WO2013037174A1 - 一种终端nfc匹配的自适应方法和装置 - Google Patents

一种终端nfc匹配的自适应方法和装置 Download PDF

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Publication number
WO2013037174A1
WO2013037174A1 PCT/CN2011/083950 CN2011083950W WO2013037174A1 WO 2013037174 A1 WO2013037174 A1 WO 2013037174A1 CN 2011083950 W CN2011083950 W CN 2011083950W WO 2013037174 A1 WO2013037174 A1 WO 2013037174A1
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Prior art keywords
nfc
matching circuit
signal strength
information
matching
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PCT/CN2011/083950
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English (en)
French (fr)
Inventor
刘双霖
张宇
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中兴通讯股份有限公司
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Publication of WO2013037174A1 publication Critical patent/WO2013037174A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/18Self-organising networks, e.g. ad-hoc networks or sensor networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/14Direct-mode setup

Definitions

  • the present invention relates to near field communication (NFC) functions of terminals, and more particularly to an adaptive method and apparatus for terminal NFC matching.
  • NFC near field communication
  • NFC Mobile payment has slowly entered people's lives. As long as there is a mobile phone with NFC function, it can replace the bus card, bank card and credit card that you need to use. NFC can solve all the problems. NFC now has two main standards, 2.5GHz and 13.56MHz. 2.5GHz is mainly used in the financial sector, while 13.56MHz is mostly used in closed environments, such as bus cards, meal cards, and so on. Currently, the operator is pushing the 13.56MHz solution. The solution integrates the NFC function into the SIM (Subscriber Identity Module) card. The mobile phone only needs to provide an NFC antenna to complete the function of the card. This design can effectively reduce the design complexity of NFC and facilitate the promotion of technology.
  • SIM Subscriber Identity Module
  • the main object of the present invention is to provide an adaptive method and apparatus for terminal NFC matching, so that the terminal obtains an optimal NFC communication state.
  • the present invention provides an adaptive method for terminal NFC matching, the method comprising: setting a matching circuit for changing an impedance of an NFC radio frequency path at a terminal;
  • the terminal records the initial matching circuit information and the NFC signal strength. After each adjustment of the matching circuit, the terminal detects the current NFC signal strength of the NFC antenna, and records the matching circuit information and the NFC signal strength with the strongest NFC signal strength;
  • the matching circuit is set based on the recorded matching circuit information.
  • the matching circuit for changing the impedance of the NFC RF path includes: a switch, an inductor, and a capacitor, wherein the inductor and the capacitor form a matching circuit through series and parallel, and the switch is used to adjust the matching circuit and change the impedance of the NFC RF path.
  • the terminal After the adjustment of the matching circuit, the terminal detects the current NFC signal strength of the NFC antenna, and records the matching circuit information and the NFC signal strength with the strongest NFC signal strength as:
  • the terminal adjusts a matching circuit for changing the impedance of the NFC RF path, and after each adjustment of the matching circuit, detects the current NFC signal strength of the NFC antenna, and compares the current NFC signal strength with the recorded NFC signal strength, the current When the NFC signal strength is stronger than the recorded NFC signal strength, the recorded matching circuit information and the NFC signal are replaced with the current matching circuit information and the NFC signal strength in the recording, otherwise the next adjustment is performed until all the adjustment ends.
  • the matching circuit information is switch state information of the matching circuit.
  • the detecting the current NFC signal strength of the NFC antenna is: the terminal filters the RF signal currently coupled from the NFC antenna through a 13.56 MHz band pass filter, and the filtered signal passes through the discriminator to output an analog signal, The analog signal is sampled by an analog-to-digital converter (ADC) to obtain the NFC signal strength.
  • ADC analog-to-digital converter
  • the method further includes: after the all adjustment ends, the recorded matching circuit information is corresponding to the customer identification module (SIM) card information; after the terminal enters the NFC credit card state, the SIM card information is read, Finding whether to save the information with the SIM card Corresponding matching circuit information, when found, directly sets a matching circuit according to the corresponding matching circuit information.
