Performance improvement of FSO/CDMA systems over dispersive turbulence channel using multi-wavelength PPM signaling

doi:10.1364/OE.20.026786

Performance improvement of FSO/CDMA systems over dispersive turbulence channel using multi-wavelength PPM signaling

Ngoc T. Dang and Anh T. Pham »View Author Affiliations

Optics Express, Vol. 20, Issue 24, pp. 26786-26797 (2012)
http://dx.doi.org/10.1364/OE.20.026786

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Abstract

Previous studies show that, compared to on-off keying (OOK) signaling, pulse-position modulation (PPM) is favorable in FSO/CDMA systems thanks to its energy efficiency and simple detection. Nevertheless, when the system bit rate increases and the transmission distance is far, the FSO/CDMA systems using PPM signaling critically suffer from the impact of pulse broadening caused by dispersion, especially when the modulation level is high. In this paper, we therefore propose to use multi-wavelength PPM (MWPPM) signaling to overcome the limitation of PPM. To further improve the system performance, avalanche photodiode (APD) is also used. The performance of the proposed system is theoretically analyzed using a realistic model of Gaussian pulse propagation. To model the impact of intensity fluctuation caused by the atmospheric turbulence, the log-normal channel is used. We find that, by using MWPPM, the effects of both intensity fluctuation and pulse broadening are mitigated, the BER is therefore significantly improved. Additionally, we quantitatively show that the system performance is further improved by using APD, especially when the average APD gain is chosen properly.

OCIS Codes
(060.4510) Fiber optics and optical communications : Optical communications
(060.2605) Fiber optics and optical communications : Free-space optical communication

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: August 21, 2012
Revised Manuscript: November 5, 2012
Manuscript Accepted: November 6, 2012
Published: November 13, 2012

Citation
Ngoc T. Dang and Anh T. Pham, "Performance improvement of FSO/CDMA systems over dispersive turbulence channel using multi-wavelength PPM signaling," Opt. Express 20, 26786-26797 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-24-26786

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References

H. A. Willebrand and B. S. Ghuman, “Fiber optics without fiber,” IEEE Spectrum38, 40–45 (2001). [CrossRef]
Q. Liu, C. Qiao, G. Mitchell, and S. Stanton, “Optical wireless communication networks for first- and last-mile broadband access [Invited],” J. Opt. Netw.4, 807–828 (2005). [CrossRef]
T. Ohtsuki, “Performance analysis of atmospheric optical PPM CDMA systems,” J. Lightwave Technol.21, 406–411 (2003). [CrossRef]
K. Ohba, T. Hirano, T. Miyazawa, and I. Sasase, “A symbol decision scheme to mitigate effects of scintillations and MAIs in optical atmospheric PPM-CDMA systems,” in Proceedings of IEEE GLOBECOM, (St. Louis, 2005), pp. 1999–2003.
M. Jazayerifar and J. A. Salehi, “Atmospheric optical CDMA communication systems via optical orthogonal godes,” J. Lightwave Technol.54, 1614–1623 (2006).
T. Miyazawa and I. Sasase, “BER performance analysis of spectral phase-encoded optical atmospheric PPM-CDMA communication systems,” J. Lightwave Technol.25, 2992–3000 (2007). [CrossRef]
A. T. Pham, T. A. Luu, and N. T. Dang, “Performance bound for Turbo-coded 2-D FSO/CDMA systems over atmospheric turbulence channel,” IEICE Trans. Fundamentals.E93-A, 1745–1337 (2010). [CrossRef]
A. Stok and E. H. Sargent, “The role of optical CDMA in access networks,” IEEE Commun. Mag.40, 83–87 (2002). [CrossRef]
X. Zhu and J. M. Khan, “Free-space optical communication through atmospheric turbulence channels,” IEEE Trans. Commun.50, 1293–1300 (2002). [CrossRef]
C. C. Davis and I. Smolyaninov, “The effect of atmospheric turbulence on bit-error-rate in an on-off keyed optical wireless system,” in Proceedings of SPIE Free-Space Laser Commun. Laser Imaging, (1997), pp. 126–137.
C. Y. Young, L. C. Andrews, and A. Ishimaru, “Time-of-arrival fluctuations of a space-time Gaussian pulse in weak optical turbulence: an analytic solution,” Appl. Opt37, 7655–7660 (1998). [CrossRef]
H. Hemmati, Deep Space Optical Communications (John Wiley and Sons, 2006). [CrossRef]
S. M. Navidpour, M. Uysal, and M. Kavehrad, “BER performance of free-space optical transmission with spatial diversity,” IEEE Trans. Wireless Comm.6, 2813–2819 (2007). [CrossRef]
T. A. Tsiftsis, H.G. Sandalidis, G. K. Karagiannidis, and M. Uysal, “Optical wireless links with spatial diversity over strong atmospheric turbulence channels,” IEEE Trans. Wireless Comm.8, 951–957 (2009). [CrossRef]
E. Bayaki, R. Schober, and R.K. Mallik, “Performance analysis of MIMO free-space optical systems in gamma-gamma fading,” IEEE Trans. Comm.57, 3415–3424 (2009). [CrossRef]
I. Djordjevic, W. Ryan, and B. Vasic, Coding for Optical Channels (Springer, 2010). [CrossRef]
G. Agrawal, Nonlinear Fiber Optics (Academic Press, 2006).
G. C. Yang and W. C. Kwong, Prime Code with Application to CDMA Optical and Wireless Networks (Artech House, 2002).

