Rate-adaptive FSO links over atmospheric turbulence channels by jointly using repetition coding and silence periods.

In this paper, a new and simple rate-adaptive transmission scheme for free-space optical (FSO) communication systems with intensity modulation and direct detection (IM/DD) over atmospheric turbulence channels is analyzed. This scheme is based on the joint use of repetition coding and variable silence periods, exploiting the potential time-diversity order (TDO) available in the turbulent channel as well as allowing the increase of the peak-to-average optical power ratio (PAOPR). Here, repetition coding is firstly used in order to accommodate the transmission rate to the channel conditions until the whole time diversity order available in the turbulent channel by interleaving is exploited. Then, once no more diversity gain is available, the rate reduction can be increased by using variable silence periods in order to increase the PAOPR. Novel closed-form expressions for the average bit-error rate (BER) as well as their corresponding asymptotic expressions are presented when the irradiance of the transmitted optical beam follows negative exponential and gamma-gamma distributions, covering a wide range of atmospheric turbulence conditions. Obtained results show a diversity order as in the corresponding rate-adaptive transmission scheme only based on repetition codes but providing a relevant improvement in coding gain. Simulation results are further demonstrated to confirm the analytical results. Here, not only rectangular pulses are considered but also OOK formats with any pulse shape, corroborating the advantage of using pulses with high PAOPR, such as gaussian or squared hyperbolic secant pulses. We also determine the achievable information rate for the rate-adaptive transmission schemes here analyzed.

[1]  Wansu Lim,et al.  BER performance analysis of radio over free-space optical systems considering laser phase noise under Gamma-Gamma turbulence channels. , 2009, Optics express.

[2]  Antonio Garc.  Error Rate Performance for STBC in Free-Space Optical Communications through Strong Atmospheric Turbulence , 2007 .

[3]  Ivan B. Djordjevic.  LDPC-coded MIMO optical communication over the atmospheric turbulence channel using Q-ary pulse-position modulation , 2007 .

[4]  Robert Schober,et al.  On space-time coding for free-space optical systems , 2010, IEEE Transactions on Communications.

[5]  Murat Uysal,et al.  Error rate performance analysis of coded free-space optical links over gamma-gamma atmospheric turbulence channels , 2006, IEEE Transactions on Wireless Communications.

[6]  Frank R. Kschischang,et al.  Optical intensity-modulated direct detection channels: signal space and lattice codes , 2003, IEEE Trans. Inf. Theory.

[7]  Jing Li,et al.  Achievable information rate for outdoor free space optical communication with intensity modulation and direct detection , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[8]  Mohsen Kavehrad,et al.  BER Performance of Free-Space Optical Transmission with Spatial Diversity , 2007, IEEE Transactions on Wireless Communications.

[9]  Maïté Brandt-Pearce,et al.  Free-space optical MIMO transmission with Q-ary PPM , 2005, IEEE Transactions on Communications.

[10]  Silvano Donati,et al.  Distance and Displacement Measurements by Laser Technique , 2001 .

[11]  Antonio García-Zambrana,et al.  Space-time trellis coding with transmit laser selection for FSO links over strong atmospheric turbulence channels. , 2010, Optics express.

[12]  A. Garcia-Zambrana,et al.  Selection Transmit Diversity for FSO Links Over Strong Atmospheric Turbulence Channels , 2009, IEEE Photonics Technology Letters.

[13]  Joseph M. Kahn,et al.  Wireless Infrared Communications , 1994 .

[14]  George S. Tombras,et al.  Average Capacity of Optical Wireless Communication Systems Over Atmospheric Turbulence Channels , 2009 .

[15]  A. A. Ali,et al.  On the use of repetition coding with binary digital modulations on mobile channels , 1987 .

[16]  Victor Adamchik,et al.  The algorithm for calculating integrals of hypergeometric type functions and its realization in REDUCE system , 1990, ISSAC '90.

[17]  Joseph M. Kahn,et al.  Free-space optical communication through atmospheric turbulence channels , 2002, IEEE Trans. Commun..

[18]  I. Djordjevic.  Adaptive Modulation and Coding for Free-Space Optical Channels , 2010, IEEE/OSA Journal of Optical Communications and Networking.

[19]  I. S. Gradshteyn,et al.  Table of Integrals, Series, and Products , 1976 .

[20]  George K. Karagiannidis,et al.  Optical Wireless Communications with Adaptive Subcarrier PSK Intensity Modulation , 2010, 2010 IEEE Global Telecommunications Conference GLOBECOM 2010.

[21]  Antonio García-Zambrana,et al.  Efficient lognormal channel model for turbulent FSO communications , 2007 .

[22]  Ivan B Djordjevic,et al.  On the communication over strong atmospheric turbulence channels by adaptive modulation and coding. , 2009, Optics express.

[23]  William K. McIntire,et al.  Hybrid Optical RF Airborne Communications , 2009, Proceedings of the IEEE.

[24]  Salah Bourennane,et al.  Channel coding and time-diversity for optical wireless links. , 2009, Optics express.

[25]  Ivan B. Djordjevic,et al.  Shannon capacities and error-correction codes for optical atmospheric turbulent channels , 2005 .

[26]  A. Ishimaru,et al.  Time-of-Arrival Fluctuations of a Space-Time Gaussian Pulse in Weak Optical Turbulence: an Analytic Solution. , 1998, Applied optics.

[27]  George K. Karagiannidis,et al.  On the Distribution of the Sum of Gamma-Gamma Variates and Application in MIMO Optical Wireless Systems , 2009, GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference.

[28]  Larry C. Andrews,et al.  Probability Density Function , 2012 .

[29]  Antonio García-Zambrana,et al.  Average capacity of FSO links with transmit laser selection using non-uniform OOK signaling over exponential atmospheric turbulence channels. , 2010, Optics express.

[30]  Marvin K. Simon,et al.  Alamouti-type space-time coding for free-space optical communication with direct detection , 2005, IEEE Transactions on Wireless Communications.

[31]  N. L. Johnson,et al.  Continuous Univariate Distributions. , 1995 .

[32]  Antonio Puerta-Notario,et al.  Novel approach for increasing the peak-to-average optical power ratio in rate-adaptive optical wireless communication systems , 2003 .

[33]  Chadi Abou-Rjeily,et al.  Orthogonal space-time block codes for binary pulse position modulation , 2009, IEEE Transactions on Communications.

[34]  George K. Karagiannidis,et al.  Optical wireless links with spatial diversity over strong atmospheric turbulence channels , 2009, IEEE Transactions on Wireless Communications.

[35]  R.V. Penty,et al.  Link Reliability Improvement for Optical Wireless Communication Systems With Temporal-Domain Diversity Reception , 2008, IEEE Photonics Technology Letters.

[36]  A. Puerta-Notario,et al.  RZ-Gaussian pulses reduce the receiver complexity in wireless infrared links at high bit rates , 1999 .

[37]  R. Fante.  Electromagnetic beam propagation in turbulent media , 1975, Proceedings of the IEEE.

[38]  Antonio García-Zambrana,et al.  Large change rate-adaptive indoor wireless infrared links using variable silence periods , 2001 .

[39]  Antonio Jurado-Navas,et al.  An efficient rate-adaptive transmission technique using shortened pulses for atmospheric optical communications. , 2010, Optics express.

[40]  Antonio García-Zambrana,et al.  On the Capacity of FSO Links over Gamma-Gamma Atmospheric Turbulence Channels Using OOK Signaling , 2010, EURASIP J. Wirel. Commun. Netw..