Transmitting and receiving device and method in wireless communication system
Disclosed is a method for a station (STA) device transmitting data in a wireless local area network (WLAN) system. The method for transmitting data, according to one embodiment of the present invention, comprises the steps of: FEC encoding transmission data; constellation mapping the transmission data; inserting a pilot tone in the transmission data; performing Inverse Discrete Fourier Transform (IDFT) on the transmission data; and upconverting the transmission data and transmitting a transmission signal, wherein, if an Orthogonal Frequency Division Multiple Access (OFDMA) scheme is applied to the transmission signal, the transmission signal comprises at least one tone unit which is the unit of subcarrier allocation of the OFDMA scheme.
1. A data transmission method of a station (STA) apparatus in a wireless local area network (WLAN) system, the method comprising:
transmitting a transmission signal to an access point (AP) based on an orthogonal frequency division multiple access (OFDMA) scheme,
wherein the transmission signal comprises at least one resource-unit which is a basis for subcarrier allocation of the OFDMA scheme,
wherein each of the at least one resource-unit comprises a plurality of pilot subcarriers,
wherein positions of the plurality of pilot subcarriers are symmetrical with respect to a center frequency of the transmission signal, and
wherein the plurality of pilot subcarriers are equally spaced with each other.
2. The data transmission method of claim 1 ,
wherein a type of the at least one resource-unit is defined by a number of different subcarriers, and
wherein the at least one resource-unit corresponds to a first resource-unit having 26 subcarriers, a second resource-unit comprising 2 first resource-units, a third resource-unit comprising 4 first resource-units or a fourth resource-unit comprising 9 first resource-units.
3. The data transmission method of claim 2 , further comprising:
determining the positions of the plurality of pilot subcarriers in each of the at least one resource-unit,
wherein the positions of the plurality of pilot subcarriers in each of the at least one resource-unit are aligned with positions of a plurality of pilot subcarriers in each of a plurality of basic units, and
wherein positions of the plurality of pilot subcarriers of the second resource-unit, the third resource-unit, or the fourth resource-unit are aligned with positions of the plurality of pilot subcarriers of the first resource-units.
4. The data transmission method of claim 3 , wherein position indices of the pilot subcarriers of the second resource-units are the same as position indices of the pilot subcarriers of the first resource-units.
5. The data transmission method of claim 4 , wherein position indices of the pilot subcarriers of the third resource-unit and the fourth resource-unit are the same as position indices of the pilot subcarriers which are selected from the pilot subcarriers of the first resource-units.
6. The data transmission method of claim 4 , wherein the second resource-unit comprises 4 pilot subcarriers and position indices of the 4 pilot subcarriers are the same as position indices of 4 pilot subcarriers of the 2 first resource-units.
7. A station (STA) apparatus in a wireless local area network (WLAN) system, comprising:
a transceiver for transmitting and receiving a radio signal; and
a processor controlling the transceiver,
wherein the processor is configured to transmit a transmission signal to an access point (AP) based on an orthogonal frequency division multiple access (OFDMA) scheme,
wherein the transmission signal comprises at least one resource-unit which is a basis for subcarrier allocation of the OFDMA scheme,
wherein each of the at least one resource-unit comprises a plurality of pilot subcarriers,
wherein positions of plurality of the pilot subcarriers are symmetrical with respect to a center frequency of the transmission signal, and
wherein the plurality of the pilot subcarriers are equally spaced with each other.
8. The STA apparatus of claim 7 ,
wherein a type of the at least one resource-unit is defined by a number of different subcarriers, and
wherein the at least one resource-unit corresponds to a first resource-unit having 26 subcarriers, a second resource-unit comprising 2 first resource-units, a third resource-unit comprising 4 first resource-units or a fourth resource-unit comprising 9 first resource-units.
9. The STA apparatus of claim 8 ,
wherein the processor is configured to determine the positions of the plurality of pilot subcarriers in each of the at least one resource-unit,
wherein the positions of the plurality of pilot subcarriers in each of the at least one resource-unit are aligned with positions of a plurality of pilot subcarriers in each of a plurality of basic units,
wherein the positions of the plurality of pilot subcarriers of the second resource-unit, the third resource-unit, or the fourth resource-unit are aligned with positions of the plurality of pilot subcarriers of the first resource-units.
10. The STA apparatus of claim 9 , wherein position indices of the pilot subcarriers of the second resource-units are the same as position indices of the pilot subcarriers of the first resource-units.
11. The STA apparatus of claim 10 , wherein position indices of the pilot subcarriers of the third resource-unit and the fourth resource-unit are the same as position indices of the pilot subcarriers which are selected from the pilot subcarriers of the first resource-units.
12. The STA apparatus of claim 10 wherein the second resource-unit comprises 4 pilot subcarriers and position indices of the 4 pilot subcarriers are the same as position indices of 4 pilot subcarriers of the 2 first resource-units.