  • SIM customer identification module
  • the invention provides an adaptive device for terminal NFC matching, the device is provided with a matching circuit for changing the impedance of the NFC radio frequency path, and the device further comprises: an NFC matching control module, an NFC signal strength detecting module, an access module, and an NFC antenna. ; among them,
  • the NFC matching control module is configured to adjust the matching circuit, notify the NFC signal strength detecting module to detect the current NFC signal strength of the NFC antenna, and send the matching circuit information with the strongest NFC signal strength and the NFC signal strength to the access module; After the adjustment is completed, the matching circuit is set according to the matching circuit information recorded in the access module;
  • the NFC signal strength detecting module is configured to detect the NFC signal strength of the initial matching circuit, and detect the current NFC signal strength of the NFC antenna according to the notification of the NFC matching control module, and send the NFC signal strength to the NFC matching control module;
  • NFC antenna for receiving and transmitting NFC signals.
  • the NFC matching control module is further configured to notify the access module after all adjustments are completed;
  • the access module is further configured to: after receiving the notification that all adjustments of the NFC matching control module are completed, perform the corresponding information of the recorded matching circuit and the SIM card information, and save.
  • the NFC matching control module is further configured to notify the access module to read the SIM card information after the terminal enters the NFC card swiping state, and save the matching corresponding to the SIM card information in the received access module. After the notification of the circuit information, the matching circuit is directly set according to the corresponding matching circuit information recorded in the access module;
  • the access module is further configured to read the SIM card information, and notify the NFC matching control module when it finds that the matching circuit information corresponding to the SIM card information is saved.
  • the invention provides an adaptive method and device for terminal NFC matching, which is used in terminal setting.
  • the matching circuit for changing the impedance of the NFC RF path the terminal records the initial matching circuit information and the NFC signal strength.
  • the terminal After each adjustment of the matching circuit for changing the impedance of the NFC RF path, the terminal detects the current NFC signal strength of the NFC antenna, and records the NFC.
  • the NFC communication status satisfies the user's experience.
  • FIG. 1 is a schematic flowchart of an adaptive method for implementing NFC matching of a terminal according to the present invention
  • FIG. 2 is a schematic diagram of a matching circuit for changing impedance of an NFC radio frequency path according to the present invention
  • FIG. 3 is a schematic diagram of a terminal NFC matching according to the present invention
  • Schematic diagram of the adaptive device
  • the basic idea of the present invention is: setting a matching circuit for changing the impedance of the NFC RF path at the terminal; the terminal records the initial matching circuit information and the NFC signal strength, and each time adjusting the matching circuit for changing the impedance of the NFC RF path, the terminal The current NFC signal strength of the NFC antenna is detected, the matching circuit information with the strongest NFC signal strength and the NFC signal strength are recorded; after all adjustments are completed, the matching circuit is set according to the recorded matching circuit information.
  • the present invention implements an adaptive method for terminal NFC matching. As shown in FIG. 1, the method includes the following steps:
  • Step 101 setting a matching circuit for changing an impedance of the NFC RF path at the terminal;
  • the matching circuit for changing the impedance of the NFC RF path is generally composed of a switch, an inductor, and a capacitor, wherein the inductor and the capacitor form a matching circuit through serial and parallel connection.
  • the switch is used to adjust the matching circuit to change the impedance of the NFC RF path.
  • An example provided by the present invention is shown in FIG. 2.
  • the matching circuit for changing the impedance of the NFC RF path is composed of switches SW1 - SW12 and L1.
  • Step 102 The terminal records the initial matching circuit information and the NFC signal strength. After each adjustment circuit for changing the impedance of the NFC RF path, the terminal detects the current NFC signal strength of the NFC antenna, and records the matching circuit with the strongest NFC signal strength. Information and NFC signal strength; Specifically, after entering the NFC card state, the terminal detects the current NFC signal strength of the NFC antenna, records the initial matching circuit information and the NFC signal strength, and then the terminal adjusts the matching for changing the impedance of the NFC RF path.
  • the detecting the current NFC signal strength of the NFC antenna is generally: the terminal filters the RF signal currently coupled from the NFC antenna through a 13.56 MHz band pass filter, and the filtered signal passes through the discriminator to output an analog signal, and the analog signal is The NFC signal strength is obtained by analog-to-digital converter (ADC) sampling.
