Method and device for applying phase rotation optimized for wide band in wireless LAN system
Proposed are a method and device for receiving a PPDU in a wireless LAN system. Specifically, a reception STA receives the PPDU from a transmission STA through a wide band, and decodes the PPDU. The PPDU includes a legacy preamble, and first and second signal fields. The legacy preamble and the first and second signal fields are generated on the basis of a first phase rotation value. When the wide band is the 320 MHz band, the first phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1 −1 1 1 1].
1. A method in a wireless local area network (WLAN) system, the method comprising:
receiving, by a receiving station (STA), a Physical Protocol Data Unit (PPDU) from a transmitting STA through a broadband; and
decoding, by the receiving STA, the PPDU,
wherein the PPDU includes a legacy preamble, first and second signal fields,
wherein the legacy preamble and the first and second signal fields are generated based on a first phase rotation value, and
wherein when the broadband is a 320 MHz band, the first phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1 −1 1 1 1].
2. The method of claim 1 , wherein the first phase rotation value is obtained based on a first preamble puncturing pattern of the broadband,
wherein the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the broadband.
3. The method of claim 1 , wherein the broadband includes first to fourth 80 MHz bands,
wherein the first preamble puncturing pattern includes first to eighth patterns,
wherein the first pattern is a pattern in which a 40 MHz band within the first 80 MHz band in the broadband is punctured,
wherein the second pattern is a pattern in which a 40 MHz band within the second 80 MHz band in the broadband is punctured,
wherein the third pattern is a pattern in which a 40 MHz band within the third 80 MHz band in the broadband is punctured,
wherein the fourth pattern is a pattern in which a 40 MHz band within the fourth 80 MHz band in the broadband is punctured,
wherein the fifth pattern is a pattern in which the first 80 MHz band is punctured in the broadband,
wherein the sixth pattern is a pattern in which the second 80 MHz band is punctured in the broadband,
wherein the seventh pattern is a pattern in which the third 80 MHz band is punctured in the broadband,
wherein the eighth pattern is a pattern in which the fourth 80 MHz band is punctured in the broadband.
4. The method of claim 1 , wherein one element of the first phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band,
wherein the 320 MHz band consists of subcarriers having subcarrier indexes from −512 to 511,
wherein a first 1 of the first phase rotation values is applied to subcarriers having a subcarrier index of −512 to −449,
wherein a second −1 of the first phase rotation value is applied to subcarriers having a subcarrier index of −448 to −385,
wherein a third −1 of the first phase rotation value is applied to subcarriers having subcarrier indices from −384 to −321,
wherein a fourth −1 of the first phase rotation value is applied to subcarriers having subcarrier indexes from −320 to −257,
wherein a fifth 1 of the first phase rotation values is applied to a subcarrier having a subcarrier index of −256 to −193,
wherein a sixth −1 of the first phase rotation values is applied to subcarriers having subcarrier indices from −192 to −129,
wherein a seventh −1 of the first phase rotation values is applied to subcarriers having a subcarrier index of −128 to −65,
wherein an eighth −1 of the first phase rotation values is applied to subcarriers having a subcarrier index of −64 to −1,
wherein a ninth 1 of the first phase rotation values is applied to subcarriers having subcarrier indexes from 0 to 63,
wherein a tenth −1 of the first phase rotation values is applied to subcarriers having subcarrier indexes from 64 to 127,
wherein an eleventh −1 of the first phase rotation values is applied to subcarriers having subcarrier indexes from 128 to 191,
wherein a twelfth −1 of the first phase rotation values is applied to subcarriers having a subcarrier index of 192 to 255,
wherein a thirteenth −1 among the first phase rotation values is applied to subcarriers having subcarrier indices from 256 to 319,
wherein a fourteenth 1 of the first phase rotation values is applied to subcarriers having subcarrier indices from 320 to 383,
wherein a fifteenth 1 of the first phase rotation values is applied to subcarriers having subcarrier indices from 384 to 447,
wherein a sixteenth 1 of the first phase rotation values is applied to subcarriers having subcarrier indices 448 to 511.
