A dielectric oxide film is formed on the surface of a valve metal plate formed of aluminum and a conductive polymer layer is provided so as to cover the valve metal plate and the dielectric oxide film. It is firstly obtaining a ceramic material, sintering the ceramic materials under high temperature to form a fine beads or powders, adding the beads or powders into heat-resisting plastic-steel plastic materials or metal to form a mixture, and molding the mixture to be a bearing by pressing. The determination is performed by determining at least one NNXX value from the beat sequence of the patient’s heart. The systems and methods of the present invention enable data rates exceeding 5 Mbps to be delivered through frequency channels as narrow as 50 KHz under a variety of channel conditions.