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Conference proceedings front matter may contain various advertisements, welcome messages, committee or program information, and other miscellaneous conference information. This may in some cases also include the cover art, table of contents, copyright statements, title-page or half title-pages, blank pages, venue maps or other general information relating to the conference that was part of the original...
The heterogeneity of client devices is increasing leading to different resolutions, qualities and form factors. Due to the amount of multimedia to be processed, transcoding and protection can be no longer performed linearly. For that reason, this article describes a solution to distribute and parallelize the transcoding process as well as the content encryption relying on cloud computing. Moreover,...
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...
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...
Privacy is close to the user information and thus, present in any ubiquitous computing scenario. In this sense, privacy in identity management is gaining more importance, since IdM systems deal with services that requires sharing attributes belonging to users' identity with different entities across security domains. However, the effective revocation consent -considered as a privacy rule in sensitive...
Long Term Evolution (LTE) technology is considered as the most possible candidate for next generation mobile communications. LTE networks offer high capacity and are specified and designed to accommodate small, high performance, power-efficient end-user devices. One limiting factor that influences LTE performance is the interference from neighbor cells, the so called Inter-Cell Interference (ICI)...
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...
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...
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...
Multimodal human-computer interaction combining multiple input modalities is the key for permitting our highly skilled and coordinated communicative behavior to control computer systems in flexible and natural manner. In this paper a multimodal interaction platform, called Manitou, is presented. The platform empowers researchers and developers to employ speech, gestures and other modalities in applications,...
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...
In this article, a fully distributed mechanism of Physical Cell Identifier (PCI) assignment within LTE-A networks, where there are more than 504 femtocells deployed under one macrocell, is analysed. We propose a technique that can assign collision-free PCIs and work out any confusion event that may occur in the macrocell. Simulation results based on implementation of the algorithm proposed are presented...
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...
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...
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...
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...
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