Method and device for transmitting training field in wireless LAN

• US 10,567,046 B2
• Filed: 08/06/2015
• Issued: 02/18/2020
• Est. Priority Date: 09/03/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, Jinsoo, Lee, Kilbom, Lee, Wookbong, Cho, Hangyu, Kang, Jiwon
• Primary Examiner(s): Moore, Ian N
• Assistant Examiner(s): Sampat, Rushil Parimal
• Application Number:
  US15/508,344
• Publication Number:
  US 20170302343A1
• Time in Patent Office: 1,657 Days
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2628 Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators H04L27/2634 takes precedence
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT

Abstract

A method and device for transmitting a training field in a wireless LAN are disclosed. The method for transmitting a training field in a wireless LAN may include the steps of generating PPDUs to be respectively transmitted to a plurality of STAs by an AP, and respectively transmitting the PPDUs by the AP to the plurality of STAS respectively through a plurality of sub bands on an OFDMA-based overlapped time resource, wherein the PPDU may include the training field, the training field may be generated based on a training sequence, and the training sequence may be designed so that a non-null tone for AGC is included in a plurality of tone that corresponds to the plurality of sub bands, respectively.

Claims

1. A method for transmitting a signal in a wireless local area network (LAN), comprising:

generating, by a transmitting station (STA), a physical protocol data unit (PPDU) including a training field,

wherein the training field is generated based on a training sequence,

wherein the training sequence is, determined based S_{20 MHz}=[0₅,C₅₃,D₁₂,C₅₂,D₁₂,C₅₃D₁₂,C₅₂,0₇] for a 20 MHz bandwidth,

wherein a sequence subset 0₅ is determined based on five consecutive zeros and sequence subset 0₇ is determined based on seven consecutive zeros,

wherein a sequence subset C₅₂ is determined based on

2. The method of claim 1, wherein the training sequence to which phase rotation is applied is determined based on

S_{20 MHz_rotation}=[0₅,C₅₂×

γ

₁⁽²⁰⁾,D₁₂×

γ

₁⁽²⁰⁾⁾,C₅₂×

γ

₂⁽²⁰⁾,D₁₂×

γ

₂⁽²⁰⁾,C₅₂×

γ

₃⁽²⁰⁾,D₁₂×

γ

₃⁽²⁰⁾,C₅₂×

γ

₄⁽²⁰⁾,0₇], and

wherein each of Υ

₁⁽²⁰⁾, Υ

₂⁽²⁰⁾, Υ

₃⁽²⁰⁾, Υ

₄⁽²⁰⁾ for the phase rotation is defined as follows;

3. The method of claim 2, wherein the training sequence is determined based on S_{40 MHz}=[0₅,S′

_{20 MHz},D₁₂,S′

_{20 MHz},0₇] for a 40 MHz bandwidth, and S′

_{20 MHz} is determined based on S′

_{20 MHz}=[C₅₂,D₁₂,C₅₂,D₁₂,C₅₂,D₁₂,C₅₂], and

wherein the training sequence is determined based on S_{80 MHz}=[0₅,S′

_{40 MHz},D₁₂,S′

_{40 MHz},0₇] for a 80 MHz bandwidth, and S′

_{40 MHz} is determined based on S′

_{40 MHz}=[S′

_{20 MHz},D₁₂,S′

_{20 MHz}].

4. A transmitting station (STA) in a wireless local area network (LAN), the transmitting STA comprising:

a transceiver configured to transmit and/or receive radio signals; and

a processor being operatively connected to the transceiver,

wherein the processor is configured to;

generate a physical protocol data unit (PPDU) including a training field,

wherein the training field is generated based on a training sequence,

wherein the training sequence is determined based on S_{20 MHz}=[0₅,C₅₂,D₁₂,C₅₂,D₁₂,C₅₂,D₁₂,C₅₂,0₇] for a 20 MHz bandwidth,

wherein a sequence subset 0₅ is determined based on five consecutive zeros and a sequence subset 0₇ is determined based on seven consecutive zeros,

wherein a sequence subset C₅₂ is determined based on

5. The transmitting STA of claim 4, wherein the training sequence to which phase rotation is applied is determined based on

S_{20 MHz_rotation}=[0₅,C₅₂×

γ

₁⁽²⁰⁾,D₁₂×

γ

₁⁽²⁰⁾⁾,C₅₂×

γ

₂⁽²⁰⁾,D₁₂×

γ

₂⁽²⁰⁾,C₅₂×

γ

₃⁽²⁰⁾,D₁₂×

γ

₃⁽²⁰⁾,C₅₂×

γ

₄⁽²⁰⁾,0₇], and

wherein each of Υ

₁⁽²⁰⁾, Υ

₂⁽²⁰⁾, Υ

₃⁽²⁰⁾, Υ

₄⁽²⁰⁾ for the phase rotation is defined as follows;

6. The transmitting STA of claim 5, wherein the training sequence is determined based on S_{40 MHz}=[0₅,S′

_{20 MHz},D₁₂,S′

_{20 MHz},0₇] for a 40 MHz bandwidth, and S′

_{20 MHz} is determined based on S′

_{20 MHz}=[C₅₂,D₁₂,C₅₂,D₁₂,C₅₂,D₁₂,C₅₂], and

wherein the training sequence is determined based on S_{80 MHz}=[0₅,S′

_{40 MHz},D₁₂,S′

_{40 MHz},0₇] for a 80 MHz bandwidth, and S′

_{40 MHz} is determined based on S′

_{40 MHz}=[S′

_{20 MHz},D₁₂,S′

_{20 MHz}].