CN105764075A - Method for obtaining digital pre-distortion calibration value and terminal equipment - Google Patents
Method for obtaining digital pre-distortion calibration value and terminal equipment Download PDFInfo
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- CN105764075A CN105764075A CN201410776126.8A CN201410776126A CN105764075A CN 105764075 A CN105764075 A CN 105764075A CN 201410776126 A CN201410776126 A CN 201410776126A CN 105764075 A CN105764075 A CN 105764075A
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Abstract
According to the embodiment of the invention, a method for obtaining the calibration value of digital pre-distortion (DPD) and terminal equipment are provided. The method comprises a step of inputting the input signal of a first calibration frequency band in multiple calibration frequency bands to the terminal equipment, a step of setting a signal transmitting power amplifier to output a related parameter such that the output signal generated by signal transmitting power amplifier responding to the input signal enters into a non-linear area, a step of receiving the first power value measured by the measuring equipment connected to the terminal equipment, a step of measuring the feedback signal which is obtained according to the output signal through a feedback RF receiving unit so as to obtain a second power value, and a step of calculating the difference between the first power value and the second value as the calibration value of the DPD calibration under the first calibration frequency band.
Description
Technical field
The present invention relates to a kind of method obtaining the calibration value that digital pre-distortion (DPD) is calibrated and terminal unit, it is more particularly related to a kind of method and terminal unit being obtained the calibration value that digital pre-distortion (DPD) is calibrated by self calibration mode.
Background technology
Further development along with mobile communication technology, the mobile communication products such as mobile phone are universal rapidly and extensively use, people are interknited more convenient, meet people and carry out the demand of call contact whenever and wherever possible, thus it is guaranteed that the speech quality of the mobile communication products such as mobile phone is particularly important.
The mobile communication products such as mobile phone dispatch from the factory and are required for before carrying out digital pre-distortion (DPD) calibration, and no matter the mobile communication products such as existing mobile phone are be applied in enhanced data rates for gsm evolution technology (EDGE), or follow the trail of on (EPT) in enhanced power, this calibration process speed is all very slow, and occupy substantial amounts of equipment, especially the occupying of comprehensive test instrument so that the efficiency of dispatching from the factory of qualified mobile phone cannot be effectively improved.
Summary of the invention
In view of the above problems, according to an aspect of the present invention, provide a kind of method obtaining the calibration value that digital pre-distortion (DPD) is calibrated by self calibration, it is applied to terminal unit, wherein terminal unit includes launching signal power amplifier, transmitting antenna, feedback radio frequency reception (FBRX) unit, described method includes to terminal unit input input signal, and the frequency wherein inputting signal is arranged in the first calibration frequency range of multiple calibration frequency ranges of terminal unit；Arrange and launch the parameter that signal power amplifier output is relevant, so that the output signal that transmitting signal power amplifier generates in response to input signal enters inelastic region；Receive the first performance number measured by the measurement device being connected to terminal unit, the power launching signal that wherein output signal is launched by the first performance number instruction by transmitting antenna；The feedback signal that obtains according to output signal is measured, to obtain the power of feedback signal as the second performance number by FBRX unit；Calculate the difference of the first performance number and the second performance number, as the first DPD calibrated under frequency range calibration value calibrated.
According to another aspect of the present invention, additionally provide one and can be obtained the terminal unit of the calibration value that digital pre-distortion (DPD) is calibrated by self calibration mode, including input block, configuration receives the input signal to terminal unit input, and the frequency wherein inputting signal is arranged in arbitrary calibration frequency range of multiple calibration frequency ranges of terminal unit；Parameter set unit, configuration is arranged launches the parameter that signal power amplifier output is relevant, so that the output signal that transmitting signal power amplifier generates in response to input signal enters inelastic region；Receiving unit, configuration receives the first performance number measured by the measurement device being connected to terminal unit, the power launching signal that wherein output signal is launched by the first performance number instruction by transmitting antenna；FBRX unit, the feedback signal obtained according to described output signal is measured in configuration, to obtain the power of feedback signal as the second performance number；Computing unit, configuration calculates the difference of the first performance number and the second performance number, and wherein difference is in order to the calibration value as the DPD calibration under calibration frequency range belonging to input signal.
