Constellation_plot

Directory	DOS Name	Type
PlotFnc	cnstlplt	m-function

Purpose

A constellation plot of the data

Calling Sequence


Constellation_plot(data, Period, ...
Phase, title_str, spot)

INPUTS

Input		Description
	data	A vector or matrix of constellation points

Optional INPUTS

	Description	Default Value
Period	Period of subset of data to be plotted	1
Phase	Phase of subset of data to be plotted	0
title_str	String to display as title	[]
spot	Mark for plot	'x'

Description

The Constellation_plot() function plots a constellation specified in
the data variable.  Plotting subsets of the constellation is achieve by
specifying the period and phase which are an increment value and a
start index, respectively. Capability to specify the title of the graph
and the type of spot used are also built in.  The type of spot used
follows the convention of the plot() function.

Example


% Assign axis limits and constellation
a = [-5 5 -5 5]; c = QAM_constellation(4);
subplot(221);
% Plot all 16 constellation points
Constellation_plot(c, 1, 0, '16 QAM', 'xr');
axis(a); subplot(222);
% Plot constellation points indexed by 2, 4, 6, ...
Constellation_plot(c, 2, 0, 'Partition A', 'or');
axis(a); subplot(223);
% Plot constellation points indexed by 1, 3, 5, ...
Constellation_plot(c, 2, 1, 'Partition B', '+r');
axis(a); subplot(224);
% Plot both subset together using different spots
Constellation_plot(c, 2, 0, '', 'or'); hold on;
Constellation_plot(c, 2, 1, 'Partitions A & B', '+r');
axis(a); hold off;

DigComT Licensee: Chris Heegard 

                  Native Intelligence

Last modified: Tuesday, January 11, 2000
Date created: Tuesday, January 11, 2000

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