技术领域technical field
本发明涉及通信技术领域，更具体地，涉及一种近场通信的辅助解调系统和方法。The present invention relates to the technical field of communication, and more specifically, to an auxiliary demodulation system and method for near field communication.
背景技术Background technique
近场通信(Near Field Communication，NFC)又称之为短距离无线通信，它允许电子设备相互之间进行非接触式的点对点的数据传输。NFC设备包括阅读器(PCD)和接近式卡(PICC)，阅读器会一直持续发射正弦波信号(电磁波)，当接近式卡出现在信号干扰范围内时，接近式卡通过耦合的方式获取能量，并反馈给阅读器一个不同的信号(电磁波)。在确认近场内的接近式卡后，阅读器将需要传送的数据进行编码调制到高频载波上，再由射频天线向外传送，接近式卡通过射频天线的电感耦合来接收阅读器发送的信号，对信号解调后获取命令，然后根据命令将自身的信息经编码调制后反馈给阅读器，阅读器对接近式卡反馈的信息在进行解码。Near Field Communication (NFC), also known as short-range wireless communication, allows electronic devices to perform non-contact point-to-point data transmission between each other. NFC devices include a reader (PCD) and a proximity card (PICC). The reader will continuously emit a sine wave signal (electromagnetic wave). When the proximity card appears within the signal interference range, the proximity card obtains energy through coupling. , and feed back a different signal (electromagnetic wave) to the reader. After confirming the proximity card in the near field, the reader codes and modulates the data to be transmitted onto the high-frequency carrier, and then transmits it outward by the radio frequency antenna. The proximity card receives the data sent by the reader through the inductive coupling of the radio frequency antenna. After demodulating the signal, the command is obtained, and then the information of itself is coded and modulated according to the command and fed back to the reader, and the reader decodes the information fed back by the proximity card.
阅读器和接近式卡之间通过ISO/IEC 14443协议实现信息交互，该协议规定了射频天线上射频信号的载波频率为12.56MHz到14.56MHz，阅读器或者接近式卡需要利用载波信号才能完成对信号的解调，由于射频天线上射频信号的载波频率是一个范围值，因此阅读器或者接近式卡对接收到信号解调前，需先提取载波，然后依据载波进行解调。The information exchange between the reader and the proximity card is realized through the ISO/IEC 14443 protocol, which stipulates that the carrier frequency of the radio frequency signal on the radio frequency antenna is 12.56MHz to 14.56MHz, and the reader or the proximity card needs to use the carrier signal to complete the communication. For signal demodulation, since the carrier frequency of the RF signal on the RF antenna is a range value, the reader or proximity card needs to extract the carrier before demodulating the received signal, and then demodulate according to the carrier.
然而，由于接近式卡是通过耦合的方式获取能量，再反馈信号，导致了阅读器与接近式卡的一次交互期间会出现没有电磁场的情况，通信信号是不连续的，目前的解码方式是当通信信号重新出现时，重新提取载波，然后对通信信号进行解码，由于每次都要重新提取载波后再进行解码，可能导致数据传输过程中的数据丢失。However, since the proximity card obtains energy through coupling and then feeds back the signal, there will be no electromagnetic field during an interaction between the reader and the proximity card, and the communication signal is discontinuous. The current decoding method is when When the communication signal reappears, the carrier is re-extracted, and then the communication signal is decoded. Since the carrier must be re-extracted and then decoded each time, data loss during data transmission may occur.
发明内容Contents of the invention
为了克服上述问题或者至少部分地解决上述问题，本发明提供一种近场通信的辅助解调系统和方法。In order to overcome the above problems or at least partly solve the above problems, the present invention provides an auxiliary demodulation system and method for near field communication.
