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

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Abstract

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.

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Authors and Affiliations

  1. ECE, IKGPTU, Jalandhar, 144601, India

    Ritu Gupta

  2. ECE, RIET, Abohar, Punjab, 152116, India

    Tara Singh Kamal

  3. ECE, UIET, PU, Chandigarh, 160016, India

    Preeti Singh

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  1. Ritu Gupta
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  2. Tara Singh Kamal
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  3. Preeti Singh
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Correspondence to Ritu Gupta.

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Gupta, R., Kamal, T.S. & Singh, P. Concatenated LDPC-TCM Codes for Better Performance of OFDM-FSO System Using Gamma–Gamma Fading Model. Wireless Pers Commun 106, 2247–2260 (2019). https://doi.org/10.1007/s11277-018-5939-3

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