At its core, wireless communication is the transmission of information using electromagnetic (EM) waves. When an alternating current passes through an antenna, it generates a propagating electric and magnetic field – a radio wave. Key properties include:
Different frequency bands have different propagation characteristics: lower frequencies (e.g., AM radio, 500 kHz–1.6 MHz) diffract around obstacles and travel long distances; higher frequencies (e.g., 5 GHz Wi-Fi) carry more data but are easily blocked by walls. wireless communications from the ground up pdf
Used in 4G, 5G, and Wi-Fi 6, OFDM is explained as a clever trick to turn a “bad” frequency-selective channel into many “good” flat channels using the Fast Fourier Transform (FFT). At its core, wireless communication is the transmission
A typical high-quality PDF resource under this title covers the following essential modules. Receiver:
A typical wireless transceiver, built from the ground up, includes:
Transmitter:
Receiver: