Abstract : Orthogonal Frequency Division Multiplexing (OFDM) is a core technology of fourth-generation mobile communication and the foundation for the development of broadband wireless communication and multimedia services. This paper studies the basic principles, key technologies, and implementation of OFDM. Furthermore, the OFDM system was simulated and analyzed using Simulink, a communication simulation system in MATLAB. The transmission performance of the OFDM system in the time and frequency domains was obtained intuitively and vividly. The results show that the OFDM system can significantly resist frequency-selective fading caused by multipath effects and improve spectral efficiency. This characteristic enables it to exert its advantages in high-data-rate wireless channels. Keywords : OFDM; SIMULINK; subcarrier; serial-to-parallel conversion 1 Introduction Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier parallel modulation technique. It uses multiple subcarriers to divide the channel into many sub-channels, uniformly distributing baseband symbols to modulate the carrier of each sub-channel. Information is transmitted using multiple orthogonal subcarrier bundles, resulting in high spectral efficiency and good resistance to multipath interference. It is now widely used in Asymmetric Digital Subscriber Line (ADSL), Digital Video Broadcasting (DVB), High-Definition Television (HDTV), and Wireless Local Area Networks (WLAN). IEEE WLAN standards 802.11a and 80.216a both use it as their physical layer standard, and it is one of the core technologies of fourth-generation mobile communication. [Full text download of "Research and Analysis of OFDM Technology Based on Simulink"]