Method and apparatus for channel estimation in wireless communication system

An apparatus of a reception apparatus in a wireless communication system, the apparatus comprising:

• at least one transceiver;
• and
• at least one processor coupled to the at least one transceiver, configured to:
• receive, from a transmission apparatus, a signal comprising a first channel estimation field (CEF) using first golay sequences and a second CEF using second golay sequences, wherein the first CEF is transmitted through a first antenna of the transmission apparatus and the second CEF is transmitted through a second antenna of the transmission apparatus,
• perform first correlation of the received signal of the first antenna by using a first correlator, and
• perform second correlation of the received signal of the second by antenna using a second correlator,
• wherein the first correlator is configured based on the first golay sequences, and the second correlator is configured based on the second golay sequences, and
• wherein the first golay sequences comprises a golay sequence of length 128 and the second golay sequences comprises a golay sequence of length 128,
• wherein a common seed comprises a vector Dn=[1 8 2 4 16 32 64], and
• wherein a first seed comprises a first vector Wn=[−1, −1, −1, −1, +1, −1 −1] for the first antenna and a second seed comprises a second vector Wn=[+1, −1, −1, −1, +1, −1 −1] for the second antenna.

An apparatus of a transmission apparatus in a wireless communication system, the apparatus comprising:

• at least one transceiver;
• and
• at least one processor coupled to the at least one transceiver, configured to:
• generate first golay sequences based on a first seed and a common seed,
• generate second golay sequences based on a second seed and the common seed,
• transmit a first channel estimation field (CEF) using the generated first golay sequences through a first antenna, wherein:
• the first CEF comprises —Ga128, Gu512, Gv512, and -Gb128,
• the Gu512 sequentially comprises -Gb128, -Ga128, Gb128, and —Ga128, and
• the Gv512 sequentially comprises -Gb128, Ga128, -Gb128, and —Ga128, and
• transmit a second CEF using the generated second golay sequences through a second antenna, wherein:
• the second CEF sequentially comprises —Ga(1)128, G(1)u512, G(1)v512, and -G(1)b128
• the G(1)u512 sequentially comprises -Gb(1)128, —Ga(1)128, Gb(1)128, and —Ga(1)128, and
• the G(1)v512 sequentially comprises -Gb(1)128, Ga(1)128, -Gb(1)128, and —Ga(1)128,
• wherein the first golay sequences comprises the Ga128 and the Gb128,
• wherein the second golay sequences comprises the Ga(1)128 and the Gb(1)128,
• wherein the common seed comprises a vector Dn=[1 8 2 4 16 32 64], and
• wherein the first seed comprises a first vector Wn=[−1, −1, −1, −1, +1, −1 −1] for the first antenna and the second seed comprises a second vector Wn=[+1, −1, −1, −1, +1, −1 −1] for the second antenna.