CN106789792B - Wifi frequency offset adjusting method and terminal - Google Patents
Wifi frequency offset adjusting method and terminal Download PDFInfo
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- CN106789792B CN106789792B CN201710161895.0A CN201710161895A CN106789792B CN 106789792 B CN106789792 B CN 106789792B CN 201710161895 A CN201710161895 A CN 201710161895A CN 106789792 B CN106789792 B CN 106789792B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0018—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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Abstract
The invention discloses a method and a terminal for adjusting Wifi frequency offset, wherein the method comprises the following steps: acquiring a current communication signal frequency value; calculating the difference value between the current communication signal frequency value and the theoretical optimal communication frequency value; and if the absolute value of the difference is larger than a preset value, adjusting the capacitance value of the grounding capacitor applied to the crystal oscillator connected with the Wifi module so as to enable the difference to be smaller than the preset value. The terminal comprises a Wifi module; the frequency acquisition unit is used for acquiring the frequency value of the current communication signal; the microprocessor is used for calculating the difference value between the current communication signal frequency value and the theoretical optimal communication frequency value and judging whether the absolute value of the difference value is greater than a preset value or not; and the digital-to-analog converter is used for adjusting the voltage value of the grounding capacitor applied to the crystal oscillator connected with the Wifi module. The invention can ensure the stability of Wifi communication, effectively avoid the problem of abnormal signal interruption caused by Wifi frequency offset and improve user experience.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method and a terminal for adjusting Wifi frequency offset.
Background
With the development of science and technology, the integration level of chips is higher and higher, and new technical schemes are more endlessly developed. Terminals, for example: the functions of mobile phones, tablet computers, watch, notebook computers, desktop computers and the like in life are increasingly irreplaceable. With the advent of the 4G era, Wifi has almost become the standard configuration of terminals. At present, part of users feed back Wifi, and the Wifi is often disconnected after being connected.
Wifi communication refers to the connection between terminal and route, and with the technology more and more advanced, the index of user's use Wifi is also higher and higher. At present, main indexes of Wifi communication relate to frequency offset, power, sensitivity and the like.
And the frequency offset refers to the difference between the actual communication frequency and the theoretical communication frequency. When the difference exceeds a certain range, the communication error rate is too large due to too large frequency difference, so that the communication cannot be performed.
Disclosure of Invention
The invention mainly aims to provide a method and a terminal for adjusting Wifi frequency offset, aiming at adjusting the communication frequency of Wifi to enable errors to be smaller and further realize data transmission better and more stably.
In order to achieve the above object, the present invention provides a method for adjusting Wifi frequency offset, which is applied to a terminal having a Wifi module, and is characterized by comprising:
acquiring a current communication signal frequency value;
calculating the difference value between the current communication signal frequency value and the theoretical optimal communication frequency value;
and if the absolute value of the difference is larger than a preset value, adjusting the voltage value applied to a tuning capacitor so that the difference is smaller than the preset value, wherein the tuning capacitor is the grounding capacitor of a crystal oscillator connected with the Wifi module.
Optionally, the obtaining the current communication signal frequency value includes:
acquiring the current communication signal;
amplifying the current communication signal;
carrying out square wave shaping processing on the amplified communication signal;
and reading the frequency of the communication signal subjected to the square wave shaping processing as the current communication signal frequency value.
Optionally, if the absolute value of the difference is greater than a preset value, adjusting the voltage value applied to the tuning capacitor includes:
if the difference value is larger than zero and the absolute value of the difference value is larger than a preset value, reducing the voltage value by at least one voltage stepping value;
and if the difference is smaller than zero and the absolute value of the difference is larger than a preset value, increasing the voltage value by at least one voltage stepping value.
Optionally, if the absolute value of the difference is greater than a preset value, adjusting the voltage value applied to the tuning capacitor includes:
if the difference value is larger than zero, and the absolute value of the difference value is larger than a first preset value and smaller than a second preset value, reducing the voltage value by a voltage stepping value;
if the difference is larger than zero and the absolute value of the difference is larger than or equal to the second preset value, reducing the voltage value by at least two voltage stepping values;
if the difference is smaller than zero, and the absolute value of the difference is larger than a first preset value and smaller than a second preset value, increasing a voltage stepping value to the voltage value;
and if the difference is smaller than zero and the absolute value of the difference is larger than or equal to the second preset value, increasing the voltage value by at least two voltage stepping values.
Optionally, the voltage step value is not greater than 0.05V.
In addition, in order to achieve the above object, the present invention further provides a terminal, including a Wifi module, characterized by comprising:
the frequency acquisition unit is used for acquiring the frequency value of the current communication signal;
the microprocessor is used for calculating the difference value between the current communication signal frequency value and the theoretical optimal communication frequency value and judging whether the absolute value of the difference value is greater than a preset value or not;
and the digital-to-analog converter is used for adjusting the voltage value applied to the tuning capacitor if the absolute value of the difference is greater than a preset value so as to enable the difference to be smaller than the preset value, wherein the tuning capacitor is the grounding capacitor of the crystal oscillator connected with the Wifi module.
Optionally, the frequency obtaining unit includes:
an obtaining module, configured to obtain the current communication signal;
the amplifying module is used for amplifying the current communication signal;
the shaping module is used for carrying out square wave shaping processing on the amplified communication signal;
and the measuring module is used for reading the frequency of the communication signal subjected to the square wave shaping processing as the frequency value of the current communication signal.
