基于分集技术的衰落信道建模

为深入研究无线通信系统中多径衰落对信号的影响,利用MATLAB对瑞利衰落信道和莱斯衰落信道进行模拟仿真。采用选择合并、等增益合并和最大比合并3种分集接收技术来减小衰落信道对信号的影响,同时对比分析3种分集技术对信号误码率的影响。实验结果表明,莱斯衰落对信道中信号的影响比瑞利衰落小,3种抗衰落措施中最大比合并分集技术对信号的还原效果最佳。

In order to conduct an in-depth study of the influence of multipath fading on signals in wireless communication system,Rayleigh fading channel and Rice fading channel are simulated by MATLAB.Selective combining,equal gain combining and maximum ratio combining are used to reduce the influence of fading channel on the signals.At the same time,the effects of the three diversity techniques on the signal bit error rate are compared and analyzed.The experimental results show that the influence of Rice fading on the signal in the channel is smaller than that of Rayleigh fading,and the maximum ratio combining diversity technique has the best effect on signal restoration among the three anti-fading measures.