根据本发明的一个方面，提供一种近场通信的辅助解调系统，包括：频率计和辅助信号生成模块；频率计连接辅助信号生成模块；频率计，用于提取数据信号的载波的频率值，并将载波的频率值发送至辅助信号生成模块，数据信号为近场通信设备的射频天线接收的信号幅度大于第一预设值的通信信号；辅助信号生成模块，用于生成与载波同频率的辅助信号，并将辅助信号发送至近场通信设备的解调模块，以供解调模块根据辅助信号对通信信号进行解调。According to one aspect of the present invention, an auxiliary demodulation system for near-field communication is provided, including: a frequency meter and an auxiliary signal generation module; the frequency meter is connected to the auxiliary signal generation module; the frequency meter is used to extract the frequency value of the carrier of the data signal , and send the frequency value of the carrier to the auxiliary signal generation module, the data signal is a communication signal whose amplitude is greater than the first preset value received by the radio frequency antenna of the near-field communication device; the auxiliary signal generation module is used to generate the same frequency as the carrier auxiliary signal, and send the auxiliary signal to the demodulation module of the near field communication device, so that the demodulation module demodulates the communication signal according to the auxiliary signal.
其中，该系统还包括：信号检测模块；信号检测模块连接辅助信号生成模块；信号检测模块，用于检测通信信号的信号幅度，在确定通信信号的信号幅度小于第二预设值时，向辅助信号生成模块发送传输指令；相应地，辅助信号生成模块，用于在接收到传输指令后，将辅助信号发送至近场通信设备的解调模块。Wherein, the system also includes: a signal detection module; the signal detection module is connected to the auxiliary signal generation module; the signal detection module is used to detect the signal amplitude of the communication signal, and when it is determined that the signal amplitude of the communication signal is less than the second preset value, send an auxiliary signal to the auxiliary signal. The signal generation module sends the transmission instruction; correspondingly, the auxiliary signal generation module is configured to send the auxiliary signal to the demodulation module of the near field communication device after receiving the transmission instruction.
其中，辅助信号生成模块包括晶体振荡器和时钟倍频/分频电路；晶体振荡器，用于生成固定频率的脉冲信号；时钟倍频/分频电路，用于将固定频率的脉冲信号转换成与载波同频率的脉冲信号。Wherein, the auxiliary signal generating module includes a crystal oscillator and a clock frequency multiplication/frequency division circuit; the crystal oscillator is used to generate a fixed frequency pulse signal; the clock frequency multiplication/frequency division circuit is used to convert the fixed frequency pulse signal into A pulse signal with the same frequency as the carrier.
其中，辅助信号生成模块还包括波形变换电路；波形变换电路，用于将与载波同频率的脉冲信号转换成与载波同频率的预设波形的信号。Wherein, the auxiliary signal generation module also includes a waveform conversion circuit; the waveform conversion circuit is used to convert the pulse signal with the same frequency as the carrier into a preset waveform signal with the same frequency as the carrier.
其中，该系统还包括：复位模块；复位模块连接频率计和辅助信号生成模块；复位模块，用于产生复位信号，通过复位信号重置频率计或者辅助信号生成模块的工作状态。Wherein, the system also includes: a reset module; the reset module is connected to the frequency meter and the auxiliary signal generating module; the reset module is used to generate a reset signal, and reset the working state of the frequency meter or the auxiliary signal generating module through the reset signal.
其中，该系统还包括：运算放大器电路；运算放大器电路连接频率计；运算放大器电路，用于将数据信号的信号幅度调整到第三预设值以下。Wherein, the system further includes: an operational amplifier circuit; the operational amplifier circuit is connected to a frequency meter; the operational amplifier circuit is used to adjust the signal amplitude of the data signal below the third preset value.
其中，该系统还包括：与门电路；与门电路连接频率计；与门电路，用于将数据信号的波形转换为方波。Wherein, the system also includes: an AND gate circuit; the AND gate circuit is connected with a frequency meter; and the AND gate circuit is used for converting the waveform of the data signal into a square wave.
本发明的另一方面，提供一种近场通信的辅助解调方法，包括：提取数据信号的载波的频率值，数据信号为近场通信设备的射频天线接收的信号幅度大于第一预设值的通信信号；根据载波的频率值，生成与载波同频率的辅助信号；将辅助信号发送至近场通信设备的解调模块，以供解调模块根据辅助信号对通信信号进行解调。Another aspect of the present invention provides an auxiliary demodulation method for near-field communication, including: extracting the frequency value of the carrier of the data signal, the data signal is that the amplitude of the signal received by the radio frequency antenna of the near-field communication device is greater than the first preset value The communication signal; according to the frequency value of the carrier, generate an auxiliary signal with the same frequency as the carrier; send the auxiliary signal to the demodulation module of the near-field communication device, so that the demodulation module can demodulate the communication signal according to the auxiliary signal.
