用重要性抽样方法估计数字光纤通信链路的误码率

 本文使用重要性抽样(IS)方法,对数字光纤通信链路的误码率参量进行了估计.并且,在设计IS偏置方案时采用了LDT技术,即把最优的LDT的α-扭转(指数扭转)密度选取为IS偏置密度.计算机模拟实验表明,这种基于LDT技术的IS方法具有很高的精确度和计算效率以及充分的可靠性,特别适合于极低误码率的估计.此方法为数字光纤通信链路的计算机辅助建模、分析和设计(CAMAD)提供了一种有用的研究工具.

Estimation on BERs of Digital Fiber-optic Communication Links Using Importance Sampling

In this paper,we apply Importance Sampling (IS) technique to estimate the BERs of digital fiber-optic communication links.Meanwhile,we use Large Deviations Theory (LDT) technology and select the optimized exponentially twisting (α-Tilted) density of LDT as IS biased density.Experimental results show that this kind of IS simulation method based on LDT has very high efficiency,accuracy and reliability.Especially,it is adapted to estimating very low Bit Error Rates (BERs) of communication links.This method provides an useful tool for researching into Computer-Aided Modeling,Analysis and Design (CAMAD) of digital fiber-optic communication links.