Long training field sequence construction

A method for facilitating wireless communication, comprising:

• selecting, by a wireless device based on a channel bandwidth of a frame, a high efficiency long training field (HE-LTF) sequence for the frame, wherein the channel bandwidth is divided into a plurality of resource units (RUs), wherein each RU in a set of RUs is allocated to a station (STA) in a set of STAs for the frame, wherein the HE-LTF sequence is associated with the allocated RUs;
• selecting an HE-LTF transmission mode from one of a 4× HE-LTF mode, a 2× HE-LTF mode, and a 1× HE-LTF mode;
• transmitting, by the wireless device to the set of STAs, the HE-LTF sequence;
• and
• transmitting, by the wireless device to the set of STAs, a set of additional fields of the frame using the set of allocated RUs and a set of unallocated RUs, the set of additional fields including a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signaling field (L-SIG), a high efficiency signaling A field (HE-SIG-A), and a high efficiency short training field (HE-STF),
• wherein the wireless device transmits the HE-LTF sequence with-one or more allocated RUs and none of the unallocated RUs.

A non-transitory machine-readable storage medium that stores instructions, that when executed by one or more processors of a wireless device, cause the wireless device to perform:

• selecting, based on a channel bandwidth of a frame, a high efficiency long training field (HE-LTF) sequence for the frame, wherein the channel bandwidth is divided into a plurality of resource units (RUs), wherein each RU in a set of RUs is allocated to a station (STA) in a set of STAs for the frame, wherein the HE-LTF sequence is associated with the allocated RUs;
• selecting an HE-LTF transmission mode from one of a 4× HE-LTF mode, a 2× HE-LTF mode, and a 1× HE-LTF mode;
• transmitting to the set of STAs, the HE-LTF sequence;
• and
• transmitting to the set of STAs, a set of additional fields of the frame using the set of allocated RUs and a set of unallocated RUs, the set of additional fields including a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signaling field (L-SIG), a high efficiency signaling A field (HE-SIG-A), and a high efficiency short training field (HE-STF),
• wherein the wireless device transmits the HE-LTF sequence with-one or more allocated RUs and none of the unallocated RUs.