Bit error rate of a digitally modulated signal

Upper curve : Bit error rate versus C/N for a 128 QAM / 28 MBaud signal, in presence of non linearities and interferers. The noise power N is defined in the Nyquist bandwidth (28 MHz). C is the maximum power  within the constellation of modulation states.

Lower curve : Theoretical bit error rate, without non-linearities and interferences.

ber.gif (6929 octets)

Other examples : Fresnel plan   Eye diagram    Group delay of a feeder   Group delay of a filter
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