Link adaptation of FAHOR communication system

Abstract

Radio frequency (RF) spectrum is already too crowded for new broadband channels. Free space optical (FSO) communication is an emerging technology which offers enormous bandwidth, low setup cost and highly secure link. However, FSO links may be deteriorated significantly by scintillation and weather conditions (fog/cloud). Hybrid FSO-RF communication is an attractive alternate to handle the issues encountered in individual channels. We propose a novel flexible adaptive hybrid FSO-RF (FAHOR) communication system for reliable transmission under varying weather conditions. We develop adaptive modulation and power allocation rules for maximum FAHOR mutual information (MI) which gives significant improvement of 2.5 dBs over non-adaptive schemes.