CN109039574B - Method for reducing frequency deviation and terminal equipment thereof - Google Patents
Method for reducing frequency deviation and terminal equipment thereof Download PDFInfo
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- CN109039574B CN109039574B CN201810953259.6A CN201810953259A CN109039574B CN 109039574 B CN109039574 B CN 109039574B CN 201810953259 A CN201810953259 A CN 201810953259A CN 109039574 B CN109039574 B CN 109039574B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
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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
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
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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
Abstract
The invention discloses a method and a device for reducing frequency deviation and terminal equipment thereof, which are used for solving the problem that the method for reducing frequency deviation in the prior art is not optimized. The method comprises the following steps: demodulating a signal source of a current time point of terminal equipment, wherein the frequency stability of the signal source is less than or equal to a preset threshold value; determining the frequency offset of the current time point of the terminal equipment based on the demodulated signal source; if the frequency offset of the current time point of the terminal equipment is not in a preset range, adjusting the frequency of a clock source of the terminal equipment based on the frequency offset of the current time point of the terminal equipment and compensation parameters corresponding to the temperature on the basis of the frequency offset of the current time point of the terminal equipment and the frequency offset of the current time point of the terminal equipment; and the temperature, the frequency offset and the compensation parameter of the terminal equipment form a mapping relation.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method for reducing frequency offset and a terminal device thereof.
Background
The frequency offset of the terminal device relative to the network side device often includes the following two parts: part is carrier frequency offset caused by the fact that the terminal equipment and the network side equipment use clock sources with different precision; the other part is due to the frequency offset caused by doppler.
The frequency offset causes the signal-to-noise ratio of wireless signal search to be deteriorated, the probability of successful cell search is reduced, and if the frequency offset is more serious, normal conversation between terminal devices may not be realized. In order to solve this problem, in the prior art, a plurality of test calibration links are performed during the production process of the terminal device, so as to ensure that the terminal device can be in an optimal state, and meet the requirements of various communication protocols and other aspects.
However, because the service cycle of the terminal device is long, drift and jitter of a Crystal Oscillator (XO) or a Voltage-Controlled Crystal Oscillator (VCXO) may aggravate the frequency offset degradation, the terminal device may only rely on synchronization with a network-side device to control frequency stability after leaving the factory, and the network-side device has limited control accuracy, and may only perform compensation within a small range, and may not perform compensation if exceeding a certain frequency offset. Therefore, how to reduce the frequency offset between the terminal device and the network side device still needs to be further solved.
Disclosure of Invention
The embodiment of the invention provides a method and a device for reducing frequency offset and a terminal device thereof, and aims to solve the problem that the method for reducing the frequency offset of the terminal device and a network side device in the prior art is not optimized.
In order to solve the technical problem, the invention is realized as follows: in a first aspect, an embodiment of the present invention provides a method for reducing frequency offset, including:
demodulating a signal source of a current time point of terminal equipment, wherein the frequency stability of the signal source is less than or equal to a preset threshold value;
determining the frequency offset of the current time point of the terminal equipment based on the demodulated signal source;
if the frequency offset of the current time point of the terminal equipment is not in a preset range, adjusting the frequency of a clock source of the terminal equipment based on the frequency offset of the current time point of the terminal equipment and compensation parameters corresponding to the temperature;
and the temperature, the frequency offset and the compensation parameter of the terminal equipment form a mapping relation.
In a second aspect, an embodiment of the present invention provides an apparatus for reducing frequency offset, including:
the demodulation unit is used for demodulating a signal source of the current time point of the terminal equipment, and the frequency stability of the signal source is less than or equal to a preset threshold value;
a determining unit, configured to determine, based on the demodulated signal source, a frequency offset of the terminal device at a current time point;
the adjusting unit is used for adjusting the frequency of a clock source of the terminal device based on the frequency offset of the current time point of the terminal device and a compensation parameter corresponding to the temperature if the frequency offset of the current time point of the terminal device is not within a preset range;
and the temperature, the frequency offset and the compensation parameter of the terminal equipment form a mapping relation.
In a third aspect, an embodiment of the present invention provides a terminal device, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method as in the first aspect.
In a fourth aspect, the embodiments of the present invention also provide a readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method according to the first aspect.
