公开(公告)号：US09520987B2

公开(公告)日：2016-12-13

申请号：US14628798

申请日：2015-02-23

Applicant: QUALCOMM Incorporated

Inventor： Eunmo Kang ,  Le Nguyen Luong ,  Koorosh Akhavan ,  Rajapaksa Senaratne ,  Thomas Cargill

IPC: H04L7/00 ,  H04B5/00 ,  H04L25/49 ,  H04B5/02 ,  H04L7/033 ,  H04L7/04

CPC classification number: H04L7/0016 ,  H04B5/0031 ,  H04B5/0056 ,  H04B5/0075 ,  H04B5/02 ,  H04L7/033 ,  H04L7/04 ,  H04L25/49

Abstract: A method for inductively-coupled communications is described. The method includes receiving a signal. The method also includes analyzing the signal to estimate a symbol timing error. Estimating the symbol timing error may include comparing a location of a pause, a low-to-high or a high-to-low transition in the received signal with an ideal location of a pause or a transition. The method further includes adjusting symbol timing to correct for the symbol timing error.

Abstract translation: 描述了一种用于电感耦合通信的方法。 该方法包括接收信号。 该方法还包括分析信号以估计符号定时误差。 估计符号定时误差可以包括将接收到的信号中的暂停位置，从低到高或从高到低的转变与暂停或转换的理想位置进行比较。 该方法还包括调整符号定时以校正符号定时误差。

公开(公告)号：US09287827B2

公开(公告)日：2016-03-15

申请号：US13786693

申请日：2013-03-06

Applicant: QUALCOMM Incorporated

Inventor： RaviKiran Gopalan ,  Koorosh Akhavan ,  Le Nguyen Luong

IPC: H04B5/00 ,  H03D3/00 ,  G06K7/10

CPC classification number: H03D3/00 ,  G06K7/10237 ,  H04B5/00 ,  H04B5/0025 ,  H04B5/0031 ,  H04B5/0056 ,  H04B5/0093

Abstract: A method includes demodulating a load modulated signal at an initiator device based at least partially on a phase adjusted comparison value corresponding to the load modulated signal.

Abstract translation: 一种方法包括至少部分地基于对应于负载调制信号的相位调整的比较值来解调起始器装置处的负载调制信号。

公开(公告)号：US20140086301A1

公开(公告)日：2014-03-27

申请号：US13800065

申请日：2013-03-13

Applicant: QUALCOMM INCORPORATED

Inventor： Koorosh Akhavan ,  Rainer Gaethke ,  Faramarz Sabouri

IPC: H04L1/00 ,  H04B5/00

CPC classification number: H04L1/0033 ,  H03F3/217 ,  H04B5/00 ,  H04B5/0031 ,  H04L25/03828 ,  H04L25/03853

Abstract: Systems and methods are disclosed that can shape signals to meet emission mask requirements, current consumption requirements, and overshoot/undershoot requirements relating to the interaction that, for example, occurs when a near field communications (NFC) target comes within range of an NFC initiator, and the initiator generates and transmits an NFC waveform. In some implementations, a pair of bit patterns are defined whose differential output from an amplifier is a shaped pulse width modulated waveform. Varying individual bits of the bit patterns can vary the shaped pulse waveform with predictability. The pulse width modulated waveform may be filtered using a matching network that reduces higher order harmonics, thereby reducing out-of-band emissions.

Abstract translation: 公开了可以形成信号以满足发射掩模要求，电流消耗要求以及与例如当近场通信（NFC）目标在NFC启动器的范围内发生时的相互作用的过冲/下冲要求的信号的系统和方法） 并且发起者生成并发送NFC波形。 在一些实现中，定义了一对位模式，其中来自放大器的差分输出是成形的脉冲宽度调制波形。 位模式的各个位的变化可以改变具有可预测性的形状脉冲波形。 可以使用减少更高阶谐波的匹配网络对脉宽调制波形进行滤波，从而减少带外发射。

公开(公告)号：US20140086292A1

公开(公告)日：2014-03-27

申请号：US13791737

申请日：2013-03-08

Applicant: QUALCOMM INCORPORATED

Inventor： Koorosh Akhavan ,  RaviKiran Gopalan ,  Eunmo Kang ,  Le Nguyen Luong

IPC: H04B5/00

CPC classification number: H04B5/00

Abstract: In a wireless near field communication (NFC) system, a target, such as a smart card, can communicate with an initiator, such as a card reader, by load modulating a radio frequency (RF) signal generated by the initiator. When two or more targets load modulate the RF signal generated, “collisions” can occur with the load modulation. Apparatus and methods detect the presence or absence of collisions in a lower layer or physical layer and report the presence of detected collisions to an upper layer for further handling.

Abstract translation: 在无线近场通信（NFC）系统中，诸如智能卡的目标可以通过负载调制由发起者产生的射频（RF）信号与诸如读卡器的发起者进行通信。 当两个或多个目标负载调制产生的RF信号时，负载调制可能会发生“碰撞”。 装置和方法检测下层或物理层中是否存在碰撞，并将检测到的碰撞的存在报告给上层进行进一步处理。

公开(公告)号：US20140062588A1

公开(公告)日：2014-03-06

申请号：US13786693

申请日：2013-03-06

Applicant: QUALCOMM INCORPORATED

Inventor： RaviKiran Gopalan ,  Koorosh Akhavan ,  Le Nguyen Luong

IPC: H03D3/00

CPC classification number: H03D3/00 ,  G06K7/10237 ,  H04B5/00 ,  H04B5/0025 ,  H04B5/0031 ,  H04B5/0056 ,  H04B5/0093

Abstract: A method includes demodulating a load modulated signal at an initiator device based at least partially on a phase adjusted comparison value corresponding to the load modulated signal.

Abstract translation: 一种方法包括至少部分地基于对应于负载调制信号的相位调整比较值来解调起始器装置处的负载调制信号。