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在工程实践中,由于制造工艺、光源设计、封装技术等因素的影响,大部分的商用发射器光源有各自独特的辐射特性,属于非朗伯发射器的范畴。但现有无线光局域网的物理信道表征都是基于发端光源为标准的朗伯发射器。针对该问题,将两种典型的非朗伯发射器的辐射特性引入无线光局域网的物理多径信道表征,并通过与传统朗伯发射器比较,重点分析其对室内无线光覆盖表现的影响。量化结果显示,非朗伯发射器,特别是呈现碗状辐射特性的发射器可以有效提高光路径损耗的空间一致性,提升幅度可达0.5 d B。然而,在覆盖区域的时延特性上,两种非朗伯发射器都不同程度地抬升了均方根时延扩展,抬升幅度分别达到了0.27 ns和0.38 ns。
In engineering practice, due to the manufacturing process, light source design, packaging technology and other factors, most of the commercial emitter light source has its own unique radiation characteristics, are non-Lambertian emitter category. However, the physical channel characterization of the existing WLANs is based on the originating light source as a standard Lambertian transmitter. In response to this problem, the radiation characteristics of two typical non-Lambertian transmitters are introduced into the physical multipath channel characterization of wireless LAN, and compared with the traditional Lambertian transmitters, the emphasis is put on the influence of radiation characteristics on indoor wireless light coverage. Quantitative results show that non-Lambertian emitters, especially those with bowl-shaped radiation characteristics, can effectively improve the spatial consistency of optical path loss by up to 0.5 dB. However, both of the non-Lambert transmitters uplifted the rms delay spread to varying extents over the time delay of the coverage area by 0.27 ns and 0.38 ns, respectively.