said second antenna opening through said first antenna opening;
Receiver Module is used for the said signal that feeds back to said second antenna opening is carried out down-conversion and analog-to-digital conversion, obtains the digitized feedback signal of said radiofrequency emitting module output radiofrequency signal;
Comparison module is used for the feedback signal of more said Receiver Module output and the input signal of said pre-distortion module, and confirms according to result relatively whether said power amplifier is operated in nonlinear area;
Distortion size determination module is used for when said power amplifier is operated in nonlinear area, confirms the distortion size of said feedback signal with respect to the input signal of said pre-distortion module;
Said pre-distortion module; Be further used for when said power amplifier is operated in nonlinear area; According to the distortion size that said distortion size determination module is confirmed, adjust said pre-distortion coefficients, until obtaining making the calibration pre-distortion coefficients of said distortion size in preset distortion range.
Preferably, described calibrating installation, wherein, the power output of the said power amplifier in the said pre-distortion coefficients look-up table and the corresponding relation between the said pre-distortion coefficients are:
The value of the power control word APC at said MIMO terminal and the corresponding relation between the said pre-distortion coefficients.
Preferably, described calibrating installation, wherein, said pre-distortion coefficients comprises: the phase adjusted coefficient of said power amplifier and at least one in the accommodation coefficient of gain.
Preferably, described calibrating installation, wherein, said second antenna opening is in a plurality of antenna opening of comprising of said MIMO terminal, other antenna opening except that said first antenna opening; Said Receiver Module is and the corresponding Receiver Module of said second antenna opening.
Preferably, described calibrating installation, wherein,
Said feedback module comprises:
The merit sub-module is connected with said first antenna opening, is used for the radiofrequency signal of said radiofrequency emitting module output is divided into two same signals;
Power conditioning module is used for receiving a road of said two-way same signal, one road signal of said reception is carried out power adjustments, and the signal after the said adjusting is imported said Receiver Module;
Said distortion size determination module is imported on another road in the said two paths of signals.
Preferably, described calibrating installation, wherein, said distortion size determination module passes through to analyze the value of the adjacent channel power of said feedback signal than ACPR, confirms the distortion size of said feedback signal.
On the other hand, a kind of calibration steps of multi-input multi-output (MIMO) terminal is provided, said multiple-input and multiple-output MIMO terminal comprises: first antenna opening; And the radiofrequency emitting module that is connected with said first antenna opening; Said radiofrequency emitting module comprises power amplifier, wherein
Said MIMO terminal also comprises:
Second antenna opening;
The Receiver Module that is connected with said second antenna opening;
The pre-distortion module; Be connected with the input of said radiofrequency emitting module; When being used for being in the course of work and said power amplifier and being operated in nonlinear area at said MIMO terminal; Before said input signal is imported said radiofrequency emitting module, from preset pre-distortion coefficients look-up table, obtain and the corresponding pre-distortion coefficients of said power amplifier current output power, and said input signal is carried out pre-distortion according to the said pre-distortion coefficients of obtaining; Said pre-distortion coefficients look-up table comprises: the power output of said power amplifier and the corresponding relation between the pre-distortion coefficients;
Said calibration steps is used for before said MIMO terminal works, said pre-distortion coefficients look-up table being calibrated, and said calibration steps comprises the steps:
Steps A; The radiofrequency signal of said radiofrequency emitting module output is fed back to said second antenna opening through said first antenna opening; And the said signal that feeds back to said second antenna opening is carried out down-conversion and analog-to-digital conversion through said Receiver Module, obtain the digitized feedback signal that said radiofrequency emitting module transmits;
Step B; The input signal of more said feedback signal and said pre-distortion module; If said power amplifier is operated in nonlinear area; Then adjust said pre-distortion coefficients,, preserve the power output and the calibration pre-distortion coefficients corresponding of said power amplifier with said power output until obtaining making the calibration pre-distortion coefficients of distortion size in preset range of said feedback signal with respect to the input signal of said pre-distortion module.
Preferably, described calibration steps, wherein, the power output of the said power amplifier in the said pre-distortion coefficients look-up table and the corresponding relation between the said pre-distortion coefficients are:
The value of the power control word APC at said MIMO terminal and the corresponding relation between the said pre-distortion coefficients;
Among the said step B, the power output of the said power amplifier of said preservation and the calibration pre-distortion coefficients corresponding with said power output are:
Preserve the value of the power control word APC corresponding and corresponding calibration pre-distortion coefficients with the power output of said power amplifier.
Preferably; Described calibration steps; Wherein, Among the said step B, the adjacent channel power through judging said feedback signal than the value of ACPR whether in preset scope, confirm said feedback signal with respect to the distortion size of the input signal of said pre-distortion module whether in the scope of presetting.
Preferably, described calibration steps wherein, also comprises before the said steps A: the step that the radiofrequency signal of said radiofrequency emitting module output is divided into identical two-way;
Said second antenna opening of leading up in the said two-way feeds back to said Receiver Module, and another road in the said two-way is used for confirming the distortion size of said feedback signal.
Preferably, described calibration steps, wherein, said step B also comprises:
Adjust the output power range of said power amplifier; With in the non-linear power output zone that obtains said power amplifier, calibration pre-distortion coefficients that different output power point is corresponding, and utilize the corresponding calibration pre-distortion coefficients of said different output power point to generate the pre-distortion coefficients look-up table of calibrating.
Preferably, described calibration steps, wherein, the value of the power control word APC through adjusting said MIMO terminal is adjusted the output power range of said power amplifier.
Preferably, described calibration steps wherein, behind the pre-distortion coefficients look-up table that generates said calibration, in the course of work at said MIMO terminal, also comprises:
Step a obtains the power output of said power amplifier;
Step b; When said power amplifier is operated in nonlinear area; Said pre-distortion module is according to the power output of said power amplifier; From the pre-distortion coefficients look-up table of said calibration, obtain and the corresponding pre-distortion coefficients of said power amplifier current output power, and the input signal of said pre-distortion module is carried out pre-distortion, and the signal after the said pre-distortion is imported said radiofrequency emitting module launch according to the said pre-distortion coefficients of obtaining.
