CN109088678A - Calibration method, mobile terminal and the storage medium of wireless chip predistortion circuit - Google Patents
Calibration method, mobile terminal and the storage medium of wireless chip predistortion circuit Download PDFInfo
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- CN109088678A CN109088678A CN201811267655.XA CN201811267655A CN109088678A CN 109088678 A CN109088678 A CN 109088678A CN 201811267655 A CN201811267655 A CN 201811267655A CN 109088678 A CN109088678 A CN 109088678A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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Abstract
The application is suitable for wireless communication technology field, provide calibration method, mobile terminal and the computer readable storage medium of a kind of wireless chip predistortion circuit, the described method includes: choosing multiple frequency points in the bandwidth range for the channel that the wireless chip is supported, based on the predistortion circuit, obtain the corresponding offset of test signal of multiple frequency points, calculate the data feature values of the corresponding offset of test signal of multiple frequency points, the offset for obtaining predistortion circuit, the range of linearity of wireless chip can be expanded by the application.
Description
Technical field
The application belong to wireless communication technology field more particularly to a kind of calibration method of wireless chip predistortion circuit,
Mobile terminal and computer readable storage medium.
Background technique
Wireless chip, as the core element of wireless communication, function constantly enhances, and volume is smaller and smaller, and integrated level is more next
Higher, chip technology is also gradually minimizing, and due to the inherent characteristic of electromagnetic wave, integrated circuit RF circuit design is increasingly
It is difficult.The business demands such as the non-linear high-order for limiting modulated signal of radio circuit, broadband, therefore people have studied very much
Improve the nonlinear linear technique of radio circuit, such as digital pre-distortion (DPD, Digital Pre-Distortion) etc..
The nonlinear characteristic for improving wireless chip by the compensation function of digital predistortion circuit, needs to digital pre-distortion
Circuit is calibrated to obtain the offset of digital predistortion circuit, is improved by the offset of the predistortion circuit without core
The nonlinear characteristic of piece.However, the offset obtained at present can not effectively expand the range of linearity of wireless chip.
Summary of the invention
In view of this, the embodiment of the present application provides calibration method, the mobile terminal of a kind of wireless chip predistortion circuit
And computer readable storage medium, the line of wireless chip can not be effectively expanded to solve the offset that current calibration method obtains
The problem of property range.
The first aspect of the embodiment of the present application provides a kind of calibration method of wireless chip predistortion circuit, comprising:
Multiple frequency points are chosen in the bandwidth range for the channel that the wireless chip is supported；
Based on the predistortion circuit, the corresponding offset of test signal of multiple frequency points is obtained；
The data feature values for calculating the corresponding offset of test signal of multiple frequency points, obtain the benefit of predistortion circuit
Repay value.
The second aspect of the embodiment of the present application provides a kind of mobile terminal, comprising:
Frequency point selection unit, for choosing multiple frequency points in the bandwidth range for the channel that the wireless chip is supported；
Frequency point offset obtaining unit obtains the test signal difference of multiple frequency points for being based on the predistortion circuit
Corresponding offset；
Pre-distortion compensated value obtaining unit, the data of the corresponding offset of test signal for calculating multiple frequency points
Characteristic value obtains the offset of predistortion circuit.
The third aspect of the embodiment of the present application provides a kind of mobile terminal, including memory, processor and is stored in
In the memory and the computer program that can run on the processor, when the processor executes the computer program
The step of realizing the method that the embodiment of the present application first aspect provides.
The fourth aspect of the embodiment of the present application provides a kind of computer readable storage medium, the computer-readable storage
Media storage has computer program, and the computer program realizes the embodiment of the present application when being executed by one or more processors
On the one hand the step of the method provided.
5th aspect of the embodiment of the present application provides a kind of computer program product, and the computer program product includes
Computer program, the computer program realize that the embodiment of the present application first aspect provides when being executed by one or more processors
The method the step of.