In the embodiment of the invention, a signal source of the current time point of the terminal equipment can be demodulated firstly, then the frequency offset of the current time point of the terminal equipment is determined based on the demodulated signal source, and when the frequency offset of the current time point of the terminal equipment is not in a preset range, the frequency of a clock source of the terminal equipment is adjusted based on the frequency offset of the current time point of the terminal equipment and compensation parameters corresponding to the temperature, so that the frequency offset of the current time point of the terminal equipment is reduced. Because the frequency stability of the signal source is less than or equal to the preset threshold, compared with a general signal source, the precision and the stability of the signal source are higher, the accuracy and the stability of the frequency deviation determined based on the demodulated signal source are also higher, and the temperature, the frequency deviation and the compensation parameters of the terminal device form a mapping relation, so that the frequency deviation of the terminal device can be accurately reduced based on the frequency deviation of the current time point of the terminal device and the clock source frequency adjusted by the compensation parameters corresponding to the temperature.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a flowchart illustrating an embodiment of a method for reducing frequency offset according to an embodiment of the present invention;
fig. 2 is a graph showing a correspondence relationship between a frequency offset and a temperature of an XO clock source of a terminal device;
FIG. 3 is a comparison between a prior art terminal device before and after frequency calibration;
fig. 4 is a schematic diagram of an internal structure of an XO clock source in an embodiment of the present invention;
fig. 5 is a schematic diagram of an XO clock source in a terminal device;
fig. 6 is a schematic diagram of a preset mapping table according to an embodiment of the present invention;
fig. 7 is a schematic flowchart of a method for reducing frequency offset according to an embodiment of the present invention applied in an actual scenario;
fig. 8 is a schematic structural diagram of an apparatus for reducing frequency offset according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
In order to solve the problem that the method for reducing frequency offset in the prior art is not optimized, the present invention provides a method for reducing frequency offset, and an execution subject of the method, such as but not limited to a server, can be configured to execute at least one of the user terminals of the method provided by the embodiments of the present invention.
For convenience of description, the following description will be made of an embodiment of the method taking as an example that an execution subject of the method is a terminal device capable of executing the method. It is understood that the implementation of the method by the terminal device is only an exemplary illustration, and should not be construed as a limitation of the method.
Specifically, the method for reducing frequency offset provided by the invention comprises the following steps: firstly, demodulating a signal source of a current time point of terminal equipment, wherein the frequency stability of the signal source is less than or equal to a preset threshold value; then, based on the demodulated signal source, determining the frequency offset of the current time point of the terminal equipment; finally, if the frequency offset of the current time point of the terminal equipment is not in the preset range, adjusting the frequency of a clock source of the terminal equipment based on the frequency offset of the current time point of the terminal equipment and compensation parameters corresponding to the temperature; the temperature, the frequency offset and the compensation parameter of the terminal equipment form a mapping relation.
In the embodiment of the invention, a signal source of the current time point of the terminal equipment can be demodulated firstly, then the frequency offset of the current time point of the terminal equipment is determined based on the demodulated signal source, and when the frequency offset of the current time point of the terminal equipment is not in a preset range, the frequency of a clock source of the terminal equipment is adjusted based on the frequency offset of the current time point of the terminal equipment and compensation parameters corresponding to the temperature, so that the frequency offset of the current time point of the terminal equipment is reduced. Because the frequency stability of the signal source is less than or equal to the preset threshold, compared with a general signal source, the precision and the stability of the signal source are higher, the accuracy and the stability of the frequency deviation determined based on the demodulated signal source are also higher, and the temperature, the frequency deviation and the compensation parameters of the terminal device form a mapping relation, so that the frequency deviation of the terminal device can be accurately reduced based on the frequency deviation of the current time point of the terminal device and the clock source frequency adjusted by the compensation parameters corresponding to the temperature.
The following describes in detail an implementation process of the method with reference to a flowchart of a specific implementation of the method for reducing frequency offset shown in fig. 1, where the implementation process includes:
the preset threshold is used for screening out a signal source with high frequency stability, the preset threshold can be obtained through multiple experiments, the preset threshold can be smaller than or equal to 2ppm in practical application, and taking the preset threshold as 2ppm as an example, the frequency of the signal source fluctuates within a range of +/-2 ppm on the basis of the original frequency. The signal source with the frequency stability less than or equal to the preset threshold includes a Global Positioning System (GPS) signal, WiFi or other wireless signals.
As described in the background art, in an existing wireless mobile communication system, a base station on a network side uses a high-stability temperature compensated Crystal Oscillator as an operating clock source, and the frequency stability of the high-stability temperature compensated Crystal Oscillator generally reaches 0.05 parts per million (ppm), while a terminal device uses a Crystal Oscillator (XO) or a Voltage-Controlled Crystal Oscillator (VCXO), and the frequency stability of the terminal device is generally only about 10ppm and is calibrated within 5ppm before the terminal device leaves a factory. This causes a Frequency Offset (Frequency Offset), generally referred to as Frequency Offset, to be generated in the terminal device when receiving the downlink signal transmitted from the base station side device. In addition to the frequency offset generated in this case, the terminal apparatus also generates doppler frequency offset in the case of high-speed movement.
