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High‐Density Communication (HDC) technologies include the extension of traditional technologies (e.g. Multi‐User Multiple‐Input[s] And Multiple‐Output[s] [MU‐MIMO] approaches, also sometimes known as Massive MIMO), as well as new or evolving technologies.¹ In this basic overview chapter, some of the underlying technologies and principles that are applicable to HDC in local environments are surveyed,² but the discussion is not focused per se on the high‐density specifics, which are covered in the chapters that follow.