PHYSICAL LAYER FRAME FORMAT FOR WLAN

摘要

In a method for generating a physical layer (PHY) data unit for transmission via a communication channel, the PHY data unit conforming to a first communication protocol, a first communication device generates a PHY preamble for the PHY data unit, including: generating a signal field, including the signal field and a duplicate of the signal field in the PHY preamble, and formatting the PHY preamble such that a first portion of the PHY preamble is decodable by a second communication device that conforms to a second communication protocol, but does not conform to the first communication protocol, to determine a duration of the PHY data unit based on the first portion of the PHY preamble. The first communication device generates the PHY data unit to include the PHY preamble and a PHY payload.