Performance of communications systems receivers is generally estimated by the bit error rate (BER) which is computed using the Monte Carlo (MC) simulation (Bit Error Counting). In a previous paper, an alternative new method based on an estimation in an iterative and nonparametric way, of the probability density function (pdf) of the soft decision of the received bit, was suggested. It was shown that the hard decision is not needed to compute the BER and the total number of transmitted data needed is very small compared to the classical MC simulation. In this paper, it is proposed to study the robustness of this method. Simulation results of the suggested BER are given using a simple synchronous CDMA system.
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