January 2018
Intermediate to advanced
524 pages
13h 33m
English
Content preview from Internet of Things for Architects
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IEEE 802.11 packet structure
802.11 uses the typical packet structure we have seen before with headers, payload data, frame identifiers, and so on. Starting with the PHY frame organization, we have three fields: a preamble, which assists in the synchronization phase, a PLCP header, which describes the packet configuration and characteristics such as data rates, and the MPDC MAC data.
Each IEEE 802.11 specification has a unique preamble and is structured by the number of symbols (described later) and not by the number of bits for each field. Examples of the preamble structures are as follows:
- 802.11 a/g: Preamble includes a short training field (two symbols) and a long training field (two symbols). These are used by the subcarriers for ...
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