A method is provided for network identification based on high entropy data on a network which are not easily guessed or obtained outside the network, which can prevent an attacker from \u201cspoofing\u201d the network. The inside surface includes a surface profile that is uniform from the first axial end to the second axial end, or at least is uniform for a uniform section length along the axial direction. A first chamber is positioned near the control surface, with the first chamber having a gas introduction device. By generalization and extension of the phase-shift-based precoding, a transceiver is more simplified, and communication efficiency increases.