Posts in December 29, 2020

802.11ax introduce the use of Orthogonal Frequency Division Multiple Access (OFDMA) Allows the multiplexing of multiple users in the frequency domain. A departure from the use of the OFDM where all resources are assigned to a single user as in previous IEEE 802.11 amendments. Support of OFDMA is both for the Uplink (UL) and the Downlink (DL) Supporting Triggered UL MU MIMO DL MU MIMO support is already in IEEE 802.11ac. Allows multiplexing of multiple users in the spatial domain The use of 256 FFT (20 MHz Channel) for the data portion of the 802.11ax PPDU. A departure from the 64 FFT used in previous IEEE 802.11 amendments. Pre-defined resource unit (RU) sizes Four frame formats Allows Spatial Reuse MCS 10 and MCS 11 introducing 1024 QAM