The field trial results for massive multi-user multiple-input multiple-output (MU-MIMO) transmission at 28 GHz with 500 MHz bandwidth are reported in this paper. In this experiment, hybrid beamforming with block diagonal precoding is employed, in which channel state information is acquired by uplink sounding assuming channel reciprocity in a time division duplex system. 8-user MU-MIMO scenarios with various user distributions are considered, and the downlink transmission performance and propagation channel characteristics are evaluated. The trial results show that digital precoding improves the system performance and that over 20 Gbps total throughput can be achieved for a variety of user distributions. The performance of the precoding is evaluated in terms of eliminating inter-user interference.

中文翻译：

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5G 中高 SHF 宽带大规模 MIMO 的 MU-MIMO 传输实验现场试验


本文报告了 28 GHz、500 MHz 带宽大规模多用户多输入多输出 (MU-MIMO) 传输的现场试验结果。在该实验中，采用了具有块对角预编码的混合波束成形，其中假设时分双工系统中的信道互易性，通过上行链路探测来获取信道状态信息。考虑各种用户分布的8用户MU-MIMO场景，评估下行传输性能和传播信道特性。试验结果表明，数字预编码提高了系统性能，各种用户分布均可实现超过20Gbps的总吞吐量。预编码的性能是根据消除用户间干扰来评估的。