Placido Mursia

December 20, 2018

Novel Radio Access Network Technologies: The Physical Layer point of view

In today’s mobile networks, we are used to having high speed connectivity most of the times. Hence, a natural question is why do we need to invest so much effort and resources in developing new and more advanced techniques? The answer is that the value is shifting from providing high speed connectivity for mainly man-controlled devise, such as smartphones, to enabling the coexistence of a network of things such as […]
August 31, 2018

Massive MIMO

The radio spectrum has become an increasingly precious and rare resource and much work has been dedicated on ways to improve the capacity of mobile communication systems without actually increasing the spectrum utilized. In this sense, multiple-input multiple-output (MIMO) provides undoubtedly the best solution. Indeed, in MIMO systems the effective available communication resources are increased in the spatial domain, by adding extra antennas at the transmitter side and, often, at […]
August 31, 2018

Precoding techniques

Precoding, also known as digital beamforming, consists in using an antenna array to transmit one or multiple spatially directive signals simultaneously. Every antenna of the transmit array emits a different signal, designed in the digital domain according to some optimization criteria. Thus, precoding is particularly desirable for spatial multiplexing, where we want to transmit a superposition of signals, each with a separate directivity (i.e., each directed to a different receiver, […]