The embodiment of the present application in the bandwidth range for the channel that wireless chip is supported by choosing multiple frequency points, by described
The predistortion circuit of wireless chip obtains the corresponding offset of test signal of multiple frequency points, calculates the survey of multiple frequency points
The data feature values of the corresponding offset of trial signal, obtain the offset of predistortion circuit, due in the embodiment of the present application
It is to obtain corresponding mend by multiple frequency points by having chosen multiple frequency points in the bandwidth range for the channel that wireless chip is supported
Value is repaid, has then been expanded as pre-distortion compensated value without core in the data feature values for obtaining the corresponding offset of multiple frequency points
The range of linearity of piece.
Detailed description of the invention
It in order to more clearly explain the technical solutions in the embodiments of the present application, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only some of the application
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of implementation process signal of the calibration method of wireless chip predistortion circuit provided by the embodiments of the present application
Figure；
Fig. 2 is that the implementation process of the calibration method of another wireless chip predistortion circuit provided by the embodiments of the present application is shown
It is intended to；
Fig. 3 is a kind of schematic block diagram of predistortion circuit provided by the embodiments of the present application；
Fig. 4 is a kind of schematic block diagram of mobile terminal provided by the embodiments of the present application；
Fig. 5 is the schematic block diagram of another mobile terminal provided by the embodiments of the present application.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, so as to provide a thorough understanding of the present application embodiment.However, it will be clear to one skilled in the art that there is no these specific
The application also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, so as not to obscure the description of the present application with unnecessary details.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " instruction is described special
Sign, entirety, step, operation, the presence of element and/or component, but be not precluded one or more of the other feature, entirety, step,
Operation, the presence or addition of element, component and/or its set.
It is also understood that mesh of the term used in this present specification merely for the sake of description specific embodiment
And be not intended to limit the application.As present specification and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise " one " of singular, "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in present specification and the appended claims is
Refer to any combination and all possible combinations of one or more of associated item listed, and including these combinations.
As used in this specification and in the appended claims, term " if " can be according to context quilt
Be construed to " when ... " or " once " or " in response to determination " or " in response to detecting ".Similarly, phrase " if it is determined that " or
" if detecting [described condition or event] " can be interpreted to mean according to context " once it is determined that " or " in response to true
It is fixed " or " once detecting [described condition or event] " or " in response to detecting [described condition or event] ".
In order to illustrate technical solution described herein, the following is a description of specific embodiments.
Fig. 1 is a kind of implementation process signal of the calibration method of wireless chip predistortion circuit provided by the embodiments of the present application
Figure, as shown, method includes the following steps:
Step S101 chooses multiple frequency points in the bandwidth range for the channel that the wireless chip is supported.
In the embodiment of the present application, the wireless chip can be the chip applied to wireless communication, such as WIFI chip.
By taking WIFI chip as an example, the bandwidth range for each channel that WIFI chip is supported is 20MHZ, can be in the bandwidth model of 20MHZ
Enclose it is interior choose multiple frequency points, for example, center frequency point in 20MHZ bandwidth range, deviate center frequency point ± 2.5MHz, ± 5MHz,
The frequency point of ± 7.5MHz amounts to 7 frequency points；6 frequency points can also be therefrom selected, for example, deviation center frequency point ± 0.6MHz, ±
6 frequency points of 5MHz, ± 10MHz.Certainly, in practical application, it is also an option that the frequency point of other quantity, herein with no restrictions.
As another embodiment of the application, chosen in the bandwidth range of the channel supported in the wireless chip multiple
Frequency point includes:
The local frequency for controlling the wireless chip is constant, in the bandwidth range for the channel that the wireless chip is supported
It is interior, multiple frequency points are obtained by way of modulation /demodulation；
Or,
In the bandwidth range for the channel that the wireless chip is supported, the local frequency for controlling the wireless chip is pressed
It deviates according to preset step-length to obtain multiple frequency points.
