Title :
Design and evaluation of an IDMA cooperative relay free-space optical system
Author :
Fan, Jingyuan ; Zhou, Xiaolin ; Liu, Jun
Author_Institution :
Dept. of Commun. Sci. & Eng., Fudan Univ., Shanghai, China
Abstract :
In this paper, we illustrate our attempt in an effective method of free space optical (FSO) communications. Firstly, a pulse-position modulated (PPM) optical interleave-division multiple-access (OIDMA) system is designed. Secondly, to alleviate the degrading effects of atmospheric turbulence, cooperative relay technique is adopted by OIDMA for achieving spatial diversity and robust transmission performance. Thirdly, to study the convergence behavior of the proposed relay-assisted optical PPM-OIDMA system, extrinsic information transfer (EXIT) charts are analyzed. By deriving the trajectories of the exchanged extrinsic information from EXIT charts, the time of iterations required for convergence can be easily predicted. The effects of scintillation, thermal noise, background noise and multi-user interference have been taken into consideration.
Keywords :
cooperative communication; multi-access systems; optical links; IDMA cooperative relay free-space optical system; atmospheric turbulence; background noise; cooperative relay technique; extrinsic information transfer; free space optical communications; multi-user interference; pulse-position modulated optical interleave-division multiple-access system; relay-assisted optical PPM-OIDMA system; spatial diversity; thermal noise; Bit error rate; Convergence; High speed optical techniques; Multiuser detection; Optical amplifiers; Optical receivers; Relays; EXIT analysis; OIDMA; cooperative relay; free-space optical;
Conference_Titel :
Space Optical Systems and Applications (ICSOS), 2011 International Conference on
Conference_Location :
Santa Monica, CA
Print_ISBN :
978-1-4244-9686-0
DOI :
10.1109/ICSOS.2011.5783697