  • ADC analog-to-digital converter
  • Step 103 After all the adjustments are completed, the matching circuit is set according to the recorded matching circuit information; specifically, after all the adjustments are completed, the matching circuit is adjusted according to the switching state of the recorded matching circuit.
  • This step further includes, after all adjustments are completed, the recorded matching circuit information and the SIM Card information is carried out - corresponding;
  • the method further includes: after the terminal enters the NFC card swiping state, reading the SIM card information, searching for whether the matching circuit information corresponding to the SIM card information is saved, and directly searching according to the corresponding The matching circuit information sets the matching circuit, and does not perform step 102; when not found, the terminal starts to perform step 102.
  • the present invention further provides an adaptive device for terminal NFC matching.
  • the device is provided with a matching circuit 31 for changing the impedance of the NFC radio frequency path, and the device further includes: an NFC matching control module 32. , NFC signal strength detecting module 33, access module 34, NFC antenna 35;
  • the NFC matching control module 32 is configured to adjust the matching circuit 31, notify the NFC signal strength detecting module to detect the current NFC signal strength of the NFC antenna, and send the matching circuit information and the NFC signal strength with the strongest NFC signal strength to the access module 34. After all adjustments are completed, the matching circuit 31 is set according to the matching circuit information recorded in the access module 34;
  • the NFC signal strength detecting module 33 is configured to detect the NFC signal strength of the initial matching circuit 31, and detect the current NFC signal strength of the NFC antenna 35 according to the notification of the NFC matching control module 32, and send the NFC signal strength to the NFC matching control module 32. ;
  • An access module 34 configured to record matching circuit information and NFC signal strength
  • An NFC antenna 35 for receiving and transmitting an NFC signal
  • the matching circuit 31 for changing the impedance of the NFC RF path is generally composed of a switch, an inductor and a capacitor, wherein the inductor and the capacitor form a matching circuit through a series connection, and the switch is used to adjust the matching circuit to change the impedance of the NFC RF path;
  • the NFC matching control module 32 is further configured to notify the access module 34 after all adjustments are completed;
  • the access module 34 is further configured to: after receiving the notification that all adjustments of the NFC matching control module 32 are completed, perform the corresponding matching circuit information and the SIM card information, and ensure Save
  • the NFC matching control module 32 is further configured to notify the access module 34 to read the SIM card information after the terminal enters the NFC card-swapping state, and store the matching circuit corresponding to the SIM card information in the access module 34. After the notification of the information, the matching circuit 31 is directly set according to the corresponding matching circuit information recorded in the access module 34;
  • the access module 34 is further configured to read the SIM card information, search for whether the matching circuit information corresponding to the SIM card information is saved, and notify the NFC matching control module 32 when the search is found.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transceivers (AREA)

Abstract

本发明公开了一种终端近场通信(NFC)匹配的自适应方法,在终端设置用于改变NFC射频通路阻抗的匹配电路;终端记录初始的匹配电路信息及NFC信号强度,在每次调节用于改变NFC射频通路阻抗的匹配电路后,终端检测NFC天线当前的NFC信号强度,记录NFC信号强度最强的匹配电路信息及NFC信号强度;在全部调节结束后,根据记录的匹配电路信息设置匹配电路;本发明同时还公开了一种终端NFC匹配的自适应装置;通过本发明的方案,能够根据当前NFC通信的状态选择最佳的匹配电路使终端获得最佳的NFC通信状态,满足用户的使用感受。

Description

一种终端 NFC匹配的自适应方法和装置 技术领域
本发明涉及终端的近场通信(NFC )功能, 尤其涉及一种终端 NFC匹 配的自适应方法和装置。 背景技术