It in the embodiment of the present application, can be with, there are local oscillation circuit, local oscillation circuit can produce local frequency in wireless chip.
The local frequency that can control wireless chip is constant, the band for the channel supported by way of modulation /demodulation in wireless chip
Multiple frequency points are obtained in wide scope, the generation of frequency point is related with the frequency point generation function inside wireless chip；Also it can control nothing
The local frequency of core piece changes, for example, control local frequency deviates to obtain multiple frequency points according to preset step-length, beats frequency point
Process can elapsed time, will affect WIFI calibration timing if time span is too big, therefore, the quantity of the frequency point of selection is not
It is suitable for too many.
Step S102 is based on the predistortion circuit, obtains the corresponding offset of test signal of multiple frequency points.
In the embodiment of the present application, usually there is predistortion circuit in wireless chip, can be simulated pre-distortion circuit,
It can be digital predistortion circuit, the embodiment of the present application can be applied to digital predistortion circuit, for example, by predistortion module
(Predistorter) it is built in digital, digital base band signal process domain with power amplifier module (PA) cascade, predistortion module,
It is suitable (" equal ") with the distortion quantity that power amplifier module is shown, but function is opposite.The two non-linear distortion functions are (pre- to lose
True and power amplifier) it combines, it just can be realized highly linear, undistorted system.In order to solve above-mentioned deviation, we must use anti-
Infeed mechanism samples output signal, and to correct the algorithm inside predistortion module.Digital pre-distortion is using number electricity
This predistortion (Predistorter) is realized on road, generallys use Digital Signal Processing to complete.It is non-linear by increasing by one
Circuit is to compensate the non-linear of power amplifier.Based on above-mentioned predistortion circuit, so that it may obtain the test of each frequency point
The corresponding offset of signal.
Step S103 calculates the data feature values of the corresponding offset of test signal of multiple frequency points, obtains pre- lose
The offset of true circuit.
In the embodiment of the present application, each frequency point can correspond to an offset, and multiple frequency points will correspond to multiple compensation
Value, the data feature values for calculating the corresponding offset of multiple frequency points, which can be, calculates the corresponding data spy of multiple frequency points
The average value of value indicative in practical application, can also be the intermediate value for calculating the corresponding data feature values of multiple frequency points certainly.
Data feature values are not defined herein.The data feature values of acquisition can be used as the offset of predistortion circuit.Pass through institute
The offset for stating predistortion circuit improves the nonlinear characteristic of wireless chip.
It is to be led in the embodiment of the present application by having chosen multiple frequency points in the bandwidth range for the channel that wireless chip is supported
It crosses multiple frequency points and obtains corresponding offset, then lost in the data feature values for obtaining the corresponding offset of multiple frequency points as pre-
True offset, to expand the range of linearity of wireless chip.
Fig. 2 is a kind of implementation process of the calibration method for wireless chip predistortion circuit that another embodiment of the application provides
Schematic diagram, as shown, on the basis of this method embodiment shown in Fig. 1, it is described how be based on the predistortion circuit, obtain
The corresponding offset of test signal for obtaining multiple frequency points, can specifically include following steps:
Step S201, in the corresponding offset of the test signal that calculates a frequency point in multiple frequency points, by losing in advance
True circuit obtains output power of the test signal of current frequency point under initial gain.
In the embodiment of the present application, the predistortion circuit includes: sequentially connected predistortion module, initial gain mould
Block, power amplifier module；In practical application, the output connection feedback module (being used for power detection) of the power amplifier module, the feedback
The output of module is connect with the input of the predistortion module.
As shown in figure 3, being a kind of schematic block diagram of predistortion circuit provided by the embodiments of the present application；The predistortion circuit
It include: sequentially connected predistortion module (DPD module), initial gain module, power amplifier module (PA), in the output of power amplifier module
The feedback module for being used for power detection is connected between the input of predistortion module.
