Multilevel Modulation and Channel Codes for Terrestrial FSO links

The basic aim of this work is to enhance the performance of the existing terrestrial FSO links by introducing a well-suited modulation and channel coding scheme. Selecting an appropriate modulation and coding scheme for the FSO systems requires thorough knowledge of the behavior of the FSO systems under different conditions and the objectives that need to be achieved out of the modulation mechanism. Since modulation for the FSO systems are primarily targeted at achieving higher average optical power, so that the penetration of the light waves through the adverse weather conditions can be increased. Thus, the power efficiency of the scheme remains the deciding criteria in the selection of the modulation format. The choice of the modulation and coding format has to be based on measurements and simulation of the performance of FSO systems under nonfavourable atmospheric conditions. An effort is also being made to simulate the atmospheric free space optical channel to get more insight into the problem

[1]  J. Pierce,et al.  Optical Channels: Practical Limits with Photon Counting , 1978, IEEE Trans. Commun..

[2]  Joseph M. Kahn,et al.  Performance evaluation of L-pulse-position modulation on non-directed indoor infrared channels , 1994, Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications.

[3]  D. A. Johns,et al.  A multilevel modulation scheme for high-speed wireless infrared communications , 1999, ISCAS'99. Proceedings of the 1999 IEEE International Symposium on Circuits and Systems VLSI (Cat. No.99CH36349).

[4]  Joseph M. Kahn,et al.  Coding and equalization for PPM on wireless infrared channels , 1998, IEEE GLOBECOM 1998 (Cat. NO. 98CH36250).

[5]  John R. Pierce,et al.  The capacity of the photon counting channel , 1981, IEEE Trans. Inf. Theory.

[6]  Robert J. McEliece,et al.  Practical codes for photon communication , 1981, IEEE Trans. Inf. Theory.

[7]  John R. Barry,et al.  Modulation analysis for wireless infrared communications , 1995, Proceedings IEEE International Conference on Communications ICC '95.

[8]  E. Leitgeb,et al.  Reliable terrestrial FSO systems for higher bit rates , 2005, Proceedings of the 8th International Conference on Telecommunications, 2005. ConTEL 2005..

[9]  Joseph M. Kahn,et al.  Shaping and nonequiprobable signaling for intensity-modulated signals , 1999, IEEE Trans. Inf. Theory.

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

[11]  D.C.M. Lee,et al.  Trellis-coded pulse-position modulation for indoor wireless infrared communications , 1996, Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications.

[12]  Jon Hamkins.  Performance of Binary Turbo-Coded 256-ary Pulse-Position Modulation , 1999 .

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

[14]  Gorazd Kandus,et al.  Hybrid Wireless Networks combining WLAN, FSO and Satellite Technology for Disaster Recovery , 2005 .

[15]  Hervé Sizun,et al.  Fog attenuation prediction for optical and infrared waves , 2004 .

[16]  F. de Fornel,et al.  Measurement of Light attenuation in dense fog conditions for FSO applications , 2005, SPIE Optics + Photonics.

[17]  J. Gordon,et al.  Quantum Effects in Communications Systems , 1962, Proceedings of the IRE.

[18]  E. Leitgeb,et al.  Channel modeling for terrestrial free space optical links , 2005, Proceedings of 2005 7th International Conference Transparent Optical Networks, 2005..