Results 31 to 40 of about 52,116 (297)
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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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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Linearized and High Frequency Electrooptic Modulators [PDF]
, 2005 An analysis is performed of many standard and linearized electrooptic modulators known in the industry. The transfer functions of these modulators are evaluated under a consistent set of performance figures of merit, which are gain and spur-free dynamic
Cummings, Uri Vaughan
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Secure M-PSK Communication via Directional Modulation [PDF]
, 2016 peer reviewedIn this work, a directional modulation-based technique is devised to enhance the security of a multi-antenna wireless communication system employing M-PSK modulation to convey information.
OTTERSTEN, Björn +9 more
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Directional Modulation Design Under a Constant Magnitude Constraint for Weight Coefficients
IEEE Access, 2019 Directional modulation (DM) as a physical layer security technique has been studied from many different aspects recently. Normally all existing designs based on antenna arrays lead to varying weight coefficients for different antennas and for different ...
Bo Zhang +4 more
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Sparse Antenna Array Based Positional Modulation Design With a Low-Complexity Metasurface
IEEE Access, 2020 Positional modulation (PM) has been introduced recently where a given modulation pattern can only be received at certain desired positions. To achieve it, the multi-path effect is exploited for positional modulation with the aid of metasurface acting as ...
Bo Zhang +9 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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Orthogonally Polarized Dual-Channel Directional Modulation Based on Crossed-Dipole Arrays
IEEE Access, 2019 Directional modulation (DM) as a physical layer security technique has been studied based on the traditional antenna arrays; however, in most of the designs, only one signal is transmitted at one carrier frequency.
Bo Zhang, Wei Liu, Xiang Lan
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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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Direct summands of direct products of slender modules [PDF]
Pacific Journal of Mathematics, 1985 Suppose \(P=\prod_{I}G_ i\) is a direct product of slender R-modules. If \(| I|\) is non-measurable and A is a direct summand of P, then \(A=\prod_{J}A_ j\) where each \(A_ j\) is isomorphic to a direct summand of a countable direct product of \(G_ i's\).
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