其中，根据载波的频率值，生成与载波同频率的辅助信号之后，还包括：检测通信信号的信号幅度，判断通信信号的信号幅度是否小于第二预设值；相应地，将辅助信号发送至近场通信设备的解调模块，包括：在确定通信信号的信号幅度小于第二预设值后，将辅助信号发送至近场通信设备的解调模块。Wherein, according to the frequency value of the carrier, after generating the auxiliary signal with the same frequency as the carrier, it also includes: detecting the signal amplitude of the communication signal, and judging whether the signal amplitude of the communication signal is smaller than the second preset value; correspondingly, sending the auxiliary signal to the near The demodulation module of the field communication device includes: after determining that the signal amplitude of the communication signal is smaller than the second preset value, sending the auxiliary signal to the demodulation module of the near field communication device.
本发明提供的一种近场通信的辅助解调系统和方法，在该系统中设置频率计和辅助信号生成模块；通过频率计提取数据信号的载波的频率值，并将载波的频率值发送至辅助信号生成模块，数据信号为近场通信设备的射频天线接收的信号幅度大于第一预设值的通信信号；再通过辅助信号生成模块生成与载波同频率的辅助信号，并将辅助信号发送至近场通信设备的解调模块，以供解调模块根据辅助信号对通信信号进行解调；从而在近场通信设备之间的一次交互期间，使近场通信设备的解调模块能持续接收到与载波同频率信号，并依据该信号进行解调，避免了目前的在解调过程中由于通信信号不连续而需要多次重复提取载波的情况，保证了数据传输的完整性。The present invention provides an auxiliary demodulation system and method for near-field communication, in which a frequency meter and an auxiliary signal generation module are set; the frequency value of the carrier of the data signal is extracted by the frequency meter, and the frequency value of the carrier is sent to Auxiliary signal generation module, the data signal is a communication signal whose signal amplitude received by the radio frequency antenna of the near field communication device is greater than the first preset value; then the auxiliary signal generation module generates an auxiliary signal with the same frequency as the carrier, and sends the auxiliary signal to the near field The demodulation module of the field communication device is used for the demodulation module to demodulate the communication signal according to the auxiliary signal; so that during an interaction between the near field communication devices, the demodulation module of the near field communication device can continuously receive The carrier has the same frequency as the signal, and demodulation is performed based on the signal, which avoids the need to repeatedly extract the carrier due to the discontinuity of the communication signal in the demodulation process, and ensures the integrity of the data transmission.
附图说明Description of drawings
为了更清楚地说明本发明或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are the present invention. For some embodiments of the invention, those skilled in the art can also obtain other drawings based on these drawings without creative effort.
图1为根据本发明实施例的近场通信的辅助解调系统的示意图；FIG. 1 is a schematic diagram of an auxiliary demodulation system for near field communication according to an embodiment of the present invention;
图2为根据本发明实施例的近场通信的辅助解调方法的流程图。Fig. 2 is a flow chart of an auxiliary demodulation method for near field communication according to an embodiment of the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
在本发明的一个实施例中，参考图1，提供一种近场通信的辅助解调系统，包括：频率计11和辅助信号生成模块12；频率计11连接辅助信号生成模块12；频率计11，用于提取数据信号的载波的频率值，并将载波的频率值发送至辅助信号生成模块12，数据信号为近场通信设备的射频天线接收的信号幅度大于第一预设值的通信信号；辅助信号生成模块12，用于生成与载波同频率的辅助信号，并将辅助信号发送至近场通信设备的解调模块，以供解调模块根据辅助信号对通信信号进行解调。In one embodiment of the present invention, referring to FIG. 1 , an auxiliary demodulation system for near field communication is provided, including: a frequency meter 11 and an auxiliary signal generating module 12; the frequency meter 11 is connected to the auxiliary signal generating module 12; the frequency meter 11 , for extracting the frequency value of the carrier of the data signal, and sending the frequency value of the carrier to the auxiliary signal generation module 12, the data signal is a communication signal whose signal amplitude received by the radio frequency antenna of the near field communication device is greater than the first preset value; The auxiliary signal generating module 12 is configured to generate an auxiliary signal with the same frequency as the carrier, and send the auxiliary signal to the demodulation module of the near field communication device, so that the demodulation module can demodulate the communication signal according to the auxiliary signal.
