In the context of cell-free massive multi-input multi-output (mMIMO), zero-forcing precoding (ZFP) requires the exchange of instantaneous channel state information and precoded data symbols via a fronthaul network. It causes considerable propagation and processing delays, which degrade performance. This letter analyzes the impact of channel aging on the performance of ZFP in cell-free mMIMO. The aging effects of not only user mobility but also phase noise are considered. Numerical results in terms of per-user spectral efficiency are illustrated.

中文翻译：

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信道老化对无小区大规模 MIMO 系统中迫零预编码的影响


在无小区大规模多输入多输出（mMIMO）的背景下，迫零预编码（ZFP）需要通过前传网络交换瞬时信道状态信息和预编码数据符号。它会导致相当大的传播和处理延迟，从而降低性能。这封信分析了信道老化对无小区 mMIMO 中 ZFP 性能的影响。不仅考虑了用户移动性的老化影响，还考虑了相位噪声的老化影响。说明了每用户频谱效率的数值结果。