Communications Blockset

Analog Modulation

In most media for communication, only a fixed range of frequencies is available for transmission. One way to communicate a message signal whose frequency spectrum does not fall within that fixed frequency range, or one that is otherwise unsuitable for the channel, is to alter a transmittable signal according to the information in your message signal. This alteration is called modulation, and it is the modulated signal that you transmit. The receiver then recovers the original signal through a process called demodulation. This section describes how to modulate and demodulate analog signals with the Communications Blockset. After giving instructions for accessing the analog modulation blocks, it goes on to discuss these topics:

• Analog Modulation Features of the Blockset
• Baseband Modulated Signals Defined
• Representing Signals for Analog Modulation
• Timing Issues in Analog Modulation
• Filter Design Issues

Selected Bibliography for Interleaving

Accessing Analog Modulation Blocks