Optionally, the microprocessor is configured to:
if the difference is larger than zero and the absolute value of the difference is larger than a preset value, controlling the digital-to-analog converter to reduce the voltage value by at least one voltage stepping value;
and if the difference is smaller than zero and the absolute value of the difference is larger than a preset value, controlling the digital-to-analog converter to increase the voltage value by at least one voltage stepping value.
Optionally, the microprocessor is configured to:
if the difference is larger than zero, and the absolute value of the difference is larger than a first preset value and smaller than a second preset value, controlling the digital-to-analog converter to reduce the voltage value by a voltage stepping value;
if the difference is larger than zero and the absolute value of the difference is larger than or equal to the second preset value, controlling the digital-to-analog converter to reduce the voltage value by at least two voltage stepping values;
if the difference is smaller than zero, and the absolute value of the difference is larger than a first preset value and smaller than a second preset value, controlling the digital-to-analog converter to increase the voltage value by a voltage stepping value;
and if the difference is smaller than zero and the absolute value of the difference is larger than or equal to the second preset value, controlling the digital-to-analog converter to increase the voltage value by at least two voltage stepping values.
Optionally, the voltage step value is not greater than 0.05V.
According to the method and the terminal for adjusting the Wifi frequency offset, the Wifi frequency is adjusted by adjusting the voltage value of the grounding capacitor applied to the crystal oscillator connected with the Wifi module, the Wifi communication stability is ensured, the problem of abnormal signal interruption caused by the Wifi frequency offset can be effectively solved, and the user experience is improved.
Drawings
Fig. 1 is a schematic diagram of a hardware structure of a mobile terminal implementing various embodiments of the present invention;
fig. 2 is a flowchart illustrating an embodiment of a Wifi frequency offset adjustment method according to the present invention;
fig. 3 is a partial flowchart of another embodiment of a Wifi frequency offset adjustment method of the present invention;
fig. 4 is a partial flowchart of another embodiment of a Wifi frequency offset adjustment method of the present invention;
fig. 5 is a partial flowchart of another embodiment of a Wifi frequency offset adjustment method of the present invention;
fig. 6 is a schematic structural diagram of an embodiment of the terminal of the present invention;
fig. 7 is a schematic structural diagram of another embodiment of the terminal of the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A mobile terminal implementing various embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
The mobile terminal may be implemented in various forms. For example, the terminal described in the present invention may include a mobile terminal such as a mobile phone, a smart phone, a notebook computer, a digital broadcast receiver, a PDA (personal digital assistant), a PAD (tablet computer), a PMP (portable multimedia player), a navigation device, and the like, and a stationary terminal such as a digital TV, a desktop computer, and the like. In the following, it is assumed that the terminal is a mobile terminal. However, it will be understood by those skilled in the art that the configuration according to the embodiment of the present invention can be applied to a fixed type terminal in addition to elements particularly used for moving purposes.
Fig. 1 is a schematic diagram of a hardware structure of an optional intelligent terminal for implementing various embodiments of the present invention.
The smart terminal 100 may include a wireless communication unit 110, an a/V (audio/video) input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, a memory 160, an interface unit 170, a controller 180, and a power supply unit 190, etc.
Fig. 1 illustrates the mobile terminal 100 having various components, but it is to be understood that not all illustrated components are required to be implemented. More or fewer components may alternatively be implemented. The elements of the mobile terminal 100 will be described in detail below.
The wireless communication unit 110 may generally include one or more components that allow radio communication between the mobile terminal 100 and a wireless communication system or network. For example, the wireless communication unit 110 may include at least one of a broadcast receiving module 111, a mobile communication module 112, a wireless internet module 113, a short-range communication module 114, and a location information module 115.
The broadcast receiving module 111 receives a broadcast signal and/or broadcast associated information from an external broadcast management server via a broadcast channel. The broadcast channel may include a satellite channel and/or a terrestrial channel. The broadcast management server may be a server that generates and transmits a broadcast signal and/or broadcast associated information or a server that receives a previously generated broadcast signal and/or broadcast associated information and transmits it to a terminal. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and the like. Also, the broadcast signal may further include a broadcast signal combined with a TV or radio broadcast signal. The broadcast associated information may also be provided via a mobile communication network, and in this case, the broadcast associated information may be received by the mobile communication module 112. The broadcast signal may exist in various forms, for example, it may exist in the form of an Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB), an Electronic Service Guide (ESG) of digital video broadcasting-handheld (DVB-H), and the like. The broadcast receiving module 111 may receive a signal broadcast by using various types of broadcasting systems. In particular, the broadcast receiving module 111 may receive digital broadcasting by using a digital broadcasting system such as a data broadcasting system of multimedia broadcasting-terrestrial (DMB-T), digital multimedia broadcasting-satellite (DMB-S), digital video broadcasting-handheld (DVB-H), forward link media (MediaFLO @), terrestrial digital broadcasting integrated service (ISDB-T), and the like. The broadcast receiving module 111 may be constructed to be suitable for various broadcasting systems that provide broadcast signals as well as the above-mentioned digital broadcasting systems. The broadcast signal and/or broadcast associated information received via the broadcast receiving module 111 may be stored in the memory 160 (or other type of storage medium).
The mobile communication module 112 transmits and/or receives radio signals to and/or from at least one of a base station (e.g., access point, node B, etc.), an external terminal, and a server. Such radio signals may include voice call signals, video call signals, or various types of data transmitted and/or received according to text and/or multimedia messages.
The wireless internet module 113 supports wireless internet access of the mobile terminal. The module may be internally or externally coupled to the terminal. The wireless internet access technology to which the module relates may include WLAN (wireless LAN) (Wi-Fi), Wibro (wireless broadband), Wimax (worldwide interoperability for microwave access), HSDPA (high speed downlink packet access), and the like.
