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\chapter{Laboratory testing}
\textit{Každá section jak protokol, Co chci změřit, Fyzika - princip toho co měřím, čím to měřím, zapojení měřící techniky, tabulky, graf}
\section{Communication range}
One of main consideration when choosing a IoT platform is communication range. Main source of attenuation of radio energy caused by electric field dispersion/diffusion of electric field. This effect if best described by \ac{FSPL}:
\begin{equation}
FSPL=\left( \frac{4 \pi d}{\lambda} \right) ^2
\end{equation}
Signal attenuation is also dependent on directivity of antennas and loss on connectors and \textbf{electrical wiring}. When antenna and transmission total \textbf{gain} is constant and can be added to equation like this:
\begin{equation}
A = D_{ANT} \cdot A_{RX} \cdot \left( \frac{4 \pi d}{\lambda} \right) ^2
\end{equation}
Where $D_{ANT}$ is directivity of antenna and $A_{RX}$ is total loss from \ac{RF} connector to \ac{LTE} modem. These must be accounted to only when measuring on directly on LTE modem.
This can be converted to simplify calculation to decibel form:
\begin{equation}
A = D_{ANT}^{[dB]} + A_{RX}^{[dB]} + 10 \cdot \log_{10} \left( \frac{4 \pi d}{\lambda} \right) ^2
\end{equation}
From this a maximal range can be simulated using \ac{RF} attenuators in laboratory environment by converting
\begin{equation}
d = A_{max}
\end{equation}
Dosah zásvisí na vzdálenosti, v ideálních podmínkách line of sight Free-space path loss
Popis Free-space path loss, teorie, vzorečky
Technika - variable attenuator,
Tabulka utlum , km ve free-space , teoreticka sila signalu , signal na vstupu podle FW , packet drop / BER
\section{Noise immunity - reliability}
Noise makes signal bad, reciver much sad.
Teorie, vzorecky, Bit error rate, Added white gausian noise
Teoreticke vypocty pro NB-IoT, LTE-M, DECT NR+
Technika zdroj šumu, směšovač,
Pro jednotlivé AWGN a CNR carier noise ratio
Tabulka utlum , km ve free-space , teoreticka sila signalu , signal na vstupu podle FW , packet drop / BER , spotřeba
\section{Power consumtion}
Globalni oteplovani bad, small battery good
Technika Power Profiler Kit II
\section{Latency}
Pro jednotlivé AWGN a CNR carier noise ratio
Tabulka utlum , km ve free-space , teoreticka sila signalu , signal na vstupu podle FW , packet drop / BER , spotřeba , latence
Experimentální ověření NB-IoT, LTC-M, DECT NR+:
\begin{itemize}
\item dosah - popis cesty šíření ve volném prostoru, odkaz na teoretický výpočet útlumi vzdáleností ve volném prostředí ve vzduchu. Popis atenuátoru.
\item spotřeba - variabilní snižování síly signálu, popis Power Profiler Kit II
\item přenosová rychlost - primárně pro DECT, praktická superhurbá přenosová rychlost UDP Byty/(čas od konce do začátku sleep)
\item odolnost vůči šumu - VF generátor šumu, teorie
\end{itemize}
Experimentální ověření DECT NR+ navíc:
\begin{itemize}
\item spolehlivost -
\item latence -
\end{itemize}
Teorie mereni - Náhradní modely prostředí. Degradace signálu.
Popis experimentální instrumentace a sestav.
Spotřeba, packet drop, rychlost, latence závislá na útlumu (popř. intenzita bílého šumu) (vsechny protokoly)
\section{Measurement}
\begin{sidewaystable}
\centering
\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|c|c|}
\hline
\multicolumn{2}{|c|}{Nominal} &
\multicolumn{3}{c|}{nRF modem} &
\multicolumn{2}{c|}{nRF FW} &
\multicolumn{6}{c|}{Power Kit II} \\
\hline
$K_U$ & CL & $P_I$ & $Q_I$ & $SNR$ & $T_{lat}$ & $PD$ & $P_{TX}$ & $P_{RX}$ & W & $T_{TX}$ & $T_{RX}$ & $R_B$ \\
[dB] & [dB] & [dBm] & [dBm] & [dB] & [ms] & [\%] & [mA] & [mA] & [J/msg] & [$\mu$ s] & [$\mu$ s] & [kB/s] \\\hline
0 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
3 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
6 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
10 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
13 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
16 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
20 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
23 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
26 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
30 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
33 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
36 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
40 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
\end{tabular}
\caption{NB-IoT / LTE-M measurements for message length = X B and added noise = X dBm}
\end{sidewaystable}
\begin{sidewaystable}
\centering
\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|c|c|}
\hline
\multicolumn{2}{|c|}{Nominal} &
\multicolumn{5}{c|}{nRF modem} &
\multicolumn{6}{c|}{Power Kit II} \\
\hline
$K_U$ & CL & $RSSI$ & $RSSI-2$ & $SNR$ & $T_{lat}$ & $PD$ & $P_{TX}$ & $P_{RX}$ & W & $T_{TX}$ & $T_{RX}$ & $R_B$ \\
[dB] & [dB] & [dBm] & [dBm] & [dB] & [ms] & [\%] & [mA] & [mA] & [J/msg] & [$\mu$ s] & [$\mu$ s] & [kB/s] \\\hline
0 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
3 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
6 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
10 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
13 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
16 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
20 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
23 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
26 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
30 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
33 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
36 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
40 & -140 & -80 & 10 & 40 & 0.5 & 0.1 & 98 & 10 & 0.1 & 400 & 400 & 1 \\ \hline
\end{tabular}
\caption{DECT-NR+ measurements for message length = X B and added noise = X dBm}
\end{sidewaystable}
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