公开(公告)号：US20200314607A1

公开(公告)日：2020-10-01

申请号：US16831741

申请日：2020-03-26

Applicant: Analog Devices, Inc.

Inventor： Eugene Oh Hwang ,  Tao Yu ,  Phillip Nadeau ,  Michael Judy ,  Rui Zhang

IPC: H04W4/38 ,  H04W24/02 ,  H04W24/08

Abstract: Described herein are techniques for improving the signal-to-noise ratio of a wireless sensor platform. The device that interrogates a wireless sensor node (an interrogator) may be configured to determine the quantity to be measured by extracting information from multiple echoes produced in response to multiple interrogation pulses or produced due to multi-path propagation. Although different echoes may have been transformed to different extents, the echoes may share unique characteristics that are specific to the wireless sensor node that produced them. Accordingly, the SNR may be improved by keeping only portions of the received signal that exhibit such characteristics. The SNR may be further improved by summing the echoes together. In some embodiments, the echoes may be summed together in a coherent fashion, thereby producing an echo having an amplitude greater than the amplitude of each of the received echoes.

公开(公告)号：US11805396B2

公开(公告)日：2023-10-31

申请号：US16831741

申请日：2020-03-26

Applicant: Analog Devices, Inc.

Inventor： Eugene Oh Hwang ,  Tao Yu ,  Phillip Nadeau ,  Michael Judy ,  Rui Zhang

IPC: H04W24/02 ,  H04W4/38 ,  H04W24/08

CPC classification number: H04W4/38 ,  H04W24/02 ,  H04W24/08

Abstract: Described herein are techniques for improving the signal-to-noise ratio of a wireless sensor platform. The device that interrogates a wireless sensor node (an interrogator) may be configured to determine the quantity to be measured by extracting information from multiple echoes produced in response to multiple interrogation pulses or produced due to multi-path propagation. Although different echoes may have been transformed to different extents, the echoes may share unique characteristics that are specific to the wireless sensor node that produced them. Accordingly, the SNR may be improved by keeping only portions of the received signal that exhibit such characteristics. The SNR may be further improved by summing the echoes together. In some embodiments, the echoes may be summed together in a coherent fashion, thereby producing an echo having an amplitude greater than the amplitude of each of the received echoes.

公开(公告)号：US11736838B2

公开(公告)日：2023-08-22

申请号：US17395907

申请日：2021-08-06

Applicant: Analog Devices, Inc.

Inventor： Eugene Oh Hwang ,  Tao Yu ,  Tze Lei Poo ,  Rui Zhang

IPC: H04Q9/00

CPC classification number: H04Q9/00 ,  H04Q2209/40 ,  H04Q2209/75

Abstract: A passive wireless sensor may be wirelessly coupled with an interrogator. The sensor uses multiple antennas to receive an interrogation signal from the interrogator and compares a path length difference between the signal received at each antenna. The path length difference changes based on the relative position of the sensor and interrogator. Using the path length difference, the sensor transmits a response signal to the interrogator. The interrogator analyzes the response signal to determine sensor position. The interrogator compares the determined sensor position to a previous known sensor position to determine if an attack has occurred, such as a replay, counterfeit, or tampering attack. The sensor may include cryptographic circuitry that scrambles the response signal, thwarting an attack such as a sniffing attack. The interrogator may include multiple antennas and determine a position of the sensor by calculating an angle-of-arrival that enhances a signal from the sensor, via beamforming.