This paper proposes to estimate very low PAM system BER using the Improved Importance Sampling (IIs) method The results from both theoretical analysis and simulation show that the IIS estimation is unbiased. Based on calculation of the simulation variance and improvement ratio for IIS estimation, the IIS method is very effective for estimation of very low BER for PAM systems with intersymbol interference (ISI), jitter, crosstalk and additive noise.

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