标题: | 多使用者多输入多输出系统中X架构前置编码 X-structured Precoding for Multiuser MIMO Systems |
作者: | 罗婉绮 Lo, Wan-Chi 吴文榕 Wu, Wen-Rong 电信工程研究所 |
关键字: | 前置编码;precoding |
公开日期: | 2012 |
摘要: | 多使用者多输入多输出(MU-MIMO)系统近期被广泛的研究,此系统中最主要的问题为基地台传送给一个使用者的讯号,会被传送给其他使用者的讯号所干扰,因此MU-MIMO前置编码为一个解决此问题的有效方法,在这种方法中,不同使用者之间的干扰会在传送端预先消除。现有的前置编码器主要利用强制归零(ZF)或是最小均方误差(MMSE)的准则设计,然而其效能是有限的。本论文旨在研究由最大似然(ML)准则设计的MU-MIMO前置编码,我们提出使用新开发的X架构前置编码方法于MU-MIMO系统中。首先,我们利用区块对角方(BD)方法消除多使用者干扰,MU-MIMO系统会转变成多个平行的单使用者多输入多输出(SU-MIMO)系统,接着我们针对每个SU-MIMO系统做X架构前置编码,且对所有SU-MIMO系统做功率分配。由模拟数据结果显示,我们提出的方法明显地超越现有的MU-MIMO前置编码方法。 Multiuser multiple-input-multiple-output (MU-MIMO) systems have been extensively studied recently. The main problem in the system is that the transmitted signal from a basestation to one user is interfered by the signals to other users. MU-MIMO precoding has been proposed as an effective way to solve the problem. In the approach, the interference between the different users is pre-canceled at the transmitter. Existing precoders mainly designed with zero-forcing (ZF) or minimum mean-square-error (MMSE) criteria and the performance is limited. This thesis aims to investigate MU-MIMO precoding with the maximum likelihood (ML) criterion. We propose using a newly developed X-structured precoding scheme in the MU-MIMO system. First, we use block diagonal schemes to cancel the multi-user interference such that the MU-MIMO system can be transferred to a set of parallel single-user MIMO (SU-MIMO) systems. Then, we conduct the X-structured precoding for each SU-MIMO system, and power allocating for all SU-MIMO systems. Numerical results show that the proposed method significantly outperforms the existing MU-MIMO precoding methods. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT070060212 http://hdl.handle.net/11536/72422 |
显示于类别: | Thesis |