Patent ID: 8774222

Claim:
A method for transmitting a frame by a transmit station (STA) in a wireless local area network system, the method comprising: transmitting a short training symbol for coarse frequency offset estimation and timing synchronization, to a receive STA; transmitting a long training symbol for fine frequency offset estimation and channel estimation, to the receive STA; transmitting a first signal symbol including control information to the receive STA; transmitting a second signal symbol including the control information to the receive STA; transmitting a first data symbol to the receive STA; and transmitting a second data symbol to the receive STA, wherein the second signal symbol is a cyclic repeat symbol including subcarriers determined based on subcarriers of the first signal symbol, a position of the subcarriers of the second signal symbol being determined by a changed position of the subcarriers of the first signal symbol based on a subcarrier index 0.