5. The method of claim 1 , wherein the legacy preamble includes a Legacy-Short Training Field (L-STF), a Legacy-Long Training Field (L-LTF) and a Legacy-Signal (L-SIG),
wherein the first phase rotation value is generated based on a second phase rotation value and a third phase rotation value,
wherein the second phase rotation value is a phase rotation value in which the phase rotation value for the 80 MHz band defined in the 802.11ax wireless LAN system is repeated,
wherein the third phase rotation value is a phase rotation value defined in units of 80 MHz bands to obtain an optimal Peak-to-Average Power Ratio (PAPR) of the L-SIG,
wherein the optimal PAPR of the L-SIG is obtained based on a combination of RF (Radio Frequency) used when transmitting the PPDU,
wherein the combination of the RF includes a combination of two RFs with 160 MHz capability or one RF with 320 MHz capability.
6. The method of claim 5 , wherein the second phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1],
wherein the third phase rotation value is [1 1 1 −1],
wherein the first phase rotation value is obtained based on a product of the second phase rotation value and the third phase rotation value.
7. The method of claim 6 , wherein a first element 1 of the third phase rotation value is applied to the first 80 MHz band;
wherein a second element 1 of the third phase rotation value is applied to the second 80 MHz band;
wherein a third element 1 of the third phase rotation value is applied to the third 80 MHZ band,
wherein a fourth element −1 of the third phase rotation value is applied to the fourth 80 MHz band.
8. The method of claim 1 , wherein the first signal field is a Universal-Signal (U-SIG), the second signal field is an Extremely High Throughput-Signal (EHT-SIG),
wherein the first signal field includes information on the first preamble puncturing pattern.
9. A receiving station (STA) in a wireless local area network (WLAN) system, the receiving STA comprising:
a memory;
a transceiver; and
a processor being operatively connected to the memory and the transceiver,
wherein the processor is configured to:
receive a Physical Protocol Data Unit (PPDU) from a transmitting station (STA) through a broadband, and
decode the PPDU,
wherein the PPDU includes a legacy preamble, first and second signal fields,
wherein the legacy preamble and the first and second signal fields are generated based on a first phase rotation value, and
wherein when the broadband is a 320 MHz band, the first phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1 −1 1 1 1].
10. A method in a wireless local area network (WLAN) system, the method comprising:
generating, by a transmitting station (STA), a Physical Protocol Data Unit (PPDU); and
transmitting, by the transmitting STA, the PPDU to a receiving STA through a broadband,
wherein the PPDU includes a legacy preamble, first and second signal fields,
wherein the legacy preamble and the first and second signal fields are generated based on a first phase rotation value, and
wherein when the broadband is a 320 MHz band, the first phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1 −1 1 1 1].
11. The method of claim 10 , wherein the first phase rotation value is obtained based on a first preamble puncturing pattern of the broadband,
wherein the first preamble puncturing pattern includes a pattern in which a 40 MHz or 80 MHz band is punctured in the broadband.
12. The method of claim 11 , wherein the broadband includes first to fourth 80 MHz bands,
wherein the first preamble puncturing pattern includes first to eighth patterns,
wherein the first pattern is a pattern in which a 40 MHz band within the first 80 MHz band in the broadband is punctured,
wherein the second pattern is a pattern in which a 40 MHz band within the second 80 MHz band in the broadband is punctured,
wherein the third pattern is a pattern in which a 40 MHz band within the third 80 MHz band in the broadband is punctured,
wherein the fourth pattern is a pattern in which a 40 MHz band within the fourth 80 MHz band in the broadband is punctured,
wherein the fifth pattern is a pattern in which the first 80 MHz band is punctured in the broadband,
wherein the sixth pattern is a pattern in which the second 80 MHz band is punctured in the broadband,
wherein the seventh pattern is a pattern in which the third 80 MHz band is punctured in the broadband,
wherein the eighth pattern is a pattern in which the fourth 80 MHz band is punctured in the broadband.
