Results 21 to 30 of about 164,291 (270)
Journal of Algebra, 1992 Directing modules play an important role in the representation theory of algebras. They have many good properties, for example, they are determined by their composition factors. Let \(A\) be an Artin algebra. Following \textit{C. M. Ringel} [Tame algebras and integral quadratic forms, (Lect. Notes Math.
Skowroński, Andrzej, Smalø, Sverre O
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Power Allocation Strategy of Maximizing Secrecy Rate for Secure Directional Modulation Networks
IEEE Access, 2018 In this paper, given the beamforming vector of confidential messages and the artificial noise (AN) projection matrix and total power constraint, a power allocation(PA) strategy of maximizing secrecy rate (Max-SR) is proposed for secure directional ...
Siming Wan +8 more
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Directional amplitude backscatter modulation with suppressed Doppler based on rotating resonant loop
Scientific Reports, 2022 The directional amplitude backscatter modulation with suppressed Doppler is demonstrated based on the scattering from a symmetrically rotating resonant loop. The concept is studied theoretically and experimentally with perfectly compatible results.
Ashkan Azarfar +2 more
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DFT-Based Multi-Directions Directional Modulation
IEEE Wireless Communications Letters, 2019 In this letter, a physically secure multi-directions directional modulation scheme is proposed. The scheme provides an adaptive beam-width assignment, where each user is granted a different beam width based on its channel condition. The scheme can be efficiently implemented using a discrete Fourier transform (DFT)-based algorithm that divides the ...
Hafez, Mohammed +2 more
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A Leakage-Based Directional Modulation Scheme for Frequency Diverse Array in Robot Swarm Networks
IEEE Access, 2020 Robot swarms, which constitute typical multi-user systems, have played more and more important roles in many areas. In this paper, a directional modulation (DM) scheme for frequency diverse array (FDA) based on the leakage power minimization criterion is
Sheng Ke +3 more
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Directional modulation techniques for secure wireless communication: a comprehensive survey
EURASIP Journal on Wireless Communications and Networking, 2022 Directional Modulation (DM) techniques provide wireless communication security against passive eavesdropping by means of specific physical layer characteristics.
Omar Ansari, Muhammad Amin
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Design of OAM Beam Directional Modulation Signal in Communication and Guidance Integration [PDF]
Radioengineering, 2020 An orbital angular momentum directional modulation (OAM-DM) signal is proposed for communication and guidance integration. This signal is transmitted by a uniform circular antenna array (UCA). We divide the array into odd and even antenna groups.
C. Zhu, M. Song, X. Dang
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IET Communications, 2022 Recently, the physical limitation of range‐domain security guarantee for directional modulation with frequency diverse array was disclosed in Ding et al. (IEEE Access 8, 63302–63309 (2020)).
Jiangong Chen +4 more
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Simple-direct-injective modules
Journal of Algebra, 2014 A module \(M\) over a ring is said to be simple-direct-injective if for any two simple submodules \(A\) and \(B\) of \(M\) with \(A\cong B\) and \(B\subset^\oplus M\), we have \(A\subset^\oplus M\). In the paper under review some well-studied rings are characterized using simple-direct-injective modules.
Camillo, Victor +3 more
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Time Frequency Direction Modulation Based on Nonlinear Frequency Diverse Array
IEEE Access, 2023 The conventional frequency diversity array (FDA) can generate arcsine form of continuous direction modulation (DM) waveforms which can automatically scan the entire space range.
Haihua Xie +4 more
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