Method and apparatus for receiving PPDU via broadband in wireless LAN system
Proposed are a method and apparatus for receiving PPDU in a wireless LAN system. Specifically, a receiving STA receives a PPDU from a transmitting STA via broadband and decodes the PPDU. The broadband is a 320 MHz or 160+160 MHz bandwidth that is not preamble punctured. The PPDU includes a first field and a second field. The first field includes L-LTF. The PPDU includes a first signal field and a second signal field. The first field includes L-LTF. The first field is generated on the basis of one of a first, second, third or fourth phase rotation value. The first phase rotation value is a phase rotation value that obtains PAPR of the L-LTE optimized for the broadband on the basis of a first combination of RFs used for transmitting the PPDU. The first combination of RFs is a combination of 160 MHz-capable RFs or 320 MHz-capable RFs.
1. A method in a wireless LAN system, the method comprising:
receiving a Physical Protocol Data Unit (PPDU) by a receiving station (STA) from a transmitting STA through a broadband; and
decoding the PPDU by the receiving STA,
wherein the broadband is a 320 MHz band or a 160+160 MHz band without preamble puncturing,
the PPDU includes a first field and a second field,
the first field includes a Legacy-Long Training Field (L-LTF),
the first field is generated based on one of a first, second, third, or fourth phase rotation values,
the first phase rotation value is a phase rotation value for obtaining Peak-to-Average Power Ratio (PAPR) of the L-LTF optimized in the broadband based on a combination of a first Radio Frequency (RF) used when the PPDU is transmitted,
the combination of the first RF is a combination of RF with 160 MHz capability or RF with 320 MHz capability, and
the first phase rotation value is [1 j −1 j j 1 −j 1 1 j −1 j −j −1 j −1].
2. The method of claim 1 , wherein the first field further includes a Legacy-Short Training Field (L-STF),
the second phase rotation value is a phase rotation value for obtaining the PAPR of the L-STF optimized in the broadband based on a combination of the first RF, and
the second phase rotation value is [1 −1 −1 −1 −j −j j −j j −j j j 1 1 1 −1].
3. The method of claim 2 , 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 or the 160+160 MHz band without preamble puncturing, and
one element of the second phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band or the 160+160 MHz band without preamble puncturing.
4. The method of claim 1 , wherein the third phase rotation value is a phase rotation value for obtaining the PAPR of the L-LTF optimized in the broadband based on a combination of a second RF used when the PPDU is transmitted,
the combination of the second RF is a combination of RF with 80 MHz capability, RF with 160 MHz capability, or RF with 320 MHz capability, and
the third phase rotation value is [1 j −1 j j 1 −j 1 1 j −1 j −j −1 j −1].
5. The method of claim 4 , wherein the first field further includes an L-STF,
the fourth phase rotation value is a phase rotation value for obtaining the PAPR of the L-STF optimized in the broadband based on a combination of the second RF, and
the fourth phase rotation value is [1 −1 −1 −1 −j −j j −j j −j j j 1 1 1 −1].
6. The method of claim 5 , wherein one element of the third phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band or the 160+160 MHz band without preamble puncturing, and
one element of the fourth phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band or the 160+160 MHz band without preamble puncturing.
7. The method of claim 5 , wherein the combination of the second RF does not include a combination in which the RF with 160 MHz capability is used in the middle 160 MHz band and the RF with 80 MHz capability is used in both of the remaining 80 MHz bands, in the 320 MHz band or 160+160 MHz band without the preamble puncturing.
8. The method of claim 2 , wherein the first field further includes control information on the L-STF sequence and the L-LTF sequence,
one of the first, second, third, or fourth phase rotation values is applied to the L-STF sequence and the L-LTF sequence, and
the second field includes a control field and a data field supporting the 802.11be wireless LAN system.
