湍流信道条件下大气无线光通信系统差错性能分析比较

Bite Error Rate Performance Analysis of Optical Wireless Communications Based on Turbulence Channel

摘要:

介绍了湍流信道条件下光强闪烁的对数正态分布模型和负指数分布模型,仿真分析比较了两种信道模型条件下无线光通信系统的差错性能。仿真结果表明,平均接收功率相同时,弱湍流条件下,系统的误比特率明显低于强湍流的情况；误比特率为10-5时,弱湍流信道闪烁指数为0.25情况下,系统所需的平均接收光功率为-51.5 dBm,而强湍流下,系统所需的平均接收光功率为-17.1 dBm,比弱湍流下多需34.4 dB的平均接收光功率。分析结果表明,弱湍流对数正态分布信道模型和强湍流负指数分布模型不能很好地描述中湍流信道模型,对此有待进一步研究。

Abstract:

In this paper, the bit error rate performance of optical wireless communications based on the log-normal and negative channel model of optical power was analyzed. Simulation results showed that the bit error rate performance under weak turbulence was far better than that under big turbulence. For the same bit error rate 10-5, -51.5 dbm average received optical power was required under weak turbulence (scintillation index 0.25), 34.4 dB less than that required under big turbulence (-17.1 dbm). Moreover, analysis results show that when scintillation index is 0.85 both log-normal model and negative model is not fit for, such situation needs more study.