FFTsize
4
-
1
}
.
For tone-select mode 2 with FFTsize=256, set 1 includes tone indices {0, 2, 4, . . . , 254} and set 2 includes tone indices {1, 3, 5, . . . , 255}. For tone-select mode 4 in 4×HE-LTF mode, the number of tones available are not divided. This follows the current IEEE 802.11ax definition of HE-LTF. Using the 8×8 P-matrix defined for IEEE 802.11ax, up to 8 streams are supported in tone-select mode 4, up to 16 streams are supported in tone-select mode 2, and up to 32 streams are supported in tone-select mode 1 (i.e., 8 streams for each of the four sets).
The number of streams to be transmitted by transmitter 102 are, in some embodiments, divided among the sets. In each set, at least
streams are present, where m denotes a tone-select mode (e.g., m=1, 2, or 4). The remaining streams,