Method and apparatus for generating training signal using predetermined binary sequence in wireless LAN system
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.
1. A method in a wireless local area network, LAN, system, comprising:
generating, by a transmitting apparatus, a short training field, STF, signal; and
transmitting, by the transmitting apparatus, the STF signal to a receiving apparatus via 80 MHz band,
wherein the STF signal is generated based on a STF sequence defined as shown below:
{M, 1, −M, 0, −M, 1, −M}*(1+j)/sqrt(2), wherein ‘sqrt( )’ denotes a square root, ‘j’ denotes an imaginary number, and ‘*” denotes multiplication,
wherein the M sequence is defined as shown below:
M={− 1,−1,−1,1,1,1,−1,1,1,1,−1,1,1,−1,1}.
2. The method of claim 1 , wherein the STF sequence is positioned at intervals of 16 tones starting from a lowest tone having a tone index of −496 and up to a highest tone having a tone index of +496, wherein each tone index is defined in a unit of 78.125 kHz.
3. The method of claim 1 , wherein the STF signal is used for automatic gain control, AGC, estimation in multiple input multiple output, MIMO, transmission.
4. The method of claim 1 , wherein the transmitting apparatus is an access point, AP, station or a non-AP station.
5. A transmitting apparatus of a wireless local area network, LAN, system, comprising:
a transceiver transmitting and/or receiving a wireless signal; and
a processor controlling the transceiver,
wherein the processor is configured to:
generate a short training field, STF, signal; and
transmit, via the transceiver, the STF signal to a receiving apparatus via 80 MHz band,
wherein the STF signal is generated based on a STF sequence defined as shown below:
{M, 1, −M, 0, −M, 1, −M}*(1+j)/sqrt(2), wherein ‘sqrt( )’ denotes a square root, ‘j’ denotes an imaginary number, and ‘*” denotes multiplication, and
wherein the M sequence is defined as shown below:
M={− 1,−1,−1,1,1,1,−1,1,1,1,−1,1,1,−1,1}.
6. The apparatus of claim 5 , wherein the STF sequence is positioned at intervals of 16 tones starting from a lowest tone having a tone index of −496 and up to a highest tone having a tone index of +496, wherein each tone index is defined in a unit of 78.125 kHz.
7. The apparatus of claim 5 , wherein the STF signal is used for automatic gain control, AGC, estimation in multiple input multiple output, MIMO, transmission.
8. The apparatus of claim 5 , wherein the transmitting apparatus is an access point, AP, station or a non-AP station.