In the prior art, after the terminal device and the network side device establish synchronization, the downlink reference signal of the network side device may be used to perform frequency locking, so that the frequency offset of the terminal device can be controlled within 0.1 ppm. However, when the wireless channel environment is relatively bad, the terminal device needs to perform a long-time initial cell search to obtain a higher signal-to-noise ratio, but the long-time cell search will aggravate the influence of the phase error accumulated by the frequency offset, and conversely, will decrease the actually received signal-to-noise ratio, and at the same time, as the service cycle of the terminal device becomes longer, the drift and jitter of the XO or VCXO will also aggravate the deterioration of the frequency offset, and in a severe case, the cell search of the terminal device will also fail.
For convenience of description, the following description takes the clock source of the terminal device as an XO clock source as an example, and it should be understood that the clock source of the terminal device is an XO clock source only for exemplary illustration and should not be construed as a limitation to the method provided by the embodiment of the present invention. The frequency adjusting method of the VCXO clock source and the XO clock source is similar, and the embodiment of the present invention is not repeated for the case that the clock source of the terminal device is the VCXO clock source.
In order to reduce the frequency offset of the terminal device, the prior art generally adopts the following two ways to reduce the frequency offset: in the first mode, the network side equipment is used for frequency calibration, however, the frequency calibration can be performed only when the frequency offset is within a certain range, that is, the required signal-to-noise ratio can be synchronized with the network side equipment within a certain range, and when the frequency offset is deteriorated to be unable to be synchronized with the network side, or the frequency calibration cannot be performed on the terminal equipment under weak signals to reduce the frequency offset; in the second mode, the frequency offset is reduced by a radio frequency calibration method, and this mode needs to return the terminal equipment to a factory and disassemble the terminal equipment, and needs to use professional equipment to perform frequency calibration, so that the process is complicated and the user experience is affected.
As shown in fig. 2, it is a graph of the correspondence relationship between the frequency offset and the temperature of the XO clock source of the terminal device, in fig. 2, a curve labeled "T" is a graph of the correspondence relationship between the frequency offset and the temperature of the XO clock source of a typical terminal device, a curve labeled "a" is a graph of the correspondence relationship between the frequency offset and the temperature of the XO clock source of the terminal device measured actually, and each curve corresponds to a setting of the clock source frequency of the XO. Obviously, the frequency offset of the terminal device changes in different temperature ranges and in different ranges of the frequency of the XO clock source. More specifically, the formula f (t) ═ c3(t-t0)3+c2(t-t0)2+ c1(t-t0) + c0 to determine the frequency offset of the XO clock source, where f (t) represents the XO clock source frequency offset, t represents temperature, t0 represents a reference temperature value, and c0, c1, c2, c3 are intrinsic parameters of the XO clock source.
In order to improve the frequency stability of the terminal device, i.e. reduce the frequency offset of the terminal device, in the prior art, the terminal device is calibrated before leaving the factory. Fig. 3 is a comparison diagram of the terminal device before and after frequency calibration in the prior art, where fig. 3(a) is a schematic diagram of changes of frequency offset of the terminal device in different temperature ranges before frequency calibration of the terminal device, and fig. 3(b) is a schematic diagram of changes of frequency offset of the terminal device in different temperature ranges after frequency calibration of the terminal device. As can be seen from fig. 3(a), before the frequency of the terminal device is calibrated, there is a certain difference between the actually measured frequency offset (i.e. the curve labeled "M") and the target frequency offset (i.e. the curve labeled "G"), and after the calibration, as shown in fig. 3(b), the difference between the actually measured frequency offset and the target frequency offset is very small.
In order to optimize the method for reducing the frequency offset in the prior art, the embodiment of the invention introduces a method for demodulating a signal source with frequency stability less than or equal to a preset threshold, and determines the frequency offset of the terminal equipment at the current time point based on the demodulated signal source. In addition, because the signal source with the demodulation frequency stability less than or equal to the preset threshold can be realized for the terminal device, and the user does not need to know the specific process, the process of reducing the frequency offset based on the demodulated signal source does not affect the normal use of the user.
