Abstract
It has been demonstrated that the amplitude probability distribution (APD) of an interfering signal provides an approximation for the bit error probability (BEP) of a radio communication system subjected to interference. The expression for BEP can be applied to the definition of emission limits for protecting a radio system. For communication systems employing multilevel modulation, the expression in some cases underestimates the maximum BEP when the interference is impulsive. In this paper, an improved BEP expression that removes the underestimation risk is derived considering the probability of multiple bit errors caused by one symbol error. On the basis of the new expression, a method of defining emission requirements is proposed by introducing a limit line that restricts the slope of the APD curve.
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