Packet mode auto-detection in multi-mode wireless communication system, signal field transmission for the packet mode auto-detection, and gain control based on the packet mode

A wireless communication method comprising:

• receiving a Legacy signal (L-SIG) field of a first frame, the L-SIG field comprising a first symbol;
• receiving a first control field of the first frame after receiving the first symbol, the first control field comprising a second symbol and a third symbol;
• and
• receiving a second control field of the first frame after receiving the second and third symbols, the second control field comprising a fourth symbol,
• wherein:
• the first symbol is modulated by Binary Phase Shift Keying (BPSK),
• the second symbol comprises control information and a pilot tone, and
• the L-SIG field immediately precedes the first control field in the first frame.