Impact of Link Parameters and Channel Correlation on the Performance of FSO Systems With the Differential Signaling Technique

Mansour Abadi, Mojtaba, Ghassemlooy, Zabih, Zvanovec, Stanislav, Bhatnagar, Manav, Khalighi, Mohammad-Ali and Wu, Yongle (2017) Impact of Link Parameters and Channel Correlation on the Performance of FSO Systems With the Differential Signaling Technique. Journal of Optical Communications and Networking, 9 (2). pp. 138-148. ISSN 1943-0620

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Official URL: https://doi.org/10.1364/JOCN.9.000138

Abstract

We investigate the effects of link parameters and the channel correlation coefficient on the detection threshold, Q-factor, and bit-error-rate (BER) of a free-space optical system employing a differential signaling scheme. In systems employing differential signaling schemes, the mean value of the signal is used as the detection threshold level, provided that differential links are identical or highly correlated. However, in reality, the underlying links are not essentially identical and have a low level of correlation. To show the significance of the link parameters as well as the correlation coefficient, we derive analytical relations describing the effect of weak turbulence and we determine the improvement of Q-factor with the channel correlation. Further, for the same signal-to-noise ratio, we demonstrate that a link with a higher extinction ratio offers improved performance. We also propose a closed-form expression of the system BER. We present experimental results showing improved Q-factor for the correlated channel case compared to the uncorrelated channel.

Item Type: Article
Uncontrolled Keywords: Optical communication; free space optical (FSO) communication; differential signalling; on-off keying; channel estimation; atmospheric turbulence
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 08 Mar 2017 15:04
Last Modified: 11 May 2017 22:22
URI: http://nrl.northumbria.ac.uk/id/eprint/30042

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