Results 41 to 50 of about 2,131,184 (147)

Offline Learning for Acknowledgment Optimization in Massive LoRaWAN Networks

Internet Technology Letters, Volume 8, Issue 6, November/December 2025.
ABSTRACT LoRaWAN faces critical limitations in large‐scale deployments due to spectrum contention, duty‐cycle restrictions, and energy constraints. These challenges impact the reliability and responsiveness of bidirectional communication particularly when conventional acknowledgment mechanisms are used.
Leila Aissaoui Ferhi
wiley   +1 more source

Mobile Robot Localization Using Biased Chirp Spread Spectrum Ranging

, 2018
In this paper, we propose a method of mobile robot localization based on chirp-spread-spectrum (CSS) ranging. By using the CSS system, the distances between a mobile robot and CSS nodes fixed at known coordinates can be measured according to the time of ...
Kim, SW, Cho, H
core   +1 more source

Chirp Spread Spectrum-Based Waveform Design and Detection Mechanisms for LPWAN-Based IoT: A Survey

IEEE Access
The Long Range protocol, commonly referred to as LoRa, is a widely adopted and highly regarded method of utilizing chirp spread spectrum (CSS) techniques at the physical (PHY) layer to facilitate low-power wide-area network (LPWAN) connectivity.
Ali Waqar Azim, Raed Shubair, Marwa Chafii   +2 more
doaj   +1 more source

M‐SADR: Mobile Self Adaptive Data Rate for Enhanced LoRa End‐Device Connectivity on the Move

International Journal of Communication Systems, Volume 38, Issue 15, October 2025.
The proposed M‐SADR method targets mobile LoRa end‐devices and achieves better performance, with a 2.4% improvement in packet delivery ratio and a 5.7% reduction in power consumption per successfully delivered packet. ABSTRACT Mobility is a critical aspect of the Internet of Things, reflecting the diverse and dynamic nature of potential applications ...
Vasileios Moysiadis, Panagiotis Radoglou‐Grammatikis, Evangelos Mourikis, Maria Zevgara, Dimitrios N. Skoutas, Charalabos Skianis, Panagiotis Sarigiannidis   +6 more
wiley   +1 more source

An enhanced positioning scheme for chirp spread spectrum ranging

, 2018
In this paper, we propose an algorithm for acquiring enhanced position coordinates when using the chirp spread spectrum (CSS) specified in IEEE 802.15.4a.
Lee, CW, Kim, SW, Ban, SJ, Cho, H
core   +1 more source

Bit error rate characterization of LoRa chirp spread spectrum modulation across spreading factors: a Simulink-based analysis

New Trends in Computer Sciences
Low-Power Wide-Area Networks (LPWANs) based on LoRa technology have gained prominence in Internet of Things (IoT) deployments due to their long-range communication capabilities and low power consumption.
Osemwegie Sam Omorogiuwa, Oseiwe Godswill Imonje, Oduware Okosun   +2 more
doaj   +1 more source

Visual and auditory attention in individuals with DYRK1A and SCN2A disruptive variants

Autism Research, Volume 18, Issue 5, Page 909-921, May 2025.
Abstract This preliminary study sought to assess biomarkers of attention using electroencephalography (EEG) and eye tracking in two ultra‐rare monogenic populations associated with autism spectrum disorder (ASD). Relative to idiopathic ASD (n = 12) and neurotypical comparison (n = 49) groups, divergent attention profiles were observed for the monogenic
Caitlin M. Hudac, Kelsey Dommer, Monique Mahony, Trent D. DesChamps, Brianna Cairney, Rachel Earl, Evangeline C. Kurtz‐Nelson, Jessica Bradshaw, Raphael A. Bernier, Evan E. Eichler, Emily Neuhaus, Sara Jane Webb, Frederick Shic   +12 more
wiley   +1 more source

Layered Chirp Spread Spectrum Modulations for LPWANs

This article examines two chirp spread spectrum techniques specifically devised for low-power wide-area networks (LPWANs) to optimize energy and spectral efficiency (SE). These methods referred to as layered CSS (LCSS) and layered dual-mode CSS (LDMCSS),
Bomfin, Roberto, Shubair, Raed, Azim, Ali Waqar, Bazzi, Ahmad, Chafii, Marwa   +4 more
core   +1 more source

Energy‐Aware Protocol Design and Evaluation of the PHY Layer in Satellite IoT

International Journal of Satellite Communications and Networking, Volume 43, Issue 2, Page 61-76, March/April 2025.
ABSTRACT Direct‐to‐satellite communication for the Internet of Things (IoT) has attracted significant interest from both the scientific community and major telecommunications players. The integration of satellite connectivity in smartphones and IoT devices promises a transformative impact on critical applications such as environmental monitoring, asset
Simon Heine, Christian A. Hofmann, Andreas Knopp   +2 more
wiley   +1 more source

Overlapping M-ary Frequency Shift Keying Spread-Spectrum Multiple-Access Systems using Random Signature Sequences

, 1999
In this paper, a multiple-access spread-spectrum communication system using binary frequency shift keying (BFSK) or M-ary frequency shift keying (MFSK) and noncoherent demodulation is considered.
Yang, L-L., Hanzo, L.
core   +1 more source