It can lead in output power of the test signal for obtaining current frequency point by predistortion circuit under initial gain
The predistortion module crossed in the predistortion circuit generates the test signal of current frequency point, passes through initial gain module and power amplifier mould
Output power of the block to the test signal for obtaining current frequency point after the testing signal process.
In the embodiment of the present application, the predistortion module of predistortion circuit can produce the test signal of current frequency point,
When wireless chip is switched on, initial yield value can be set to initial gain module, successively by initial gain module and power amplifier module
Processing is carried out to the test signal and obtains output signal, feedback module can carry out function to the output signal that power amplifier module exports
Rate detection, to obtain the output power of the test signal of current frequency point.
Step S202, judges whether output power of the test signal of current frequency point under initial gain meets default item
Part.
In the embodiment of the present application, it can be determined that whether output power of the test signal of current frequency point under initial gain
Reach saturation power.The output power of test signal can indicate currently to test signal in the energy of the frequency point, judge current frequency
Whether output power of the test signal of point under initial gain meets preset condition it can be understood that being the test of current frequency point
Whether output power of the signal under initial gain has reached ceiling capacity.If ceiling capacity can be reached, indicate in the frequency
Overall power consumption of the test signal of point under current gain is minimum, while the interference being subject to is also minimum.
Step S203, if output power of the test signal of current frequency point under initial gain meets preset condition, base
The corresponding offset of test signal of current frequency point is obtained in the initial gain.
In the embodiment of the present application, the corresponding offset of different gains is pre-set in wireless chip, such as is set
The form for being set to excel table saves, and can also be saved in the form of key-value key-value pair, current frequency point is being determined
Signal is tested after the output power of current yield value (initial gain) reaches saturation power, so that it may current according to lookup
The corresponding offset of yield value.
Step S204, if output power of the test signal of current frequency point under initial gain is unsatisfactory for preset condition,
Adjust the initial gain, until the output power under the test signal initial gain after the adjustment of current frequency point meet it is default
Condition, and obtain based on initial gain adjusted the corresponding offset of test signal of current frequency point.
In the embodiment of the present application, if output power of the test signal of current frequency point under initial gain is unsatisfactory for presetting
Condition, then it represents that current yield value (initial gain) is not most suitable yield value, and adjustable current yield value (is adjusted
Whole initial gain), if the output power under the initial gain of the test signal of current frequency point after the adjustment meets preset condition,
The corresponding offset of test signal of current frequency point is obtained based on initial gain adjusted.If the test signal of current frequency point exists
Output power under initial gain adjusted still not satisfies preset condition, then continues to adjust current yield value, until working as
Output power under the initial gain of the test signal of preceding frequency point after the adjustment meets preset condition, and based on adjusted initial
Gain obtains the corresponding offset of test signal of current frequency point.The test letter of multiple frequency points of selection is obtained according to the method
Number corresponding offset.
It should be understood that the size of the serial number of each step is not meant that the order of the execution order in above-described embodiment, each process
Execution sequence should be determined by its function and internal logic, the implementation process without coping with the embodiment of the present application constitutes any limit
It is fixed.
Fig. 4 is a kind of schematic block diagram of mobile terminal provided by the embodiments of the present application, for ease of description, is only shown and this
Apply for the relevant part of embodiment.
The mobile terminal 4 can be the software unit being built in the mobile terminals such as mobile phone, tablet computer, notebook, hard
Part unit or the unit of soft or hard combination can also be used as independent pendant and be integrated into the mobile phone, tablet computer, notebook etc.
In mobile terminal.
The mobile terminal 4 includes:
Frequency point selection unit 41, for choosing multiple frequency points in the bandwidth range for the channel that the wireless chip is supported；
Frequency point offset obtaining unit 42 obtains the test signal point of multiple frequency points for being based on the predistortion circuit
Not corresponding offset；
Pre-distortion compensated value obtaining unit 43, the number of the corresponding offset of test signal for calculating multiple frequency points
According to characteristic value, the offset of predistortion circuit is obtained.
