Nicholas A Selby

US Patent:

20190341994, Nov 7, 2019

Filed:

Jul 3, 2019

Appl. No.:

16/503105

Inventors:

- Cambridge MA, US
Nicholas Selby - Cambridge MA, US
Fadel Adib - Cambridge MA, US

International Classification:

H04B 7/145
H04B 7/155
G06K 19/067

Abstract:

A full-duplex analog relay may comprise an analog uplink relay and an analog downlink relay, and may relay signals between a transmitter and a backscatter node. The spectrum of the downlink signal transmitted by the downlink relay may be different than the spectrum of the uplink signal received by the uplink relay. Filtering may attenuate leakage from the downlink relay to the uplink relay, and vice versa. The uplink relay may create a phase offset that is opposite in sign and substantially equal in magnitude to the phase offset created by the downlink relay. The downlink and uplink relays, taken together, may created a substantially constant net phase offset. The full-duplex relay may be housed in a vehicle that moves, and may be used to determine spatial coordinates of backscatter sources that are located in the relay's environment.

US Patent:

20180275246, Sep 27, 2018

Filed:

Mar 26, 2018

Appl. No.:

15/936078

Inventors:

- Cambridge MA, US
Nicholas Selby - Cambridge MA, US
Fadel Adib - Cambridge MA, US

International Classification:

G01S 7/00
G01S 13/06

Abstract:

A transceiver may wirelessly transmit a communication signal at a first frequency and a sensing signal at a second frequency. The communication signal may include a command that causes a backscatter node to modulate impedance of an antenna, and thereby modulate reflectivity of the backscatter node. The communication signal may also deliver wireless power to the backscatter node. While the impedance is being modulated in response to the command, the transceiver may transmit the sensing signal and measure wireless reflections. The power of the sensing signal may be much lower than that of the communication signal. The transceiver may frequency hop the sensing signal in a wide band of frequencies and take measurements at each frequency in the hopping. Based on the measurements, a computer may determine time-of-flight or phase of a reflected signal from the backscatter node and may estimate location of the backscatter node with sub-centimeter precision.

US Patent:

20180234161, Aug 16, 2018

Filed:

Feb 12, 2018

Appl. No.:

15/894901

Inventors:

- Cambridge MA, US
Nicholas Selby - Cambridge MA, US
Fadel Adib - Cambridge MA, US

International Classification:

H04B 7/145
G06K 19/067

Abstract:

A full-duplex analog relay may comprise an analog uplink relay and an analog downlink relay, and may relay signals between a transmitter and a backscatter node. The spectrum of the downlink signal transmitted by the downlink relay may be different than the spectrum of the uplink signal received by the uplink relay. Filtering may attenuate leakage from the downlink relay to the uplink relay, and vice versa. The uplink relay may create a phase offset that is opposite in sign and substantially equal in magnitude to the phase offset created by the downlink relay. The downlink and uplink relays, taken together, may created a substantially constant net phase offset. The full-duplex relay may be housed in a vehicle that moves, and may be used to determine spatial coordinates of backscatter sources that are located in the relay's environment.