Concatenated LDPC-TCM Codes for Better Performance of OFDM-FSO System Using Gamma–Gamma Fading Model

Various channel coding techniques have been used for free space optical (FSO) links to alleviate the effects of fading, induced due to turbulence. In this paper, the error rate performance is scrutinized for orthogonal frequency division multiplexing based FSO system with 16-QAM modulation, and the...

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Bibliographic Details
Published in:Wireless personal communications 2019-06, Vol.106 (4), p.2247-2260
Main Authors: Gupta, Ritu, Kamal, Tara Singh, Singh, Preeti
Format: Article
Language:English
Subjects:
Atmospheric turbulence
Codes
Coding
Communications Engineering
Computer Communication Networks
Engineering
Fading
Irradiance
Modulation
Networks
Orthogonal Frequency Division Multiplexing
Probability distribution functions
Signal,Image and Speech Processing
Trellis coding
Variation
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Summary:Various channel coding techniques have been used for free space optical (FSO) links to alleviate the effects of fading, induced due to turbulence. In this paper, the error rate performance is scrutinized for orthogonal frequency division multiplexing based FSO system with 16-QAM modulation, and the effect of several atmospheric turbulence conditions has been analyzed. Due to atmospheric turbulence, the arbitrary fluctuations of optical irradiance are modelled by widely used Gamma-gamma distribution model. The various channel coding schemes has been analyzed and a new hybrid coding scheme (the outer low-density parity check codes efficiently integrated with interleaved trellis code modulation codes) is developed, which has shown superior performance under all turbulence conditions and outperform the other individual coding schemes. The proposed hybrid scheme is analyzed for single antenna fading channels to achieve better error rate performance.
ISSN:0929-6212
1572-834X
DOI:10.1007/s11277-018-5939-3