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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 d Bm,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 d B,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。
In order to solve the problem of limited space layout in special vehicles, a light source array optimization structure based on power balance strategy is proposed, and a model of cross-talk between codes caused by multi-path propagation caused by vehicle interior reflection is proposed. System signal to noise ratio, analyzes the correlation between the rms delay spread and the maximum transmission rate, and simulates the bit error rate performance of the system. The simulation results show that the optical power range of the optimized structure is -0.73 ~ 0.56 d Bm and the uniform illumination rate reaches 80.5% in the interior space of 2 m × 2 m × 1.5 m. Considering the crosstalk caused by multi-path interference, the average signal-to-noise ratio of system is 20.92 d B and the maximum bit error rate is 1.47 × 10-6. Under the condition of OOK modulation, the maximum data transmission rate of the system is 107.8 ~ 373.3 Mbps . Can meet the illumination and data communication needs of the car at the same time.