CN108449742A - A kind of aid demodulation system and method for near-field communication - Google Patents
A kind of aid demodulation system and method for near-field communication Download PDFInfo
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- CN108449742A CN108449742A CN201810205454.0A CN201810205454A CN108449742A CN 108449742 A CN108449742 A CN 108449742A CN 201810205454 A CN201810205454 A CN 201810205454A CN 108449742 A CN108449742 A CN 108449742A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
Abstract
The present invention provides a kind of aid demodulation system and method for near-field communication, and frequency meter and auxiliary signal generation module are arranged within the system；The frequency values of the carrier wave of data-signal are extracted by frequency meter, and the frequency values of carrier wave are sent to auxiliary signal generation module, and data-signal is that the radio-frequency antenna received signal amplitude of near-field communication equipment is more than the signal of communication of the first preset value；The auxiliary signal with carrier wave same frequency is generated by auxiliary signal generation module again, and auxiliary signal is sent to the demodulation module of near-field communication equipment, so that demodulation module demodulates signal of communication according to auxiliary signal；To during the primary interaction between near-field communication equipment, the demodulation module of near-field communication equipment is set persistently to receive and carrier wave same frequency signal, and it is demodulated according to the signal, current the case where since signal of communication is discontinuous needing that extraction carrier wave is repeated several times in demodulating process is avoided, ensure that the integrality of data transmission.
Description
Technical field
The present invention relates to fields of communication technology, more particularly, to a kind of aid demodulation system and method for near-field communication.
Background technology
Near-field communication (Near Field Communication, NFC) is also referred to as short-distance wireless communication, it allows electricity
Sub- equipment carries out contactless point-to-point data transmission between each other.NFC device includes reader (PCD) and proximity card
(PICC), reader can be continued for transmitting sine wave signal (electromagnetic wave), when proximity card appears within the scope of signal interference
When, proximity card obtains energy by way of coupling, and feeds back to the different signal (electromagnetic wave) of reader one.Confirming
After proximity card near field, reader will need the data transmitted to carry out in coded modulation to high frequency carrier, then by radio frequency day
Line transmits outward, and proximity card receives the signal of reader transmission by the inductive coupling of radio-frequency antenna, after being demodulated to signal
Order is obtained, reader then will be fed back to after the information encoded modulation of itself according to order, reader is anti-to proximity card
The information of feedback is being decoded.
By 14443 protocol realization information exchanges of ISO/IEC between reader and proximity card, which, which defines, penetrates
The carrier frequency of radiofrequency signal is 12.56MHz to 14.56MHz on frequency antenna, and reader or proximity card need to utilize carrier wave
The demodulation of the complete pair signals of signal ability is read since the carrier frequency of radiofrequency signal on radio-frequency antenna is a value range
Before device or proximity card are read to receiving signal demodulation, carrier wave need to be first extracted, is then demodulated according to carrier wave.
However, since proximity card is to obtain energy by way of coupling, then feedback signal results in reader and connects
Nearly formula card it is primary interact during will appear and there is no the case where electromagnetic field, signal of communication is discontinuous, current decoding process
It is to extract carrier wave again when signal of communication reappears, be then decoded to signal of communication, due to carry again every time
It is decoded again after taking carrier wave, the loss of data in data transmission procedure may be caused.
Invention content
In order to overcome the above problem or solve the above problems at least partly, the present invention provides a kind of the auxiliary of near-field communication
Help demodulating system and method.
According to an aspect of the present invention, a kind of aid demodulation system of near-field communication is provided, including：Frequency meter and auxiliary
Signal generation module；Frequency meter connects auxiliary signal generation module；Frequency meter, the frequency of the carrier wave for extracting data-signal
Value, and the frequency values of carrier wave are sent to auxiliary signal generation module, data-signal is that the radio-frequency antenna of near-field communication equipment connects
The signal amplitude of receipts is more than the signal of communication of the first preset value；Auxiliary signal generation module, for generating and carrier wave same frequency
Auxiliary signal, and auxiliary signal is sent to the demodulation module of near-field communication equipment, so that demodulation module is according to auxiliary signal pair
Signal of communication is demodulated.
