Communications Blockset

PM Modulator Passband

Modulate using phase modulation

Library

Analog Passband Modulation, in Modulation

Description

The PM Modulator Passband block modulates using phase modulation. The output is a passband representation of the modulated signal. The output signal's frequency varies with the input signal's amplitude. Both the input and output signals are real sample-based scalar signals.

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

where f_c is the Carrier frequency parameter, is the Initial phase parameter, and K_c is the Modulation constant parameter.

An appropriate Carrier frequency value is generally much higher than the highest frequency of the input signal. To avoid having to use a high carrier frequency and consequently a high sampling rate, you can use baseband simulation (PM Modulator Baseband block) instead of passband simulation.

Dialog Box

Carrier frequency (Hz)

The frequency of the carrier.

Initial phase (rad)

The initial phase of the carrier in radians.

Modulation constant (Radians per volt)

The modulation constant K_c.

Symbol interval

Inf by default. To use this block to model PSK, set this parameter to the length of time required to transmit a single information bit.

Pair Block

PM Demodulator Passband

See Also

PM Modulator Baseband

PM Modulator Baseband

PN Sequence Generator