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; interleaving the transmission data; constellation mapping the transmission data; performing IDFT on the transmission data; and upconverting the transmission data and transmitting a transmission signal, wherein the transmission signal comprises a first part and a second part, and IDFT is performed using different FFT sizes for the first part and the second part.
1. A method for transmitting data in a wireless local area network (WLAN) system, the method performed by an access point (AP) and comprising:
forward error correction (FEC)-encoding the data;
interleaving the FEC-encoded data;
constellation mapping the interleaved data;
performing IDFT on the mapped data;
up-converting the data on which IDFT was performed; and
transmitting a signal including the up-converted data,
wherein the signal comprises a first portion and a second portion,
wherein the IDFT is performed on the first portion and the second portion using different FFT sizes,
wherein frequency resources of a data field of the second portion are individually allocated to each of a plurality of stations (STAs) by using a combination of a plurality of different types of resource units defined by a number of different subcarriers.
2. The method of claim 1 , wherein:
the first portion comprises a legacy-short training field (L-STF), a legacy-long training field (L-LTF), and a legacy-signaling (L-SIG) field; and
the second part portion comprises a data portion.
3. The method of claim 1 , wherein the first portion comprises a high efficiency signal A (HE-SIG-A) field and a high efficiency signal B (HE-SIG-B) field.
4. The method of claim 3 , wherein data of the HE-SIG-A field is duplicated in a 20 MHz channel bandwidth unit and transmitted if the signal is transmitted through a wide bandwidth channel.
5. The method of claim 3 , wherein data of the HE-SIG-B field is transmitted using a full wide bandwidth if the signal is transmitted through a wide bandwidth channel.
6. The method of claim 3 , wherein the HE-SIG-A field is interleaved in a 20 MHz bandwidth unit.
7. The method of claim 3 , wherein:
the HE-SIG-B field is segmented into frequency subblocks of a 20 MHz bandwidth; and
the frequency subblocks of the 20 MHz bandwidth are interleaved in a 20 MHz bandwidth unit.
8. The method of claim 3 , wherein the HE-SIG-A field comprises information related to a bandwidth of the transmitted signal.
9. The method of claim 1 , wherein an IDFT/DFT period of the second portion is four times an IDFT/DFT period of the first portion.
10. An access point (AP) device for transmitting data in a wireless local area network (WLAN) system, the AP device comprising:
a forward error correction (FEC) encoder FEC-encoding the data;
an interleaver interleaving the FEC-encoded data;
a mapper constellation mapping the interleaved data;
an IDFT unit performing IDFT on the mapped data; and
an analog/RF unit up-converting the data on which IDFT was performed and transmitting a signal including the up-converted data,
wherein the signal comprises a first portion and a second portion,
wherein the IDFT is performed on the first portion and the second portion using different FFT sizes,
wherein frequency resources of a data field of the second part are individually allocated to each of a plurality of stations (STAs) by using the combination of plurality of different types of resource units defined by a number of different subcarriers.
11. The AP device of claim 10 , wherein the first portion comprises a high efficiency signal A (HE-SIG-A) field and a high efficiency signal B (HE-SIG-B) field.
12. The AP device of claim 11 , wherein data of the HE-SIG-A field is duplicated in a 20 MHz channel bandwidth unit and transmitted if the signal is transmitted through a wide bandwidth channel.
13. The AP device of claim 11 , wherein data of the HE-SIG-B field is transmitted using a full wide bandwidth if the signal is transmitted through a wide bandwidth channel.
14. The AP device of claim 11 , wherein the HE-SIG-A field is interleaved in a 20 MHz bandwidth unit.
15. The AP device of claim 11 , further comprising a segment parser segmenting the HE-SIG-B field into frequency subblocks of a 20 MHz bandwidth and interleaving the frequency subblocks of the 20 MHz bandwidth in a 20 MHz bandwidth unit.
16. The AP device of claim 10 , wherein:
the first portion comprises a legacy-short training field (L-STF), a legacy-long training field (L-LTF), and a legacy-signaling (L-SIG) field; and
the second portion comprises a data part.
17. The AP device of claim 11 , wherein the HE-SIG-A field comprises information related to a bandwidth of the transmitted signal.
18. The AP device of claim 10 , wherein an IDFT/DFT period of the second portion is four times an IDFT/DFT period of the first portion.