Method for transmitting data unit in wireless local area network system and apparatus for supporting same
AssigneeLG Electronics Inc.
InventorsJong Hyun Park, Hyang Sun You, Bong Hoe Kim, Yong Ho Seok
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Abstract
Provided is a method for transmitting a data unit in a wireless local area network system, according to one embodiment. The method comprises transmitting a signal field, transmitting a first data symbol for a first data field, and transmitting a second data symbol for a second data field. The signal field, the first data symbol, and the second data symbol are transmitted through a 1 MHz channel bandwidth having a band of 1 GHz or less. Two pilot tones are inserted to each of the first data symbol and the second data symbol.
Claims12
A method for transmitting data in a wireless local area network, the method comprising:
- generating, by a transmitter, a physical layer protocol data unit (PPDU) including a short training field, a long training field, a signal field and a data field;
- and
- transmitting, by the transmitter, the PPDU over a 1 MHz bandwidth,
- wherein the data field is transmitted in N orthogonal frequency division multiplexing (OFDM) symbols,
- wherein pilots for the data field are mapped in the N OFDM symbols as follows:
- when k is −7, Pnk=Ψn mod 2,
- when k is 7, Pnk=Ψ(n+1)mod 2, and
- when k is neither 7 nor −7, Pnk=0,
- where Pnk denotes a value of a pilot at subcarrier k for OFDM symbol n, n=0, . . . , N−1, ‘mod’ denotes modulo operation and Ψ0=1, Ψ1=−1,
- wherein a guard interval (GI) used in the data is a short GI or a long GI, and
- wherein a GI used for an initial OFDM symbol of the N OFDM symbol in the data field is set to the long GI when the signal field indicates that the short GI is used for the data field.
A device configured for transmitting data in a wireless local area network, the method comprising:
- a transceiver configured to receive and transmit radio signals;
- and
- a processor operatively coupled with the transceiver and configured to:
- generate a physical layer protocol data unit (PPDU) including a short training field, a long training field, a signal field and a data field;
- and
- instruct the transceiver to transmit the PPDU over a 1 MHz bandwidth,
- wherein the data field is transmitted in N orthogonal frequency division multiplexing (OFDM) symbols,
- wherein pilots for the data field are mapped in the N OFDM symbols as follows:
- when k is −7, Pnk=Ψn mod 2,
- when k is 7, Pnk=Ψ(n+1)mod 2, and
- when k is neither 7 nor −7, Pnk=0,
- where Pnk denotes a value of a pilot at subcarrier k for OFDM symbol n, n=0, . . . , N−1, ‘mod’ denotes modulo operation and Ψ0=1, Ψ1=−1,
- wherein a guard interval (GI) used in the data is a short GI or a long GI, and
- wherein a GI used for an initial OFDM symbol of the N OFDM symbol in the data field is set to the long GI when the signal field indicates that the short GI is used for the data field.
Dependencies are inferred from the claim text.