论文标题
Weichselberger Rician频道上的多个Antenna用户的无细胞大型MIMO
Cell-Free Massive MIMO with Multi-Antenna Users over Weichselberger Rician Channels
论文作者
论文摘要
我们考虑使用带有随机相移的Weichselberger Rician褪色通道，使用多个Antenna访问点和用户设备（UES）的无单元大型多输入多输出（MIMO）系统。更具体地说，我们研究了两种务实处理方案的上行频谱效率（SE）：1）具有全球最小均值误差（MMSE）或最大比率（MR）组合的完全集中的处理方案； 2）具有本地MMSE或MR组合的大规模褪色解码（LSFD）方案。为了改善系统性能，我们仅基于UE侧相关矩阵的特征性矩阵提出了实用的上行链路预编码方案。此外，我们得出了新型的封闭式SE表达式，以通过MR组合来表征LSFD方案。数值结果验证了我们派生的表达式的准确性，并表明所提出的预编码方案可以显着改善与场景相比，而没有任何预编码方案。
We consider a cell-free massive multiple-input multiple-output (MIMO) system with multi-antenna access points and user equipments (UEs) over Weichselberger Rician fading channels with random phase-shifts. More specifically, we investigate the uplink spectral efficiency (SE) for two pragmatic processing schemes: 1) the fully centralized processing scheme with global minimum mean square error (MMSE) or maximum ratio (MR) combining; 2) the large-scale fading decoding (LSFD) scheme with local MMSE or MR combining. To improve the system SE performance, we propose a practical uplink precoding scheme based on only the eigenbasis of the UE-side correlation matrices. Moreover, we derive novel closed-form SE expressions for characterizing the LSFD scheme with the MR combining. Numerical results validate the accuracy of our derived expressions and show that the proposed precoding scheme can significantly improve the SE performance compared with the scenario without any precoding scheme.