具体地，接近式卡是通过耦合的方式获取能量，再反馈信号，导致了阅读器与接近式卡的一次交互期间会出现没有电磁场的情况，通信信号以间断式的发送与接收，近场通信设备的解调模块在对通信信号解调时，需根据通信信号提取载波，在通信信号间断期间，解调模块无法持续提取载波，在通信信号重新出现后，则需重新提取载波，可能导致数据传输不完整。本实施例提供一种辅助解调系统，包括频率计11，频率计又称为频率计数器，是一种专门对被测信号频率进行测量的电子测量仪器，其基本原理为，统计被测信号在特定时间段内的周期个数，则被测信号的频率为周期个数与特定时间段的比值。本实施例将近场通信设备的射频天线接收的通信信号作为被测信号，提取通信信号的载波；由于通信信号是间断式接收的，频率计11提取通信信号的载波的频率值时，对通信信号的强度有一定的要求，即信号幅度大于第一预设值的通信信号。Specifically, the proximity card obtains energy through coupling, and then feeds back the signal, resulting in the absence of an electromagnetic field during an interaction between the reader and the proximity card, and the communication signal is sent and received intermittently. Near field communication When the demodulation module of the device demodulates the communication signal, it needs to extract the carrier according to the communication signal. During the interruption of the communication signal, the demodulation module cannot continue to extract the carrier. After the communication signal reappears, it needs to extract the carrier again, which may cause data loss. The transfer was incomplete. This embodiment provides an auxiliary demodulation system, including a frequency meter 11. The frequency meter is also called a frequency counter, which is an electronic measuring instrument specially used to measure the frequency of the signal under test. The number of cycles in a specific time period, the frequency of the measured signal is the ratio of the number of cycles to the specific time period. In this embodiment, the communication signal received by the radio frequency antenna of the near-field communication device is used as the signal to be tested, and the carrier of the communication signal is extracted; since the communication signal is intermittently received, when the frequency meter 11 extracts the frequency value of the carrier of the communication signal, the communication signal There are certain requirements for the strength of the communication signal, that is, the communication signal whose signal amplitude is greater than the first preset value.
频率计11提取通信信号的载波的频率值后，将频率值发送至辅助解调系统的辅助信号生成模块12，辅助信号生成模块12持续生成与载波同频率的辅助信号，并在近场通信设备之间的交互期间，持续将辅助信号发送给近场通信设备的解调模块，解调模块根据辅助信号对通信信号进行调解，这样，无论通信信号是否存续，解调模块均能持续接收到与载波同频率的辅助信号，解调模块无需提取通信信号的载波，在通信信号到来的同时就能实施解调，保证了数据传输的完整性。虽然由辅助信号生成模块12产生的辅助信号与通信信号中的载波的相位可能不一致，但是解调过程中对信号的相位不敏感，不影响解调的结果。After the frequency meter 11 extracts the frequency value of the carrier of the communication signal, the frequency value is sent to the auxiliary signal generation module 12 of the auxiliary demodulation system. During the interaction between them, the auxiliary signal is continuously sent to the demodulation module of the near-field communication device, and the demodulation module mediates the communication signal according to the auxiliary signal. In this way, regardless of whether the communication signal exists or not, the demodulation module can continue to receive the same For the auxiliary signal with the same frequency as the carrier, the demodulation module does not need to extract the carrier of the communication signal, and can perform demodulation when the communication signal arrives, ensuring the integrity of data transmission. Although the phase of the auxiliary signal generated by the auxiliary signal generating module 12 may not be consistent with the carrier in the communication signal, the demodulation process is not sensitive to the phase of the signal and does not affect the demodulation result.