102, determining the frequency offset of the current time point of the terminal equipment based on the demodulated signal source;
optionally, the frequency offset of the current time point of the terminal device is determined based on the demodulated signal source, and first, the frequency corresponding to the signal source is determined based on the demodulated signal source; and then, determining the frequency offset of the current time point of the terminal equipment based on the difference between the frequency corresponding to the signal source and the clock source frequency of the terminal equipment. The clock source frequency of the terminal device can be directly obtained from the terminal device.
As shown in fig. 4, which is a schematic diagram of an internal structure of an XO clock source according to an embodiment of the present invention, the XO clock source mainly includes four capacitors C and a register SBI control for controlling frequency stability of the four capacitors. Adjusting the frequency of the clock source of the terminal device, described below, is actually achieved by adjusting the capacitance shown in fig. 4.
As shown in fig. 5, which is a schematic diagram of an XO clock source in a terminal device, in fig. 5, three reference clock sources are derived from the XO clock source: RF CLK1 (reference clock source of radio frequency modem), RF CLK2 (reference clock source of GPS/WiFi antenna), and BB CLK (reference clock source of baseband unit). Since the reference clock sources RF CLK1 and RF CLK2 are both derived from the XO clock source, the frequency stability, i.e., the frequency offset, of the reference clock sources RF CLK1 and RF CLK2 is proportional to the frequency offset of the terminal device's clock source XO at the same temperature. Based on this point, the embodiment of the present invention obtains a frequency corresponding to a signal source (such as a GPS signal or a WiFi signal) whose frequency stability at the current time point of the terminal device is less than or equal to a preset threshold by demodulating the signal source, and then determines the frequency offset at the current time point of the terminal device based on the frequency of the clock source XO at the current time point of the terminal device and the frequency corresponding to the signal source obtained by demodulation.
And 103, if the frequency offset of the current time point of the terminal device is not within the preset range, adjusting the frequency of a clock source of the terminal device based on the frequency offset of the current time point of the terminal device and the compensation parameter corresponding to the temperature.
The temperature, the frequency offset and the compensation parameter of the terminal equipment form a mapping relation. Fig. 6 is a mapping relationship diagram of temperature, frequency offset, and clock source compensation parameters of a terminal device, which are obtained in advance in the embodiment of the present invention. In fig. 6, the abscissa is the temperature variation range of the XO clock source, the ordinate is the frequency offset variation range of the XO clock source, and each curve in fig. 6 corresponds to a setting of a clock source compensation parameter.
Optionally, if the frequency offset of the current time point of the terminal device is not within the preset range, adjusting the frequency of a clock source of the terminal device based on the frequency offset of the current time point of the terminal device and a compensation parameter corresponding to the temperature, and first obtaining the temperature of the current time point of the terminal device; then, obtaining compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment; and finally, adjusting the frequency of a clock source of the terminal equipment based on the compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment.
Taking the temperature of the current time point of the terminal device as an example of 10 ℃, assuming that the frequency offset of the current time point of the terminal device is not within the preset range, the temperature of the current time point of the terminal device is firstly obtained, the temperature value can be obtained through a temperature sensor built in the terminal device, then a curve corresponding to the frequency offset and the temperature of the current time point of the terminal device is obtained from a mapping relation chart shown in fig. 6, a compensation parameter of a clock source corresponding to the curve is obtained, and finally the obtained compensation parameter of the clock source is written into a register shown in fig. 3, so that the purpose of adjusting the frequency of the clock source of the terminal device can be achieved.
Optionally, as shown in fig. 5, since the frequency stability, that is, the frequency offset, of the reference clock source RF CLK2 of the GPS/WiFi is proportional to the frequency offset of the XO clock source of the terminal device, the frequency of the clock source of the terminal device is adjusted based on the internal parameters of the clock source corresponding to the frequency offset and the temperature at the current time point of the terminal device, specifically, if the frequency offset at the current time point of the terminal device is a positive number (that is, the frequency corresponding to the signal source is less than the frequency of the clock source of the terminal device), the frequency of the clock source of the terminal device is increased based on the compensation parameters corresponding to the frequency offset and the temperature at the current time point of the terminal device; and if the frequency offset of the current time point of the terminal equipment is a negative number (namely the frequency corresponding to the signal source is less than the clock source frequency of the terminal equipment), reducing the frequency of the clock source of the terminal equipment based on the compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment.
