Multi-transceiver simulation modules for free-space optical mobile ad hoc networks (original) (raw)
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COMPARISON OF DIFFERENT TRANSMITTERS USING 1550NM AND 10000NM IN FSO COMMUNICATION SYSTEMS
In the recent past Free Space Optical (FSO) communication has taken over the radio frequency communication and microwave systems due to its advantages like its long-range operations devoid of need of license. In this paper we will find the most efficient transmitter suitable for free space optical (FSO) communication. The theoretical analysis of behaviour of an FSO wireless communications system is done using on off keying with different transmitters over fog weather conditions. Based on different models for optical beam propagation at 1550nm and 10000nm on an FSO, the bit error rate (BER) and Q-factor under fog weather are analyzed.
Design and performance analysis of FSO (free space optical) networks
IJAERD, 2018
In today's world, the communication has become an integrally of every human. FSO is a line of sight wireless communication system in which the data is transmitted in the form of laser beams. FSO is one of the best communication system because of its highest bandwidth, no need of licensing, maximum transmission data rates with very high security. Since the signal is transmitted via free space, the laser beams are degraded due to turbulent atmosphere.The main aim of this module is to first design a single channel FSO trans-receiver system and then upgrade it to higher number of channels (upto 30 channels). After the design is done and validated multiple simulations are carried out to evaluate the effects/phenomena that limit the performance of the proposed designs and extend their effects on performance evaluating parameters. Then different techniques are proposed that improve the performance evaluating parameters and either eliminate or minimize the effect of noise and distortion effects onto system performance.
Design and Performance Analysis of Fso(Free Space Optical)Network
International Journal of Advance Engineering and Research Development, 2018
In today's world, the communication has become an integrally of every human. FSO is a line of sight wireless communication system in which the data is transmitted in the form of laser beams. FSO is one of the best communication system because of its highest bandwidth, no need of licensing, maximum transmission data rates with very high security. Since the signal is transmitted via free space, the laser beams are degraded due to turbulent atmosphere.The main aim of this module is to first design a single channel FSO trans-receiver system and then upgrade it to higher number of channels (upto 30 channels). After the design is done and validated multiple simulations are carried out to evaluate the effects/phenomena that limit the performance of the proposed designs and extend their effects on performance evaluating parameters. Then different techniques are proposed that improve the performance evaluating parameters and either eliminate or minimize the effect of noise and distortion effects onto system performance.
2017 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS), 2017
This paper presents a new framework for long range Free Space Optical communication (FSO). Motivated by the ever-growing demand for communication in 5G networks, the suggested framework tackles the natural FSO link drawbacks, commonly: complicated installation, limited range, size and pricing. The new FSO concept assumes a "best effort" model. It uses a new control and aiming mechanism for the Tx laser beam based on COTS components. This methodology is mostly suitable for urban FSO links but might also be applicable for both short range (IoT) and long range (satellite) communication. Based on simulations and preliminary field results we expect that such FSO links will be widely used in "best-effort" 5G applications allowing an affordable alternative to fiber optics and standard FSO systems.
Free Space Optical Communication Systems
SPIE eBooks, 2009
Free space optical (FSO) communication has emerged as a viable technology for broadband wireless applications. FSO technology offers the potential of high bandwidth capacity over unlicensed optical wavelengths. On long-range FSO links, atmospheric turbulence causes intensity fluctuations, which degrades links performance. The performance of an optical link can be improved by the use of a time delayed diversity technique, which takes advantage of the fact that the atmospheric path from transmitter to receiver is statistically independent for time intervals beyond the coherence time of the intensity fluctuations. Communications performance is improved because the joint probability of error is less than the probability of error from individual channels. Theoretical analysis and experimental investigation were conducted to assess and characterize the performance of a time delayed diversity FSO system. Two experiments were conducted: inside our laboratory under simulated convective turbulence and inter-building in clear atmospheric turbulence. In both cases, time delayed diversity system is shown to offer a notable performance improvement compared to a non-diversity FSO system, where the signal-to-noise ratio (SNR) performance can gain up to 4.7 dB and the bit error rate (BER) performance is doubled. These experimental studies confirm the effectiveness of a time delayed diversity technique to mitigate turbulence induced fading, and its optimality in a dual diversity scheme. This is the first published report of theoretical and experimental performance characteristics of FSO communication system utilizing time delayed diversity technique. FSO technology has also emerged as a key technology for the development of rapidly deployable and secure communication and surveillance networks. In networking applications, broadcasting capability is frequently required to establish and maintain inter-node communications. One approach to deal with the broadcasting issue in FSO networking is the use of omnidirectional FSO links, which is based on non-directed line-of-sight (LOS) technique. Prototype omnidirectional FSO transceiver had been constructed and their performance investigated. Although omnidirectional FSO links cannot provide the performance of directional ones, the results suggest that they could be used in sensor networks or as alternative for traditional wireless networks, when the use of radio frequency (RF) technology is prohibited.
