This paper considers crowded massive multiple input multiple output (MIMO) communications over a Rician fading channel, where the number of users is much greater than the number of available pilot sequences. A joint user identification and line-of-sight (LOS) component derivation algorithm is proposed without requiring a threshold. Based on the derived LOS component, we design a LOS-only channel estimator and an updated channel estimator.

中文翻译：

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Rician 衰落信道上的联合用户识别和信道估计

本文考虑了 Rician 衰落信道上拥挤的大规模多输入多输出 (MIMO) 通信，其中用户数量远大于可用导频序列的数量。提出了一种无需阈值的联合用户识别和视线（LOS）分量推导算法。基于导出的 LOS 组件，我们设计了一个仅 LOS 的信道估计器和一个更新的信道估计器。