Modeling and performance analysis of free space optical communication system

Rahman, Md. Tawabur; Iqbal, Shahid; Islam, Md. Monjurul

doi:10.1109/iciev.2012.6317371

Cited by 15 publications

(6 citation statements)

References 11 publications

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“…The mathematical model of each topology in the proposed system is expressed, including the channel gain H and its related factors and the probability density function probability density function (PDF) of the H in weak atmospheric turbulence using Log-normal distribution. The channel's gain factors formulas have been found in [15]. These factors were modified to suit the system's topologies in this paper.…”

Section: Channels Modelingmentioning

confidence: 99%

“…is the radial displacement of the optical beam that is between the aperture center and the beam center, as shown in Figure 2, where is pointing error angle (divergence angle) of the m th channel that must be < 10 −4 rad [23], where this value is for long link distance. For a short distance, can be set > 10 −4 rad as proved in the results section, 0 = [ ( )] 2 is the fraction of collected power at the radial displacement r=0 (no pointing error occurs), and is the equivalent beam radius of the optical beam in the m th channel that can express as [15]:…”

Section: Channels Modelingmentioning

confidence: 99%

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Impact of pointing error on SISO/MISO drones swarm-based free space optical system in weak turbulence regime

Mahdi

Mazher²,

Uçan³

2021

IJEECS

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Applying the drone-based free space optical (FSO) technology is recent in communication systems. The FSO technology hashigh-security features dueto narrow beamwidth, insusceptible to interferences, free license and landline connection is not appropriate. However, these advantages face many obstacles that affect the system's performance, such as random weather conditions and misalignment. The pointing error Hpis one of the critical factors of the channel gain H. The related parameters of the Hp factor: the pointing error angles θr and the path length Z, were manipulated to extract the applicable values at various receiver diameter values. The proposed system has two topologies: single input single output (SISO) and multiple input single output (MISO), flying in weak atmospheric turbulence. The simulation was done using MATLAB software 2020. The average bit error rate (ABER) for the system versus signal-to-noise ratio (SNR) were verified and analyzed. The results showed that at θr=10−3rad, Z increased in the range 10~100m for each one-centimeter increase of DR. At θr=10−2rad, the applicable Z was nearly 10% of the link distance Z when θr=10−3rad was applied. Consequently, an increase in θr must correspond decrease in Z and vice versa to maintain the system at high performance.

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Section: Channels Modelingmentioning

confidence: 99%

Section: Channels Modelingmentioning

confidence: 99%

Impact of pointing error on SISO/MISO drones swarm-based free space optical system in weak turbulence regime

Mahdi

Mazher²,

Uçan³

2021

IJEECS

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“…The line of sight of optical trans-receiver can comprise link availability but there are other factors also like atmospheric attenuation, scattering phenomena [2], multipath fading [8], absorption, turbulence along with link distance, laser wavelength and data rates [9]. Due to these factors the signal deteriorates at receiver and link performance is also deteriorating [5]. The attenuation effect can be the combination of geometric losses as well as atmospheric attenuation.…”

Section: Introductionmentioning

confidence: 98%

“…Line of sight (LOS) is needed to establish a seamless communication link in an FSO system [4]. It offers many advantages like, high data rate, no RF license, no security upgrades, immune to RF interference, low power, increase in system bandwidth and much more [4][5][6][7]. Optical links in which FSO communication can be employed are: building to building, ship to ship, aircraft to ground and satellite to ground [1].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Point to Point FSO System Under Clear and Haze Weather Conditions

Malik

Singh

2014

Wireless Pers Commun

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Free space optics (FSO) is an optical mean of communication where free space acts as a medium between transmitter and receiver and both should be in the line of sight for successful transmission of signal. Free space can be air, outer space, or vacuum. This system is economically beneficial than other systems and deployed in a matter of hours. This system poses great advantages like high bandwidth. There are some factors which can affect the transmission in FSO. Presence of foreign elements like rain, fog, and haze, physical obstruction, scattering and atmospheric turbulence are some of these factors. In this paper, two FSO links are designed and compared using WDM to study under clear and haze weather conditions. The present system supports the transmission up to longer link distances of 350 and 47 km under clear weather and haze conditions respectively.

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“…The architectural design of the eight channels of the Ro-FSO system is similar to that of the four channels of the Ro-FSO system, but Pseudo-Random Binary Sequences (PRBS) could be transmission by 8λ system design. 2 that was used for test performances of Ro-FSO systems designs are taken from ref [17].…”

mentioning

confidence: 99%

Study and Simulation of Transporting Radio Frequency Signals over Free Space Optics for Achieving High Data Rate and Power Saving

Ibrahim

Mansour

2021

Int. J. Interact. Mob. Technol.

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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)

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Modeling and performance analysis of free space optical communication system

Cited by 15 publications

References 11 publications

Impact of pointing error on SISO/MISO drones swarm-based free space optical system in weak turbulence regime

Impact of pointing error on SISO/MISO drones swarm-based free space optical system in weak turbulence regime

Comparative Analysis of Point to Point FSO System Under Clear and Haze Weather Conditions

Study and Simulation of Transporting Radio Frequency Signals over Free Space Optics for Achieving High Data Rate and Power Saving

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