Which Wi-Fi standard operates on the 2.4 GHz spectrum using OFDM?

The Wi-Fi standard that operates on the 2.4 GHz spectrum and utilizes Orthogonal Frequency Division Multiplexing (OFDM) is 802.11g. This standard was designed to provide higher data rates while maintaining compatibility with older standards.

While 802.11b also operates on the 2.4 GHz band, it utilizes a different modulation technique called Complementary Code Keying (CCK) for its higher data rates. In contrast, 802.11g employs OFDM, allowing it to achieve higher throughput and efficiency, making it more suitable for a variety of applications, including streaming media and larger data transfers.

802.11a operates in the 5 GHz band and uses OFDM, while 802.11n can operate on both the 2.4 GHz and 5 GHz bands, but it was developed later than 802.11g and introduced multiple-input multiple-output (MIMO) technology along with OFDM to improve performance. Therefore, although 802.11n does support the 2.4 GHz band and uses OFDM, the standard specifically recognized for OFDM operation solely in the 2.4 GHz band is 802.11g.