MODULATION TECHNIQUES

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˙It allows bandwidth, and flexibility in accommodating different baseband signal formats.
˙In general, a sinusoidal carrier wave may be modulated by varying any of its three degrees of freedom: amplitude, frequency, or phase.
˙In contrast to analog modulation, digital modulation makes more efficient use of the radio spectrum, and usually requires less prime power. In addition, digital modulation performs better over a fading communications channel, and is more compatible with the use of error-correcting codes.