弱湍流中紫外光非直视分集接收技术的研究

根据弱湍流信道中对数正态分布模型，建立了紫外光非直视分集接收系统。采用开关键控（OOK）调制，在不同闪烁指数和接收天线数下，分别对比分析了最大比合并（MRC）、等增益合并（EGC）和选择性合并（SC）的误码性能。仿真结果表明，相比于无分集情况，采用三种合并方式的误码率性能有明显提升。在接收天线数相同的情况下，三种合并方式中，MRC的性能最优，其次是EGC，SC的性能最差。对比分析了不同接收天线数时的误码率性能，随着接收天线数的增加，三种合并方式的误码性能得到了较大改善。在弱湍流信道中，采用分集接收技术能够减轻衰落的影响，提高分集增益。

Research on ultraviolet non-line-of-sight diversity reception technology in weak turbulence

Based on the log-normal model in the turbulence channel, ultraviolet Non-Line-of-Sight (NLOS) diversity reception system was established. Using on-off keying(OOK) modulation, the bit error rate(BER) performances among three linear combining technologies as maximal ratio combining(MRC), equal gain combining(EGC) and selection combining(SC) for different scintillation indices and different receiving antennas were analyzed. The simulation results show that the BER performance of the three merge methods has been significantly improved compared with the case of no diversity. In the case of the same number of receiving antennas, the performance of the system by MRC is the best, followed by EGC, and SC is poor. The BER performance of different receiving antennas has been compared and analyzed, three linear combining technologies have strong ability to improve the performance with the increase of receiving antennas. In weak turbulence channel, the diversity reception technology can reduce the influence of fading and increase diversity gain.