Abstract
From the last few decades' radio frequency (RF) spectrum remained attractive for wireless/wire-line applications. RF spectrum becomes dense and occupied, which makes its availability difficult to other broadband channels. Free space optical (FSO) communication, which was used for messaging/indication in the ancient days, now becomes more popular and attractive in the new era. The popularity of FSO is due to its freely available large spectrum, inherited secure links and ease of deployment. However, FSO link has to face certain challenges, e.g., line-of-sight (LOS) requirement, link attenuation due to atmospheric turbulence and severe weather conditions. To overcome the issues of FSO communication, hybrid optical-radio transmission system is proposed by which we can get maximum benefits of both spectrum. Considering the proposed transmission system link quality, link budget analysis is done in the presented work. Link budget design of transmission system is important to analyze and give recommendations.
Highlights
From the last few decades, the radio frequency (RF) communication has gained market interest because of its enormous benefits
The performance analysis of the hybrid Free space optical (FSO)/RF communication system has been restricted to the atmospheric turbulence induced fading for FSO link in our prior work [5], [6]
A mathematical model that describes the channel from the transmitter to the photodetector output for the intensity modulation/direct detection (IM/DD) FSO communication system, if P be the transmit optical power on the FSO link, x is the FSO symbol transmitted using any of the defined FSO mapping schemes, the received signal1 assuming the signal dependent Gaussian noise (SDGN) model [1], y = (λ + ρgPhx) + ρgPhx + λ + σt2h z (14)
Summary
From the last few decades, the radio frequency (RF) communication has gained market interest because of its enormous benefits. The atmospheric turbulence induced fading, attenuation due to different weather conditions (i.e., fog, snow and smoke)and at last but not the least, the pointing errors. The proposed research work about the hybrid FSO/RF is restricted to scintillation and weather conditions for FSO link and the effect of pointing errors has been ignored. The performance analysis of the hybrid FSO/RF communication system has been restricted to the atmospheric turbulence induced fading for FSO link in our prior work [5], [6]. It is essential to investigate the link budget analysis of the hybrid FSO/RF system considering the effects of scintillation and weather attenuation. Atmospheric attenuation and unpredictability of weather conditions limits the communication distance and affects the link reliability [31], [32].
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