Results 31 to 40 of about 716,699 (142)
Beam Training Technique for Millimeter-Wave Cellular Systems Using Retrodirective Arrays
IEEE Access, 2020 Beam training in millimeter-wave (mmWave) cellular systems requires a long processing time that is proportional to the product of the number of transmitting and receiving beams.
Yeong Jun Kim +3 more
doaj +1 more source
Beam Pattern Optimization Method for Subarray‐Based Hybrid Beamforming Systems
Wireless Communications and Mobile Computing, Volume 2020, Issue 1, 2020., 2020 Massive multiple‐input multiple‐output (MIMO) systems operating at millimeter‐wave (mmWave) frequencies promise to satisfy the demand for higher data rates in mobile communication networks. A practical challenge that arises is the calibration in amplitude and phase of these massive MIMO systems, as the antenna elements are too densely packed to provide
Joerg Eisenbeis +7 more
wiley +1 more source
Possibilities to use retrodirective antennas in radar systems [PDF]
Vojnotehnički Glasnik, 2012 Possibilities to use retrodirective antennas in modern radar systems are presented in this paper. The basics of retrodirective theory, practical realizations of retrodirective arrays using corner reflectors, Van-Atta and heterodyne elements are ...
Aleksandar M. Pavić, Veljko Z. Nikolić
doaj +1 more source
Robust Synthesis Algorithm for Directional Modulation Signal with Array Manifold Vectors Uncertainty
International Journal of Antennas and Propagation, Volume 2020, Issue 1, 2020., 2020 Directional modulation (DM) has become a new research hotspot of physical layer security (PLS) communication at the transmitter side. In this paper, we propose a robust synthesis algorithm for DM signal under the condition of the array manifold vectors perturbation.
Tao Hong, Ana Alejos
wiley +1 more source
IEEE Access, 2020 This work presents novel techniques to realize a retrodirective millimeter wave antenna array with wide field of view. High gain arrays in phase conjugate configuration are used in combination with orthogonal polarization states and a novel pulse ...
Ahmed Bilal Numan +2 more
doaj +1 more source
Wireless Communications and Mobile Computing, Volume 2020, Issue 1, 2020., 2020 Millimeter‐wave (mmWave) networks with the frequency spectrum ranging from 30 GHz (with wavelength 10 mm) to 300 GHz (with wavelength 1 mm), can support massive wireless data in fifth‐generation (5G) systems. Importantly, large colocated antenna elements can be exploited at the base station (BS) to facilitate beam‐steering synthesis along the users ...
Shaddrack Yaw Nusenu +2 more
wiley +1 more source
IEEE Access, 2020 An isolation technique, which does not require conventional circulators, is proposed for the realization of a simple and low-cost aperture-coupled circularly polarized antenna for application to full-duplex devices.
Paul Le Bihan +10 more
doaj +1 more source
Miniaturized Retrodirective Arrays for a Nanosatellite Platform [PDF]
, 2012 Abstract : A retrodirective antenna array (RDA) is capable of autonomously steering its radiation pattern toward the source of an interrogating signal, without having prior knowledge of the interrogator location. Integrating an RDA into a mobile platform, such as a nanosatellite, presents unique challenges due to the platform's restrictions in terms of
Wade G. Tonaki +2 more
openaire +1 more source
Millimeter-Wave Retrodirective Wireless Power Transfer Applicable to Small Electronic Devices
IEEE Journal of MicrowavesWith the recent surge in popularity of the Internet of Things (IoT), there also has been a notable increase in research on wirelessly charging IoT enabled electronic devices. Millimeter-wave retrodirective power beaming has recently emerged as a suitable
Sooyoung Oh +6 more
doaj +1 more source
Retrodirective Array Immune to Incident Waves With Arbitrary Polarizations [PDF]
IEEE Transactions on Antennas and Propagation, 2013 A retrodirective array (RDA) capable of retransmitting predictable polarization with respect to any received polarization state is presented. RDAs have the unique ability to scatter the received signal back to the interrogator without prior knowledge of the source location.
Choi, Jun H +3 more
openaire +3 more sources