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Spectrum trading is an important aspect of television white space (TVWS) and it is driven by the failure of spectrum sensing techniques. In spectrum trading, the primary users lease their unoccupied spectrum to the secondary users for a market fee. Although spectrum trading is considered as a reliable approach, it is confronted with a spectrum transaction completion time problem, which negatively...
Network densification is seen as a necessary trend in the evolution toward 5G networks to cope with future high-traffic demands. In particular, the use of femtocells seems to be the most feasible solution for hotspot areas where high traffic is concentrated. However, femtocell densification will face a number of technical challenges. Among others, the co-tier interference arises as an old acquaintance...
Cognitive radio (CR) has been proposed to solve the problem of spectrum under utilisation by opportunistically accessing unutilised bands. In this research, the problem of resource allocation in OFDM-CR networks has been examined. The main objective of this study, is to provide better control management for the interference to the primary user (PU) while maintain low complexity to the proposed algorithm...
The importance of small cells deployments in cellular systems are becoming more apparent days after days since the benefits in terms of number of users that can be supported, the offered bandwidth and power consumption are obviously enormous as the wireless networks continue to get more congested. In this paper, a number of well-known scheduling schemes namely, Round Robin (RR), Proportional Fairness...
Network MIMO is a feasible technique that can significantly improve the performance of wireless communication systems by canceling the Inter-cell Interference (ICI). Dynamic Fractional Frequency Reuse (DFFR) is the technique to mitigate ICI in LTE-Advanced system, which improve throughput and capacity, especially for the cell-edge users (CEUs). Recent research has shown that the impact of DFFR scheme...
Cognitive Radios have been proposed as a novel technology to improve the spectrum utilization in wireless transmissions. In self-organized network such ad-hoc cognitive radio networks (AHCRNs), the resource allocation (e.g., power, and channel) rise up several challenges due to rapid utilization of the available spectrum. In this paper, we consider noncooperative game theory to solve the power allocation...
One of the efficient ways to transmit high data rate in a wireless network is by employing a multiple antenna transmission scheme, known as the multiple-input multiple-output (MIMO). One of the MIMO schemes, known as Spatial Multiplexing (SM) relies on the linear independence data streams from different transmit antennas to exploit the channel capacity. Consequently, SM suffers considerably from the...
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