自适应波束形成技术在OFDM系统中的应用与仿真  

Application and simulation of adaptive beamforming technology in OFDM systems

作　　者：王晓辉 张曙[1] 黄蕾 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2008年第11期19-22,53,共5页Applied Science and Technology

摘　　要：为了提高OFDM系统的性能,人们引进了自适应波束形成技术来进一步抑制干扰信号(signals not of interest,SNOI),其中目前可见报道的是利用LMS(least mean square)波束形成技术的OFDM系统.但是LMS-OFDM系统需要使用训练序列,即占用更多频率资源,并且该系统在强干扰环境下工作性能下降,因此有必要研究新的且更适宜在复杂环境下工作的自适应波束形成-OFDM系统.文中将基于期望信号空间信息的MCMV(multiple constrains minimum variance)波束形成技术与OFDM系统相结合,得到一种MCMV-OFDM系统.该系统与原有的LMS-OFDM系统相比,不需要训练序列并在强干扰的环境下有着较好的性能.Adaptive beamforming technologies are used in the OFDM system to suppress the SNOI （signals not of interest） in order to improve its performance. The commonly used OFDM system involves LMS beamforming technology. But the LMS-OFDM system needs training sequences, meaning that it requires more frequency resource and may work inappropriately in strong SNOI environment. So it is necessary for us to study a new adaptive beamfonning- OFDM system which is more suitable to work in complex environment. We combined MCMV beamforming technology based on SOl with OFDM system to generate an MCMV-OFDM system .The new system needs no training sequences and has better performance in strong noisy environment than previous LMS-OFDM system.

关 键 词：OFDM 自适应波束形成 LMS MCMV 

分 类 号：TN914.3[电子电信—通信与信息系统]