Physical and Upper Layer Solutions for Next Generation Optical Wireless
Communications
Prof. Dr.
Murat Uysal
DEPARTMENT
Electrical & Electronics
Engineering
CONTACT
[email protected]
FUNDING SCHEME
TÜBİTAK 2515 - COST
START DATE
01.11.2011
DURATION
36 months
2011 National Grants
Optical wireless transmission (OWC) refers to optical transmission in unguided environments through the deployment of
optical carriers at infrared, ultraviolet, and visible wavelengths. With attractive features such as high bandwidth capacity,
low cost, and unregulated spectrum, OWC systems can be considered as a complementary and/or alternative technology
to fiber optic and radio frequency (RF) wireless systems. Despite the large number of potential application areas, the wide
scale deployment of OWC systems has been hampered by their rather disappointing performance particularly in long ranges.
The major degrading factors that significantly affect the link reliability and coverage area of terrestrial OWC systems are
atmospheric turbulence induced fading and sensitivity to meteorological conditions. The main objective of this project is to
present advanced physical layer and upper layer solutions to improve the link reliability and the link range in the presence
of such adverse conditions. Towards this main objective, the project consists of five workpackages. The first work package
involves the application of relay-assisted cooperative diversity principles to OWC systems. In this work package, we will
design low-complexity OWC systems that will provide a high link reliability in long ranges and analyze their performance in
various turbulence environments. In the second work package, considering the quasi-static nature of atmospheric turbulence
channel and therefore the possibility of reliable feedback information, we will develop adaptive transmission algorithms
in which system parameters are varied according to the channel conditions. In the third work package, we will design
hybrid RF/OWC systems to exploit media diversity and therefore ensure high link reliability regardless of meteorological
conditions. In the fourth work package, we will investigate a data link layer technique known as automatic repeat request
(ARQ) in the context of OWC systems. In the fifth work package, we will work on the analysis and design of scheduling
methods for a multi-user OWC network. The proposed algorithms, techniques, methods, and systems will be investigated
in detail over the optical wireless channels under consideration and their superiority will be demonstrated with respect to
the existing ones in the literature.
Electrical & Electronics Engineering
ABSTRACT
OZU BUDGET
251,580.00 TL
23