电子工程词典2carrier mobility carry system carrier mobility Symbol, μ. In a semiconductor material, the average drift velocity of electrons and holes per unit electrostatic field. carrier noise Modulation of a carrier when there is no input from the modulator itself; unwanted modulation. carrier noise level The noise signal amplitude that results from unintentional fluctuations of an unmodulated carrier. carrier-on-light transmission A form of transmission in which many different signals are sent simultaneously by modulating a beam of light at multiple frequencies. carrier-on-microwave transmission A form of transmission in which many different signals are sent simultaneously by modulating a microwave signal at multiple lower frequencies. carrier-on-wire transmission A form of transmission in which ma……