Patent ID: 7929409

Claim:
A method for wireless orthogonal frequency division multiplexing (OFDM) communications, the method comprising: receiving an electromagnetic OFDM communication signal, wherein the OFDM communication signal is an electromagnetic signal or an electronic signal including embedded digital information, wherein the digital information is encoded by performing a first code puncturing of one or more sub-carriers of the OFDM communication signal at a first forward error correction (FEC) rate and performing a second code puncturing of the one or more sub-carriers of the OFDM communication signal at a second FEC rate, wherein the second FEC rate is higher than the first FEC rate, and wherein the digital information includes watermark information that is steganographically embedded in a portion of the digital information that is discarded when performing the second code puncturing such that the digital information appears to be encoded at the first FEC rate; extracting the steganographically embedded digital information from the received electromagnetic OFDM communication signal; and comparing the digital information extracted with a stored information.