Results 61 to 70 of about 4,433,394 (276)

Securing Physical Layer for FHSS Communication System Using Code andPhase Hopping Techniques in CDMA, System Design and Implementation

Journal of Engineering, 2020
The Frequency-hopping Spread Spectrum (FHSS) systems and techniques are using in military and civilianradar recently and in the communication system for securing the information on wireless communications link channels, for example in the Wi-Fi 8.02.X ...
Saifuldeen A. Mohammed
doaj   +1 more source

Correlated Charge Transport in an Organic Coulomb Glass

Advanced Materials, EarlyView.
ABSTRACT Advances in the development of organic field‐effect transistors (OFETs), electrically gated organic semiconductors (EGOFETs), and organic electrochemical transistors (OECTs) allow for the operation of these devices at very high charge‐carrier densities, where Coulomb interactions between carriers can be expected to become significant.
Magdalena Sophie Dörfler, Heinz Bässler, Harald Oberhofer, Anna Köhler   +3 more
wiley   +1 more source

Self-Organizing Hit Avoidance in Distributed Frequency Hopping Multiple Access Networks

IEEE Access, 2017
In this paper, we investigate the frequency hit avoidance problem in distributed frequency hopping multiple access (FHMA) networks, in which each user intends to avoid the frequency hit with others by choosing the appropriate frequency set and frequency ...
Long Yu, Yuhua Xu, Qihui Wu, Luliang Jia
doaj   +1 more source

Analysis of asynchronous frequency hopping multiple‐access network performance based on the frequency hopping sequences

IET Communications, 2015
In this study, the authors investigate the impact of the frequency‐hopping (FH) sequence on the packet transmission performance of the asynchronous frequency‐hopping multiple‐access (FHMA) network. According to the model of the asynchronous FHMA network given in this study, the authors analyse the impact of the two important FH sequence factors ...
Lei Guan, Zan Li 0001, Jiangbo Si, Benjian Hao   +3 more
openaire   +2 more sources

Resistance to Overdoping Allows Over 2000 S cm−1 Conductivity in P(g3BTTT) With Anion‐Exchange Doping

Advanced Materials, EarlyView.
Anion‐exchange doping of conjugated polymers is an effective way to achieve high conductivities. Here, we report over 2000 S cm−1 electrical conductivity for doped P(g3BTTT). In addition, we show that P(g3BTTT) sustains exceptionally high doping levels without any drop in the charge mobility.
Basil Hunger, Maximilian M. Horn, Eva Röck, Diego Rosas Villalva, Lize Bynens, Jochen Vanderspikken, Christina Kousseff, Silène Gobeil, Olivier Bardagot, Nesibe Akmanşen‐Kalayci, Sarah H. Tolbert, Iain McCulloch, Wouter Maes, Demetra Tsokkou, Natalie Banerji   +14 more
wiley   +1 more source

Iterative Decoding and Soft Interference Cancellation in Fast Frequency Hopping Multiuser System Using Clipped Combining

, 2007
Iterative decoding (ID) aided fast frequency hopping (FFH), M-ary frequency shift keying (MFSK) using clipped combining in multiple access (MA) channels is investigated. All users’ data are convolutionally encoded and the encoded bits are interleaved and
Ng, S.X., Ahmed, S., Lie-Liang Yang, Soon Xin Ng, Yang, L.L., Hanzo, L., Lajos Hanzo, Sohail Ahmed   +7 more
core   +2 more sources

Low-Hit-Zone Frequency/Time Hopping Sequence Sets With Large Family Size

IEEE Access, 2019
For a quasi-synchronous frequency/time hopping (FH/TH) code-division multiple-access (CDMA) system which involves many users, the low-hit-zone (LHZ) FH/TH sequence set with large family size is necessary.
Xing Liu, Qin Shu, Qi Zeng
doaj   +1 more source

Organic Materials of Tomorrow: Horizons of Artificial Intelligence

Advanced Materials, EarlyView.
This review examines machine learning techniques accelerating the discovery of organic semiconductors by linking molecular structure to properties. Key methods include graph neural networks, generative models, and active learning. Applications to organic photovoltaics demonstrate practical impact.
Harold Mena, J. Terence Blaskovits, Kun‐Han Lin, Denis Andrienko   +3 more
wiley   +1 more source

Convergence Analysis of Iteratively Detected Time Hopping and DS-CDMA Ultrawide Bandwidth Systems by EXIT Charts, [PDF]

, 2008
This paper presents a novel analysis on the decoding convergence of Time Hopping (TH) and Direct Sequence (DS) Code-Division Multiple-Access (CDMA) Ultrawide Bandwidth (UWB) systems when communicating over multipath Nakagami channels.
Ahmed, Qasim, Ng, Soon, Chen, Sheng, El Hajjar, Mohammed, Riaz, Raja, Hanzo, Lajos   +5 more
core   +2 more sources

Deep Reinforcement Learning-Based Anti-Jamming Approach for Fast Frequency Hopping Systems

IEEE Open Journal of the Communications Society
Increasing the hopping frequency speed and integrating artificial intelligence (AI) technologies are currently two of the most effective strategies for enhancing the anti-jamming performance of frequency hopping (FH) systems.
Sixi Cheng, Xiang Ling, Lidong Zhu
doaj   +1 more source