Scicos Block
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Quadrature Amplitude Modulation modulator block

\epsfig{file=MODQAM_f.eps,height=117pt}

Contents

Palette

Description

The M-QAM modulator block computes a rectangular constellation of I/Q symbol components from unsigned integer values given by the regular input and defined in the interval ]0;M-1]. M is the dialogue parameter 'Number of states'. This parameter must be an integer computed with :

\begin{eqnarray} M=2^{k} \end{eqnarray}


where M is the desired number of states of the modulation and k is an even integer number. The values produced in output are not normalized. For example, for a 16-QAM modulation, this block gives the following constellation diagram :
\begin{figure}\centering \scalebox{0.6}{% \input{constel_qam_ex.pstex_t}} \end{figure}
Figure 1: 16-QAM constellation diagram

Dialog box

\begin{figure}\begin{center} \epsfig{file=MODQAM_f_gui.eps,width=270pt} \end{center}\end{figure}

Default properties

Interfacing function

Computational function

See also

Authors

A. Layec