**Author details**

Kostas Peppas

*National Center For Scientific Research "Demokritos", Laboratory of Wireless Communications, Institute of Informatics and Telecommunications, 15310 Athens, Greece*

Hector E. Nistazakis and George S. Tombras

*Department of Electronics, Computers, Telecommunications and Control, Faculty of Physics, National and Kapodistrian University of Athens, 15784, Athens Greece*

#### Vasiliki D. Assimakopoulos

*Institute of Environmental Research and Sustainable Development of the National Observatory of Athens, I. Metaxa and Vas. Pavlou, Athens, 15236, Greece*

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