Enhancement of System Capacity by Implementing Orthogonal Frequency Division Multiplexing (OFDM) in Wireless Digital Communication

Orthogonal Frequency Division Multiplexing (OFDM) is an important multiple access technology for very high-speed wireless digital communication systems. OFDM is a technique used to transmit large amounts of digital data through a wireless or wired medium using multiple carriers within a frequency band. OFDM has become increasingly popular due to its superior performance at high data rates and its ability to efficiently utilize limited frequency spectrum. It is being used for a variety of applications such as digital audio broadcasting (DAB), digital video broadcasting (DVB), and Wi-Fi. This paper discusses the fundamentals of OFDM and its implementation in wireless communication systems. It describes the formulation of OFDM, the modulation and demodulation process, the techniques used to reduce interference, the techniques used to reduce power consumption, and the various techniques used to mitigate inter-symbol interference (ISI). The paper concludes by presenting the current developments in this field and the challenges that need to be addressed.