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Introduction to Digital Modulation

1EE4367 Telecom. Switching & TransmissionProf. Murat TorlakIntroduction to Digital ModulationIntroduction to Digital ModulationEE4367 Telecom. Switching & TransmissionProf. Murat TorlakIntroductionIntroduction In a Digital communication system, the source to be transmitted is discrete both in time and amplitude Digital information carrying signals must be first converted to an analog waveform prior to transmission At the receiving end, analog signals are converted back to a Digital format before presentation to the end user The conversion process at the transmitting end is known as Modulation The receiving end is known as demodulation or detection2EE4367 Telecom.

Raised Cosine Filter Raised Cosine Roll-off filter: It satisfies the Nyquist criterion The spectral efficiency offered by raised cosine filter only occurs if exact pulse shape is preserved at the carrier The transfer function of raised cosine filter. 12 EE4367 Telecom.

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