An access point device and method for: generating and transmitting a physical layer protocol data unit (PPDU) including a plurality of resource units on a bandwidth, where the plurality of resource units includes a first tone unit and a second tone unit. The first tone unit includes a total of 26 tones, where 2 pilot tones for the first tone unit are included in the total of 26 tones. The second tone unit includes a plurality of tones being greater than the total of 26 tones. The 4 pilot tones for the second tone unit are included in the plurality of tones. The locations of a plurality of pilot tones for the plurality of resource units are fixed when two first tone units are included in the plurality of resource units in place of the second tone unit.