研究目的
To develop a high-speed and handover-free communication network for high-speed trains (HSTs) using an ultrafast and switchable wavelength-division multiplexing fiber-wireless backhaul system in the W band.
研究成果
The study successfully demonstrated a high-speed and handover-free communication network for HSTs using a switched WDM fiber-wireless system in the W band. Ultrafast radio-cell switching and the possibility of connecting a central station to many remote radio cells were confirmed, indicating the potential for uninterrupted communications over several tens of kilometers.
研究不足
The study is limited by the experimental setup's space constraints, which necessitated the use of small-gain antennas. Additionally, the interaction of the optical signal phase noise with fiber dispersion affects performance over long fiber transmissions.
1：Experimental Design and Method Selection:
The study employs an ultrafast and switchable WDM fiber-wireless system in the W band for high-speed and handover-free communications to HSTs. It includes the use of a wavelength-tunable laser (TLS) for signal generation and switching, and an optical IQ modulator for data modulation.
2：Sample Selection and Data Sources:
The experiment involves transmitting approximately 20-Gb/s and 10-Gb/s signals over switched fiber-wireless links in the downlink and uplink directions, respectively.
3：List of Experimental Equipment and Materials:
Equipment includes TLS, optical IQ modulator, WDM router, SMF, EDFA, RAUs, mmWave links, and high-gain antennas.
4：Experimental Procedures and Operational Workflow:
The procedure involves signal generation, modulation, transmission over fiber and wireless links, and performance evaluation.
5：Data Analysis Methods:
Performance is evaluated using the error vector magnitude (EVM) parameter and the possibility of connecting a central station to many remote radio cells is assessed.
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