A technical scheme in the technique scheme has following technique effect:
Through the pre-distortion module is set in the MIMO terminal; And the pre-distortion coefficients in the pre-distortion coefficients look-up table that before the MIMO terminal works, the pre-distortion module is used is calibrated; When power amplifier is operated in nonlinear area, before baseband signal input radio frequency transmitter module, from the pre-distortion coefficients look-up table of calibration, obtain and the corresponding pre-distortion coefficients of power amplifier current output power; And according to the pre-distortion coefficients of obtaining to the input baseband signal carry out pre-distortion; Can improve the linear properties of power amplifier, thereby improve the linear properties of MIMO terminal system, satisfy the requirement of LTE the power amplifier high linearity.
Description of drawings
Fig. 1 is the structural representation at the MIMO terminal of the embodiment of the invention;
Fig. 2 is the structural representation of calibrating installation at the MIMO terminal of the embodiment of the invention;
Fig. 3 is a principle schematic of utilizing the calibrating installation of the embodiment of the invention that the MIMO terminal of the embodiment of the invention is calibrated;
Fig. 4 is the schematic flow sheet of calibration steps at the MIMO terminal of the embodiment of the invention;
Fig. 5 is after utilizing the calibration steps of the embodiment of the invention to generate the pre-distortion coefficients look-up table LUT of calibration, the schematic flow sheet of MIMO terminal RF transmission method in the course of the work;
Fig. 6 carries out the operation principle sketch map of radio-frequency transmissions for the MIMO terminal utilizes LUT after the calibration.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and specific embodiment to describe the present invention below.
The inventor finds multiple-input and multiple-output in realizing process of the present invention (Multiple-InputMultiple-Output, MIMO) technology is applied in LTE as a key technology.The MIMO technology has lot of advantages: can be under the situation that does not increase channel width, and the capacity of increase system at double, thus effectively improved the availability of frequency spectrum of system; Can also improve the quality of signal transmission through a minute collection.The inventor has developed other a kind of application of MIMO in the present invention, based on a kind of method of improving radio frequency sender linear properties of MIMO technology proposition.The inventor finds in realizing process of the present invention: for early stage portable terminal; The major reason that pre-distortion technology is difficult to be applied is that it need add an extra receiver; This has increased the cost at terminal; And in the MIMO multiaerial system, not needing to add in addition receiver, this maybe with regard to providing for the application of predistortion.
Fig. 1 is the structural representation at the MIMO terminal of the embodiment of the invention.Like Fig. 1, this MIMO terminal comprises:
Exemplarily; Because the MIMO terminal can be according to automated power control word (the AutomaticPower Control that stores in advance; APC) value is confirmed the transmitting power of radiofrequency emitting module; And and then obtain the output power value of power amplifier; Be the power output that the value of APC can the indicated horsepower amplifier, so the value of the power control word APC that the power output of the power amplifier in the pre-distortion coefficients look-up table and the corresponding relation between the pre-distortion coefficients can be through the MIMO terminals and the corresponding relation between the said pre-distortion coefficients are represented.
Preferably; When what store among the pre-distortion coefficients look-up table LUT be: when the value of APC and the corresponding relation between the pre-distortion coefficients; The pre-distortion module is when carrying out pre-distortion; Obtain the value of APC, and from LUT, find out the pre-distortion coefficients corresponding and carry out pre-distortion with the value of the APC that obtains.
Embodiments of the invention provide a kind of MIMO terminal that is provided with the pre-distortion module; The MIMO terminal of this embodiment, in the course of the work, through obtaining the power output of power amplifier; When power amplifier is operated in nonlinear area; Through searching preset pre-distortion coefficients look-up table LUT, confirm and the corresponding pre-distortion coefficients of current power amplifier power output, come the input signal of input pre-distortion module is carried out pre-distortion; Can improve the linear properties of power amplifier, and then improve the linear properties of this mimo system radiofrequency emitting module such as radio frequency sender.Wherein, the value of the APC that the power output of current power amplifier can be through obtaining the MIMO terminal obtains.
Preferably, the pre-distortion coefficients look-up table stores is in the memory module at MIMO terminal.
The pre-distortion coefficients of preferably, storing in the pre-distortion coefficients look-up table comprises: the phase adjusted coefficient of power amplifier and at least one in the accommodation coefficient of gain.Exemplarily, the pre-distortion coefficients look-up table comprises two bivariate tables: phase adjusted coefficient-wattmeter and accommodation coefficient of gain-wattmeter.In MIMO terminal works process, be phase distortion or gain distortions according to the output of power amplifier, select respective phase adjustment factor and/or accommodation coefficient of gain to come input signal is carried out pre-distortion.
Exemplarily, in concrete the realization, the pre-distortion module of the embodiment of the invention existing multiple predistorter capable of using is realized like multiple digital baseband predistorter.The pre-distortion module comprises: by the vector gain adjuster of FIR filter realization.The vector gain adjuster is adjusted the distortion size of phase of input signals and/or gain through the FIR coefficient of revising the FIR filter.
Preferably, the pre-distortion coefficients in the pre-distortion coefficients look-up table in the MIMO terminal of the embodiment of the invention is the pre-distortion coefficients look-up table through calibration.Exemplarily, the LUT of this calibration obtains through the calibration process of separating with the course of work at MIMO terminal.Concrete, as can before dispatching from the factory in the MIMO terminal, calibrating.
Because the MIMO terminal has many antennas; When the LUT to the MIMO of the embodiment of the invention calibrates; An antenna at MIMO capable of using terminal carries out radio-frequency transmissions; And the antenna opening through this transmitting antenna, and utilize the antenna opening of another antenna and corresponding radio-frequency transmitter to come to obtain easily the feedback signal of the radiofrequency signal of radio frequency sending set output, thus can make things convenient for, accurately realize calibration to LUT.
