# US 12,003,359 B2 · Method and device for receiving PPDU through broadband in wireless LAN system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,003,359 B2 - Document ID: US12003359B2 - Status: Granted - Kind: B2 - Application number: 17/632,318 - Filed: 2020-08-24 - Published: 2022-11-03 - Granted: 2024-06-04 - Earliest claimed: 2019-09-03 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Eunsung Park; Jinsoo Choi; Dongguk Lim - Web page: https://patentgrep.com/patent/US12003359B2 ## CPC - H04L 27/262: {Reduction thereof by selection of pilot symbols} - H04L 27/2602: {Signal structure} - H04L 27/2613: {Structure of the reference signals} - H04L 27/2621: {Reduction thereof using phase offsets between subcarriers} - H04W 72/04: Wireless resource allocation - H04W 84/12: WLAN [Wireless Local Area Networks] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Proposed are a method and device for receiving a PPDU in a wireless LAN system. Specifically, a reception STA receives a PPDU from a transmission STA through a broadband and decodes the PPDU. The broadband is a 320 MHz band or a 160+160 MHz band. The PPDU includes a first field and a second field. The first field includes an L-LTF. The first field is generated on the basis of a first or second phase rotation value. The first phase rotation value is generated on the basis of a third phase rotation value and a fourth phase rotation value. The third phase rotation value is a phase rotation value obtained by repeating a phase rotation value for an 80 MHz band defined in an 802.11be wireless LAN system. ## Claims ### Claim 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, 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 a first phase rotation value or a second phase rotation value, the first phase rotation value is generated based on a third phase rotation value and a fourth phase rotation value, the third phase rotation value is obtained by repeating a phase rotation value for an 80 MHz band defined in the 802.11ax wireless LAN system, the fourth phase rotation value is a phase rotation value defined in units of 80 MHz bands based on optimal Peak-to-Average Power Ratio (PAPR) of the L-LTF, the optimal PAPR of the L-LTF is obtained based on a preamble puncturing pattern and a combination of Radio Frequencies (RFs) used when the PPDU are transmitted, the preamble puncturing pattern includes all patterns of a band in which a 20 MHz band is punctured in the 320 MHz band or the 160+160 MHz band, and the combination of RFs combines an RF with 160 MHz capability or an RF with 320 MHz capability. ### Claim 2 (depends on 1) The method of claim 1, wherein the first phase rotation value is [1 1−1 −1 1 1−1 −1 j j −j −j −j −j j j], 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, and the first phase rotation value is obtained based on a product of the third phase rotation value and the fourth phase rotation value. ### Claim 3 (depends on 2) The method of claim 2, wherein the 320 MHz band or the 160+160 MHz band consists of subcarriers of which the subcarrier index ranges from −512 to 511, the first element 1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −512 to −449, the second element 1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −448 to −385, the third element −1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −384 to −321, the fourth element −1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −320 to −257, the fifth element 1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −256 to −193, the sixth element 1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −192 to −129, the seventh element −1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −128 to −65, the eighth element −1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −64 to −1, the ninth element j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 0 to 63, the tenth element j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 64 to 127, the eleventh element −j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 128 to 191, the twelfth element −j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 192 to 255, the thirteenth element −j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 256 to 319, the fourteenth element −j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 320 to 383, the fifteenth element j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 384 to 447, and the sixteenth element j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 448 to 511. ### Claim 4 (depends on 3) The method of claim 3, wherein a phase rotation value for an 80 MHz band defined in the 802.11be wireless LAN system is obtained based on the preamble puncturing pattern, the third phase rotation value is [1 1 −1 −1 1 1 −1 −1 1 1 −1 −1 1 1 −1 −1], the fourth phase rotation value is [1 1 j −j], the first element 1 of the fourth phase rotation value is applied to the first 80 MHz band of the 320 MHz band or the 160+160 MHz band, the second element 1 of the fourth phase rotation value is applied to the second 80 MHz band of the 320 MHz band or the 160+160 MHz band, the third element j of the fourth phase rotation value is applied to the third 80 MHz band of the 320 MHz band or the 160+160 MHz band, and the fourth element −j of the fourth phase rotation value is applied to the fourth 80 MHz band of the 320 MHz band or the 160+160 MHz band. ### Claim 5 (depends on 4) The method of claim 4, wherein the first field further includes a Legacy-Short Training Field (L-STF), the second phase rotation value is generated based on the third phase rotation value and the fifth phase rotation value, the fifth phase rotation value is a phase rotation value defined in units of 80 MHz bands based on optimal PAPR of the L-STF, and the optimal PAPR of the L-STF is obtained based on a combination of the preamble puncturing pattern and the RF. ### Claim 6 (depends on 5) The method of claim 5, wherein the second phase rotation value is [1 1 −1 −1 j j −j −j −j −j j j −1 −1 1 1], 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, and the second phase rotation value is obtained based on a product of the third phase rotation value and the fifth phase rotation value. ### Claim 7 (depends on 6) The method of claim 6, wherein the fifth phase rotation value is [1 j −j −1], the first element 1 of the fifth phase rotation value is applied to the first 80 MHz band of the 320 MHz band or the 160+160 MHz band, the second element j of the fifth phase rotation value is applied to the second 80 MHz band of the 320 MHz band or the 160+160 MHz band, the third element −j of the fifth phase rotation value is applied to the third 80 MHz band of the 320 MHz band or the 160+160 MHz band, and the fourth element −1 of the fifth phase rotation value is applied to the fourth 80 MHz band of the 320 MHz band or the 160+160 MHz band. ### Claim 8 (depends on 5) The method of claim 5, wherein the first field further includes control information on the L-STF sequence and the L-LTF sequence, the