公开(公告)号：US08723553B1

公开(公告)日：2014-05-13

申请号：US13773784

申请日：2013-02-22

Applicant: QUALCOMM Incorporated

Inventor： RaviKiran Gopalan

IPC: G01R23/02 ,  H04L27/26

CPC classification number: G01R23/02 ,  H04L27/0014 ,  H04L27/2675

Abstract: A method for determining an effective frequency offset by circuitry is described. The method includes determining a first frequency offset average over a first half of a syncword. The method also includes determining a second frequency offset average over the entire syncword. The method further includes determining a third frequency offset average over a second half of the syncword. The method additionally includes determining an effective frequency offset at an end of the syncword based on the first frequency offset average, the second frequency offset average and the third frequency offset average.

Abstract translation: 描述了一种通过电路确定有效频率偏移的方法。 该方法包括确定同步字的前半部分上的第一频率偏移平均值。 该方法还包括确定整个同步字的第二频偏平均值。 该方法还包括在同步字的后半部分确定第三频偏平均值。 该方法还包括基于第一频率偏移平均值，第二频率偏移平均值和第三频率偏移平均值来确定同步字的结尾处的有效频率偏移。

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。