Fig. 2 shows the structural representation that is used for the calibrating installation that the pre-distortion coefficients look-up table LUT to the MIMO terminal of the embodiment of the invention calibrates.The calibrating installation of the embodiment of the invention is used for before the MIMO terminal works, obtains the pre-distortion coefficients look-up table of setting, and the predistortion of its setting is searched coefficient table calibrate.Among Fig. 2, show the annexation at calibrating installation and MIMO terminal simultaneously.Like Fig. 2, this calibrating installation comprises: second antenna opening 201; Feedback module 202 is used for the radiofrequency signal of radiofrequency emitting module output is fed back to second antenna opening through first antenna opening; Receiver Module 203; Be connected with second antenna opening; Be used to receive the signal that feeds back to said second antenna opening, the signal of said reception is carried out down-conversion and analog-to-digital conversion, obtain the digitized feedback signal of the radiofrequency signal of said radiofrequency emitting module output; Comparison module 204 is used for the feedback signal of comparison Receiver Module output and the input signal of pre-distortion module, and confirms according to result relatively whether said power amplifier is operated in nonlinear area; Distortion size determination module 205 is used for when said power amplifier is operated in nonlinear area, confirms the distortion size of said feedback signal with respect to the input signal of said pre-distortion module; Above-mentioned pre-distortion module; Be further used for when power amplifier is operated in nonlinear area; According to the distortion size that said distortion size determination module is confirmed, the adjustment pre-distortion coefficients is until the calibration pre-distortion coefficients of distortion size in preset distortion range that obtains making said feedback signal; And the power output and the calibration pre-distortion coefficients corresponding with the power output of said power amplifier of preserving said power amplifier, to generate the pre-distortion coefficients look-up table of calibration.
Should be understood that; Because it is very near that two antennas at MIMO terminal leave; Belong to the near field; An antenna can not obtain signal from the antenna adjacent with it, so when the calibrating installation that utilizes the embodiment of the invention was calibrated, the radiofrequency signal of feedback was that the antenna opening of never buckling before the antenna is that antenna port obtains.
Preferably, the power output of above-mentioned preservation power amplifier and the calibration pre-distortion coefficients corresponding with said power output are: the value of the power control word APC that preservation and the power output of said power amplifier are corresponding and corresponding calibration pre-distortion coefficients.
The calibrating installation of the embodiment of the invention utilizes many antennas characteristics at MIMO terminal accurately to obtain the feedback signal of radio frequency transmissions, to calibrate.Preferably, in the antenna opening of a plurality of antennas that above-mentioned second antenna opening comprises for the MIMO terminal, other antenna opening except that said first antenna opening; Above-mentioned state Receiver Module be in the MIMO terminal with the corresponding radio-frequency transmitter of above-mentioned second antenna opening.
Preferably, above-mentioned comparison module, existing multiple signal comparator capable of using is realized.Exemplarily, above-mentioned comparison module can confirm whether power amplifier is operated in the linear zone through the signal difference between the input signal of judging feedback signal and pre-distortion module whether less than preset threshold value; Wherein, when said signal difference during, confirm that power amplifier is operated in the range of linearity less than preset threshold value; Otherwise, be operated in nonlinear area.
Fig. 3 is a principle schematic of utilizing calibrating installation shown in Figure 2 that the MIMO terminal of the embodiment of the invention is calibrated.Like Fig. 3, in this routine calibrating installation, feedback module also comprises: the merit sub-module that is connected with first antenna opening, the power regulation module that is connected with the merit sub-module.In this example, distortion size determination module is embodied as spectrum analysis module.The merit sub-module; Like power splitter, be used for the output signal of power amplifier being divided into two same signals, the two paths of signals of output; One the tunnel receives power regulation module such as power attenuator; By power regulation module this road signal of its reception is carried out the power adjustment, and with adjusted signal through the second antenna opening input radio frequency receiver module, to feed back to comparison module; Another road signal outputs to spectrum analysis module; Like spectrum analyzer; In the process that pre-distortion coefficients is regulated; The adjacent channel power of linearity index such as this road signal that can come this road signal of observation analysis through spectrum analyzer is than the value of ACPR, obtains the linearity index of feedback signal through the linearity index of analyzing this road signal, to the calibration pre-distortion coefficients of the value that finds the ACPR that makes feedback signal in preset range; Thereby can determine the distortion size that feedback signal compares with the input signal of pre-distortion module, and then determine the distortion size that the output signal of power amplifier is compared with the input signal of pre-distortion module.Exemplarily, this spectrum analyzer can be PSA.Exemplarily, above-mentioned attenuation module is adjustable attenuator, is used to the signal that Receiver Module provides suitable power bracket.Exemplarily; The operator that can be calibration is through observing the analysis result of spectrum analysis module; Come the manual setting pre-distortion coefficients; Also can be that spectrum analysis module is imported the pre-distortion module with analysis result automatically, adjust pre-distortion coefficients automatically according to the analysis result of input by the pre-distortion module.
Like Fig. 3, the signal of input radio frequency transmitter module after the digital-to-analogue conversion of D/A converter module such as D/A converter, carries out up-conversion by modulation module, amplifies output through power amplifier again, exports through first antenna opening.The radiofrequency signal of power amplifier output is behind merit sub-module, power conditioning module; Receiver Module receives this signal through second antenna opening; And with the signal that receives after the analog-to-digital conversion of down-conversion, analog-to-digital conversion module such as the A/D converter of demodulation module; Obtain the digitized feedback signal of the radiofrequency signal of radiofrequency emitting module output, and with this feedback signal input comparison module; The input signal of comparison module comparison pre-distortion module and the feedback signal that receives; When judging power amplifier and being operated in nonlinear area; Pre-distortion module adjustment pre-distortion coefficients; Make feedback signal with respect to the distortion size of the input signal of pre-distortion module in preset distortion range; Calibration pre-distortion coefficients during different output power point in the time of can obtaining power amplifier like this and be operated in nonlinear area, the power output and the calibration pre-distortion coefficients corresponding of preserving said power amplifier, the LUT that calibrates with generation with this power output.Utilize the LUT of this calibration, MIMO can carry out pre-distortion to input signal in the course of the work the time more accurately, to improve the linearity of radio frequency sender.
In concrete the realization, in radiofrequency emitting module, also have the front end device that is connected with the output of power amplifier, like switch, whether the signal of exporting with the control power amplifier passes through the antenna emission; In Receiver Module, also have the front end device that is connected with the input of demodulation module,, whether receive and transmit with the control Receiver Module like switch.
Preferably, after the LUT at MIMO terminal calibration was accomplished, except that second antenna opening and Receiver Module that the MIMO terminal comprises, other module all can uninstall in the calibrating installation.
Preferably, after the LUT at MIMO terminal calibration was accomplished, in the course of work at MIMO terminal, the feedback point of feedback module breaks off did not work.
