Amila P. K. Tharaperiya Gamage

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—Efficiency of the wireless local area network (WLAN)/femtocell interworking system essentially relies on the efficiency of the resource allocation protocol employed in the system. Efficiency of the resource allocation protocol depends on whether it has been designed considering physical layer and medium access control layer technologies of different(More)
—In this paper, we investigate uplink resource allocation for wireless local area network and cellular network inter-working to provide multi-homing voice and data services. The problem is formulated based on the physical layer and medium access control layer technologies of the two networks to ensure that the resource allocation decisions are feasible and(More)
—Co-channel interference (CCI) is a major issue faced by efficient co-channel deployed orthogonal frequency division multiple access (OFDMA) based two-tier femtocell systems. There are several resource allocation mechanisms proposed, such as, [1]–[4], to address this issue. However, none of these methods have considered employing relays in order to reduce(More)
—In this paper, energy efficient uplink communications are investigated for battery-constrained mobile terminals (MTs) with service quality requirements and multi-homing capabilities. A heterogeneous wireless medium is considered, where MTs communicate with base stations (BSs) and access points (APs) of different networks with overlapped coverage. Different(More)
—Inter carrier interference (ICI) is deemed as a critical issue in orthogonal frequency division multiple access (OFDMA) systems. Though ICI caused by Doppler spread is negligible in femtocell systems, frequent reception of signals over misaligned subcarriers will introduce severe ICI. Successive interference cancellation and decision feedback equalizers(More)
To satisfy the ever-increasing wireless service demand, it is effective to form a converged network by utilizing interworking mechanisms, such that the resources of heterogeneous wireless networks can be allocated in a coordinated and efficient manner. Despite the potential advantages of a converged network, its performance needs further improvement,(More)
—Relaying in femtocell networks is a promising and economically viable option to reduce the co-channel interference while improving indoor coverage and the network capacity in the next generation wireless networks. However, efficient relay selection as well as subcarrier and power allocation are critical in such networks when multiple users and multiple(More)