The short-range communication module 114 is a module for supporting short-range communication. Some examples of short-range communication technologies include bluetooth (TM), Radio Frequency Identification (RFID), infrared data association (IrDA), Ultra Wideband (UWB), zigbee (TM), and the like.
The location information module 115 is a module for checking or acquiring location information of the mobile terminal. A typical example of the location information module 115 is a GPS (global positioning system). According to the current technology, the GPS calculates distance information and accurate time information from three or more satellites and applies triangulation to the calculated information, thereby accurately calculating three-dimensional current location information according to longitude, latitude, and altitude. Currently, a method for calculating position and time information uses three satellites and corrects errors of the calculated position and time information by using another satellite. In addition, the GPS can calculate speed information by continuously calculating current position information in real time.
The a/V input unit 120 is used to receive an audio or video signal. The a/V input unit 120 may include a camera 121 and a microphone 122, and the camera 121 processes image data of a still picture or a video obtained by an image capturing apparatus in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 151. The image frames processed by the cameras 121 may be stored in the memory 160 (or other storage medium) or transmitted via the wireless communication unit 110, and two or more cameras 121 may be provided according to the construction of the mobile terminal 100. The microphone 122 may receive sounds (audio data) via the microphone 122 in a phone call mode, a recording mode, a voice recognition mode, or the like, and can process such sounds into audio data. The processed audio (voice) data may be converted into a format output transmittable to a mobile communication base station via the mobile communication module 112 in case of a phone call mode. The microphone 122 may implement various types of noise cancellation (or suppression) algorithms to cancel (or suppress) noise or interference generated in the course of receiving and transmitting audio signals.
The user input unit 130 may generate key input data to control various operations of the mobile terminal 100 according to a command input by a user. The user input unit 130 allows a user to input various types of information, and may include a keyboard, dome sheet, touch pad (e.g., a touch-sensitive member that detects changes in resistance, pressure, capacitance, and the like due to being touched), scroll wheel, joystick, and the like. In particular, when the touch pad is superimposed on the display unit 151 in the form of a layer, a touch screen may be formed.
The sensing unit 140 detects a current state of the mobile terminal 100 (e.g., an open or closed state of the mobile terminal 100), a position of the mobile terminal 100, presence or absence of contact (i.e., touch input) by a user with the mobile terminal 100, an orientation of the mobile terminal 100, acceleration or deceleration movement and direction of the mobile terminal 100, and the like, and generates a command or signal for controlling an operation of the mobile terminal 100. For example, when the mobile terminal 100 is implemented as a slide-type mobile phone, the sensing unit 140 may sense whether the slide-type phone is opened or closed. In addition, the sensing unit 140 can detect whether the power supply unit 190 supplies power or whether the interface unit 170 is coupled with an external device. The sensing unit 140 may include a proximity sensor 141.
The interface unit 170 serves as an interface through which at least one external device is connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The identification module may store various information for authenticating a user using the mobile terminal 100 and may include a User Identity Module (UIM), a Subscriber Identity Module (SIM), a Universal Subscriber Identity Module (USIM), and the like. In addition, a device having an identification module (hereinafter, referred to as an "identification device") may take the form of a smart card, and thus, the identification device may be connected with the mobile terminal 100 via a port or other connection means. The interface unit 170 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal 100 and the external device.
In addition, when the mobile terminal 100 is connected with an external cradle, the interface unit 170 may serve as a path through which power is supplied from the cradle to the mobile terminal 100 or may serve as a path through which various command signals input from the cradle are transmitted to the mobile terminal 100. Various command signals or power input from the cradle may be used as a signal for identifying whether the mobile terminal 100 is accurately mounted on the cradle. The output unit 150 is configured to provide output signals (e.g., audio signals, video signals, alarm signals, vibration signals, etc.) in a visual, audio, and/or tactile manner. The output unit 150 may include a display unit 151, an audio output module 152, an alarm unit 153, and the like.
The display unit 151 may display information processed in the mobile terminal 100. For example, when the mobile terminal 100 is in a phone call mode, the display unit 151 may display a User Interface (UI) or a Graphical User Interface (GUI) related to a call or other communication (e.g., text messaging, multimedia file downloading, etc.). When the mobile terminal 100 is in a video call mode or an image capturing mode, the display unit 151 may display a captured image and/or a received image, a UI or GUI showing a video or an image and related functions, and the like.
Meanwhile, when the display unit 151 and the touch pad are overlapped with each other in the form of a layer to form a touch screen, the display unit 151 may serve as an input device and an output device. The display unit 151 may include at least one of a Liquid Crystal Display (LCD), a thin film transistor LCD (TFT-LCD), an Organic Light Emitting Diode (OLED) display, a flexible display, a three-dimensional (3D) display, and the like. Some of these displays may be configured to be transparent to allow a user to view from the outside, which may be referred to as transparent displays, and a typical transparent display may be, for example, a TOLED (transparent organic light emitting diode) display or the like. Depending on the particular desired implementation, mobile terminal 100 may include two or more display units (or other display devices), for example, mobile terminal 100 may include an external display unit (not shown) and an internal display unit (not shown). The touch screen may be used to detect a touch input pressure as well as a touch input position and a touch input area.
The audio output module 152 may convert audio data received by the wireless communication unit 110 or stored in the memory 160 into an audio signal and output as sound when the mobile terminal 100 is in a call signal reception mode, a call mode, a recording mode, a voice recognition mode, a broadcast reception mode, or the like. Also, the audio output module 152 may provide audio output related to a specific function performed by the mobile terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output module 152 may include a speaker, a buzzer, and the like.
