Paper Info
Title
Reducing atmospheric turbulence effects in FSO/CDMA systems by using multi-wavelength PPM signaling
Abstract
In this paper, we present a comprehensive study of the effects of atmospheric turbulence, including intensity fluctuation and pulse broadening, on the performance of FSO/CDMA systems. A realistic model of Gaussian pulse propagation is used for analyzing the bit error rate (BER). The numerical results show that pulse position modulation (PPM) with high modulation level should not be used for FSO/CDMA systems as it requires to send high chip rate (i.e., short pulse), which is significantly affected by pulse broadening effect. To overcome the limitation of PPM, we propose to use multi-wavelength PPM (MWPPM), which achieves high modulation level by combining PPM and wavelength shift keying. By using MWPPM, the effects of both intensity fluctuation and pulse broadening are mitigated thus the BER is reduced. In addition, we found that the performance of FSO/CDMA systems using MWPPM can be further improved and lower BER can be achieved by using avalanche photodiode with the gain around 80 to 100.
Year
DOI
Venue
2012
10.1109/APCC.2012.6388158
APCC
Keywords
Field
DocType
avalanche photodiodes,code division multiple access,error statistics,optical links,optical modulation,pulse position modulation,ber,fso-cdma systems,mwppm,atmospheric turbulence effects reduction,avalanche photodiode,bit error rate,code-division multiple-access systems,free-space optical communication,intensity fluctuation,multiwavelength ppm signaling,pulse broadening effect,pulse propagation,wavelength shift keying
Avalanche photodiode,Telecommunications,Pulse-position modulation,Computer science,Keying,Optics,Chip,Pulse (signal processing),Real-time computing,Modulation,Code division multiple access,Bit error rate
Conference
ISSN
ISBN
Citations 
2163-0771
978-1-4673-4727-3
0
PageRank 
References 
Authors
0.34
8
3
Name
Order
Citations
PageRank
Ngoc T. Dang186.43
Hien T. T. Pham2174.65
Pham, A.T.300.34