| 主权项 |
1. A method for generating a data unit for transmission via a communication channel, the method comprising:
determining, at a network interface of a communication device, whether the data unit is to be transmitted using single carrier (SC) modulation or using orthogonal frequency division (OFDM) modulation; generating, at the network interface of the communication device, a header field to be included in a preamble of the data unit, including
when it is determined that the data unit is to be transmitted using SC modulation, generating the header field using a first technique to indicate one or both of (i) that the data unit conforms to a first communication protocol and not a second communication protocol and (ii) whether the data unit conforms to a first PHY mode of the first communication protocol or a second PHY mode of the first communication protocol, andwhen it is determined that the data unit is to be transmitted using OFDM modulation, generating the header field using a second technique to indicate one or both of (i) that the data unit conforms to the first communication protocol and not the second communication protocol and (ii) whether the data unit conforms to the first PHY mode of the first communication protocol or the second PHY mode of the first communication protocol; generating, at the network interface of the communication device, the preamble of the data unit to include at least the header field, and generating, at the network interface of the communication device, the data unit to include at least the preamble. |
