Modulation types - PowerPoint PPT Presentation

What is Modulation?

What is Modulation?. In modulation, a message signal, which contains the information is used to control the parameters of a carrier signal, so as to impress the information onto the carrier. The Messages The message or modulating signal may be either: analogue – denoted by m ( t )

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Signal-Space Analysis

Signal-Space Analysis. ENSC 428 – Spring 2 008 Reference: Lecture 10 of Gallager. Digital Communication System. Representation of Bandpass Signal. Bandpass real signal x ( t ) can be written as:. Note that. In-phase. Quadrature-phase. Representation of Bandpass Signal. (1). (2).

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