Corrections to and comments on "optimization of urban optical wireless communication systems"
IEEE Transactions on Wireless Communications
Channel capacity and non-uniform signalling for free-space optical intensity channels
IEEE Journal on Selected Areas in Communications - Special issue on optical wireless communications
IEEE Transactions on Communications
Performance of PPM on terrestrial FSO links with turbulence and pointing errors
IEEE Communications Letters
Availability study of FSO systems in Europe
ECS'10/ECCTD'10/ECCOM'10/ECCS'10 Proceedings of the European conference of systems, and European conference of circuits technology and devices, and European conference of communications, and European conference on Computer science
Statistical analysis of fade events on FSO systems
ACACOS'12 Proceedings of the 11th WSEAS international conference on Applied Computer and Applied Computational Science
Topology and routing optimization for congestion minimization in optical wireless networks
Optical Switching and Networking
| Hi-index | 0.01 |
Urban optical wireless communication systems are considered a "last mile" technology. An optical wireless communication system uses the atmosphere as a propagation medium. In order to provide line-of-sight (LOS), the transceivers are placed on high-rise buildings. However, dynamic wind loads, thermal expansion, and weak earthquakes cause buildings to sway. These sways require the designer to increase the transmitter beam divergence angle so as to maintain LOS between the transmitter and the receiver. It is clear that an overly wide divergence angle increases the required laser power, and, as a result, terminal cost and complexity increase. On the other hand, an overly narrow beam divergence angle may result in cutoff in communication when there is building sway. In this paper, we derive a mathematical model to minimize transmitter power and optimize transmitter gain (divergence angle) as a function of the building-sway statistics, the communication system parameters, and the required bit-error probability (BEP). Reduction in laser power could improve overall system performances and cost. For example, for BEP of 10-9, we can attain at least a 4-dB reduction of the required transmitter power in comparison to a system with both half and twice the optimum beam divergence angle.