List of PPDUs Supported in 802.11a
========================================



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        **What does PPDU stand for in 802.11a?**

        PPDU stands for Physical Layer Protocol Data Unit, which is the unit of data exchanged at the physical layer.

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        **How many types of PPDUs does 802.11a support?**

        802.11a supports one main PPDU type based on OFDM modulation.

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        **What modulation technique is used in 802.11a PPDUs?**

        Orthogonal Frequency Division Multiplexing (OFDM).

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        **What are the data rates supported by 802.11a PPDUs?**

        6, 9, 12, 18, 24, 36, 48, and 54 Mbps.

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        **What fields are present in the 802.11a PPDU?**

        Preamble, Signal, and Data fields.

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        **What is the purpose of the preamble in 802.11a PPDU?**

        It allows synchronization, channel estimation, and automatic gain control.

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        **How long is the preamble in 802.11a?**

        16 microseconds.

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        **What is the Signal field in 802.11a PPDU?**

        It contains information about the data rate and length of the payload.

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        **What modulation does the Signal field use?**

        BPSK with rate 1/2 coding.

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        **What is the Data field in 802.11a PPDU?**

        The actual payload data, modulated according to the selected data rate.

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        **Are there different PPDU formats for control and management frames in 802.11a?**

        Control frames generally use a different, simpler format but still conform to the overall PPDU structure.

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        **Is there a Short Preamble PPDU format in 802.11a?**

        No, the short preamble is defined in 802.11b but not in 802.11a.

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        **What is the symbol duration in 802.11a PPDU?**

        4 microseconds.

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        **How many OFDM subcarriers are used in 802.11a PPDU?**

        52 subcarriers: 48 data and 4 pilot carriers.

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        **What error correction coding is used in 802.11a PPDU?**

        Convolutional coding with rates 1/2, 2/3, and 3/4.

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        **Does 802.11a support multiple PPDU formats?**

        No, 802.11a uses a single OFDM-based PPDU format.

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        **What is the maximum PPDU length in 802.11a?**

        The maximum MPDU size is 2304 bytes, which affects PPDU length.

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        **How does the PPDU format affect data rate?**

        The modulation and coding scheme specified in the PPDU determines the data rate.

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        **Are the PPDU formats backward compatible with earlier 802.11 standards?**

        No, 802.11a PPDU is not compatible with DSSS/CCK used in 802.11b/g.

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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