如今手机支付已经慢慢的进入了人们的生活。 只要有一个带有 NFC功 能的手机, 就能够代替平常出行需要使用的公交卡、银行卡、信用卡, NFC 可以解决一切的难题。 现在 NFC主要有两种标准, 2.5GHz和 13.56MHz。 2.5GHz主要用于金融领域, 而 13.56MHz多用于封闭的环境中, 如公交卡、 饭卡等等。 运营商目前主推的是 13.56MHz的方案, 该方案将 NFC功能集 成在客户识别模块( SIM, Subscriber Identity Module )卡中, 手机只需要提 供 NFC的天线便可以完成刷卡的功能。这样设计可以有效的降低 NFC的设 计复杂度, 方便技术的推广。 但是由于 NFC功能由 SIM卡集成, 而不同的 SIM 卡生产商所生产的卡, 输出端口的阻抗都不同, 这就要求手机必须对 不同 SIM卡厂商的卡设计不同的匹配电路, 以, 这显然是不现实的。 目前 业界对于该问题还没有较好的解决方案, 唯一的办法就是将天线的频率调 整的足够宽, 以期兼容不同 SIM卡商的卡, 但是这种调整是以牺牲 NFC通 信效果来实现的, 影响用户的使用感受。 发明内容
有鉴于此, 本发明的主要目的在于提供一种终端 NFC匹配的自适应方 法和装置, 使终端获得最佳的 NFC通信状态。
为达到上述目的, 本发明的技术方案是这样实现的: 本发明提供的一种终端 NFC匹配的自适应方法, 该方法包括: 在终端设置用于改变 NFC射频通路阻抗的匹配电路;
终端记录初始的匹配电路信息及 NFC信号强度, 在每次调节所述匹配 电路后, 终端检测 NFC天线当前的 NFC信号强度, 记录 NFC信号强度最 强的匹配电路信息及 NFC信号强度;
在全部调节结束后, 根据记录的匹配电路信息设置匹配电路。
上述方案中,所述用于改变 NFC射频通路阻抗的匹配电路包括:开关、 电感和电容, 其中, 电感和电容通过串、 并联构成匹配电路, 开关用于调 节匹配电路, 改变 NFC射频通路的阻抗。
上述方案中, 所述在每次调节所述匹配电路后, 终端检测 NFC天线当 前的 NFC信号强度, 记录 NFC信号强度最强的匹配电路信息及 NFC信号 强度为:
终端调节用于改变 NFC射频通路阻抗的匹配电路, 并在每次调节所述 匹配电路后, 检测 NFC天线当前的 NFC信号强度, 将当前的 NFC信号强 度与记录的 NFC信号强度进行比较, 当前的 NFC信号强度比记录的 NFC 信号强度强时, 在记录中用当前的匹配电路信息及 NFC信号强度替换记录 的匹配电路信息及 NFC信号, 否则进行下一次调节, 直到全部调节结束。
上述方案中, 所述匹配电路信息为所述匹配电路的开关状态信息。 上述方案中,所述检测 NFC天线当前的 NFC信号强度为:终端将当前 从 NFC天线耦合过来的射频信号通过 13.56MHz的带通滤波器滤波, 滤波 后的信号经过鉴频器输出模拟信号, 将模拟信号通过模数转换器(ADC ) 采样获得 NFC信号强度。
上述方案中, 该方法进一步包括: 在全部调节结束后, 将记录的匹配 电路信息与客户识别模块(SIM )卡信息进行——对应; 在终端进入 NFC 刷卡状态后, 读取 SIM卡信息, 在自身查找是否保存有与所述 SIM卡信息 对应的匹配电路信息, 在查找到时, 直接根据所述对应的匹配电路信息设 置匹配电路。
本发明提供的一种终端 NFC匹配的自适应装置, 该装置设置有用于改 变 NFC射频通路阻抗的匹配电路,该装置还包括: NFC匹配控制模块、 NFC 信号强度检测模块、 存取模块、 NFC天线; 其中,
NFC匹配控制模块, 用于调节所述匹配电路, 通知 NFC信号强度检测 模块检测 NFC天线当前的 NFC信号强度, 将 NFC信号强度最强的匹配电 路信息及 NFC信号强度发送到存取模块; 在全部调节结束后, 根据存取模 块中记录的匹配电路信息设置匹配电路;
NFC信号强度检测模块, 用于检测初始匹配电路的 NFC信号强度, 以 及根据 NFC匹配控制模块的通知检测 NFC天线当前的 NFC信号强度, 并 将 NFC信号强度发送到 NFC匹配控制模块;
存取模块, 用于记录匹配电路信息及 NFC信号强度;
NFC天线, 用于接收和发送 NFC信号。
上述方案中,所述 NFC匹配控制模块,进一步用于在全部调节结束后, 通知存取模块;
所述存取模块, 进一步用于收到 NFC匹配控制模块的全部调节结束的 通知后, 将记录的匹配电路信息与 SIM卡信息进行——对应, 并保存。
上述方案中, 所述 NFC匹配控制模块, 进一步还用于在终端进入 NFC 刷卡状态后, 通知存取模块读取 SIM卡信息, 并在收到存取模块的保存有 与 SIM卡信息对应的匹配电路信息的通知后, 直接根据存取模块中记录的 所述对应的匹配电路信息设置匹配电路;
所述所述存取模块, 进一步还用于读取 SIM卡信息, 在自身查找到保 存有与所述 SIM卡信息对应的匹配电路信息时, 通知 NFC匹配控制模块。
本发明提供了一种终端 NFC匹配的自适应方法和装置, 在终端设置用 于改变 NFC射频通路阻抗的匹配电路; 终端记录初始的匹配电路信息及 NFC信号强度, 在每次调节用于改变 NFC射频通路阻抗的匹配电路后, 终 端检测 NFC天线当前的 NFC信号强度, 记录 NFC信号强度最强的匹配电 路信息及 NFC信号强度; 在全部调节结束后, 根据记录的匹配电路信息设 置匹配电路; 如此, 能够根据当前 NFC通信的状态选择最佳的匹配电路使 终端获得最佳的 NFC通信状态, 满足用户的使用感受。 附图说明