The alarm unit 153 may provide an output to notify the mobile terminal 100 of the occurrence of an event. Typical events may include call reception, message reception, key signal input, touch input, and the like. In addition to audio or video output, the alarm unit 153 may provide output in different ways to notify the occurrence of an event. For example, the alarm unit 153 may provide an output in the form of vibration, and when a call, a message, or some other incoming communication (communicating communication) is received, the alarm unit 153 may provide a tactile output (i.e., vibration) to inform the user thereof. By providing such a tactile output, the user can recognize the occurrence of various events even when the user's mobile phone is in the user's pocket. The alarm unit 153 may also provide an output notifying the occurrence of an event via the display unit 151 or the audio output module 152.
The memory 160 may store software programs and the like for processing and controlling operations performed by the controller 180, or may temporarily store data (e.g., a phonebook, messages, still images, videos, and the like) that has been or will be output. Also, the memory 160 may store data regarding various ways of vibration and audio signals output when a touch is applied to the touch screen.
The memory 160 may include at least one type of storage medium including a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, and the like. Also, the mobile terminal 100 may cooperate with a network storage device that performs a storage function of the memory 160 through a network connection.
The controller 180 generally controls the overall operation of the mobile terminal. For example, the controller 180 performs control and processing related to voice calls, data communications, video calls, and the like. In addition, the controller 180 may include a multimedia module 181 for reproducing (or playing back) multimedia data, and the multimedia module 181 may be constructed within the controller 180 or may be constructed separately from the controller 180. The controller 180 may perform a pattern recognition process to recognize a handwriting input or a picture drawing input performed on the touch screen as a character or an image.
The power supply unit 190 receives external power or internal power and provides appropriate power required to operate various elements and components under the control of the controller 180.
The various embodiments described herein may be implemented in a computer-readable medium using, for example, computer software, hardware, or any combination thereof. For a hardware implementation, the embodiments described herein may be implemented using at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a processor, a controller, a microcontroller, a microprocessor, an electronic unit designed to perform the functions described herein, and in some cases, such embodiments may be implemented in the controller 180. For a software implementation, the implementation such as a process or a function may be implemented with a separate software module that allows performing at least one function or operation. The software codes may be implemented by software applications (or programs) written in any suitable programming language, which may be stored in the memory 160 and executed by the controller 180.
Up to this point, the mobile terminal 100 has been described in terms of its functionality. In addition, the mobile terminal 100 in the embodiment of the present invention may be a mobile terminal such as a folder type, a bar type, a swing type, a slide type, and other various types, and is not limited herein.
Based on the hardware structure of the mobile terminal, the invention provides various embodiments of the method.
As shown in fig. 2, one embodiment of the present invention provides a method for adjusting a Wifi frequency offset, which is applied to a terminal having a Wifi module, and includes the following steps:
201. starting;
202. acquiring a current communication signal frequency value;
203. calculating the difference value between the current communication signal frequency value and the theoretical optimal communication frequency value;
the theoretical optimal communication frequency value is that a communication channel fixed by Wifi corresponds to a fixed frequency according to the protocol communication requirement; the difference value is the value obtained by subtracting the theoretical optimal communication frequency value from the current communication signal frequency value;
204. judging whether the absolute value of the difference value is larger than a preset value, if so, entering a step 205, and if not, entering a step 206;
the above-mentioned preset value is 15 to 25ppm, for example 20 ppm;
205. adjusting the voltage value applied to the tuning capacitor;
the tuning capacitor is a grounding capacitor of a crystal oscillator connected with the Wifi module; more specifically, the resonant frequency provided by the crystal oscillator provides a reference frequency for the Wifi module, and according to a calculation formula of the resonant frequency:
wherein L is inductive reactance, and C isCapacitive reactance; it is known that the resonant frequency provided by the crystal oscillator is determined by the equivalent inductance and the equivalent capacitance. Therefore, when the capacitance of the grounding capacitors at two sides of the crystal oscillator is changed, the equivalent capacitance is changed, so that the resonance frequency can be changed along with the change of the equivalent capacitance; the capacitance characteristic of the tuning capacitor and the control voltage form a certain inverse proportion relation, so that the capacitance of the tuning capacitor can be changed by adjusting the voltage value applied to the tuning capacitor;
206. and (6) ending.
In another embodiment of the present invention, after the voltage value applied to the tuning capacitor is adjusted, the above steps 202 to 205 may be further repeated until the absolute value of the difference is less than or equal to the preset value.
On the basis of the embodiment corresponding to fig. 2, in another optional embodiment of the method for adjusting a Wifi frequency offset, as shown in fig. 3, when obtaining a current communication signal frequency value, the method includes:
301. starting;
302. acquiring the current communication signal;
303. amplifying the current communication signal;
304. carrying out square wave shaping processing on the amplified communication signal;
305. reading the frequency of the communication signal subjected to square wave shaping processing as the frequency value of the current communication signal;
in specific implementation, a counter mode can be adopted to collect the frequency, wherein the counter mode is to count the number of rising edges or falling edges within a certain time;
307. and (6) ending.
In this embodiment, when the terminal communicates with the route, the current communication signal, i.e., the Wifi signal, is first subjected to square wave shaping, and then the frequency is collected in a counter manner, where the counter manner is to count the number of rising edges or falling edges within a certain time.
