Communications Blockset

General QAM Modulator Baseband

Modulate using quadrature amplitude modulation

Library

AM, in Digital Baseband sublibrary of Modulation

Description

The General QAM Modulator Baseband block modulates using quadrature amplitude modulation. The output is a baseband representation of the modulated signal.

The Signal constellation parameter defines the constellation by listing its points in a length-M vector of complex numbers. The input signal values must be integers between 0 and M-1. The block maps an input integer m to the (m+1)st value in the Signal constellation vector.

The input can be either a scalar or a frame-based column vector.

Upsampling the Modulated Signal

This block can output an upsampled version of the modulated signal. The Samples per symbol parameter is the upsampling factor. It must be a positive integer. For more information, see Upsampled Signals and Rate Changes in Using the Communications Blockset.

Dialog Box

Signal constellation

A real or complex vector that lists the constellation points.

Samples per symbol

The number of output samples that the block produces for each input integer.

Pair Block

General QAM Demodulator Baseband

See Also

Rectangular QAM Modulator Baseband

General QAM Demodulator Passband

General QAM Modulator Passband