摘要
蒙特卡罗法为获取仿真精准度,通常需要很长的仿真时间。为寻求蒙特卡罗仿真的有效替代者,由四相相移键控QPSK调制技术的基本原理出发,分析得出了QPSK和DQPSK的误码率曲线。为获得误码比特率的准确性,借助Matlab中的蒙特卡罗法和常规重要性采样法分别对DQPSK通信系统的误码率进行了仿真实验,实验结果表明常规重要性采样法是一种高效的仿真方法,它能有效解决蒙特卡罗法存在的仿真精准度和仿真运行时间过长之间的矛盾。
To obtain simulation accuracy,Monte Carlo(MC) simulation usually takes a long time.In order to find a new method to solve the problem of MC,this paper starts from the basic principle of Differential Quadrature Phase Shift Keying(QPSK),and then gets bit error rate(BER) curve of QPSK and DQPSK respectively.Finally,this paper uses Matlab to simulate BER of DQPSK communication system based on two simulation methods,MC and Conventional Importance Sampling(CIS),and the result of the simulation shows that CIS is a highly efficient method for simulation.It can solve the contradiction between simulation accuracy and simulation time efficiently.
出处
《计算机仿真》
CSCD
北大核心
2010年第1期141-144,共4页
Computer Simulation
关键词
蒙特卡罗仿真
四相相移键控
误码率
重要性采样法
Monte Carlo simulation
Differential quadrature phase shift keying(DQPSK)
Bit error rate
Conventional importance sampling(CIS)