Double-Laser Differential Signaling for Reducing the Effect of Background Radiation in Free-Space Optical Systems

Khalighi, Mohammad-Ali; Xu, Fang; Jaafar, Yacine; Bourennane, Salah

doi:10.1364/jocn.3.000145

Cited by 48 publications

(58 citation statements)

References 10 publications

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“…In order to reduce the impact of the background noise in [16] two laser wavelengths at the Tx and working in a differential mode at the Rx were investigated for OOK and pulse position modulation (PPM), where special signalling schemes were proposed to increase the transmission rate at the same time. Differential coherent detection is a simple way of achieving carrier synchronisation with phase shift keying (PSK).…”

Section: Introductionmentioning

confidence: 99%

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

Abadi¹,

Ghassemlooy²,

Zvánovec

et al. 2017

J. Opt. Commun. Netw.

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Abstract-We investigate the effects of link parameters and the channel correlation coefficient on the detection threshold, -factor, and bit-errorrate (BER) of a free space optical system employing the differential signalling scheme. In systems employing differential signalling scheme, 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 -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 -factor for the correlated channel case, compared to the uncorrelated channel.

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Section: Introductionmentioning

confidence: 99%

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

Abadi¹,

Ghassemlooy²,

Zvánovec

et al. 2017

J. Opt. Commun. Netw.

Self Cite

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show abstract

“…In [10], a similar DS-based technique was proposed to reduce the effect of background noise in the received signal. We carried out the above experiment in both dark and fully lit environments (with ambient light power level of −45 dBm and −18 dBm, respectively), see Table II.…”

Section: Experimental Measurementsmentioning

confidence: 99%

“…In outdoor FSO links, differential signaling (DS) was used in [10] to remove the effect of background noise. Also the same idea was adopted in [2] that used a pre-fixed optimal DTL for various atmospheric channel conditions (rain, AT, etc.).…”

Section: Introductionmentioning

confidence: 99%

FSO Detection Using Differential Signaling in Outdoor Correlated-Channels Condition

Abadi

Ghassemlooy

Khalighi

et al. 2016

IEEE Photon. Technol. Lett.

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Abstract-In this paper, we introduce a detection technique based on differential signaling scheme for outdoor free space optical communications. This method requires no channel state information (CSI) and does not suffer from the computational load compared to conventional receivers, where adjusting dynamically the detection threshold level (either based on CSI knowledge, or by using pilots) leads to increased computational time and reduced link throughput. This paper shows that the performance of the proposed technique only depends on the correlation of propagating optical beams. Especially under highly correlated-channels condition the fluctuation of the detection threshold level in the receiver is significantly small. We also show experimentally that under weak turbulence regime the variance of detection threshold level reduces for the correlated channel.

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“…At the receiver, we perform optimal detection based on adaptive threshold setting [19], assuming perfect channel knowledge. Without loss of generality, we assume that the dominant noise source at the receiver is the background noise and model it by an additive white Gaussian noise [20]. We also set the transmit (on) signal intensity and the opticalto-electrical conversion efficient to one.…”

Section: B Ber Analysismentioning

confidence: 99%

Approximation to the Sum of Two Correlated Gamma-Gamma Variates and its Applications in Free-Space Optical Communications

Yang

Khalighi

Bourennane

et al. 2012

IEEE Wireless Commun. Lett.

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Abstract-The Gamma-Gamma (ΓΓ) distribution is popularly accepted for modeling the received intensity fluctuations in the near-ground free-space optical (FSO) communication. We consider in this letter the case of dual space diversity FSO systems when the fading coefficients corresponding to the two sub-channels are correlated. In order to evaluate the receiver performance analytically, we propose to approximate the sum of correlated ΓΓ random variables by an α-µ distribution. We show that there is a good match between the performance obtained by simulated data based on the ΓΓ channel model and that obtained from analytical calculation based on the approximate α-µ model.

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Double-Laser Differential Signaling for Reducing the Effect of Background Radiation in Free-Space Optical Systems

Cited by 48 publications

References 10 publications

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

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

FSO Detection Using Differential Signaling in Outdoor Correlated-Channels Condition

Approximation to the Sum of Two Correlated Gamma-Gamma Variates and its Applications in Free-Space Optical Communications

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