By the method and the terminal unit that are obtained the DPD calibration value calibrated by self calibration mode that the embodiment of the present invention provides, the FBRX function introduced in the new platform of high pass can be made full use of, the DPD calibration carried out is needed to be realized by self-alignment mode when being dispatched from the factory by the mobile communication products such as mobile phone, the process speed of DPD calibration is accelerated with this, reduce taking equipment such as comprehensive test instruments, improve calibration efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in the description to embodiment is briefly described.Accompanying drawing in the following describes is only the exemplary embodiment of the present invention.
Fig. 1 depicts the flow chart that self calibration according to embodiments of the present invention obtains the method for the DPD calibration value calibrated.
Fig. 2 is the exemplary block diagram illustrating the terminal unit according to an embodiment of the invention with DPD self-calibration function.
Detailed description of the invention
Hereinafter, by preferred embodiments of the present invention will be described in detail with reference to the annexed drawings.Note in the present description and drawings, there is substantially the same step and element is denoted by the same reference numerals, and the repetition of explanation of these steps and element will be omitted.
Below, the method that the duty switching of embodiments of the invention is described with reference to Fig. 1.Fig. 1 depicts the flow chart that self calibration according to embodiments of the present invention obtains the method 100 of the DPD calibration value calibrated.The method 100 of the calibration value that self calibration obtains DPD calibration can be applicable to terminal unit, especially mobile communication terminal device.In an embodiment according to the present invention, the concrete form of terminal unit may include but be not limited to mobile phone, wearable communication equipment etc..Terminal unit can include launching signal power amplifier, transmitting antenna and FBRX unit.
As it is shown in figure 1, in step S101, terminal unit obtains input signal.According to one embodiment of present invention, being typically different the band limits that the terminal unit of type or different model can process different, input signal is the signal that terminal unit can process under frequency.Such as, when the frequency range that terminal unit can process contains tri-band limits of GSM, CDMA, LTE, input signal should be the signal under frequency corresponding to the respective calibration channel of above three frequency range, input signal corresponding to each above-mentioned frequency range input at the input of terminal unit respectively, can obtain the DPD corresponding with above three frequency band GSM, CDMA, LTE calibration value calibrated respectively through processing, check and calculating.Therefore, the input signal number of the embodiment of the present invention is corresponding with the frequency range number that terminal unit can process.In DPD calibration process, it is necessary to all frequency ranges that terminal unit is comprised all carry out a self calibration to obtain the calibration value of DPD calibration corresponding to each frequency range.
Then, in step s 102, the parameter launching signal power amplifier is set, so that the output signal that described transmitting signal power amplifier generates in response to described input signal enters inelastic region.As it has been described above, according to one embodiment of present invention, the frequency input signal under each calibration channel differs.In the case, for power amplifier (PA), it is necessary to the input signal for different frequency arranges different parameters so that the signal amplifying output enters inelastic region.Specifically, the instruction of the rf gain in terminal communication device (RGI) and baseband gain (BBGain) are to control PA output to enter the key parameter of inelastic region.Generally can by terminal communication device is carried out in advance debugging and measuring and calculating obtain.The corresponding one group of rf gain instruction of each calibration channel and baseband gain fixed value, therefore can debug and calculate one group of rf gain instruction corresponding to each calibration channel and baseband gain fixed value in advance, and by these in advance fixed value be stored in advance in the depositor of terminal communication device.When terminal communication device is carried out DPD self calibration, one group of fixed value of correspondence directly can be called from depositor for the input signal that difference is calibrated under channel so that PA output enters inelastic region.
In step s 103, the first performance number measured by the measurement device being connected to described terminal unit, the power launching signal that described output signal is launched by wherein said first performance number instruction by described transmitting antenna are received.According to one embodiment of present invention, by using the comprehensive test instrument being connected with terminal unit to carry out the power of the signal that measuring terminals equipment emits, and this performance number is sent to terminal unit preservation to treat that subsequent calculations calibration difference uses as the first performance number.The signal that comprehensive test instrument is measured is to enter, by PA output, the transmitting signal that the output signal of inelastic region ASM (Antennaswitchmodule) antenna switch module in terminal unit controls to launch, wherein ASM is for controlling the switch that terminal unit antenna is launched, and it has no effect on the performance number of the output signal entering inelastic region from PA output.The all of signal processed through terminal unit is all controlled to emission by this module.
