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| -rw-r--r-- | chapter02/content_ch02.tex | 4 | ||||
| -rw-r--r-- | exercise01/exercise01.tex | 2 |
2 files changed, 5 insertions, 1 deletions
diff --git a/chapter02/content_ch02.tex b/chapter02/content_ch02.tex index d596c93..dbcbf62 100644 --- a/chapter02/content_ch02.tex +++ b/chapter02/content_ch02.tex @@ -995,6 +995,8 @@ The constants can be moved in front of the integrals. \end{equation} \end{definition} +x + \begin{definition}{Integration of the Fourier transform} \begin{equation} \mathcal{F}\left\{\int\limits_{t'= -\infty}^{t} \underline{f}(t') \, \mathrm{d} t' \right\} = \frac{1}{j \omega} \underbrace{\underline{F} \left(j \omega\right)}_{= \mathcal{F}\left\{\underline{f}(t)\right\}} @@ -1002,6 +1004,8 @@ The constants can be moved in front of the integrals. \end{equation} \end{definition} +x + \begin{excursus}{Network analysis of reactive electrical circuits} Linear, reactive electrical networks are analysed using the Fourier transform. diff --git a/exercise01/exercise01.tex b/exercise01/exercise01.tex index a92da97..efaaadf 100644 --- a/exercise01/exercise01.tex +++ b/exercise01/exercise01.tex @@ -64,7 +64,7 @@ \end{solution} \begin{question}[subtitle={Frequency Allocation}] - An LTE (4G cell phone) signal can occupy a bandwidth of up to \SI{20}{MHz}. One of the bands allocated to LTE is, amongst others, the band 1 (uplink: \SIrange{1920}{1980}{MHz}, uplink: \SIrange{2110}{2170}{MHz}). The range of one LTE base station is a few kilometres. + An LTE (4G cell phone) signal can occupy a bandwidth of up to \SI{20}{MHz}. One of the bands allocated to LTE is, amongst others, the band 1 (uplink: \SIrange{1920}{1980}{MHz}, downlink: \SIrange{2110}{2170}{MHz}). The range of one LTE base station is a few kilometres. However, the HF band (\SIrange{3}{30}{MHz}) has the advantage that waves are reflected by the ionosphere and can propagate over longer distances or even across the whole world. Mostly, narrow-band services like AM broadcasting or amateur radio are allocated to the HF band. |