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Terahertz (THz)-band communications are a key enabler for future-generationwireless communications systems that promise to integrate a wide range ofdata-demanding applications. Recent advances in photonic, electronic, andplasmonic technologies are closing the gap in THz transceiver design.Consequently, prospect THz signal generation, modulation, and radiation methodsare converging, and corresponding channel model, noise, and hardware-impairmentnotions are emerging. Such progress establishes a foundation for well-groundedresearch into THz-specific signal processing techniques for wirelesscommunications. This tutorial overviews these techniques, emphasizingultra-massive multiple-input multiple-output (UM-MIMO) systems andreconfigurable intelligent surfaces, vital for overcoming the distance problemat very high frequencies. We focus on the classical problems of waveform designand modulation, beamforming and precoding, index modulation, channelestimation, channel coding, and data detection. We also motivate signalprocessing techniques for THz sensing and localization.

An Overview of Signal Processing Techniques for Terahertz Communications