Fig. 4 is the schematic flow sheet of calibration steps at the MIMO terminal of the embodiment of the invention, is used for that the LUT to the MIMO terminal calibrates before the MIMO terminal works.Below in conjunction with Fig. 3, Fig. 4 the step of the calibration steps of the embodiment of the invention is described.The calibration steps of this embodiment comprises:
Step 401; The radiofrequency signal of said radiofrequency emitting module output is fed back to second antenna opening through said first antenna opening; And the said signal that feeds back to second antenna opening is carried out down-conversion and analog-to-digital conversion through said Receiver Module, obtain the digitized feedback signal of said radiofrequency emitting module output signal;
In this step; Utilize the characteristics of the many antennas of mimo system; (POWERAMPLIFIER, output signal PA) launch and pass through another antenna opening acquisition feedback signal of MIMO through the antenna opening of MIMO, and pass through the corresponding Receiver Module of this another antenna opening power amplifier easily; Receive receiver like radio frequency, and carry out down-frequency conversion and analog-to-digital conversion module is that the A/D converter sampling obtains digitized feedback signal through modulation module.
Step 402; The input signal of more above-mentioned feedback signal and pre-distortion module; If said power amplifier is operated in nonlinear area; Then adjust pre-distortion coefficients,, preserve power amplifier current output power and the calibration pre-distortion coefficients corresponding with this power output until obtaining making the calibration pre-distortion coefficients of distortion size in preset distortion range of feedback signal with respect to the input signal of pre-distortion module.
In the process of adjustment; The pre-distortion module utilizes current pre-distortion coefficients that input signal is carried out pre-distortion; Judge through spectrum analysis module such as spectrum analyzer whether the value of the ACPR of feedback signal confirms whether the distortion size of feedback signal is positioned at preset scope in preset scope; Do not satisfy pre-conditioned promptly not in preset range the time in the distortion size of feedback signal; Continue the adjustment pre-distortion coefficients, make distortion size the pre-distortion coefficients preset distortion range in of said feedback signal until finding, the pre-distortion coefficients of this pre-distortion coefficients that finds as calibration with respect to the input signal of pre-distortion module.
In this step, compare with the input signal of pre-distortion module through feedback signal, can judge power amplifier and whether be operated in the range of linearity, like the gain linearity zone.Particularly, can utilize prior comparators to carry out above-mentioned comparison.Exemplarily, the difference of input signal that can be set in feedback signal and base band predistortion device confirms that power amplifier is operated in the range of linearity during less than predetermined threshold value; Otherwise, confirm that power amplifier is operated in nonlinear area.
The pre-distortion module is mainly carried out pre-distortion in the amplifier nonlinearity zone.In this step; If power amplifier is operated in the range of linearity; Input signal is not done any pre-distortion; And the value of power control word APC of storage in advance in the adjustment terminal, adjust the power output of power amplifier through the value of adjustment APC, calibrate with the pre-distortion coefficients of other power output point in the output power range of power amplifier the time; If be operated in nonlinear area, read the APC value, obtain the current transmitting power of radiofrequency emitting module according to the APC value; And and then obtain the power amplifier current output power; Regulate pre-distortion coefficients, in the scope that the output signal and the distortion size of pre-distortion module input signal of power amplifier are being preset, exemplarily; Regulate pre-distortion coefficients in the scope that the value of the linearity index ACPR of feedback signal is being preset; Pre-distortion coefficients after this adjusting is the calibration pre-distortion coefficients under the power amplifier present output power, reads this calibration factor, and preserves power amplifier current output power and the corresponding calibration pre-distortion coefficients of this power; Exemplarily, can be through preserving the power output that the APC value is indicated above-mentioned PA.In this example; Through regulating pre-distortion coefficients; Regulate the pre-distortion that the pre-distortion module is carried out input signal, until finding suitable pre-distortion coefficients to make the output signal of power amplifier compare with the input signal of pre-distortion module, distortion is in preset scope.Exemplarily, can select to make the pre-distortion coefficients of the minimum pre-distortion coefficients of the value of ACPR as calibration.
Step 403; The output power range of adjustment power amplifier; In the non-linear power output zone of said power amplifier, under the different output power point, carry out above-mentioned steps 402; When obtaining in the non-linear power output zone of power amplifier, calibration pre-distortion coefficients that different output power point is corresponding, and the preparatory mistake pre-distortion coefficients look-up table that utilizes different power outputs and corresponding calibration pre-distortion coefficients generation to calibrate.
In this step, the output power range of above-mentioned adjustment power amplifier mainly is the power output of adjustment PA in the nonlinear area of power amplifier.
In this step; The output power range of above-mentioned adjustment power amplifier specifically can be realized through the value in the nonlinear gain zone of power amplifier branch step-length adjustment APC control word; Whenever adjust to a control word; Just adjust pre-distortion coefficients, and under present output power, export the size of the distortion of signal, find the pre-distortion coefficients of linearity index ACPR value in preset range that makes power amplifier output signal through comparator judgement power amplifier; Write down this coefficient; At this moment power output can obtain through reading the APC control word, so just found the pre-distortion coefficients corresponding with this power output, generates the pre-distortion coefficients look-up table of calibrating to this power output and corresponding pre-distortion coefficients storage.What preferably, preserve in the pre-distortion coefficients look-up table of calibration is value and the corresponding relation between the pre-distortion coefficients of the APC at MIMO terminal.
After generating the pre-distortion coefficients look-up table of above-mentioned calibration, the MIMO terminal in the course of the work, the LUT of the above-mentioned calibration through searching storage carries out preliminary treatment to the input signal of pre-distortion module, can improve the linearity of radio frequency sender.
Preferably; Behind the pre-distortion coefficients look-up table that generates calibration; In the course of work of MIMO; When power amplifier was operated in nonlinear area, the pre-distortion module was obtained and the corresponding pre-distortion coefficients of said power amplifier current output power from the pre-distortion coefficients look-up table of calibration according to the power output of power amplifier; And the input signal of said pre-distortion module is carried out pre-distortion, and the signal after the said pre-distortion is imported said radiofrequency emitting module launch according to the said pre-distortion coefficients of obtaining.
