Using differential signalling to mitigate pointing errors effect in FSO communication link

Mojtaba Mansour Abadi, Zabih Ghassemlooy, Manav Bhatnagar, Stanislav Zvanovec, Mohammad-Ali Khalighi, Alireza Maheri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

In this paper, we investigate a differential signalling (DS) scheme to mitigate pointing errors effect in intensity-modulation/direct-detection (IM/DD) free space optical (FSO) communication systems with the non-return-to-zero on-off keying (NRZ-OOK) modulation format. The most common approach to detect a digital signal is based on comparing the received signal with an optimal threshold level. Normally, this optimal threshold level is set at the mean value of the signal in a clear channel. However, this detection threshold method is inefficient in a channel with fading effects. DS has been reported to mitigate the fluctuation of optimal detection threshold in NRZ-OOK IM/DD FSO communication systems only to combat atmospheric fading effects (e.g., fog and turbulence) and to reduce the background noise of the received signal. In this paper, we adopt the DS scheme to mitigate the optimal detection threshold level fluctuations induced by pointing errors. We also discuss the conditions in which DS cancels out the fluctuation of threshold level. The proposed technique is supported by carrying out experimental investigation of the FSO link with pointing errors. Measured results confirm that the effect of PE on the received signal was highly correlated (i.e., rho = 0.92, where rho is the correlation coefficient between channels) thus resulting in reduced variance value of the combined signal threshold level. We also derive an expression for bit-error-rate for the system which is supported by simulation.
Original languageEnglish
Title of host publication2016 IEEE International Conference on Communications Workshops (ICC 2016)
PublisherIEEE Explore
Pages145-150
Number of pages6
ISBN (Print)9781509004492
Publication statusPublished - 1 May 2016

Fingerprint

free-space optical communication
thresholds
keying
fading
modulation
telecommunication
fog
combat
background noise
bit error rate
correlation coefficients
format
turbulence

Keywords

  • optical communications
  • free space optics (FSO)
  • pointing errors
  • threshold detection

Cite this

Abadi, M. M., Ghassemlooy, Z., Bhatnagar, M., Zvanovec, S., Khalighi, M-A., & Maheri, A. (2016). Using differential signalling to mitigate pointing errors effect in FSO communication link. In 2016 IEEE International Conference on Communications Workshops (ICC 2016) (pp. 145-150). IEEE Explore.

Using differential signalling to mitigate pointing errors effect in FSO communication link. / Abadi, Mojtaba Mansour; Ghassemlooy, Zabih; Bhatnagar, Manav; Zvanovec, Stanislav; Khalighi, Mohammad-Ali; Maheri, Alireza.

2016 IEEE International Conference on Communications Workshops (ICC 2016). IEEE Explore, 2016. p. 145-150.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abadi, MM, Ghassemlooy, Z, Bhatnagar, M, Zvanovec, S, Khalighi, M-A & Maheri, A 2016, Using differential signalling to mitigate pointing errors effect in FSO communication link. in 2016 IEEE International Conference on Communications Workshops (ICC 2016). IEEE Explore, pp. 145-150.
Abadi MM, Ghassemlooy Z, Bhatnagar M, Zvanovec S, Khalighi M-A, Maheri A. Using differential signalling to mitigate pointing errors effect in FSO communication link. In 2016 IEEE International Conference on Communications Workshops (ICC 2016). IEEE Explore. 2016. p. 145-150
Abadi, Mojtaba Mansour ; Ghassemlooy, Zabih ; Bhatnagar, Manav ; Zvanovec, Stanislav ; Khalighi, Mohammad-Ali ; Maheri, Alireza. / Using differential signalling to mitigate pointing errors effect in FSO communication link. 2016 IEEE International Conference on Communications Workshops (ICC 2016). IEEE Explore, 2016. pp. 145-150
@inproceedings{3687f63813a34fbe9f17fd94f96d3e09,
title = "Using differential signalling to mitigate pointing errors effect in FSO communication link",
abstract = "In this paper, we investigate a differential signalling (DS) scheme to mitigate pointing errors effect in intensity-modulation/direct-detection (IM/DD) free space optical (FSO) communication systems with the non-return-to-zero on-off keying (NRZ-OOK) modulation format. The most common approach to detect a digital signal is based on comparing the received signal with an optimal threshold level. Normally, this optimal threshold level is set at the mean value of the signal in a clear channel. However, this detection threshold method is inefficient in a channel with fading effects. DS has been reported to mitigate the fluctuation of optimal detection threshold in NRZ-OOK IM/DD FSO communication systems only to combat atmospheric fading effects (e.g., fog and turbulence) and to reduce the background noise of the received signal. In this paper, we adopt the DS scheme to mitigate the optimal detection threshold level fluctuations induced by pointing errors. We also discuss the conditions in which DS cancels out the fluctuation of threshold level. The proposed technique is supported by carrying out experimental investigation of the FSO link with pointing errors. Measured results confirm that the effect of PE on the received signal was highly correlated (i.e., rho = 0.92, where rho is the correlation coefficient between channels) thus resulting in reduced variance value of the combined signal threshold level. We also derive an expression for bit-error-rate for the system which is supported by simulation.",
keywords = "optical communications, free space optics (FSO), pointing errors, threshold detection",
author = "Abadi, {Mojtaba Mansour} and Zabih Ghassemlooy and Manav Bhatnagar and Stanislav Zvanovec and Mohammad-Ali Khalighi and Alireza Maheri",
year = "2016",
month = "5",
day = "1",
language = "English",
isbn = "9781509004492",
pages = "145--150",
booktitle = "2016 IEEE International Conference on Communications Workshops (ICC 2016)",
publisher = "IEEE Explore",

