多径衰落下通信系统的分析与仿真

Analysis of Communication System Based on Multipath Fading and Simulation

通过对通信系统的学习,研究了加性高斯白噪声信道、多径瑞利衰落信道和莱斯衰落信道3种信道。对不同信道下通信系统的性能情况进行了分析和仿真。通过对各种信道下的仿真结果分析和误码率的比较,得出多径瑞利衰落信道模型下的误码率要高于加性高斯白噪声信道和莱斯衰落信道,并严重降低通信系统性能的结论。对直接序列扩频系统具有抗多径衰落的情况进行仿真,指出直接序列扩频系统可以解决多径衰落对通信系统的影响。

According to learning communication system, three kinds of channels are studied： additive white gaussian channel, multipath rayleigh fading channel and rician fading channel. The result of analyzing and simulating the bit error rate of the different communication channels shows that the bit error rate of multipath rayleigh fading channel is higher than that of additive white gaussian chan- nel and rician fading channel which reduces the performance ability of communication system. Simulating on direct sequence spread spectrum which bears the characteristic of anti- muhipath fading follows that direct sequence spread spectrum can deal with the influence of muhipath fading in communication system.