On the basis of the embodiment corresponding to fig. 2, in another optional embodiment of the method for adjusting a Wifi frequency offset, as shown in fig. 4, the determining whether an absolute value of the difference is greater than a preset value, and if so, adjusting a voltage value applied to a tuning capacitor specifically includes:
401. starting;
402. judging whether the absolute value of the difference value is larger than a preset value, if so, entering a step 403; if not, go to step 406;
403. judging whether the difference value is larger than zero, if so, entering a step 404; if not, go to step 405;
404. reducing the voltage value applied to the tuning capacitor by at least one voltage step value;
405. increasing the value of the voltage applied to the tuning capacitor by at least one voltage step value;
406. and (6) ending.
It should be noted that, if the difference is greater than zero and the absolute value of the difference is greater than the preset value, it indicates that the current communication signal frequency value is greater than the sum of the theoretically optimal communication frequency value and the preset value, and the method is performed according to the resonant frequency formula
The frequency value of the current communication signal can be reduced by increasing the equivalent C value; the capacitance characteristic of the tuning capacitor and the control voltage are in a certain inverse proportion relation, therefore, a voltage step value gamma is set, the voltage value applied to the tuning capacitor is reduced by at least one voltage step value, and the C value is increased by a certain value, so that the current communication signal frequency value is closer to the theoretical optimal communication frequency value.
If the difference is less than zero and the absolute value of the difference is greater than the preset value, it indicates that the current communication signal frequency value is less than the difference between the theoretical optimal communication frequency value and the preset value, and the difference is calculated according to the resonant frequency formula
The frequency value of the current communication signal can be increased by reducing the equivalent C value; the capacitance characteristic of the tuning capacitor is inversely proportional to the control voltage, so that a voltage step value gamma is set and appliedWhen the voltage value of the tuning capacitor is increased by at least one voltage step value, the C value is increased by a certain value, so that the current communication signal frequency value is closer to the theoretical optimal communication frequency value.
On the basis of the embodiment corresponding to fig. 2, in another optional embodiment of the method for adjusting a Wifi frequency offset, as shown in fig. 5, the determining whether an absolute value of the difference is greater than a preset value, and if so, adjusting a voltage value applied to a tuning capacitor specifically includes:
501. starting;
502. judging whether the absolute value of the difference value is larger than a first preset value or not, if so, entering a step 503; if not, go to step 510;
503. judging whether the absolute value of the difference value is smaller than a second preset value, if so, entering a step 504; if not, go to step 507;
wherein the second preset value is greater than the first preset value;
504. judging whether the difference value is larger than zero; if yes, go to step 505; if not, go to step 506;
505. reducing the voltage value applied to the tuning capacitor by a voltage step value;
506. increasing the voltage value applied to the tuning capacitor by a voltage step value;
507. judging whether the difference value is larger than zero; if yes, go to step 508; if not, go to step 509;
508. reducing the voltage value applied to the tuning capacitor by at least two voltage step values;
509. increasing the voltage value applied to the tuning capacitor by at least two voltage step values;
510. and (6) ending.
It can be seen that, in this embodiment, if the difference is greater than zero, and the absolute value of the difference is greater than the first preset value and less than the second preset value, the voltage value is decreased by one voltage step value; if the difference is larger than zero and the absolute value of the difference is larger than or equal to the second preset value, reducing the voltage value by at least two voltage stepping values; if the difference is smaller than zero, and the absolute value of the difference is larger than a first preset value and smaller than a second preset value, increasing a voltage stepping value to the voltage value; and if the difference is smaller than zero and the absolute value of the difference is larger than or equal to the second preset value, increasing the voltage value by at least two voltage stepping values. Therefore, the current communication signal frequency value can be more quickly close to the theoretical optimal communication frequency value.
On the basis of the embodiment corresponding to fig. 4 or fig. 5, in another optional embodiment of the adjusting method for Wifi frequency offset provided in the embodiment of the present invention, the voltage step value is not greater than 0.05V.
It should be noted that, in the above embodiment, since the grounding capacitors of the crystal oscillator are generally two, that is, there are two tuning capacitors, when adjusting the voltage value, only one tuning capacitor may be adjusted at a time, and preferably, the two tuning capacitors are adjusted simultaneously; in addition, the voltage step values corresponding to the two tuning capacitors may be the same or different, which is not limited in the present invention.
The above describes the adjustment method of the Wifi frequency offset in the embodiment of the present invention, and the following describes the terminal in the embodiment of the present invention.
As shown in fig. 6, the present invention provides one embodiment of a terminal, which includes a Wifi module 10, a frequency obtaining unit 20, a microprocessor 30, and a digital-to-analog converter 40.
Wherein, the frequency obtaining unit 20 is configured to obtain a current communication signal frequency value; the microprocessor 30 is configured to calculate a difference between the current communication signal frequency value and the theoretically optimal communication frequency value, and determine whether an absolute value of the difference is greater than a preset value. The theoretical optimal communication frequency value is that a communication channel fixed by Wifi corresponds to a fixed frequency according to the protocol communication requirement; the difference is the current communication signal frequency value minus the theoretical optimum communication frequency value.
