BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence

Popoola, Wasiu Oyewole and Ghassemlooy, Zabih (2009) BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence. Journal of Lightwave Technology, 27 (8). pp. 967-973. ISSN 0733-8724

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Official URL: http://dx.doi.org/10.1109/JLT.2008.2004950


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.

Item Type: Article
Uncontrolled Keywords: gamma-gamma distribution, negative exponential distribution, probability density function, random atmospheric temperature fluctuations, receiver, signal-to-noise ratio, spatial diversity, subcarrier intensity modulation, two direct detection PIN photodetectors
Subjects: H600 Electronic and Electrical Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: EPrint Services
Date Deposited: 20 Aug 2009 08:45
Last Modified: 17 Dec 2023 12:06
URI: https://nrl.northumbria.ac.uk/id/eprint/2748

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