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A sequential test is proposed for detection and isolation of hubs in a correlation graph. Hubs in a correlation graph of a random vector are variables (nodes) that have a strong correlation edge. It is assumed that the random vectors are high-dimensional and are multivariate Gaussian distributed. The test employs a family of novel local and global summary statistics generated from small samples of...
This paper studies global channel state information (CSI) in time-slotted wireless ring networks with time-varying reciprocal channels. Lower bounds on maximum and average staleness of global CSI are derived, and efficient protocols that achieve the bounds are developed. Two extreme scenarios are considered with either (i) one node transmitting at a time or (ii) the maximum number of nodes transmitting...
In this work, we consider distributed adaptive learning over multitask mean-square-error (MSE) networks where each agent is interested in estimating its own parameter vector, also called task, and where the tasks at neighboring agents are related according to a set of linear equality constraints. We assume that each agent knows its own cost function of its vector and the set of constraints involving...
Detection of the existence of data streams drawn from outlying distributions among data streams drawn from a typical distribution is investigated. It is assumed that the typical distribution is known and the outlying distribution is unknown. The generalized likelihood ratio test (GLRT) for this problem is constructed. With knowledge of the Kullback-Liebler divergence between the outlier and typical...
Two philosophically different approaches to the analysis of signals with imperfect cyclostationarity or polycy-clostationarity of the autocorrelation function due to warping are presented. The first approach consists of directly estimating the time-warping function (or its inverse) in a manner that transforms data having an empirical autocorrelation with irregular cyclicity into data having regular...
Recent evidence suggests that neural information is encoded in packets and may be flexibly routed from region to region. We have hypothesized that neural circuits are split into sub-circuits where one sub-circuit controls information propagation via pulse gating and a second sub-circuit processes graded information under the control of the first sub-circuit. Using an explicit pulse-gating mechanism,...
A radix-4 energy efficient carry-free truncated multiplier is proposed and designed based on a linear array left-to-right carry-free (LRCF) multiplier [1]-[3]. In our proposed multiplier, the final product is obtained in parallel with the reduction of partial products in carry-save form using an improved on-the-fly conversion of O(n) size based on conditional adders. In addition to the proposed multiplier,...
In this work we characterize all ambiguities of the convolution on two fixed finite-dimensional complex vector spaces. It will be shown that the convolution ambiguities correspond to factorization ambiguities in the z-domain, which are generated by swapping their zeros. We use this polynomial description to show a deterministic version of a recently introduced masked Fourier phase retrieval design...
Decentralized coded caching is studied for a content server with N files, each of size F bits, serving K active users, each equipped with a cache of distinct capacity. It is assumed that the users' caches are filled in advance during the off-peak traffic period without the knowledge of the number of active users, their identities, or the particular demands. User demands are revealed during the peak...
In modern data-centric wireless networks, caching alleviates severe capacity crunch at times of high network load. Recent results have shown that careful design of cache storage to leverage coded multicast file delivery over a shared link can achieve order-wise improvements in the storage-rate trade-off. In this work, we present a novel caching and delivery scheme for the case when users have heterogeneous...
This paper presents the close-form expression of the spatial security outage probability, which is a novel performance metric that measures the security level of the legitimate transmission from the spatial aspect in the presence of Poisson Point Process distributed eavesdroppers. Beamforming is used to create the exposure region where any randomly located eavesdropper causes secrecy outage, based...
A novel approach to design capacity-approaching variable-length constrained sequence codes has recently been developed. A critical step in this design process is the construction of minimal sets based on a finite state machine description of the encoders. In this paper we propose three generalized criteria to select the state that will result in construction of the minimal set with the best achievable...
In this paper, decentralized change point detection problem with optional observations at the fusion center is considered. In the model considered, there are two sensors: a peripheral sensor and a coordinating sensor. At each time, the peripheral sensor decides whether to stop and send an alarm to the coordinating sensor or to continue making observations. Once the coordinating sensor receives an...
In some recent applications involving large-scale data analytics, a plurality of data streams are sequentially observed in parallel, and the statistical decision maker is asked to screen out among these data streams those that exhibit certain characteristics. Motivated by such setting, in this work, a parallel sequential change detection model is investigated. In the model, a plurality of independent...
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