Coherent Optical OFDM (CO-OFDM) represents the ultimate performance in receiver sensitivity and spectral efficiency by overlapping subcarriers spectrum while avoiding interference via the combination of coherent detection and signal set orthogonality. Despite the fact that OFDM has been extensively studied in the radio frequency domain, it is quite surprising that optical OFDM has only been reported in the last two decades. In conclusion, all the above make OFDM an ideal candidate for FSO transmission. OFDM is one of the most popular technique for broadband wireless telecommunications and its known for its increased robustness against frequency selective fading in contrast to single carrier systems, narrow-band interference and high channel efficiency. For the multipath fading what can be attempted is the introduction of multiple carriers modulation as OFDM.
It should also be stated the existence of multipath fading is one of the dominant factors that impoverish the functioning of such systems. However the performance of a FSO link can be degraded by many reasons due to variable atmospheric conditions.
Fix error while calculating component optisystem license#
Cost-effective deployment, license free and high bandwidth access techniques to name a few are elements that classify these systems in the centre of attention for the new telecom technologies. The FSO systems have a number of advantages compared to conventional free space radio frequency systems. An extensive, comparative analysis among different FSO configurations links considering various characteristics of the OFDM modulation, link ranges, Bit Rates (BR) and the atmospherical conditions is provided.įor many years the Free Space Optical (FSO) communication system has been an interesting and promising alternative for the enormous, current telecom demands, providing a solution for broadband networks, especially in geographical areas where optical fiber deployment is not feasible.
In this paper we are studying the performance of a mobile link among co-moving UAVs, UAV and GS at different fixed altitudes and link ranges via Optisystem simulation platform, in terms of Bit Error Rate (BER), Optical Signal to Noise Ratio (OSNR) and constellation diagrams. In order to design a high performance communication link, it is important to characterize the quality of the optical channel with a proper model, considering the interesting challenges of environmental conditions, such as turbulence and visibility conditions. Due to their huge bandwidth, license free spectrum and multipath fading mitigation, the FSO links combined with Orthogonal Frequency Division Multiplexing (OFDM) modulation technique provide an ideal communication solution between Unmanned Aerial Vehicles (UAVs) and fixed Ground Station (GS).
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Abstract: The Free Space Optical (FSO) communication links is a promising and cost-effective solution for the provision of high data rate point to point communications.
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