Digital communication systems are ubiquitous. Examples of digital communication systems include cell phones, Bluetooth, WiFi, and cable modems. This book explores in depth how these communication systems work and the fundamental limits on the performance of digital communication systems. We begin in this chapter with a high-level description of digital communication systems so as to understand the trade-offs in designing a communication system. We also explore the fundamental limits that can be achieved in terms of the data rate possible for a given bandwidth and the energy needed for a given level of noise.
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