List of PPDUs Supported in 802.11b
========================================


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

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

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        **What are the main components of the 802.11b PPDU?**

        The PPDU consists of a preamble, a header (PLCP header), and a PSDU (the MAC frame payload).

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

        The preamble is used for synchronization, signal detection, and channel estimation.

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        **How long is the preamble in 802.11b PPDU?**

        The preamble duration is typically 144 microseconds in long preamble mode.

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        **What is the PLCP header in 802.11b?**

        The Physical Layer Convergence Protocol (PLCP) header contains information about the data rate and length of the PSDU.

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        **What modulation techniques does 802.11b PPDU use?**

        It uses Direct Sequence Spread Spectrum (DSSS) and Complementary Code Keying (CCK) for different data rates.

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        **What data rates does 802.11b PPDU support?**

        It supports 1, 2, 5.5, and 11 Mbps data rates.

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        **How is the length of the PSDU specified in the PPDU?**

        The PLCP header includes a length field indicating the number of bytes in the PSDU.

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        **What is the difference between long and short preamble in 802.11b?**

        Short preamble reduces the preamble time to 72 microseconds to increase efficiency but requires compatible devices.

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        **How does the receiver use the PPDU preamble?**

        The receiver uses it to synchronize its clock and prepare for demodulation of the incoming data.

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        **What is the PSDU in the context of PPDU?**

        The Physical Layer Service Data Unit (PSDU) contains the MAC frame data that is transmitted.

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

        Error detection is primarily handled at the MAC layer via CRC, but PHY layer coding helps reduce errors.

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        **Are there any optional fields in the 802.11b PPDU?**

        The preamble can be long or short; short preamble is optional and used for better efficiency.

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        **What role does the PLCP header play in rate adaptation?**

        It signals the data rate so the receiver can correctly demodulate the incoming signal.

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        **Can 802.11b PPDU support simultaneous data rates?**

        No, each PPDU is transmitted at a single data rate specified in the PLCP header.

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        **How does the PPDU structure affect wireless throughput?**

        Longer preambles increase overhead, reducing throughput, whereas short preambles improve efficiency.

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        **Is the 802.11b PPDU compatible with other 802.11 standards?**

        The PPDU structure differs from 802.11a/g/n due to different modulation and PHY layer characteristics.

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        **What physical layer coding does 802.11b use in the PPDU?**

        Uses Barker code spreading for 1 and 2 Mbps, and CCK for 5.5 and 11 Mbps rates.

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        **How does the PPDU relate to overall 802.11b frame transmission?**

        The PPDU encapsulates MAC frames for physical transmission over the wireless medium.



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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