List of PPDUs Supported in 802.11bn
========================================


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        **What is a PPDU in 802.11bn?**

        PPDU (Physical Layer Protocol Data Unit) is the physical layer packet transmitted over the air, containing preamble, header, and payload.

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        **What are the main components of an 802.11bn PPDU?**

        A preamble, PHY header, payload data, and tail bits.

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        **How does the 802.11bn PPDU differ from 802.11b and 802.11n PPDUs?**

        It supports coexistence of legacy 802.11b and newer 802.11n formats, combining protection and efficiency mechanisms.

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        **What types of preambles are used in 802.11bn PPDUs?**

        Legacy preamble, mixed-mode preamble, and greenfield preamble optimized for b/n coexistence.

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        **What is the purpose of the mixed-mode preamble in 802.11bn?**

        To maintain backward compatibility by including legacy preamble fields alongside HT fields.

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        **How does 802.11bn handle frame aggregation in PPDUs?**

        It supports A-MPDU and A-MSDU frame aggregation to improve throughput and reduce overhead.

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        **What is the maximum number of spatial streams supported in 802.11bn PPDUs?**

        Up to 4 spatial streams can be transmitted simultaneously.

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        **What modulation and coding schemes (MCS) are supported in 802.11bn PPDUs?**

        MCS indexes 0-31, supporting BPSK, QPSK, 16-QAM, and 64-QAM with various coding rates.

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        **What is the Greenfield PPDU format in 802.11bn?**

        A streamlined PPDU format without legacy support, optimized for pure 802.11n operation.

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        **How does coexistence with 802.11b devices affect the PPDU design?**

        Protection mechanisms like RTS/CTS and legacy preambles increase PPDU duration to avoid collisions.

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        **What is the function of the PHY header in 802.11bn PPDUs?**

        It conveys essential information for decoding such as rate, length, and format.

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        **What is the maximum PPDU length allowed in 802.11bn?**

        Up to 4 milliseconds, supporting large frame aggregations.

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        **How does channel bonding affect PPDU transmission in 802.11bn?**

        Bonding two 20 MHz channels into one 40 MHz channel increases data rates within the PPDU.

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        **What are tail bits in 802.11bn PPDUs?**

        Bits appended to flush the convolutional encoder to a known state at the end of transmission.

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        **How does Short Guard Interval (SGI) improve 802.11bn PPDU performance?**

        SGI reduces the guard interval to 400 ns, increasing throughput by decreasing inter-symbol spacing.

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        **Are 802.11b preambles supported within 802.11bn PPDUs?**

        Yes, to support legacy devices, legacy preambles are included when necessary.

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        **What is the significance of frame aggregation in 802.11bn PPDUs?**

        It reduces overhead and increases transmission efficiency by combining multiple frames into one PPDU.

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        **How does the receiver identify the PPDU format in 802.11bn?**

        The preamble and PHY header fields signal the PPDU type and decoding parameters.


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        Topics in this section,

                * :ref:`Reference links <ppdu_step17>`


.. _ppdu_step17:

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    .. tab-item:: Reference links
     
       * Reference links