MIMO-UWB预编码技术研究

发布时间：2018-01-05 06:41

本文关键词：MIMO-UWB预编码技术研究　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

更多相关文章： MIMO UWB 预编码 时间反转

【摘要】：随着移动互联网时代的到来,人们对于高速率无线传输的需求变大,超宽带技术(ultra wideband,UWB),多输入多输出(multiple input multiple output,MIMO)系统等近年来越发成为研究的热门课题。关于二者的研究已经分别有了很多的成果。但是关于MIMO-UWB预处理技术还有很多内容需要进一步的研究。为了尽可能的消除MIMO系统并行信道之间的相互干扰,需要在系统中进行预编码的处理。考虑到接收端复杂度不宜过高,比较合理的方法是在系统的发送端加入预处理器。本文提出了一种用于MIMO-UWB系统的时间反转-块对角化预编码方法,使用该技术将多用户MIMO系统中对预编码器进行优化。时间反转技术最初应用于声学和水下系统,但是最近也用于超宽带通信系统的研究。在时间反转系统中,接收信号在时域和空域实现能量聚焦,可以使用简单的能量检测器接收,更好地获取多径分量信息,改善接收端误码率。利用所设计的编码器,将信道传输矩阵变为能够进行特征分解的形式,使传输矩阵对角化,完全消除了共信道干扰。在研究的过程中,根据UWB信道的衰落模型,以及MIMO的并行信道模型,建立了UWB-MIMO信道传输模型,并将时间反转技术与块对角化-最小均方误差方法结合,对系统进行预处理。该算法的性能已经通过仿真分析得到了验证。信道模型的建立,以及最优预处理矩阵的求解是算法推导过程中的重点。超宽带和多输入多输出系统的结合,对于移动互联的发展是一个很有价值的研究。把时间反转技术的能量聚焦作用引入到这个领域,是一个非常具有挑战性的创新。相信本课题的研究对于高速的无线通信的发展是很有应用价值的。
[Abstract]:With the advent of the mobile Internet era, the demand for high-speed wireless transmission has become greater, ultra-wideband UWB technology. Multiple input multiple output. Mimo). The system has become a hot topic in recent years. There have been a lot of achievements in the research of the two systems. However, there are still a lot of contents about the MIMO-UWB pretreatment technology that need to be further studied. The interference between parallel channels in MIMO system is eliminated as much as possible. Pre-coding is needed in the system. Considering the complexity of the receiver should not be too high. A more reasonable method is to add preprocessor to the transmitter of the system. In this paper, a time reversal block diagonalization precoding method for MIMO-UWB system is proposed. This technique is used to optimize the precoder in multi-user MIMO systems. The time reversal technique was first applied to acoustic and underwater systems. But recently, it is also used in UWB communication system. In time reversal system, the received signal can be focused in time domain and space domain, and can be received with simple energy detector. The multi-path component information is obtained better and the bit error rate is improved. The channel transmission matrix is changed into the form of characteristic decomposition by using the designed encoder and the transmission matrix is diagonalized. The co-channel interference is completely eliminated. According to the fading model of UWB channel and the parallel channel model of MIMO, the transmission model of UWB-MIMO channel is established. The time reversal technique is combined with the block diagonalization-minimum mean square error method to preprocess the system. The performance of the algorithm has been verified by simulation analysis and the channel model has been established. The solution of the optimal preprocessing matrix is the key point in the derivation of the algorithm. The combination of UWB and multi-input multi-output system. It is a valuable research for the development of mobile interconnection. The energy focusing of time reversal technology is introduced into this field. It is a very challenging innovation. I believe the research of this topic is very valuable for the development of high-speed wireless communication.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN925

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