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Digital Signal Analysis
Digital signals such as QPSK & QAM use many different factors to
determine the quality and performance of the signal. The following
section will describe some of the most common factors used in
digital signal analysis.
QAM Signal to Noise Ratio vs. BER
The theoretical bit-error rate of the QAM signal as a function of the
SNR is provided for reference.
To obtain an estimated BER of the QAM signal, one can use the
following diagram to get theoretical values for BER. In the case
that the QAM 64 mode SNR is >32, it indicates 10-12 BER. It
should be noted that changing the S/N value by as little as 1 dB
alters approximately one decade. The diagram below depicts the
theoretical BER vs. SNR.