Patent ID: 9621311
Date: 2017-04-11
CPC Classifications: H04L,H04W

Claim:
1. A method of a wireless device for transmitting a frame, 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 a first RU of the frame at a first set of positions, respectively; providing, by the wireless device, a second plurality of pilots in a second RU of the frame at a second set of positions, respectively; and transmitting, by the wireless device, the frame, wherein the first set of positions is different from the second set of positions, 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 RU includes a lowest subcarrier having an odd-numbered index, wherein the second RU includes a lowest subcarrier having an even-numbered index, wherein the first RU is a 52-subcarrier RU and the second RU is a 52-subcarrier RU, wherein the first set of positions include a first pilot tone position spaced five subcarriers away from a lowest-indexed subcarrier of the first RU, a second pilot tone position separated by thirteen subcarriers from the first pilot tone position, a third pilot tone position separated by eleven subcarriers from the second pilot tone position, and a fourth pilot tone position separated by thirteen subcarriers from the third pilot tone position and spaced six subcarriers away from a highest-indexed subcarrier of the first RU, and wherein the second set of positions include a fifth pilot tone position spaced six subcarriers away from a lowest-indexed subcarrier of the first RU, a sixth pilot tone position separated by thirteen subcarriers from the fifth pilot tone position, a seventh pilot tone position separated by eleven subcarriers from the sixth pilot tone position, and an eighth pilot tone position separated by thirteen subcarriers from the seventh pilot tone position and spaced five subcarriers away from a highest-indexed subcarrier of the second RU.