• Infrared and Laser Engineering
  • Vol. 45, Issue 7, 722003 (2016)
Wang Yi1、2, Yang Shuai2, Ma Jing1, and Shan Liang2
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    DOI: 10.3788/irla201645.0722003 Cite this Article
    Wang Yi, Yang Shuai, Ma Jing, Shan Liang. Performance analysis of coherent OFDM system in free space optical communication[J]. Infrared and Laser Engineering, 2016, 45(7): 722003 Copy Citation Text show less

    Abstract

    Combining the advantages of OFDM technology with the coherent detection, the bit error rate(BER) performance of coherent OFDM FSO system was studied, and the influence of OFDM mapping mode and mapping order on the symbol error of the system was taken into account. In Gamma-Gamma atmospheric turbulence channel model, the bit error performance of three cases of weak, moderate and strong turbulence were taken into consideration separately from the perspective of the average signal-to-noise ratio and the required average received optical power. On this basis, the closed form expression of the symbol error rate was deduced. Simulation results show that the coherent detection OFDM FSO system can better overcome the effects of atmospheric turbulence, in weak and moderate turbulence, the system BER performance with QAM mapping mode is obviously better than that of PSK mapping mode, however, under the strong turbulence the advantage is not very obvious. In addition, with the increase of mapping order, system symbol error rate increases, so in practice it can improve the system BER performance by reducing the number of mapping order.
    Wang Yi, Yang Shuai, Ma Jing, Shan Liang. Performance analysis of coherent OFDM system in free space optical communication[J]. Infrared and Laser Engineering, 2016, 45(7): 722003
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