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Abstract—Hierarchical cell structure (HCS) is considered as a possible solution to support users in shadowing area or hot zone area. In HCS systems, both co-channel interference and mobility management are the most important problems. In this paper, we propose a new mobility management method that efficiently preserves the data rate of the mobile user passing small overlaid cell area. In the proposed...
Coexistence of more than one wireless communication systems in a shared band such as 2.4 GHz ISM band has been one of hot research topics. As an example, there are many research results related to the coexistence of Wi-Fi and Bluetooth systems in the ISM band. Recently, many schemes for coexistence of Wi-Fi and WiMAX systems in shared bands such as 2.4 GHz ISM band have been proposed. In this paper,...
Performance of a collocated system containing WiMax and Wi-Fi systems in a single device is analyzed for two cases: collaborative and non-collaborative. In order to reduce the mutual interference between Wi-Fi and WiMAX system in the collocated system, a circulator-based collocated system is proposed and its performance is analyzed with simulation.
Femto BS (base station) is emerging as a key technology to secure the coverage and capacity in indoor environments. However, since the existing macrocell network is overlaid on femtocell networks utilizing the same set of frequency channels, femtocell networks can originate severe co-channel interference to the macrocell network unless the femtocell network is carefully configured. Therefore, according...
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