Carnegie Mellon University

Artur Balanuta

Anthony Rowe

Swarun Kumar

Robert Iannucci

Anh Luong

Adwait Dongare

Akshay Gadre

Revathy Narayanan

Akarsh Prabhakara

Elahe Soltanaghaei

A method of operating a frequency modulated continuous-wave radar can include transmitting CHIRP signals from a plurality of antennas of the frequency modulated continuous-wave radar, receiving, via the plurality of antennas, signals including asynchronously modulated retro-directive signals from at least one remote radio frequency tag generated responsive to the CHIRP signals, generating difference Intermediate Frequency signals from the CHIRP signals transmitted and the signals received, and performing a first transform operation on the difference Intermediate Frequency signals to detect occurrence of the asynchronously modulated retro-directive signals in the difference Intermediate Frequency signals.

Methods, systems, and low power retro-directive RF tags for localization

A method of providing wireless communications in a wireless network can include wirelessly receiving a chirp spread-spectrum modulated signal at a first gateway device, the chirp spread-spectrum modulated signal being transmitted by a remote client device. The chirp spread-spectrum modulated signal can be demodulated at the first gateway device to provide demodulated data at the first gateway device. The demodulated data can be processed to provide an indication that a decode of a packet including the demodulated data failed. Time adjacent chirps included in the demodulated data can be combined to provide combined data at the first gateway device. A message can be transmitted from the first gateway device to a remote server responsive to an amplitude of the combined data exceeding a threshold value and the indication that the decode of the packet including the demodulated data failed.

Methods, systems, and articles of manufacture for joint decoding of packets in wireless networks using chirp spread-spectrum modulation

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Pittsburgh, PA, United States of America

Artur Balanuta