Error rate performance for STBC in free-space optical communications through strong atmospheric turbulence

García-Zambrana, Antonio

doi:10.1109/lcomm.2007.061980

Cited by 59 publications

(18 citation statements)

References 8 publications

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“…The amplitude fluctuation of the field traversing the turbulent medium in this situation is generally believed and experimentally verified [7], [19], [20] to obey the Rayleigh distribution implying negative exponential statistics for the irradiance. That is (4) where is the mean irradiance which is often normalized to unity.…”

Section: B Negative Exponential Modelmentioning

confidence: 90%

BPSK Subcarrier Intensity Modulated Free-Space Optical Communications in Atmospheric Turbulence

Popoola

Ghassemlooy

2009

J. Lightwave Technol.

507

295

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Abstract-Free-space optical communications (FSO) propagated over a clear atmosphere suffers from irradiance fluctuation caused by small but random atmospheric temperature fluctuations. This results in decreased signal-to-noise ratio (SNR) and consequently impaired performance. In this paper, the error performance of the FSO using a subcarrier intensity modulation (SIM) based on a binary phase shift keying (BPSK) scheme in a clear but turbulent atmosphere is presented. To evaluate the system error performance in turbulence regimes from weak to strong, the probability density function (pdf) of the received irradiance after traversing the atmosphere is modelled using the gamma-gamma distribution while the negative exponential distribution is used to model turbulence in the saturation region and beyond. The effect of turbulence induced irradiance fluctuation is mitigated using spatial diversity at the receiver. With reference to the single photodetector case, up to 12 dB gain in the electrical SNR is predicted with two direct detection PIN photodetectors in strong atmospheric turbulence.

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Section: B Negative Exponential Modelmentioning

confidence: 90%

BPSK Subcarrier Intensity Modulated Free-Space Optical Communications in Atmospheric Turbulence

Popoola

Ghassemlooy

2009

J. Lightwave Technol.

507

295

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“…For instance, for the case of two transmitter beams, a modified Alamouti scheme [15] is proposed in [16] which is adapted to IM/DD optical systems by introducing a bias to overcome unipolar signaling used in these systems. This idea is then generalized in [17] to ON-OFF keying (OOK) modulation with any pulse shape. In fact, Both RC and OSTBCs provide full diversity but RC is shown to outperform the latter, and the performance gap increases with increased number of transmitter beams [18].…”

Section: Space-time Coding For Mimo Fso Systemsmentioning

confidence: 99%

Contrasting space-time schemes for MIMO FSO systems with non-coherent modulation

Yang

Khalighi

Virieux

et al. 2012

2012 International Workshop on Optical Wireless Communications (IWOW)

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) Abstract-For the case of multiple-input multiple-output (MIMO) free-space optical (FSO) communication systems, we consider the suitability of the spatial multiplexing scheme when on-off keying modulation is employed. We show that, even with the optimal maximum likelihood detection at the receiver, the performance is worse, compared to the case of repetition coding (RC) under the condition of equal transmission rate. This confirms the quasi-optimality of the RC scheme for MIMO FSO systems. I. INTRODUCTIONFree-space optical (FSO) communication is well known for its advantages of license-free spectrum, high data-rate, low energy consumption, and inherent security, compared to radio frequency (RF) systems [1]. In near-ground FSO systems, one of the principal channel impairments is the atmospheric turbulence which induces intensity fluctuations at the receiver that can considerably degrade the system performance [2]. One solution for fading mitigation is aperture averaging [3]. However, when working at long link distances, the required collecting lens for efficient fading reduction becomes too large [4]. Under such conditions, spatial diversity is a more suitable solution [5]. In particular, significant fading reduction can be obtained through the use of multiple apertures at the receiver and multiple beams at the transmitter [6], [7]. For these multiple-input multiple-output (MIMO) systems, one important question is how to combine the informationbearing symbols at the transmitter in order to optimize the system performance, what is classically called space-time (ST) coding. This is an extensively-developed subject in RF systems. Here, we focus on the spatial multiplexing (SMux) scheme, where the information bearing signals are just multiplexed at the transmitter. The interest of SMux is that it has the maximum transmission rate. Our aim is to investigate the practical interest of this scheme by taking ...

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“…In [7], Simon et al proposed a modified Alamouti code [8] for an irradiance modulation and direct detection (IMIDD) wac system employing OaK and PPM. In [9], Garcia-Zambrana adopted a generalized approach to study space-time coded OaK wac systems based on the work in [7]. Later, Safari et al extended the work in [7] for arbitrary number of transmit lasers [10].…”

Section: Introductionmentioning

confidence: 99%

Alamouti-type STBC for subcarrier intensity modulated wireless optical communications

Song

Cheng

2012

2012 IEEE Global Communications Conference (GLOBECOM)

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We study the error rate of a subcarrier intensity modulated multiple-input multiple-output wireless optical com munication system employing phase-shift keying and Alamouti code. Closed-form error rate expressions are derived using a moment generating function approach with a series expansion of the modified Bessel function. Truncation error analysis and asymptotic error rate analysis are also presented. Our asymptotic analysis shows that the diversity order of the system depends only on the smaller channel parameter. The numerical results demonstrate that our series solutions are efficient and highly accurate.

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Error rate performance for STBC in free-space optical communications through strong atmospheric turbulence

Cited by 59 publications

References 8 publications

BPSK Subcarrier Intensity Modulated Free-Space Optical Communications in Atmospheric Turbulence

BPSK Subcarrier Intensity Modulated Free-Space Optical Communications in Atmospheric Turbulence

Contrasting space-time schemes for MIMO FSO systems with non-coherent modulation

Alamouti-type STBC for subcarrier intensity modulated wireless optical communications

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