What is OFDM?
In this video, we break down the concept of OFDM (Orthogonal Frequency Division Multiplexing)—a key technology behind Wi-Fi, 4G, and 5G networks. Learn how OFDM spreads digital data across multiple subcarriers, uses both sine and cosine waves to boost efficiency, and leverages mathematical orthogonality to avoid interference. From QAM to FFT and IFFT, discover how modern devices achieve fast data rates in a simple and intuitive way—perfect for beginners and tech enthusiasts alike.
▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
0:00 - Introduction
0:12 - OFDM = Extension of AM
0:28 - Digital Communication
0:59 - Concept of Subcarrier
1:12 - QAM modulation
1:48 - OFDMA
2:34 - Receiver decoding in Theory
3:15 - Orthogonality Property
4:15 - Transmitter implementation in Theory
4:33 - Transmitter implementation in Practice
5:57 - Math behind OFDM implementation
6:04 - Receiver implementation in Practice
6:48 - First Proposal of OFDM
Video upon QAM Modulation:
• What is QAM modulation?
Check out my blog for the same topic:
https://www.wirelessexplained.com/ofdm
First paper proposing OFDM:
“Synthesis of Band-Limited Orthogonal Signals for Multichannel Data Transmission” By ROBERT W. CHANG
https://ia802902.us.archive.org/14/it...
Music: Erik SATIE - Gymnopedies 1
#ofdm #communicationsystems #wirelesscommunication #QAM #4G #5G #transmitter #receiver #WirelessExplained