Abstract: Frequency diverse array (FDA) is a promising antenna technology to achieve physical layer security by varying the frequency of each antenna at the transmitter. However, when the channels of ...

Abstract: A novel frequency diverse array (FDA)-assisted secure transmission framework is proposed, which leverages additional frequency offsets to enhance physical layer security. Specifically, an ...

Add Yahoo as a preferred source to see more of our stories on Google. A selection of active galaxies with supermassive black holes at their centers, illustrating the variety of shapes that can result ...

Inside an incredibly bright cluster of galaxies, a long-dormant supermassive black hole has come back to life. Radio images captured a one-million-light-year-long stream of star-forming particles and ...

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A new study with the incredibly exciting title of "Overdispersed Radio Source Counts and Excess Radio Dipole Detection" has announced quite a thrilling discovery, indeed: Our solar system is moving ...

It may not feel like it, but everything in the universe is in constant motion. Our Sun, with all its planets, orbits the center of the Milky Way, flying through the cosmos at around 450,000 miles per ...

Alfredo has a PhD in Astrophysics and a Master's in Quantum Fields and Fundamental Forces from Imperial College London.View full profile Alfredo has a PhD in Astrophysics and a Master's in Quantum ...

An artist's impression of a coronal mass ejection on a star Olena Shmahalo / Callingham et al. For the first time, astronomers confirmed a massive expulsion of plasma from a star other than the sun. A ...

How fast and in which direction is our solar system moving through the universe? This seemingly simple question is one of the key tests of our cosmological understanding. A research team led by ...

Bielefeld scientist Lukas Böhme, lead author of the study, in front of the Lovell Telescope at the Jodrell Bank Radio Observatory in England. How fast and in which direction is our solar system moving ...