论文标题
推动FDD大规模MIMO波束形成的I型代码簿的限制：通道协方差重建方法
Pushing The Limit of Type I Codebook For FDD Massive MIMO Beamforming: A Channel Covariance Reconstruction Approach
论文作者
论文摘要
在第五代新广播（5G NR）频派频划分双工（FDD）大量多输入和多输出（MIMO）系统中，代码簿的频道表示分辨率与反馈通信的间接开销之间存在基本的权衡。特别是，引入了两种类型的代码簿（即I型和II型代码簿），并具有不同的分辨率和间接费用要求。尽管基于I型代码书的方案需要较低的反馈开销，但其频道状态信息（CSI）重建和波束形成性能不如基于II类型代码书的方案中的频道。但是，由于基于I型代码书的方案已在4G系统中广泛使用了很多年，因此通过基于II型代码书的方案代替了它，过夜太昂贵了，无法选择。因此，在本文中，使用I型代码书，我们利用切割平面方法的进步来优化基站（BS）的CSI重建，以缩小这两个基于代码书的光束成型方案之间的差距。提出了基于准确定无线电通道生成器（Quadriga）的通道样本的数值结果，以显示所提出的算法的出色性能，从波束成式的矢量采集方面。
There is a fundamental trade-off between the channel representation resolution of codebooks and the overheads of feedback communications in the fifth generation new radio (5G NR) frequency division duplex (FDD) massive multiple-input and multiple-output (MIMO) systems. In particular, two types of codebooks (namely Type I and Type II codebooks) are introduced with different resolution and overhead requirements. Although the Type I codebook based scheme requires lower feedback overhead, its channel state information (CSI) reconstruction and beamforming performance are not as good as those from the Type II codebook based scheme. However, since the Type I codebook based scheme has been widely used in 4G systems for many years, replacing it by the Type II codebook based scheme overnight is too costly to be an option. Therefore, in this paper, using Type I codebook, we leverage advances in cutting plane method to optimize the CSI reconstruction at the base station (BS), in order to close the gap between these two codebook based beamforming schemes. Numerical results based on channel samples from QUAsi Deterministic RadIo channel GenerAtor (QuaDRiGa) are presented to show the excellent performance of the proposed algorithm in terms of beamforming vector acquisition.
