室内无线光局域网中漫射多径建模方案的演进

Evolution of diffuse multipath modeling scheme for indoor wireless optical local area network

针对面向传统单光源无线光接入网络的分析性建模方案无法充分地适用于正在兴起的基于阵列式发光二极管(LED)光源的无线接入网络问题,提出了两种新的演进方案。第一种演进方案全面引入对各光源漫射分量的表征;第二种演进方案在前一方案基础上更精细化地引入对各漫射相对时延的考虑。两种演进方案都克服了现有的演进方案未考虑绝大部分光源所引入的漫射多径分量而高估信道基带传输特性的缺陷。量化结果显示,由于对漫射分量的充分考虑,避免对基带传输带宽的高估最高可达近50 MHz,避免传输幅度低估最高可达近15 d B。此外,两种演进方案能够表征接收位置、反射率以及接收端视场角(FOV)各自与传输特性的高度相关性,弥补了现有演进方案无法表征上述相关性的不足。

To overcome the inadaptability of conventional single source-oriented modeling scheme in satisfying the need of Light Emitting Diode （LED） array-based wireless optical access network, two novel evolution editions of this scheme were proposed. The first one sufficiently covered the diffuse portion from all sources. Based on the first one, the second evolution edition more precisely included the relative delays of all diffuse components. The two proposed schemes were capable of avoiding the overestimation in baseband transmission characteristic by current evolution scheme. Numerical results indicate that, the overestimation in baseband transmission bandwidth and transmission gain can be up to 50 MHz and 15 dB respectively as diffuse path components of all sources are sufficiently characterized. Moreover, two novel schemes are capable of quantifying the correlation between one of receiver position, reflectance and Field Of View （FOV） of receiver and transmission characteristic which overcomes the limitation of current evolution edition in characterizing above correlation.