本实施例的辅助解调系统既可以设置在阅读器端，也可以设置在接近式卡，均可以达到辅助解调的功能。The auxiliary demodulation system in this embodiment can be set either at the reader end or at the proximity card, both of which can achieve the function of auxiliary demodulation.
本实施例通过频率计提取数据信号的载波的频率值，并将载波的频率值发送至辅助信号生成模块，数据信号为近场通信设备的射频天线接收的信号幅度大于第一预设值的通信信号；再通过辅助信号生成模块生成与载波同频率的辅助信号，并将辅助信号发送至近场通信设备的解调模块，以供解调模块根据辅助信号对通信信号进行解调；从而在近场通信设备之间的一次交互期间，使近场通信设备的解调模块能持续接收到与载波同频率信号，并依据该信号进行解调，避免了目前的在解调过程中由于通信信号不连续而需要多次重复提取载波的情况，保证了数据传输的完整性。In this embodiment, the frequency value of the carrier wave of the data signal is extracted by a frequency meter, and the frequency value of the carrier wave is sent to the auxiliary signal generation module, and the data signal is a communication in which the amplitude of the signal received by the radio frequency antenna of the near-field communication device is greater than the first preset value signal; then generate an auxiliary signal with the same frequency as the carrier through the auxiliary signal generation module, and send the auxiliary signal to the demodulation module of the near-field communication device, so that the demodulation module can demodulate the communication signal according to the auxiliary signal; thus in the near field During an interaction between communication devices, the demodulation module of the near-field communication device can continuously receive the signal with the same frequency as the carrier, and demodulate based on the signal, avoiding the current discontinuous communication signal during the demodulation process. In the case where the carrier wave needs to be repeatedly extracted, the integrity of data transmission is guaranteed.
基于以上实施例，该系统还包括：信号检测模块；信号检测模块连接辅助信号生成模块；信号检测模块，用于检测通信信号的信号幅度，在确定通信信号的信号幅度小于第二预设值时，向辅助信号生成模块发送传输指令；相应地，辅助信号生成模块，用于在接收到传输指令后，将辅助信号发送至近场通信设备的解调模块。Based on the above embodiments, the system also includes: a signal detection module; the signal detection module is connected to the auxiliary signal generation module; the signal detection module is used to detect the signal amplitude of the communication signal, and when it is determined that the signal amplitude of the communication signal is less than the second preset value , sending a transmission instruction to the auxiliary signal generation module; correspondingly, the auxiliary signal generation module is configured to send the auxiliary signal to the demodulation module of the near field communication device after receiving the transmission instruction.
具体地，解调模块对通信信号的载波的提取，要求通信信号的强度满足一定条件，在通信信号的强度过小，无法提取载波，也就无法解调；本实施例将通信信号的强度作为向解调模块发送辅助信号的一个条件，在一次交互中通信信号为连续时，则无须发送辅助信号，以节省能耗，仅在通信信号有中断的情况下，发送辅助信号。本实施例提供信号检测模块，用于检测通信信号的信号幅度，在确定通信信号的信号幅度小于第二预设值时，指令辅助信号生成模块将辅助信号发送至解调模块。Specifically, the extraction of the carrier of the communication signal by the demodulation module requires the strength of the communication signal to meet certain conditions. If the strength of the communication signal is too small, the carrier cannot be extracted, and demodulation cannot be performed; in this embodiment, the strength of the communication signal is used as A condition for sending the auxiliary signal to the demodulation module is that when the communication signal is continuous in an interaction, there is no need to send the auxiliary signal to save energy consumption, and the auxiliary signal is only sent when the communication signal is interrupted. This embodiment provides a signal detection module for detecting the signal amplitude of the communication signal, and instructing the auxiliary signal generation module to send the auxiliary signal to the demodulation module when it is determined that the signal amplitude of the communication signal is smaller than the second preset value.
