Patent ID: 7587002

Claim:
A wireless receiving device for communicating with a wireless transmitting device with a wireless packet, the wireless receiving device comprising: a receiver configured to receive the wireless packet, the wireless packet including a short-preamble sequence used for a first automatic gain control (AGC) at the wireless receiving device, a first long-preamble sequence for estimating a channel impulse response between the wireless transmitting device and the wireless receiving device, a signal field for conveying information regarding a length of the wireless packet, an AGC preamble sequence used for a second automatic gain control (AGC) performed after the first automatic gain control at the wireless receiving device, a second long-preamble sequence for estimating the channel impulse response between the wireless transmitting device and the wireless receiving device, and a data field conveying data; a variable gain amplifier configured to amplify a signal received by the receiver; and a gain controller configured to control a gain of the variable gain amplifier upon receiving the AGC preamble sequence, wherein the AGC preamble sequence and the data field are transmitted in parallel via a plurality of antennas, and the short-preamble sequence, the first long-preamble sequence, and the signal field are transmitted via at least one of the antennas.