Fig. 5 is after utilizing the calibration steps of the embodiment of the invention to generate the LUT of calibration, the schematic flow sheet of MIMO terminal RF transmission method in the course of the work.Fig. 6 carries out the operation principle sketch map of radio-frequency transmissions for the MIMO terminal utilizes LUT after the calibration through first antenna that is arranged on first antenna opening.Like Fig. 6, the pre-distortion coefficients look-up table LUT that the pre-distortion module is used is the calibration LUT through calibration.In conjunction with Fig. 5, Fig. 6, this RF transmission method comprises:
Step 501, pre-distortion module judge according to the power output of power amplifier whether power amplifier is operated in nonlinear area; In this way, execution in step 502 then; Otherwise, input signal is not carried out any processing;
In this step; When preserve among the LUT be power output and the corresponding relation between the pre-distortion coefficients of PA the time; The MIMO terminal obtains the transmitting power of radiofrequency emitting module through the value that reads APC, and and then obtain the value of the power output of power amplifier PA, can judge power amplifier according to the power output of this PA and whether be operated in nonlinear area; If be operated in the range of linearity, input signal is not done any processing; If be operated in nonlinear area, read the APC value, and execution in step 502.
In this step, when preserve among the LUT for the corresponding relation between the value of APC and the pre-distortion coefficients time, can be directly judge according to the value of the APC that reads whether PA is operated in the range of linearity.
Particularly, can be in advance in MIMO storage PA by the linear work zone to nonlinear operation the threshold value of power output when regional, when the power output of PA during greater than this threshold value, PA is operated in nonlinear area; In like manner, also can deposit in advance PA by linear work zone to nonlinear operation the threshold value of APC value when regional; When PA current output power during greater than this threshold value, PA is operated in nonlinear area.
Among this embodiment; Since store among the LUT be generally PA and be operated in nonlinear area the time power output or the corresponding relation between APC value and the pre-distortion coefficients; So can directly whether be present in usually and judge among the LUT whether PA is operated in nonlinear area through the value of judging current output power or APC; So just can directly in the pre-distortion coefficients look-up table, reach pre-distortion coefficients, come input signal is carried out predistortion according to the power output that obtains or according to the APC value that is read.
Step 502; The pre-distortion module is according to the power output of power amplifier; From the pre-distortion coefficients look-up table of calibration, obtain and the corresponding pre-distortion coefficients of power amplifier current output power; And the baseband signal of input pre-distortion module is carried out pre-distortion, and with the baseband signal input radio frequency transmitter module after the pre-distortion, through launching through first antenna after digital-to-analogue conversion, modulation and the amplification according to the pre-distortion coefficients of obtaining.
Utilize the launching technique of this embodiment to carry out radio-frequency transmissions, can improve MIMO terminal power linearity of amplifier degree.
In concrete the application, can, the MIMO terminal utilize the calibration steps of the embodiment of the invention to carry out the calibration of pre-distortion coefficients before dispatching from the factory, and the MIMO terminal after the calibration utilizes above-mentioned launching technique to carry out radio-frequency transmissions in the course of the work.
In this step, can search the pre-distortion calibration table of storage, carry out pre-distortion to transmitting, obtain a pre-distorted signals opposite with the non-linearity of power amplifier characteristic according to the APC value that reads.
In this step, the input signal of pre-distortion module such as baseband signal are actually two paths of signals I road signal and Q road signal, and the pre-distortion module is handled this two paths of signals when pluralizing.Vector gain adjuster in the pre-distortion module is handled the shape of regulating distortion curve according to the pre-distortion coefficients of correspondence to input signal; Exemplarily; Pre-emphasis method as pre-distortion coefficients and input signal are multiplied each other is regulated the shape of distortion curve, thus provide one with the opposite nonlinear characteristic of power amplifier output.
In the range of linearity of power amplifier,, still be linear behind the process power amplifier owing to signal is not carried out any processing; At nonlinear area, non-linear the cancelling out each other that the signal non-linear after pre-distortion just in time produces with power amplifier, thus enlarged the range of linearity of PA output, improved the linearity of radio frequency sending set.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (13)
1. the calibrating installation of a multi-input multi-output (MIMO) terminal, said multiple-input and multiple-output MIMO terminal comprises: first antenna opening, and the radiofrequency emitting module that is connected with said first antenna opening, said radiofrequency emitting module comprises power amplifier, it is characterized in that,
Said MIMO terminal also comprises:
The pre-distortion module; Be connected with the input of said radiofrequency emitting module; When being used for being in the course of work and said power amplifier and being operated in nonlinear area at said MIMO terminal; Before said input signal is imported said radiofrequency emitting module, from preset pre-distortion coefficients look-up table, obtain and the corresponding pre-distortion coefficients of said power amplifier current output power, and said input signal is carried out pre-distortion according to the said pre-distortion coefficients of obtaining; Said pre-distortion coefficients look-up table comprises: the power output of said power amplifier and the corresponding relation between the pre-distortion coefficients;
Said calibrating installation is used for before said MIMO terminal works, obtaining the pre-distortion coefficients look-up table of calibration, comprising:
Second antenna opening;
Feedback module is used for the radiofrequency signal of said radiofrequency emitting module output is fed back to said second antenna opening through said first antenna opening;
Receiver Module is used for the said signal that feeds back to said second antenna opening is carried out down-conversion and analog-to-digital conversion, obtains the digitized feedback signal of the radiofrequency signal of said radiofrequency emitting module output;
Comparison module is used for the feedback signal of more said Receiver Module output and the input signal of said pre-distortion module, and confirms according to result relatively whether said power amplifier is operated in nonlinear area;
Distortion size determination module is used for when said power amplifier is operated in nonlinear area, confirms the distortion size of said feedback signal with respect to the input signal of said pre-distortion module;
Said pre-distortion module; Be further used for when said power amplifier is operated in nonlinear area; According to the distortion size that said distortion size determination module is confirmed, adjust said pre-distortion coefficients, until obtaining making the calibration pre-distortion coefficients of said distortion size in preset distortion range.
2. calibrating installation according to claim 1 is characterized in that, the power output of the said power amplifier in the said pre-distortion coefficients look-up table and the corresponding relation between the said pre-distortion coefficients are:
The value of the power control word APC at said MIMO terminal and the corresponding relation between the said pre-distortion coefficients.
3. calibrating installation according to claim 1 is characterized in that, said pre-distortion coefficients comprises: the phase adjusted coefficient of said power amplifier and at least one in the accommodation coefficient of gain.
