研究目的
Investigating the use of optical wireless links as a robust outdoor backhaul solution for small radio cells, such as WiFi, LTE and 5G, over distances between 20 and 200 m.
研究成果
The study demonstrated that optical wireless links can serve as a robust and low-cost backhaul solution for small radio cells, achieving high data rates and low latency over short to medium distances. The use of rate-adaptive transmission significantly improved link availability in variable weather conditions. The findings suggest potential for further development towards 5G mobile networks.
研究不足
The study is limited to outdoor optical wireless links over distances between 20 and 200 m. The impact of weather conditions like fog and sunlight on link performance was a significant challenge, though rate-adaptive transmission helped mitigate these effects.
1：Experimental Design and Method Selection:
The study involved the design and implementation of an optical wireless link using low-cost optoelectronic components and a 1 Gb/s baseband chipset. Rate-adaptive transmission was used to improve availability in the presence of fog or sunlight.
2：Sample Selection and Data Sources:
A 5-month outdoor field trial in Berlin, Germany, was conducted to gather data on visibility range and link performance under various weather conditions.
3：List of Experimental Equipment and Materials:
The prototype used a low-cost infrared LED SFH 4783, a silicon photodiode S6968 from Hamamatsu, and lenses with specific focal lengths and diameters.
4：Experimental Procedures and Operational Workflow:
The link was tested over distances of 20, 100, and 215 m, with data rates and latency measured under different conditions.
5：Data Analysis Methods:
A mathematical model of the backhaul link including impairments was used to analyze the data and optimize the link design.
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