A linear-cell-based radio-over-fiber (LC-RoF) system is proposed and demonstrated for efficient mobile communication in high-speed trains without hard handover processes. The configuration of the LC-RoF network and possible router architectures are discussed for the field trial test of the proposed system and for advanced systems in the future. Via the LC-RoF network, 90-GHz, millimeter-wave radio access between the ground and a train car is operated in a centralized manner. The resulting throughput of 1.5 Gbit/s is achieved in the field trial test, which is comprised of 250-Mbaud four-subcarrier differential quadrature phase-shift keying with a forward-error correction code implemented in field-programmable gate arrays to the Shinkansen train traveling at 240 km/h without any interruptions in the connections at the change of radio access units.

中文翻译：

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使用基于线性小区的光纤无线网络的高速铁路通信系统及其在 90 GHz 频段的现场试验

提出并演示了一种基于线性小区的光纤无线电 (LC-RoF) 系统，用于在没有硬切换过程的高速列车中进行高效移动通信。讨论了 LC-RoF 网络的配置和可能的路由器架构，以用于拟议系统的现场试验测试和未来的高级系统。通过 LC-RoF 网络，90 GHz 的地面和火车车厢之间的毫米波无线电接入以集中方式运行。在现场试验测试中实现了 1.5 Gbit/s 的最终吞吐量，该测试由 250 Mbaud 四副载波差分正交相移键控和在现场可编程门阵列中实现的前向纠错码组成，用于新干线列车以 240 公里/小时的速度行驶，而在无线电接入单元改变时没有任何连接中断。