公开(公告)号：US09071926B2

公开(公告)日：2015-06-30

申请号：US13657751

申请日：2012-10-22

Applicant: Qualcomm Incorporated

Inventor： Koushik Krishnan ,  Rainer Gaethke

IPC: H04W4/00 ,  G06K7/10 ,  H04B5/00 ,  H04B5/02 ,  H04M1/725

CPC classification number: H04W4/80 ,  G06K7/10128 ,  G06K7/10237 ,  H04B5/0031 ,  H04B5/0075 ,  H04B5/02 ,  H04M1/7253 ,  H04M2250/04

Abstract: First and second NFC devices both seek to determine whether the other device is present and available for communication across an NFC channel. The first NFC device modulates a load in its transceiver. The second NFC device transmits a waveform. If the first NFC device detects the waveform while modulating its load, and if the second NFC device detects the load modulation while transmitting the waveform, then the two NFC devices initiate communication in accordance with a communication protocol.

Abstract translation: 第一和第二NFC设备都试图确定其他设备是否存在并且可用于跨越NFC信道的通信。 第一个NFC设备调制其收发器中的负载。 第二个NFC设备发送一个波形。 如果第一NFC设备在调节其负载的同时检测波形，并且如果第二NFC设备在发送波形时检测到负载调制，则两个NFC设备根据通信协议发起通信。

公开(公告)号：US08977197B2

公开(公告)日：2015-03-10

申请号：US13649801

申请日：2012-10-11

Applicant: QUALCOMM Incorporated

Inventor： Koushik Krishnan ,  Rainer Gaethke ,  Faramarz Sabouri

IPC: H04B5/00 ,  H04B7/00 ,  G06K7/00 ,  G06K7/10

CPC classification number: G06K7/0008 ,  G06K7/10128 ,  H04B5/0031 ,  H04B5/0075 ,  H04B17/12

Abstract: A near-field communications (NFC) device includes an NFC antenna, a matching network coupled to the NFC antenna, and a transmitter coupled to the matching network. The transmitter applies a signal to the matching network and a capacitance of the matching network is varied. A parameter is measured while varying the capacitance of the matching network and while applying the signal. A peak value of the parameter is identified and compared to a threshold. A communication protocol is initiated in response to a determination that the peak value satisfies the threshold.

Abstract translation: 近场通信（NFC）设备包括NFC天线，耦合到NFC天线的匹配网络和耦合到匹配网络的发射机。 发射机向匹配网络施加信号，匹配网络的电容变化。 在改变匹配网络的电容和应用信号的同时测量参数。 识别参数的峰值并将其与阈值进行比较。 响应于峰值满足阈值的确定来启动通信协议。

公开(公告)号：US09124302B2

公开(公告)日：2015-09-01

申请号：US13650031

申请日：2012-10-11

Applicant: Qualcomm Incorporated

Inventor： Koushik Krishnan ,  Rainer Gaethke ,  Faramarz Sabouri

IPC: H04B5/00 ,  H04B17/11

CPC classification number: H04B5/00 ,  H04B5/0056 ,  H04B17/11

Abstract: A near-field communications (NFC) device includes an NFC antenna, a matching network coupled to the NFC antenna, and a transmitter coupled to the matching network. The transmitter applies a signal to the matching network and varies a frequency of the signal. A parameter is measured while varying the frequency of the signal. A peak value of the parameter is identified and compared to a threshold. A communication protocol is initiated in response to a determination that the peak value satisfies the threshold.

Abstract translation: 近场通信（NFC）设备包括NFC天线，耦合到NFC天线的匹配网络和耦合到匹配网络的发射机。 发射机向匹配网络施加信号并改变信号的频率。 在改变信号的频率的同时测量参数。 识别参数的峰值并将其与阈值进行比较。 响应于峰值满足阈值的确定来启动通信协议。