Results 31 to 40 of about 2,083,913 (216)

The feasibility of combating multipath interference by chirp spread spectrum techniques over Rayleigh and Rician fading channels

, 2010
[[abstract]]©1994 IEEE-This paper studies the feasibility of using chirp spread spectrum signals to combat multipath interference in binary digital communication systems over Rayleigh and Rician fading channels.
Ywh-Ren Tsai;Jin-Fu Chang
core   +1 more source

Interference Excision in Spread Spectrum Communications Using Adaptive Positive Time-Frequency Analysis

EURASIP Journal on Wireless Communications and Networking, 2007
This paper introduces a novel algorithm to excise single and multicomponent chirp-like interferences in direct sequence spread spectrum (DSSS) communications.
Sridhar Krishnan, Serhat Erküçük   +1 more
doaj   +2 more sources

Chirp-Based FHSS Receiver with Recursive Symbol Synchronization for Underwater Acoustic Communication

Sensors, 2018
In this paper, we propose a covert underwater acoustic communication method that is robust to fading using a chirp signal combined with a frequency-hopping spread spectrum scheme.
Geunhyeok Lee, Woongjin Park, Taewoong Kang, Kiman Kim, Wanjin Kim   +4 more
doaj   +1 more source

HybNet: A Hybrid Deep Learning-Matched Filter Approach for IoT Signal Detection

IEEE Transactions on Machine Learning in Communications and Networking, 2023
Random access schemes are widely used in IoT wireless access networks. They enable a reduced complexity and overcome power consumption constraints. Nevertheless, random access results in high packet losses which are caused by overlapping transmissions ...
Kosta Dakic, Bassel Al Homssi, Margaret Lech, Akram Al-Hourani   +3 more
doaj   +1 more source

Performance analysis of DSSS- and CSS-based physical layer for IoT transmission over LEO satellites

ETRI Journal, 2022
To determine a suitable waveform for Internet of Things (IoT) transmission over low-Earth orbit (LEO) satellites, this paper reports the results of a performance comparison between chirp spread spectrum (CSS)-based LoRa and direct sequence spread ...
Sooyeob Jung, Gyeongrae Im, Dong-Hyun Jung, Pansoo Kim, Joon Gyu Ryu, Joonhyuk Kang   +5 more
doaj   +1 more source

Tumor‐Derived Exosomal circAP2B1 Induces M2 Macrophage Polarization by Enhancing Mitochondrial Homeostasis to Promote Esophageal Squamous Cell Carcinoma Progression

Advanced Science, EarlyView.
ESCC‐derived exosomal circAP2B1 promotes tumor progression by reprogramming mitochondrial metabolism via the ESRRA/KPNA1/MFN2 axis to induce M2 polarization of macrophages. ABSTRACT Esophageal squamous cell carcinoma (ESCC) remodels the immunosuppressive tumor microenvironment via exosome‐mediated intercellular communication.
Yiru Wang, Gang Feng, Youyu Wang, Ruihao Liang, Haixia Pan, Kai Lei   +5 more
wiley   +1 more source

Chirp Spread Spectrum Signaling for Future Air-Ground Communications [PDF]

MILCOM 2019 - 2019 IEEE Military Communications Conference (MILCOM), 2019
In this paper, we investigate the use of chirp spread spectrum signaling over air-ground channels. This includes evaluation of not only the traditional linear chirp, but also of a new chirp signal format we have devised for multiple access applications.
Nozhan Hosseini, David W. Matolak
openaire   +2 more sources

A New LoRa-like Transceiver Suited for LEO Satellite Communications

Sensors, 2022
LoRa is based on the chirp spread spectrum (CSS) modulation, which has been developed for low power and long-range wireless Internet of Things (IoT) communications.
Mohamed Amine Ben Temim, Guillaume Ferré, Romain Tajan   +2 more
doaj   +1 more source

Heat‐Suppressing Projection Two‐Photon Lithography Enables High‐Throughput Sub‐Micrometer Manufacturing of Biopolymer Hydrogels for Tissue Engineering

Advanced Science, EarlyView.
The iLEAP technique integrates high‐throughput two‐photon lithography with extrusion printing, bridging sub‐micrometer precision and macroscopic scaffold fabrication. By employing a low‐exothermic photoinitiator, it mitigates thermal damage to biopolymers and preserves bioactivity.
Qifeng Guan, Yanzhe Fu, Xiangyu Xu, Naitao Li, Sen Hou, Kai Wang, Yufan Wang, Jiakun Li, Ping Li, Jiebo Li, Lizhen Wang, Yubo Fan   +11 more
wiley   +1 more source

Enhanced LoRa-Like Transmission for Multiuser Interference Environments Using Variable-Slope Chirp Spread Spectrum Signals

IEEE Access
We consider the setting of Long Range (LoRa) transmission in the uplink of a multi-user system, where users operate with the same spreading factor. LoRa is a popular low-power wide area network wireless protocol that is designed for IoT applications ...
Dalia Ibrahim, Karim Banawan, Said E. El-Khamy   +2 more
doaj   +1 more source