In this chapter, you will learn about the following:
Physical Layer Operations
Carrier Sense/Clear Channel Assessment(CS/CCA)
Transmit (Tx)
Receive (Rx)
Physical Layer
PLCP Service Data Unit
PLCP Protocol Data Unit
Physical Media Dependent
PLCP Protocol Data Unit
PLCP Preamble
Long PPDU Preamble
Short PPDU Preamble
OFDM PLCP Preamble
PLCP Header
802.11n PPDUs
Non-HT Legacy PPDU
HT Mixed PPDU
HT Greenfield PPDU
Data Field
2.4 GHz Communications
2.4 GHz Channels
5 GHz Communications
UNII-1 (Lower Band)
UNII-2 (Middle Band)
UNII-2 Extended
UNII-3 (Upper Band)
5 GHz Channels
Adjacent, Nonadjacent, and Overlapping Channels
Clause 14 FHSS PHY
Hopping Sequence
Dwell Time
Hop Time
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
Julian F.
Head of Cybersecurity
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.
Addison B.
Field Engineer
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.
Amir M.
Data Platform Tech Lead
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.