Patent ID: 8446812

Claim:
A transmitting apparatus, comprising: a plurality of antennas, a generation unit which, capable of generating a first packet signal having a first packet format and a second packet signal having a second packet format, selectively generates one of the first and second packet signals; and a transmitter which transmits the one of the first and second packet signals generated by said generation unit from the plurality of antennas, wherein the first packet format includes (1) a Legacy LTS (Long Training Sequence) used in a first wireless communication system and (2) a MIMO (Multiple Input Multiple Output) LTS used in a second wireless system different from the first wireless system and assigned subsequent to the Legacy LTS, the second packet format is different from the first packet format, but includes a part of the first packet format except for the Legacy LTS, and a Legacy STS (Short Training Sequence) and a MIMO STS are at the heads of the first and second packet formats, respectively, the Legacy STS and the MIMO STS being different from each other in signal patterns and providing target apparatuses with AGC estimation.