| 主权项 |
1. A method for generating an orthogonal frequency division multiplexing (OFDM) physical layer (PHY) data unit for transmission via a communication channel, the method comprising:
generating a signal field of the data unit to include
a first subfield to indicate a number of streams used for transmission of the data unit, anda second subfield to indicate information regarding one of a plurality of modes for the data unit, including:
when the first subfield indicates a single stream is being used for transmission of the data unit, generating the second subfield to indicate whether a Doppler mode is being utilized for the data unit, wherein the second subfield does not provide information regarding a space time block code, andwhen the first subfield indicates multiple streams are being used for transmission of the data unit, generating the second subfield to indicate whether the space time block code is being utilized for the data unit, wherein the second subfield does not provide information regarding the Doppler mode; and generating the data unit to include a preamble and a data portion, wherein the signal field is included in the preamble, and wherein the data portion is generated according to mode information included in the second subfield. |
