INFLUENCE OF TRANSMITTER NONLINEARITIES ON DATA TRANSMISSION FROM REMOTELY PILOTED AIR SYSTEM
DOI:
https://doi.org/10.18372/2306-1472.72.11979Keywords:
OFDM channel, transmitter nonlinearity, unmanned aerial vehicle communication channelAbstract
Purpose: 1) to develop a model of a communication channel of an unmanned aerial vehicle "UAV-Ground station" with adaptive modulation and orthogonal frequency division of channels; 2) to calculate the channel parameters with different types of fading for different levels of satellite transponder nonlinearity. Method: MATLAB Simulink software was used to simulate the channel operation. Results: Based on the IEEE 802.16d standard, a realistic model of the communication channel of the unmanned aerial vehicle "UAV-Ground Station" was developed, which is used to estimate the channel parameters. The channel model with adaptive modulation consists of a source of information, a transmitter, a downlink channel with fading, and a terrestrial station receiver. Dependences of the signal-to-noise ratio of the terrestrial receiver on the signal-to-noise ratio in the channel down for different types of nonlinearity of the unmanned aerial transmitter, various modulations (BPSK, QPSK, 16QAM, 64QAM), various types of fading are obtained. The signal constellations of the received signals for different Doppler frequency shifts are compared. Conclusion: The developed model allows determining the conditions under which the channel is "open" for a given type of a modulation and a data rate. The proposed approach can be considered as a method for estimating the parameters of the satellite communication channel of an unmanned aerial vehicle with fading.
References
EUROCAE WG73 UAS. Concept of RPAS Required Communication Performance Methodology for the Command, Control and Communication Link. Available at: https://www.uavdach.org/News/WG73_CClink_RRCPDraftforWG73CommentV0%2010.pdf.
Faezah J., Sabira K. (2009) Adaptive Modulation for OFDM Systems. International Journal of Communication Networks and Information Security, vol. 1, no. 2, pp. 1-8.
STANAG 4609/AEDP-8. NATO Digital Motion Imagery Format. Available at:
http://www.gwg.nga.mil/misb/docs/nato_docs/STANAG_4609_Ed3.pdf.
STANAG 7023/AEDP-9. NATO Primary Image Format. Available at: https://booksmovie.org/similar-pdf-stanag-7023-nato.html.
STANAG 4607/AEDP-7. NATO Ground Moving Target Indicator Format. (GMTIF). Avalable at: http://standards.globalspec.com/std/1300603/nato-stanag-4607.
O'Droma, M., Mgebrishvili N., Goacher A. (2004) Theoretical analysis of intermodulation distortion in OFDM signals in the presence of nonlinear RF high power amplifiers. IEEE 59th VTC, vol. 3, pp. 1295-1299.
Jantunen P. (2004) Modeling of Nonlinear Power Amplifiers for Wireless Communications. The thesis for the degree of Master of Science. Finland 138 p. Available at: <http://www.researchgate.net/publication/224263342_Nonlinear_RF_power_amplifier_behavioural_analysis_of_wireless_OFDM_systems>.
Gregorio F.H. (2007) Analysis and Compensation of Nonlinear Power Amplifier Effects in Multi-Antenna OFDM Systems. Dissertation for the degree of Doctor of Science in Technology, 133 p. Available at: http://lib.tkk.fi/Diss/2007/isbn9789512290017
El-Khatib Z., MacEachern, Mahmoud S.A. (2012) Distributed CMOS Bidirectional Amplifiers: Broadbanding and Linearization Techniques. Chapter 2. Modulation Schemes Effect on RF Power Amplifier Nonlinearity and RFPA Linearization Techniques. Analog Circuits and Signal Processing. Springer, 134 p.
Park D., Song H. (2007) A new PAPR reduction technique of OFDM system with nonlinear high power amplifier. IEEE Trans. CE, vol. 53, no. 2, pp. 327-332.
Cioni S., Corazza G. E., Neri M., Vanelli-Coralli A. (2006) On the use of OFDM radio interface for satellite digital multimedia broadcasting systems. International Journal of Satellite Communications and Networking, vol. 24, no. 2, pp. 153-167.
Varade S., Kulat K. (2012) BER Comparison of Rayleigh Fading, Rician Fading and AWGN Channel using Chaotic Communication based MIMO-OFDM System. International Journal of Soft Computing and Engineering, vol. 1, no. 6, pp. 2231-2307.
Roque D., Siclet C. (2013) Performances of Weighted Cyclic Prefix OFDM with Low-Complexity Equalization. IEEE Communications Letters, vol. 17, no. 3, pp. 439–442.