基于以上实施例，辅助信号生成模块包括晶体振荡器和时钟倍频/分频电路；晶体振荡器，用于生成固定频率的脉冲信号；时钟倍频/分频电路，用于将固定频率的脉冲信号转换成与载波同频率的脉冲信号。Based on the above embodiments, the auxiliary signal generation module includes a crystal oscillator and a clock frequency multiplication/frequency division circuit; the crystal oscillator is used to generate a fixed-frequency pulse signal; the clock frequency multiplication/frequency division circuit is used to convert the fixed-frequency pulse The signal is converted into a pulse signal with the same frequency as the carrier.
具体地，晶体振荡器是指从一块石英晶体上按一定方位角切下薄片(简称为晶片)进行封装，并在封装内部添加集成电路而组成的振荡电路。晶体振荡器能产生频率稳定的脉冲信号，例如，FPGA的板载晶振属于晶体振荡器，其频率为100MHz。由晶体振荡器产生的脉冲信号频率稳定，但是和通信信号的载波频率并不相同，本实施例中，辅助信号生成模块中除了包括晶体振荡器外，还包括时钟倍频/分频电路，时钟倍频/分频电路能将输入的信号的频率加倍和降低后输出，通过时钟倍频/分频电路，能将晶体振荡器产生的固定频率的脉冲信号调整为与载波同频率的脉冲信号，以生成辅助信号。Specifically, a crystal oscillator refers to an oscillating circuit formed by cutting a thin slice (referred to as a wafer) from a quartz crystal at a certain azimuth angle for packaging, and adding an integrated circuit inside the package. The crystal oscillator can generate a pulse signal with stable frequency. For example, the onboard crystal oscillator of the FPGA belongs to the crystal oscillator, and its frequency is 100MHz. The frequency of the pulse signal generated by the crystal oscillator is stable, but it is not the same as the carrier frequency of the communication signal. In this embodiment, in addition to the crystal oscillator, the auxiliary signal generation module also includes a clock frequency multiplication/division circuit, a clock The frequency multiplication/division circuit can double and reduce the frequency of the input signal and output it. Through the clock frequency multiplication/division circuit, the fixed-frequency pulse signal generated by the crystal oscillator can be adjusted to a pulse signal with the same frequency as the carrier. to generate auxiliary signals.
基于以上实施例，辅助信号生成模块还包括波形变换电路；波形变换电路，用于将与载波同频率的脉冲信号转换成与载波同频率的预设波形的信号。Based on the above embodiments, the auxiliary signal generating module further includes a waveform conversion circuit; the waveform conversion circuit is used to convert the pulse signal with the same frequency as the carrier into a signal with a preset waveform with the same frequency as the carrier.
具体地，对与仅由晶体振荡器和时钟倍频/分频电路调制生成的辅助信号，其波形用于解调时，效果可能并不是最好，本实施例中，在辅助信号生成模块中还提供波形变换电路，波形变换电路对由晶体振荡器和时钟倍频/分频电路调制生成的信号的波形进行转换，转换成更适于解调的波形，如方波。Specifically, for the auxiliary signal modulated and generated only by the crystal oscillator and the clock frequency multiplication/division circuit, when its waveform is used for demodulation, the effect may not be the best. In this embodiment, in the auxiliary signal generation module A waveform conversion circuit is also provided, and the waveform conversion circuit converts the waveform of the signal modulated by the crystal oscillator and the clock frequency multiplication/division circuit into a waveform more suitable for demodulation, such as a square wave.
基于以上实施例，该系统还包括：复位模块；复位模块连接频率计和辅助信号生成模块；复位模块，用于产生复位信号，通过复位信号重置频率计或者辅助信号生成模块的工作状态。Based on the above embodiments, the system further includes: a reset module; the reset module is connected to the frequency meter and the auxiliary signal generating module; the reset module is used to generate a reset signal, and reset the working state of the frequency meter or the auxiliary signal generating module through the reset signal.
