Wireless communication method and apparatus

A wireless communication device comprising:

• a receiver which generates a reception signal by receiving a plurality of automatic gain control (AGC) preambles to be transmitted from a plurality of antennas, a channel estimation preamble to be transmitted after transmission of the AGC preambles from the plurality of antennas, and at least one data stream to be transmitted by the plurality of antennas, as subcarriers distributed to the plurality of antennas after transmission of the channel estimation preamble;
• a variable gain amplifier which amplifies the reception signal;
• a gain control unit configured to controls a gain of the variable gain amplifier by using information of the AGC preamble contained in the reception signal;
• and
• an analog-to-digital converter which converts an output signal from the variable gain amplifier into a digital signal.

A wireless communication method comprising:

• transmitting a request signal to a second wireless communication device with a first wireless communication device;
• transmitting a wireless packet signal in response to the request signal with the second wireless communication device via a plurality of antennas, the wireless packet signal comprising an automatic gain control (AGC) preamble, a channel estimation preamble, and at least one data stream as subcarriers distributed to the plurality of antennas;
• and
• estimating a channel response by receiving the wireless packet signal with the first wireless communication device.