4. calibrating installation according to claim 1 is characterized in that, said second antenna opening is in a plurality of antenna opening of comprising of said MIMO terminal, other antenna opening except that said first antenna opening; Said Receiver Module is and the corresponding Receiver Module of said second antenna opening.
5. according to each described calibrating installation among the claim 1-4, it is characterized in that,
Said feedback module comprises:
The merit sub-module is connected with said first antenna opening, is used for the radiofrequency signal of said radiofrequency emitting module output is divided into two same signals;
Power conditioning module is used for receiving a road of said two-way same signal, one road signal of said reception is carried out power adjustments, and the signal after the said adjusting is imported said Receiver Module;
Said distortion size determination module is imported on another road in the said two paths of signals.
6. calibrating installation according to claim 5 is characterized in that, said distortion size determination module passes through to analyze the value of the adjacent channel power of said feedback signal than ACPR, confirms the distortion size of said feedback signal.
7. the calibration steps of a multi-input multi-output (MIMO) terminal, said multiple-input and multiple-output MIMO terminal comprises: first antenna opening, and the radiofrequency emitting module that is connected with said first antenna opening, said radiofrequency emitting module comprises power amplifier, it is characterized in that,
Said MIMO terminal also comprises:
Second antenna opening;
The Receiver Module that is connected with said second antenna opening;
The pre-distortion module; Be connected with the input of said radiofrequency emitting module; When being used for being in the course of work and said power amplifier and being operated in nonlinear area at said MIMO terminal; Before said input signal is imported said radiofrequency emitting module, from preset pre-distortion coefficients look-up table, obtain and the corresponding pre-distortion coefficients of said power amplifier current output power, and said input signal is carried out pre-distortion according to the said pre-distortion coefficients of obtaining; Said pre-distortion coefficients look-up table comprises: the power output of said power amplifier and the corresponding relation between the pre-distortion coefficients;
Said calibration steps is used for before said MIMO terminal works, said pre-distortion coefficients look-up table being calibrated, and said calibration steps comprises the steps:
Steps A; The radiofrequency signal of said radiofrequency emitting module output is fed back to said second antenna opening through said first antenna opening; And the said signal that feeds back to said second antenna opening is carried out down-conversion and analog-to-digital conversion through said Receiver Module, obtain the digitized feedback signal that transmits of said radiofrequency emitting module;
Step B; The input signal of more said feedback signal and said pre-distortion module; If said power amplifier is operated in nonlinear area; Then adjust said pre-distortion coefficients,, preserve the power output and the calibration pre-distortion coefficients corresponding of said power amplifier with said power output until obtaining making the calibration pre-distortion coefficients of distortion size in preset range of said feedback signal with respect to the input signal of said pre-distortion module.
8. calibration steps according to claim 7 is characterized in that, the power output of the said power amplifier in the said pre-distortion coefficients look-up table and the corresponding relation between the said pre-distortion coefficients are:
The value of the power control word APC at said MIMO terminal and the corresponding relation between the said pre-distortion coefficients;
Among the said step B, the power output of the said power amplifier of said preservation and the calibration pre-distortion coefficients corresponding with said power output are:
Preserve the value of the power control word APC corresponding and corresponding calibration pre-distortion coefficients with the power output of said power amplifier.
9. calibration steps according to claim 7; It is characterized in that; Among the said step B; Adjacent channel power through judging said feedback signal than the value of ACPR whether in preset scope, confirm said feedback signal with respect to the distortion size of the input signal of said pre-distortion module whether in the scope of presetting.
10. calibration steps according to claim 7 is characterized in that, also comprises before the said steps A: the step that the radiofrequency signal of said radiofrequency emitting module output is divided into identical two-way;
Said second antenna opening of leading up in the said two-way feeds back to said Receiver Module, and another road in the said two-way is used for confirming the distortion size of said feedback signal.
11., it is characterized in that said step B also comprises according to each described calibration steps among the claim 7-10:
Adjust the output power range of said power amplifier; With in the non-linear power output zone that obtains said power amplifier, calibration pre-distortion coefficients that different output power point is corresponding, and utilize the corresponding calibration pre-distortion coefficients of said different output power point to generate the pre-distortion coefficients look-up table of calibrating.
12. calibration steps according to claim 11 is characterized in that, the value of the power control word APC through adjusting said MIMO terminal is adjusted the output power range of said power amplifier.
13. calibration steps according to claim 11 is characterized in that, behind the pre-distortion coefficients look-up table that generates said calibration, in the course of work at said MIMO terminal, also comprises:
Step a obtains the power output of said power amplifier;
