# US 10,320,598 B2 · Data block transmitting method and transmitter

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- Number: US 10,320,598 B2
- Document ID: US10320598B2
- Status: Granted
- Kind: B2
- Application number: 15/509,832
- Filed: 2015-08-20
- Published: 2017-10-26
- Granted: 2019-06-11
- Earliest claimed: 2014-09-11
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jinsoo Choi; Wookbong Lee; Hangyu Cho
- Web page: https://patentgrep.com/patent/US10320598B2

## CPC

- H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)}
- H04L 27/18: Phase-modulated carrier systems, i.e. using phase-shift keying (H04L27/32 takes precedence)
- H04L 27/2605: {Symbol extensions, e.g. Zero Tail, Unique Word [UW]}
- H04L 27/2613: {Structure of the reference signals}
- H04L 27/2636: {with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- 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

A method of transmitting a data block in a wireless WLAN and a device using the same are provided. A transmitter transmits a physical layer protocol data unit (PPDU) that includes a legacy-signal (L-SIG). A guard period (GI) of a first orthogonal frequency division multiplexing (OFDM) symbol that follows the L-SIG is shorter than the GI of a second OFDM symbol that follows the first OFDM symbol.

## Claims

### Claim 1

A method for transmitting a data block in a wireless local area network, the method comprising:
generating, by a first station (STA), a physical layer protocol data unit (PPDU) including a first field and a second field subsequent to the first field,
wherein a first Fast Fourier Transform (FFT) value applied to the first field is smaller than a second FFT value applied to the second field,
wherein the second field includes a first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol subsequent to the first OFDM symbol,
wherein a binary phase shift keying (BPSK) modulation scheme is used for the first field, the first OFDM symbol and the second OFDM symbol, and
wherein a first guard interval (GI) of the first OFDM symbol is shorter than a second GI of a second OFDM symbol; and
transmitting, by the first STA, the PPDU to a second STA.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the PPDU further comprises a high efficiency-short training field (HE-STF), and
wherein the second FFT value is applied to the HE-STF.

### Claim 3 (depends on 2)

The method of claim 2, wherein the second FFT value is K times (K>1) greater than the first FFT value.

### Claim 4 (depends on 1)

The method of claim 1, wherein the second GI of the second OFDM symbol is M times (M>1) longer than the first GI of the first OFDM symbol.

### Claim 5

A first station (STA) in a wireless local area network, the first STA comprising:
a data generator for generating a physical layer protocol data unit (PPDU) including a first field and a second field subsequent to the first field,
wherein a first Fast Fourier Transform (FFT) value applied to the first field is smaller than a second FFT value applied to the second field,
wherein the second field includes a first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol subsequent to the first OFDM symbol,
wherein a binary phase shift keying (BPSK) modulation scheme is used for the first field, the first OFDM symbol and the second OFDM symbol, and
wherein a first guard interval (GI) of the first OFDM symbol is shorter than a second GI of a second OFDM symbol; and
a data transmitter for transmitting the PPDU to a second STA.

### Claim 6 (depends on 5)

The transmitter first STA of claim 5,
wherein the PPDU further comprises a high efficiency-short training field (HE-STF), and
wherein the second FFT value is applied to the HE-STF.