Abstract

<p><a href="http://www.osa-jon.org/features/OWC_2005.html">Feature Issue on Optical Wireless Communications (OWC)</a></p> 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

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54th Vehicular Technology Conf. 2001 (1)

D. P. Palomar, J. R. Fonollosa, and M. A. Lagunas, "Capacity results of spatially correlated frequency-selective MIMO channels in UMTS," in 54th IEEE Vehicular Technology Conference, 2001. VTC 2001 (IEEE, 2001), Vol. 2, 553-557.

GLOBECOM 2003 (1)

Jing Li and M. Uysal, "Achievable information rate for outdoor free space optical communication with intensity modulation and direct detection," in Global Telecommunications Conference 2003. GLOBECOM '03 (IEEE, 2003), Vol. 5, 2654-2658.

ICC 2004 (1)

M. Uysal and J. Li, "Error rate performance of coded free-space optical links over gamma-gamma turbulence channels," in Proceedings of IEEE International Conference on Communication ICC'04 (IEEE, 2004), Vol. 6, pp. 3331-3335.

IEEE Commun. Lett. (2)

I. B. Djordjevic and B. Vasic, "MacNeish-Mann theorem based iteratively decodable codes for optical communication systems," IEEE Commun. Lett. 8, 538-540 (2004).

M. Uysal, S. Mohammad Navidpour, and J. Li, "Error rate performance of coded free-space optical links over strong turbulence channels," IEEE Commun. Lett. 8, 635-637 (2004).

IEEE Trans. Commun. (1)

X. Zhu and J. M. Kahn, "Free-space optical communication through atmospheric turbulence channels," IEEE Trans. Commun. 50, 1293-1300 (2002).

IEEE Trans. Inf. Theory (2)

B. Vasic and O. Milenkovic "Combinatorial construction of low-density parity check codes," IEEE Trans. Inf. Theory 50, 1156-1176 (2004).

Y. Kou, S. Lin, and M. P. C. Fossorier, "Low-density parity-check codes based on finite geometries: a rediscovery and new results," IEEE Trans. Inf. Theory 47, 2711-2736 (2001).

IEEE Wireless Commun. (1)

A. C. Boucouvalas, "Guest editorial--Optical wireless communications," IEEE Wireless Commun. 10, 6-7 (2003).

J. Opt. Soc. Am. A (7)

J. Sel. Top. Quant. Electron. (1)

O. Milenkovic, I. B. Djordjevic, and B. Vasic, "Block-circulant low-density parity-check codes for optical communication systems," J. Sel. Top. Quant. Electron. 10, 294-299 (2004).

Opt. Eng. (1)

M. A. Al-Habash, L. C. Andrews, and R. L. Phillips, "Mathematical model for the irradiance probability density function of a laser beam propagating through turbulent media," Opt. Eng. 40, 1554-1562 (2001).

Wiley Encyclopedia in Telecommunications (1)

W. E. Ryan, "Concatenated convolutional codes and iterative decoding," in Wiley Encyclopedia in Telecommunications, J. G. Proakis, ed. (Wiley, 2003).

Wireless Communications and Networking (1)

M. Fozunbal, S. W. McLauhlin, R. W. Schafer, "On performance limits of MIMO-OFDM systems over block-fading channels," in Wireless Communications and Networking Conference, 2004. WCNC (IEEE, 2004), Vol. 2, 976-980.

Other (9)

A. Papoulis, Probability, Random Variables, and Stochastic Processes (WCB∕McGraw Hill, 1991).

C. P. Robert and G. Casella, Monte Carlo Statistical Methods (Springer-Verlag, 2004).

L. C. Andrews, R. L. Phillips, and C. Y. Hopen, Laser Beam Scintillation with Applications (SPIE, 2001).

S. Karp, R. Gagliardi, S. E. Moran, and L. B. Stotts, Optical Channels (Plenum, 1988).

L. C. Andrews and R. L. Phillips, Laser Beam Propagation through Random Media (SPIE, 1998).

T. M. Cover and J. A. Thomas, Elements of Information Theory (Wiley-Interscience, 1991).

M. Mansour, "Implementation of LDPC Decoders," presented at the IEEE Comm. Theory Workshop, Park City, Utah, 13-15 June 2005.

A. Ishimaru, Wave Propagation and Scattering in Random Media (Academic, New York, 1978), Vols. 1-2.

S. Lin and D. J. Costello, Error Control Coding (Prentice Hall, 2004).

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