The dac 40 is configured to adjust a voltage applied to the tuning capacitor 60 if an absolute value of the difference is greater than a predetermined value, so that the difference is smaller than the predetermined value, where the tuning capacitor 60 is equal to the predetermined valueAnd the grounding capacitance of the crystal oscillator 50 connected with the Wifi module 10. The above-mentioned preset value is 15 to 25ppm, for example 20 ppm. More specifically, the resonant frequency provided by the crystal oscillator provides a reference frequency for the Wifi module, and according to a calculation formula of the resonant frequency:
wherein, L is inductive reactance, C is capacitive reactance; it is known that the resonant frequency provided by the crystal oscillator is determined by the equivalent inductance and the equivalent capacitance. Therefore, when the capacitance of the grounding capacitors at two sides of the crystal oscillator is changed, the equivalent capacitance is changed, so that the resonance frequency can be changed along with the change of the equivalent capacitance; the capacitance characteristic of the tuning capacitor is in a certain inverse proportional relation with the control voltage, so that the capacitance of the tuning capacitor can be changed by adjusting the voltage value applied to the tuning capacitor.
As shown in fig. 7, another embodiment of the terminal according to the present invention includes a Wifi module 10, a frequency obtaining unit 20, a microprocessor 30, and a digital-to-analog converter 40.
Wherein, the frequency obtaining unit 20 is configured to obtain a current communication signal frequency value; in this embodiment, the frequency obtaining unit 20 includes: an obtaining module 21, configured to obtain the current communication signal; the amplifying module 22 is configured to amplify the current communication signal; the shaping module 23 is configured to perform square wave shaping processing on the amplified communication signal; the measuring module 24 is configured to read a frequency of the communication signal subjected to the square wave shaping processing as the current communication signal frequency value; in a specific implementation, the frequency may be collected by using a counter method, where the counter method is to count the number of rising edges or falling edges within a certain time.
In practical implementation, at least one of the obtaining module 21 and the amplifying module 22 may be integrated in the Wifi module 10.
The microprocessor 30 is configured to calculate a difference between the current communication signal frequency value and the theoretically optimal communication frequency value, and determine whether an absolute value of the difference is greater than a preset value. The theoretical optimal communication frequency value is that a communication channel fixed by Wifi corresponds to a fixed frequency according to the protocol communication requirement; the difference is the current communication signal frequency value minus the theoretical optimum communication frequency value.
The digital-to-analog converter 40 is configured to adjust a voltage value applied to a tuning capacitor 60 if an absolute value of the difference is greater than a preset value, where the tuning capacitor 60 is a ground capacitor of a crystal oscillator 50 connected to the Wifi module 10. More specifically, the resonant frequency provided by the crystal oscillator provides a reference frequency for the Wifi module, and the resonant frequency provided by the crystal oscillator is determined by the equivalent inductance and the equivalent capacitance. When the capacitance of the grounding capacitors at two sides of the crystal oscillator is changed, the equivalent capacitance is changed, so that the resonance frequency can be changed along with the change of the equivalent capacitance; the capacitance characteristic of the tuning capacitor is in a certain inverse proportional relation with the control voltage, so that the capacitance of the tuning capacitor can be changed by adjusting the voltage value applied to the tuning capacitor.
The present invention provides another embodiment of a terminal, which includes a Wifi module 10, a frequency obtaining unit 20, a microprocessor 30, and a digital-to-analog converter 40.
Wherein, the frequency obtaining unit 20 is configured to obtain a current communication signal frequency value; in this embodiment, the frequency obtaining unit 20 includes: an obtaining module 21, configured to obtain the current communication signal; the amplifying module 22 is configured to amplify the current communication signal; the shaping module 23 is configured to perform square wave shaping processing on the amplified communication signal; the measuring module 24 is configured to read a frequency of the communication signal subjected to the square wave shaping processing as the current communication signal frequency value; in a specific implementation, the frequency may be collected by using a counter method, where the counter method is to count the number of rising edges or falling edges within a certain time.
The microprocessor 30 is configured to calculate a difference between the current communication signal frequency value and the theoretically optimal communication frequency value, and determine whether an absolute value of the difference is greater than a preset value. The theoretical optimal communication frequency value is that a communication channel fixed by Wifi corresponds to a fixed frequency according to the protocol communication requirement; the difference is the current communication signal frequency value minus the theoretical optimum communication frequency value.
The microprocessor 30 is also configured to: if the difference is larger than zero and the absolute value of the difference is larger than a preset value, controlling the digital-to-analog converter to reduce the voltage value by at least one voltage stepping value; and if the difference is smaller than zero and the absolute value of the difference is larger than a preset value, controlling the digital-to-analog converter to increase the voltage value by at least one voltage stepping value.
It should be noted that, if the difference is greater than zero and the absolute value of the difference is greater than the preset value, it indicates that the current communication signal frequency value is greater than the sum of the theoretically optimal communication frequency value and the preset value, and the method is performed according to the resonant frequency formula
The frequency value of the current communication signal can be reduced by increasing the equivalent C value; the capacitance characteristic of the tuning capacitor and the control voltage are in a certain inverse proportion relation, therefore, a voltage step value gamma is set, the voltage value applied to the tuning capacitor is reduced by at least one voltage step value, and the C value is increased by a certain value, so that the current communication signal frequency value is closer to the theoretical optimal communication frequency value.
If the difference is less than zero and the absolute value of the difference is greater than the preset value, it indicates that the current communication signal frequency value is less than the difference between the theoretical optimal communication frequency value and the preset value, and the difference is calculated according to the resonant frequency formula
The frequency value of the current communication signal can be increased by reducing the equivalent C value; the capacitance characteristic of the tuning capacitor and the control voltage are in a certain inverse proportion relation, therefore, a voltage step value gamma is set, the voltage value applied to the tuning capacitor is increased by at least one voltage step value, and the C value is increased by a certain value, so that the current communication signal frequency value is closer to the theoretical optimal communication frequency value. In this embodiment, one voltage step is not greater than 0.05V.
