OFDMA (Orthogonal Frequency Division Multiple Access) is a modulation technique used in modern mobile networks, particularly in 4G and 5G. It enables high-speed, high-capacity, and low-latency requirements of modern mobile communications.

OFDMA is a multiple access technique that allows multiple users to share the same frequency band simultaneously.

It works by dividing the available frequency spectrum into multiple narrow-band subcarriers, and allocating them to different users. The subcarriers are designed to be orthogonal to each other, which means they do not interfere with each other, enabling efficient use of the spectrum.

This results in increased spectrum efficiency, improved data rates, and enhanced reliability.