浅谈无线网络中的OFDM与MIMO技术的融合

Merge of OFDM and MIMO Technology in Wirless Network

OFDM技术作为无线环境的高速传输技术,实现在给定信道内使用若干正交子载波进行调制传输,频谱相互重叠,不但减小了子载波间的相互干扰,同时又提高了频谱利用率。而MIMO技术作为目前最常见的无线技术之一,同时也是802.11N产品标志性的技术之一,能在不增加带宽的情况下成倍地提高通信系统的容量和频谱利用率。从而进一步提高无线通信系统容量,提高了数据速率。OFDM与MIMO的融合,将在OFDM基础上更加合理的开发了空间资源,可以提供更高的数据速率,改善系统性能。另一方面,加入了OFDM调制技术的MIMO系统在抗多径方面表现出了很大的优势,使得MIMO系统在频率选择性衰落信道中也能取作用。因此,两者的融合必然在下一代无线网络通信系统中扮演越来越重要的角色。

As one of high speed transfer technology in wirless enviroment,OFDM takes use of orthogonal sub-carriers to modulate transmisoon with the overlap of spectrum. This can not only reduce interference between carries, but also improve the apectrum usage. On the other hand,as one of the most common wirless technologies, MIMO is one of sympolizing technologies of 802.11N products. It can improve the capacity of communication system and spectrum usage without bandwidth increase. Thus this can further improve wirless communication system capacity and data rate. The merge of OFDM and MIMO technology can develop communication space resource with more high data rate and good characteristics of system.This also can make MIMO take a role in selective fading channels. Thus ,the merge will take more and more important role in next generation wirless network communication system.