Nonlinear Distortion in a Microwave High Power Amplifier

This paper describes a cyclic algorithm for minimization of signal sidelobes and crosstalk in multiple-input multiple-output (MIMO) radar. The algorithm, called SWAP by the authors, is suitable mainly for long-range radars, such as ground-based surveillance, approach, or weather radar. The minimization of energy, minimization of side lobes, and crosstalk were used as the optimization criteria. Although the optimized signals do not maintain a strictly constant envelope, the peak-to-average power ratio (PAR) can be maintained below 1.7. This value is acceptable, especially for radars with modern transmitters based on GaN HEMTs. The algorithm allows for any arbitrary choice of elements weights, enabling the optimization of calculations for a wide range of applications. The effect of the Doppler shift can also be included in the optimization. This article also presents the results of algorithm testing under various conditions. The designed algorithm makes it possible to suppress the side lobes and crosstalk by up to 20 dB more than the matched filters. These results were achieved at the cost of a slight deterioration in signal-to-noise ratio (SNR) loss (less than 1 dB) and an increase in PAR (up to 2). The resolution of weak close targets is also slightly deteriorated. The algorithm converged quickly, and already after ten or 20 iterations, the results changed only minimally.

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IMD Analysis of the Output Section of an RF Power Amplifier Using Volterra Series

Aydın¹

2020

2020 International Conference on Electrical, Communication, and Computer Engineering (ICECCE)

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Nonlinear Distortion in a Microwave High Power Amplifier

Cited by 4 publications

References 17 publications

Energy-efficiency schemes for base stations in 5G heterogeneous networks: a systematic literature review

Energy-efficiency schemes for base stations in 5G heterogeneous networks: a systematic literature review

Joint Optimization of Signal Waveforms and Filters for Long-Range MIMO Radars

IMD Analysis of the Output Section of an RF Power Amplifier Using Volterra Series

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