A Search-Free Algorithm for Precoder Selection in FD-MIMO Systems with DFT-Based Codebooks

F. Penna, Hongbin Cheng, Jungwon Lee
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引用次数: 3

Abstract

In this paper, we propose a novel method for selecting the precoding matrix indicator (PMI) from a DFT-based codebook, such as the one specified for LTE full dimension (FD) MIMO. While conventional approaches are based on explicit codebook search, our method directly estimates the best PMI from the singular vectors of the channel matrix. The key idea is to exploit the DFT structure to formulate the PMI selection problem as the estimation of the linear phase ramping of a sequence. The main advantage of the proposed method is that its complexity does not scale with the number of PMI candidates, while achieving performance comparable or superior to that of state-of-the-art search-based approaches.
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基于dft码本的FD-MIMO系统预编码器选择的无搜索算法
在本文中,我们提出了一种从基于dft的码本中选择预编码矩阵指示器(PMI)的新方法,例如LTE全维(FD) MIMO指定的预编码矩阵指示器。传统方法基于显式码本搜索,而我们的方法直接从通道矩阵的奇异向量中估计最佳PMI。关键思想是利用DFT结构将PMI选择问题表述为序列的线性相位斜坡的估计。所提出的方法的主要优点是其复杂性不随PMI候选项的数量而增加,同时实现了与最先进的基于搜索的方法相当或更好的性能。
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