# US 12,003,356 B2 · Method and apparatus for transmitting EHT PPDU in wireless LAN system

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- Number: US 12,003,356 B2
- Document ID: US12003356B2
- Status: Granted
- Kind: B2
- Application number: 17/299,668
- Filed: 2019-12-09
- Published: 2022-02-03
- Granted: 2024-06-04
- Earliest claimed: 2018-12-13
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Eunsung Park; Jinsoo Choi; Dongguk Lim; Jinmin Kim; Sunwoong Yun
- Web page: https://patentgrep.com/patent/US12003356B2

## CPC

- H04L 27/2602: {Signal structure}
- H04B 7/0413: MIMO systems
- H04J 13/00: Code division multiplex systems (for frequency hopping H04B1/713)
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 27/26132: {using repetition}
- H04L 27/2621: {Reduction thereof using phase offsets between subcarriers}
- 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)
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method and apparatus for transmitting an EHT PPDU in a wireless LAN system is proposed. Specifically, a transmitting STA generates an EHT PPDU including a STF signal. The transmitting STA transmits the EHT PPDU to a receiving STA. The STF signal is generated on the basis of an EHT STF sequence for a 320 MHz band or a 160+160 MHz band. The EHT STF sequence for the 320 MHz band is a first sequence in which a predetermined M sequence is repeated, which is defined as {M 1 M 1 M 1 −M 0 M 1 −M 1 −M 1 M 0 M 1 M 1 M 1 −M 0 −M −1 M −1 M −1 −M}*(1+j)/sqrt(2). The sqrt( ) represents the square root. The predetermined M sequence is defined as M={−1, −1, −1, 1, 1, 1, −1, 1, 1, 1, −1, 1, 1, −1, 1}.

## Claims

### Claim 1

A method of transmitting an extremely high throughput (EHT) physical protocol data unit (PPDU) in a wireless local area network (WLAN) system, the method comprising:
generating, by a transmitting station (STA), a short training field (STF) signal; and
transmitting, by the transmitting STA, the EHT PPDU including the STF signal to a receiving STA through a 320 MHz band or a 160+160 MHz band,
wherein the STF signal is generated based on an EHT STF sequence for the 320 MHz band or the 160+160 MHz band,
wherein the EHT STF sequence for the 320 MHz band is a first sequence in which a pre-set M sequence is repeated, and is defined as:
{M 1 M 1 M 1 −M 0 M 1 −M 1 −M 1 M 0 M 1 M 1 M 1 −M 0 −M −1 M −1 M −1 −M}*(1+j)/sqrt(2),
where sqrt( ) denotes a square root, and
wherein the pre-set M sequence is defined as:
M={−1, −1, −1, 1, 1, 1, −1, 1, 1, 1, −1, 1, 1, −1, 1}.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the EHT STF sequence for the 160+160 MHz band consists of a second sequence for a primary 160 MHz channel and a third sequence for a secondary 160 MHz channel,
wherein the second sequence is defined as:
{M 1 M 1 M 1 −M 0 M 1 −M 1 −M 1 M}*(1+j)/sqrt(2), and
wherein the third sequence is defined as:
{M 1 M 1 M 1 −M 0 −M −1 M −1 M −1 −M}*(1+j)/sqrt(2).

### Claim 3 (depends on 2)

The method of claim 2,
wherein the first sequence is mapped to a frequency tone with an interval of 16 tones from a lowest tone having a tone index of −2032 to a highest tone having a tone index of +2032, and
wherein the second and third sequences are mapped to the frequency tone with an interval of 16 tones from a lowest tone having a tone index of −1008 to a highest tone having a tone index of +1008.

### Claim 4 (depends on 3)

The method of claim 3,
wherein the 320 MHz band includes a lower 160 MHz channel of which the tone index is relative low and a higher 160 MHz channel of which the tone index is relatively high,
wherein the first sequence is generated in a fourth sequence in which a high efficiency (HE) STF sequence for the 160 MHz band is repeated, by applying a phase rotation in units of 80 MHz to a sequence for the higher 160 MHz channel,
wherein the fourth sequence is defined as:
{M 1 M 1 M 1 −M 0 M 1 −M 1 −M 1 M 0 M 1 M 1 M 1 −M 0 M 1 −M 1 −M 1 M}*(1+j)/sqrt(2),
wherein the phase rotation is applied to a sequence for an 80 MHz channel of which the tone index is high in the higher 160 MHz channel, and
wherein a value of the phase ration is −1.

### Claim 5 (depends on 2)

The method of claim 2,
wherein a tone plan of the 320 MHz band or the 160+160 MHz band is determined as a repetition of a tone plan for the 160 MHz band, and
wherein the tone plan for the 160 MHz band is defined in an EHT WLAN system.

### Claim 6 (depends on 5)

The method of claim 5, wherein when the tone plan for the 160 MHz band is defined as a full band, the 160 MHz band consists of 12 guard tones, a 2020-tone resource unit (RU), 5 direct conversion (DC) tones, and 11 guard tones, based on the tone plan for the 160 MHz band, and the 2020-tone RU is an RU including 2020 tones.

### Claim 7 (depends on 5)

The method of claim 5, wherein when the tone plan for the 160 MHz is defined as orthogonal frequency division multiple access (OFDMA), the 160 MHz band consists of 12 guard tones, a 996-tone RU, a 13-tone RU, 7 DC tones, a 13-tone RU, a 996-tone RU, and 11 guard tones, based on the tone plan for the 160 MHz band, the 996-tone RU is an RU including 996 tones, and the 13-tone RU is an RU including 13 tones.

### Claim 8 (depends on 7)

The method of claim 7, wherein the 996-tone RU consists of 484 tones, one null tone, a 26-tone RU, one null tone, and a 484-tone RU, the 484-tone RU is an RU including 484 tones, and the 26-tone RU is an RU including 26 tones.

