Question
Define modulation in data communication. Explain angle-based modulation techniques and discuss any two challenges associated with their use.
Answer :
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Modulation in data communication refers to the process of varying a carrier signal’s characteristics—such as its amplitude, frequency, or phase—in order to transmit data over a communication medium. This technique is essential for sending data over long distances, as it allows low-frequency information signals to be transmitted at higher frequencies, where the medium (like radio waves or optical fibers) is more effective. One of the most common modulation techniques is angle-based modulation, which specifically involves variations in the phase and frequency of the carrier signal to encode information. In angle-based modulation, two primary techniques are used: Phase Modulation
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