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Mobile fading channel simulators based on ergodic sum-of-cisoids (SOC) processes have been proposed in several papers as a solution to accurately approximate the channel's autocorrelation function (ACF) in a single simulation run. However, despite the encouraging results presented in the literature, it is not clear whether the ergodicity of this type of simulators is meaningful in practice, where...
Over the top services such as video telephony or IPTV are nowadays offered in mobile networks. The mobile users, however, expect not only service connectivity, but also demand on service quality. To meet user expectations and optimize the multimedia streaming, operators have to make a trade-off between service quality and the resources allocated for the service offering. However, due to the subjective...
A Process Network (PN) is an ideal model for streaming-based multimedia and signal-processing applications because of unbounded channel capacities. Mechanisms to implement this model have been proposed but deadlock problems appear. In this paper, we introduce an algorithm with O(n) complexity to solve artificial deadlocks, even when modifications to the evolution of the computation in the PN are considered...
The effect of a mobile jammer on wideband code division multiple access (WCDMA) networks is influenced by radio network loading. A model of the WCDMA access control algorithm was developed and used to investigate network performance under jamming and various loading conditions. Jamming effectiveness was found to become less predictable as the load was increased. Increased loading levels were also...
In this paper, we consider a two-way cognitive relay network comprising two sources and multiple relays. The relays use a simple Amplify-and-Forward relaying mechanism. For such networks, we formulate the max-min and sum capacity optimization problems. The formulated optimization problems are non-convex and nonlinear in nature. We obtain the optimal solution of the optimization problems by using a...
The paper presents an algorithm for on-line estimation of the intra- and inter-cell interference in the enhanced uplink (EUL) of the wideband code division multiple access (WCDMA) cellular system. The proposed Kalman filter estimator builds on measurements of the total wideband power of the WCDMA uplink, in combination with measurements of the powers of the dedicated physical control channels (DPCCH)...
Powermesh MAC protocol is a relatively simple protocol designed for applications that mostly have a regular schedule of data transport activities such as routine status reports of a monitored power system. In particular, this protocol is designed for sensor network nodes that tend to be arranged in an approximately linear configuration, such as along the power lines. The Powermesh MAC protocol is...
The active contour framework is widely used for segmentation of images. Specially active contours with a convex energy gained a lot of interest, since they are independent of initialization. Several methods have been proposed to minimise the active contour energy, all claiming to be fast and efficient. In this paper we study and compare the convergence and constraints of these methods. We also propose...
This paper presents new algorithms for generation of generalized radio maps for fingerprinting positioning in the long term evolution (LTE) cellular system. The algorithms use collected high precision positions of opportunity tagged with measured radio properties like cell ID (CID), received signal strengths (RSS), timing advance (TA) and angle of arrival (AoA) information. The high precision positions...
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