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How to reconstruct a high resolution and quality from low resolution images captured from a digital camera is always the top target of any image processing system. Exploit the aliasing feature of sampled images, we propose a new technique to register exactly the motions between images, including rotations and shifts, by using only frequency domain phase-shift method. Based on registered parameters,...
In this paper we present a digital beamforming scheme for wireless communication systems based on high altitude platforms. The proposed digital beamforming scheme, which is installed on the platforms in high-altitude-platform (HAP) systems, can reduce significantly the number of antenna elements and the corresponding receiver modules, analog to digital (A/D) converters etc. without loss of performance...
This paper considers the effects of array imperfection and mutual coupling on performance of wideband direction-of-arrival (DOA) estimation in wideband smart antennas. A wideband DOA estimation method without array calibration is then proposed to deal with these effects using arbitrary antenna array of omnidirectional elements. The effects of array imperfection and mutual coupling as well as the efficiency...
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