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Aligning DL paths for scalable CSI feedback in FDD massive MIMO

机译:对齐DL路径以实现FDD大规模MIMO中的可扩展CSI反馈

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In frequency-division duplexing (FDD) massive multiple-input multiple-output (MIMO) systems, the downlink (DL) and uplink (UL) channels are not reciprocal anymore. However, some long-term parameters, e.g. the time delays and angles of arrival (AoAs) of the channel paths, still enjoy reciprocity. In this paper, through efficiently exploiting the aforementioned limited reciprocity, we address the DL channel state information (CSI) feedback in a practical wideband massive MIMO system operating in the FDD mode. In particular, the base station (BS) can transmit the FFT-based pilots with carefully-selected phase shifts to align the DL paths. Then the user can rely on the so-called time-domain aggregate channel (TAC) to derive the feedback of reduced dimensionality per the instructions from the serving BS. We further demonstrate that the BS can recover the DL CSIs with the scalable feedback from the users. Numerical simulation results corroborate our designs.
机译:在频分双工(FDD)的大规模多输入多输出(MIMO)系统中,下行链路(DL)和上行链路(UL)不再互惠。但是,某些长期参数,例如通道路径的时间延迟和到达角(AoA)仍然互惠。在本文中,通过有效地利用上述有限的互易性,我们解决了在FDD模式下运行的实际宽带大规模MIMO系统中的DL信道状态信息(CSI)反馈。特别地,基站(BS)可以发送具有精心选择的相移的基于FFT的导频,以对准DL路径。然后,用户可以依赖于所谓的时域聚合信道(TAC),以根据来自服务BS的指令导出降维的反馈。我们进一步证明,BS可以利用来自用户的可伸缩反馈来恢复DL CSI。数值模拟结果证实了我们的设计。

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