Amazing stuff! Sounds almost a bit exotic. Notice two female students are featured here.
"In brief
- In pursuit of a new low-power communication system, researchers turned to thermal noise, background static produced from the vibrations of electrons in electrical conductors.
- An experimental setup successfully sent signals between a transmitter and receiver, but how those signals could be distinguished from background thermal noise when both devices and their surroundings were at room temperature remained a mystery.
- The researchers determined that switching between two types of electrical circuits in the transmitter creates noise frequencies that appear “hotter” and “colder” to the receiver, allowing them to produce a binary code signal.
- The team hopes this could lead to new low-power, wireless options for communications systems that send small amounts of data.
..."
From the significance and abstract:
"Significance
This work develops a wireless channel model and transmission scheme for thermal noise-based communication networks. These systems offer low-power communication in radio-frequency-sensitive environments. By switching a transmitter’s impedance, these systems enable wireless communication by inducing changes in the receiver’s measured thermal noise temperature.
This work models received noise power for impedance-matched and -mismatched transmitter loads.
This work uncovers a previously unidentified physical phenomenon of thermal noise backscatter, which explains how noise-temperature changes can arise at the receiver when the entire system is at ambient temperature. Building on this model, this work derives the channel capacity of thermal noise communications and presents a capacity-achieving scheme. The achievable rate is governed by measurement noise bandwidth and thermal contrast between transmitter load states.
Abstract
Thermal noise communication systems transmit information by modulating thermal radiation, eliminating the need for a dedicated signal power source and making them attractive solutions for low-power sensor networks.
Their efficiency enables long-lived, unobtrusive operation, which is valuable in the Internet of Things, electromagnetic interference-sensitive environments, and radio frequency identification tag systems.
However, a limited understanding of the wireless channel model and efficient transmission schemes has hindered their practical deployment.
Here, we present a wireless channel model that elucidates how systems operating at ambient temperature can modulate thermal noise to convey information.
Our results reveal a thermal noise backscatter mechanism that enables significantly higher data rates than previously achieved.
We designed and built a thermal noise communication system leveraging this mechanism to achieve data rates in the kilobits-per-second range—over two orders of magnitude higher than prior demonstrations.
We also derive the system capacity and show that using polar codes, we are able to achieve this expected capacity.
Our channel model and transmission scheme pave the way for strategies in thermal noise sensing and communication, advancing practical low-power networking for next-generation wireless applications."
First-principles channel model and capacity-achieving transmission scheme in thermal noise backscatter links (no public access)
No preprint paper found!
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