Abstract
The remarkable technology for seamless integration of wireless and optical networks is radio frequency signals over Free Space Optics (FSO). This research study and simulation examine the design and evaluation performance of Radio Frequency over FSO (RF-FSO) wireless communication technology. These systems are implemented through medium communication link ranges to overcome excessive sensitivity of atmosphere medium and meet the requirements of a wide variety of optical wireless applications. There are two ways to achieve the application of the design mentioned above. The first way is the application of the Three modulation schemes of technology that is Amplitude shift keying (ASK), Quadrature amplitude modulation (QAM), and Quadrature phase-shift keying (QPSK) of digital modulation. The design of these modulation schemes is realized by using optiwave software to study the transmission of RF signals over the FSO channel and compare the three modulation techniques into the RF-FSO system. RF signals with the frequency range from (20 to 60) GHz is used in RF-FSO system and many carrier optical signals where the higher RF has a wider bandwidth to carrying larger information. To increase the transmission of data rates Wavelength Division Multiplexing (WDM) technology is used. The second way is based on a mathematical model which has been proposed for this study. This mathematical model calculates optimal beacon period (BI), and optimal listen interval (LI) to preventing the overlapping of time between the signals and the decrease in the required power. Using different weather conditions samples, the simulation results revealed that the best performance of the RF-FSO system is from link range, and the receiver is more sensitive. The simulation results are as follows: Two independent channels are transmitted 20 Gbps over ranges from (263 m to 6.55 km), while four channels are transmitted 40 Gbps over ranges from (257 m to 5.95 km), and eight independent channels transmit 80 Gbps over distance from (203 m to 5.2 km)
Highlights
Wireless communication technology is widely used in today’s world because of its flexibility and mobility
This research solution for creating Ro-Free Space Optics (FSO) communication system with better performances, Radio frequencies over Free Space Optics (Ro-FSO) is wireless communication networks consist of both FSO and radio over fiber (R-o-F) techniques utilize for removal (RF) signals overcrowding, by optical transmission wave over free space optics carrying radio frequency (RF) signal without the need of using optical fiber
The results of the Ro-FSO communication systems are extracted using “OptiSystem” software to improve the performance of the single-channel Ro-FSO, and multi-channel Wavelength Division Multiplexing (WDM) Ro-FSO systems
Summary
Wireless communication technology is widely used in today’s world because of its flexibility and mobility Due to these characteristics, the number of integrated and deployed applications into the wireless system is increased significantly. The radio wave is a wireless communication system used to transmitted data over the air by digital signal at a frequency range from (3 kHz to 300 GHz), the transmission being bi-directional between a mobile and an antenna [6]. Radio over Free Space Optics communication system consists of a transmitter, receiver, and an atmospheric medium (FSO) communication channel between them for transmission the signals which its passes through it [7]. A gaussian optical filter placed during using WDM to separates the different transmitted wavelength filters for prevention the interference of received signal and power consumption is reduced
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