Patent ID: 8059726

Claim:
A wireless transmitting device for communicating with a wireless receiving device by using a first wireless packet and a second wireless packet, the wireless transmitting device comprising: a first signal generator configured to generate a signal for transmitting the first wireless packet, the first wireless packet including: a short-preamble used for a first automatic gain control (1st AGC) at the wireless receiving device, a first long-preamble used for an estimation of a first channel impulse response between the wireless transmitting device and the wireless receiving device, a signal field following the short-preamble and the first long-preamble, and used for conveying information regarding the first wireless packet, an AGC preamble following the signal field, and used for a second automatic gain control (2nd AGC) performed after the first automatic gain control at the wireless receiving device, a second long-preamble used for an estimation of a second channel impulse response between the wireless transmitting device and the wireless receiving device, and a data field conveying data, wherein the AGC preamble is to be transmitted via at least a first antenna and a second antenna, a signal of the AGC preamble to be transmitted via the first antenna is to be transmitted via first subcarriers, a signal of the AGC preamble to be transmitted via the second antenna is to be transmitted via second subcarriers, the first subcarriers and the second subcarriers are same, cyclic shifting in time domain is applied to signals of the AGC preamble, wherein the first wireless packet is to be transmitted based on a first communication scheme by using at least the first antenna and the second antenna; the first signal generator or a second signal generator configured to generate a signal for transmitting the second wireless packet based on a second communication scheme by using at least the first antenna, wherein the first antenna is shared by transmissions of the first wireless packet and the second wireless packet.