Downlink transmit beamforming in TDD-MIMO systems

XU Dao-feng 1; YANG Lv-xi1

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Downlink transmit beamforming in TDD-MIMO systems

更新时间：2024-10-14

- Downlink transmit beamforming in TDD-MIMO systems
- Vol. 30, Issue 5, Pages: 35-41(2009)
- 作者机构：
  
  1. 东南大学信息科学与工程学院
  2. 中国电子科技集团第二十八研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN919.3
- Published：2009
- 稿件说明：
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XU Dao-feng 1, YANG Lv-xi1. Downlink transmit beamforming in TDD-MIMO systems[J]. 2009, 30(5): 35-41.
DOI：

XU Dao-feng 1, YANG Lv-xi1. Downlink transmit beamforming in TDD-MIMO systems[J]. 2009, 30(5): 35-41. DOI：

摘要

针对TDD系统中移动端采用单天线发射

提出2种有效利用精确部分信道信息与统计信息的预编码方法。在无反馈信息的情况下

最大限度地利用精确的信道信息

同时在统计意义上保证其他数据流的速率;在有限反馈情况下

首先利用约束最大似然估计对移动端第2根天线对应信道矢量的方向进行估计

然后利用估计出的信道作SVD分解以确定发射预编码矩阵。仿真验证了所提方法的有效性。

Abstract

Concerning the access terminals （AT） use single antenna to transmit

two precoding methods were proposed for TDD systems that combined instantaneous CSI and statistical CSI effectively. When without feedback

instant perfect CSI was utilized to the most

while using the degrees of freedom to guarantee the average throughput of other streams; when with limited feedback

the direction of the channel vector corresponding to the second antenna at AT was firstly estimated using constrained maximum likelihood estimation

and then the optimal precoding matrix was determined through singular value decomposition of the estimated channel matrix. Simulations demonstrate the effectiveness of the proposed methods.

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