In step S104, measure the feedback signal that obtains according to output signal by FBRX unit, to obtain the power of feedback signal as the second performance number.According to one embodiment of present invention, FBRX unit is arranged in terminal unit, measure the performance number of the feedback signal launching signal acquisition that the antenna according to terminal unit is launched, and preserve to treat that subsequent calculations calibration difference uses as the second performance number using this performance number.Feedback signal is by arranging the bonder signal from transmitting signal extraction at the antenna emission port place of terminal unit.In a sub-example according to the present invention, this bonder is a three-dimensional bonder (coupler), including input, output, three terminals of coupling.Launch signal to input from input, exported from outfan by bonder.Bonder is extracted feedback signal from the transmitting signal of input and is exported by coupled end, and to be fed to the measurement of FBRX unit, coupled end only samples only small power as feedback signal from transmitting signal.Comprehensive test instrument can be connected to the outfan of bonder to measure the first performance number of antenna transmitting signal in step s 103, and the FBRX unit in step S104 can be connected to coupled end to measure the second performance number launching signal.
It follows that in step S105, calculate the difference of the first performance number and the second performance number, as the calibration value calibrated of the DPD under corresponding band.According to one embodiment of present invention, this difference is the difference about amplitude and phase place calculated with the second performance number according to the first performance number.The first performance number obtained by comprehensive test instrument measurement with measured and calculated second performance number by FBRX unit, between two performance numbers, the relation of amplitude is AMAM, relation between phase place is that AMPM, AMAM and AMPM are namely as the calibration value calibrated of the DPD under corresponding band.AMAM and AMPM is deposited in the depositor of terminal unit, as the calibration value of the DPD calibration under the calibration frequency range corresponding with input signal.It is corresponding with the frequency range number that terminal unit can process that AMAM and the AMPM of the embodiment of the present invention organizes number.In a sub-example according to the present invention, when there being input signal every time, the frequency range belonging to input signal is called AMAM and the AMPM of corresponding band and is carried out DPD calibration.
As above, self calibration according to embodiments of the present invention obtains the method for the calibration value of DPD calibration, the FBRX unit carried by terminal unit carries out self calibration, the FBRX function introduced in the new platform of high pass can be made full use of, the DPD calibration carried out is needed to be realized by self-alignment mode when being dispatched from the factory by the mobile communication products such as mobile phone, accelerate the process speed of DPD calibration with this, reduce taking equipment such as comprehensive test instruments, improve calibration efficiency.
Below, with reference to what Fig. 2 illustrated embodiments of the invention, there is the self-alignment terminal unit of DPD.Fig. 2 is the exemplary block diagram illustrating and having the self-alignment terminal unit 200 of DPD according to an embodiment of the invention.As shown in Figure 2, the terminal unit 200 of the present embodiment, it is possible to obtained the calibration value of DPD calibration by self calibration mode, including input block 210, parameter set unit 220, receives unit 230, FBRX unit 240 and computing unit 250.The unit of terminal unit 200 can perform each step/function of the method 100 of the kinematic parameter of the prediction destination object in above-mentioned Fig. 1 respectively.Therefore, only the critical piece with the self-alignment terminal unit 200 of DPD is described below, and eliminates above already in connection with Fig. 1 detail content described.
Input block 210 can receive the input signal to terminal unit input, and the frequency wherein inputting signal is arranged in arbitrary calibration frequency range of multiple calibration frequency ranges of terminal unit.According to one embodiment of present invention, being typically different the band limits that the terminal unit of type or different model can process different, input signal is the signal that terminal unit can process under frequency.Such as, when the frequency range that terminal unit can process contains tri-band limits of GSM, CDMA, LTE, input signal should be the signal under frequency corresponding to the respective calibration channel of above three frequency range, input signal corresponding to each above-mentioned frequency range input at the input of terminal unit respectively, can obtain the DPD corresponding with above three frequency band GSM, CDMA, LTE calibration value calibrated respectively through processing, check and calculating.Therefore, the input signal number of the embodiment of the present invention is corresponding with the frequency range number that terminal unit can process.In DPD calibration process, it is necessary to all frequency ranges that terminal unit is comprised all carry out a self calibration to obtain the calibration value of DPD calibration corresponding to each frequency range.
