DSB AM Modulator Passband (Communications Blockset)

Modulate using double-sideband amplitude modulation

Library

Analog Passband Modulation, in Modulation

Description

The DSB AM Modulator Passband block modulates using double-sideband amplitude modulation. The output is a passband representation of the modulated signal. 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:

k is the Input signal offset parameter.
f_c is the Carrier frequency parameter.
is the Initial phase parameter.

It is common to set the value of k to the maximum absolute value of the negative part of the input signal u(t).

Typically, an appropriate Carrier frequency value is 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 instead of passband simulation.

Dialog Box

Input signal offset: The offset factor k. This value should be greater than or equal to the absolute value of the minimum of the input signal.
Carrier frequency (Hz): The frequency of the carrier.
Initial phase (rad): The initial phase of the carrier.

Pair Block

DSB AM Demodulator Passband

DSB AM Modulator Baseband DSBSC AM Demodulator Baseband