Title :
On free-space optic communication with Alamouti-type coding and direct detection
Author :
Tabach, Mamdouh El ; Tortelier, Patrick ; Pyndiah, Ramesh ; Bouchet, Olivier
Author_Institution :
France Telecom, Cesson-Sevigne
Abstract :
By Transmitting unipolar positive signals, a novel association of Alamouti space-time coding to free-space optic (FSO) communication is presented. We examine intensity modulation (IM) based on electrical fast Fourier transform (FFT) design with Hermitian symmetry. The proposed technique aims at limiting signal fading due to scintillation. It maximizes the spatial diversity, increases the reliability, and makes it possible to use digital complex QAM modulations while preserving direct detection (DD).
Keywords :
fast Fourier transforms; intensity modulation; optical communication; quadrature amplitude modulation; space-time codes; Alamouti-type coding; Hermitian symmetry; digital complex QAM modulations; direct detection; electrical fast Fourier transform; free-space optic communication; intensity modulation; scintillation; space-time coding; Fading; Intensity modulation; Optical modulation; Optical propagation; Optical receivers; Optical scattering; Optical transmitters; Quadrature amplitude modulation; Signal to noise ratio; Solid scintillation detectors; Alamouti; FSO; IM/DD; QAM; optical wireless; spatial diversity;
Conference_Titel :
Wireless Pervasive Computing, 2008. ISWPC 2008. 3rd International Symposium on
Conference_Location :
Santorini
Print_ISBN :
978-1-4244-1652-3
Electronic_ISBN :
978-1-4244-1653-0
DOI :
10.1109/ISWPC.2008.4556308
