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Recently, it has been studied how to reduce the probability of interception and to increase the efficient security in the wireless digital communication systems. Among the possible approaches for the information security, the chaotic signal can be used to encode information very efficiently in many ways due to the inherent characteristic of irregularity. In this paper, in noise and interference environment,...
In this paper, we will discuss the oscillation of solutions of higher-order nonlinear delay dynamic equations on time scales, which have the following form $$S_n^\Delta(t, x)+p(t)f(x(\tau(t)))=0.$$ We will establish some oscillation criteria for these dynamic equations. Our results improve some previously obtained ones.
Due to the coexistence of different generations of mobile radio technologies, more and more mobile network operators are keen on deploying multiple radio technologies on a single cell site and carry their traffic over a common transport network. This paper studies such a collocated multiradio system: collocated LTE and HSDPA. Firstly, we investigate the potential gain by using a shared transport network...
Time Reversal (TR) technique is applied to localize an UWB source inside a building or buried under rubble produced by disasters. The reversed field is calculated by the FDTD-TR method applying as boundary conditions the field measured, but reversed in time, at some observation points located on the boundary. A refinement of the estimated position of the UWB emitter is carried out by a novel method...
Recently new Residue Number Systems (RNS) moduli sets have been proposed in order to increase the dynamic range and reduce the width of channels, therefore, reducing the processing time and further exploiting the carry-free characteristic of the modular arithmetic. In this paper we propose improved units for addition, subtraction, and multiplication in RNS for modulo {2^n+-k}. With this work, the...
In the paper a novel method for passive fractional delay filter design based on the distributed maximal flatness method is presented. The proposed approach is based on the design method of the one of the most commonly used fractional delay filters - the maximally flat filter. This filter demonstrates the excellent performance only in a relatively narrow frequency range around zero frequency but it...
Abstract-this paper presents an interest - based mobility model in order to portray the social property of opportunistic networks. In this model, mobile node and the geographical area is assigned to a multi-dimensional interest vector, and the probability of a region is selected as the moving target by a node is related with the inner product of two interest vectors and geographical distance between...
In Wireless Local-Area Networks (WLANs), most of the wireless Access Points (APs) work at the full power level. So, the conflicting channels may have a significant and inevitable impact on throughput and transmission delay when the density of the APs is increasing. This paper proposes a power control algorithm, Dynamic Power Control called DPC based on NetFlow. DPC applies a fine tuning idea to get...
Cloud infrastructure providers (CIPs) usually build a large number of geo-distributed data centers to cater to the recent proliferation of Cloud Computing. The CIPs commonly use multiple internet service providers (ISPs) to interconnect their geo-distributed data centers. Diurnal patterns and leftover bandwidth were effectively exploited by past studies to improve bandwidth utilization and minimize...
The configuration of WLAN MAC by means of Super Frame (SF) and Contention Free Period (CFP) variation is one of the effective schemes to provide QoS to interactive multimedia (IMM) traffic. In this paper we investigate the usefulness of an auto-generated dynamic parameter set of CFP and SF combinations as the logical look-up table for the WLAN medium access control scheme. A modified analytical model...
In this paper, we present an arithmetic Sum-of-Product (SOP) based approach to implement an efficient Discrete Fourier Transform (DFT) as well as an FIR filter circuit. Our SOP based DFT engine uses an improved column compression algorithm, and also handles the sign of the input efficiently. The partial products of the computation are compressed down to 2 operands, which are then added using a single...
In this paper we have proposed a technique for cooperative localization where localization is done in distributive fashion without using any additional broadcast by nodes. The method relies on a fixed scheduled ultra-wideband (UWB) pulse transmissions by nodes in a predetermined way. The advantages of the proposed method is simpler hardware, comparatively less pulse transmission in the system hence...
An output feedback model reference adaptive controller is developed for a class of linear systems with multiple unknown time-varying state delays and in the presence of actuator failures. The adaptive controller is designed based on SPR-Lyapunov approach and is robust with respect to multiple unknown time-varying plant delays and to an external disturbance with unknown bounds. Closed-loop system stability...
This paper focuses on the problem of exponential synchronization of complex dynamical networks (CDNs) with time-varying coupling delay and sampled-data. An improved synchronization criterion is derived for the considered CDNs in terms of the free-weighting matrix method and input delay approach. The design method of the desired sampled-data controller is proposed. The derived result is numerically...
In Underwater sensor networks (UWSN), Nodes are powered by battery. So saving energy is an important factor to estimate routing protocol. In this paper, we briefly introduced the vector-Based Forwarding and proposed an energy balance method to improve the lifetime of originate VBF. We sensor the energy information of neighbor nodes and decide whether participate in transport packets according the...
In Vehicular Grid Sensor Network (VGSN), because the operation of individual vehicles and mobile speed and direction, contact between them fragile and unstable. It has multicast links suddenly fail to overcome the problems, so that the message flows to each node, and increase the volume of traffic control. In this paper, we propose a fuzzy-based target tracking scheme that will re-route the link path...
LED-ID (light emitting diode - identification) is considered as a strong candidate for the future lighting technology due to its lower consumption, lower voltage, longer lifetime, smaller size, and cooler operation. A key issue in LED-ID systems is the guarantee of seamless connectivity when an user, as known as reader, moves from coverage area of a tag to another tag's coverage area. Link switching...
Input/Output Buffer Information Specification (IBIS) behavioral models are widely used for circuit-level signal integrity (SI) analysis due to its fast simulation speed and good accuracy. This work presents a tool to generate models of circuits specified by IBIS models. The model generation tool estimates poles, rise time and fall time of a circuit specified by IBIS models. The method consists of...
The hardware implementations of decimal arithmetic operations, which are commonly used in financial, scientific, and internet-based applications requiring accuracy and speed, become prominent. In this paper we first analyze the column sum boundaries of n-digit parallel decimal array multipliers (PDAM). A general form of the problem is formed and a heuristic solution is found with Genetic Algorithm...
Inspired by clustered photolithography tools in semiconductor wafer manufacturing, we study flow lines with deterministic process times subject to random state dependent setups. For tractability, we assume that the setup probability is constant and independent from customer to customer; the setup duration is constant. We show that the internal state of such a flow line can be modeled as a Markov chain...
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