9. A receiving station (STA) in a wireless LAN system, the receiving STA comprising:
a memory;
a transceiver; and
a processor combined operatively with the memory and the transceiver, wherein the processor is configured to:
receive a Physical Protocol Data Unit (PPDU) from a transmitting STA through a broadband; and
decode the PPDU,
wherein the broadband is a 320 MHz band or a 160+160 MHz band without preamble puncturing,
the PPDU includes a first field and a second field,
the first field includes a Legacy-Long Training Field (L-LTF),
the first field is generated based on one of a first, second, third, or fourth phase rotation values,
the first phase rotation value is a phase rotation value for obtaining Peak-to-Average Power Ratio (PAPR) of the L-LTF optimized in the broadband based on a combination of a first Radio Frequency (RF) used when the PPDU is transmitted,
the combination of the first RF is a combination of RF with 160 MHz capability or RF with 320 MHz capability, and
the first phase rotation value is [1 j −1 j j 1 −j 1 1 j −1 j −j −1 j −1].
10. A method in a wireless LAN system, the method comprising:
generating a Physical Protocol Data Unit (PPDU) by a transmitting station (STA); and
transmitting the PPDU to a receiving STA through a broadband by the transmitting STA,
wherein the broadband is a 320 MHz band or a 160+160 MHz band without preamble puncturing,
the PPDU includes a first field and a second field,
the first field includes a Legacy-Long Training Field (L-LTF),
the first field is generated based on one of a first, second, third, or fourth phase rotation values,
the first phase rotation value is a phase rotation value for obtaining Peak-to-Average Power Ratio (PAPR) of the L-LTF optimized in the broadband based on a combination of a first Radio Frequency (RF) used when the PPDU is transmitted,
the combination of the first RF is a combination of RF with 160 MHz capability or RF with 320 MHz capability, and
the first phase rotation value is [1 j −1 j j 1 −j 1 1 j −1 j −j −1 j −1].
11. The method of claim 10 , wherein the first field further includes a Legacy-Short Training Field (L-STF),
the second phase rotation value is a phase rotation value for obtaining the PAPR of the L-STF optimized in the broadband based on a combination of the first RF, and
the second phase rotation value is [1 −1 −1 −1 −j −j j −j j −j j j 1 1 1 −1].
12. The method of claim 11 , 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 or the 160+160 MHz band without preamble puncturing, and
one element of the second phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band or the 160+160 MHz band without preamble puncturing.
13. The method of claim 10 , wherein the third phase rotation value is a phase rotation value for obtaining the PAPR of the L-LTF optimized in the broadband based on a combination of a second RF used when the PPDU is transmitted,
the combination of the second RF is a combination of RF with 80 MHz capability, RF with 160 MHz capability, or RF with 320 MHz capability, and
the third phase rotation value is [1 j −1 j j 1 −j 1 1 j −1 j −j −1 j −1].
14. The method of claim 13 , wherein the first field further includes an L-STF, the fourth phase rotation value is a phase rotation value for obtaining the PAPR of the L-STF optimized in the broadband based on a combination of the second RF, and
the fourth phase rotation value is [1 −1 −1 −1 −j −j j −j j −j j j 1 1 1 −1].
15. The method of claim 14 , wherein one element of the third phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band or the 160+160 MHz band without preamble puncturing, and
one element of the fourth phase rotation value is a phase rotation value applied to each 20 MHz band of the 320 MHz band or the 160+160 MHz band without preamble puncturing.
16. The method of claim 13 , wherein the combination of the second RF does not include a combination in which the RF with 160 MHz capability is used in the middle 160 MHz band and the RF with 80 MHz capability is used in both of the remaining 80 MHz bands, in the 320 MHz band or 160+160 MHz band without the preamble puncturing.
17. The method of claim 11 , wherein the first field further includes control information on the L-STF sequence and the L-LTF sequence,
one of the first, second, third, or fourth phase rotation values is applied to the L-STF sequence and the L-LTF sequence, and
the second field includes a control field and a data field supporting the 802.11be wireless LAN system.