Analysis of distributed antenna system over high-speed railway communication

Provision of high data rate services on train has attracted a great attention recently. In this paper, the issues of time division duplex (TDD) DAS, including coverage of remote antenna units (RAUs), echo channel effect and system deployment cost were analyzed. The timing drift problem while solving echo channel effect with moving cell concept in DAS was also depicted in detail. Furthermore, the frequency response, propagation model, and time dispersion parameters of the RoF-DAS channel will be analyzed with simulation. This paper provided analyzed RoF-DAS channel profile over high-speed railway communication system for future researches.