List of PPDUs Supported in 802.11ad ======================================== .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What does PPDU stand for in 802.11ad?** PPDU stands for Physical Protocol Data Unit, which is the format of data frames sent over the physical layer. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How many types of PPDUs are defined in 802.11ad?** IEEE 802.11ad defines three main PPDU types: Control PHY, Single Carrier (SC) PHY, and Orthogonal Frequency Division Multiplexing (OFDM) PHY. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the Control PHY PPDU used for?** Control PHY is used for low-rate control messages and management frames to ensure robust communication. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What are Single Carrier (SC) PPDUs?** SC PPDUs use single carrier modulation schemes for data transmission, offering lower complexity and power consumption. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the purpose of OFDM PPDUs in 802.11ad?** OFDM PPDUs enable high data rates by dividing the channel into multiple subcarriers, providing robustness to multipath interference. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are all PPDU types compatible with each other?** Yes, 802.11ad devices support multiple PPDU types and can switch between them based on data rate and channel conditions. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What data rates are supported by Control PHY PPDUs?** Control PHY supports data rates up to 27.5 Mbps. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the maximum data rate achievable using OFDM PPDUs in 802.11ad?** OFDM PPDUs support data rates up to 6.7 Gbps. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does Single Carrier PHY compare to OFDM in 802.11ad?** SC PHY offers lower power and complexity but lower maximum data rates compared to OFDM PHY. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What modulation schemes are used in Single Carrier PPDUs?** SC PPDUs use BPSK, QPSK, 16-QAM, and 64-QAM modulation depending on link conditions. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How are PPDUs selected during communication?** Devices negotiate PPDU type during association and adapt dynamically based on channel quality and throughput requirements. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the role of the preamble in 802.11ad PPDUs?** The preamble helps in synchronization, channel estimation, and timing acquisition at the receiver. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are there different preamble formats for different PPDU types?** Yes, each PPDU type has a specific preamble structure optimized for its modulation scheme. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can 802.11ad devices switch between PPDUs mid-session?** Yes, devices can adapt PPDU types dynamically to optimize performance and reliability. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What coding techniques are used in 802.11ad PPDUs?** LDPC (Low-Density Parity-Check) codes are used for error correction in most PPDU types. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the shortest PPDU duration supported in 802.11ad?** The Control PHY allows very short PPDUs for control messages, often just a few microseconds. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does beamforming interact with PPDU types in 802.11ad?** Beamforming training and feedback are coordinated using Control PHY PPDUs, while data transmission uses SC or OFDM PPDUs. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are PPDU formats backward compatible with earlier 802.11 standards?** No, 802.11ad operates at 60 GHz with different PPDU formats and is not backward compatible with 2.4 or 5 GHz standards. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Where can I find detailed specifications of 802.11ad PPDU formats?** Detailed formats are defined in the IEEE 802.11ad standard document (IEEE Std 802.11-2012 and amendments). .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow Topics in this section, * :ref:`Learnings in this section ` * :ref:`Terminology ` * :ref:`Version Info ` * :ref:`ppdu Basic Setup on Ubuntu using IPv4 ` * :ref:`Reference links ` .. _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