ASER Analysis of General Order Rectangular QAM for Dual-Hop NLOS UV Communication System

Ultraviolet (UV) communication is capable of providing non-line-of-sight (NLOS) wireless connectivity due to strong molecular and aerosol scattering experienced at UV wavelength. The effect of atmospheric turbulence in NLOS UV channel is usually ignored under the assumption of short distance communication. However, for long distance, relay assisted communication is commonly used. In this work, we consider a dual-hop amplify-and-forward (AF) relayed outdoor NLOS UV communication system experiencing atmospheric turbulence, and derive closed-form expression of the average symbol error rate (ASER) for general order rectangular quadrature amplitude modulation (RQAM) scheme. The numerical values of ASER expression are compared with computer simulations to validate the accuracy of the theoretical analysis.