Carnegie Mellon University

Bridgestone Americas Tire Operations, LLC

Swarun Kumar

Anthony Rowe

Artur Balanuta

Robert Iannucci

Adwait Dongare

Akshay Gadre

Akarsh Prabhakara

Anh Luong

Revathy Narayanan

Terence Eugene Wei

Hans R Dorfi

Jingxian Wang

Vaibhav Singh

Haojian Jin

Rajarshi Saha

Elahe Soltanaghaei

Rashad Eletreby

Osman Yagan

Junbo Zhang

Diana Zhang

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

Tire sensing systems operable to determine one or more physical characteristics of a tire include millimeter wave transmitting and receiving devices. A processor is communicatively coupled with a memory that includes instructions to transmit and receive a millimeter wave toward and from the tire. Memory also includes instructions to image first and second radial extents of the tire based on the received millimeter wave as well as instructions to determine a dimensional difference between the first and second radial extents of the tire. Vehicles including such tire sensing systems as well as non-transitory machine-readable storage mediums and methods are also included.

Tire sensing systems and methods

A system that exploits collaboration between a plurality of spatially distributed RFID readers to enhance the range of commercial passive RFID tags, without alteration to the tags. The system uses distributed MIMO to coherently combine signals across geographically separated RFID readers. It is capable of inferring the optimal beamforming parameters to beam energy to a tag without any initial knowledge of the location or orientation of the tags.

Method for extending the range of commercial passive RFID elements

Described herein is a system that overcomes challenges pertaining to density and range of urban LP-WANs despite the limited capabilities of base station and client hardware. The invention proposes a novel technique that aims to disentangle and decode large numbers of interfering transmissions at a simple, single-antenna LP-WAN base station by exploiting the hardware imperfections of low-cost LP-WAN clients to its advantage Second, the present invention exploits the correlation of sensed data collected by LP-WAN nodes to collaboratively reach a far-away base station, even if individual clients are beyond its range.

Low-power wide area networks

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

Growing community of inventors

Pittsburgh, PA, United States of America

Swarun Kumar