Patent ID: 7957255

Claim:
A transmitting apparatus, comprising: 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, 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 a signal patterns and providing target apparatuses with AGC (Automatic Gain Control) estimation.