公开(公告)号：US20170360317A1

公开(公告)日：2017-12-21

申请号：US15185692

申请日：2016-06-17

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xinyu Zhang ,  Teng Wei ,  Shu Wang ,  Anfu Zhou

IPC: A61B5/024 ,  G10K11/175 ,  H04K3/00

CPC classification number: A61B5/02444 ,  A61B5/05 ,  G01H11/00 ,  H04K3/25

Abstract: A wireless vibrometer employs an antenna array to significantly boost the signal-to-noise ratio of faint received signals twin small objects vibrating at acoustic frequencies. This technique may be used to provide an improved physiological monitor (such as a pulse detector) or for long-range eavesdropping using the emitted power from a cell phone or the like.

公开(公告)号：US10470675B2

公开(公告)日：2019-11-12

申请号：US15185692

申请日：2016-06-17

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xinyu Zhang ,  Teng Wei ,  Shu Wang ,  Anfu Zhou

IPC: A61B5/00 ,  A61B5/024 ,  H04K3/00 ,  A61B5/05 ,  G01H11/00

Abstract: A wireless vibrometer employs an antenna array to significantly boost the signal-to-noise ratio of faint received signals twin small objects vibrating at acoustic frequencies. This technique may be used to provide an improved physiological monitor (such as a pulse detector) or for long-range eavesdropping using the emitted power from a cell phone or the like.

公开(公告)号：US09577731B1

公开(公告)日：2017-02-21

申请号：US14921346

申请日：2015-10-23

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xinyu Zhang ,  Sanjib Sur ,  Teng Wei

IPC: H04L1/02 ,  H04B7/06 ,  H04L1/00 ,  H04B7/08 ,  H04L5/00 ,  H04B7/04

CPC classification number: H04B7/0604 ,  H04B7/0413 ,  H04B7/0825 ,  H04L1/0033 ,  H04L5/0023

Abstract: The inventors have recognized that in RF communication systems, by switching between transmit antennas of an RF transmitter on a sub-symbol basis (antenna index coding), and/or by adaptively determining how often antenna switching occurs (adaptive antenna hopping), an increased amount of data may be wirelessly transmitted to an RF receiver without significantly increasing energy consumption. The inventors have determined that in certain systems, such as ZigBee, data symbols consist of elementary waveform patterns, and that such waveform patterns for transmit antennas may be stored by an RF receiver for later determining transmit antennas for data symbols. The inventors have also determined that the invention may be applied in the frequency domain, such as to OFDM, by storing subcarrier waveform patterns for particular transmit antennas and later determining transmit antennas for subcarriers of data symbols.

Abstract translation: 本发明人已经认识到，在RF通信系统中，通过基于子符号（天线索引编码）来切换RF发射机的发射天线和/或通过自适应地确定天线切换发生的频率（自适应天线跳频），增加 数据量可以无线地传输到RF接收机而不显着增加能量消耗。 本发明人已经确定，在诸如ZigBee的某些系统中，数据符号由基本波形图案组成，并且用于发射天线的这种波形图案可以由RF接收器存储以供稍后确定数据符号的发射天线。 发明人还确定本发明可以通过存储用于特定发射天线的子载波波形模式并且稍后确定用于数据符号的子载波的发射天线来应用于频域，例如OFDM。