The digital-to-analog converter 40 is configured to adjust a voltage value applied to the tuning capacitor 60 if the absolute value of the difference is greater than a preset value, so that the difference is smaller than the preset value, where the tuning capacitor 60 is a ground capacitor of the crystal oscillator 50 connected to the Wifi module 10. More specifically, the resonant frequency provided by the crystal oscillator provides a reference frequency for the Wifi module, and the resonant frequency provided by the crystal oscillator is determined by the equivalent inductance and the equivalent capacitance. When the capacitance of the grounding capacitors at two sides of the crystal oscillator is changed, the equivalent capacitance is changed, so that the resonance frequency can be changed along with the change of the equivalent capacitance; the capacitance characteristic of the tuning capacitor is in a certain inverse proportional relation with the control voltage, so that the capacitance of the tuning capacitor can be changed by adjusting the voltage value applied to the tuning capacitor.
The present invention provides another embodiment of a terminal, which includes a Wifi module 10, a frequency obtaining unit 20, a microprocessor 30, and a digital-to-analog converter 40.
Wherein, the frequency obtaining unit 20 is configured to obtain a current communication signal frequency value; in this embodiment, the frequency obtaining unit 20 includes: an obtaining module 21, configured to obtain the current communication signal; the amplifying module 22 is configured to amplify the current communication signal; the shaping module 23 is configured to perform square wave shaping processing on the amplified communication signal; the measuring module 24 is configured to read a frequency of the communication signal subjected to the square wave shaping processing as the current communication signal frequency value; in a specific implementation, the frequency may be collected by using a counter method, where the counter method is to count the number of rising edges or falling edges within a certain time.
The microprocessor 30 is configured to calculate a difference between the current communication signal frequency value and the theoretically optimal communication frequency value, and determine whether an absolute value of the difference is greater than a preset value. The theoretical optimal communication frequency value is that a communication channel fixed by Wifi corresponds to a fixed frequency according to the protocol communication requirement; the difference is the current communication signal frequency value minus the theoretical optimum communication frequency value.
The microprocessor 30 is also configured to: if the difference is larger than zero, and the absolute value of the difference is larger than a first preset value and smaller than a second preset value, controlling the digital-to-analog converter to reduce the voltage value by a voltage stepping value; if the difference is larger than zero and the absolute value of the difference is larger than or equal to the second preset value, controlling the digital-to-analog converter to reduce the voltage value by at least two voltage stepping values; if the difference is smaller than zero, and the absolute value of the difference is larger than a first preset value and smaller than a second preset value, controlling the digital-to-analog converter to increase the voltage value by a voltage stepping value; and if the difference is smaller than zero and the absolute value of the difference is larger than or equal to the second preset value, controlling the digital-to-analog converter to increase the voltage value by at least two voltage stepping values. Therefore, the current communication signal frequency value can be more quickly close to the theoretical optimal communication frequency value. In this embodiment, one voltage step is not greater than 0.05V.
The digital-to-analog converter 40 is configured to adjust a voltage value applied to the tuning capacitor 60 if the absolute value of the difference is greater than a preset value, so that the difference is smaller than the preset value, where the tuning capacitor 60 is a ground capacitor of the crystal oscillator 50 connected to the Wifi module 10. More specifically, the resonant frequency provided by the crystal oscillator provides a reference frequency for the Wifi module, and the resonant frequency provided by the crystal oscillator is determined by the equivalent inductance and the equivalent capacitance. When the capacitance of the grounding capacitors at two sides of the crystal oscillator is changed, the equivalent capacitance is changed, so that the resonance frequency can be changed along with the change of the equivalent capacitance; the capacitance characteristic of the tuning capacitor is in a certain inverse proportional relation with the control voltage, so that the capacitance of the tuning capacitor can be changed by adjusting the voltage value applied to the tuning capacitor.
It should be noted that, in the terminal in the above embodiment, since the grounding capacitance of the crystal oscillator is generally two, that is, there are two tuning capacitances, when adjusting the voltage value, only one tuning capacitance can be adjusted at a time, and preferably, the two tuning capacitances are adjusted simultaneously; in addition, the voltage step values corresponding to the two tuning capacitors may be the same or different, which is not limited in the present invention.
According to the adjusting method and the terminal for the Wifi frequency offset, the communication signal is taken out from the Wifi module, amplified, subjected to square wave shaping and read out of the frequency of the communication signal and sent to the processor; the processor reads the actual current communication signal frequency value of the Wifi module and then compares the actual current communication signal frequency value with the theoretical optimal communication frequency value, when the difference value between the actual current communication signal frequency value and the theoretical optimal communication frequency value exceeds a certain threshold value, the digital-to-analog converter DAC is started to adjust the tuning capacitor, the absolute value of the difference value between the actual current communication signal frequency value and the theoretical optimal communication frequency value is kept within the preset value, the Wifi communication stability is guaranteed, the problem of abnormal signal interruption caused by Wifi frequency deviation can be effectively avoided, and.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for adjusting Wifi frequency offset is applied to a terminal with a Wifi module, and is characterized by comprising the following steps:
when the terminal communicates with the router, the current communication signal frequency value is obtained;
calculating the difference value between the current communication signal frequency value and the theoretical optimal communication frequency value; the theoretical optimal communication frequency value is a fixed frequency corresponding to a wifi fixed communication channel according to protocol communication requirements;
and if the absolute value of the difference is larger than a preset value, adjusting the voltage value applied to a tuning capacitor so that the difference is smaller than the preset value, wherein the tuning capacitor is the grounding capacitor of a crystal oscillator connected with the Wifi module.
