Title :
Improvement of the Transmission Bandwidth for Indoor Optical Wireless Communication Systems Using a Diffused Gaussian Beam
Author :
Wu, Dehao ; Ghassemlooy, Zabih ; Minh, Hoa Le ; Rajbhandari, Sujan ; Boucouvalas, Anthony C.
Author_Institution :
Optical Communications Research Group, School of CEIS, Northumbria University, Newcastle upon Tyne, NE1 8ST, U.K
fDate :
8/1/2012 12:00:00 AM
Abstract :
The multipath dispersion in a non-directed line-of-sight (LOS) indoor optical wireless communications (OWC) channel limits the transmission bandwidth. In this study, we improve the transmission bandwidth by employing a TEM_{00} mode laser beam and an alignment-free light shaping diffuser (LSD). We derive a new expression for the radiation field distribution of the diffused Gaussian beam (DGB) and its multipath impulse response. The transmission bandwidth is determined based on the numerical simulation of the root mean square (RMS) delay spread in a room. Results show that indoor OWC systems employing DGB offers significantly higher transmission bandwidth compared to the Lambertian beam (LB) for a wide divergence angle.
Keywords :
Bandwidth; Delay; Laser beams; Optical beams; Optical receivers; Optical transmitters; Wireless communication; Optical wireless communications; diffused Gaussian beam; multipath dispersion and RMS delay spread;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2012.060812.120803
