公开(公告)号：US20190044770A1

公开(公告)日：2019-02-07

申请号：US16156155

申请日：2018-10-10

Applicant: STMicroelectronics razvoj polprevodnikov d.o.o.

Inventor： Maksimiljan Stiglic ,  Kosta Kovacic

IPC: H04L27/20 ,  H04L27/04 ,  H04L27/36

Abstract: A method of wireless communication includes transmitting frames from a transponder to a reader and synchronizing between a reader carrier frequency and an active load modulation (ALM) carrier frequency within each transmitted frame. Each transmitted frame includes ALM carrier bursts generated from subcarrier modulation by binary phase shift keying (BPSK) data encoding and producing signal oscillations at a transponder antenna after each ALM carrier burst generation, The synchronizing occurs at each phase change of the data encoding when no burst is generated during a half period of the subcarrier preceding the phase change and a half period of the subcarrier following this phase change. The transponder antenna has a moderate quality factor sufficient to naturally damp the signal oscillations so that the synchronizing is performed without performing any controlled signal oscillations damping.

公开(公告)号：US20180324012A1

公开(公告)日：2018-11-08

申请号：US15966948

申请日：2018-04-30

Applicant: STMicroelectronics razvoj polprevodnikov d.o.o.

Inventor： Maksimiljan Stiglic ,  Kosta Kovacic

IPC: H04L27/20 ,  H04L27/04 ,  H04L27/36

CPC classification number: H04L27/2071 ,  G06K19/0723 ,  H04B5/0056 ,  H04L27/04 ,  H04L27/361

Abstract: A method of wireless communication includes transmitting frames from a transponder to a reader and synchronizing between a reader carrier frequency and an active load modulation (ALM) carrier frequency within each transmitted frame. Each transmitted frame includes ALM carrier bursts generated from subcarrier modulation by binary phase shift keying (BPSK) data encoding and producing signal oscillations at a transponder antenna after each ALM carrier burst generation, The synchronizing occurs at each phase change of the data encoding when no burst is generated during a half period of the subcarrier preceding the phase change and a half period of the subcarrier following this phase change. The transponder antenna has a moderate quality factor sufficient to naturally damp the signal oscillations so that the synchronizing is performed without performing any controlled signal oscillations damping.