On the Performance of Multigroup Multicast Cell-Free Massive MIMO
On the Performance of Multigroup Multicast Cell-Free Massive MIMO
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DOI：
10.1109/lcomm.2017.2745578
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发表时间：
2017-12-01
期刊：
影响因子：
--
通讯作者：
Tourki, Kamel
中科院分区：
文献类型：
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作者：
Doan, Toan X.;Hien Quoc Ngo;Tourki, Kamel
我们研究了多组多播无小区大规模多输入多输出系统的性能，其中许多接入点（AP）向许多用户组多播信号。建议在 AP 上使用具有短期功率约束 (STPC) 策略的分布式共轭波束成形。此外，我们提出了一种新的传输方案，其中 AP 波束形成导频，以便每个用户可以估计信号检测的有效信道增益。导出了每用户净吞吐量的解析表达式。结果表明，当组数较小时，STPC 优于文献中使用的长期功率约束。此外，在少量用户组下，下行导频传输显着提高了系统性能。
We investigate the performance of a multigroup multicast cell-free massive multiple-input multiple-output system where many access points (APs) multicast signals to many groups of users. A distributed conjugate beamforming with short-term power constraint (STPC) policy is proposed to use at the APs. In addition, we propose a new transmission scheme in which the APs beamform pilots so that each user can estimate the effective channel gains for signal detection. The analytical expressions for the per-user net throughputs are derived. The results show that when the number of groups is small, STPC outperforms longterm power constraint used in the literature. Furthermore, at a small number of user groups, the transmission with downlink pilots improves the system performance noticeably.