Which 802.11 amendment introduced Orthogonal Frequency-Division Multiple Access (OFDMA) as a mechanism to improve spectral efficiency and minimize interference in high-density environments?
The correct answer requires knowledge of the specific technologies introduced in each Wi-Fi standard amendment. The IEEE 802.11ax amendment, known as WiFi 6, incorporates OFDMA which allows for the subdivision of channels into smaller frequencies to provide increased efficiency and capacity, particularly in environments with many devices, such as stadiums and public venues. The other listed amendments do not include OFDMA; for example, 802.11ac (WiFi 5) introduced MU-MIMO but not OFDMA, and 802.11n (WiFi 4) improved on MIMO techniques but also did not include OFDMA.