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In this work we present the method for image retrieval based on the Non-Subsampled Contourlet Transform (NSCT) and the Harris corner detector. The NTSC-based interest point detector is proposed by combination of NTSC and Harris corner detector called the Contourlet Harris detector. We also present the method how to extract the image features using this(More)
In this paper, we propose a new wideband direction-of-arrival (DOA) estimation method for wideband smart antennas based on Frequency-Domain Frequency-Invariant Beamformers (FDFIB). By appropriately designing the weights for frequency-domain beamformers at different frequencies, the frequency-invariant beam-patterns are obtained. These beamformers play a(More)
F uture generations of wireless communication systems, such as fourth-generation (4G) mobile communication systems, broadband wireless access networks, are expected to provide a wide variety of services (e.g., mul-timedia, broadcasting, etc.) through reliable high-data-rate wireless channels. The high-data-rate wireless channels can be obtained with wide(More)
In this paper, spatial processing with lens antennas arrays for direction-of-arrival (DOA) estimation is considered. In this approach , when using the Multiple Signal Classification (MUSIC) algorithm, the dimension is reduced by the front end which performs spatial processing, resulting in increased computational speed and decreased computational load. As a(More)
In this paper, we present an optimal beamforming design for multi-user multiple-input multiple-output (MIMO) interference channels. Different from the conventional methods which are based on the sum-rate maximization or the sum mean square error minimization, this paper focuses on maximizing the energy efficiency (EE) of the system. We seek the optimal(More)
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