Mobility in free-space optics based wireless sensor networks
Wireless Sensing and Processing IV, 2009
This paper proposes an FSO-based mobile sensor network that is not subject to RF interference common to wireless sensor networks. FSO-based mobile sensor networks can potentially be used in a battlefield where security of communication, including freedom from susceptibility to enemy-induced jamming, is important. The paper discusses the design of nodes containing multiple transceivers composed of LEDs and photo detectors. Results of initial experiments are included. The work reported in this paper is part of an ongoing investigation on mobile FSO networks, including the design of efficient protocols that can allow the mobile sensor nodes to function as a mesh network permitting information exchange among nodes directly and, possibly, through an intermediate node.
Challenges facing mobile free-space optical communications
Atmospheric Propagation VI, 2009
Significant research efforts are underway to investigate the application of Free-Space Optics (FSO) for the provision of high-bandwidth communications links between mobile platforms. The use of FSO between mobile platforms introduces several interesting challenges in addition to those found in traditional fixed link FSO systems. In this paper, some of the major hurdles facing fixed FSO communications that carry over into links between mobile platforms are analyzed. These topics include: issues with alignment and tracking, an investigation into the weather and its affect on the link, and a study of the feasibility of having uninterrupted communications links. Other topics presented unique to mobile applications include: the security risks during link alignment, maintaining the link while tracking and optical power and beam divergence variations that are introduced into the system. In this paper the results from simulation work performed on some of these issues along with proposed solutions to the challenges are presented. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 10/09/2013 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 7324 73240L-8 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 10/09/2013 Terms of Use: http://spiedl.org/terms
On the Capacity of Hybrid FSO/RF Links
2010
Abstract Hybrid Free Space Optics (FSO)/Radio Frequency (RF) communication systems have emerged as a way to improve network performance by providing enhanced availability and reliability. In an effort to mitigate individual drawbacks in the optical link during adverse weather conditions, network traffic flows simultaneously between channels. Based on the Shannon-Hartley theorem, channel capacity is dependent, among others, on both the signal to noise ratio (SNR) and channel bandwidth.
Packet-based simulation for optical wireless communication
2010 17th IEEE Workshop on Local & Metropolitan Area Networks (LANMAN), 2010
This paper presents packet-based simulation tools for free-space-optical (FSO) wireless communication. We implement the well-known propagation models for free-space-optical communication as a set of modules in NS-2. Our focus is on accurately simulating line-of-sight (LOS) requirement for two communicating antennas, the drop in the received power with respect to separation between antennas, and error behavior. In our simulation modules, we consider numerous factors affecting the performance of optical wireless communication such as visibility in the medium, divergence angles of transmitters, field of view of photo-detectors, and surface areas of transceiver devices.
Building blocks for mobile free-space-optical networks
2005
Existence of line of sight (LOS) and alignment between the communicating antennas are one of the key requirements for free-space-optical (FSO) communication. To ensure uninterrupted data flow, auto-aligning transmitter and receiver modules are necessary. We propose a new optical antenna design that employs spherical antennas covered with transmitter and receiver modules for maintaining optical links even when antennas are in relative motion.