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Multiuser transreceiving method in wireless communication system and device for same

  • US 10,447,448 B2
  • Filed: 11/02/2015
  • Issued: 10/15/2019
  • Est. Priority Date: 10/31/2014
  • Status: Active Grant
First Claim
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1. A data transmission method of a station (STA) in a wireless LAN (WLAN) system, comprising:

  • generating a physical protocol data unit (PPDU) including a data field, and a physical preamble which includes a legacy preamble and a high efficiency-long training field (HE-LTF); and

    transmitting the PPDU,wherein the data field is transmitted in a period quadruple (4×

    ) an inverse discrete Fourier transform/discrete Fourier transform (IDFT/DFT) period of the legacy preamble,wherein the HE-LTF is a 4×

    HE-LTF transmitted in a period quadruple (4×

    ) the IDFT/DFT period of the legacy preamble or a 2×

    HE-LTF transmitted in a period double the IDFT/DFT period of the legacy preamble,wherein pilot tones of the HE-LTF are inserted into only subcarriers having even indices from among subcarriers to which the 4×

    HE-LTF is mapped,wherein values of the pilot tones are determined as a pilot sequence predetermined per stream based on a total number of streams carrying the PPDU or determined as a pilot sequence fixed for all streams irrespective of the total number of streams,wherein pilot values included in the pilot sequence satisfy a following equation 1,
    Ψ

    j

    (n-j+1), and 



    [Equation 1]wherein n is a total number of pilot tones inserted into the subcarriers, j is a natural number less than or equal to n, Ψ

    j is a pilot value at a j-th position in the pilot sequence, and Ψ

    (n-j+1) is a pilot value at an (n−

    j+1)-th position in the pilot sequence.

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