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Two dimentional (2D) adaptive digital beamforming is one of the promising smart antenna technologies to meet the rapidly increasing demands for more capacity of satellite communication systems. However, the conventional 2D adaptive digital beamforming algorithms have the jitter and high sidelobe problems especially when the number of antenna elements is large. In this paper, a penalty function based...
In this letter, we investigate the problem of in-phase (I) and quadrature (Q) imbalance compensation in orthogonal frequency division multiplexing direct conversion receivers. A blind method is proposed to estimate and compensate for the frequency-dependent I/Q imbalance based on the kurtosis criterion. The global minimization of the kurtosis based cost function is proven. Simulation results are given...
A multi-port power amplifier (MPA) is a multi-input multi-output system that is capable of amplifying multiple input signals simultaneously by a set of shared power amplifiers without mutual interference. In a practical MPA, the component imperfections reduce the port isolation, which introduces leakage or cross-port interference. A patent-pending type-based calibration technique is studied in this...
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