TAILIEUCHUNG - Modulation Schemes Overview

In electronics and telecommunications, modulation is the process of varying one or more properties of a high-frequency periodic waveform, called the carrier signal, with a modulating signal which typically contains information to be transmitted. This is done in a similar fashion to a musician modulating a tone (a periodic waveform) from a musical instrument by varying its volume, timing and pitch. The three key parameters of a periodic waveform are its amplitude ("volume"), its phase ("timing") and its frequency ("pitch"). Any of these properties can be modified in accordance with a low frequency signal to obtain the modulated signal. Typically. | Modulation Schemes . Van Duc Nguyen 1 Modulation Schemes Overview Introduction Description of bandpass signals The concept of the complex baseband The Hilbert Transformation The analytic signal The quadrature modulator The quadrature demodulator The treatment of bandpass systems in the complex baseband . Van Duc Nguyen 2 Modulation Schemes Overview Linear modulation techniques for bandpass systems The transmitted signal The symbol alphabets ASK QAM PSK The Nyquist conditions Nyquist 1 condition intersymbol interference Nyquist 2 condition eye pattern . Van Duc Nguyen

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