### Claim 9 (depends on 5)

The method of claim 5, wherein the transmitting STA has radio frequency (RF) capability supporting the 320 MHz band or the 160+160 MHz band through one RF.

### Claim 10 (depends on 9)

The method of claim 9,
wherein the STF signal is used to improve automatic gain control (AGC) estimation in multiple input multiple output (MIMO) transmission, and
wherein the EHT STF sequence is a sequence for obtaining a minimum peak-to-average power ratio (PAPR) based on the RF capability and the tone plan of the 320 MHz band or the 160+160 MHz band.

### Claim 11

A transmitting station (STA) for transmitting an extremely high throughput (EHT) physical protocol data unit (PPDU) in a wireless local area network (WLAN) system, the transmitting STA comprising:
a memory;
a transceiver; and
a processor operatively coupled to the memory and the transceiver, wherein the processor is configured to:
generate a short training field (STF) signal; and
transmit the EHT PPDU including the STF signal to a receiving STA through a 320 MHz band or a 160+160 MHz band,
wherein the STF signal is generated based on an EHT STF sequence for the 320 MHz band or the 160+160 MHz band,
wherein the EHT STF sequence for the 320 MHz band is a first sequence in which a pre-set M sequence is repeated, and is defined as:
{M 1 M 1 M 1 −M 0 M 1 −M 1 −M 1 M 0 M 1 M 1 M 1 −M 0 −M −1 M −1 M −1 −M}*(1+j)/sqrt(2),
where sqrt( ) denotes a square root, and
wherein the pre-set M sequence is defined as:
M={−1, −1, −1, 1, 1, 1, −1, 1, 1, 1, −1, 1, 1, −1, 1}.

### Claim 12 (depends on 11)

The transmitting STA of claim 11,
wherein the EHT STF sequence for the 160+160 MHz band consists of a second sequence for a primary 160 MHz channel and a third sequence for a secondary 160 MHz channel,
wherein the second sequence is defined as:
{M 1 M 1 M 1 −M 0 M 1 −M 1 −M 1 M}*(1+j)/sqrt(2), and
wherein the third sequence is defined as:
{M 1 M 1 M 1 −M 0 −M −1 M −1 M −1 −M}*(1+j)/sqrt(2).

### Claim 13 (depends on 12)

The transmitting STA of claim 12,
wherein a tone plan of the 320 MHz band or the 160+160 MHz band is determined as a repetition of a tone plan for the 160 MHz band, and
wherein the tone plan for the 160 MHz band is defined in an EHT WLAN system.

### Claim 14 (depends on 13)

The transmitting STA of claim 13, wherein when the tone plan for the 160 MHz band is defined as a full band, the 160 MHz band consists of 12 guard tones, a 2020-tone resource unit (RU), 5 direct conversion (DC) tones, and 11 guard tones, based on the tone plan for the 160 MHz band, and the 2020-tone RU is an RU including 2020 tones.

### Claim 15 (depends on 13)

The transmitting STA of claim 13, wherein when the tone plan for the 160 MHz is defined as orthogonal frequency division multiple access (OFDMA), the 160 MHz band consists of 12 guard tones, a 996-tone RU, a 13-tone RU, 7 DC tones, a 13-tone RU, a 996-tone RU, and 11 guard tones, based on the tone plan for the 160 MHz band, the 996-tone RU is an RU including 996 tones, and the 13-tone RU is an RU including 13 tones.

### Claim 16 (depends on 15)

The transmitting STA of claim 15, wherein the 996-tone RU consists of 484 tones, one null tone, a 26-tone RU, one null tone, and a 484-tone RU, the 484-tone RU is an RU including 484 tones, and the 26-tone RU is an RU including 26 tones.

### Claim 17 (depends on 13)

The transmitting STA of claim 13, wherein the transmitting STA has radio frequency (RF) capability supporting the 320 MHz band or the 160+160 MHz band through one RF.

### Claim 18 (depends on 17)

The method of claim 17,
wherein the STF signal is used to improve automatic gain control (AGC) estimation in multiple input multiple output (MIMO) transmission, and
wherein the EHT STF sequence is a sequence for obtaining a minimum peak-to-average power ratio (PAPR) based on the RF capability and the tone plan of the 320 MHz band or the 160+160 MHz band.

### Claim 19

A method of receiving an extremely high throughput (EHT) physical protocol data unit (PPDU) in a wireless local area network (WLAN) system, the method comprising:
receiving, by a receiving station (STA), the EHT PPDU including a short training field (STF) signal from a transmitting STA through a 320 MHz band or a 160+160 MHz band, and
decoding, by the receiving STA, the EHT PPDU,
wherein the EHT PPDU including the STF signal is transmitted to the receiving STA through a 320 MHz band or a 160+160 MHz band,
wherein the STF signal is generated based on an EHT STF sequence for the 320 MHz band or the 160+160 MHz band,
wherein the EHT STF sequence for the 320 MHz band is a first sequence in which a pre-set M sequence is repeated, and is defined as:
{M 1 M 1 M 1 −M 0 M 1 −M 1 −M 1 M 0 M 1 M 1 M 1 −M 0 −M −1 M −1 M −1 −M}*(1+j)/sqrt(2),
where sqrt( ) denotes a square root, and
wherein the pre-set M sequence is defined as:
M={−1, −1, −1, 1, 1, 1, −1, 1, 1, 1, −1, 1, 1, −1, 1}.

### Claim 20 (depends on 19)

The method of claim 19, further comprising performing, by the receiving STA, automatic gain control (AGC) estimation in multiple input multiple output (MIMO) transmission based on the STF signal.