Results 11 to 20 of about 52,116 (297)
Time-Modulated OFDM Directional Modulation Transmitters [PDF]
IEEE Transactions on Vehicular Technology, 2019 In this paper, directional modulation (DM) transmitters, designed for orthogonal frequency-division multiplexing (OFDM) wireless data transfer are proposed using time-modulated arrays. It is shown that by properly designing the switch controlling time sequences the proposed time-modulated OFDM DM systems exhibit promising features, such as 1) requires ...
Yuan Ding 0001 +3 more
openaire +4 more sources
DFT-Based Multi-Directions Directional Modulation [PDF]
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 ...
Mohammed Hafez +2 more
openaire +4 more sources
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
doaj +2 more sources
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
AerospaceSatellite communications are pivotal to global Internet access, connectivity, and the advancement of information warfare. Despite these importance, the open nature of satellite channels makes them vulnerable to eavesdropping, making the enhancement of ...
Zhiyu Hao +5 more
doaj +2 more sources
Directional Modulation for Compact Devices
, 2022 S.2094-2097A new directional modulation system that uses radiation pattern data for modulation encoding is proposed. The approach allows compact multiport antennas (e.g., MIMO-capable antennas) to be used for directional modulation, replacing extensive ...
Ammann, M.J. +2 more
core +2 more sources
Metasurface Based Positional Modulation Design
IEEE Access, 2020 Directional modulation (DM) can transmit information to the desired direction or directions with known constellation mappings, but with scrambled ones in other directions.
Bo Zhang +6 more
doaj +1 more source
Drones, 2023 Recently, intelligent reflecting surfaces (IRSs) and unmanned aerial vehicles (UAVs) have been integrated into wireless communication systems to enhance the performance of air–ground transmission. To balance performance, cost, and power consumption well,
Rongen Dong +6 more
doaj +1 more source
IEEE Open Journal of the Communications Society, 2022 Intelligent reflecting surface (IRS) is a revolutionary and low-cost technology for boosting the spectrum and energy efficiencies in future wireless communication network. In order to create controllable multipath transmission in the conventional line-of-
Rongen Dong +5 more
doaj +1 more source
CXCL14 is no direct modulator of CXCR4 [PDF]
FEBS Letters, 2014 C‐X‐C motif chemokine 12/C‐X‐C chemokine receptor type 4 (CXCL12/CXCR4) signaling is involved in ontogenesis, hematopoiesis, immune function and cancer. Recently, the orphan chemokine CXCL14 was reported to inhibit CXCL12‐induced chemotaxis – probably by allosteric modulation of CXCR4.
Otte, Maik +5 more
openaire +2 more sources