Parameter set unit 220 can arrange the parameter launching signal power amplifier, so that launching the output signal entrance inelastic region that signal power amplifier generates in response to input signal.According to embodiments of the invention, the input signal being required for different frequency arranges different parameters, the signal amplifying output is made to enter inelastic region, rf gain instruction and baseband gain in terminal communication device are to control PA output to enter the key parameter of inelastic region, would generally debug and calculate one group of rf gain instruction corresponding to each calibration channel and baseband gain fixed value in advance, and by these in advance fixed value be stored in advance in the depositor of terminal communication device, when terminal communication device is carried out DPD self calibration, one group of fixed value of correspondence directly can be called from depositor for the input signal that difference is calibrated under channel, PA output is made to enter inelastic region.
Receive unit 230 and can receive the first performance number measured by the measurement device being connected to terminal unit, the power launching signal that described output signal is launched by transmitting antenna by wherein said first performance number instruction.According to one embodiment of present invention, by using the comprehensive test instrument being connected with terminal unit to carry out the power of the signal that measuring terminals equipment emits, and preserved to treat that subsequent calculations calibration difference uses using the reception unit that this performance number is sent to terminal unit as the first performance number.
Feedback rf receiver unit 240 can measure the feedback signal that obtains according to output signal, to obtain the power of feedback signal as the second performance number.According to one embodiment of present invention, measured the performance number of the feedback signal launching signal acquisition that the antenna according to terminal unit is launched by terminal unit, and preserve to treat that subsequent calculations calibration difference uses as the second performance number using this performance number.Feedback signal is by arranging bonder at the antenna emission port place of terminal unit from launching the signal that signal back is come.In a sub-example according to the present invention, this bonder is a three-dimensional bonder, including input, output, three terminals of coupling.Launch signal to input from input, exported from outfan by bonder.Bonder is extracted feedback signal from the transmitting signal of input and is exported by coupled end, and to be fed to the measurement of FBRX unit, coupled end only samples only small power as feedback signal from transmitting signal.
Computing unit 250 can calculate the difference of the first performance number and the second performance number, and wherein difference is in order to the calibration value as the DPD calibration under calibration frequency range belonging to input signal.According to one embodiment of present invention, this difference is the difference about amplitude and phase place calculated with the second performance number according to the first performance number.The first performance number obtained by comprehensive test instrument measurement with measured and calculated second performance number by FBRX unit, between two performance numbers, the relation of amplitude is AMAM, relation between phase place is that AMPM, AMAM and AMPM are namely as the calibration value calibrated of the DPD under corresponding band.AMAM and AMPM is deposited in the depositor of terminal unit, as the calibration value of the DPD calibration under the calibration frequency range corresponding with input signal.It is corresponding with the frequency range number that terminal unit can process that AMAM and the AMPM of the embodiment of the present invention organizes number.In a sub-example according to the present invention, when there being input signal every time, the frequency range belonging to input signal is called AMAM and the AMPM of corresponding band and is carried out DPD calibration.
As above, according to embodiments of the present invention there is the self-alignment terminal unit of DPD, the FBRX unit carried by terminal unit carries out self calibration, the FBRX function introduced in the new platform of high pass can be made full use of, the DPD calibration carried out is needed to be realized by self-alignment mode when being dispatched from the factory by the mobile communication products such as mobile phone, accelerate the process speed of DPD calibration with this, reduce taking equipment such as comprehensive test instruments, improve calibration efficiency.
Those of ordinary skill in the art it can be appreciated that, the unit of each example described in conjunction with the embodiments described herein and algorithm steps, can with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate the interchangeability of hardware and software, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Those skilled in the art specifically can should be used for using different methods to realize described function to each, but this realization is it is not considered that beyond the scope of this invention.
It should be appreciated by those skilled in the art that the present invention is carried out various amendment, combination, part combination and replaces by responsible design requirement and other factors, as long as in appended claims and equivalency range thereof.
