VTS Distinguished Lecturer Series : Achieving High Power and Spectral Efficiencies in Wireless Communications - A 5G Challenge


The evolution from 4G (4th Generation) to 5G (5th Generation) wireless systems is driven by the expected huge growth in user bit rates (a 10 to 100 times increase) and overall required bit rates (about 1000 increase). This means a substantial spectral efficiency increase, which must be achieved while maintaining or even improving the power efficiency. To accomplish this one needs to employ new transmission techniques, with the most promising ones being the use of mm-Wave (millimeter Wave) bands and massive MIMO (Multiple-Input and Multiple-Output) schemes. 

The adoption of mm-Wave transmission is mainly due to the huge bands available. Moreover, the small wavelength means small antennas, allowing small-sized transmitter and receivers with very high number antenna elements and, therefore, enabling massive MIMO implementations. However, these frequencies present considerable challenges both in terms of propagation (high propagation free-space path losses, small diffraction effects and almost total absorption losses due to obstacles) and implementation (namely at the power amplification level).  Therefore the design of mm-Wave communications with high power and spectral efficiencies presents a considerable challenge.

In this talk we start by making an overview on the constraints on power and spectral efficiencies and techniques to improve them. Then we present an a massive MIMO architecture for broadband mm-Wave communications that is compatible with highly-efficient, low-cost saturated amplifiers, even for large quadrature amplitude modulation (QAM) constellations or other dense constellations with high spectral efficiency.

  Date and Time




  • INRS EMT Centre
  • 800 De La Gauchetière W
  • Montreal, Quebec
  • Canada H5A 1K6
  • Room Number: 6900
  • Co-sponsored by Prof. Sofiène Affes - INRS


Rui Dinis

Rui Dinis of FCT-UNL


Rui Dinis received the Ph.D. degree from IST, Technical University of Lisbon, Portugal, in 2001 and the Habilitation in Telecommunications from FCT, Nova University of Lisbon (UNL), in 2010. From 2001 to 2008 he was a Professor at IST. Currently he is an associated professor at FCT-UNL. During 2003 he was an invited professor at Carleton University, Ottawa, Canada. He was a researcher at CAPS-IST, from 1992 to 2005 and a researcher at ISR (Institute for Systems and Robotics) from 2005 to 2008. Since 2009 he is a researcher at IT (Instituto de Telecomunicações).

Rui Dinis is an IEEE Distinguished Lecturer and is or was editor at IEEE Transactions on Communications, IEEE Transactions on Wireless Communications, IEEE Transactions on Vehicular Technology, Elsevier Physical Communication and Hindawi ISRN Communications and Networking. He was also a guest editor for Elsevier Physical Communication (Special Issue on Broadband Single-Carrier Transmission Techniques).

He was part of the organizing committee of ICT’2014, VTC’2018 (Spring) and ISWCS’2018, track chair or co-char of VTC’2017(Fall) and VTC’2019 (Spring). He is also a member of several technical committees of IEEE Communications Society (SPCE, RCC, WC and CT).

Rui Dinis has been actively involved in several international research projects in the broadband wireless communications area. He has 20 PhD students (current and past), published 4 books, over 100 journal papers and book chapters and over 300 conference papers (of which 5 received best papers’ awards), and has 15 patents (attributed or pending).

He was involved in pioneer projects on the use of mm-waves for broadband wireless communications and his main research activities are on modulation and transmitter design, nonlinear effects on digital communications and receiver design (detection, equalization, channel estimation and carrier synchronization), with emphasis on frequency-domain implementations, namely for MIMO systems and/or OFDM and SC-FDE modulations. He is also working on cross-layer design and optimization involving PHY, MAC and LLC issues, as well as indoor positioning techniques.