H-K大气湍流信道下空间调制相干检测的自由空间光通信
Free Space Optical Communication with Spatial Modulation and Coherent Detection over H-K Atmospheric Turbulence Channels
摘要：
光空间调制（OSM）是近年来兴起的一种室内无线光通信中功率和带宽高效的脉冲调制技术，它是实现相干自由空间光（FSO）通信系统空间分集的一种简单、低复杂度的方法。在此过程中，本文做出了以下几个新的贡献。它提出了一个通用的分析框架，以获得平均比特错误概率（ABEP）的未编码OSM相干检测中存在的相干衰落。虽然框架是一般的，足以容纳任何类型的模型的基础上湍流散射，本文的重点是H-K分布。虽然这种分布代表了一个非常普遍的散射模型，适用于各种大气条件，但过去没有考虑与FSO系统一起使用，可能是因为其数学复杂性。建议的分析框架产生精确的性能评估结果MIMO系统与两个发射和任意数量的接收孔径。此外，紧上界推导出的OSM系统的错误概率与任意数量的发射孔径，以及卷积编码信号。OSM的性能进行比较，以及建立的相干FSO计划，采用空间分集的发射机或接收机只。具体而言，它表明，OSM可以提供与传统的相干FSO计划相当的性能，同时优于后者的频谱效率和硬件复杂度。各种数值性能评估的结果也被提出，并与通过蒙特卡罗模拟得到的等效结果进行了比较，从而验证了推导出的解析表达式的准确性。
英文摘要：
The use of optical spatial modulation (OSM), which has been recently emerged as a power and bandwidth efficient pulsed modulation technique for indoor optical wireless communication, is proposed as a simple, low-complexity means of achieving spatial diversity in coherent free space optical (FSO) communication systems. In doing so, this paper makes several novel contributions as follows. It presents a generic analytical framework for obtaining the Average Bit Error Probability (ABEP) of uncoded OSM with coherent detection in the presence of turbulence-induced fading. Although the framework is general enough to accommodate any type of models based on turbulence scattering, the focus in this paper is the H-K distribution. Although this distribution represents a very general scattering model valid over a wide range of atmospheric conditions, it is has not been considered in the past in conjunction with FSO systems possibly because of its mathematical complexity. The proposed analytical framework yields exact performance evaluation results for MIMO systems with two transmit- and an arbitrary number of receive apertures. In addition, tight upper bounds are derived for the error probability for OSM systems with an arbitrary number of transmit apertures as well as for convolutionally encoded signals. The performance of OSM is compared to that of well established coherent FSO schemes, employing spatial diversity at the transmitter or the receiver only. Specifically, it is shown that OSM can offer comparable performance with conventional coherent FSO schemes while outperforming the latter in terms of spectral efficiency and hardware complexity. Various numerical performance evaluation results are also presented and compared with equivalent results obtained by Monte Carlo simulations which verify the accuracy of the derived analytical expressions.
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