2. The method for adjusting Wifi frequency offset according to claim 1, wherein said obtaining the current communication signal frequency value includes:
acquiring the current communication signal;
amplifying the current communication signal;
carrying out square wave shaping processing on the amplified communication signal;
and reading the frequency of the communication signal subjected to the square wave shaping processing as the current communication signal frequency value.
3. The method of adjusting Wifi frequency offset according to claim 1, wherein if the absolute value of the difference is larger than a preset value, the adjusting the voltage value applied to the tuning capacitor includes:
if the difference value is larger than zero and the absolute value of the difference value is larger than a preset value, reducing the voltage value by at least one voltage stepping value;
and if the difference is smaller than zero and the absolute value of the difference is larger than a preset value, increasing the voltage value by at least one voltage stepping value.
4. The method for adjusting Wifi frequency offset according to claim 1, wherein if the absolute value of the difference is greater than a preset value, the adjusting the voltage value applied to the tuning capacitor includes:
if the difference value is larger than zero, and the absolute value of the difference value is larger than a first preset value and smaller than a second preset value, reducing the voltage value by a voltage stepping value;
if the difference is larger than zero and the absolute value of the difference is larger than or equal to the second preset value, reducing the voltage value by at least two voltage stepping values;
if the difference is smaller than zero, and the absolute value of the difference is larger than a first preset value and smaller than a second preset value, increasing a voltage stepping value to the voltage value;
and if the difference is smaller than zero and the absolute value of the difference is larger than or equal to the second preset value, increasing the voltage value by at least two voltage stepping values.
5. The method for adjusting Wifi frequency offset according to claim 3 or 4, wherein the voltage step value is not greater than 0.05V.
6. The utility model provides a terminal, includes the Wifi module, its characterized in that includes:
the frequency acquisition unit is used for acquiring the frequency value of the current communication signal when the terminal communicates with the route;
the microprocessor is used for calculating the difference value between the current communication signal frequency value and the theoretical optimal communication frequency value and judging whether the absolute value of the difference value is greater than a preset value or not; the theoretical optimal communication frequency value is a fixed frequency corresponding to a wifi fixed communication channel according to protocol communication requirements;
and the digital-to-analog converter is used for adjusting the voltage value applied to the tuning capacitor if the absolute value of the difference is greater than a preset value so as to enable the difference to be smaller than the preset value, wherein the tuning capacitor is the grounding capacitor of the crystal oscillator connected with the Wifi module.
7. The terminal of claim 6, wherein the frequency obtaining unit comprises:
an obtaining module, configured to obtain the current communication signal;
the amplifying module is used for amplifying the current communication signal;
the shaping module is used for carrying out square wave shaping processing on the amplified communication signal;
and the measuring module is used for reading the frequency of the communication signal subjected to the square wave shaping processing as the frequency value of the current communication signal.
8. The terminal of claim 6, wherein the microprocessor is configured to:
if the difference is larger than zero and the absolute value of the difference is larger than a preset value, controlling the digital-to-analog converter to reduce the voltage value by at least one voltage stepping value;
and if the difference is smaller than zero and the absolute value of the difference is larger than a preset value, controlling the digital-to-analog converter to increase the voltage value by at least one voltage stepping value.
9. The terminal of claim 6, wherein the microprocessor is configured to:
if the difference is larger than zero, and the absolute value of the difference is larger than a first preset value and smaller than a second preset value, controlling the digital-to-analog converter to reduce the voltage value by a voltage stepping value;
if the difference is larger than zero and the absolute value of the difference is larger than or equal to the second preset value, controlling the digital-to-analog converter to reduce the voltage value by at least two voltage stepping values;
if the difference is smaller than zero, and the absolute value of the difference is larger than a first preset value and smaller than a second preset value, controlling the digital-to-analog converter to increase the voltage value by a voltage stepping value;
and if the difference is smaller than zero and the absolute value of the difference is larger than or equal to the second preset value, controlling the digital-to-analog converter to increase the voltage value by at least two voltage stepping values.
10. A terminal as claimed in claim 8 or 9, characterised in that the voltage step value is no more than 0.05V.
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| CN103166674A (en) * | 2011-12-14 | 2013-06-19 | 无锡国科微纳传感网科技有限公司 | Signal frequency correction method and signal frequency correction device |
| CN104683039A (en) * | 2013-11-28 | 2015-06-03 | 展讯通信（上海）有限公司 | Crystal oscillator frequency calibration method and calibration device for communication terminal |
| CN104683040A (en) * | 2013-11-29 | 2015-06-03 | 展讯通信（上海）有限公司 | Calibration method and calibration device for frequency synthesizer in communication terminal |
| CN106160761A (en) * | 2015-03-31 | 2016-11-23 | 联想(北京)有限公司 | A kind of transmitting frequency calibration method and electronic equipment |
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| CN103166674A (en) * | 2011-12-14 | 2013-06-19 | 无锡国科微纳传感网科技有限公司 | Signal frequency correction method and signal frequency correction device |
| CN104683039A (en) * | 2013-11-28 | 2015-06-03 | 展讯通信（上海）有限公司 | Crystal oscillator frequency calibration method and calibration device for communication terminal |
| CN104683040A (en) * | 2013-11-29 | 2015-06-03 | 展讯通信（上海）有限公司 | Calibration method and calibration device for frequency synthesizer in communication terminal |
| CN106160761A (en) * | 2015-03-31 | 2016-11-23 | 联想(北京)有限公司 | A kind of transmitting frequency calibration method and electronic equipment |
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