Wherein, which further includes：Signal detection module；Signal detection module connects auxiliary signal generation module；Signal
Detection module, the signal amplitude for detecting signal of communication, when the signal amplitude for determining signal of communication is less than the second preset value,
Transmission instruction is sent to auxiliary signal generation module；Correspondingly, auxiliary signal generation module, for receiving transmission instruction
Afterwards, auxiliary signal is sent to the demodulation module of near-field communication equipment.
Wherein, auxiliary signal generation module includes crystal oscillator and clock multiplier/frequency dividing circuit；Crystal oscillator is used
In the pulse signal for generating fixed frequency；Clock multiplier/frequency dividing circuit, for the pulse signal of fixed frequency to be converted into and carry
The pulse signal of wave same frequency.
Wherein, auxiliary signal generation module further includes waveform translation circuit；Waveform translation circuit, being used for will be with carrier wave with frequency
The pulse signal of rate is converted into the signal with the predetermined waveform of carrier wave same frequency.
Wherein, which further includes：Reseting module；Reseting module rate of connections meter and auxiliary signal generation module；It resets
Module passes through the working condition of reset signal reset frequency meter or auxiliary signal generation module for generating reset signal.
Wherein, which further includes：Operation amplifier circuit；Operation amplifier circuit rate of connections meter；Operational amplifier
Circuit, for the signal amplitude of data-signal to be adjusted to third preset value or less.
Wherein, which further includes：AND gate circuit；AND gate circuit rate of connections meter；AND gate circuit is used for data-signal
Waveform be converted to square wave.
Another aspect of the present invention provides a kind of aid demodulation method of near-field communication, including：Extract the load of data-signal
The frequency values of wave, data-signal are that the radio-frequency antenna received signal amplitude of near-field communication equipment is more than the communication of the first preset value
Signal；According to the frequency values of carrier wave, the auxiliary signal with carrier wave same frequency is generated；Auxiliary signal is sent to near-field communication equipment
Demodulation module, so that demodulation module demodulates signal of communication according to auxiliary signal.
Wherein, further include after generating the auxiliary signal with carrier wave same frequency according to the frequency values of carrier wave：Detection communication
The signal amplitude of signal, judges whether the signal amplitude of signal of communication is less than the second preset value；Correspondingly, auxiliary signal is sent
To the demodulation module of near-field communication equipment, including：After the signal amplitude for determining signal of communication is less than the second preset value, it will assist
Signal is sent to the demodulation module of near-field communication equipment.
Frequency meter and auxiliary is arranged in a kind of aid demodulation system and method for near-field communication provided by the invention within the system
Help signal generation module；The frequency values of the carrier wave of data-signal are extracted by frequency meter, and the frequency values of carrier wave are sent to auxiliary
It is that the radio-frequency antenna received signal amplitude of near-field communication equipment is more than the first preset value to help signal generation module, data-signal
Signal of communication；The auxiliary signal with carrier wave same frequency is generated by auxiliary signal generation module again, and auxiliary signal is sent to
The demodulation module of near-field communication equipment, so that demodulation module demodulates signal of communication according to auxiliary signal；To near field
During primary interaction between communication equipment, so that the demodulation module of near-field communication equipment is persistently received and believe with carrier wave same frequency
Number, and demodulated according to the signal, avoids and current needed multiple in demodulating process since signal of communication is discontinuous
The case where repeating extraction carrier wave, ensure that the integrality of data transmission.
Description of the drawings
It, below will be to embodiment or the prior art in order to illustrate more clearly of the present invention or technical solution in the prior art
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is the one of the present invention
A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the schematic diagram according to the aid demodulation system of the near-field communication of the embodiment of the present invention；
Fig. 2 is the flow chart according to the aid demodulation method of the near-field communication of the embodiment of the present invention.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, is clearly and completely described the technical solution in the present invention, it is clear that described embodiment is a part of the invention
Embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
The every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
In one embodiment of the invention, with reference to figure 1, a kind of aid demodulation system of near-field communication is provided, including：Frequently
Rate meter 11 and auxiliary signal generation module 12；Frequency meter 11 connects auxiliary signal generation module 12；Frequency meter 11, for extracting number
It is believed that number carrier wave frequency values, and the frequency values of carrier wave are sent to auxiliary signal generation module 12, data-signal is near field
The radio-frequency antenna received signal amplitude of communication equipment is more than the signal of communication of the first preset value；Auxiliary signal generation module 12,
For generate with the auxiliary signal of carrier wave same frequency, and auxiliary signal is sent to the demodulation module of near-field communication equipment, for
Demodulation module demodulates signal of communication according to auxiliary signal.