Step b; When said power amplifier is operated in nonlinear area; Said pre-distortion module is according to the power output of said power amplifier; From the pre-distortion coefficients look-up table of said calibration, obtain and the corresponding pre-distortion coefficients of said power amplifier current output power, and the input signal of said pre-distortion module is carried out pre-distortion, and the signal after the said pre-distortion is imported said radiofrequency emitting module launch according to the said pre-distortion coefficients of obtaining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910090874XA CN101626355B (en) | 2009-08-11 | 2009-08-11 | Calibration device and calibration method of multi-input multi-output (MIMO) terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910090874XA CN101626355B (en) | 2009-08-11 | 2009-08-11 | Calibration device and calibration method of multi-input multi-output (MIMO) terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101626355A CN101626355A (en) | 2010-01-13 |
| CN101626355B true CN101626355B (en) | 2012-11-14 |
Family
ID=41522046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910090874XA Expired - Fee Related CN101626355B (en) | 2009-08-11 | 2009-08-11 | Calibration device and calibration method of multi-input multi-output (MIMO) terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101626355B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300919A (en) * | 2013-07-19 | 2015-01-21 | 瑞昱半导体股份有限公司 | Predistortion method and device |
| US9355195B2 (en) | 2013-03-29 | 2016-05-31 | International Business Machines Corporation | Automatic calibration of a model for a complex flow system |
Families Citing this family (54)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011133542A1 (en) | 2010-04-19 | 2011-10-27 | Rf Micro Devices, Inc. | Pseudo-envelope following power management system |
| US9099961B2 (en) | 2010-04-19 | 2015-08-04 | Rf Micro Devices, Inc. | Output impedance compensation of a pseudo-envelope follower power management system |
| US9431974B2 (en) | 2010-04-19 | 2016-08-30 | Qorvo Us, Inc. | Pseudo-envelope following feedback delay compensation |
| US9954436B2 (en) | 2010-09-29 | 2018-04-24 | Qorvo Us, Inc. | Single μC-buckboost converter with multiple regulated supply outputs |
| AU2010364993B2 (en) * | 2010-12-01 | 2015-06-11 | Telefonaktiebolaget L M Ericsson (Publ) | Method, antenna array, computer program and computer program product for obtaining at least one calibration parameter |
| CN102026349B (en) * | 2010-12-09 | 2014-08-13 | 中兴通讯股份有限公司 | Control method and device for transmitting power |
| US9379667B2 (en) | 2011-05-05 | 2016-06-28 | Rf Micro Devices, Inc. | Multiple power supply input parallel amplifier based envelope tracking |
| US9246460B2 (en) | 2011-05-05 | 2016-01-26 | Rf Micro Devices, Inc. | Power management architecture for modulated and constant supply operation |
| US9247496B2 (en) | 2011-05-05 | 2016-01-26 | Rf Micro Devices, Inc. | Power loop control based envelope tracking |
| EP2715945B1 (en) | 2011-05-31 | 2017-02-01 | Qorvo US, Inc. | Rugged iq receiver based rf gain measurements |
| US9263996B2 (en) | 2011-07-20 | 2016-02-16 | Rf Micro Devices, Inc. | Quasi iso-gain supply voltage function for envelope tracking systems |
| US9484797B2 (en) | 2011-10-26 | 2016-11-01 | Qorvo Us, Inc. | RF switching converter with ripple correction |
| CN102510765B (en) * | 2011-11-28 | 2014-09-03 | 华为技术有限公司 | Method for adjusting predistortion factors and device thereof |
| US8975959B2 (en) * | 2011-11-30 | 2015-03-10 | Rf Micro Devices, Inc. | Monotonic conversion of RF power amplifier calibration data |
| US9250643B2 (en) | 2011-11-30 | 2016-02-02 | Rf Micro Devices, Inc. | Using a switching signal delay to reduce noise from a switching power supply |
| US9515621B2 (en) | 2011-11-30 | 2016-12-06 | Qorvo Us, Inc. | Multimode RF amplifier system |
| US9280163B2 (en) | 2011-12-01 | 2016-03-08 | Rf Micro Devices, Inc. | Average power tracking controller |
| US9041365B2 (en) | 2011-12-01 | 2015-05-26 | Rf Micro Devices, Inc. | Multiple mode RF power converter |
| US9494962B2 (en) | 2011-12-02 | 2016-11-15 | Rf Micro Devices, Inc. | Phase reconfigurable switching power supply |
| US9813036B2 (en) | 2011-12-16 | 2017-11-07 | Qorvo Us, Inc. | Dynamic loadline power amplifier with baseband linearization |
| US9298198B2 (en) | 2011-12-28 | 2016-03-29 | Rf Micro Devices, Inc. | Noise reduction for envelope tracking |
| CN102811080B (en) * | 2012-08-20 | 2015-04-22 | 北京傲天动联技术股份有限公司 | Multi-input multi-output base station and method for sending and receiving signal by using base station |
| US9225231B2 (en) | 2012-09-14 | 2015-12-29 | Rf Micro Devices, Inc. | Open loop ripple cancellation circuit in a DC-DC converter |
| US9197256B2 (en) | 2012-10-08 | 2015-11-24 | Rf Micro Devices, Inc. | Reducing effects of RF mixer-based artifact using pre-distortion of an envelope power supply signal |
| WO2014062902A1 (en) | 2012-10-18 | 2014-04-24 | Rf Micro Devices, Inc | Transitioning from envelope tracking to average power tracking |
| US9627975B2 (en) | 2012-11-16 | 2017-04-18 | Qorvo Us, Inc. | Modulated power supply system and method with automatic transition between buck and boost modes |
| US9014299B2 (en) * | 2012-12-07 | 2015-04-21 | Maxim Integrated Products, Inc. | Digital pre-distortion system for radio frequency transmitters with reduced sampling rate in observation loop |
| US9300252B2 (en) | 2013-01-24 | 2016-03-29 | Rf Micro Devices, Inc. | Communications based adjustments of a parallel amplifier power supply |
| WO2014152876A1 (en) | 2013-03-14 | 2014-09-25 | Rf Micro Devices, Inc | Noise conversion gain limited rf power amplifier |
| WO2014152903A2 (en) | 2013-03-14 | 2014-09-25 | Rf Micro Devices, Inc | Envelope tracking power supply voltage dynamic range reduction |
| US9479118B2 (en) | 2013-04-16 | 2016-10-25 | Rf Micro Devices, Inc. | Dual instantaneous envelope tracking |
| US9374005B2 (en) | 2013-08-13 | 2016-06-21 | Rf Micro Devices, Inc. | Expanded range DC-DC converter |
| CN104955145A (en) * | 2014-03-25 | 2015-09-30 | 富士通株式会社 | Control device, transmitter and method |
| US9614476B2 (en) | 2014-07-01 | 2017-04-04 | Qorvo Us, Inc. | Group delay calibration of RF envelope tracking |
| CN104301047B (en) * | 2014-10-22 | 2017-06-16 | 中国电子科技集团公司第四十一研究所 | A kind of power self-calibration device and method of multimode multi-frequency multi-channel system |
| CN105764075B (en) * | 2014-12-15 | 2019-04-26 | 联想(北京)有限公司 | Obtain the method and terminal device of digital pre-distortion calibration value |
| CN105812031A (en) * | 2014-12-31 | 2016-07-27 | 联想(北京)有限公司 | Electronic equipment and control method therefor |
| CN106797357B (en) * | 2015-06-05 | 2019-10-01 | 华为技术有限公司 | The treating method and apparatus of high-speed serial signals |
