Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
In military and defense communication systems, frequency hopping technique is considered one of the most effective electronic protective measurements to avoid jamming. Frequency hopping is performed by rapidly changing carrier frequencies during the communication. With the rapid growth of frequency hopped wireless networks, frequency detection and jamming has become a challenging task. In this paper,...
The shift of the Internet usage from a host to host interconnection to a content retrieval becomes an indisputable fact. Information Centric Networking (ICN) paradigm is proposed as a Future Internet architecture adapted to this change. By identifying the content and not the host, this new design enables many interesting features such as in-network data storage and caching. ICN network components...
Synchronization of a Wireless Sensor Network is a crucial task and is based on a precise syntonization of all clocks within the network. The synchronization precision is usually closely connected to the positioning accuracy in networks for the purpose of localization. This paper introduces a concept, how the clocks of low-complexity stationary receivers can be adjusted to the same frequency with the...
Velocity measurement is a basic task of radars. It is prerequisite for tracing and imaging. In this paper, a novel method is proposed to measure target velocity with high accuracy for linear frequency modulation (LFM) radars. Firstly, the new method implements the stretch processing of received signals to obtain intermediate frequency (IF) signals. Then the difference processing is applied to IF signals...
We address bandwidth and power constrained distributed vector estimation problem in a wireless sensor network where sensors observe a common unknown zero-mean Gaussian random vector with a known covariance matrix. Sensors transmit their quantized and digitally modulated correlated observations to a fusion center (FC), over orthogonal channels subject to fading and additive white Gaussian noise (AWGN)...
We evaluate an estimation scheme of unknown signal's bandwidth estimation with an energy detector based on a windowed fast Fourier transform (FFT) for cognitive radio system. When the cognitive node obtains the spectrum sensing results after a received time domain signal is processed with FFT, the detection results have a detection error at the adjacent FFT bins of the received signal frequency with...
In order to provide a reliable reception and decrease the packet retransmission, the wireless communication system should guaranty the accuracy of channel estimation. This implies that the channel estimation mean-square error (MSE) of the mobile terminals with various speeds should remain lower than a threshold. This usually causes higher pilot overhead in terms of more bandwidth and transmit power...
A method of passively estimating the resource block (RB) utilization rate of a serving cell according to radio-quality information measured by a user terminal is proposed. The estimated RB utilization rate can be regarded as the traffic load on the base station. The contribution of this paper is twofold: first, a method for passively estimating a traffic load on a base station via a user terminal...
Consumption of multimedia content is moving from a residential environment to mobile phones. Optimizing Quality of Experience -- smooth, quick, and high quality playback -- is more difficult in this setting, due to the highly dynamic nature of wireless links. A key requirement for achieving this goal is estimating the available bandwidth of mobile devices. Ideally, this should be done quickly and...
Load management is an essential and important factor for distributed simulations running on shared resources due to load imbalances that can caused considerable performance loss. This feature is essential for High Level Architecture (HLA)-based simulations since the HLA framework does not present the ability to manage resources or help detect load imbalances that could directly cause decrease of performance...
Big data analytics (BDA) applications are software applications that process huge amounts of data using large-scale parallel processing infrastructure to obtain hidden value. Hadoop is the most mature open source BDA processing framework, which implements the MapReduce programming paradigm. In many cases, BDA jobs are continuous and not mutually separated. Existing work on processing jobs in sequence...
Many target tracking algorithms for radar systems assume homogeneous backgrounds of clutter. However, real backgrounds are rarely homogeneous. By estimating background intensity, and using the estimate in the likelihood measure, the tracking algorithm is given the ability to adapt to the background. In this work, a method for estimating the clutter intensity is introduced. The method is based on locally...
The current implementation and operation of traffic control schemes by Internet service providers (ISPs) prevent subscribers from getting the benefits of full sharing of resources available in shared access networks, where the capability of allocating available bandwidth by a scheduler (e.g., weighted fair queueing (WFQ)) in an access switch is limited to traffic already shaped by token bucket filters...
Phasor measurement unit (PMU) performance depends on the performance of the PMU’s analog input section and the limitations of its DSP algorithms. For the different PMU performance requirements established in the standards, the relative importance of these two factors varies significantly. For steady-state frequency and rate-of-change-of-frequency (ROCOF) measurements, this paper shows that estimation...
We investigate the reach-increase obtained by optimizing the transmission symbol rate. We show that for PM-QPSK systems at full-C-band the increase may be larger than obtained through ideal single-channel backward-propagation, and similar for PM-16QAM.
This paper proposes the use of a kernel density estimation to measure similarities between trajectories. The similarities are then used to predict the future locations of a target. For a given environment with a history of previous target trajectories, the goal is to establish a probabilistic framework to predict the future trajectory of currently observed targets based on their recent moves. Instead...
Estimation of the channel distortion characteristics is of crucial importance for realizing a reliable communication. In order to estimate the channel, a received signal is sampled at some rate. The Nyquist rate is widely used notion to determine the sampling rate of the received signal. On the other hand, Vetterli introduced the concept of rate of innovation that is the degree of freedom of the signal...
We consider the problem of distributed estimation of an unknown zero-mean Gaussian random variable in a bandwidth constrained network, when only partial information of observation model is available. Sensors employ uniform quantizers with variable rates and transmit their quantized observations to a fusion center (FC). Assuming the FC employs the linear minimum mean-square error (LMMSE) estimator,...
UDT (UDP-based Data Transfer) is a high speed transfer protocol which can utilize available bandwidth in Long Fat pipe Network (LFN) sufficiently. Meanwhile, it can estimate available bandwidth much greater than the actual available bandwidth when network status is congested resulting in fairness problem. UDT estimates MTR (Maximum Transfer Rate) using pair packets on receiver side and calculates...
Recently, the live video streaming application using P2P multicasting called P2PTV attracts attentions as a means to deliver live streaming video to a large number of users since the server load becomes low compared with a unicast-based delivery. Since many current P2PTV services choose a relay peer for a newly joining peer without considering the network distance between peers, the end-to-end router...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.