36.406

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36.406 is part of the IEEE (Institute of Electrical and Electronics Engineers) 802.11ax standard. It is an amendment that defines procedures and formats for Enhanced 1024-QAM Multi-User MIMO (Multiple-Input Multiple-Output) transmission. The amendment is intended to improve the efficiency of data throughput and provide an enhanced network standard for WLANs (Wireless Local Area Networks).

The main applications of this amendment are wireless access networks and systems. This amendment is primarily applicable in WLANs with many users that require high bandwidth access. It is also suitable for applications such as HDTV, video streaming, Voice over IP (VoIP) and other high bandwidth multimedia applications. In addition, it can be used for IoT (Internet of Things) applications that require advanced features such as MIMO-OFDM (Orthogonal Frequency Division Multiplexing).

The enhanced features from this amendment consists of two primary features: Multi-User or Multi-X (MU-MIMO) and 1024-QAM. Multi-User or Multi-X (MU-MIMO) is a form of MIMO (Multiple-Input Multiple-Output) that enables multiple users to simultaneously access a certain amount of bandwidth on a single radio channel. This increases the effectiveness of the channel by reducing interference and by improving the efficiency of data throughput. Additionally, 1024-QAM is a higher order modulation scheme that is capable of transmitting more data in a given timeslot as compared to lower order modulation schemes such as 64-QAM and 16-QAM.

36.406 defines the physical layer (PHY) parameters that need to be present for the successful implementation of the Multi-User / Multi-X transmission. It also defines the protocols and formats that need to be followed for successful transmission and reception. Additionally, the amendment has also defined the channel bandwidths that are officially supported for the 802.11ax standard, such as 20MHz, 40MHz, 80MHz and 160MHz.

The working principle of 36.406 lies in the two features that have been defined in the amendment. Multi-User / Multi-X enables multiple users to simultaneously access a certain amount of bandwidth. This is achieved by splitting up the channels into multiple subchannels and allowing multiple users to access different amounts of one or more subchannels. This then reduces the channel contention, resulting in higher efficiency of data throughput.

1024-QAM is also a key feature in the 802.11ax standard, as it allows a larger amount of data to be transmitted in a given timeslot. This is achieved by encoding more information into a single data frame before transmission. Higher order modulation schemes such as 1024-QAM allow for greater data rates over a given channel bandwidth. Additionally, the advanced PHY protocols defined in the Amendment allow for efficient transmission in multiple-in multiple-out (MIMO) environments, making it suitable for applications such as HDTV and VoIP.

Finally, the amendment also defines the channel bandwidths that are officially supported for the 802.11ax standard. This includes 20MHz, 40MHz, 80MHz, and 160MHz. By increasing the channel bandwidths, the amendment enables a larger amount of data to be transmitted in a given amount of time. As a result, higher data rates can be achieved, making the enhanced features of the 802.11ax standard even more effective.

In summary, 36.406 is an amendment to the 802.11ax standard. It introduces two new features to further enhance the network standards for wireless access networks and systems: Multi-User / Multi-X (MU-MIMO) and 1024-QAM. The amendment defines the physical layer parameters and protocols, as well as the officially supported channel bandwidths. It also defines the working principles of the features, which include channel splitting for Multi-User / Multi-X and more efficient data encoding for 1024-QAM.

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