The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Future home networking applications rely on a converged, robust and easy-to-use network infrastructure. When different technologies complement each other, high efficiency and high coverage range can be achieved. To support application fields like home automation, energy efficient technologies with low data rates must be integrated into the home network. These low data rate networks can be used to...
We study Dynamic Game situations with incomplete structural information, motivated by problems arising in electricity market modeling. Some Adaptive strategies are considered as an expression of the Bounded Rationality of the participants of the game. The Adaptive strategies are typically not in Nash equilibrium. Thus, in order to assess those strategies, two criteria are stated: Firstly, how far...
Time-dependent ARMA models are a preferred tool the identification of systems with non-stationary characteristics. In order to improve the tracking abilities of the model, the evolution of the time-dependent parameters is defined by either deterministic or stochastic paths. The Generalized linear Stochastic Constraint (GSC) TARMA models define the parameter evolutions by linear difference equations...
Filter bank-based multicarrier (FBMC) techniques have attracted a lot of interest in the last decade as a competitive alternative to the long established OFDM, particularly in wireless applications. Their potential stems from their increased ability to carrying a flexible spectrum shaping together with a major increase in spectral efficiency and robustness to synchronization requirements, features...
In this paper we review the waveform design of 4G (based on OFDM) and motivate the need for a redesign for 5G. Both the advent of the Internet of Things (IoT) and the move to user-centric processing are rendering OFDM unfeasible. With FBMC a potential contender has been promoted in recent years. Though FBMC is better suited than OFDM in theory, practical considerations pinpoint many issues of FBMC...
Although subspace-based direction-finding algorithms have been widely accepted as the most powerful method in estimating the source's directions-of-arrival, its derivation was based on the linear independence of the source's manifold vectors. An undesirable manifoldly ambiguous situation is said to occur when this condition is not satisfied. To minimize the presence of ambiguities, the recent work...
The insertion of new technologies in energy markets has created a framework full of opportunities concerning better energy planning. This study addresses the use of Power Supply Interruption as a tool for reducing consumers' demand voluntarily, also known as Voluntary Load Curtailment (VLC) programs. In VLC, a fee similar to a subsidy is paid to a consumer so as not to use energy for a certain time...
Recently, a few symmetrical predictor structure (SPS) based lossless / near lossless compression algorithms have been proposed, which can efficiently exploit the information from the neighboring pixels. Prediction stage of existing SPS algorithms uses least squares optimization, which is computationally expensive and only causal pixels are used for the bias cancellation stage. In this paper, we propose...
In this paper, we present some new results on the characterization of solutions of unknown linear systems. These naturally lead to highly reduced order models which can be developed from a small number of measurements. Such models are generalizations and extensions of Thévenin and Norton equivalents of classical circuit theory. They are very useful in engineering design in various fields. Illustrative...
We study leaderless attitude synchronization problem of multiple underactuated spacecraft in this paper. We adopt the special parameterizations of attitude proposed by Tsiotras et al. (1995) to describe attitude kinematics, which has been shown to be very convenient for control of underactuated axisymmetric spacecraft with two control torques. It is assumed that angular velocity commands are possible...
We consider how an iterative strategy for asymptotic average consensus in a directed graph (digraph) can be adapted so that the nodes can determine, in a distributed manner, a stopping criterion that allows them to terminate the execution of the iteration when approximate average consensus has been reached. The nodes are said to have reached approximate average consensus when each of them has a value...
The performance of a genetic algorithm (GA) with a new way of crossover proposed by authors before is evaluated quantitatively to verify its advantage. This new algorithm was proposed for interactive evolutionary face image beautifying system implemented on a small mobile device. Since the display size is small, GA must work effectively for a very small population size. The new crossover adopts internally...
In this paper, we propose a new hardware design of 8 × 8 multiple-input multiple-output — orthogonal frequency division multiplexing (MIMO-OFDM) system which has floating-point data processors in its receiver. For the hardware design of MIMO-OFDM systems, it is efficient to use fixed-point data processing in terms of high speed processing time and low power consumption. However, under some of poor...
The entities tracking within populations is a task encountered in many scenarios such as observations of the biological cells, studying behaviors of crowds, and evaluating transactions on the Internet. This paper outlines the optimality of a tracking process where associations between the entities in consecutive populations observed at discrete time instances must be determined. As the sub-optimum...
The stability of a large class of nonlinear, nonautonomous systems is analysed. In particular, our main contribution is to formulate some easier to verify sufficient conditions for asymptotic stability. To this end, invariance properties of the system are exploited even in the nonautonomous system case in order to derive a rank based asymptotic stability condition. The approach used in this paper,...
Densification is a key to greater throughput in cellular networks. The full potential of coordinated multipoint (CoMP) can be realized by massive multiple-input multiple-output (MIMO) systems, where each base station (BS) has very many antennas. However, the improved throughput comes at the price of more infrastructure; hardware cost and circuit power consumption scale linearly/affinely with the number...
This paper proposes a new pre-processing approach to a sequence of binarization process, by applying the discrete cosine transform (DCT) to document image prior to binarization. This procedure can be used as a complement or alternative to denoising process used in many binarization methods. Firstly, original document images are transformed by the DCT. Then, the transformed document images are passed...
Two main ingredients that enable wiretap codes to achieve information-theoretic secrecy are their binning structure and the randomization among multiple codewords. The presence of an infinite amount of randomness is an oversimplifying assumption which act as a hurdle that prevents the development of practical codes for wiretap channels. In this paper, we investigate the trade-off between the achievable...
Significant research effort has been drawn over the last few years to reduce the hardware complexity and size of Multiple Input — Multiple Output (MIMO) systems and to push this promising technology even to lightweight and small portable devices. Among other architectures, single-fed MIMO systems with compact parasitic arrays are a possible candidate toward this goal. To facilitate the study and design...
In this paper, we study linear precoding for a secure multi-cell massive multiple-input multiple-output (MIMO) downlink system employing artificial noise generation. We consider the large system limit where the number of base station antennas, the number of mobile users, and the number of eavesdropper antennas are all growing without bound but with fixed ratio. The proposed precoder is based on regularized...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.