**Author details**

Janis Braunfelds1 \*, Sandis Spolitis1 , Jurgis Porins2 and Vjaceslavs Bobrovs2

1 Riga Technical University, Communication Technologies Research Center, Riga, Latvia

2 Riga Technical University, Institute of Telecommunications, Riga, Latvia

\*Address all correspondence to: janis.braunfelds@rtu.lv

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
