The traditional information hiding schemes embed the information into the image, audio and video etc, for the purposes of copyright protection, authentication, and authorized access control etc. In this paper, we propose to embed the data into the physical layer of the baseband Orthogonal Frequency Division Multiplexing (OFDM) wireless networks. We test the information hiding scheme in an additive white Gaussian noise (AWGN) channel. The experimental results indicate that when the number of carriers is limited and the channel SNR is high enough, the proposed information hiding scheme can work effectively, while the OFDM system can also work well as it used to be.