Soumaya Hamouda

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In this paper, we investigate resource management in downlink multi-cell Orthogonal Frequency Division Multiple Access (OFDMA) systems. An efficient and low-complexity subcarrier assignment algorithm as well as power control scheme are proposed to mitigate the co-channel interference (CCI) impact. Based on a new centralized reuse partitioning strategy, our(More)
Fractional Frequency Reuse (FFR) is gaining much attention in WiMAX standardization bodies to mitigate the inter-cell interference and reduce the throughput outage at the cell edges. A hard FFR pattern based on a time division of the available total bandwidth between inner and outer cell users is recommended in the IEEE 802.16e standard. The DL subframe is(More)
FemtoCells' deployment presents a major challenge. In fact, these femto-base stations are often seen as hostile interferers by macroCells. Therefore, the optimization of the radio resource allocation to femtoCells is essential to decrease the interference in the network and provide a better QoS for both femtoCell and macroCell users. In this paper, we(More)
The next generation of radio wireless networks is expected to support spectrum decision operations that will allow a cognitive radio terminal to share the frequency bandwidth with primary users without impairing their QoS requirements. This can indeed enhance the utilization of the limited spectrum resources, and help meet the growing bandwidth demand. In(More)
The development of mobile communication services has lead to the increase the use of wireless spectrum. However, the persuasion of the overly crowded spectrum is not due to the scarcity of usable radio frequencies but to the current static spectrum management policy. This reveals many idle frequency bands in both time and space. The cognitive radio network(More)
Relaying technology is likely to bring real progress to the next generation cellular networks due to its capability of boosting the system capacity and coverage. However, despite recent advances in relay deployment, some challenging problems still remain such as radio resource allocation and relay selection. The authors investigate both relay selection and(More)
In this paper, we propose a new dynamic frequency assignment scheme for femtoCells in OFDMA networks. The femtoCell base stations are small cellular base stations specially designed to improve the poor indoor coverage and increase the system capacity for cellular and wireless broadband networks. However, these femto-base stations cause harmful interference(More)