Results 21 to 30 of about 1,030,149 (344)

An Adaptive Multi-Mode Underwater Acoustic Communication System Using OSDM and Direct Sequence Spread Spectrum Modulation

IEEE Access, 2021
Dynamic underwater acoustic network is a research hotspot. Due to the complexity and time-varying of underwater acoustic channel, the performance of single-mode underwater acoustic communication system is often limited by the worst channel situation ...
Lanjun Liu, Hui Ren, Hao Zhao, Jiong Niu, Jialin Chen, Junfeng Wang   +5 more
doaj   +1 more source

Modeling research of group delay ripple on the performance analysis oriented to a satellite direct sequence spread spectrum communication system

Xibei Gongye Daxue Xuebao
This study introduces the group delay and its characteristics in satellite channel, meanwhile, the model of the impact of group delay ripple on performance of direct sequence spread spectrum communication system is established and simulated for analysis.
LI Xiongfei, ZHAI Jiqiang, SUN Xuemin, GUO Yangming, ZHOU Guochang   +4 more
doaj   +1 more source

New bounds on RAKE structures for DS-CDMA over frequency-selective Rayleigh fading channels [PDF]

, 1996
An upper bound is derived for the probability of error in an asynchronous binary direct-sequence spread-spectrum multiple-access communications system operating over frequency selective Rayleigh fading channels. A coherent RAKE receiver with predetection
Calvo Zorrilla, Sergio, Vázquez Grau, Gregorio   +1 more
core   +1 more source

Horst Steible, unter Mitarbeit von Hermann Behrens, Die altsumerischen Bau- und Weihinschriften. Teil I: Inschriften aus ,Lagas'. Teil II: Kommentar zu den Inschriften aus ,Lagas'. Inschriften ausserhalb von ,Lagas'. Wiesbaden, Franz Steiner Verlag, 1982; Freiburger Altorientalische Studien, Band 5 [PDF]

, 1984
This thesis investigates techniques for stealth hydroacoustic communication using spread spectrum. The Swedish naval defense organisations have a vision that all their units should be able to communicate with each other, even between underwater vehicles.
Andersson, Magnus, Severinson, Kristofer
core   +1 more source

Modulation parameter estimation of LFM interference for direct sequence spread spectrum communication system in alpha-stable noise [PDF]

, 2021
The linear frequency modulation (LFM) interference is one of the typical broadband interferences in direct sequence spread spectrum (DSSS) communication system.
Chen, Yunfei, Gong, Fengkui, Han, Yuting, Liu, Mingquian, Song, Hao, Yang, Zhutian   +5 more
core   +1 more source

Watermarking for multimedia security using complex wavelets [PDF]

, 2010
This paper investigates the application of complex wavelet transforms to the field of digital data hiding. Complex wavelets offer improved directional selectivity and shift invariance over their discretely sampled counterparts allowing for better ...
Bouridane, Ahmed, Kurugollu, Fatih, Tanougast, Camel, Thompson, Alastair Ian   +3 more
core   +2 more sources

The HIT Network for Children and Adolescents With CNS Tumors Facilitates Improvements of Diagnostic Assessments, Multimodal Treatments, Individual Counseling, and Research in Germany, Austria, and Switzerland

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background The HIT network was established in 2000 to create a population‐based structure aiming to improve survival rates and reduce late effects for children with central nervous system (CNS) tumors by conducting comprehensive clinical trials.
Stefan Rutkowski, Michael C. Frühwald, Gudrun Fleischhack, Stephan Tippelt, Pablo Hernáiz‐Driever, Olaf Witt, Astrid Gnekow, Christof Kramm, Matthias Eyrich, Johannes E. A. Wolf, Hermann Müller, Carsten Friedrich, Uwe R. Kordes, Denise Obrecht‐Sturm, Petra Ketteler, Barbara von Zezschwitz, Pascal Johann, Dominik Sturm, Karoline Nemes, Stefan Schönberger, Till Milde, Brigitte Bison, Monika Warmuth‐Metz, Torsten Pietsch, Ulrich Schüller, Arend Koch, David Capper, Martin Hasselblatt, Christian Thomas, Christian Hagel, Stefan M. Pfister, Felix Sahm, David T. W. Jones, Martin U. Schuhmann, Jürgen Krauss, Pedram Emami, Ahmed El Damaty, Rolf D. Kortmann, Rudolf Schwarz, Jürgen Debus, Mechthild Krause, Fabian Pohl, Holger Ottensmeier, Lisa Bußenius, Katja Baust, Andreas Faldum, Cecile Ronckers, Desiree Grabow, Martin Benesch, Thomas Perwein, Karin Dieckmann, Irene Slavc, Johannes Gojo, Nicolas U. Gerber, André O. von Bueren, Katrin Scheinemann, Gabriele Calaminus, Beate Timmermann, Ulrich‐Wilhelm Thomale, Martin Mynarek   +59 more
wiley   +1 more source

Rancang Bangun FM Transmitter Menggunakan Metode Spread Spectrum Signal Berbasis Raspberry Pi

Jurnal Jaringan Telekomunikasi, 2021
Kebutuhan akan sistem Komunikasi yang dapat mengatasi masalah interferensi, dapat menjamin kerahasiaan informasi yang dikirim dan dapat beroperasi pada tingkat S/N  (Signal to Noise Ratio)  yang rendah atau tahan terhadap pada derau yang besar.Salah ...
Achmad Hanif, Aad Hariyadi, Aisah Aisah
doaj   +1 more source

Patient Activation in Childhood, Adolescent, and Young Adult Cancer Survivors: Current Insights and Implications for Survivorship Care—A Systematic Review From the e‐QuoL Project

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Purpose Patient activation—encompassing knowledge, confidence, and skills in managing individual's health—is a cornerstone of person‐centered care. However, its significance among childhood, adolescent, and young adult cancer survivors (CAYACS) remains unexplored. This article examines the application of the 13‐item Patient Activation Measure (
Charlotte Demoor‐Goldschmidt, Anne Maas, Gisela Michel, Amandine Bertrand, Kristen E. T. Thornton, Martine Bellanger, Anna‐Liesa Filbert, Desiree Grabow, Monica Muraca, Katharina Roser, Sara Oberti, Jelena Roganovic, Hanne Cathrine Lie   +12 more
wiley   +1 more source

Mine TOA ranging method based on re-spread spectrum to WiFi signal

Gong-kuang zidonghua, 2017
TOA ranging method requests high precision time measurement while existing mine WiFi systems can not provide high temporal resolution timer. In order to resolve the above technical problems, a TOA ranging method using re-spread spectrum technology to ...
SUN Jiping, JIANG Ensong
doaj   +1 more source