Performance Analysis of Free-Space Optical Systems in Gamma-Gamma Fading

Bayaki, E.; Schober, Robert; Mallik, Ranjan K.

doi:10.1109/glocom.2008.ecp.548

Cited by 33 publications

(24 citation statements)

References 32 publications

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“…Turbulence results in increasing BER, while attenuation results in reduced received power [2]. Among the many distributions to characterize a turbulent channel, a gamma-gamma distribution adequately models all the three regimes of turbulence; weak, medium, strong [8]. The distribution is as given below [3]:…”

Section: Laot Atmospheric Modelingmentioning

confidence: 99%

Optimal Lasercom Satellite Transmitter Based on Performance Prediction and Design Adaptation

Devarajan

Pillai²,

Sreelatha³

2014

2014 Fourth International Conference on Advances in Computing and Communications

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Laser communication or lasercom which is the wireless counterpart of optical fiber communication, inherits all its potential properties. Even so, laser beam is gravely affected by atmospheric conditions. Unlike designing conventional communication systems, lasercom satellite system design is complex. The design should accommodate the various stochastic atmospheric conditions and should also evolve accordingly to maintain optimal performance. This necessitates the need for a mechanism that aids in such designing. This paper presents a novel approach of such a prototype named Lasercom Adaptively Optimizing Transmitter (LAOT), that adaptively optimize the system by suitably selecting the optimum transmission design parameter combination as per the atmospheric conditions prevailing during transmission. This is realized through a process of evaluation and prediction, based on virtual communications through atmospheric modeling done as per current atmospheric condition. Optimization is done with respect to the communication parameters, BER and link margin. The proposed prototype can give an optimum performance throughout for the varying atmospheric conditions, by maintaining the BER at a desired value and link margin above a specific positive value. It also incorporates a knowledge base comprising the research results and a learning mechanism, thus making LAOT intelligible in deciding optimum design parameters. The design presented is in the context of satellite downlink scenario. The paper discusses the design, optimization workflow, implementation, and further improvisations on LAOT.

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Section: Laot Atmospheric Modelingmentioning

confidence: 99%

Optimal Lasercom Satellite Transmitter Based on Performance Prediction and Design Adaptation

Devarajan

Pillai²,

Sreelatha³

2014

2014 Fourth International Conference on Advances in Computing and Communications

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“…In this section, we will therefore study the behavior of (26) and (34) for high SNR values ( → ∞). In particular, we derive expressions for the resulting (asymptotic) diversity order 6 ≜ lim…”

Section: Asymptotic Analysis and Diversity Ordermentioning

confidence: 99%

On the performance of non-coherent transmission schemes with equal-gain combining in generalized Κ-fading

Zhu

Mietzner

Schober

2010

IEEE Trans. Wireless Commun.

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The generalized -fading model, characterized by two parameters, and , is a very versatile model and was recently shown to accurately capture the effects of composite shadowing and multipath fading in wireless communication systems. Furthermore, it can be used to model cascade multipath fading, which is relevant in, e.g., mobile-to-mobile communication scenarios. In this paper, we derive closed-form expressions for the bit error probability of two non-coherent transmission schemes over diversity branches being subject to generalized -fading. Specifically, focus is on binary differential phase-shift keying (DPSK) and binary non-coherent frequency-shift keying (FSK) modulation with (post-detection) equal-gain combining at the receiver. We also discuss the extension of our results to -ary modulation schemes. Considering both independent and correlated fading across the branches, we derive expressions for the asymptotic diversity order, which reveal an interesting interplay between the two fading parameters and . Moreover, we show that the diversity order of the considered non-coherent transmission schemes is the same as in the case of a coherent transmission scheme. Finally, numerical performance results are presented, and our analytical results are corroborated by means of Monte-Carlo simulations.

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“…Hence, according to (8), the unknown distribution of S γ can be approximated by the distribution of the RVŜ γ , which is defined as…”

Section: A Identical Variatesmentioning

confidence: 99%

“…In the context of OW communications, the statistics of the sum of GG variates have been used in the performance analysis of MIMO systems operating over GG turbulence model and employing equal gain combining (EGC) at the receiver. In [8], the performance of such a system is investigated over identical OW links, using an infinite power series respresentation for the probability density function (PDF) of the turbulence-induced fading term at the output of the receiver. Although this approach allows the derivation of simple and accurate expressions at the high SNR regime, it is not computationally attractive when the number of the transmit/receive apertures increases and/or the underlying OW links are non identically distributed.…”

Section: Introductionmentioning

confidence: 99%

On the Distribution of the Sum of Gamma-Gamma Variates and Application in MIMO Optical Wireless Systems

Chatzidiamantis

Karagiannidis

Michalopoulos

2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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We present a novel approach for the accurate approximation, via closed-form expressions, of the distribution of the sum of independent and not necessarily identically distributed Gamma-Gamma (GG) variates. It is shown that the probability density function (PDF) of the GG sum can be efficiently approximated either by the PDF of a single GG distribution, or by a finite weighted sum of PDFs of GG distributions. Ascertaining on this result, the performance of multiple input multiple output (MIMO) optical wireless (OW) systems is investigated and approximative closed-form expressions for important performance metrics are derived. Numerical results and simulations illustrate the accuracy of the proposed approach.

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Performance Analysis of Free-Space Optical Systems in Gamma-Gamma Fading

Cited by 33 publications

References 32 publications

Optimal Lasercom Satellite Transmitter Based on Performance Prediction and Design Adaptation

Optimal Lasercom Satellite Transmitter Based on Performance Prediction and Design Adaptation

On the performance of non-coherent transmission schemes with equal-gain combining in generalized Κ-fading

On the Distribution of the Sum of Gamma-Gamma Variates and Application in MIMO Optical Wireless Systems

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