Re: about BER
Decibel is artificial (non existing in nature) parameter. It can be used to express any value: ratio between voltages, currents, volumes of sales, or water usage and so on. It is just mathematical way to represent the numbers. Nobody use decibels to express water usage or financial performance, but it is possible. Technically we may express BER in dB, it is just not used by engineers. But for some RF system calculations when sensitivity is involved it is convenient way to express processing gain in dB. This may lead to convey BER in dB because it can simplify the sensitivity equation.