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A Partial Channel Reciprocity-Based Codebook for Wideband FDD Massive MIMO
IEEE Transactions on Wireless Communications ( IF 10.4 ) Pub Date : 2022-03-25 , DOI: 10.1109/twc.2022.3160498
Haifan Yin , David Gesbert

The acquisition of channel state information (CSI) in Frequency Division Duplex (FDD) massive MIMO has been a formidable challenge. In this paper, we address this problem with a novel CSI feedback framework enabled by the partial reciprocity of uplink and downlink channels in the wideband regime. We first derive the closed-form expression of the rank of the wideband massive MIMO channel covariance matrix for a given angle-delay distribution. A low-rankness property is identified, which generalizes the well-known result of the narrow-band uniform linear array setting. Then we propose a partial channel reciprocity (PCR) codebook, inspired by the low-rankness behavior and the fact that the uplink and downlink channels have similar angle-delay distributions. Compared to the latest codebook in 5G, the proposed PCR codebook scheme achieves higher performance, lower complexity at the user side, and requires less feedback. We derive the feedback overhead necessary to achieve asymptotically error-free CSI feedback. Two low-complexity alternatives are also proposed to further reduce the complexity at the base station side. Simulations with the practical 3GPP channel model show the significant gains over the latest 5G codebook, which prove that our proposed methods are practical solutions for 5G and beyond.

中文翻译:

用于宽带 FDD 大规模 MIMO 的基于部分信道互易性的码本

在频分双工 (FDD) 大规模 MIMO 中获取信道状态信息 (CSI) 一直是一项艰巨的挑战。在本文中,我们使用一种新颖的 CSI 反馈框架来解决这个问题,该框架由宽带机制中上行链路和下行链路信道的部分互易性实现。我们首先推导出给定角度延迟分布的宽带大规模 MIMO 信道协方差矩阵秩的封闭式表达式。识别出低秩属性,它概括了窄带均匀线性阵列设置的众所周知的结果。然后,我们提出了一个部分信道互易 (PCR) 码本,其灵感来自低秩行为以及上行链路和下行链路信道具有相似的角度延迟分布这一事实。与5G最新的码本相比,所提出的 PCR 码本方案在用户侧实现了更高的性能、更低的复杂度和更少的反馈。我们推导出实现渐近无差错 CSI 反馈所需的反馈开销。还提出了两种低复杂度的替代方案,以进一步降低基站侧的复杂度。使用实用的 3GPP 信道模型进行的仿真显示了最新的 5G 码本的显着增益,这证明我们提出的方法是 5G 及以后的实用解决方案。
更新日期:2022-03-25
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