1. The data is imposed on the waves through digital modulation . 2. All are using different digital modulation schemes from each other. 3. Modulation order can only be defined for digital modulations . 4. In digital modulation , an analog carrier signal is modulated by a discrete signal. 5. This was quickly supplanted by digital modulation methods to achieve even greater spectral efficiency. 6. Any digital modulation scheme uses a finite number of distinct signals to represent digital data. 7. The voltage fluctuations are also translated into binary data and used to control digital modulation . 8. In the case of digital modulation , the carrier f _ c \, is never transmitted. 9. When the order of a digital modulation approaches infinity its properties approach those of the respective analog modulation. 10. Furthermore, another digital modulation is line coding, which uses a baseband carrier, rather than a passband wave.
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