Multiuser transreceiving method in wireless communication system and device for same
First Claim
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=Ψ
(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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Accused Products
Abstract
A method for transmitting data from a station (STA) device in a wireless LAN (WLAN) system, according to one embodiment of the present invention, comprises the steps of: generating a physical protocol data unit (PPDU) including a physical preamble, which includes a legacy preamble and a high efficiency-long training field (HE-LTF), and a data field; and transmitting the PPDU, wherein the data field is transmitted at four times (4×) the inverse discrete Fourier transform (IDFT)/discrete Fourier transform (DFT) cycle of the legacy preamble, the HE-LTF is a 4×HE-LTF or a 2×HE-LTF which is respectively transmitted at the four times or two times (2×) the IDFT/DFT cycle of the legacy preamble, and wherein pilot tones of the HE-LTF may be inserted only into subcarriers having an even number of indexes from among subcarriers to which the 4×HE-LTF is mapped.
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Citations
16 Claims
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1. A data transmission method of a station (STA) in a wireless LAN (WLAN) system, comprising:
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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=Ψ
(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An STA in a WLAN system, comprising:
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an RF unit including a transceiver configured to transmit and receive RF signals; and a processor configured to control the RF unit, wherein the processor is further configured to generate a PPDU including a data field and a physical preamble which includes a legacy preamble and an HE-LTF, and to transmit the PPDU, wherein the data field is transmitted in a period quadruple (4×
) an 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, andwherein 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=Ψ
(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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification