Abstract
This chapter presents an overview on the principles of digital communications. We focus on a system with one transmitter and one receiver, i.e., for a channel with a single input single output (SISO). This will also provide the necessary basics for multiple input multiple output (MIMO) systems investigated in Part III. Depending on the characteristics of the transmission medium, we have to differentiate between a wire-line and a wireless connection. Both channel types exhibit different properties and therefore will be treated separately. We start with the wire-line transmission link and in Chap. 5 the wireless system will be discussed in detail.
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Notes
- 1.
In case of a baseband transmission system with a lowpass channel, no modulation is required, thus we set \(f_{0}=0\). Figure 1.1 still holds, wherein the modulator, the real-part operator \({\text {Re}}[...]\), the demodulator, and the gain factors \(\sqrt{2}\) are dropped. All signals including the symbols a(k) take on real values only.
- 2.
sometimes referred to as “equivalent baseband (or lowpass) channel”.
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Speidel, J. (2019). Transmission System with Quadrature Amplitude Modulation. In: Introduction to Digital Communications. Signals and Communication Technology. Springer, Cham. https://doi.org/10.1007/978-3-030-00548-1_1
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DOI: https://doi.org/10.1007/978-3-030-00548-1_1
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