衰落信道下不同调制方式误码性能研究

The Performance of Different Modulation Methods in the Fading Channel is Studied

信道是一个通信系统必不可少的部分,移动信道的特性更是非常复杂,由于受自由空间损失及多径衰落的因素会严重影响信号的接收效果。而解决这些因素带来的负面影响则是移动通信系统中的关键技术。对于多径衰落信道特性的深入研究,为更好地接收信号奠定理论基础,这对于提高系统的性能也非常重要。文章应用MATLAB仿真工具对多径信道进行了模拟,且以BPSK,BFSK,4-QAM,8-QAM,16-QAM,DS-CDMA,SFH-CDMA信号以及对BPSK信号传输增加了抗衰落技术后进行建模、仿真、通过绘制出其通过不同衰落信道的信噪比和误码率关系的对应图,并对其性能做了简要的分析,对后面各种抗衰落技术及数字传输技术的选择起到了实际参考作用。

Channel is an essential part of a communication system,and the characteristics of mobile channel are very complicated,because of the factors of free space loss and multipath fading will seriously affect the reception effect of signal.Solving the problems caused by space loss and multipath fading is the key technology in mobile communication system.The deep research on the characteristics of multipath fading channel lays a theoretical foundation for better signal reception,which is also very important for improving the performance of the system.This paper uses MATLAB simulation tool to simulate multipath channel.And BPSK,BFSK,4-QAM,8-QAM,16-QAM,DS-CDMA,SFH-CDMA signals and BPSK signal transmission after the addition of anti-fading technology for modeling,simulation,by drawing the corresponding diagram of the relationship between SNR and bit error rate through different fading channels.And its performance is briefl y expounded and analyzed,which can be of guiding signifi cance to how to choose anti-fading technology and digital transmission technology.