Specifically, proximity card is that energy is obtained by way of coupling, then feedback signal, result in reader with it is close
Will appear during the primary interaction of formula card does not have the case where electromagnetic field, and signal of communication is sent and received with discontinuous, and near field is logical
The demodulation module of equipment is believed when being demodulated to signal of communication, need to extract carrier wave according to signal of communication, during signal of communication is interrupted,
Demodulation module can not continue extraction carrier wave then to be needed to extract carrier wave again, data may be caused to pass after signal of communication reappears
It is defeated imperfect.The present embodiment provides a kind of aid demodulation systems, including frequency meter 11, and frequency meter is also known as frequency counter, is
A kind of electronic measuring instrument specially measured to measured signal frequency, basic principle are that statistics measured signal is specific
Number of cycles in period, then the frequency of measured signal is the ratio of number of cycles and special time period.The present embodiment is nearly
The signal of communication that the radio-frequency antenna of field communication equipment receives extracts the carrier wave of signal of communication as measured signal；Since communication is believed
Number it is discontinuous reception to have centainly the intensity of signal of communication when frequency meter 11 extracts the frequency values of the carrier wave of signal of communication
Requirement, i.e., signal amplitude be more than the first preset value signal of communication.
After frequency meter 11 extracts the frequency values of the carrier wave of signal of communication, frequency values are sent to the auxiliary of aid demodulation system
Signal generation module 12, auxiliary signal generation module 12 are continuously generated the auxiliary signal with carrier wave same frequency, and in near-field communication
During interaction between equipment, continue the demodulation module that auxiliary signal is sent to near-field communication equipment, demodulation module is according to auxiliary
Help signal that signal of communication is mediated, in this way, no matter whether signal of communication survives, demodulation module persistently can be received and be carried
The auxiliary signal of wave same frequency, demodulation module are not necessarily to extract the carrier wave of signal of communication, can be real while signal of communication arrives
Demodulation is applied, ensure that the integrality of data transmission.Although the auxiliary signal generated by auxiliary signal generation module 12 with communicate letter
The phase of carrier wave in number may be inconsistent, but to the phase-unsensitive of signal in demodulating process, does not influence the result of demodulation.
The aid demodulation system of the present embodiment can be both arranged at reader end, can also be disposed proximate to formula card,
To reach the function of aid demodulation.
The present embodiment extracts the frequency values of the carrier wave of data-signal by frequency meter, and the frequency values of carrier wave is sent to auxiliary
It is that the radio-frequency antenna received signal amplitude of near-field communication equipment is more than the first preset value to help signal generation module, data-signal
Signal of communication；The auxiliary signal with carrier wave same frequency is generated by auxiliary signal generation module again, and auxiliary signal is sent to
The demodulation module of near-field communication equipment, so that demodulation module demodulates signal of communication according to auxiliary signal；To near field
During primary interaction between communication equipment, so that the demodulation module of near-field communication equipment is persistently received and believe with carrier wave same frequency
Number, and demodulated according to the signal, avoids and current needed multiple in demodulating process since signal of communication is discontinuous
The case where repeating extraction carrier wave, ensure that the integrality of data transmission.
Based on above example, which further includes：Signal detection module；Signal detection module connects auxiliary signal and generates
Module；Signal detection module, the signal amplitude for detecting signal of communication are less than second in the signal amplitude for determining signal of communication
When preset value, transmission instruction is sent to auxiliary signal generation module；Correspondingly, auxiliary signal generation module, for receiving
After transmission instruction, auxiliary signal is sent to the demodulation module of near-field communication equipment.
