Subcarrier Intensity Modulated Optical Wireless Communications:A Survey from Communication Theory Perspective

作     者：Md.Zoheb Hassan Md.Jahangir Hossain Julian Cheng Victor C.M.Leung 

作者机构：Department of Electrical and Computer EngineeringUniversity of British Columbia School of EngineeringUniversity of British Columbia 

出 版 物：《ZTE Communications》 (中兴通讯技术（英文版）)

年 卷 期：2016年第14卷第2期

页      面：2-12页

学科分类：080202[工学-机械电子工程] 08[工学] 0802[工学-机械工程] 0803[工学-光学工程] 

主　　题：Atmospheric turbulence fading optical wireless communications subcarrier intensity modulation 

摘      要：Subcarrier intensity modulation with direet detection is a modulatiou/detection technique tbr optical wireless communication systems, where a pre-modulated and properly biased radio frequency signal is modulated on the intensity of the optical carrier. The most important benefits of subcarrier intensity modulation are as follows： 1） it does not provide irreducible error floor like the conventional on-off keying intensity modulation with a fixed detection threshold; 2） it provides improved spectral efficiency and supports higher order modulation schemes; and 3） it has much less implementation complexity compared to coherent optical wireless communications with heterodyne or homodyne detection. In this paper, we present an up-to-date review of subcarrier intensity modulated optical wireless communication systems. We survey the error rate and outage performance of subcarrier intensity modulations in the atmospheric turbulence channels considering different modulation and coding schemes. We also explore different contemporary atmospheric turbulence fading mitigation solutions that can be employed for subcarrier intensity modulation. These solutions include diversity combining, adaptive transmission, relay assisted transmission, multiple-subcarrier intensity modulations, and optical orthogonal frequency division multiplexing. Moreover, we review the performance of subcarrier intensity modulations due to the pointing error and synchronization error.