图 1为本发明实现一种终端 NFC匹配的自适应方法的流程示意图; 图 2为本发明所述用于改变 NFC射频通路阻抗的匹配电路的示意图; 图 3为本发明实现一种终端 NFC匹配的自适应装置的结构示意图。 具体实施方式
本发明的基本思想是: 在终端设置用于改变 NFC射频通路阻抗的匹配 电路; 终端记录初始的匹配电路信息及 NFC信号强度, 在每次调节用于改 变 NFC射频通路阻抗的匹配电路后, 终端检测 NFC天线当前的 NFC信号 强度,记录 NFC信号强度最强的匹配电路信息及 NFC信号强度;在全部调 节结束后, 根据记录的匹配电路信息设置匹配电路。
下面通过附图及具体实施例对本发明做进一步的详细说明。
本发明实现一种终端 NFC匹配的自适应方法, 如图 1所示, 该方法包 括以下几个步驟:
步驟 101: 在终端设置用于改变 NFC射频通路阻抗的匹配电路; 所述用于改变 NFC射频通路阻抗的匹配电路一般由开关、 电感和电容 组成, 其中, 电感和电容通过串、 并联构成匹配电路, 开关用于调节匹配 电路, 改变 NFC射频通路的阻抗; 本发明提供的一个实例如图 2所示, 所 述用于改变 NFC射频通路阻抗的匹配电路由开关 SW1— SW12、 电感 L1一 电感 L6和电容 C1—C6构成, 其中在 SW1、 SW2、 SW3、 SW4均闭合时 为第一种匹配电路; 再将 SW5、 SW6、 SW7、 SW8也闭合时为第二种匹配 电路; 最后将 SW9、 SW10、 SW11、 SW12也闭合时为第三种匹配电路; 可以看出, 通过改变开关的状态可以使这三种匹配电路的阻抗各不相同, 即可以改变 NFC射频通路的阻抗。
步驟 102: 终端记录初始的匹配电路信息及 NFC信号强度, 在每次调 节用于改变 NFC射频通路阻抗的匹配电路后, 终端检测 NFC天线当前的 NFC信号强度,记录 NFC信号强度最强的匹配电路信息及 NFC信号强度; 具体的, 终端在进入 NFC刷卡状态后, 检测 NFC天线当前的 NFC信 号强度, 记录初始的匹配电路信息及 NFC信号强度, 之后, 终端调节用于 改变 NFC射频通路阻抗的匹配电路,并在每次调节用于改变 NFC射频通路 阻抗的匹配电路后, 检测 NFC天线当前的 NFC信号强度, 将当前的 NFC 信号强度与记录的 NFC信号强度进行比较,当前的 NFC信号强度比记录的 NFC信号强度强时,在记录中用当前的匹配电路信息及 NFC信号强度替换 记录的匹配电路信息及 NFC信号, 否则进行下一次调节, 直到全部调节结 束,所述记录中记录了 NFC信号强度最强的匹配电路信息及 NFC信号强度; 所述匹配电路信息为所述匹配电路的开关状态信息;
所述检测 NFC天线当前的 NFC信号强度,一般是,终端将当前从 NFC 天线耦合过来的射频信号通过 13.56MHz的带通滤波器滤波,滤波后的信号 经过鉴频器输出模拟信号, 将模拟信号通过模数转换器(ADC )采样获得 NFC信号强度。
步驟 103:在全部调节结束后,根据记录的匹配电路信息设置匹配电路; 具体的, 在全部调节结束后, 根据记录的匹配电路的开关状态调节匹 配电路。
本步驟进一步包括,在全部调节结束后,将记录的匹配电路信息与 SIM 卡信息进行——对应;
进一步的, 该方法还包括: 在终端进入 NFC刷卡状态后, 读取 SIM卡 信息, 在自身查找是否保存有与所述 SIM卡信息对应的匹配电路信息, 在 查找到时, 直接根据所述对应的匹配电路信息设置匹配电路, 并不执行步 驟 102; 在没有查找到时, 终端开始执行步驟 102。
为了实现上述方法, 本发明还提供一种终端 NFC匹配的自适应装置, 如图 3所示, 该装置设置有用于改变 NFC射频通路阻抗的匹配电路 31 , 该 装置还包括: NFC匹配控制模块 32、 NFC信号强度检测模块 33、存取模块 34、 NFC天线 35; 其中,
NFC匹配控制模块 32, 用于调节所述匹配电路 31 , 通知 NFC信号强 度检测模块检测 NFC天线当前的 NFC信号强度, 将 NFC信号强度最强的 匹配电路信息及 NFC信号强度发送到存取模块 34; 在全部调节结束后, 根 据存取模块 34中记录的匹配电路信息设置匹配电路 31;
NFC信号强度检测模块 33, 用于检测初始匹配电路 31的 NFC信号强 度, 以及根据 NFC匹配控制模块 32的通知检测 NFC天线 35当前的 NFC 信号强度, 并将 NFC信号强度发送到 NFC匹配控制模块 32;
存取模块 34, 用于记录匹配电路信息及 NFC信号强度;
NFC天线 35 , 用于接收和发送 NFC信号;
所述用于改变 NFC射频通路阻抗的匹配电路 31—般由开关、 电感和 电容组成, 其中, 电感和电容通过串、 并联构成匹配电路, 开关用于调节 匹配电路, 改变 NFC射频通路的阻抗;
