KEYWORDS: Turbulence, Signal to noise ratio, Free space optics, Receivers, Telecommunications, Monte Carlo methods, Systems modeling, Statistical analysis, Free space optical communications, Satellites
In this letter, we study the average bit-error-rate (BER) performance of coherent free space optical communication systems with selection combining (SC) receive diversity over correlated Gamma-Gamma channels under non-Kolmogorov turbulence. Novel and computationally efficient analytical expressions over correlated and independent Gamma-Gamma channels of the average BER are derived. Then using these analytical expressions, we analyze the effects of the spectral power law and the channel correlation coefficient on the average BER performance. The correctness of the analytical results is verified by Monte Carlo simulation. This work will help with the further investigation of the fading correlation in the spatial diversity systems.
KEYWORDS: Turbulence, Free space optics, Telecommunications, Receivers, Signal to noise ratio, Systems modeling, Monte Carlo methods, Modulation, Optical engineering, Lutetium
The average bit error rate (BER) performance of direct single-input multiple-output (SIMO) free-space optical link over correlated non-Kolmogorov turbulence fading channels is studied. In particular, the new closed-form expressions of BER performance of maximal ratio combining (MRC) and equal gain combining (EGC) receive-diversity systems are derived by α-μ distribution approximation method. The influence of both spectral power law and the channel correlation on the BER performance of MRC and EGC diversity systems is systematically investigated and compared. Monte Carlo simulation results are also presented to illustrate the validity of the proposed approach. We will help to investigate the fading correlation in spatial diversity systems and provide useful information for the design of the diversity system.
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