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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 17 — Aug. 26, 2013
  • pp: 20346–20362

Ergodic capacity comparison of optical wireless communications using adaptive transmissions

Md. Zoheb Hassan, Md. Jahangir Hossain, and Julian Cheng  »View Author Affiliations

Optics Express, Vol. 21, Issue 17, pp. 20346-20362 (2013)

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Ergodic capacity is investigated for the optical wireless communications employing subcarrier intensity modulation with direct detection, and coherent systems with and without polarization multiplexing over the Gamma-Gamma turbulence channels. We consider three different adaptive transmission schemes: (i) variable-power, variable-rate adaptive transmission, (ii) complete channel inversion with fixed rate, and (iii) truncated channel inversion with fixed rate. For the considered systems, highly accurate series expressions for ergodic capacity are derived using a series expansion of the modified Bessel function and the Mellin transformation of the Gamma-Gamma random variable. Our asymptotic analysis reveals that the high SNR ergodic capacities of coherent, subcarrier intensity modulated, and polarization multiplexing systems gain 0.33 bits/s/Hz, 0.66 bits/s/Hz, and 0.66 bits/s/Hz respectively with 1 dB increase of average transmitted optical power. Numerical results indicate that a polarization control error less than 10° has little influence on the capacity performance of polarization multiplexing systems.

© 2013 OSA

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

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: June 14, 2013
Revised Manuscript: July 26, 2013
Manuscript Accepted: August 2, 2013
Published: August 22, 2013

Md. Zoheb Hassan, Md. Jahangir Hossain, and Julian Cheng, "Ergodic capacity comparison of optical wireless communications using adaptive transmissions," Opt. Express 21, 20346-20362 (2013)

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