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Designing a robust, queue model for networking architectures is both complex and challenging. Validity, fairness and generality are key success elements in each examined modeling scheme. In this paper, we present a working scheme refered to as Network Queue Set Theory (NQST), based on Continuous Time Markov Decision Process (CTMDP) and Set Theory. From this original work, we delineate the referenced...
In this paper, the statistical properties of a change detection algorithm are considered. More specifically, we considered the exponentially weighted moving average (EWMA) algorithm. Analytical expressions for the probability distribution of detection delay and the time between false alarms are proposed, and the results are validated by simulations. The results can be used in examining the abrupt...
In this paper, we analyse the delay performance of a point-to-multipoint cognitive radio network which is sharing the spectrum with a point-to-multipoint primary network. The channel is assumed to be independent but not identically distributed and has Nakagami-m fading. A constraint on the peak transmit power of the secondary user transmitter (SU-Tx) is also considered in addition to the peak interference...
This paper presents results of the Seventh Framework Programme (FP7) LOLA (achieving LOw LAtency in wireless communications) project about the design of a cooperative broadcast (CB) technique based on a decode and forward (DF) protocol, in the context of a clusterized wireless mesh network (WMN) based on 3GPP LTE PHY/MAC layers. The CB technique is compared to a baseline broadcast technique, obtained...
A novel consensus-based protocol is developed for estimating the load information at nodes in a distributed computing system operating over a partially connected communication network. The challenge in such estimation process arises from the existence of tangible delays in the exchange of information, and the fact that loads are dynamic since nodes continue to execute their loads while the estimation...
To address the security and performance challenges, a novel smart grid communication system based on the frequency-hopping (FH) technology is investigated in this paper. A new FH sequence set with various levels of Hamming cross-correlation values is proposed for this system in order to endow the power users various qualities of services (QoSs). By using the real measurement, we propose a statistic...
In order to implement the heterogeneous wireless network using multiple wireless systems, it is important to comprehend the transmission quality characteristics such as the transmission throughput and delay, because the network control managements are performed based on these qualities. In this paper, we address the study results regarding the transmission quality characteristics of the Wireless LAN...
Existing in-network query processing techniques are categorized as approximation and aggregation based approaches. The former achieves lower query response delay at the expense of accuracy, while the latter reduces query response inaccuracy by executing queries at the actual sensor nodes resulting in longer delay. In this paper, we propose a query processing framework which is delay as well as accuracy...
A hybrid model based iterative learning control method, called HMILC, which combines the strengths of a deterministic model and a stochastic model, is developed. The deterministic model based controller can respond quickly to deterministic changes, such as set-point changes and drifts, while the stochastic model based controller is effective in minimizing the effects due to random inputs, such as...
One of the main challenges in wireless industrial networks is the delay caused by shared, error-prone and non-deterministic behaviour of wireless communication medium. In this paper, a cross-layer adaptive space-time coding scheme has been proposed for the multiple-input multiple-output (MIMO) based IEEE 802.11 Soft-Real-Time Wireless Industrial Networks. Using this technique, packet delay for real-time...
When CMOS is operated at a supply voltage of 0.5V and below, Random Dopant Fluctuations (RDFs) result in a stochastic component of logic delay that can be comparable to the nominal delay. Moreover, the Probability Density Function (PDF) of this stochastic delay can be highly non-Gaussian. The Non-Linear, Operating Point Analysis of Local Variations (NLOPALV) technique has been shown to be accurate...
In this paper, we derive the probability density function and cumulative distribution function of packet transmission time in a spectrum sharing system. In combination with the time-out characteristics of packets, we further study the outage probability and average transmission time under peak power interference constraint over Nakagami-m fading channel. Especially, we employ the M/G/1 queuing model...
Several approaches have been proposed for the accurate and efficient estimation of the on-chip interconnect delay and slew metrics. Moments of the impulse response are widely used for interconnect timing analysis, from the explicit Elmore delay (the first moment of the impulse response) expression, to moment matching methods which creates reduced order trans-impedance and transfer function approximations...
This paper addresses the problem of assessing the effect of communication delays on the control performance of a platoon of two vehicles. We consider Bluetooth communication and develop a simple stochastic model for the Bluetooth delay distribution. It is shown that due to the long tails of this distribution, the computation time of a Monte Carlo approach would be prohibitive when assessing the effect...
In the last years, several wireless standards have been profitably tested for possible application in factory communication systems, showing encouraging results even in time-critical applications. However, the achieved performance are clearly related to the specific applications considered and, more important, to the specific wireless components employed. In this paper, we consider the wireless extension...
This paper proposes a new method based on the combination of a soft-decision ranging and Maximum A Posteriori (MAP) estimation for Impulse Radio type Ultra Wide Band (UWB-IR) Time of Arrival (TOA) localization. The soft-decision ranging assigns the probability of being generated by a signal to each component in the observed instantaneous power delay profile (the probability density function (pdf)...
Tracking constitutes a major challenge in Ultra-Wideband (UWB)communications due to dense multipath environment and low power consumption. Most of the existing studies on tracking fall within low rate Impulse Radio UWB (IR-UWB) scope, with the assumption that Inter-Frame Interference (IFI) or Inter-Symbol Interference (ISI) is absent. In this paper, we settle on high rate Direct-Sequence UWB (DS-UWB)...
This paper proposes a space-time statistical geometric model for characterization of multipath propagation of the satellite communication, which provides some insight into the spatial properties of wideband channels. The Closed-form explicit expressions of the probability density functions (pdf) of the time of arrival (TOA) for multipath signals and the power delay profile according to the various...
In this paper the problem of detecting the channel state between LOS and NLOS conditions is addressed using UWB signals. A new distribution-based identification approach is proposed and its performance is compared with that of other classic schemes. To this purpose experimental data collected in realistic environments have been used.
As integrated circuit process technology is changing into the ultra deep submicron era, the complex interconnection topology and metal resistance shielding effects problem is very serious, resulting in very stiff interconnection structure. As inaccurate delay on stiff interconnect sinks creates a situation where decisions on when to evaluate by statistical static time analysis (SSTA) are not cluster...
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