The rail transportation industry has seen a growing interest in the use of radio-access technology (RAT) for critical and noncritical services to improve safety/reliability, performance, and passenger experience. There is a practical incentive to investigate how to improve wayside-onboard wireless channel throughput and transmission reliability to address the different requirements of data transmission. To this end, during the past two decades, the theory and practice of multiple-input/multiple-output (MIMO) communications has solidified to the point where MIMO is now the main infrastructure for several legacy and emerging radioaccess standards.

中文翻译：

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弯曲隧道中的无线电通信：用于轨道交通应用的 MIMO 信道容量

铁路运输行业对将无线电接入技术 (RAT) 用于关键和非关键服务以提高安全性/可靠性、性能和乘客体验越来越感兴趣。研究如何提高路边无线信道吞吐量和传输可靠性以解决数据传输的不同要求具有实际意义。为此，在过去的 20 年中，多输入/多输出 (MIMO) 通信的理论和实践已经巩固，现在 MIMO 已成为多种传统和新兴无线电接入标准的主要基础设施。