研究目的
To develop a robust, easy-to-align and low-cost optical wireless link capable to address the needs of outdoor deployment of modern small-cell mobile radio technologies, like IEEE 802.11 (WiFi) and LTE, and to realize both, high data rate (200 Mb/s over around 200 m) and low latency (few ms).
研究成果
The study demonstrated that optical wireless communication can be used as a low-cost solution for the wireless backhaul of small mobile radio cells, achieving high data rates and low latency. The use of rate-adaptive transmission improved the system's availability in variable weather conditions. Further development is needed for application in future 5G mobile networks, including higher data rates and reduced latency.
研究不足
The study is limited to short-range optical wireless transmission distances of around 100 m. The impact of scattered sunlight on the link performance was observed, suggesting the need for further optimization to mitigate this effect.
1：Experimental Design and Method Selection:
The methodology includes the use of optical wireless links with rate-adaptive transmission to improve availability in variable weather conditions. A mathematical model of the backhaul link including impairments like fog and sunlight was developed and used to optimize the link design.
2：Sample Selection and Data Sources:
A 5-month outdoor field trial in Berlin, Germany, was conducted to gather data on visibility range and data rate under various weather conditions.
3：List of Experimental Equipment and Materials:
The prototype used low-cost optoelectronic components, including a high-power infrared LED and a large-area photodiode, and a 1 Gb/s baseband chipset.
4：Experimental Procedures and Operational Workflow:
The link was tested over distances of 20, 100, and 215 m, measuring gross data rates and latency. The system's performance was evaluated under different weather conditions, including fog and sunlight.
5：Data Analysis Methods:
The data rate and latency were measured and analyzed to evaluate the system's performance. The mathematical model was validated against the experimental data.
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