基于外信息转移图的光交织多址系统性能分析

Capability analysis of OIDMA FSO communication system based on EXIT chart

光交织多址(OIDMA)技术是自由空间光(FSO)通信中的一种简单且有效的解决方案,具有较高的频谱效率和较低的多用户检测(MUD)复杂度等优点。外信息转移(EXIT)曲线图是分析迭代结构的有效工具。本文利用EXIT曲线图对OIDMA FSO系统在深空和深Gamma-Gamma大气湍流衰弱信道中的性能进行预测和分析。结果表明,OIDMA FSO系统在不同环境中都具有稳定的快速收敛性和良好的系统性能,且EXIT曲线图能够准确、高效地分析OIDMA FSO系统性能,具有重要的指导意义。

Optical Interleaver Division Multiple Access（OIDMA） system is a conceptually simple, yet still efficient solution for Free Space Optical（FSO） communications, due to its high bandwidth efficiency and low complexity of Multi User Detection（MUD）. The Extrinsic Information Transfer（EXIT） chart is an efficient tool for analyzing iterative structures. By using EXIT charts, the OIDMA FSO system over deep-space and deep Gamma-Gamma atmospheric turbulence fading channels is analyzed. Experimental results show that the OIDMA FSO system exhibits a rapid convergence, as well as excellent system performance in different scenarios. At the same time, EXIT chart is proved to be able to analyze the OIDMA FSO system accurately and effectively, which has important guiding significance.