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多输入,多输出正交频分复用(MIMO-OFDM)

于 2023-08-05 发布 文件大小:48.96 kB
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应用背景多输入,多输出正交频分复用(MIMO-OFDM) ;是4G和5G宽带无线通信的空中接口的优势。它结合了多输入,多输出(MIMO)技术,将容量的多天线传输不同的信号,和 ;正交频分复用(OFDM) ;,将无线信道到大量密集的子信道在高转速下提供更可靠的通信。研究表明,在上世纪90年代中期,MIMO可以用来与其他流行的空气接口如 ;时分多址(TDMA)和 ; ;码分多址(CDMA) ;,OFDM和MIMO技术的结合是最实用的高数据率。关键技术一个简单的MIMO-OFDM无线通信系统是基于技术分析原理构造和MIMO技术和OFDM技术的系统模型。该系统结合了MIMO系统和空时编码OFDM系统,在发送端首先完成,信号发射后的OFDM调制,接收机的过程是发射的逆过程。系统的性能是用MATLAB软件仿真,实验结果表明,MIMO-OFDM无线通信系统具有更好的性能,当天线数目非常大,其他条件相同,但系统性能会如果载波数的增加而降低。

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