Patent ID: 7099267

Claim:
A method comprising: receiving, in a wireless receiver, an orthogonal frequency division multiplexing (OFDM) frame transmitted via a wireless channel; obtaining an amplitude y 1 for a first preamble symbol in the OFDM frame; obtaining an amplitude y 2 for a second preamble symbol in the OFDM frame; obtaining an amplitude y 3 for a signal field in the OFDM frame; estimating a complex gain A for the channel according to the equation: A=[x *( y 1+ y 2)+ z*y 3]/(2| x| 2 +|z| 2 ), wherein x is a known value corresponding to a transmission amplitude for each of the first and second preamble symbols, z is an expected value corresponding to a transmission amplitude for the signal field, and * represents the complex conjugate operation; and adjusting detection of symbols in the OFDM frame based on the estimated complex gain.