Constellation of a digitally modulated signal (positions of the signal in the Fresnel plan at sampling times)

This graph shows a 128 QAM / 140 Mbit/s constellation, after adaptive equalization of a selective fading by the "Auto-adaptive equalizer" module of Radiosim. Number of symbols = 4096. Radiosim can also compute a full signature, varying the notch frequency by a "Loop" module.

constellation.gif (5215 octets)

The following figure shows parameters of the "Auto-adaptive equalizer" entered for this example :

edit-equal.gif (12383 octets)



Other examples : Fresnel plan   Eye diagram    Group delay of a feeder    Group delay of a filter
    Interferences  Bit Error Rate   Multicarrier amplification    Constellation   Differential gain