Literature Database Entry
faist2022coordinated
Waldemar Faist, "Coordinated Coexistence of LoRa and Wi-Fi in Unlicensed 2.4 GHz ISM Radio Band," Bachelor Thesis, School of Electrical Engineering and Computer Science (EECS), TU Berlin (TUB), June 2022. (Advisor: Anatolij Zubow; Referees: Falko Dressler and Thomas Sikora)
Abstract
LoRa has arrived on the 2.4 GHz Industrial, Scientific and Medical (ISM) radio band. However this ISM band is vastly crowded by coexistent technologies, e.g. Wi-Fi, Bluetooth, IEEE 802.15.4 based networks (ZigBee, Thread), RF peripherals and other simple radio devices. LoRa’s coexistence mechanism is based on simple ALOHA protocol resulting in inefficiency, especially for long-distance and low-power LoRa communication. Wi-Fi’s energy detection using Clear Channel Assessment (CCA) is not sensitive enough to detect long-range LoRa communication. In this thesis I proposed two different approaches based on on explicit and coordinated collaboration to improve the coexistence of Wi-Fi and LoRa networks. I evaluated those approaches by the means of experiments. The first approach is based on CTS-to-Self mechanism to crate time windows in Wi-Fi transmissions to lower the average Signal-to-Interference-plus-Noise Ratio (SINR) of LoRa communication. The second approach is based on a spectrum shaping method on Wi-Fi side in order to create coexistence tunnels for LoRa by selectively suppressing sequential subcarriers in Orthogonal Frequency Division Multiplexing (OFDM) signals that overlap with LoRa signals using two different methods: Nulling and emulated nulling by utilizing low-power QAM-64 modulated symbols. Results from the CTS-to-Self approach and spectrum shaping using emulated nulling revealed issues with the Automatic Gain Control (AGC), while real nulling achieved an improvement of the LoRa link. A Monte Carlo simulation showed that spectrum shaping with nulling is suitable for urban environments and can achieve a high throughput gain for LoRa, while the impact on the Wi-Fi network is very small.
Quick access
Contact
Waldemar Faist
BibTeX reference
@phdthesis{faist2022coordinated,
author = {Faist, Waldemar},
title = {{Coordinated Coexistence of LoRa and Wi-Fi in Unlicensed 2.4 GHz ISM Radio Band}},
advisor = {Zubow, Anatolij},
institution = {School of Electrical Engineering and Computer Science (EECS)},
location = {Berlin, Germany},
month = {6},
referee = {Dressler, Falko and Sikora, Thomas},
school = {TU Berlin (TUB)},
type = {Bachelor Thesis},
year = {2022},
}
Copyright notice
Links to final or draft versions of papers are presented here to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted or distributed for commercial purposes without the explicit permission of the copyright holder.
The following applies to all papers listed above that have IEEE copyrights: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
The following applies to all papers listed above that are in submission to IEEE conference/workshop proceedings or journals: This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessible.
The following applies to all papers listed above that have ACM copyrights: ACM COPYRIGHT NOTICE. Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, to republish, to post on servers, or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from Publications Dept., ACM, Inc., fax +1 (212) 869-0481, or permissions@acm.org.
The following applies to all SpringerLink papers listed above that have Springer Science+Business Media copyrights: The original publication is available at www.springerlink.com.
This page was automatically generated using BibDB and bib2web.