Appl. Opt

C. Y. Young, L. C. Andrews, and A. Ishimaru, “Time-of-arrival fluctuations of a space-time Gaussian pulse in weak optical turbulence: an analytic solution,” Appl. Opt37, 7655–7660 (1998). [CrossRef]

IEEE Commun. Mag.

A. Stok and E. H. Sargent, “The role of optical CDMA in access networks,” IEEE Commun. Mag.40, 83–87 (2002). [CrossRef]

IEEE Spectrum

H. A. Willebrand and B. S. Ghuman, “Fiber optics without fiber,” IEEE Spectrum38, 40–45 (2001). [CrossRef]

IEEE Trans. Comm.

E. Bayaki, R. Schober, and R.K. Mallik, “Performance analysis of MIMO free-space optical systems in gamma-gamma fading,” IEEE Trans. Comm.57, 3415–3424 (2009). [CrossRef]

IEEE Trans. Commun.

X. Zhu and J. M. Khan, “Free-space optical communication through atmospheric turbulence channels,” IEEE Trans. Commun.50, 1293–1300 (2002). [CrossRef]

IEEE Trans. Wireless Comm.

S. M. Navidpour, M. Uysal, and M. Kavehrad, “BER performance of free-space optical transmission with spatial diversity,” IEEE Trans. Wireless Comm.6, 2813–2819 (2007). [CrossRef]
T. A. Tsiftsis, H.G. Sandalidis, G. K. Karagiannidis, and M. Uysal, “Optical wireless links with spatial diversity over strong atmospheric turbulence channels,” IEEE Trans. Wireless Comm.8, 951–957 (2009). [CrossRef]

IEICE Trans. Fundamentals.

A. T. Pham, T. A. Luu, and N. T. Dang, “Performance bound for Turbo-coded 2-D FSO/CDMA systems over atmospheric turbulence channel,” IEICE Trans. Fundamentals.E93-A, 1745–1337 (2010). [CrossRef]

J. Lightwave Technol.

M. Jazayerifar and J. A. Salehi, “Atmospheric optical CDMA communication systems via optical orthogonal godes,” J. Lightwave Technol.54, 1614–1623 (2006).
T. Miyazawa and I. Sasase, “BER performance analysis of spectral phase-encoded optical atmospheric PPM-CDMA communication systems,” J. Lightwave Technol.25, 2992–3000 (2007). [CrossRef]
T. Ohtsuki, “Performance analysis of atmospheric optical PPM CDMA systems,” J. Lightwave Technol.21, 406–411 (2003). [CrossRef]

J. Opt. Netw.

Q. Liu, C. Qiao, G. Mitchell, and S. Stanton, “Optical wireless communication networks for first- and last-mile broadband access [Invited],” J. Opt. Netw.4, 807–828 (2005). [CrossRef]

Proceedings of SPIE Free-Space Laser Commun. Laser Imaging

C. C. Davis and I. Smolyaninov, “The effect of atmospheric turbulence on bit-error-rate in an on-off keyed optical wireless system,” in Proceedings of SPIE Free-Space Laser Commun. Laser Imaging, (1997), pp. 126–137.

Other

K. Ohba, T. Hirano, T. Miyazawa, and I. Sasase, “A symbol decision scheme to mitigate effects of scintillations and MAIs in optical atmospheric PPM-CDMA systems,” in Proceedings of IEEE GLOBECOM, (St. Louis, 2005), pp. 1999–2003.
H. Hemmati, Deep Space Optical Communications (John Wiley and Sons, 2006). [CrossRef]
I. Djordjevic, W. Ryan, and B. Vasic, Coding for Optical Channels (Springer, 2010). [CrossRef]
G. Agrawal, Nonlinear Fiber Optics (Academic Press, 2006).
G. C. Yang and W. C. Kwong, Prime Code with Application to CDMA Optical and Wireless Networks (Artech House, 2002).

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