As another embodiment of the application, the frequency point selection unit 41 is also used to:
The local frequency for controlling the wireless chip is constant, in the bandwidth range for the channel that the wireless chip is supported
It is interior, multiple frequency points are obtained by way of modulation /demodulation.
As another embodiment of the application, the frequency point selection unit 41 is also used to:
In the bandwidth range for the channel that the wireless chip is supported, the local frequency for controlling the wireless chip is pressed
It deviates according to preset step-length to obtain multiple frequency points.
As another embodiment of the application, the frequency point offset obtaining unit 42 includes:
Output power obtains subelement 421, for corresponding in the test signal for calculating a frequency point in multiple frequency points
When offset, output power of the test signal of current frequency point under initial gain is obtained by predistortion circuit；
Judgment sub-unit 422, for judging whether output power of the test signal of current frequency point under initial gain be full
Sufficient preset condition；
Frequency point offset obtains subelement 423, if output work of the test signal for current frequency point under initial gain
Rate meets preset condition, then the corresponding offset of test signal of current frequency point is obtained based on the initial gain；
Frequency point offset obtains subelement 423, if being also used to output of the test signal of current frequency point under initial gain
Power is unsatisfactory for preset condition, then adjusts the initial gain, until the test signal initial increasing after the adjustment of current frequency point
Output power under benefit meets preset condition, and corresponding based on the test signal that initial gain adjusted obtains current frequency point
Offset.
As another embodiment of the application, the predistortion circuit includes: sequentially connected predistortion module, initial gain
Module, power amplifier module；
The output power obtains subelement 421 and is also used to:
The test signal that current frequency point is generated by the predistortion module in the predistortion circuit, passes through initial gain mould
The output power of block and power amplifier module to the test signal for obtaining current frequency point after the testing signal process.
As another embodiment of the application, the judgment sub-unit 422 is also used to:
Judge whether output power of the test signal of current frequency point under initial gain reaches saturation power.
As another embodiment of the application, the frequency point selection unit 41 is also used to:
The wireless chip support channel bandwidth range in Selection Center frequency point, be respectively offset from center frequency point ±
7 frequency points of 2.5MHz, ± 5MHz, ± 7.5MHz；
Alternatively,
The wireless chip support channel bandwidth range in choose deviate center frequency point ± 0.6MHz, ± 5MHz,
6 frequency points of ± 10MHz.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each function
Can unit, module division progress for example, in practical application, can according to need and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of the mobile terminal is divided into different functional unit or module, to complete
All or part of function described above.Each functional unit in embodiment, module can integrate in one processing unit,
It is also possible to each unit to physically exist alone, can also be integrated in one unit with two or more units, above-mentioned collection
At unit both can take the form of hardware realization, can also realize in the form of software functional units.In addition, each function
Unit, module specific name be also only for convenience of distinguishing each other, the protection scope being not intended to limit this application.Above-mentioned shifting
The specific work process for moving unit in terminal, module, can refer to corresponding processes in the foregoing method embodiment, no longer superfluous herein
It states.
Fig. 5 is the schematic block diagram of another mobile terminal provided by the embodiments of the present application.As shown in figure 5, the embodiment
Mobile terminal 5 includes: one or more processors 50, memory 51 and is stored in the memory 51 and can be at the place
The computer program 52 run on reason device 50.The processor 50 realizes above-mentioned each method when executing the computer program 52
Step in embodiment, such as step S101 to S103 shown in FIG. 1.Alternatively, the processor 50 executes the computer journey
The function of each module/unit in above-mentioned mobile terminal embodiment, such as the function of module 41 to 43 shown in Fig. 4 are realized when sequence 52.