Specifically, extraction of the demodulation module to the carrier wave of signal of communication, it is desirable that the intensity of signal of communication meets certain condition,
It is too small in the intensity of signal of communication, carrier wave can not be extracted, also can not just be demodulated；The present embodiment using the intensity of signal of communication as to
Demodulation module sends a condition of auxiliary signal, and signal of communication is consecutive hours in primary interaction, then need not send auxiliary letter
Number, to save energy consumption, only in the case where signal of communication has interruption, send auxiliary signal.The present embodiment provides signal detection moulds
Block, the signal amplitude for detecting signal of communication, when the signal amplitude for determining signal of communication is less than the second preset value, instruction is auxiliary
Help signal generation module that auxiliary signal is sent to demodulation module.
Based on above example, auxiliary signal generation module includes crystal oscillator and clock multiplier/frequency dividing circuit；Crystal
Oscillator, the pulse signal for generating fixed frequency；Clock multiplier/frequency dividing circuit is used for the pulse signal of fixed frequency
It is converted into the pulse signal with carrier wave same frequency.
Specifically, crystal oscillator refers to cutting thin slice (referred to as chip) by certain azimuth from one piece of quartz crystal
It is packaged, and adds inside encapsulation integrated circuit and the oscillating circuit that forms.Crystal oscillator can generate frequency stabilization
Pulse signal, for example, the onboard crystal oscillator of FPGA belongs to crystal oscillator, frequency 100MHz.It is generated by crystal oscillator
Pulse signal frequency is stablized, but with the carrier frequency of signal of communication and differ, in the present embodiment, auxiliary signal generation module
In other than including crystal oscillator, further include clock multiplier/frequency dividing circuit, clock multiplier/frequency dividing circuit can be by the letter of input
Number doubling frequency and reduction after export, by clock multiplier/frequency dividing circuit, the fixed frequency that crystal oscillator can be generated
Pulse signal is adjusted to the pulse signal with carrier wave same frequency, to generate auxiliary signal.
Based on above example, auxiliary signal generation module further includes waveform translation circuit；Waveform translation circuit, being used for will
It is converted into the signal with the predetermined waveform of carrier wave same frequency with the pulse signal of carrier wave same frequency.
Specifically, pair with the auxiliary signal that is only generated by crystal oscillator and clock multiplier/frequency dividing circuit modulation, waveform
When for demodulating, effect may not be best, and in the present embodiment, waveform transformation electricity is also provided in auxiliary signal generation module
The waveform on road, signal of the waveform translation circuit to being generated by crystal oscillator and clock multiplier/frequency dividing circuit modulation is converted,
It is converted into being more suitable for the waveform of demodulation, such as square wave.
Based on above example, which further includes：Reseting module；Reseting module rate of connections meter and auxiliary signal generate
Module；Reseting module passes through the work of reset signal reset frequency meter or auxiliary signal generation module for generating reset signal
Make state.
Specifically, frequency meter or auxiliary signal generation module are likely to occur in communication process needs to reset working condition
The case where, and after communication, need to reset its working condition, the present embodiment aid demodulation system in provide and reset mould
Block, frequency meter or auxiliary signal generation module need reset working condition when send reset signal, in terms of reset frequency or
The working condition of person's auxiliary signal generation module.
Based on above example, which further includes：Operation amplifier circuit；Operation amplifier circuit rate of connections meter；
Operation amplifier circuit, for the signal amplitude of data-signal to be adjusted to third preset value or less.
Specifically, frequency meter is caused to can not work normally even damage frequency in order to avoid the power of signal of communication is excessive
Meter, the present embodiment aid demodulation system in operation amplifier circuit is provided, the operation amplifier circuit is by signal of communication
Amplitude is adjusted to third preset value or less (such as 5V).
Based on above example, which further includes：AND gate circuit；AND gate circuit rate of connections meter；AND gate circuit is used for
The waveform of data-signal is converted into square wave.
Specifically, the present embodiment aid demodulation system in the AND gate circuit that provides, the waveform of signal of communication is converted
Frequency meter is improved to measured signal in spy so that signal of communication can be handled after entering frequency meter with digital signal for square wave
The statistical accuracy for the number of cycles fixed time in section.
