Relationship

How to explain this BER vs SNR behaviour?

How to explain this BER vs SNR behaviour?
  1. What is the relationship between SNR and BER?
  2. Which SNR is relevant for BER?

What is the relationship between SNR and BER?

SNR is logarithmic ratio of received signal and noise power, while BER is the measure of incorrect bit identification probability.

Which SNR is relevant for BER?

The use of the two equations above with SNR = 2ηNp provides the following expression for the BER: One can use the same method to calculate the BER in the case of ASK homodyne receivers. The last BER equation and the Q equation above still remain applicable. However, the SNR is improved by 3 dB in the homodyne case.

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