Optionally, in order to avoid that the frequency offset of the clock source of the terminal device is still not within the preset range after the frequency of the clock source of the terminal device is adjusted, in the above-described embodiment of the present invention, if the frequency offset of the current time point of the terminal device is not within the preset range, based on the frequency offset of the current time point of the terminal device and the compensation parameter corresponding to the temperature, after the frequency of the clock source of the terminal device is adjusted, the following steps are continuously performed: firstly, demodulating a signal source after the terminal equipment adjusts the frequency of a clock source; then, based on the demodulated signal source, determining the frequency offset of the terminal equipment after the frequency of the clock source is adjusted; and finally, if the frequency offset of the terminal equipment after the clock source frequency is adjusted is not in the preset range, adjusting the clock source frequency of the terminal equipment based on the frequency offset of the terminal equipment after the clock source frequency is adjusted and the compensation parameter corresponding to the temperature. And repeating the above steps until the frequency offset determined based on the demodulated signal source is within the preset range, and then not performing the step of adjusting the clock source frequency of the terminal device.
The following describes the method for reducing the frequency offset according to the embodiment of the present invention in detail, taking the signal source with the frequency stability less than or equal to the preset threshold as the GPS and the clock source type as the XO clock source as an example. As shown in fig. 7, a flow chart of the method for reducing frequency offset according to the embodiment of the present invention applied in an actual scenario includes the following main steps:
701, setting internal parameters of an XO clock source of the terminal equipment based on a preset mapping relation table;
the preset mapping relation table is a mapping relation table among the temperature, the frequency offset and the compensation parameters of the terminal equipment. Specifically, the temperature of the current time point of the terminal device and the requirement of the frequency offset, for example, the fluctuation of the frequency offset in a certain temperature variation range is small, so as to select the internal parameters of the corresponding XO clock source for the terminal device, and write the compensation parameters of the XO clock source into the register for controlling the frequency stability of the XO clock source.
specifically, the frequency corresponding to the GPS signal may be determined by demodulating the GPS signal at the current time point.
the frequency offset of the RF CLK2 is determined based on the frequency corresponding to the GPS signal acquired in step 702 and the frequency of the reference clock source RF CLK2 derived from the XO clock source at the current time point, and it is determined whether the frequency offset of the RF CLK2 is within a preset range. If the frequency offset of the RF CLK2 is within the preset range, it indicates that the frequency offset of the XO clock source of the terminal device is also within the preset range, and therefore, it is not necessary to adjust the frequency of the XO clock source. If the frequency offset of RF CLK2 is not within the predetermined range, then the frequency of the XO clock source may be adjusted by performing step 704 to adjust the compensation parameters of the XO clock source.
specifically, the temperature of the current time point of the terminal device may be obtained, the compensation parameters of the XO clock source corresponding to the temperature and the frequency offset are determined based on the temperature, the frequency offset determined in step 703 and the preset mapping relationship table, and the internal parameters of the XO clock source are adjusted based on the determined compensation parameters of the XO clock source corresponding to the temperature and the frequency offset, so as to achieve the purpose of adjusting the frequency of the XO clock source.
Step 705, after adjusting the internal parameters of the XO clock source, demodulating the GPS signal and detecting whether the frequency offset of the RF CLK2 is within a preset range;
after adjusting the internal parameters of the XO clock source, the GPS signal is continuously demodulated to detect whether the RF CLK2 frequency offset is within a predetermined range, if the RF CLK2 frequency offset is within the predetermined range, step 706 is performed, and if the RF CLK2 frequency offset is not within the predetermined range, step 703 is continuously performed until the RF CLK2 frequency offset obtained based on the demodulated GPS signal is within the predetermined range.
Specifically, the internal parameter information of the XO clock source corresponding to the condition that the frequency offset of the RF CLK2 obtained based on the demodulated GPS signal is within the preset range, which is determined in the above step, may be first obtained, and then the finally determined internal parameter information of the XO clock source may be written into the register.
In the embodiment of the invention, a signal source of the current time point of the terminal equipment can be demodulated firstly, then the frequency offset of the current time point of the terminal equipment is determined based on the demodulated signal source, and when the frequency offset of the current time point of the terminal equipment is not in a preset range, the frequency of a clock source of the terminal equipment is adjusted based on the frequency offset of the current time point of the terminal equipment and compensation parameters corresponding to the temperature, so that the frequency offset of the current time point of the terminal equipment is reduced. Because the frequency stability of the signal source is less than or equal to the preset threshold, compared with a general signal source, the precision and the stability of the signal source are higher, the accuracy and the stability of the frequency deviation determined based on the demodulated signal source are also higher, and the temperature, the frequency deviation and the compensation parameters of the terminal device form a mapping relation, so that the frequency deviation of the terminal device can be accurately reduced based on the frequency deviation of the current time point of the terminal device and the clock source frequency adjusted by the compensation parameters corresponding to the temperature.
