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.