Ancuta Moldovan

Study of co-channel cross-layer interference for the downlink communication in femtocell networks

The paper is concerned with the study of the co-channel cross-layer interference which appears in evolved mobile networks, in which femtocell access points (FAPs) have been deployed. We will investigate the levels of interference for the downlink communication channel, in two cases: macrocell base station (MacroBS) interference at the femtocell user (FUE), and FAP interference at the macrocell user (MUE). The simulations are carried out in a combined indoor-outdoor environment. The performances of the network are evaluated according to the signal to interference plus noise ratio, measured on the downlink communication channel. The results of the study reveal the impact of the deployment of femtocells in existing mobile networks.

An Innovative QoS Paradigm Based on Cognitive In-network Management of Resources for a Future Unified Network Architecture: I-NAME QoS Model

The goal of this paper is to present an innovative QoS solution of managing resources by knowing the service requests and the network context in a unified network architecture. Considering the nowadays technical solutions and the holistic vision of the future network of information, this solution is proposing a cognitive QoS model of self-managing resources by using the network virtualization concept in conjunction with the in-network management concept. Thus, the main goal of the paper is to solve resource management problem inside a unified network architecture remodeled by the actual trends in the field – virtualization and in-network management – by validating while evaluating the I-NAME QoS proposed model.

Cross correlation function of wideband MIMO channels: derivation and analysis

In this paper, we propose a space-time-frequency cross-correlation function (CCF) for multiple-input multiple-output (MIMO) multicarrier channels in a two-dimensional (2D) random scattering outdoor medium. The MIMO channel is considered to be wideband. In our mathematical model CCF is calculated taking into account the clustering phenomenon, frequency selectivity and antenna characteristics. Because in outdoor environments the scatterers are distributed non-uniformly we consider the radio channel as being non-isotropic.