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In MIMO HF sky-wave radar, the spatial spectrum estimation technology is used to obtain the estimates of the Direction-Of-Departure (DOD) and the Direction-Of-Arrival (DOA) of signals of interest and the “undesired” signals for suppressing the multipath clutter of the instability ionosphere layer. However, in the case of low Signal-to-Noise Ratio (SNR), the biases of the estimates of the direction...
Electromagnetic (EM) waves carrying orbital angular momentum (OAM) has special spatial helical wave front. However OAM-carrying beam generated by uniform circular array is not in a pure OAM state. This paper firstly analyzes the origin of superposition for OAM-beam generating, then pure OAM mode distribution is analyzed in local region. Based on orthogonality property of OAM modes, Fast Fourier transform...
Similarity calculation has many applications, such as information retrieval, and collaborative filtering, among many others. It has been shown that link-based similarity measure, such as SimRank, is very effective in characterizing the object similarities in networks, such as the Web, by exploiting the object-to-object relationship. Unfortunately, it is prohibitively expensive to compute the link-based...
Influence between objects needs to be assessed in many applications. Lots of measures have been proposed, but a domain-independent method is still expected. In this paper, we give a probabilistic definition of influence based on the random walker model on graphs. Two approaches, linear systems method and Basic InfRank algorithm, are shown and return equal results, but Basic InfRank is more efficient...
With the development of power markets, forecasting is becoming more and more important in such new competitive markets since the electricity demand forecasting is the basis of decision making for participants in electricity market. The aim of this project is to develop an electricity demand predictor. In this paper, we present an Grey-based prediction algorithm to forecast a long-term electric power...
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