Title :
Free-space optical communication employing polarization shift keying coherent modulation in atmospheric turbulence channel
Author :
Tang, X. ; Ghassemlooy, Z. ; Rajbhandari, S. ; Popoola, W.O. ; Lee, C.G. ; Leitgeb, E. ; Ahmadi, V.
Author_Institution :
Northumbria Univ., Newcastle upon Tyne, UK
Abstract :
A binary polarization shift keying (2PolSK) scheme with a coherent heterodyne receiver for a free space optical (FSO) link through atmospheric turbulence channel is proposed and discussed. The maximum ratio combining (MRC) and equal gain combining (EGC) spatial diversity techniques have been applied to mitigate the turbulence induced irradiance fluctuation with bit error rate (BER) expressions derived for each. The communication channel is modelled as a gamma-gamma channel. The analysis of the 2PolSK characteristics is based on the error performance in turbulence regimes from weak to strong. Simulation results show that using the proposed system with MRC offers the best performance but at the cost of high system complexity.
Keywords :
atmospheric turbulence; diversity reception; error statistics; heterodyne detection; modulation; optical links; optical receivers; polarisation; wireless channels; MRC; atmospheric turbulence channel; binary polarization shift keying modulation; bit error rate; coherent heterodyne receiver; equal gain combining; free-space optical communication; gamma-gamma channel; irradiance fluctuation; maximum ratio combining; spatial diversity techniques; turbulence regimes; Bit error rate; Diversity reception; Optical mixing; Optical polarization; Optical receivers; Signal to noise ratio;
Conference_Titel :
Communication Systems Networks and Digital Signal Processing (CSNDSP), 2010 7th International Symposium on
Conference_Location :
Newcastle upon Tyne
Print_ISBN :
978-1-4244-8858-2
Electronic_ISBN :
978-1-86135-369-6