Referring to fig. 8, a schematic structural diagram of an apparatus 800 for reducing frequency offset according to an embodiment of the present invention is shown in fig. 8, which includes a demodulation unit 801, a determination unit 802, and an adjustment unit 803, where:
a demodulation unit 801, configured to demodulate a signal source at a current time point of a terminal device, where a frequency stability of the signal source is less than or equal to a preset threshold;
a determining unit 802, configured to determine, based on the demodulated signal source, a frequency offset of the current time point of the terminal device;
an adjusting unit 803, configured to adjust a clock source frequency of the terminal device based on the frequency offset of the current time point of the terminal device and a compensation parameter corresponding to the temperature if the frequency offset of the current time point of the terminal device is not within a preset range;
and the temperature, the frequency offset and the compensation parameter of the terminal equipment form a mapping relation.
Optionally, in an embodiment, the determining unit 802 is configured to:
determining a frequency corresponding to the signal source based on the demodulated signal source;
and determining the frequency offset of the current time point of the terminal equipment based on the difference between the frequency corresponding to the signal source and the clock source frequency of the terminal equipment.
Optionally, in an embodiment, the adjusting unit 803 is configured to:
acquiring the temperature of the current time point of the terminal equipment;
acquiring compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment;
and adjusting the clock source frequency of the terminal equipment based on the compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment.
Optionally, in an embodiment, the adjusting unit 803 is configured to:
if the frequency offset of the current time point of the terminal equipment is a positive number, increasing the frequency of a clock source of the terminal equipment based on compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment;
and if the frequency offset of the current time point of the terminal equipment is a negative number, reducing the frequency of a clock source of the terminal equipment based on compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment.
Optionally, in an implementation manner, the terminal device further includes:
a first demodulation unit 804, configured to demodulate the signal source after the terminal device adjusts the frequency of the clock source;
a first determining unit 805, configured to determine, based on the demodulated signal source, a frequency offset after the terminal device adjusts a clock source frequency;
a first adjusting unit 806, configured to, if the frequency offset obtained after the terminal device adjusts the clock source frequency is not within a preset range, adjust the clock source frequency of the terminal device based on the frequency offset of the current time point of the terminal device and a compensation parameter corresponding to the temperature.
The apparatus 800 for reducing frequency offset according to the embodiment of the present invention can implement each process implemented by the terminal device in the method embodiments of fig. 1 to fig. 7, and for avoiding repetition, details are not described here again.
Figure 9 is a schematic diagram of a hardware configuration of a terminal device 900 for implementing various embodiments of the present invention,
the terminal device 900 includes but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909, a processor 910, and a power supply 911. Those skilled in the art will appreciate that the terminal device configuration shown in fig. 9 does not constitute a limitation of the terminal device, and that the terminal device may include more or fewer components than shown, or combine certain components, or a different arrangement of components. In the embodiment of the present invention, the terminal device includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.
The processor 910 is configured to demodulate a signal source at a current time point of a terminal device, where a frequency stability of the signal source is less than or equal to a preset threshold; determining the frequency offset of the current time point of the terminal equipment based on the demodulated signal source; if the frequency offset of the current time point of the terminal equipment is not in a preset range, adjusting the frequency of a clock source of the terminal equipment based on the frequency offset of the current time point of the terminal equipment and compensation parameters corresponding to the temperature; and the temperature, the frequency offset and the compensation parameter of the terminal equipment form a mapping relation.
In the embodiment of the invention, a signal source of the current time point of the terminal equipment can be demodulated firstly, then the frequency offset of the current time point of the terminal equipment is determined based on the demodulated signal source, and when the frequency offset of the current time point of the terminal equipment is not in a preset range, the frequency of a clock source of the terminal equipment is adjusted based on the frequency offset of the current time point of the terminal equipment and compensation parameters corresponding to the temperature, so that the frequency offset of the current time point of the terminal equipment is reduced. Because the frequency stability of the signal source is less than or equal to the preset threshold, compared with a general signal source, the precision and the stability of the signal source are higher, the accuracy and the stability of the frequency deviation determined based on the demodulated signal source are also higher, and the temperature, the frequency deviation and the compensation parameters of the terminal device form a mapping relation, so that the frequency deviation of the terminal device can be accurately reduced based on the frequency deviation of the current time point of the terminal device and the clock source frequency adjusted by the compensation parameters corresponding to the temperature.