Illustratively, the computer program 52 can be divided into one or more module/units, it is one or
Multiple module/units are stored in the memory 51, and are executed by the processor 50, to complete the application.Described one
A or multiple module/units can be the series of computation machine program instruction section that can complete specific function, which is used for
Implementation procedure of the computer program 52 in the mobile terminal 5 is described.For example, the computer program 52 can be divided
It is cut into frequency point selection unit, frequency point offset obtaining unit, pre-distortion compensated value obtaining unit.
The frequency point selection unit, for choosing multiple frequencies in the bandwidth range for the channel that the wireless chip is supported
Point；
The frequency point offset obtaining unit obtains the test signal of multiple frequency points for being based on the predistortion circuit
Corresponding offset；
The pre-distortion compensated value obtaining unit, for calculating the test signal corresponding offset of multiple frequency points
Data feature values obtain the offset of predistortion circuit.
Other units or subelement (module) can refer to the description in embodiment shown in Fig. 4, and details are not described herein.
The mobile terminal includes but are not limited to processor 50, memory 51.It will be understood by those skilled in the art that figure
5 be only an example of mobile terminal 5, does not constitute the restriction to mobile terminal 5, may include more more or less than illustrating
Component, perhaps combine certain components or different components, for example, the mobile terminal can also include input equipment, it is defeated
Equipment, network access equipment, bus etc. out.
The processor 50 can be central processing unit (Central Processing Unit, CPU), can also be
Other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor
Deng.
The memory 51 can be the internal storage unit of the mobile terminal 5, such as the hard disk or interior of mobile terminal 5
It deposits.The memory 51 is also possible to the External memory equipment of the mobile terminal 5, such as be equipped on the mobile terminal 5
Plug-in type hard disk, intelligent memory card (Smart Media Card, SMC), secure digital (Secure Digital, SD) card dodge
Deposit card (Flash Card) etc..Further, the memory 51 can also both include the storage inside list of the mobile terminal 5
Member also includes External memory equipment.The memory 51 is for storing needed for the computer program and the mobile terminal
Other programs and data.The memory 51 can be also used for temporarily storing the data that has exported or will export.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
Scope of the present application.
In embodiment provided herein, it should be understood that disclosed mobile terminal and method can pass through it
Its mode is realized.For example, mobile terminal embodiment described above is only schematical, for example, the module or list
Member division, only a kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or
Component can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point is shown
The mutual coupling or direct-coupling or communication connection shown or discussed can be through some interfaces, between device or unit
Coupling or communication connection are connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated module/unit be realized in the form of SFU software functional unit and as independent product sale or
In use, can store in a computer readable storage medium.Based on this understanding, the application realizes above-mentioned implementation
All or part of the process in example method, can also instruct relevant hardware to complete, the meter by computer program
Calculation machine program can be stored in a computer readable storage medium, the computer program when being executed by processor, it can be achieved that on
The step of stating each embodiment of the method.Wherein, the computer program includes computer program code, the computer program generation
Code can be source code form, object identification code form, executable file or certain intermediate forms etc..The computer-readable medium
It may include: any entity or device, recording medium, USB flash disk, mobile hard disk, magnetic that can carry the computer program code
Dish, CD, computer storage, read-only memory (ROM, Read-Only Memory), random access memory (RAM,
Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium etc..It should be noted that described
The content that computer-readable medium includes can carry out increasing appropriate according to the requirement made laws in jurisdiction with patent practice
Subtract, such as in certain jurisdictions, according to legislation and patent practice, computer-readable medium do not include be electric carrier signal and
Telecommunication signal.
Embodiment described above is only to illustrate the technical solution of the application, rather than its limitations；Although referring to aforementioned reality
Example is applied the application is described in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution should all
Comprising within the scope of protection of this application.
Claims (10)
1. a kind of calibration method of wireless chip predistortion circuit characterized by comprising
Multiple frequency points are chosen in the bandwidth range for the channel that the wireless chip is supported；
Based on the predistortion circuit, the corresponding offset of test signal of multiple frequency points is obtained；
The data feature values for calculating the corresponding offset of test signal of multiple frequency points, obtain the compensation of predistortion circuit
Value.
