keywords and power footnote

paper/main.tex

@@ -125,7 +125,7 @@ Politecnico di Milano, Italy}
 \ccsdesc[500]{Computer systems organization~Embedded systems}
 
 
-\keywords{Keywords}
+\keywords{Power-aware computing -- cyber-physical modeling -- localization systems.}
 
 
 \maketitle

paper/sections/03-model.tex

@@ -241,7 +241,7 @@ accuracy. As for power consumption, the receiver always consumes a
 additional power when its radio is turned on, which is precisely the
 cause of battery draining. This power has been experimentally shown to
 be constant in time~\cite{bib:enloc-smartphones, bib:microsoft-leap}
-and usually around 400mW. Our model needs to capture whether:
+and usually around 400mW\footnote{This quantity apparently depends on the specific device. It can of course be changed according to the given use-case. Moreover for the simple evaluation of the trade-off it is not strictly relevant since we would be interested in the differential values. If instead is required an absolute estimation of the consumed energy, then a precise evaluation of this quantity is required.}. Our model needs to capture whether:
 \begin{enumerate}
   \item \emph{ephemeris data} are available or not;
   \item \emph{ranging data} are available or not;