Pilot transmission and reception for orthogonal frequency division multiple access

A wireless device for receiving a frame, the wireless device comprising:

• a processor;
• and
• a memory device coupled to the processor and storing instructions that when executed by the processor cause the wireless device to perform steps comprising:
• receiving, by the wireless device, a plurality of Resource Units (RUs) of the frame;
• extracting, by the wireless device, a first plurality of pilots from one or more RUs of the plurality RU at a first set of positions, respectively;
• and
• processing, by the wireless device, the frame using the first plurality of pilots,
• wherein the frame is an Orthogonal Frequency Division Multiple Access (OFDMA) frame and the plurality of RUs include respective pluralities of subcarriers,
• wherein the first set of positions are uniformly spaced,
• wherein a first RU is a 26-subcarrier RU and a second RU of the frame is a 52-subcarrier RU,
• wherein the first set of positions correspond to non-null positions of a Long Training field (LTF) of the frame, and
• wherein when the frame includes a 4× High Efficiency (HE) Long Training Field (HE-LTF), the first RU carries two pilots, and the second RU carries four pilots.

A method for transmitting a frame by a wireless device, the method comprising:

• determining, by the wireless device, a plurality of Resource Units (RUs) of the frame;
• providing, by the wireless device, a first plurality of pilots in one or more RUs of the plurality of RUs at a first set of positions, respectively;
• and
• transmitting, using a transmitter of the wireless device, the frame,
• wherein the frame is an Orthogonal Frequency Division Multiple Access (OFDMA) frame and the plurality of RUs include respective pluralities of subcarriers,
• wherein the first set of positions are uniformly spaced,
• wherein a first RU is a 26-subcarrier RU and a second RU of the frame is a 52-subcarrier RU,
• wherein the first set of positions correspond to non-null positions of a Long Training field (LTF) of the frame, and
• wherein when the frame includes a 4× High Efficiency (HE) Long Training Field (HE-LTF), the first RU carries two pilots, and the second RU carries four pilots.

A method for receiving a frame by a wireless device, the method comprising:

• receiving, using a receiver of the wireless device, a plurality of Resource Units (RUs) of the frame;
• extracting, by the wireless device, a first plurality of pilots from one or more RUs of the plurality RU at a first set of positions, respectively;
• and
• processing, by the wireless device, the frame using the first plurality of pilots,
• wherein the frame is an Orthogonal Frequency Division Multiple Access (OFDMA) frame and the plurality of RUs include respective pluralities of subcarriers,
• wherein the first set of positions are uniformly spaced,
• wherein a first RU is a 26-subcarrier RU and a second RU of the frame is a 52-subcarrier RU,
• wherein the first set of positions correspond to non-null positions of a Long Training field (LTF) of the frame, and
• wherein when the frame includes a 4× High Efficiency (HE) Long Training Field (HE-LTF), the first RU carries two pilots, and the second RU carries four pilots.