Data block transmitting method and transmitter

• US 10,320,598 B2
• Filed: 08/20/2015
• Issued: 06/11/2019
• Est. Priority Date: 09/11/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, Jinsoo, Lee, Wookbong, Cho, Hangyu
• Primary Examiner(s): Huq, Obaidul
• Application Number:
  US15/509,832
• Publication Number:
  US 20170310519A1
• Time in Patent Office: 1,391 Days
• Field of Search: 370310, 370328, 370338
• CPC Class Codes: H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying H04L27/32 takes precedence
• CPC Class Codes: 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
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: 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]
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

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

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.

2. 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.

3. The method of claim 2, wherein the second FFT value is K times (K>

1) greater than the first FFT value.

4. 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.

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.

6. 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.