| US9948240B2 (en) | 2015-07-01 | 2018-04-17 | Qorvo Us, Inc. | Dual-output asynchronous power converter circuitry |
| US9912297B2 (en) | 2015-07-01 | 2018-03-06 | Qorvo Us, Inc. | Envelope tracking power converter circuitry |
| CN105763503B (en) * | 2016-04-25 | 2019-11-19 | 京信通信系统（中国）有限公司 | A kind of digital pre-distortion processing method and device |
| US9973147B2 (en) | 2016-05-10 | 2018-05-15 | Qorvo Us, Inc. | Envelope tracking power management circuit |
| CN108604884A (en) * | 2016-11-15 | 2018-09-28 | 思科技术公司 | Amplified by the high power efficiency at digital pre-distortion and the cable modem of machine learning in cable network environment |
| WO2019157703A1 (en) * | 2018-02-14 | 2019-08-22 | Oppo广东移动通信有限公司 | Output power adjustment method and related product |
| CN111373656B (en) * | 2018-02-14 | 2021-10-29 | Oppo广东移动通信有限公司 | Output power adjusting method and related product |
| US10476437B2 (en) | 2018-03-15 | 2019-11-12 | Qorvo Us, Inc. | Multimode voltage tracker circuit |
| CN110620592B (en) * | 2018-06-20 | 2022-07-01 | 三星电子株式会社 | Communication device, communication system and method for compensating for non-linearity of transmitter |
| CN109302156B (en) * | 2018-09-28 | 2022-03-29 | 东南大学 | Power amplifier dynamic linearization system based on pattern recognition and method thereof |
| CN110190885A (en) * | 2019-05-28 | 2019-08-30 | 清华大学 | Based on airspace feedback towards the digital pre-distortion structure for mixing extensive MIMO array |
| CN110912624B (en) * | 2019-11-01 | 2021-08-31 | 维沃移动通信有限公司 | Digital pre-distortion processing method and electronic equipment |
| CN113395047A (en) * | 2020-03-13 | 2021-09-14 | 瑞昱半导体股份有限公司 | Calibration system, radio frequency system and output power linearization method thereof |
| CN115037318B (en) * | 2021-03-08 | 2024-03-01 | 维沃移动通信有限公司 | Nonlinear calibration method and device for PA |
| CN113382462B (en) * | 2021-05-20 | 2023-03-21 | 深圳市星楷通讯设备有限公司 | Multi-closed-loop power control system and control method suitable for satellite communication |
| CN114553247B (en) * | 2022-04-08 | 2023-07-28 | 上海星思半导体有限责任公司 | Radio frequency circuit, method and device for determining digital predistortion coefficient set |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751444A (en) * | 2002-09-10 | 2006-03-22 | 美商寇格尼欧股份有限公司 | Techniques for correcting for phase and amplitude offsets in a MIMO radio device |
| CN1943194A (en) * | 2004-02-19 | 2007-04-04 | 高通股份有限公司 | Calibration of downlink and uplink channel responses in a wireless MIMO communication system |
| CN200973090Y (en) * | 2005-04-07 | 2007-11-07 | 美商内数位科技公司 | Optimization antenna mapping multi-input multi-output radio transmit/receive unit |
| US7463622B2 (en) * | 2004-11-10 | 2008-12-09 | Wei Lu | Integrated communication terminal for next generation mobile telecommunications |
-
2009
- 2009-08-11 CN CN200910090874XA patent/CN101626355B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751444A (en) * | 2002-09-10 | 2006-03-22 | 美商寇格尼欧股份有限公司 | Techniques for correcting for phase and amplitude offsets in a MIMO radio device |
| CN1943194A (en) * | 2004-02-19 | 2007-04-04 | 高通股份有限公司 | Calibration of downlink and uplink channel responses in a wireless MIMO communication system |
| US7463622B2 (en) * | 2004-11-10 | 2008-12-09 | Wei Lu | Integrated communication terminal for next generation mobile telecommunications |
| CN200973090Y (en) * | 2005-04-07 | 2007-11-07 | 美商内数位科技公司 | Optimization antenna mapping multi-input multi-output radio transmit/receive unit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9355195B2 (en) | 2013-03-29 | 2016-05-31 | International Business Machines Corporation | Automatic calibration of a model for a complex flow system |
| CN104300919A (en) * | 2013-07-19 | 2015-01-21 | 瑞昱半导体股份有限公司 | Predistortion method and device |
| CN104300919B (en) * | 2013-07-19 | 2017-06-16 | 瑞昱半导体股份有限公司 | Pre-distortion method and pre-distortion device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101626355A (en) | 2010-01-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101626355B (en) | Calibration device and calibration method of multi-input multi-output (MIMO) terminal | |
| CN101626356B (en) | Multi-input multi-output (MIMO) terminal and radio-frequency emission method thereof | |
| US11496101B2 (en) | RF transceiver front end module with improved linearity | |
| CN107078698B (en) | Doherty power amplifier with tunable input network | |
| KR102508414B1 (en) | Rf transceiver front end module with improved linearity | |
| US20160285485A1 (en) | Method and apparatus for multiband predistortion using time-shared adaptation loop | |
| CN101569142B (en) | Predistortion correction loop-back based on high linearity and low linearity modes | |
| KR100326176B1 (en) | Apparatus and method for linearizing power amplification using predistortion and feedfoward method in rf communicaiton | |
| US7456688B2 (en) | Signal extraction circuit and distortion-compensated amplifier incorporating the same | |
| US20120195392A1 (en) | Predistortion in split-mount wireless communication systems | |
| US6531917B2 (en) | Non-linear distortion compensating apparatus | |
| CN1550064A (en) | Calibration of an adaptive signal conditioning system | |
| CN102231620A (en) | Power amplifier linearization method and device based on baseband digital predistortion technology | |
| CN102037699A (en) | Distortion compensation circuit and distortion compensation method | |
| CN101114811A (en) | Analog predistortion based linear power amplification circuit and method | |
| CN202551096U (en) | Signal emitter | |
| CN108347226A (en) | Envelope-tracking method, system and device | |
| CN112019221B (en) | Signal processing method, device and storage medium | |
| CN104980384A (en) | Signal processing method, system and device for DPD (Digital Pre-Distortion) MCPA (Multi-Carrier Power Amplifier) and MCPA | |
| CN101056128B (en) | Method and transmitter of the stable transmission power | |
| CN102724153B (en) | DPD (digital pre-distortion) based far end machine and repeater system | |
| US20140010330A1 (en) | Transmission device and transmission method | |
| US10958298B2 (en) | Digital pre-distortion technique for a circuit arrangement with a power amplifier | |
| CN108900207B (en) | Power amplifier device, radio frequency signal processing system and base station | |
| CN106712728A (en) | Method for compensating power amplifier predistortion in satellite communication |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20200811 |