Claims (10)
1. the method being obtained the calibration value that digital pre-distortion (DPD) is calibrated by self calibration, it is applied to terminal unit, wherein said terminal unit includes launching signal power amplifier, transmitting antenna, feedback radio frequency reception (FBRX) unit, and described method includes:
Obtaining input signal, the frequency of wherein said input signal is arranged in the first calibration frequency range of multiple calibration frequency ranges of described terminal unit；
Described transmitting signal power amplifier parameter is set, so that the output signal that described transmitting signal power amplifier generates in response to described input signal enters inelastic region；
Receive the first performance number measured by the measurement device being connected to described terminal unit, the power launching signal that described output signal is launched by wherein said first performance number instruction by described transmitting antenna；
The feedback signal that obtains according to described output signal is measured, to obtain the power of described feedback signal as the second performance number by described feedback radio frequency reception (FBRX) unit；
Calculate the difference of described first performance number and described second performance number, as the described first DPD calibrated under frequency range calibration value calibrated.
2. method according to claim 1, wherein
The corresponding corresponding input signal of each frequency range of the plurality of calibration frequency range and one group arrange parameter accordingly, and produce the calibration value of multiple corresponding DPD calibration with this.
3. method according to claim 1 and 2, described terminal unit also includes depositor, then described method also includes:
Being stored in described depositor by the calibration value that described DPD calibrates, wherein said DPD calibration includes amplitude amplitude (AMAM) and Amplitude & Phase (AMPM)；
When there being the first signal input, call the calibration value of the described DPD calibration of calibration frequency range corresponding with described first signal in described depositor；And
The described DPD calibration value calibrated is used to be calibrated.
4. method according to claim 1 and 2, wherein said arranges the parameter that the output of described transmitting signal power amplifier is relevant, particularly as follows:
For each calibration frequency range, rf gain instruction (RGI) arranged in described terminal unit is calibrate, with corresponding, the fixed value that frequency range is corresponding with baseband gain so that the output signal launching signal power amplifier in this calibration frequency range has been enter into inelastic region.
5. method according to claim 1, wherein
Described feedback signal is proportional to described output signal.
6. a terminal unit, it can obtain, by self calibration mode, the calibration value that digital pre-distortion (DPD) is calibrated, including:
Input block, configuration receives the input signal inputted to described terminal unit, and the frequency of wherein said input signal is arranged in arbitrary calibration frequency range of multiple calibration frequency ranges of described terminal unit；
Parameter set unit, configuration arranges described transmitting signal power amplifier parameter, so that the output signal that described transmitting signal power amplifier generates in response to described input signal enters inelastic region；
Receiving unit, configuration receives the first performance number measured by the measurement device being connected to described terminal unit, the power launching signal that described output signal is launched by wherein said first performance number instruction by described transmitting antenna；
Feedback radio frequency reception (FBRX) unit, the feedback signal obtained according to described output signal is measured in configuration, to obtain the power of described feedback signal as the second performance number；
Computing unit, configuration calculates the difference of described first performance number and described second performance number, and wherein said difference is in order to the calibration value as the DPD calibration calibrated belonging to described input signal under frequency range.
7. method according to claim 6, wherein
The corresponding corresponding input signal of each frequency range of the plurality of calibration frequency range and one group arrange parameter accordingly, and produce the calibration value of multiple corresponding DPD calibration with this.
8. the method according to claim 6 or 7, also includes:
Depositor, configuration stores the calibration value of described DPD calibration, and wherein said DPD calibration includes amplitude amplitude (AMAM) and Amplitude & Phase (AMPM)；
When there being signal to input, call the calibration value of the described DPD calibration of calibration frequency range corresponding with described signal in described depositor；And
The described DPD calibration value calibrated is used to be calibrated.
9. the method according to claim 6 or 7, the parameter that the wherein said output launching signal power amplifier arranged in described terminal unit is relevant, particularly as follows:
For each calibration frequency range, rf gain instruction (RGI) arranged in described terminal unit is calibrate, with corresponding, the fixed value that frequency range is corresponding with baseband gain so that the output signal launching signal power amplifier in this calibration frequency range has been enter into inelastic region.
10. method according to claim 6, wherein
Described feedback signal is proportional to described output signal.
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