The invention comprises a method and apparatus for processing signals reflecting a physiological characteristic by detecting the intensity of light following tissue absorption at two wavelengths and subtracting the best estimate of the desired signal from the difference between the signals. The roughening process enhances the adhesion between the leadframe and the molten plastic during the encapsulation of the leadframe and thereby reduces the tendency of the package to separate when exposed to moisture and numerous temperature cycles. This allows the targeted station to control the sharing of the wireless hybrid resources using a centralized control method in a direct mode for the duration of the real-time service transmission, thereby optimizing network efficiency.