first phase rotation value or the second phase rotation value is applied to the L-STF sequence and the L-LTF sequence, and the second field includes a data field supporting the 802.11be wireless LAN system. ### Claim 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, 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 a first phase rotation value or a second phase rotation value, the first phase rotation value is generated based on a third phase rotation value and a fourth phase rotation value, the third phase rotation value is obtained by repeating a phase rotation value for an 80 MHz band defined in the 802.11ax wireless LAN system, the fourth phase rotation value is a phase rotation value defined in units of 80 MHz bands based on optimal Peak-to-Average Power Ratio (PAPR) of the L-LTF, the optimal PAPR of the L-LTF is obtained based on a preamble puncturing pattern and a combination of Radio Frequencies (RFs) used when the PPDU are transmitted, the preamble puncturing pattern includes all patterns of a band in which a 20 MHz band is punctured in the 320 MHz band or the 160+160 MHz band, and the combination of RFs combines an RF with 160 MHz capability or an RF with 320 MHz capability. ### Claim 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 by the transmitting STA through a broadband, wherein the broadband is a 320 MHz band or a 160+160 MHz band, 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 a first phase rotation value or a second phase rotation value, the first phase rotation value is generated based on a third phase rotation value and a fourth phase rotation value, the third phase rotation value is obtained by repeating a phase rotation value for an 80 MHz band defined in the 802.11ax wireless LAN system, the fourth phase rotation value is a phase rotation value defined in units of 80 MHz bands based on optimal Peak-to-Average Power Ratio (PAPR) of the L-LTF, the optimal PAPR of the L-LTF is obtained based on a preamble puncturing pattern and a combination of Radio Frequencies (RFs) used when the PPDU are transmitted, the preamble puncturing pattern includes all patterns of a band in which a 20 MHz band is punctured in the 320 MHz band or the 160+160 MHz band, and the combination of RFs combines an RF with 160 MHz capability or an RF with 320 MHz capability. ### Claim 11 (depends on 10) The method of claim 10, wherein the first phase rotation value is [1 1 −1 −1 1 1 −1 −1 j j −j −j −j −j j j], 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, and the first phase rotation value is obtained based on a product of the third phase rotation value and the fourth phase rotation value. ### Claim 12 (depends on 11) The method of claim 11, wherein the 320 MHz band or the 160+160 MHz band consists of subcarriers of which the subcarrier index ranges from −512 to 511, the first element 1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −512 to −449, the second element 1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −448 to −385, the third element −1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −384 to −321, the fourth element −1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −320 to −257, the fifth element 1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −256 to −193, the sixth element 1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −192 to −129, the seventh element −1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −128 to −65, the eighth element −1 of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from −64 to −1, the ninth element j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 0 to 63, the tenth element j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 64 to 127, the eleventh element −j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 128 to 191, the twelfth element −j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 192 to 255, the thirteenth element −j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 256 to 319, the fourteenth element −j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 320 to 383, the fifteenth element j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 384 to 447, and the sixteenth element j of the first phase rotation value is applied to subcarriers having a subcarrier index ranging from 448 to 511. ### Claim 13 (depends on 12) The method of claim 12, wherein a phase rotation value for an 80 MHz band defined in the 802.11be wireless LAN system is obtained based on the preamble puncturing pattern, the third phase rotation value is [1 1−1 −1 1 1 −1 −1 1 1 −1 −1 1 1 −1 −1], the fourth phase rotation value is [1 1 j −j], the first element 1 of the fourth phase rotation value is applied to the first 80 MHz band of the 320 MHz band or the 160+160 MHz band, the second element 1 of the fourth phase rotation value is applied to the second 80 MHz band of the 320 MHz band or the 160+160 MHz band, the third element j of the fourth phase rotation value is applied to the third 80 MHz band of the 320 MHz band or the 160+160 MHz band, and the fourth element −j of the fourth phase rotation value is applied to the fourth 80 MHz band of the 320 MHz band or the 160+160 MHz band. ### Claim 14 (depends on 13) The method of claim 13, wherein the first field further includes a Legacy-Short Training Field (L-STF), the second phase rotation value is generated based on the third phase rotation value and the fifth phase rotation value, the fifth phase rotation value is a phase rotation value defined in units of 80 MHz bands based on optimal PAPR of the L-STF, and the optimal PAPR of the L-STF is obtained based on a combination of the preamble puncturing pattern and the RF. ### Claim 15 (depends on 14) The method of claim 14, wherein the second phase rotation value is [1 1 −1 −1 j j −j −j −j −j j j −1 −1 1 1], 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, and the second phase rotation value is obtained based on a product of the third phase rotation value and the fifth phase rotation value. ### Claim 16 (depends on 15) The method of claim 15, wherein the fifth phase rotation value is [1 j −j −1], the first element 1 of the fifth phase rotation value is applied to the first 80 MHz band of the 320 MHz band or the 160+160 MHz band, the second element j of the fifth phase rotation value is applied to the second 80 MHz band of the 320 MHz band or the 160+160 MHz band, the third element −j of the fifth phase rotation value is applied to the third 80 MHz band of the 320 MHz band or the 160+160 MHz band, and the fourth element −1 of the fifth phase rotation value is applied to the fourth 80 MHz band of the 320 MHz band or the 160+160 MHz band. ### Claim 17 (depends on 14) The method of claim 14, wherein the first field further includes control information on the L-STF sequence and the L-LTF sequence, the first phase rotation value or the second phase rotation value is applied to the L-STF sequence and the L-LTF sequence, and the second field includes a data field supporting the 802.11be wireless LAN system.