Patent ID: 8867653

Claim:
A method for generating a physical layer (PHY) data unit for transmission via a communication channel, wherein the communication channel includes a plurality of spatial streams, the method comprising: generating a first preamble portion of the PHY data unit, wherein the first preamble portion includes one or more long training fields, and wherein at least one of the one or more long training fields includes at least pilot tones and non-pilot tones; generating a data portion of the PHY data unit; modulating the first preamble portion and the data portion to generate a plurality of orthogonal frequency division multiplexing (OFDM) symbols, wherein symbol duration of each OFDM symbol of the plurality of OFDM symbols is at least 8 μs; generating the PHY data unit to include the plurality of OFDM symbols; mapping the non-pilot tones to the plurality of spatial streams using a mapping matrix; and mapping the pilot tones to the plurality of spatial streams using a column of the mapping matrix.