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首页> 外文期刊>IEEE Transactions on Signal Processing >A Scalable Framework for CSI Feedback in FDD Massive MIMO via DL Path Aligning
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A Scalable Framework for CSI Feedback in FDD Massive MIMO via DL Path Aligning

机译：通过DL路径对齐实现FDD大规模MIMO中CSI反馈的可扩展框架

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摘要

Unlike the time-division duplexing systems, the downlink (DL) and uplink (UL) channels are not reciprocal in the case of frequency-division duplexing (FDD). However, some long-term parameters, e.g., the time delays and angles of arrival of the channel paths, enjoy reciprocity. In this paper, by efficiently exploiting the aforementioned limited reciprocity, we address the DL channel state information (CSI) feedback in a practical wideband massive multiple-input multiple-output system operating in the FDD mode. With orthogonal frequency-division multiplexing waveform and assuming frequency-selective fading channels, we propose a scalable framework for the DL pilots design, DL CSI acquisition, and the corresponding CSI feedback in the UL. In particular, the base station (BS) can transmit the FFT-based pilots with carefully selected phase shifts. Then, the user can rely on the so-called time-domain aggregate channel to derive the feedback of reduced dimensionality according to either its own knowledge about the statistics of the DL channels or the instruction from the serving BS. We demonstrate that each user can just feed back one scalar number per DL channel path for the BS to recover the DL CSIs. Comprehensive numerical results further corroborate our designs.
机译：与时分双工系统不同，在频分双工（FDD）的情况下，下行链路（DL）和上行链路（UL）不会互易。但是，某些长期参数，例如时间延迟和信道路径的到达角度，是互惠的。在本文中，通过有效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多输入多输出系统中的DL信道状态信息（CSI）反馈。在正交频分复用波形和假设频率选择衰落信道的情况下，我们为DL导频设计，DL CSI捕获以及UL中相应的CSI反馈提出了可扩展的框架。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。然后，用户可以依赖于所谓的时域聚合信道来根据其自身关于DL信道的统计的知识或来自服务BS的指令来获得降维的反馈。我们证明，每个用户只需为BS的DL信道路径反馈一个标量数即可恢复DL CSI。综合数值结果进一步证实了我们的设计。

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