Imperfect block diagonalization for multiuser MIMO downlink
Imperfect block diagonalization for multiuser MIMO downlink
复制标题
多用户 MIMO 下行链路的不完美块对角化
DOI：
10.1109/pimrc.2008.4699771
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
T. Nishimura
中科院分区：
文献类型：
--
作者：
H. Nishimoto;Shohei Kato;Y. Ogawa;T. Ohgane;T. Nishimura
近年来，多用户MIMO系统引起了广泛的关注。在多用户MIMO系统的下行链路中，由于基站同时向终端发送信号，因此在每个终端处存在用户间干扰（IUI）。块对角化可以实现完美的IUI抑制，已被广泛研究以解决这个问题。然而，由于基站处的零操纵，使用该方案我们不能获得额外的分集增益。本文提出了基于用户最大特征向量和Gram-Schmidt正交化的不完美块对角化算法，并通过计算机仿真对其误码性能进行了评估。结果表明，尽管其复杂度低，所提出的方案提供了良好的性能，特别是在多用户环境。
Recently, a multiuser MIMO system has attracted much attention. In the downlink of the multiuser MIMO system, since the base station simultaneously transmits signals to terminals, there is inter-user interference (IUI) at each terminal. Block diagonalization, which can achieve perfect IUI suppression, has been extensively studied to solve the issue. However, with the scheme we cannot obtain extra diversity gain due to the null steering at the base station. In this paper, we propose imperfect block diagonalization based on maximum eigenvectors of users and Gram-Schmidt orthonormalization, and its error rate performance is evaluated using computer simulations. The result shows that, despite its low complexity, the proposed scheme provides excellent performance, especially in many-user environments.