所述 NFC匹配控制模块 32, 进一步用于在全部调节结束后, 通知存取 模块 34;
所述存取模块 34, 进一步用于收到 NFC匹配控制模块 32的全部调节 结束的通知后, 将记录的匹配电路信息与 SIM卡信息进行——对应, 并保 存;
所述 NFC匹配控制模块 32, 进一步还用于在终端进入 NFC刷卡状态 后, 通知存取模块 34读取 SIM卡信息, 并在收到存取模块 34的保存有与 SIM卡信息对应的匹配电路信息的通知后, 直接根据存取模块 34中记录的 所述对应的匹配电路信息设置匹配电路 31;
所述所述存取模块 34, 进一步还用于读取 SIM卡信息, 在自身查找是 否保存有与所述 SIM卡信息对应的匹配电路信息, 在查找到时, 通知 NFC 匹配控制模块 32。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种终端近场通信(NFC ) 匹配的自适应方法, 其特征在于, 该方 法包括:
在终端设置用于改变 NFC射频通路阻抗的匹配电路;
终端记录初始的匹配电路信息及 NFC信号强度, 在每次调节所述匹配 电路后, 终端检测 NFC天线当前的 NFC信号强度, 记录 NFC信号强度最 强的匹配电路信息及 NFC信号强度;
在全部调节结束后, 根据记录的匹配电路信息设置匹配电路。
2、 根据权利要求 1 所述的自适应方法, 其特征在于, 所述用于改变 NFC射频通路阻抗的匹配电路包括: 开关、 电感和电容, 其中, 电感和电 容通过串、 并联构成匹配电路, 开关用于调节匹配电路, 改变 NFC射频通 路的阻抗。
3、 根据权利要求 2所述的自适应方法, 其特征在于, 所述在每次调节 所述匹配电路后, 终端检测 NFC天线当前的 NFC信号强度, 记录 NFC信 号强度最强的匹配电路信息及 NFC信号强度为:
终端调节用于改变 NFC射频通路阻抗的匹配电路, 并在每次调节所述 匹配电路后, 检测 NFC天线当前的 NFC信号强度, 将当前的 NFC信号强 度与记录的 NFC信号强度进行比较, 当前的 NFC信号强度比记录的 NFC 信号强度强时, 在记录中用当前的匹配电路信息及 NFC信号强度替换记录 的匹配电路信息及 NFC信号, 否则进行下一次调节, 直到全部调节结束。
4、 根据权利要求 3所述的自适应方法, 其特征在于, 所述匹配电路信 息为所述匹配电路的开关状态信息。
5、 根据权利要求 4所述的自适应方法, 其特征在于, 所述检测 NFC 天线当前的 NFC信号强度为:终端将当前从 NFC天线耦合过来的射频信号 通过 13.56MHz 的带通滤波器滤波, 滤波后的信号经过鉴频器输出模拟信 号, 将模拟信号通过模数转换器(ADC )采样获得 NFC信号强度。
6、 根据权利要求 1所述的自适应方法, 其特征在于, 该方法进一步包 括: 在全部调节结束后, 将记录的匹配电路信息与客户识别模块(SIM )卡 信息进行——对应; 在终端进入 NFC刷卡状态后, 读取 SIM卡信息, 在自 身查找是否保存有与所述 SIM卡信息对应的匹配电路信息, 在查找到时, 直接根据所述对应的匹配电路信息设置匹配电路。
7、 一种终端 NFC 匹配的自适应装置, 其特征在于, 该装置设置有用 于改变 NFC射频通路阻抗的匹配电路,该装置还包括: NFC匹配控制模块、 NFC信号强度检测模块、 存取模块、 NFC天线; 其中,
NFC匹配控制模块, 用于调节所述匹配电路, 通知 NFC信号强度检测 模块检测 NFC天线当前的 NFC信号强度, 将 NFC信号强度最强的匹配电 路信息及 NFC信号强度发送到存取模块; 在全部调节结束后, 根据存取模 块中记录的匹配电路信息设置匹配电路;
NFC信号强度检测模块, 用于检测初始匹配电路的 NFC信号强度, 以 及根据 NFC匹配控制模块的通知检测 NFC天线当前的 NFC信号强度, 并 将 NFC信号强度发送到 NFC匹配控制模块;
存取模块, 用于记录匹配电路信息及 NFC信号强度;
NFC天线, 用于接收和发送 NFC信号。
8、 根据权利要求 7所述的自适应装置, 其特征在于, 所述 NFC 匹配 控制模块, 进一步用于在全部调节结束后, 通知存取模块;
所述存取模块, 进一步用于收到 NFC匹配控制模块的全部调节结束的 通知后, 将记录的匹配电路信息与 SIM卡信息进行——对应, 并保存。
9、 根据权利要求 8所述的自适应装置, 其特征在于, 所述 NFC 匹配 控制模块, 进一步还用于在终端进入 NFC刷卡状态后, 通知存取模块读取 SIM卡信息, 并在收到存取模块的保存有与 SIM卡信息对应的匹配电路信 息的通知后, 直接根据存取模块中记录的所述对应的匹配电路信息设置匹 配电路;
所述所述存取模块, 进一步还用于读取 SIM卡信息, 在自身查找到保 存有与所述 SIM卡信息对应的匹配电路信息时, 通知 NFC匹配控制模块。
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