Method and apparatus for generating training signal using 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. The STF signal that is suggested, for example, can be used for an 80 MHz band and can be generated based on a sequence in which a predetermined M sequence is repeated. Also, the disclosed STF signal can be used for a 1×STF signal from the 1×STF signal and a 2×STF signal. 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, the method performed by a transmitting apparatus and comprising:
generating a short training field (STF) signal corresponding to an 80 MHz band; and
transmitting a physical protocol data unit (PPDU) including the generated STF signal to a receiving apparatus via the 80 MHz band,
wherein the STF signal is generated based on a predetermined M sequence defined as {M, 1, −M, 0, −M, 1, −M}*(1+j)/sqrt(2),
wherein sqrt( ) denotes a square root, and
wherein the predetermined M sequence corresponds to a sequence having a length of 15 bits that is defined as M={−1, −1, −1, 1, 1, 1, −1, 1, 1, 1, −1, 1, 1, −1, 1}.
2. The method of claim 1 , wherein the predetermined M sequence is positioned at intervals of 16 tones starting from a lowest tone having a tone index of −496 and ending at a highest tone having a tone index of +496.
3. The method of claim 2 , wherein each tone index is defined in a unit of 78.125 kHz.
4. The method of claim 1 , wherein the generated STF signal is used for automatic gain control (AGC) estimation in multiple input multiple output transmission.
5. A transmitting apparatus of a wireless local area network (LAN) system, the apparatus comprising:
a transceiver configured to transmit or receive radio signals; and
a processor coupled to the transceiver and configured to:
generate a short training field (STF) signal corresponding to an 80 MHz band; and
control the transceiver to transmit a physical protocol data unit (PPDU) including the generated STF signal to a receiving apparatus via the 80 MHz band,
wherein the STF signal is generated based on a predetermined M sequence defined as {M, 1, −M, 0, −M, 1, −M}*(1+j)/sqrt(2),
wherein sqrt( ) denotes a square root, and
wherein the predetermined M sequence corresponds to a sequence having a length of 15 bits that is defined as M={−1, −1, −1, 1, 1, 1, −1, 1, 1, 1, −1, 1, 1, −1, 1}.
6. The transmitting apparatus of claim 5 , wherein the predetermined M sequence is positioned at intervals of 16 tones starting from a lowest tone having a tone index of −496 and ending at a highest tone having a tone index of +496.
7. The transmitting apparatus of claim 6 , wherein each tone index is defined in a unit of 78.125 kHz.
8. The transmitting apparatus of claim 5 , wherein the generated STF signal is used for automatic gain control (AGC) estimation in multiple input multiple output (MIMO) transmission.
9. The method of claim 1 , wherein the generated STF signal is used for reducing Peak-to-Average Power Ratio (PAPR) of the transmitted PPDU.
10. The method of claim 1 , wherein the transmitting apparatus is an access point (AP) station or non-AP station.
11. The transmitting apparatus of claim 5 , wherein the STF signal is used for reducing Peak-to-Average Power Ratio (PAPR) of the transmitted PPDU.
12. The transmitting apparatus of claim 5 , wherein the transmitting apparatus is an access point (AP) station or non-AP station.