公开(公告)号：US09729377B2

公开(公告)日：2017-08-08

申请号：US14787325

申请日：2014-05-16

Applicant: Optis Circuit Technology, LLC

Inventor： Achraf Dhayni

IPC: H04L27/26

CPC classification number: H04L27/2663 ,  H04L27/2666

Abstract: A method for determining a symbol boundary in a data packet belonging to a received OFDM signal is provided. The data packet includes a first training filed and a second training field, which begins with a guard interval. The method includes detecting the beginning of the data packet, and starting an automatic gain control process. The method further includes, after the automatic gain control process is locked, determining autocorrelation peaks and estimating the symbol boundary from times of the autocorrelation peaks.

公开(公告)号：US09632896B2

公开(公告)日：2017-04-25

申请号：US14273650

申请日：2014-05-09

Applicant: Optis Circuit Technology, LLC

Inventor： Achraf Dhayni

IPC: H04B17/00 ,  G06F11/27 ,  H04B5/00 ,  H04B17/17 ,  H04B17/19

CPC classification number: G06F11/27 ,  H04B5/0062 ,  H04B17/00 ,  H04B17/17 ,  H04B17/19

Abstract: A built-in self-testing method of a near field communication device including several functions tests a first internal communication link between a first function and a second function. The testing is performed by sending, on said first internal communication link, a first command from said first function used as a transmitter to said second function used as a receiver, and by checking said first command has been correctly executed by said second function.

公开(公告)号：US09847901B2

公开(公告)日：2017-12-19

申请号：US14767960

申请日：2013-11-25

Applicant: Optis Circuit Technology, LLC

Inventor： Achraf Dhayni

IPC: H04L27/26

CPC classification number: H04L27/266 ,  H04L27/265

Abstract: A method and an apparatus determine a time of start of series of OFDM symbols forming an OFDM packet, wherein one or more symbols of the OFDM signal includes a plurality of copies of a short training sequence made of a plurality of time-domain samples. The method includes determining a coarse time index, determining a fine time index, and determining the time of start of each OFDM symbols based on the fine time index. The coarse time-domain sample of the coarse time index is within a coarse estimation error interval, and the time-domain samples of the coarse estimation error interval are converted into frequency domain samples. A metric value is determined for each frequency domain samples, and the fine time index is the time index corresponding to one of the coarse estimation error interval having its associated frequency domain sample having the lowest metric value.

公开(公告)号：US09729209B2

公开(公告)日：2017-08-08

申请号：US14438733

申请日：2013-11-20

Applicant: Optis Circuit Technology, LLC

Inventor： Achraf Dhayni

IPC: H04Q5/22 ,  H04B5/00 ,  G06K7/10

CPC classification number: H04B5/0062 ,  G06K7/10128 ,  G06K7/10237 ,  G06K7/10297

Abstract: A Near Field Communication method performed by a tag reader detects whether a tag is present. The method includes stimulating the tag reader's transmitter to generate an impulse response, evaluating the impulse response generated by the transmitter to obtain an evaluated impulse response, and assessing whether a tag is present based on the evaluated impulse response.