Modern wireless sensor networks (WSNs) for Internet of Things (IoT) applications require low-complexity algorithms positioning, due to the large number nodes with low power consumption. Thus, simple received signal strength indicator (RSSI) based ranging techniques represent an attractive option systems such as LoRa ones. However, interactions RSSI a real-world environment are difficult predict and often lead significant errors in localization process. Based on this, novel algorithm is...

The work presented in this article describes a tool for object tracking, notes insertion, and information retrieval, applicable to MPEG-2 sequences. Maximum compliance with the MPEG standard is sought, so added transmitted as side without affecting actual video-audio stream defined standard. Additional processing sequence, allowing automatic tracking of one across different groups pictures. Results show that proposed algorithm capable objects good degree precision. Features are included...

Previous works have introduced models based on deterministic chaos equations, aiming to simulate transmission processes over mobile radio digital channels at the level of post detection error stochastic process and reproduce their renewal or nonrenewal behaviors. In particular bursts clusters errors are generated by these models, exploiting correlation between successive points sampled from trajectories suitable strange attractors. this paper equation reviewed relevant results discussed....

Applications of clustering and neural network techniques to channel equalization have revealed the classification nature this problem. This paper illustrates an implementation a global system for mobile communications (GSM) receiver in which demodulation are realized by means nearest neighbor (NN) classifier algorithm. The most important advantage using such is significant reduction terms computational complexity compared with maximum likelihood sequence estimation (MLSE) equalizer. proposed...

In cognitive radio networks (CRNs), knowledge of the primary users (PUs) position can be used to avoid harmful interference network, while at same time exploited improve CR performance. this paper, a localization algorithm is developed calculate PUs and novel location based (LCR) routing protocol proposed that has following properties: (i) it considers existence heterogeneous PUs, (ii) exploits information, (iii) jointly selects spectrum route, (iv) protects from interference. Clusters CRs...

The growing spectrum crunch has motivated exploratory efforts in the use of LTE 5 GHz bands for downlink traffic. However, this paradigm raises concerns fair sharing and adverse impact scheduled frames on Wi-Fi Packet Success Rates (PSR). To address issue, we propose E-Fi, an interference-evasion mechanism that allows devices to survive transmissions without any cooperation between these two different standards. Different from existing approaches, argue simple Almost Blank Subframes (ABS)...

In this paper, a novel Cognitive Radio Resource Management (RRM) is proposed to improve the spectrum utilization efficiency. system, heterogeneous Primary Users (PUs) with multiple features are considered where these PU exploited adaptability in (CR) networks and, thus, design an efficient RRM. An optimization framework developed by considering PUs and variable CR demands while assuring interference protection towards PUs. A suboptimal solution after showing that optimal computationally...

A novel approach to model mobile radio channels (in particular, DECT ones) is introduced, using nonlinear equations proposed by chaos theory. simple procedure extract meaningful statistics from strange attractors' trajectories presented, and some results well matched with those obtained standard generative models are shown. Although introducing a quasi-deterministic behavior, the chaotic seem be sufficient mimic apparently random error patterns exhibited channels. An initial attempt made...

Cell sectorization is a common approach used in cellular systems to increase system capacity. In this paper novel downlink spatial filtering based on clustering algorithms proposed for UMTS-FDD networks. more details, the well known segmentation algorithm K-means applied grouping users order define beams. It assumed that direction of arrival received uplink channels at base-station. The ability automated scheme evaluated by comparing computed beams with optimum ones obtained heuristically...

We analyze traffic traces obtained from measurements at the edge gateway of campus network University Pavia. These have been simply using tcpdump utility and then analyzed modeled two different approaches. The first is based: on a hidden Markov model (HMM) other stochastic generator based chaotic attractor. It shown that HMM capable capturing general statistics observed streams despite poor long term correlation characteristics, while can achieve somewhat better results in characteristics...

The ability of adapting to the environment in most efficient way is a crucial issue Cognitive Radio (CR) networks. For this purpose, an accurate estimation characteristics and activity Primary Users (PUs) required. A system that takes into account heterogeneous PUs with several features developed. new scheme integrated exploit these motleys improve adaptability CR Through proposed PU signal type recognition, detected classified. each type: allowed interference levels, bandwidth idle time,...

In this work, we design a multiple description coding (MDC) system for video streams moving from the concept of spatial MDC and introducing an efficient algorithm to obtain sub-streams that exploits some form scalability. We first generate four subsequences by sub-sampling, then, these

Efficient and reliable techniques are key factors in the delivery of multimedia information over networks such as mobile ad hoc internet. Existing works tend to mix source coding like multiple description scalability with network path diversity forward error correction capabilities (FEC) or more recently rateless codes. In this work we exploit all these propose a technique that generates H.264 compatible scalable streams which sent independent paths using The amount allowed redundancy is...

In the immediate future video distribution applications will increase their diffusion thanks to ever-increasing user capabilities and improvements in Internet access speed performance.The target of this paper is propose a content delivery system for real-time streaming services based on peer-to-peer approach that exploits multicast overlay organization peers address challenges due bandwidth heterogeneity.To improve reliability flexibility, coded using scalable multiple description allows...

Source modelling is one of the fundamental issues in studying performance networks under different traffic conditions. Previously, emphasis has been put on output digital video sources to determine actual load and its temporal correlation. In this paper we propose a new approach based use chaotic equations generate simulated MPEG sequences. The performances an ATM node carrying are observed using both "real" "chaotic" input sources. We show that proposed model accurate enough capture...

Rate vs. quality is a crucial trade off not only for efficient video coding and transmission but also adaptive strategies in wireless networks and/or congestion-prone networks. Scalable coders are well suited to tackle the time-varying capacities of these environments. In this paper

Equalization of ISI is usually performed in the time domain. In fact it difficult to operate frequency domain, since with usual spectral techniques based on Fourier transform, correspondence between temporal and components lost transformation. this paper we present an application wavelet transform that exploits joint time-frequency representation equalize channels affected by ISI. It shown using description wavelets as filters, exploiting multispectral decomposition received signal, can be...

In this paper we introduce some significant improvements to a well known algorithm for multicast in overlay networks, namely ZigZag. The are mainly related better handling of peer churn, avoiding service interruption the subtree rooted at departed node. Since target is video streaming service, additional constraints minimum serving quality outgoing links. This translates maximum number children each node depending on its link capacity: allow this, more realistic heterogeneity introduced so...

In this paper we address the problem of video transmission over unreliable networks. The proposed approach moves from concept multiple description coding (MDC) introducing some simple algorithms to obtain sub-streams concepts either spatial, temporal, SNR adaptation. have been implemented as pre- post- processing basic H.264/SVC codec. Although in principle many descriptions desired can be generated, simulation results using only two show good both when all are received and one is received....

This paper presents a joint symbol timing recovery and equalization scheme for short burst transmission formats, useful in modern wireless systems, like, instance, time- division multiple access schemes future packet data networks. Both aided decision directed solutions are considered the optimization performance is pursued by means of an iterative which exploits error function sampled at rate, implemented Farrow structure interpolation filter. Equalization obtained zero forcing linear...