It should be understood that, in the embodiment of the present invention, the radio frequency unit 901 may be used for receiving and sending signals during a message transmission and reception process or a call process, and specifically, after receiving downlink data from a base station, the downlink data is processed by the processor 910; in addition, the uplink data is transmitted to the base station. Generally, the radio frequency unit 901 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 901 can also communicate with a network and other devices through a wireless communication system.
The terminal device provides wireless broadband internet access to the user through the network module 902, such as helping the user send and receive e-mails, browse webpages, access streaming media, and the like.
The audio output unit 903 may convert audio data received by the radio frequency unit 901 or the network module 902 or stored in the memory 909 into an audio signal and output as sound. Also, the audio output unit 903 may also provide audio output related to a specific function performed by the terminal apparatus 900 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 903 includes a speaker, a buzzer, a receiver, and the like.
The input unit 904 is used to receive audio or video signals. The input Unit 904 may include a Graphics Processing Unit (GPU) 9041 and a microphone 9042, and the Graphics processor 9041 processes image data of a still picture or video obtained by an image capturing device (such as a camera) in a video capture mode or an image capture mode. The processed image frames may be displayed on the display unit 906. The image frames processed by the graphic processor 9041 may be stored in the memory 909 (or other storage medium) or transmitted via the radio frequency unit 901 or the network module 902. The microphone 9042 can receive sounds and can process such sounds into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 901 in case of the phone call mode.
The terminal device 900 also includes at least one sensor 905, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 9061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 9061 and/or backlight when the terminal device 900 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal device posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; the sensors 905 may also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which are not described in detail herein.
The display unit 906 is used to display information input by the user or information provided to the user. The Display unit 906 may include a Display panel 9061, and the Display panel 9061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.
The user input unit 907 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal device. Specifically, the user input unit 907 includes a touch panel 9071 and other input devices 9072. The touch panel 9071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 9071 (e.g., operations by a user on or near the touch panel 9071 using a finger, a stylus, or any other suitable object or accessory). The touch panel 9071 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 910, receives a command from the processor 910, and executes the command. In addition, the touch panel 9071 may be implemented by using various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. The user input unit 907 may include other input devices 9072 in addition to the touch panel 9071. Specifically, the other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (such as a volume control key, a switch key, and the like), a track ball, a mouse, and a joystick, which are not described herein again.
Further, the touch panel 9071 may be overlaid on the display panel 9061, and when the touch panel 9071 detects a touch operation on or near the touch panel 9071, the touch panel is transmitted to the processor 910 to determine the type of the touch event, and then the processor 910 provides a corresponding visual output on the display panel 9061 according to the type of the touch event. Although in fig. 9, the touch panel 9071 and the display panel 9061 are implemented as two independent components to implement the input and output functions of the terminal device, in some embodiments, the touch panel 9071 and the display panel 9061 may be integrated to implement the input and output functions of the terminal device, which is not limited herein.
The interface unit 908 is an interface for connecting an external device to the terminal apparatus 900. 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 interface unit 908 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within the terminal apparatus 900 or may be used to transmit data between the terminal apparatus 900 and external devices.
The memory 909 may be used to store software programs as well as various data. The memory 909 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 909 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.
The processor 910 is a control center of the terminal device, connects various parts of the entire terminal device with various interfaces and lines, and performs various functions of the terminal device and processes data by running or executing software programs and/or modules stored in the memory 909 and calling data stored in the memory 909, thereby performing overall monitoring of the terminal device. Processor 910 may include one or more processing units; preferably, the processor 910 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It is to be appreciated that the modem processor described above may not be integrated into processor 910.
The terminal device 900 may further include a power supply 911 (e.g., a battery) for supplying power to various components, and preferably, the power supply 911 may be logically connected to the processor 910 through a power management system, so as to manage charging, discharging, and power consumption management functions through the power management system.
In addition, the terminal device 900 includes some functional modules that are not shown, and are not described in detail here.
Preferably, an embodiment of the present invention further provides a terminal device, which includes a processor 910, a memory 909, and a computer program stored in the memory 909 and capable of running on the processor 910, and when the computer program is executed by the processor 910, the processes of the above method for reducing frequency offset are implemented, and the same technical effect can be achieved, and in order to avoid repetition, details are not described here again.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above method for reducing frequency offset, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
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.
