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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editor: Richard A. Linke
  • Vol. 4, Iss. 9 — Sep. 1, 2005
  • pp: 586–601

Shannon capacities and error-correction codes for optical atmospheric turbulent channels

Jaime Anguita, Ivan Djordjevic, Mark Neifeld, and Bane Vasic  »View Author Affiliations


Journal of Optical Networking, Vol. 4, Issue 9, pp. 586-601 (2005)
http://dx.doi.org/10.1364/JON.4.000586


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Abstract

Feature Issue on Optical Wireless Communications (OWC)

The propagation of an on-off keying modulated optical signal through an optical atmospheric turbulent channel is considered. The intensity fluctuations of the signal observed at the receiver are modeled using a gamma-gamma distribution. The capacity of this channel is determined for a wide range of turbulence conditions. For a zero inner scale, the capacity decreases monotonically as the turbulence strengthens. For non-zero inner scale, the capacity is not monotonic with turbulence strength. Two error-correction schemes, based on low-density parity-check (LDPC) codes, are investigated as a means to improve the bit-error rate (BER) performance of the system. Very large coding gains--ranging from 5.5 to 14 dB, depending on the turbulence conditions--are obtained by these LDPC codes compared with Reed-Solomon error-correction codes of similar rates and lengths.

© 2005 Optical Society of America

OCIS Codes
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(060.4510) Fiber optics and optical communications : Optical communications

ToC Category:
Optical Wireless Communications

History
Original Manuscript: April 18, 2005
Revised Manuscript: April 15, 2005
Published: August 24, 2005

Virtual Issues
Optical Wireless Communications (2005) Journal of Optical Networking

Citation
Jaime Anguita, Ivan Djordjevic, Mark Neifeld, and Bane Vasic, "Shannon capacities and error-correction codes for optical atmospheric turbulent channels," J. Opt. Netw. 4, 586-601 (2005)
http://www.opticsinfobase.org/jocn/abstract.cfm?URI=jon-4-9-586

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