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This paper will look at how the growth of open data and APIs on the Web can be leveraged by intelligent systems to empower new types of flexible, dynamic interactive television applications. Examples will be given from the ConnectME and LinkedTV projects.
This paper defines new architecture for fast handover in WiFi networks based on the idea of Personal AP and centralized management. New enterprise solutions achieve their limits for real-time multimedia communication, but they are in general expensive and not widely deployed. The majority of them is based on the 802.11r standard, which targets a 50 ms handover. The proposed architecture targets a...
In this paper we provide a comparative study of several conventional face recognition methods (PCA, KPCA, GDA, SVM and RBF) that are suitable to work properly in multimodal systems. Performance of these systems is often influenced by various negative effects of the real-world environment. We evaluate the influence of varying illuminations and pose of faces on face recognition accuracy. Based on the...
The characteristics of mobile ad hoc network result in necessity of using the simulation for verification of newly proposed concepts in mobile ad hoc networks. Traditional network simulators are oriented towards low level simulation, which leads to various difficulties when these simulators are used for simulation of high level aspects of mobile ad hoc networks. This paper proposes the use of multi-agent...
Exposing the fundamental network capabilities on behalf of the mobile network operator may offer innovative way for the service providers to provide more user-oriented services. The network capability we focus on is online charging, and in particular the lack of functional relationship between the online charging and the service delivery processes (other than the obvious one, reducing the available...
An optimized broadcast protocol is proposed for VANETs. It is based on two key information: the direction to the destination and the beamforming angle θ. The efficiency of this technique is demonstrated in terms of packet delivery, bandwidth gain and probability of transmission success. An analytical model is developed to calculate the transmission area. This model allows capturing the propagation...
Efforts are underway in improving power conservation in WLAN devices and thus increasing the duration between recharging the battery. In order to evaluate the performance of new energy saving methods, there is a need for analytical tools. This paper proposes a simple analytical model that provides the average power consumption of a WLAN device. The proposed model is based on Markov models that provide...
In this paper we propose the channel assignment scheme for multi-channel wireless mesh network (WMN), where each mesh router is equipped with multiple radio interfaces. In real WMN the number of radio interfaces is much higher than the number of non-overlapping channels, which causes a lot of connections between mesh nodes operate on the same radio channel. Increasing number of simultaneous transmissions...
Past research has proposed the usage of assisting cells with Multimedia Broadcast/Multicast Service (MBMS) over a Single Frequency Network (MBSFN) to increase the the Spectral Efficiency (SE) of LTE. In this paper we propose and investigate a method for optimizing the power consumption of the network while retaining an acceptable SE for most users. We design an algorithm that makes use of genetic...
Mobile Digital TV environments demand flexible video compression like Scalable Video Coding (SVC) because of varying bandwidths and devices. Since existing infrastructures highly rely on H.264/AVC video compression, network providers could adapt the current H.264/AVC encoded video to SVC. This adaptation needs to be done efficiently to reduce processing power and operational cost. This paper proposes...
We consider a network selection problem for a group of mobile clients that operate in a heterogeneous wireless access network environment and that are equipped with multiple access network interfaces. The involved networks cooperate in order to improve their own, and the mobile clients' performance. We formulate the problem as a team decision problem. In this formulation, several decision variables...
The 802.11n standard promises to extend todays most popular WLAN standard by significantly increasing reach, reliability, and throughput. Ratified on September 2009, this standard defines many new physical layer and medium access control (MAC) layer enhancements. These enhancements aim to provide a data transmission rate of up to 600 Mbps. Since June 2007, 802.11n products are available on the enterprise...
The IEEE 802.11 standard specifies a set of transmission rates among which the sender may select the most suitable one based on the channel conditions. Traditionally, the sender increases the data transmission rate upon receiving the various consecutive acknowledgement packets while the data transmission rate is decreased on the absence of acknowledgement packets. This procedure assumes that the channel...
Different guard interval techniques for the Orthogonal Frequency Division Multiplexing (OFDM) transmission are suggested to reduce the interference between successive symbols (i.e. Inter-Symbol Interference, ISI) and interference between different carriers within the same symbol (i.e. Inter-Carrier Interference, ICI). In this paper, the impact of replacing the Cyclic Prefix (CP) by zeros insertion...
This paper presents a new method for compression of audio and speech signals based on sinusoidal modeling with added wavelet based coding of the residual signal. Wavelets are introduced as effective tool for representation and compression of atonal and transient signals. The method is proposed for usage in audio and speech databases. There are compared two variants of presented method, one using 1D...
This paper dealt with several security aspects in multimedia systems. The possible threads of various attacks are summarized and described. The methods focused on the intrusion detection and protection, the tools that manage the trusted use of digital media content (Digital Rights Management -DRM), as well as approaches for user's data privacy are also presented in the paper. Within HBB-Next architectural...
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