A kind of aid demodulation method of near-field communication is provided with reference to figure 2 as an alternative embodiment of the invention, including：
S21, extracts the frequency values of the carrier wave of data-signal, and data-signal is the radio-frequency antenna received signal amplitude of near-field communication equipment
More than the signal of communication of the first preset value；S22 generates the auxiliary signal with carrier wave same frequency according to the frequency values of carrier wave；S23,
Auxiliary signal is sent to the demodulation module of near-field communication equipment, so that demodulation module carries out signal of communication according to auxiliary signal
Demodulation.
Specifically, the frequency values of the carrier wave of data-signal are extracted；Since signal of communication is discontinuous reception, extraction communication
When the frequency of the carrier wave of signal, there are certain requirement, i.e. signal amplitude to be more than the logical of the first preset value to the intensity of signal of communication
Believe signal, the signal of communication of the condition will be met as data-signal.
After the frequency values for extracting the carrier wave of data-signal, it is continuously generated according to the frequency values of carrier wave auxiliary with carrier wave same frequency
Signal is helped, and during the interaction between near-field communication equipment, continues the demodulation that auxiliary signal is sent to near-field communication equipment
Module, demodulation module are mediated signal of communication according to auxiliary signal, in this way, no matter whether signal of communication survives, solve mode transfer
Block can persistently receive the auxiliary signal with carrier wave same frequency, and demodulation module is not necessarily to extract the carrier wave of signal of communication, communicate
Signal can implement demodulation while arrival, ensure that the integrality of data transmission.
The present embodiment is generated same with carrier wave by extracting the frequency values of the carrier wave of data-signal according to the frequency values of carrier wave
The auxiliary signal of frequency；Auxiliary signal is sent to the demodulation module of near-field communication equipment, so that demodulation module is believed according to auxiliary
Number signal of communication is demodulated；To during the primary interaction between near-field communication equipment, make the solution of near-field communication equipment
Mode transfer block can persistently receive with carrier wave same frequency signal, and demodulated, avoided current demodulated according to the signal
The case where since signal of communication is discontinuous needing that extraction carrier wave is repeated several times in journey, ensure that the integrality of data transmission.
Based on above example, also wrapped after generating the auxiliary signal with carrier wave same frequency according to the frequency values of carrier wave
It includes：The signal amplitude for detecting signal of communication, judges whether the signal amplitude of signal of communication is less than the second preset value；Correspondingly, will
Auxiliary signal is sent to the demodulation module of near-field communication equipment, including：It is pre- to be less than second in the signal amplitude for determining signal of communication
If after value, auxiliary signal is sent to the demodulation module of near-field communication equipment.
Specifically, the present embodiment using the intensity of signal of communication as to demodulation module send auxiliary signal a condition,
Signal of communication is consecutive hours in primary interaction, then need not send auxiliary signal only has interruption to save energy consumption in signal of communication
In the case of, send auxiliary signal；The signal amplitude for detecting signal of communication is less than the in the signal amplitude for determining signal of communication
When two preset values, auxiliary signal is sent to demodulation module.
What is finally illustrated is：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although ginseng
According to previous embodiment, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be with
Technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；And
These modifications or replacements, the spirit and model of various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (9)
1. a kind of aid demodulation system of near-field communication, which is characterized in that including：Frequency meter and auxiliary signal generation module；
The frequency meter connects the auxiliary signal generation module；
The frequency meter, the frequency values of the carrier wave for extracting data-signal, and the frequency values of the carrier wave are sent to described
Auxiliary signal generation module, the data-signal are that the radio-frequency antenna received signal amplitude of near-field communication equipment is more than first in advance
If the signal of communication of value；
The auxiliary signal generation module, for generating and the auxiliary signal of the carrier wave same frequency, and by the auxiliary signal
It is sent to the demodulation module of the near-field communication equipment, so that the demodulation module believes the communication according to the auxiliary signal
It number is demodulated.
2. system according to claim 1, which is characterized in that the system also includes：Signal detection module；
The signal detection module connects the auxiliary signal generation module；
The signal detection module, the signal amplitude for detecting the signal of communication, in the signal for determining the signal of communication
When amplitude is less than the second preset value, transmission instruction is sent to the auxiliary signal generation module；
Correspondingly, the auxiliary signal generation module, for after receiving the transmission instruction, the auxiliary signal to be sent
To the demodulation module of the near-field communication equipment.
