OFDM (Orthogonal Frequency Division Multiplexing) is a type of Multi-Carrier Modulation (MCM). It enables parallel transmission of high-speed serial data by utilizing frequency division multiplexing. This method is effective in combating multipath fading and supporting multiple users. The OFDM technology is a development of MCM and is one of the most widely applied multi-carrier transmission schemes. Its modulation and demodulation are implemented through IFFT and FFT, providing a low-complexity solution that is highly used in various applications.