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Feedback Reduction for Beyond 5G Cellular Systems

机译：超越5G蜂窝系统的反馈减少

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Cell-less system is a promising technology of the next generation wireless communications where a group of basestations intelligently recognizes user's communication environments and cooperatively serves the user. In order to maximize the gain obtained by the basestation cooperation, acquisition of accurate downlink channel state information (CSI) at the basestation is crucial. While this task is relatively easy for the time division duplexing (TDD) systems due to the channel reciprocity, it is not easy for the frequency division duplexing (FDD) systems due to the CSI feedback overhead. This issue is even more pronounced in the cell-less systems since the user needs to estimate and feed back the downlink CSIs of multiple basestations. In this paper, we propose a multi-path selection based feedback reduction technique for the FDD-based cell-less systems. Key ingredient of the proposed technique is that the spatial domain channel can be represented by a small number of multi-path components (angle of departure (AoD) and path gain). By exploiting the property that the AoDs are quite similar in the uplink and downlink channels, we only feed back the path gain information (PGI) to the basestations. Furthermore, by choosing a few paths maximizing the sum-rate and only feed back the PGI of the chosen paths, we can further reduce the feedback overhead substantially. From the simulations on realistic scenarios, we demonstrate that the proposed selective PGI feedback scheme is very effective in achieving the feedback overhead reduction compare to the conventional scheme relying on the CSI feedback.
机译：无蜂窝系统是下一代无线通信中的一项有前途的技术，其中一组基站可以智能地识别用户的通信环境并为用户提供协作服务。为了最大化通过基站协作获得的增益，至关重要的是在基站处获取准确的下行链路信道状态信息（CSI）。尽管由于信道互易性，该任务对于时分双工（TDD）系统而言相对容易，但由于CSI反馈开销，对于频分双工（FDD）系统而言却并不容易。由于用户需要估计并反馈多个基站的下行链路CSI，因此在无蜂窝系统中此问题甚至更加明显。在本文中，我们为基于FDD的无小区系统提出了一种基于多路径选择的反馈减少技术。所提出的技术的关键要素是空间域信道可以由少量的多径分量（偏离角（AoD）和路径增益）表示。通过利用AoD在上行链路和下行链路信道中非常相似的特性，我们仅将路径增益信息（PGI）反馈给基站。此外，通过选择一些使总和速率最大化的路径并仅反馈所选路径的PGI，我们可以进一步大幅减少反馈开销。通过对现实情况的仿真，我们证明了与基于CSI反馈的常规方案相比，所提出的选择性PGI反馈方案在减少反馈开销方面非常有效。

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