13. The method of claim 10 , wherein one element of the first phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band,
wherein the 320 MHz band consists of subcarriers having subcarrier indexes from −512 to 511,
wherein a first 1 of the first phase rotation values is applied to subcarriers having a subcarrier index of −512 to −449,
wherein a second −1 of the first phase rotation value is applied to subcarriers having a subcarrier index of −448 to −385,
wherein a third −1 of the first phase rotation value is applied to subcarriers having subcarrier indices from −384 to −321,
wherein a fourth −1 of the first phase rotation value is applied to subcarriers having subcarrier indexes from −320 to −257,
wherein a fifth 1 of the first phase rotation values is applied to a subcarrier having a subcarrier index of −256 to −193,
wherein a sixth −1 of the first phase rotation values is applied to subcarriers having subcarrier indices from −192 to −129,
wherein a seventh-1 of the first phase rotation values is applied to subcarriers having a subcarrier index of −128 to −65,
wherein an eighth −1 of the first phase rotation values is applied to subcarriers having a subcarrier index of −64 to −1,
wherein a ninth 1 of the first phase rotation values is applied to subcarriers having subcarrier indexes from 0 to 63,
wherein a tenth −1 of the first phase rotation values is applied to subcarriers having subcarrier indexes from 64 to 127,
wherein an eleventh −1 of the first phase rotation values is applied to subcarriers having subcarrier indexes from 128 to 191,
wherein a twelfth −1 of the first phase rotation values is applied to subcarriers having a subcarrier index of 192 to 255,
wherein a thirteenth −1 among the first phase rotation values is applied to subcarriers having subcarrier indices from 256 to 319,
wherein a fourteenth 1 of the first phase rotation values is applied to subcarriers having subcarrier indices from 320 to 383,
wherein a fifteenth 1 of the first phase rotation values is applied to subcarriers having subcarrier indices from 384 to 447,
wherein a sixteenth 1 of the first phase rotation values is applied to subcarriers having subcarrier indices 448 to 511.
14. The method of claim 10 , wherein the legacy preamble includes a Legacy-Short Training Field (L-STF), a Legacy-Long Training Field (L-LTF) and a Legacy-Signal (L-SIG),
wherein the first phase rotation value is generated based on a second phase rotation value and a third phase rotation value,
wherein the second phase rotation value is a phase rotation value in which the phase rotation value for the 80 MHz band defined in the 802.11ax wireless LAN system is repeated,
wherein the third phase rotation value is a phase rotation value defined in units of 80 MHz bands to obtain an optimal Peak-to-Average Power Ratio (PAPR) of the L-SIG,
wherein the optimal PAPR of the L-SIG is obtained based on a combination of RF (Radio Frequency) used when transmitting the PPDU,
wherein the combination of the RF includes a combination of two RFs with 160 MHz capability or one RF with 320 MHz capability.
15. The method of claim 14 , wherein the second phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1],
wherein the third phase rotation value is [1 1 1 −1],
wherein the first phase rotation value is obtained based on a product of the second phase rotation value and the third phase rotation value.
16. The method of claim 15 , wherein a first element 1 of the third phase rotation value is applied to the first 80 MHz band;
wherein a second element 1 of the third phase rotation value is applied to the second 80 MHz band;
wherein a third element 1 of the third phase rotation value is applied to the third 80 MHz band,
wherein a fourth element −1 of the third phase rotation value is applied to the fourth 80 MHz band.
17. The method of claim 10 , wherein the first signal field is a Universal-Signal (U-SIG), the second signal field is an Extremely High Throughput-Signal (EHT-SIG),
wherein the first signal field includes information on the first preamble puncturing pattern.