FM Modulator Baseband (Communications Blockset)

Modulate using frequency modulation

Library

Analog Baseband Modulation, in Modulation

Description

The FM Modulator Baseband block modulates using frequency modulation. The output is a baseband representation of the modulated signal. The input signal is real, while the output signal is complex. The input must be a sample-based scalar signal. In the frequency modulation technique, the frequency of the modulated signal varies according to the amplitude of the input signal.

If the input is u(t) as a function of time t, then the output is

where is the Initial phase parameter and K_c is the Modulation constant parameter.

Dialog Box

Initial phase (rad): The initial phase of the modulated signal in radians.
Modulation constant (Hertz per volt): The modulation constant K_c.
Sample time: The sample time of the output signal. It must be a positive number.
Symbol interval (s): Inf by default. To use this block to model FSK, set this parameter to the length of time required to transmit a single information bit.

Pair Block

FM Demodulator Baseband

FM Demodulator Passband Free Space Path Loss