Philips 14AA3322/40B Guía de instalación descargar pdf (Pagina 105)

Generation of a transport stream for DVB and realisation of a HF-modulated DVB-signal

105 | P a g e

Question5

What is the Constellation Diagram? What do we see?

The constellation diagram is a representation of the received errors. It shows the way the symbols are

being received. We can see the received symbols on the I/Q plane (In phase, Quadrature). Each point is a

received symbol. The more symbols received in the same place, the redder is the graph.

Question6

Why don’t we receive all the different symbols in the center of the cells?

Because of the noisy environment.

Question7

If the EVM was 0, how would the constellation diagram look like?

It would look like there is only one red dot per cell. This is because all the symbols would reach the exact

same point, as there would be no noise at all.

Question8

What is the Eye Diagram?

The eye diagram is the representation of all the symbols that are being received overlapped.

It has 4 features: the opening, the overshoot, the width and the closure.

Question9

Is the Eye Diagram received in good condition? What problems do you see?

No, it has a lot of noise. We see distortion because of the noise, peak distortion, jitter effects and

intersymbolic interferences.

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Philips 14AA3322/40B Guía de instalación Pagina 105