OFDM (the underlying modulation) is robust to multipath because it uses a cyclic prefix to eliminate inter-symbol interference.
To achieve reliable communication, systems use several techniques:
Changes the height (amplitude) of the carrier wave to represent data.
Wireless communication systems face several challenges, including: wireless communications from the ground up pdf
A modern wireless device contains both a transmitter and a receiver, often integrated into a single transceiver chip.
Antennas convert electrical currents into EM waves and vice versa. While early devices used simple omnidirectional antennas, modern wireless systems rely heavily on .
300 MHz to 3 GHz; the sweet spot for Wi-Fi, Bluetooth, and cellular networks. OFDM (the underlying modulation) is robust to multipath
Antennas act as the transducers that convert electrical currents into electromagnetic waves.
Shifts the frequency up or down to distinguish between a
5G networks expanded beyond mobile broadband to support two new paradigms: Antennas convert electrical currents into EM waves and
An antenna is a transducer. It converts electrical currents in a wire into EM waves in the air, and vice versa. Types of Antennas
: Converts electrical signals into electromagnetic waves using an antenna.
From there, the book explains discrete-time and discrete-frequency domains in an intuitive manner, making the transition between them through the Discrete Fourier Transform (DFT) feel quite natural. Key concepts needed to implement modern digital communication systems—convolution, filters, and multirate signal processing—are illustrated through beautiful figures. The book then demystifies modulation and demodulation in a way that is easy to grasp even for a non-technical reader.
This insight drives the entire book’s design. A figure imprints a massive amount of parallel information in our brains that is much easier to process and recall later. Since the human mind handles images exceptionally well, Chaudhari visualizes equations through beautiful figures throughout the text, accompanied by logical and intuitive explanations. This is not a book where figures are an afterthought—they are central to the learning process, often conveying in a single image what would otherwise require several pages of dense mathematical derivation.