双PN码DS/MSK扩频系统的有效重要抽样仿真方法

Simulation of Dual PN Codes DS/MSK Spread Spectrum Systems through Efficient Importance Sampling

为了提高仿真速度,本文在双PN码DS/MSK扩频通信系统误码率估算中,成功地采用了有效重要抽样仿真方法,并把仿真与优化技术结合,解决了一类最佳偏置分布函数不易解析求出的重要抽样问题。仿真结果表明,有效重要抽样方法与普通Monte-Carlo方法相比,计算量可减少10~4倍左右。

This paper deals with how to simulate the BER (Bit Error Rate) of dual PN codes DS/MSK spread spectrum communication systems through the Efficient Importance Sampling (EIS) method in order to decrease the excessive run time. With the aid of combining simulation with optimization, it is possible to solve the EIS problem in which the optimum bias distribution function can not be found with ordinary mathematical methods. The simulation results show that the computation capacity of the EIS method is reduced to about one tenthousandth of that required by the common Monte-Carlo method.