Performance Analysis and Optimization Based on Adaptive Modulation and Chaotic Interleaving for Helicopter-Satellite Communications |
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Authors: | Emad A Elaty Mohammed Abd-Elnaby Saied M Abd El-atty Sami A El-Dolil Moawad I Dessouky Fathi E Abd El-Samie |
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Affiliation: | 1.Department of Electronics and Electrical Communications, Higher Institute of Engineering,El Shorouk Academy,El Shorouk City,Egypt;2.Department of Electronics and Electrical Communications, Faculty of Electronic Engineering,Menoufia University,Menouf,Egypt |
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Abstract: | Overcoming periodic blockage of the received signal and the carrier frequency fluctuations caused by rotor blades and Doppler shift, respectively, are considered the most challenging issues in helicopter-satellite communication systems. In this study, we propose an automatic frequency control method based on an adaptive modulation scheme. We employ a hybrid modulation not only depending on quadrature phase shift keying, but also based on binary phase shift keying for accurate cancellation of periodic blockage. On the other hand, we apply a chaotic interleaving scheme with a hybrid modulation scheme in order to achieve a better Bit Error Rate (BER) performance in LOS and NLOS environments. Finally, we validate the mathematical analysis of the proposed scheme through simulations. We evaluated the performance of the proposed scheme and performed a comparison with conventional schemes. Our results show that the proposed scheme is significantly capable of reducing the acquisition time and working with various velocities of helicopter blades in addition to providing a better BER performance in shadow fading environments. |
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