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I need the matlab code for polarization shift keying for free space optical communication in gamma gamma channel to study the atmospheric turbulence. Accepted Answer. Walter Roberson on 17 Feb Cancel Copy to Clipboard. You write to the authors of the paper and you ask them for the source. If they do not answer or if they decline, then you write the code yourself. More Answers 0. See Also. Tags polarization shift keying free space optical communication gamma gamma channel coherent heterodyne receiver.
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Select a Web Site Choose a web site to get translated content where available and see local events and offers.Ghassemlooy, W. Popoola, S. Published by CRC Press. The delivery method makes the book appropriate for students studying at undergraduate and graduate levels as well as researchers and professional engineers working in the field of OWC.
The book gives a detailed description of OWC, focusing mainly on the infrared and visible bands, for indoor and outdoor applications. A major attraction of the book is the inclusion of Matlab codes and simulations results as well as experimental test-beds for free space optics and visible light communication systems.
This valuable resource will aid the readers in understanding the concept, carrying out extensive analysis, simulations, implementation and evaluation of OWC links. Your email address will not be published. Forgot your password?
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Access provided by: anon Sign Out. Alamouti-type space-time coding for free-space optical communication with direct detection Abstract: A modification of the Alamouti code originally proposed for RF wireless applications is described that allows it to be applied in scenarios such as free-space optical communication with direct detection where unipolar modulations like pulse-position modulation and on-off keying are traditionally used to convey the information.
The modification of the code and associated decision metric is such as to maintain all of the desirable properties of the original scheme.
Article :. Date of Publication: 17 January DOI: Need Help?Updated 21 Jun Ethan Png Retrieved April 12, Hi, thank you so much for sharing the knowledge. Is it possible to implement the simulation using Laser Diode?
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Visible Light Communication version 2.
Simulink Model Design for FSO Communication System for Analysing Of Different Parameters
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Performance of OFDM: FSO Communication System with Hybrid Channel Codes during Weak Turbulence
Search Support Clear Filters. Support Answers MathWorks. Search MathWorks. MathWorks Answers Support. Open Mobile Search. Trial software. You are now following this question You will see updates in your activity feed. You may receive emails, depending on your notification preferences. Maria Abraham on 26 Nov Vote 0.
Jaimit Vala on 4 Nov Cancel Copy to Clipboard. Please send me too. I wants this code for my project. Any help appreciated. Answers 1.The performance of orthogonal frequency division multiplexing- OFDM- based free-space optics FSO depends on various parameters such as number of subcarriers, base band modulation, nature of laser beam, turbulence modelling, and much more.
Various diversity techniques have been studied by researchers for the improvement of signal strength due to fading caused by atmospheric turbulence. In this paper, a novel channel coding scheme formed by serially concatenation of irregular low-density parity check LDPC and trellis code modulation TCM codes linked by interleaver is proposed.
The proposed unified coding scheme is simulated and analyzed using the lognormal scintillation model, which is suitable for weak turbulent conditions. The obtained results are the comparative study of various channel coding schemes in terms of bit error rate BER vs. Simulation results confirm that newly designed hybrid code outperforms the independently coded and uncoded systems under weak turbulence conditions by reducing the number of errors in the transmitted information that occurs due to fading.
It is found that the presented hybrid coded OFDM-FSO system with level quadrature amplitude modulation QAM provides significant improvement with less decoding complexity and reasonable delay. FSO has various knock-on effects in military applications, disaster recovery, backhaul connectivity, and line-of-sight LOS link for communication between planes, ships etc. Because of atmospheric turbulence conditions, link performance droops due to water particles and aerosols, which causes changes in the refractive index, affecting the propagation of the LASER beam through atmosphere [ 34 ].
Atmospheric turbulence provides high hindrance as LOS requirement is not contended. Various diversity techniques have been analyzed in the earlier research for reducing the impact of turbulence on the performance of FSO link [ 56 ]. Among various atmospheric aspects such as rain, haze, snow, hail, and fog, the major deterrent that affects the consistency and reliability of the FSO link is fog [ 7 ].
While data transmission through free space, it is foreseen that channel encoding plays the utmost important role and contributes for better performance of data carriage. The various channel coding schemes also known as forward error correction FEC schemes have been used in FSO communication due to their pros such as containing numerous valid code words, transmitting quickly, and detecting or correcting block of errors [ 8 — 11 ]. Convolutional coding CC has been considered as powerful error-correcting codes as proved by Fang et al.
In most cases, it makes a good compromise between performance and decoding complexity, so it becomes a suitable choice for transmission of data through wireless means, whereas, in the presence of intrachannel nonlinear effects, low-density parity-check LDPC codes outperform the turbo-product codes in burst error-prone channels such as the optical fiber channel [ 1314 ].
Simple trellis-coded modulation TCM codes itself are a hybrid scheme having a combination of coder and modulator and are appropriate for signal transmission in FSO communication because of its worthier performance or rise in throughput in bits per second with sophisticated coding gain. TCM improves the noise immunity of digital communication systems without data-rate reduction or bandwidth expansion [ 1516 ].
Wavelength division multiplexing WDM multiplexes the multiple optical carriers into single fiber [ 1718 ], whereas orthogonal frequency division multiplexing OFDM is chosen for multicarrier modulation because of its inherent resilience to frequency selectiveness of the optical communication channel [ 19 ]. For mitigation of short-term loss of signal strength due to fading, other diversity techniques such as time diversity and spatial diversity have also been studied by Lee and Chan in [ 20 ].
The remainder of the paper is organized as follows. In Section 2the system model and general assumptions are presented. Next, simulation results are discussed in Section 3and Section 4 has shown the comparative analysis of various channel coding schemes.
Finally, Section 5 concludes the paper. While it can be difficult to realize perfect knowledge of the turbulence distribution, it is feasible to find and make use of the statistical moments of the turbulence. The commonly used statistical models for depicting atmospheric turbulence channels are the gamma-gamma model, negative exponential, lognormal distribution model, K-distribution model, and I-K distribution.
The lognormal distribution is suitable for weak turbulence and characterizes wireless optical communications links over few hundred meters during the clear weather conditions [ 15 ].
The K-distribution model is fit for characterizing strong turbulence.Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. In our dissertation work, an approach has been made to analyze the effect of free space transfer function by considering various parameters like path loss factor, atmospheric turbulence, pointing errors on the performance of free space optical FSO communication system.
Save to Library. Create Alert. Launch Research Feed. Share This Paper. Figures from this paper. References Publications referenced by this paper. Free-space optical communication through atmospheric turbulence channels Xiaoming ZhuJoseph M. Communications Performance bounds for coded free-space optical communications through atmospheric turbulence channels Xiaoming ZhuJoseph M.
Mathematical model for the irradiance probability density function of a laser beam propagating through turbulent media M.
Al-HabashLarry C. AndrewsRonald L. Phillips Physics Wireless communications - principles and practice Theodore S. Rappaport Engineering, Computer Science BorellaJason P. JueDhritiman BanerjeeB. RamamurthyBiswanath Mukherjee Engineering Spread spectrum fiber-optic local area network using optical processing Paul R.