List of PPDUs Supported in 802.11ax
========================================


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        **What is a PPDU in IEEE 802.11ax?**

        PPDU stands for Physical Protocol Data Unit; it is the physical layer frame used to transmit data over the wireless medium.

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        **How does the 802.11ax PPDU differ from earlier standards?**

        802.11ax introduces new PPDU formats to support OFDMA, MU-MIMO, and longer OFDM symbols for improved efficiency.

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

        Typical components include a Legacy Preamble, High Efficiency (HE) Preamble, SIGNAL fields, Data payload, and a CRC.

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        **What is the role of the HE-SIG-A field in 802.11ax PPDU?**

        HE-SIG-A conveys information about resource allocation and transmission parameters for OFDMA and MU-MIMO.

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        **What modulation schemes are used in 802.11ax PPDUs?**

        802.11ax supports up to 1024-QAM modulation for higher data rates.

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        **How does OFDMA affect the PPDU structure?**

        OFDMA divides the frequency spectrum into Resource Units (RUs), with signaling fields indicating RU allocations in the PPDU.

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        **What is the purpose of the Legacy Preamble in 802.11ax PPDU?**

        It ensures backward compatibility with legacy devices by providing recognizable signals.

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        **What are the different PPDU types in 802.11ax?**

        They include HE SU PPDU, HE MU PPDU, HE Trigger-based PPDU, and HE Extended Range PPDU.

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        **How does 802.11ax PPDU handle multi-user transmissions?**

        By using HE MU and Trigger-based PPDUs with resource allocation info in signaling fields.

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        **What is the HE-LTF field in 802.11ax PPDU?**

        HE-LTF (High Efficiency Long Training Field) is used for channel estimation and synchronization.

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        **Does 802.11ax support longer OFDM symbol durations?**

        Yes, symbol duration can be extended to improve range and robustness.

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        **How does 802.11ax PPDU improve spectral efficiency?**

        Through OFDMA, MU-MIMO, higher modulation, and flexible resource allocation within the PPDU.

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        **What is the difference between HE-SIG-A and HE-SIG-B fields?**

        HE-SIG-A provides common signaling for all users; HE-SIG-B carries user-specific information in MU transmissions.

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        **How does PPDU format support both uplink and downlink transmissions?**

        Different PPDU formats and trigger-based transmissions coordinate uplink and downlink multi-user access.

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        **Are there any changes in PPDU preamble lengths in 802.11ax?**

        Yes, HE PPDU preambles are longer to accommodate additional signaling fields.

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        **How is error detection handled in 802.11ax PPDU?**

        Error detection uses CRC fields within the PPDU to ensure data integrity.

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        **Can the PPDU format adapt to different channel widths?**

        Yes, 802.11ax supports 20, 40, 80, and 160 MHz channels, with PPDU adapting accordingly.

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        **Where can I learn more about 802.11ax PPDU specifications?**

        The IEEE 802.11ax standard documents and related technical papers provide detailed PPDU format descriptions.


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        Topics in this section,

                * :ref:`Learnings in this section <ppdu_step1>`

                * :ref:`Terminology <ppdu_step2>`

                * :ref:`Version Info <ppdu_step3>`
 
                * :ref:`ppdu Basic Setup on Ubuntu using IPv4 <ppdu_step18>`

                * :ref:`Reference links <ppdu_step17>`

.. _ppdu_step1:

.. tab-set::

    .. tab-item:: Learnings in this section

        * In this section, you are going to learn

.. _ppdu_step2:

.. tab-set::

    .. tab-item:: Terminology
        
       * Terminology


.. _ppdu_step3:

.. tab-set::

    .. tab-item:: Version Info
    
         * Version Info


.. _ppdu_step18:

.. tab-set::

    .. tab-item:: ppdu Basic Setup on Ubuntu using IPv4

       * setup


.. _ppdu_step17:

.. tab-set::

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