Method and apparatus for generating training signal using predetermined binary sequence in wireless LAN system
AssigneeLG Electronics Inc.
InventorsEunsung Park, Jinsoo Choi, Hangyu Cho
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Abstract
Disclosed are a method and an apparatus for generating an STF signal usable in a wireless LAN system. The STF signal is included in a field used to improve AGC estimation of a MIMO transmission. A portion of the STF signal is used to transmit an uplink, and can be used for uplink MU PPDUs transmitted from a plurality of STAs. The STF signal that is disclosed, for example, is used for a 40 MHz band or an 80 MHz band, is desirably usable for the 40 MHz band, and can be generated based on a sequence in which a predetermined M sequence is repeated. The predetermined M sequence can be a binary sequence of which the length is 15 bits.
Claims14
A method of transmitting a packet in a wireless local area network (LAN) system supporting a first frequency band and a second frequency band, the method performed by a transmitting apparatus and comprising:
- selecting a short training field (STF) sequence in which a predetermined M sequence is repeated from a plurality of predetermined sequences;
- generating an STF signal corresponding to the first frequency band based on the selected STF sequence;
- and
- transmitting a physical protocol data unit (PPDU) including the generated STF signal to a receiving apparatus,
- wherein the selected STF sequence is defined as {M, −1, −M, 0, M, −1, M}*(1+j)/sqrt(2),
- wherein sqrt( ) denotes a square root,
- wherein the predetermined M sequence corresponds to a binary sequence having a length of 15 bits and is defined as M={−1, −1, −1, 1, 1, 1, −1, 1, 1, 1, −1, 1, 1, −1, 1},
- wherein the first frequency band is a 40 MHz band, and
- wherein the second frequency band is an 80 MHz band.
A transmitting apparatus of a wireless local area network (LAN) system supporting multiple frequency bands including a first frequency band and a second frequency band, the apparatus comprising:
- a radio frequency (RF) unit configured to transmit and receive radio signals;
- and
- a processor configured to:
- select a short training field (STF) sequence in which a predetermined M sequence is repeated from a plurality of predetermined sequences;
- generate an STF signal corresponding to the first frequency band based on the selected STF sequence;
- and
- control the RF unit to transmit a physical protocol data unit (PPDU) including the generated STF signal to a receiving apparatus,
- wherein the selected STF sequence is defined as {M, −1, −M, 0, M, −1, M}*(1+j)/sqrt(2),
- wherein sqrt( ) denotes a square root,
- wherein the predetermined M sequence corresponds to a binary sequence having a length of 15 bits and is defined as M={−1, −1, −1, 1, 1, 1, −1, 1, 1, 1, −1, 1, 1, −1, 1},
- wherein the first frequency band is a 40 MHz band, and
- wherein the second frequency band is an 80 MHz band.
Dependencies are inferred from the claim text.