List of PPDUs Supported in 802.11d
========================================


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

        PPDU stands for Physical Protocol Data Unit, the fundamental unit of transmission at the physical layer.

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        **How does a PPDU relate to a MAC frame?**

        A MAC frame is encapsulated within a PPDU for transmission over the wireless medium.

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        **Does 802.11d define new PPDU formats?**

        No, 802.11d primarily extends regulatory domain info; PPDU formats follow existing 802.11 standards.

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        **What are the main components of a PPDU?**

        Typically includes a preamble, signal field, and the data payload.

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        **What is the role of the preamble in a PPDU?**

        The preamble enables synchronization and channel estimation at the receiver.

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        **How does 802.11d impact PPDU transmission power?**

        802.11d mandates regulatory domain compliance which affects transmit power during PPDU transmission.

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        **Are there different PPDU types in 802.11 standards?**

        Yes, such as DSSS, OFDM, and ERP PPDUs, each used in different physical layer variants.

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        **Does 802.11d modify PPDU timing or duration?**

        No direct modifications; PPDU timing adheres to physical layer specifications.

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        **How does regulatory domain info affect channel selection for PPDU?**

        802.11d ensures PPDUs transmit only on allowed channels per the regulatory domain.

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        **What modulation schemes are used in PPDU transmission?**

        Modulation varies by standard and can include BPSK, QPSK, QAM, etc.

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        **Can PPDU formats differ between countries due to 802.11d?**

        PPDU formats remain consistent; however, transmit power and channels comply with local rules.

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        **What is the significance of the signal field in a PPDU?**

        It conveys rate and length information to help the receiver decode the data.

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        **Does 802.11d affect how retransmissions are handled at the PPDU level?**

        Retransmissions are managed by MAC and PHY layers, unaffected directly by 802.11d.

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        **How does PPDU size impact network performance?**

        Larger PPDUs carry more data but may increase error probability and latency.

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        **Are PPDUs encrypted or protected?**

        Encryption happens at MAC layer; PPDUs carry encrypted frames transparently.

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        **How does 802.11d ensure coexistence with other devices?**

        By defining allowed channels and power, 802.11d minimizes interference during PPDU transmissions.

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        **What is the relation between PPDU and throughput?**

        Efficient PPDU design and transmission optimize throughput within regulatory constraints.

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        **Where can I learn more about PPDU structures in 802.11?**

        Refer to IEEE 802.11 standard documents and physical layer technical references.

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        Topics in this section,

                * :ref:`Reference links <802_11d_ppdu_step17>`


.. _802_11d_ppdu_step17:

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