Results 31 to 40 of about 883,994 (287)
Adaptive multi-channel MAC protocol for dense VANET with directional antennas [PDF]
, 2009 Directional antennas in Ad hoc networks offer more benefits than the traditional antennas with omni-directional mode. With directional antennas, it can increase the spatial reuse of the wireless channel.
Xie, Xu +7 more
core +1 more source
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
doaj +1 more source
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 \(G_ i's\).
openaire +2 more sources
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
core +1 more source
Antenna Array Design for Directional Modulation [PDF]
, 2020 Directional modulation (DM) has been applied to linear antenna arrays to increase security of signal transmission. However, only the azimuth angle is considered in the design, due to inherent limitation of the linear array structure, since linear antenna array lacks the ability to scan in the three dimensional (3-D) space.
Zhang, B., Liu, W., Wang, C.
openaire +3 more sources
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
doaj +1 more source
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
core +1 more source
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
doaj +1 more source
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
doaj +1 more source
IEEE Access, 2017 In this paper, a random frequency diverse array-based directional modulation with artificial noise (RFDA-DM-AN) scheme is proposed to enhance physical layer security of wireless communications.
Jinsong Hu +5 more
doaj +1 more source