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The task of compressed sensing is to recover a sparse vector from a small number of linear and non-adaptive measurements, and the problem of finding a suitable measurement matrix is very important in this field. While most recent works focused on random matrices with entries drawn independently from certain probability distributions, in this paper we show that a partial random symmetric Bernoulli...
Three-dimensional fuzzy logic controller (3-D FLC) is a new FLC which was developed recently for spatially-distributed systems. In this paper, we present a novel scaling factors online tuning method for 3-D FLC, which can improve the performance of the system without models. The simultaneous perturbation stochastic approximation (SPSA) optimization algorithm is used to adjust the scaling factors by...
In currently cooperative spectrum sensing, each secondary user requires some information in order to achieve the vacant spectrum sensing. Energy detection is commonly used in local spectrum sensing. However, performance of cooperative spectrum sensing based on energy detection is damaged due to the noise uncertainty in realistic environment. In this paper, blind source separation algorithm is introduced...
A new two-user cognitive radio channel model with partial knowledge of the primary messages at the cognitive transmitter is proposed in this paper. It is the combination of the interweave channel and the interference channel. The new channel model has two advantages. First, by introducing the switch concept, the spectrum sensing is combined to the channel model. Second, by introducing the compression...
Spectrum sensing is a key technology in cognitive radio. Result of cooperative spectrum sensing depends on credibility of local spectrum sensing. But there is a lack of considering it in current schemes. In this paper, we think that different cognitive nodespsila SNRs lead to different reliability of each nodepsilas local sensing results. Firstly, we analyze the effects of cognitive nodespsila SNRs...
Image registration is widely used in remote sensing image processing, medical image analysis and many other fields. Mutual information-based image registration technique gained much attention recently. However, during the optimization procedure, because of the influence of interpolation and the changes of overlapping areas in the images, the object function of the mutual information method may converge...
Most existing two dimensional (2-d) direction of arrival (DOA) estimation methods are based on circular signal model. Little effort has been spent in developing 2-d DOA estimation for noncircular (NC) signals because the estimation of the natural phase increases the computational complexity. In this paper, we propose a new 2-d DOA estimation method NC signals based on L-shape array. The first dimensional...
Information privacy is usually concerned with the confidentiality of personally identifiable information (PII), such as electronic medical records. Nowadays, Web services are used to support different applications which may contain PII, such as healthcare applications. Thus, the information access control mechanism for Web services must be embedded into privacy-enhancing technologies. Further as application...
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