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COFDM constellation

Detecting signal impairments at a glance

The constellation diagram is a graphic representation of the

digital symbols received over a period of time. There are

different types of constellation diagrams for the different

modulation modes. DVB-T/T2, DVB-C/C2 and DVB-S/S2

constellations are available on the HD RANGER 2.

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Constellation diagram

16/32 APSK, 8PSK and QPSK

constellation

In the case of an ideal transmission channel, free of noise and

interferences, all symbols are recognised by the demodulator

without mistakes. In this case, they are represented in the

constellation diagram as well defined points hitting in the same

area and forming a clear dot.

16, 32, 64, 128, 256 QAM

Every modulation type is represented differently. A DVB-C

16QAM signal is represented on the screen by a total of

16 different zones, and a DVB-C 64QAM is represented on the

screen by a total of 64 different zones and so on.

CONSTELLATION DIAGRAM

is available for all DVB standards

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Promax HD Ranger + Manual do Utilizador Página 11