Impact of link parameters and channel correlation on the performance of FSO systems with the differential signaling technique

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 si...

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Bibliographic Details
Published in:Journal of optical communications and networking 2017-02, Vol.9 (2), p.138-148
Main Authors: Abadi, Mojtaba Mansour, Ghassemlooy, Zabih, Zvanovec, Stanislav, Bhatnagar, Manav R., Khalighi, Mohammad-Ali, Wu, Yongle
Format: Article
Language:English
Subjects:
Adaptive optics
Atmospheric turbulence
Channel estimation
Correlation
Correlation coefficients
Differential signaling
Engineering Sciences
Error detection
Free-space optical (FSO) communication
Free-space optical communication
Frequency shift keying
Low level
Mathematical analysis
On-off keying
Optical filters
Optical receivers
Optics
Photonic
Q-factor
Reactive power
Signal and Image processing
Turbulence
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Summary: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.
ISSN:1943-0620
1943-0639
DOI:10.1364/JOCN.9.000138