Cristian Rusu

TL;DR: In this article, the authors proposed hybrid architectures based on switching networks to reduce the complexity and the power consumption of the structures based on phase shifters and defined a power consumption model and used it to evaluate the energy efficiency of both structures.

TL;DR: Numerical results show that architectures based on switches obtain equal or better channel estimation performance to that obtained using phase shifters, while reducing hardware complexity and power consumption, and all the hybrid architectures provide similar spectral efficiencies.

TL;DR: A different hybrid architecture is proposed, which simplifies the hardware at the receiver by replacing the phase shifters with switches and a new approach for compressed sensing based channel estimation for the hybrid architectures is presented.

TL;DR: This paper introduces and analyzes several algorithms that efficiently design hybrid precoders and combiners starting from the known optimum digital precoder/combiner, which can be computed when perfect channel state information is available.

TL;DR: In this paper, a blind lens model analysis of the quadruply imaged quasar lens HE 0435-1223 using deep Hubble Space Telescope imaging, updated time-delay measurements from the COSmological MOnitoring of GRAvItational Lenses (COSMOGRAIL), a measurement of the velocity dispersion of the lens galaxy based on Keck data, and a characterization of the mass distribution along the line of sight.