LTE networks are becoming more and more popular nowadays. There are two main problems in implementing LTE networks coverage and capacity. Both these problems can be solved by deploying femtocells in LTE networks. Interference occurs between newly added femtocell and pre existing macrocell as macrocell and femtocell share same frequency band. Macrocell-femtocell interference management is bigges...

Fractional Frequency Reuse is an interference mitigation technique well suited for OFDMA system where the cell region is partitioned into two: inner cell region and outer cell region. In this paper we proposed an interference mitigation technique in LTE OFDMA femtocell system using Fractional Frequency Reuse (FFR) also system in order to improve performance of the system resource allocation is ...

The current fixed spectrum allocation scheme leads to significant spectrum white spaces. It requires a more effective spectrum allocation and utilization policy, which allows unused parts of spectrum to become available temporarily for commercial purposes so that the scarcity of the spectrum can be largely mitigated. This paper is an early attempt to study such wireless networks with opportunis...

In this paper, based on the analyzed emerging challenges encountered by the future radio network, we focus on several candidate techniques targeting at a more spectrum-efficient and cost-effective solution. Among them, spectrum management is one special topic covering fields of technique, regulation and politics. We point out the high tendency of spectrum liberation in terms of spectrum allocat...

As a preliminary to the studies conducted by the individual Working Groups, a review has been undertaken of topics which are relevant to the space-weather phenomena that can occur. The ways in general that these can influence the state of the ionosphere are discussed. The various changes in propagation parameters that arise on Earth-space and terrestrial radio paths via the ionosphere are liste...

Radio spectrum is a scarce resource and its demand is growing rapidly to meet high data rate end user demands. Current static frequency allocation leads to insufficient usage of limited spectrum resources and urges the regulatory bodies to review their policy and inquire communication technologies that can exploit spectrum in a more flexible and intelligent fashion. For example, spectrum occupa...

The radio spectrum is a limited resource shared by various types of services, for some of which the allocation of frequencies was decided several decades ago. Since, then, a drastic progress has been accomplished in technology. As a consequence, a much more efficient use of the frequency spectrum can be contemplated. SDR techniques seem to have considerable potential in solving today’s disarray...