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 (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.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A method for reducing frequency offset, comprising:
demodulating a signal source of a current time point of terminal equipment, wherein the frequency stability of the signal source is less than or equal to a preset threshold value;
determining the frequency offset of the current time point of the terminal equipment based on the demodulated signal source;
if the frequency offset of the current time point of the terminal equipment is not in a preset range, adjusting the frequency of a clock source of the terminal equipment based on the frequency offset of the current time point of the terminal equipment and compensation parameters corresponding to the temperature;
the temperature, the frequency offset and the compensation parameter of the terminal equipment form a mapping relation;
wherein, the adjusting the clock source frequency of the terminal device based on the frequency offset of the current time point of the terminal device and the compensation parameter corresponding to the temperature includes:
acquiring the temperature of the current time point of the terminal equipment;
acquiring compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment;
and adjusting the clock source frequency of the terminal equipment based on the compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment.
2. The method of claim 1, wherein determining the frequency offset of the terminal device at the current time point based on the demodulated signal source comprises:
determining a frequency corresponding to the signal source based on the demodulated signal source;
and determining the frequency offset of the current time point of the terminal equipment based on the difference between the frequency corresponding to the signal source and the clock source frequency of the terminal equipment.
3. The method as claimed in claim 1, wherein adjusting the frequency of the clock source of the terminal device based on the compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal device comprises:
if the frequency offset of the current time point of the terminal equipment is a positive number, increasing the frequency of a clock source of the terminal equipment based on compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment;
and if the frequency offset of the current time point of the terminal equipment is a negative number, reducing the frequency of a clock source of the terminal equipment based on compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment.
4. The method according to any one of claims 1 to 3, wherein if the frequency offset of the current time point of the terminal device is not within a preset range, after adjusting the clock source frequency of the terminal device based on the compensation parameter corresponding to the frequency offset and the temperature of the current time point of the terminal device, the method further includes:
demodulating the signal source after the terminal equipment adjusts the frequency of the clock source;
determining the frequency offset of the terminal equipment after the clock source frequency is adjusted based on the demodulated signal source;
and if the frequency offset of the terminal equipment after the clock source frequency is adjusted is not within the preset range, adjusting the clock source frequency of the terminal equipment based on the frequency offset of the current time point of the terminal equipment and the compensation parameter corresponding to the temperature.
5. An apparatus for reducing frequency offset, comprising:
the demodulation unit is used for demodulating a signal source of the current time point of the terminal equipment, and the frequency stability of the signal source is less than or equal to a preset threshold value;
a determining unit, configured to determine, based on the demodulated signal source, a frequency offset of the terminal device at a current time point;
the adjusting unit is used for adjusting the frequency of a clock source of the terminal device based on the frequency offset of the current time point of the terminal device and a compensation parameter corresponding to the temperature if the frequency offset of the current time point of the terminal device is not within a preset range;
the temperature, the frequency offset and the compensation parameter of the terminal equipment form a mapping relation;
wherein the adjusting unit is configured to:
acquiring the temperature of the current time point of the terminal equipment;
acquiring compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment;
and adjusting the clock source frequency of the terminal equipment based on the compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment.
6. The apparatus of claim 5, wherein the determination unit is to:
determining a frequency corresponding to the signal source based on the demodulated signal source;
and determining the frequency offset of the current time point of the terminal equipment based on the difference between the frequency corresponding to the signal source and the clock source frequency of the terminal equipment.
7. The apparatus of claim 5, wherein the adjustment unit is to:
if the frequency offset of the current time point of the terminal equipment is a positive number, increasing the frequency of a clock source of the terminal equipment based on compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment;
and if the frequency offset of the current time point of the terminal equipment is a negative number, reducing the frequency of a clock source of the terminal equipment based on compensation parameters corresponding to the frequency offset and the temperature of the current time point of the terminal equipment.
8. The apparatus of any of claims 5 to 7, further comprising:
the first demodulation unit is used for demodulating the signal source after the terminal equipment adjusts the frequency of the clock source;
a first determining unit, configured to determine, based on the demodulated signal source, a frequency offset after the terminal device adjusts a clock source frequency;
and the first adjusting unit is used for adjusting the clock source frequency of the terminal device based on the frequency offset of the current time point of the terminal device and the compensation parameter corresponding to the temperature if the frequency offset of the terminal device after the clock source frequency is adjusted is not within the preset range.
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| CN109873636B (en) * | 2019-03-27 | 2023-05-05 | 维沃移动通信有限公司 | Frequency adjustment method and mobile terminal |
| CN110661738A (en) * | 2019-09-10 | 2020-01-07 | 上海庆科信息技术有限公司 | Frequency offset adjusting method and device, storage medium, processor and electronic device |
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