Results 221 to 230 of about 2,964,810 (286)

Al-Ca co-doped ZnO nanostructures for enhanced electrical and dielectric properties. [PDF]

Sci Rep
Althumairi NA, Hammami I, Soltani S, Marzougui H, El-Kasaby RA, Hjiri M, Benamara M, Teixeira SS, Graça MPF, Valente MA.   +9 more
europepmc   +1 more source

Gamma-irradiation-induced modification of hopping conductivity in (TlInSe₂)_0.9(TlGaTe₂)_0.1 solid solution. [PDF]

Sci Rep
Sardarly RM, Aliyeva NA, Mammadov IK, Salmanov FT, Mammadov RA, Mammadova GE, Rasulova AA.   +6 more
europepmc   +1 more source

Electrical properties, phase transition, and conduction mechanism of the novel pyrophosphate compound Li₂V_0.4P₂O₇ compared with Li₂Cu_{(1-(5/2)<i>x</i>)}V _<i>x</i> P₂O₇ (<i>x</i> = 0 and 0.2). [PDF]

RSC Adv
Krichen M, Megdiche M.
europepmc   +1 more source

Nonlinear periodic orbit solutions and their bifurcation structure at the origin of soliton hopping in coupled microresonators. [PDF]

Commun Phys
Deshmukh S, Tusnin A, Tikan A, Kippenberg TJ, Schneider TM.   +4 more
europepmc   +1 more source

Elucidating the role of chromium substitution at the iron sites on the structural evolution and electrical performance of copper-based spinel ferrites. [PDF]

RSC Adv
Soudani I, Mustapha N, Hjiri M.
europepmc   +1 more source

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Chaotic frequency hopping sequences

IEEE Transactions on Communications, 1998
This letter describes a novel family of frequency hopping sequences generated by chaotic systems. The sequences give a uniform spread over the entire frequency bandwidth. In addition to having good Hamming correlation properties, they possess ideal linear span.
Ling Cong
exaly   +3 more sources

Sets of Optimal Frequency-Hopping Sequences

IEEE Transactions on Information Theory, 2008
In communication systems, frequency-hopping spread spectrum and direct-sequence spread spectrum are two main spread coding technologies. Frequency-hopping sequences are needed in FH-CDMA systems. In this correspondence, three algebraic constructions of sets of optimal frequency-hopping sequences are presented.
Jianxing Yin
exaly   +3 more sources

Cognitive Frequency Hopping

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008), 2008
To increase the scarcity of spectrum resources and enhance the anti-jamming performance of the system, a novel cognitive frequency hopping mechanism is proposed in the paper. It solves the problem that adaptive frequency hopping can't distinguish between self-interference and interference from other wireless communication systems.
Rongxin Zhi, Luyong Zhang, Zheng Zhou
openaire   +2 more sources

Frequency hopped systems for PCS

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94), 1995
The application of frequency hopping methods to cellular and personal communication systems (PCS) is studied. The performance enhancements due to the use of frequency hopping (FH) is initially reviewed followed by a brief summary of previously designed cellular/PCS systems that have incorporated FH methods.
David E. Borth, Phillip D. Rasky, Greg M. Chiasson, James F. Kepler   +3 more
openaire   +1 more source

Frequency hopping synchronization strategy

2016 3rd International Conference on Systems and Informatics (ICSAI), 2016
Frequency hopping is one of the classic examples of spread-spectrum communications. This paper is about the study of the strategy of the synchronous recognition process. In other words, the topic is in which condition the hopping frequency in the receiver and transmitter can be identified.
Yiyang Li, Man Feng, Wangda Xie
openaire   +2 more sources