Communications Blockset

Baseband Modulated Signals Defined

A baseband representation of a modulated signal is often more convenient for simulation than the passband representation is, because modeling a high-frequency carrier signal is computationally intensive. Suppose the modulated signal has the waveform

where Y₁ and Y₂ are amplitude terms, f_c is the carrier frequency, and is the carrier signal's initial phase. A baseband simulation recognizes that this equals the real part of

and models only the part inside the square brackets. Here j is the square root of -1. The complex vector y is a sampling of the complex signal

Analog Modulation Features of the Blockset

Representing Signals for Analog Modulation