2. the calibration method of wireless chip predistortion circuit as described in claim 1, which is characterized in that described described wireless
Multiple frequency points are chosen in the bandwidth range for the channel that chip is supported includes:
The local frequency for controlling the wireless chip is constant, in the bandwidth range for the channel that the wireless chip is supported,
Multiple frequency points are obtained by way of modulation /demodulation.
3. the calibration method of wireless chip predistortion circuit as described in claim 1, which is characterized in that described described wireless
Multiple frequency points are chosen in the bandwidth range for the channel that chip is supported includes:
In the bandwidth range for the channel that the wireless chip is supported, the local frequency of the wireless chip is controlled according to pre-
If step-length is deviated to obtain multiple frequency points.
4. the calibration method of wireless chip predistortion circuit as described in claim 1, which is characterized in that described based on described pre-
Distortion circuit, the corresponding offset of test signal for obtaining multiple frequency points include:
In the corresponding offset of the test signal that calculates a frequency point in multiple frequency points, obtained by predistortion circuit current
Output power of the test signal of frequency point under initial gain；
Judge whether output power of the test signal of current frequency point under initial gain meets preset condition；
If output power of the test signal of current frequency point under initial gain meets preset condition, it is based on the initial gain
Obtain the corresponding offset of test signal of current frequency point；
If output power of the test signal of current frequency point under initial gain is unsatisfactory for preset condition, the initial increasing is adjusted
Benefit, until the output power under the test signal initial gain after the adjustment of current frequency point meets preset condition, and based on adjusting
Initial gain after whole obtains the corresponding offset of test signal of current frequency point.
5. the calibration method of wireless chip predistortion circuit as claimed in claim 4, which is characterized in that the predistortion circuit
It include: sequentially connected predistortion module, initial gain module, power amplifier module；
It is described output power of the test signal of current frequency point under initial gain is obtained by predistortion circuit to include:
The test signal that current frequency point is generated by the predistortion module in the predistortion circuit, by initial gain module and
Output power of the power amplifier module to the test signal for obtaining current frequency point after the testing signal process.
6. the calibration method of wireless chip predistortion circuit as claimed in claim 4, which is characterized in that the current frequency of judgement
Whether output power of the test signal of point under initial gain, which meets preset condition, includes:
Judge whether output power of the test signal of current frequency point under initial gain reaches saturation power.
7. such as the calibration method of wireless chip predistortion circuit as claimed in any one of claims 1 to 6, which is characterized in that described
Choosing multiple frequency points in the bandwidth range for the channel that the wireless chip is supported includes:
The wireless chip support channel bandwidth range in Selection Center frequency point, be respectively offset from center frequency point ±
7 frequency points of 2.5MHz, ± 5MHz, ± 7.5MHz；
Alternatively,
The wireless chip support channel bandwidth range in choose deviate center frequency point ± 0.6MHz, ± 5MHz, ±
6 frequency points of 10MHz.
8. a kind of mobile terminal characterized by comprising
Frequency point selection unit, for choosing multiple frequency points in the bandwidth range for the channel that the wireless chip is supported；
Frequency point offset obtaining unit, for being based on the predistortion circuit, the test signal for obtaining multiple frequency points is respectively corresponded
Offset；
Pre-distortion compensated value obtaining unit, the data characteristics of the corresponding offset of test signal for calculating multiple frequency points
Value, obtains the offset of predistortion circuit.
9. a kind of mobile terminal, including memory, processor and storage are in the memory and can be on the processor
The computer program of operation, which is characterized in that the processor realizes such as claim 1 to 7 when executing the computer program
The step of any one the method.
10. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has computer journey
Sequence realizes the step such as any one of claim 1 to 7 the method when the computer program is executed by one or more processors
Suddenly.
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