具体地，频率计或者辅助信号生成模块在通信过程中可能出现需要重置工作状态的情况，以及通信完毕后，需要重置其工作状态，本实施例在的辅助解调系统中提供复位模块，在频率计或者辅助信号生成模块需要重置工作状态时发送复位信号，以重置频率计或者辅助信号生成模块的工作状态。Specifically, the frequency meter or the auxiliary signal generation module may need to reset the working state during the communication process, and after the communication is completed, the working state needs to be reset. This embodiment provides a reset module in the auxiliary demodulation system. When the frequency meter or the auxiliary signal generating module needs to reset the working state, a reset signal is sent to reset the working state of the frequency meter or the auxiliary signal generating module.
基于以上实施例，该系统还包括：运算放大器电路；运算放大器电路连接频率计；运算放大器电路，用于将数据信号的信号幅度调整到第三预设值以下。Based on the above embodiments, the system further includes: an operational amplifier circuit; the operational amplifier circuit is connected to a frequency meter; the operational amplifier circuit is used to adjust the signal amplitude of the data signal below the third preset value.
具体地，为了避免通信信号的功率过大导致频率计无法正常工作甚至损坏频率计，本实施例在的辅助解调系统中提供运算放大器电路，该运算放大器电路将通信信号的幅度调整到第三预设值以下(例如5V)。Specifically, in order to prevent the frequency meter from being unable to work normally or even damage the frequency meter due to excessive power of the communication signal, this embodiment provides an operational amplifier circuit in the auxiliary demodulation system, and the operational amplifier circuit adjusts the amplitude of the communication signal to the third Below the preset value (eg 5V).
基于以上实施例，该系统还包括：与门电路；与门电路连接频率计；与门电路，用于将数据信号的波形转换为方波。Based on the above embodiments, the system further includes: an AND gate circuit; the AND gate circuit is connected to a frequency meter; and the AND gate circuit is used to convert the waveform of the data signal into a square wave.
具体地，本实施例在的辅助解调系统中提供的与门电路，将通信信号的波形转换为方波，以使通信信号进入频率计后能以数字信号进行处理，提高频率计对被测信号在特定时间段内的周期个数的统计精度。Specifically, the AND gate circuit provided in the auxiliary demodulation system of this embodiment converts the waveform of the communication signal into a square wave, so that the communication signal can be processed as a digital signal after entering the frequency meter, and the frequency meter is more accurate to the measured signal. The statistical accuracy of the number of periods of a signal within a specified time period.
作为本发明的另一个实施例，参考图2，提供一种近场通信的辅助解调方法，包括：S21，提取数据信号的载波的频率值，数据信号为近场通信设备的射频天线接收的信号幅度大于第一预设值的通信信号；S22，根据载波的频率值，生成与载波同频率的辅助信号；S23，将辅助信号发送至近场通信设备的解调模块，以供解调模块根据辅助信号对通信信号进行解调。As another embodiment of the present invention, with reference to FIG. 2 , an auxiliary demodulation method for near field communication is provided, including: S21, extracting the frequency value of the carrier of the data signal, the data signal is received by the radio frequency antenna of the near field communication device The communication signal whose signal amplitude is greater than the first preset value; S22, generate an auxiliary signal with the same frequency as the carrier according to the frequency value of the carrier; S23, send the auxiliary signal to the demodulation module of the near-field communication device for the demodulation module to The auxiliary signal demodulates the communication signal.
具体地，提取数据信号的载波的频率值；由于通信信号是间断式接收的，提取通信信号的载波的频率时，对通信信号的强度有一定的要求，即信号幅度大于第一预设值的通信信号，将满足该条件的通信信号作为数据信号。Specifically, the frequency value of the carrier of the data signal is extracted; since the communication signal is received intermittently, when extracting the frequency of the carrier of the communication signal, there is a certain requirement for the strength of the communication signal, that is, the signal amplitude is greater than the first preset value. As for the communication signal, the communication signal satisfying the condition is used as the data signal.
