NDLI: Fading Reduction by Aperture Averaging and Spatial Diversity in Optical Wireless Systems

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IEEE/OSA Journal of Optical Communications and Networking - front cover

Journal of Optical Communications and Networking [Masthead]

Table of contents

Performance Analysis of Spectral Amplitude Encoding OCDM Systems Over a Linear Dispersive Optical Channel

Exact Analysis of Single-Wavelength Optical Buffers With Feedback Markov Fluid Queues

Analysis of Blocking Probability in Noise- and Cross-Talk-Impaired All-Optical Networks

Suppression of Fiber Nonlinearities and PMD in Coded-Modulation Schemes With Coherent Detection by Using Turbo Equalization

Self-Restorable WDM-PON With a Color-Free Optical Source

Remote Frequency Stabilization Technique by Using MZI-AWG and Supervisory Frame Transfer in Coexistence-Type WDM-PON

Fading Reduction by Aperture Averaging and Spatial Diversity in Optical Wireless Systems

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Fading Reduction by Aperture Averaging and Spatial Diversity in Optical Wireless Systems

Content Provider	IEEE Xplore Digital Library
Author	Khalighi, M.-A. Schwartz, N. Aitamer, N. Bourennane, S.
Copyright Year	2009
Abstract	Atmospheric turbulence can cause a significant performance degradation in free-space optical communication systems. It is well known that the effect of turbulence can be reduced by performing aperture averaging and/or employing spatial diversity at the receiver. In this paper, we provide a synthesis on the effectiveness of these techniques under different atmospheric turbulence conditions from a telecommunication point of view. In particular, we quantify the performance improvement in terms of average bit error rate (BER) and outage capacity, which are among important parameters in practice. The efficiency of channel coding and the feasibility of exploiting time diversity in aperture averaging receivers are discussed as well. We also compare single- and multiple-aperture systems from the point of view of fading reduction by considering uncorrelated fading on adjacent apertures for the latter case. We show that when the receiver is background noise limited, the use of multiple apertures is largely preferred to a single large aperture under strong turbulence conditions. A single aperture is likely to be preferred under moderate turbulence conditions, however. When the receiver is thermal noise limited, even under strong turbulence conditions, the use of multiple apertures is interesting only when working at a very low BER. We also provide discussions on several practical issues related to system implementation.
File Size	376338
File Format	PDF
ISSN	19430620
Volume Number	1
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	OSA
Subject Keyword	Fading Apertures Optical receivers Optical transmitters Bit error rate Delay Optimized production technology Degradation Channel coding Optical noise Free-space optics Atmospheric turbulence Aperture averaging Spatial diversity
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications

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