多径衰落信道下的通信系统建模仿真  

Modeling and Simulation of Communication System in Multi-path Fading Channel

作　　者：范波[1] 韩方景[1] 韩方剑[1] 

机构地区：[1]国防科大电子科学与工程学院,湖南长沙410073

出　　处：《计算机仿真》2009年第4期182-185,共4页Computer Simulation

摘　　要：建模仿真广泛应用于现代通信系统的设计之中,通过仿真模型的仿真结果推断原系统性能,从而为新系统的建立或原系统的改造提供可靠的参考。建立了多径衰落信道下以π/4-DQPSK为调制方式的通信系统仿真模型,完成了仿真模型的信号表征和功能校准,着重分析多径衰落信道下滤波器滚降因子、多普勒扩展和信道延时等因素对系统误比特率性能的影响,并利用蒙特卡罗仿真实验给出了相应的误比特率曲线。仿真结果验证了仿真模型的有效性,能够为实际通信系统的设计提供可靠的理论依据。Model simulation is widely used in the design of modem communication system. The performance of system is concluded through simulation results so that reliable references are provided to establish new system or improve old system. This paper established a simulation model of communication system adopting π/4 - DQPSK in multi - path fading channel, then accomplished signal representation and function calibration of simulation model. Influences of roll - off factor, Doppler spread and channel delay on system BER performance in multi - path fading channel were analyzed emphatically. Moreover, corresponding BER curves were presented by Monte -Carlo simulation experiments. Simulation results verified the efficiency of simulation model, and the model can provide reliable theoretical evidences for the design of actual communication system..

关 键 词：通信系统 建模与仿真 多径衰落信道 误比特率 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]