}

TY - GEN

T1 - Using differential signalling to mitigate pointing errors effect in FSO communication link

AU - Abadi, Mojtaba Mansour

AU - Ghassemlooy, Zabih

AU - Bhatnagar, Manav

AU - Zvanovec, Stanislav

AU - Khalighi, Mohammad-Ali

AU - Maheri, Alireza

PY - 2016/5/1

Y1 - 2016/5/1

N2 - In this paper, we investigate a differential signalling (DS) scheme to mitigate pointing errors effect in intensity-modulation/direct-detection (IM/DD) free space optical (FSO) communication systems with the non-return-to-zero on-off keying (NRZ-OOK) modulation format. The most common approach to detect a digital signal is based on comparing the received signal with an optimal threshold level. Normally, this optimal threshold level is set at the mean value of the signal in a clear channel. However, this detection threshold method is inefficient in a channel with fading effects. DS has been reported to mitigate the fluctuation of optimal detection threshold in NRZ-OOK IM/DD FSO communication systems only to combat atmospheric fading effects (e.g., fog and turbulence) and to reduce the background noise of the received signal. In this paper, we adopt the DS scheme to mitigate the optimal detection threshold level fluctuations induced by pointing errors. We also discuss the conditions in which DS cancels out the fluctuation of threshold level. The proposed technique is supported by carrying out experimental investigation of the FSO link with pointing errors. Measured results confirm that the effect of PE on the received signal was highly correlated (i.e., rho = 0.92, where rho is the correlation coefficient between channels) thus resulting in reduced variance value of the combined signal threshold level. We also derive an expression for bit-error-rate for the system which is supported by simulation.

AB - In this paper, we investigate a differential signalling (DS) scheme to mitigate pointing errors effect in intensity-modulation/direct-detection (IM/DD) free space optical (FSO) communication systems with the non-return-to-zero on-off keying (NRZ-OOK) modulation format. The most common approach to detect a digital signal is based on comparing the received signal with an optimal threshold level. Normally, this optimal threshold level is set at the mean value of the signal in a clear channel. However, this detection threshold method is inefficient in a channel with fading effects. DS has been reported to mitigate the fluctuation of optimal detection threshold in NRZ-OOK IM/DD FSO communication systems only to combat atmospheric fading effects (e.g., fog and turbulence) and to reduce the background noise of the received signal. In this paper, we adopt the DS scheme to mitigate the optimal detection threshold level fluctuations induced by pointing errors. We also discuss the conditions in which DS cancels out the fluctuation of threshold level. The proposed technique is supported by carrying out experimental investigation of the FSO link with pointing errors. Measured results confirm that the effect of PE on the received signal was highly correlated (i.e., rho = 0.92, where rho is the correlation coefficient between channels) thus resulting in reduced variance value of the combined signal threshold level. We also derive an expression for bit-error-rate for the system which is supported by simulation.

KW - optical communications

KW - free space optics (FSO)

KW - pointing errors

KW - threshold detection

M3 - Conference contribution

SN - 9781509004492

SP - 145

EP - 150

BT - 2016 IEEE International Conference on Communications Workshops (ICC 2016)

PB - IEEE Explore

ER -