提取数据信号的载波的频率值后，根据载波的频率值持续生成与载波同频率的辅助信号，并在近场通信设备之间的交互期间，持续将辅助信号发送给近场通信设备的解调模块，解调模块根据辅助信号对通信信号进行调解，这样，无论通信信号是否存续，解调模块均能持续接收到与载波同频率的辅助信号，解调模块无需提取通信信号的载波，在通信信号到来的同时就能实施解调，保证了数据传输的完整性。After extracting the frequency value of the carrier of the data signal, the auxiliary signal with the same frequency as the carrier is continuously generated according to the frequency value of the carrier, and during the interaction between the near-field communication devices, the auxiliary signal is continuously sent to the demodulation of the near-field communication device Module, the demodulation module mediates the communication signal according to the auxiliary signal. In this way, no matter whether the communication signal exists or not, the demodulation module can continuously receive the auxiliary signal with the same frequency as the carrier. The demodulation module does not need to extract the carrier of the communication signal. Demodulation can be implemented at the same time as the signal arrives, ensuring the integrity of data transmission.
本实施例通过提取数据信号的载波的频率值，根据载波的频率值，生成与载波同频率的辅助信号；将辅助信号发送至近场通信设备的解调模块，以供解调模块根据辅助信号对通信信号进行解调；从而在近场通信设备之间的一次交互期间，使近场通信设备的解调模块能持续接收到与载波同频率信号，并依据该信号进行解调，避免了目前的在解调过程中由于通信信号不连续而需要多次重复提取载波的情况，保证了数据传输的完整性。In this embodiment, by extracting the frequency value of the carrier of the data signal, an auxiliary signal with the same frequency as the carrier is generated according to the frequency value of the carrier; the auxiliary signal is sent to the demodulation module of the near-field communication device, so that the demodulation module can compare The communication signal is demodulated; thus, during an interaction between the near-field communication devices, the demodulation module of the near-field communication device can continuously receive the signal with the same frequency as the carrier, and demodulate according to the signal, avoiding the current In the demodulation process, due to the discontinuity of the communication signal, it is necessary to repeatedly extract the carrier wave, which ensures the integrity of the data transmission.
基于以上实施例，根据载波的频率值，生成与载波同频率的辅助信号之后，还包括：检测通信信号的信号幅度，判断通信信号的信号幅度是否小于第二预设值；相应地，将辅助信号发送至近场通信设备的解调模块，包括：在确定通信信号的信号幅度小于第二预设值后，将辅助信号发送至近场通信设备的解调模块。Based on the above embodiments, after generating the auxiliary signal with the same frequency as the carrier according to the frequency value of the carrier, it also includes: detecting the signal amplitude of the communication signal, and judging whether the signal amplitude of the communication signal is smaller than the second preset value; correspondingly, the auxiliary signal Sending the signal to the demodulation module of the near field communication device includes: sending the auxiliary signal to the demodulation module of the near field communication device after determining that the signal amplitude of the communication signal is smaller than the second preset value.
具体地，本实施例将通信信号的强度作为向解调模块发送辅助信号的一个条件，在一次交互中通信信号为连续时，则无须发送辅助信号，以节省能耗，仅在通信信号有中断的情况下，发送辅助信号；即检测通信信号的信号幅度，在确定通信信号的信号幅度小于第二预设值时，将辅助信号发送至解调模块。Specifically, in this embodiment, the strength of the communication signal is used as a condition for sending the auxiliary signal to the demodulation module. When the communication signal is continuous in an interaction, there is no need to send the auxiliary signal to save energy consumption. Only when the communication signal is interrupted In the case of , the auxiliary signal is sent; that is, the signal amplitude of the communication signal is detected, and when it is determined that the signal amplitude of the communication signal is smaller than the second preset value, the auxiliary signal is sent to the demodulation module.
最后说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it still can The technical solutions described in the foregoing embodiments are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.
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| CN201810205454.0ACN108449742B (en) | 2018-03-13 | 2018-03-13 | Auxiliary demodulation system and method for near field communication |
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| CN201810205454.0ACN108449742B (en) | 2018-03-13 | 2018-03-13 | Auxiliary demodulation system and method for near field communication |
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| CN201810205454.0AActiveCN108449742B (en) | 2018-03-13 | 2018-03-13 | Auxiliary demodulation system and method for near field communication |
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