In massive multiple-input multiple-output (MIMO) systems, hybrid analog-digital (AD) beamforming can be used to attain a high directional gain without requiring dedicated radio frequency (RF) chain for each antenna element, which substantially reduces both the hardware costs and power consumption. While MIMO transceiver design typically relies on conventional mean-square error (MSE) criterion, ...

Abstract There are many nanoscale pores in deep low permeability coal seams. The flow of coalbed methane (gas) belongs to the gas porous media with medium and high Knudsen numbers. Its mechanism is one key unsolved scientific problems. In order explore transport law nanopores coal, a model based on microscopic boundary restriction was adopted describe law, its rationality verified by experiment...

In this paper we propose a novel interest operator robust to photometric and geometric transformations. Our operator is closely related to the grayscale MSER but it works on the HSV color space, as opposed to the most popular operators in the literature, which are intensity based. It combines a fine and a coarse overlapped quantization of the HSV color space to find maximally stable extremal re...

The structure of document images plays a significant role in document analysis thus considerable efforts have been made towards extracting and understanding document structure, usually in the form of layout analysis approaches. In this paper, we first employ Distance Transform based MSER (DTMSER) to efficiently extract stable document structural elements in terms of a dendrogram of key-regions....

Many signal processing applications pose optimization problems with multimodal and nonsmooth cost functions. Gradient methods are ine!ective in these situations. The adaptive simulated annealing (ASA) o!ers a viable optimization tool for tackling these di$cult nonlinear optimization problems. Three applications, maximum likelihood (ML) joint channel and data estimation, in"nite-impulse-response...

In the field of wireless multimedia authentication unimodal biometric model is commonly used but it suffers from spoofing and limited accuracy. The present work pro-poses fusion features face fingerprint recognition system as an Improved Biometric Fusion System (IBFS) leads to improvement in performance. Integrating multiple traits performance improved thereby reducing fraudulent access.The pap...

Automated text detection is a difficult computer vision task. In order to accurately detect and identity text in an image or video, two major problems must be addressed. The primary problem is implementing a robust and reliable method for distinguishing text vs non-text regions in images and videos. Part of the difficulty stems from the almost unlimited combinations of fonts, lighting condition...

A novel method for digitization of paper structure, based on automated microtomy combined with optical microscopy, is presented. The concept is capable of obtaining digitized 3D paper structure data for sample areas in the range of several square millimeters within a time range of several hours. Individual fibers are tracked through the 3D fiber network using advanced image analysis algorithms....