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+% SPDX-License-Identifier: CC-BY-SA-4.0
+%
+% Copyright (c) 2020 Philipp Le
+%
+% Except where otherwise noted, this work is licensed under a
+% Creative Commons Attribution-ShareAlike 4.0 License.
+%
+% Please find the full copy of the licence at:
+% https://creativecommons.org/licenses/by-sa/4.0/legalcode
+
+\chapter{Digital Signal Processing and Spread Spectrum}
+
+\begin{refsection}
+
+\todo{Implementation in CPU or ASIC/PLD}
+
+\section{Digital Filters}
+
+\todo{Digital Systems}
+
+\todo{IIR}
+
+\todo{Stability of IIR Filters}
+
+\todo{FIR}
+
+\section{Resampling}
+
+\todo{Downsampling, Decimation}
+
+\todo{Upsampling, Interpolation}
+
+\todo{Processing Gain}
+
+\todo{CIC filter}
+
+\section{Digital Mixer}
+
+\section{Fast Fourier Transform}
+
+\todo{FFT}
+
+\todo{IFFT}
+
+\section{Spread Spectrum}
+
+\todo{Purpose: Noise immunity}
+
+\todo{Purpose: Immunity against narrowband disturbances}
+
+\todo{Purpose: Coexistence with other services}
+
+\subsection{Direct-Sequence Spread Spectrum}
+
+\todo{Processing Gain}
+
+\subsection{Frequency-Hopping Spread Spectrum}
+
+\subsection{Time-Hopping Spread Spectrum}
+
+\section{Multi-carrier Modulation}
+
+\todo{OFDM}
+
+\phantomsection
+\addcontentsline{toc}{section}{References}
+\printbibliography[heading=subbibliography]
+\end{refsection}
+