3. system according to claim 1, which is characterized in that the auxiliary signal generation module include crystal oscillator and
Clock multiplier/frequency dividing circuit；
The crystal oscillator, the pulse signal for generating fixed frequency；
Clock multiplier/the frequency dividing circuit, for the pulse signal of fixed frequency to be converted into the arteries and veins with the carrier wave same frequency
Rush signal.
4. system according to claim 3, which is characterized in that the auxiliary signal generation module further includes waveform transformation electricity
Road；
The waveform translation circuit, for will be converted into and the carrier wave same frequency with the pulse signal of the carrier wave same frequency
The signal of predetermined waveform.
5. system according to claim 1, which is characterized in that the system also includes：Reseting module；
The reseting module connects the frequency meter and the auxiliary signal generation module；
The reseting module resets the frequency meter or the auxiliary for generating reset signal by the reset signal
The working condition of signal generation module.
6. system according to claim 1, which is characterized in that the system also includes：Operation amplifier circuit；
The operation amplifier circuit connects the frequency meter；
The operation amplifier circuit, for the signal amplitude of the data-signal to be adjusted to third preset value or less.
7. system according to claim 1, which is characterized in that the system also includes：AND gate circuit；
The AND gate circuit connects the frequency meter；
The AND gate circuit, for the waveform of the data-signal to be converted to square wave.
8. a kind of aid demodulation method of near-field communication, which is characterized in that including：
The frequency values of the carrier wave of data-signal are extracted, the data-signal is the radio-frequency antenna received signal of near-field communication equipment
Amplitude is more than the signal of communication of the first preset value；
According to the frequency values of the carrier wave, the auxiliary signal with the carrier wave same frequency is generated；
The auxiliary signal is sent to the demodulation module of the near-field communication equipment, so that the demodulation module is according to described auxiliary
Signal is helped to demodulate the signal of communication.
9. according to the method described in claim 8, it is characterized in that, the frequency values according to the carrier wave, generate with it is described
After the auxiliary signal of carrier wave same frequency, further include：The signal amplitude for detecting the signal of communication judges the signal of communication
Whether signal amplitude is less than the second preset value；
Correspondingly, the demodulation module that the auxiliary signal is sent to the near-field communication equipment, including：Described in determination
After the signal amplitude of signal of communication is less than the second preset value, the auxiliary signal is sent to the demodulation of the near-field communication equipment
Module.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113115296A (en) * | 2021-04-25 | 2021-07-13 | Oppo广东移动通信有限公司 | Near field communication method and related device |
| CN115333579A (en) * | 2021-05-11 | 2022-11-11 | 意法半导体(鲁塞)公司 | Near field communication device |
| CN116366077A (en) * | 2023-06-02 | 2023-06-30 | 北京安天网络安全技术有限公司 | Control method, device, equipment and medium of software defined radio equipment |
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| CN104883249A (en) * | 2015-06-16 | 2015-09-02 | 桂林电子科技大学 | Time synchronization relay system and method based on wireless communication |
| CN106992818A (en) * | 2017-06-05 | 2017-07-28 | 吉林大学 | A kind of phase generated carrier demodulation device and method program control based on phase |
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| CN113115296A (en) * | 2021-04-25 | 2021-07-13 | Oppo广东移动通信有限公司 | Near field communication method and related device |
| CN115333579A (en) * | 2021-05-11 | 2022-11-11 | 意法半导体(鲁塞)公司 | Near field communication device |
| CN115333579B (en) * | 2021-05-11 | 2024-01-23 | 意法半导体(鲁塞)公司 | Near field communication device |
| CN116366077A (en) * | 2023-06-02 | 2023-06-30 | 北京安天网络安全技术有限公司 | Control method, device, equipment and medium of software defined radio equipment |
| CN116366077B (en) * | 2023-06-02 | 2023-07-28 | 北京安天网络安全技术有限公司 | Control method, device, equipment and medium of software defined radio equipment |
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