针对特种车内狭小空间布局受限这一问题, 提出基于功率均衡策略的光源阵列优化结构, 构建由车内壁反射导致多路径传播而引起的码间串扰的模型, 研究多径传输延迟对光通信系统信噪比的影响, 分析均方根时延扩展与最大传输速率间的相关特性, 仿真计算系统的误码率性能。仿真结果表明: 在2 m×2 m×1.5 m车内空间, 优化结构下的光功率范围为-0.73~0.56 dBm, 均匀光照率达到80.5%。考虑多径反射引起码间串扰时系统信噪比均值为 20.92 dB, 误码率的最大值为1.47×10-6, 在运用OOK调制技术下该系统最大数据传输速率的范围107.8~373.3 Mbps。可同时满足车内照度与数据通信需求。

Due to the special vehicle′s narrow space, lighting layout is limited and the difficulty is increased. An optimal scheme of lighting layout was proposed based on optical power evenly distribution principle. Inter symbol interference model caused by the multipath dispersion from the reflection of floor in vehicle was built. The influence of multipath propagation delay on optical communication system was investigated. The relevant characteristic between the root mean square delay spread and max data rate was analyzed. Meanwhile, the Bit Error Rate(BER) was calculated by the simulation software. Simulation experiments proved that the optimizing layout scheme was valid as follows: the received optical power ranged from -0.73 dBm to 0.56 dBm in 2 m×2 m×1.5 m space size, uniform illumination rate was 80.5%, the average Signal Noise Ratio(SNR) was 20.92 dB. Moreover, the max data rate can be improved from 107.8 Mbps to 373.3 Mbps OOK at a BER of up to 1.47×10-6, which meet the international illumination standards and the actual data communication in a special vehicle.